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<!--Weave of 'C Memory Model' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#5">Chapter 5: C</a></li><li><b>C Memory Model</b></li></ul></div>
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<p class="purpose">How arrays of all kinds are stored in C.</p>
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<ul class="toc"><li><a href="5-cmm.html#SP1">§1. Setting up the model</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Setting up the model. </b>The Inter semantics require that there be an area of byte-accessible memory:
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</p>
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<ul class="items"><li>(a) Byte-accessible memory must contain all of the arrays. These can but need
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not have alignment gaps in between them. (For C, they do not.)
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</li><li>(b) "Addresses" in this memory identify individual byte positions in it. These
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can but need not start at 0. (For C, they do.) They must not be too large to
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fit into an Inter value.
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</li><li>(c) When an array name is compiled, its runtime value must be its address.
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</li><li>(d) When an Inter value is stored in byte-accessible memory, it occupies either
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2 or 4 consecutive bytes, with the little end first. The result is called a
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"word". (For C, always 4, which is always <span class="extract"><span class="extract-syntax">sizeof(i7word_t)</span></span>.) Conversion between
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a word stored in memory and an Inter value must be faithful in both directions.
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</li><li>(e) Words can be stored at any byte position, and not only at (say) multiples
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of 2 or 4.
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</li><li>(f) Arrays in memory are free to contain a mixture of bytes and words: some do.
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</li><li>(g) Data may be written in byte form and read back in word form, or vice versa.
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</li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::initialise</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::initialise</span></span>:<br/>Final C - <a href="5-fnc.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">WORD_TO_BYTE_MTID</span><span class="plain-syntax">, </span><a href="5-cmm.html#SP11" class="function-link"><span class="function-syntax">CMemoryModel::word_to_byte</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">BEGIN_ARRAY_MTID</span><span class="plain-syntax">, </span><a href="5-cmm.html#SP4" class="function-link"><span class="function-syntax">CMemoryModel::begin_array</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">ARRAY_ENTRY_MTID</span><span class="plain-syntax">, </span><a href="5-cmm.html#SP5" class="function-link"><span class="function-syntax">CMemoryModel::array_entry</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">END_ARRAY_MTID</span><span class="plain-syntax">, </span><a href="5-cmm.html#SP6" class="function-link"><span class="function-syntax">CMemoryModel::end_array</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">C_generation_memory_model_data</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">himem</span><span class="plain-syntax">; </span><span class="comment-syntax"> 1 more than the largest legal byte address</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">array_name</span><span class="plain-syntax">; </span><span class="comment-syntax"> of the array currently being compiled</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">entry_count</span><span class="plain-syntax">; </span><span class="comment-syntax"> within the array currently being compiled</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">C_generation_memory_model_data</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::initialise_data</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::initialise_data</span></span>:<br/>Final C - <a href="5-fnc.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">) = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">array_name</span><span class="plain-syntax">) = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">entry_count</span><span class="plain-syntax">) = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>The structure C_generation_memory_model_data is accessed in 5/com and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>For a given process <span class="extract"><span class="extract-syntax">proc</span></span>, the current contents of byte-addressable memory will
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be an array called <span class="extract"><span class="extract-syntax">proc->state.memory</span></span>; here, we will compile a single static array
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<span class="extract"><span class="extract-syntax">i7_initial_memory</span></span> holding the initial contents of this memory, so that a new
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process can be initialised from that.
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</p>
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<p class="commentary">The first 64 bytes of memory are reserved for the "header". We don't write those
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here, and instead blank them out to all 0s.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::begin</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::begin</span></span>:<br/>Final C - <a href="5-fnc.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_memory_array_I7CGS</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"i7byte_t i7_initial_memory[] = {\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><64; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"0, "</span><span class="plain-syntax">); </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"/* header */\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">) += </span><span class="constant-syntax">64</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>And we must close that array declaration, too:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::end</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::end</span></span>:<br/>Final C - <a href="5-fnc.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_memory_array_I7CGS</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"};\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_ids_and_maxima_I7CGS</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define i7_static_himem %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>What goes into memory are arrays: memory is allocated only in the form of
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such arrays, which are declared one at a time. See <a href="2-vc.html" class="internal">Vanilla Constants</a>.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::begin_array</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::begin_array</span></span>:<br/><a href="5-cmm.html#SP1">§1</a><br/>C Object Model - <a href="5-com.html#SP25_1">§25.1</a>, <a href="5-com.html#SP25_2">§25.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">array_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">array_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">format</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">zero_count</span><span class="plain-syntax">, </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> *</span><span class="identifier-syntax">saved</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">array_name</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">array_name</span><span class="plain-syntax">), </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">array_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">entry_count</span><span class="plain-syntax">) = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ConstantInstruction::list_format</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) == </span><span class="identifier-syntax">CONST_LIST_FORMAT_GRAMMAR</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Short-circuit the usual Vanilla algorithm by compiling the whole array now</span><span class="named-paragraph-number">4.1</span></a></span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Declare this array in concert with the usual Vanilla algorithm</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>§4.1. </b>Command-grammar arrays are handled differently: note the return value <span class="extract"><span class="extract-syntax">FALSE</span></span>,
|
|
which tells Vanilla not to call us again about this array.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Short-circuit the usual Vanilla algorithm by compiling the whole array now</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">saved</span><span class="plain-syntax">) *</span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_verb_arrays_I7CGS</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-vi.html#SP8" class="function-link"><span class="function-syntax">VanillaIF::verb_grammar</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">array_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>§4.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Declare this array in concert with the usual Vanilla algorithm</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">saved</span><span class="plain-syntax">) *</span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_arrays_I7CGS</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"unknown"</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP4_2_1" class="named-paragraph-link"><span class="named-paragraph">Work out the format name</span><span class="named-paragraph-number">4.2.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP4_2_2" class="named-paragraph-link"><span class="named-paragraph">Define a constant for the byte address in memory where the array begins</span><span class="named-paragraph-number">4.2.2</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">format</span><span class="plain-syntax"> == </span><span class="constant-syntax">TABLE_ARRAY_FORMAT</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">format</span><span class="plain-syntax"> == </span><span class="constant-syntax">BUFFER_ARRAY_FORMAT</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP4_2_3" class="named-paragraph-link"><span class="named-paragraph">Place the extent entry N at index 0</span><span class="named-paragraph-number">4.2.3</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">zero_count</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><a href="5-cmm.html#SP5" class="function-link"><span class="function-syntax">CMemoryModel::array_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"0"</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP4">§4</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2_1" class="paragraph-anchor"></a><b>§4.2.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Work out the format name</span><span class="named-paragraph-number">4.2.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">format</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">BYTE_ARRAY_FORMAT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"byte"</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">WORD_ARRAY_FORMAT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"word"</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">BUFFER_ARRAY_FORMAT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"buffer"</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">TABLE_ARRAY_FORMAT:</span><span class="plain-syntax"> </span><span class="identifier-syntax">format_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">I</span><span class="string-syntax">"table"</span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2_2" class="paragraph-anchor"></a><b>§4.2.2. </b>Crucially, the array names are <span class="extract"><span class="extract-syntax">#define</span></span> constants declared up near the top
|
|
of the source code: they are not variables with pointer types, or something
|
|
like that. This means they can legally be used as values elsewhere in memory,
|
|
or as initial values of variables, and so on.
|
|
</p>
|
|
|
|
<p class="commentary">Object, class and function names can also legally appear as array entries,
|
|
because they too are defined constants, equal to their IDs: see <a href="5-com.html" class="internal">C Object Model</a>.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Define a constant for the byte address in memory where the array begins</span><span class="named-paragraph-number">4.2.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_predeclarations_I7CGS</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define "</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="5-cnm.html#SP3" class="function-link"><span class="function-syntax">CNamespace::mangle</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">array_name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" %d /* = position in memory of %S array %S */\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">), </span><span class="identifier-syntax">format_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">array_name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">array_s</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">SymbolAnnotation::set_i</span><span class="plain-syntax">(</span><span class="identifier-syntax">array_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_ARRAY_ADDRESS_IANN</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax">) </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4_2_3" class="paragraph-anchor"></a><b>§4.2.3. </b>Of course, right now we don't know <span class="extract"><span class="extract-syntax">N</span></span>, the extent of the array. So we will
|
|
refer to this with a constant like <span class="extract"><span class="extract-syntax">i7_mgl_myarray__xt</span></span> (XT meaning "extent"),
|
|
which we will retrospectively predefine when the array ends.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Place the extent entry N at index 0</span><span class="named-paragraph-number">4.2.3</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">extname</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><a href="5-cnm.html#SP3" class="function-link"><span class="function-syntax">CNamespace::mangle</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">extname</span><span class="plain-syntax">, </span><span class="identifier-syntax">array_name</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">extname</span><span class="plain-syntax">, </span><span class="string-syntax">"__xt"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="5-cmm.html#SP5" class="function-link"><span class="function-syntax">CMemoryModel::array_entry</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">extname</span><span class="plain-syntax">, </span><span class="identifier-syntax">format</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">extname</span><span class="plain-syntax">)</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP4_2">§4.2</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>The call to <a href="5-cmm.html#SP4" class="internal">CMemoryModel::begin_array</a> is then followed by a series of calls to:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::array_entry</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::array_entry</span></span>:<br/><a href="5-cmm.html#SP1">§1</a>, <a href="5-cmm.html#SP4_2">§4.2</a>, <a href="5-cmm.html#SP4_2_3">§4.2.3</a><br/>C Object Model - <a href="5-com.html#SP24">§24</a>, <a href="5-com.html#SP25_1">§25.1</a>, <a href="5-com.html#SP25_2">§25.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">format</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_memory_array_I7CGS</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">format</span><span class="plain-syntax"> == </span><span class="constant-syntax">TABLE_ARRAY_FORMAT</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">format</span><span class="plain-syntax"> == </span><span class="constant-syntax">WORD_ARRAY_FORMAT</span><span class="plain-syntax">))</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP5_2" class="named-paragraph-link"><span class="named-paragraph">This is a word entry</span><span class="named-paragraph-number">5.2</span></a></span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cmm.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">This is a byte entry</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">entry_count</span><span class="plain-syntax">)++;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_1" class="paragraph-anchor"></a><b>§5.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">This is a byte entry</span><span class="named-paragraph-number">5.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" (i7byte_t) %S, /* %d */\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">) += </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP5_2" class="paragraph-anchor"></a><b>§5.2. </b>Note that <span class="extract"><span class="extract-syntax">I7BYTE_0</span></span> and so on are macros and not functions (see below): they
|
|
use only arithmetic operations which can be constant-folded by the C compiler,
|
|
and therefore if <span class="extract"><span class="extract-syntax">X</span></span> is a valid constant-context expression in C then so is
|
|
<span class="extract"><span class="extract-syntax">I7BYTE_0(X)</span></span>.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">This is a word entry</span><span class="named-paragraph-number">5.2</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" I7BYTE_0(%S), I7BYTE_1(%S), I7BYTE_2(%S), I7BYTE_3(%S), /* %d */\n"</span><span class="plain-syntax">,</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">entry</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">himem</span><span class="plain-syntax">) += </span><span class="constant-syntax">4</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cmm.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>When all the entries have been placed, the following is called. It does nothing
|
|
except to predeclare the extent constant.
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::end_array</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::end_array</span></span>:<br/><a href="5-cmm.html#SP1">§1</a><br/>C Object Model - <a href="5-com.html#SP25_1">§25.1</a>, <a href="5-com.html#SP25_2">§25.2</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">format</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">zero_count</span><span class="plain-syntax">, </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> *</span><span class="identifier-syntax">saved</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">x_saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">c_predeclarations_I7CGS</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define "</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="5-cnm.html#SP3" class="function-link"><span class="function-syntax">CNamespace::mangle</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">array_name</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"__xt %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">memdata</span><span class="plain-syntax">.</span><span class="element-syntax">entry_count</span><span class="plain-syntax">)-1);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">x_saved</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">saved</span><span class="plain-syntax">) </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, *</span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>The primitives for byte and word lookup have the signatures:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax">primitive !lookup val val -> val</span>
|
|
<span class="plain-syntax">primitive !lookupbyte val val -> val</span>
|
|
</pre>
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::handle_store_by_ref</span><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">ref</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ReferenceInstruction::node_is_ref_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">ref</span><span class="plain-syntax">, </span><span class="identifier-syntax">LOOKUP_BIP</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">ReferenceInstruction::node_is_ref_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">ref</span><span class="plain-syntax">, </span><span class="identifier-syntax">LOOKUPBYTE_BIP</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::invoke_primitive</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::invoke_primitive</span></span>:<br/>C Program Control - <a href="5-cpc.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">bip</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">bip</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOOKUP_BIP:</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"i7_read_word(proc, "</span><span class="plain-syntax">); </span><span class="constant-syntax">VNODE_1C</span><span class="plain-syntax">; </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", "</span><span class="plain-syntax">); </span><span class="constant-syntax">VNODE_2C</span><span class="plain-syntax">; </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">")"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">LOOKUPBYTE_BIP:</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"i7_read_byte(proc, "</span><span class="plain-syntax">); </span><span class="constant-syntax">VNODE_1C</span><span class="plain-syntax">; </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" + "</span><span class="plain-syntax">); </span><span class="constant-syntax">VNODE_2C</span><span class="plain-syntax">; </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">")"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>So, then, time to write some more of the C library. We are going to need to
|
|
define the macros <span class="extract"><span class="extract-syntax">I7BYTE_0</span></span> to <span class="extract"><span class="extract-syntax">I7BYTE_3</span></span>, and also the functions <span class="extract"><span class="extract-syntax">i7_read_word</span></span>
|
|
and <span class="extract"><span class="extract-syntax">i7_read_byte</span></span>, used just above. But we start with the function which resets
|
|
memory to its initial state when a process begins, and with the stack empty.
|
|
</p>
|
|
|
|
<p class="commentary">Note that we fill in ten bytes of the 64-byte header block of memory:
|
|
</p>
|
|
|
|
<ul class="items"><li>● The Release number as a big-endian 16-bit value at <span class="extract"><span class="extract-syntax">0x34-0x35</span></span>;
|
|
</li><li>● The Serial code as six ASCII characters (in practice digits) at <span class="extract"><span class="extract-syntax">0x36-0x3B</span></span>.
|
|
</li></ul>
|
|
<p class="commentary">We carefully defined those two constants, if they exist, before the inclusion point of
|
|
the C library in order that the conditional compilations in <span class="extract"><span class="extract-syntax">i7_initialise_memory_and_stack</span></span>
|
|
will work correctly. See <a href="5-cnm.html#SP7" class="internal">CNamespace::declare_constant</a>.
|
|
</p>
|
|
|
|
<p class="commentary">The rest of the header area remains all zeros.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">size_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">how_many</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">size_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">of_size</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_initialise_memory_and_stack</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">size_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">how_many</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">size_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">of_size</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">p</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">how_many</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">of_size</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">p</span><span class="Extracts-plain-syntax"> == </span><span class="Extracts-identifier-syntax">NULL</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Memory</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">allocation</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">failed</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">");</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">p</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_initial_memory</span><span class="Extracts-plain-syntax">[];</span>
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_initialise_memory_and_stack</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax"> != </span><span class="Extracts-identifier-syntax">NULL</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">);</span>
|
|
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">i7_initial_memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">ifdef</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_mgl_Release</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x34</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">I7BYTE_2</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7_mgl_Release</span><span class="Extracts-plain-syntax">); </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x35</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">I7BYTE_3</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7_mgl_Release</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">endif</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">ifndef</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_mgl_Release</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x34</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">I7BYTE_2</span><span class="Extracts-plain-syntax">(1); </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x35</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">I7BYTE_3</span><span class="Extracts-plain-syntax">(1);</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">endif</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">ifdef</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_mgl_Serial</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">char</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">p</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_text_to_C_string</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7_mgl_Serial</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><6; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x36</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">p</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">endif</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">ifndef</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_mgl_Serial</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><6; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">[0</span><span class="Extracts-identifier-syntax">x36</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = '0';</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">endif</span>
|
|
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">mem</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">himem</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b>The array <span class="extract"><span class="Extracts-extract-syntax">proc->state.memory</span></span> is of <span class="extract"><span class="Extracts-extract-syntax">i7byte_t</span></span> values, so it's easy to read
|
|
and write bytes. Words are more challenging since we need to pack and unpack them.
|
|
</p>
|
|
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<p class="commentary">The <span class="extract"><span class="Extracts-extract-syntax">i7_read_word</span></span> function reads a word which is in word entry <span class="extract"><span class="Extracts-extract-syntax">array_index</span></span> (counting
|
|
0, 1, 2, ...) in the array which begins at the byte address <span class="extract"><span class="Extracts-extract-syntax">array_address</span></span>.
|
|
</p>
|
|
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<p class="commentary">We can also read "short words", that is, 16-bit values.
|
|
</p>
|
|
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|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_sword</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_sword</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">2</span><span class="Extracts-plain-syntax">*</span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> ((</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) || (</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> >= </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">)) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Memory</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">access</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">out</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">of</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">range</span><span class="Extracts-plain-syntax">: %</span><span class="Extracts-identifier-syntax">d</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">", </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">] +</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x100</span><span class="Extracts-plain-syntax">*((</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">]);</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_read_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">4</span><span class="Extracts-plain-syntax">*</span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> ((</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) || (</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> >= </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">)) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Memory</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">access</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">out</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">of</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">range</span><span class="Extracts-plain-syntax">: %</span><span class="Extracts-identifier-syntax">d</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">", </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">3</span><span class="Extracts-plain-syntax">] +</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x100</span><span class="Extracts-plain-syntax">*((</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">2</span><span class="Extracts-plain-syntax">]) +</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x10000</span><span class="Extracts-plain-syntax">*((</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">]) +</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x1000000</span><span class="Extracts-plain-syntax">*((</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">]);</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP10" class="paragraph-anchor"></a><b>§10. </b>Writing values is again easy for bytes, but harder for words since they must
|
|
be broken up into bytes written in sequence.
|
|
</p>
|
|
|
|
<p class="commentary">Note that we make use of macros and not functions so that it is possible to
|
|
express the fragments of a packed word in constant context: this is essential
|
|
for our array initialisations.
|
|
</p>
|
|
|
|
<p class="commentary">Note that short words do not need to be written.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-plain-syntax">#</span><span class="Extracts-identifier-syntax">define</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">I7BYTE_0</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax">) ((</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax"> & </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">xFF000000</span><span class="Extracts-plain-syntax">) >> </span><span class="Extracts-constant-syntax">24</span><span class="Extracts-plain-syntax">)</span>
|
|
<span class="Extracts-plain-syntax">#</span><span class="Extracts-identifier-syntax">define</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">I7BYTE_1</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax">) ((</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax"> & </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x00FF0000</span><span class="Extracts-plain-syntax">) >> </span><span class="Extracts-constant-syntax">16</span><span class="Extracts-plain-syntax">)</span>
|
|
<span class="Extracts-plain-syntax">#</span><span class="Extracts-identifier-syntax">define</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">I7BYTE_2</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax">) ((</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax"> & </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x0000FF00</span><span class="Extracts-plain-syntax">) >> </span><span class="Extracts-constant-syntax">8</span><span class="Extracts-plain-syntax">)</span>
|
|
<span class="Extracts-plain-syntax">#</span><span class="Extracts-identifier-syntax">define</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">I7BYTE_3</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax">) (</span><span class="Extracts-identifier-syntax">V</span><span class="Extracts-plain-syntax"> & </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-identifier-syntax">x000000FF</span><span class="Extracts-plain-syntax">)</span>
|
|
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">,</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
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|
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|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">,</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">) {</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax"> + </span><span class="Extracts-constant-syntax">4</span><span class="Extracts-plain-syntax">*</span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> ((</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) || (</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax"> >= </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">)) {</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Memory</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">access</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">out</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">of</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">range</span><span class="Extracts-plain-syntax">: %</span><span class="Extracts-identifier-syntax">d</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">", </span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-plain-syntax"> }</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">I7BYTE_0</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">+1] = </span><span class="Extracts-identifier-syntax">I7BYTE_1</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">+2] = </span><span class="Extracts-identifier-syntax">I7BYTE_2</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">byte_position</span><span class="Extracts-plain-syntax">+3] = </span><span class="Extracts-identifier-syntax">I7BYTE_3</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-plain-syntax">}</span>
|
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</pre>
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<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
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<p class="commentary firstcommentary"><a id="SP11" class="paragraph-anchor"></a><b>§11. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CMemoryModel::word_to_byte</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">CMemoryModel::word_to_byte</span></span>:<br/><a href="5-cmm.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">b</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"I7BYTE_%d(%S)"</span><span class="plain-syntax">, </span><span class="identifier-syntax">b</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP12" class="paragraph-anchor"></a><b>§12. </b>The seven primitive operations on storage need to be implemented for byte
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and word lookups by the following pair of functions. Note that if <span class="extract"><span class="extract-syntax">way</span></span> is
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<span class="extract"><span class="extract-syntax">i7_lvalue_SET</span></span> then <span class="extract"><span class="extract-syntax">i7_change_byte</span></span> is equivalent to <span class="extract"><span class="extract-syntax">i7_write_byte</span></span> and
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<span class="extract"><span class="extract-syntax">i7_change_word</span></span> to <span class="extract"><span class="extract-syntax">i7_write_word</span></span>, except that they return the value as set.
|
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</p>
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<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_change_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_change_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">,</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_change_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">) {</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_read_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">switch</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_PREDEC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_POSTDEC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_PREINC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_POSTINC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_SETBIT</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> | </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_CLEARBIT</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> &(~</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">); </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_byte</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_change_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">,</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">data</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_read_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">switch</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">way</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_PREDEC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_POSTDEC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">-1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_PREINC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_POSTINC</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax">+1; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_SETBIT</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> | </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">case</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_lvalue_CLEARBIT</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">old_val</span><span class="Extracts-plain-syntax"> &(~</span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">); </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">break</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_write_word</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">array_address</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">array_index</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">new_val</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return_val</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP13" class="paragraph-anchor"></a><b>§13. </b>The stack is very simple; it can be pushed or pulled, but there's otherwise
|
|
no access to it.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_debug_stack</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">char</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">N</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_pull</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_push</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">x</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_debug_stack</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">char</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">N</span><span class="Extracts-plain-syntax">) {</span>
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|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">ifdef</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">I7_LOG_STACK_STATE</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Called</span><span class="Extracts-plain-syntax"> %</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">: </span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax"> %</span><span class="Extracts-identifier-syntax">d</span><span class="Extracts-plain-syntax"> ", </span><span class="Extracts-identifier-syntax">N</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">);</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++)</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("%</span><span class="Extracts-identifier-syntax">d</span><span class="Extracts-plain-syntax"> -> ", </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">]);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">");</span>
|
|
<span class="Extracts-plain-syntax"> #</span><span class="Extracts-identifier-syntax">endif</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
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|
<span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_pull</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax"> <= </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Stack</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">underflow</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">");</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax">[--(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">)];</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_push</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">x</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax"> >= </span><span class="Extracts-identifier-syntax">I7_ASM_STACK_CAPACITY</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Stack</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">overflow</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">");</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">++] = </span><span class="Extracts-identifier-syntax">x</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP14" class="paragraph-anchor"></a><b>§14. </b>When processes are running, they take periodic "snapshots" of their states
|
|
so that these can if necessary be returned to. (For IF works, this is how the
|
|
UNDO command works; snapshots are taken once each turn.)
|
|
</p>
|
|
|
|
<p class="commentary">Taking a snapshot, or restoring the state from an existing snapshot, inevitably
|
|
means making a copy of state data. This has to be a deep copy, because the
|
|
<span class="extract"><span class="Extracts-extract-syntax">i7state_t</span></span> structure is really just a collection of pointers to arrays in
|
|
memory; copying only the pointers would not be good enough.
|
|
</p>
|
|
|
|
<p class="commentary">For the same reason, an <span class="extract"><span class="Extracts-extract-syntax">i7state_t</span></span> cannot simply be discarded without causing
|
|
a memory leak, so we provide a destructor function.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_copy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_copy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">himem</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">himem</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7byte_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">i7_static_himem</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">I7_TMP_STORAGE_CAPACITY</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">tmp</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">tmp</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_parent</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_max_objects</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_child</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_max_objects</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_sibling</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_max_objects</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">));</span>
|
|
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">i7_max_objects</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_parent</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_parent</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_child</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_child</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_sibling</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_sibling</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> }</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_no_variables</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">i7_no_variables</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++) </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">to</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">current_output_stream_ID</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">from</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">current_output_stream_ID</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
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|
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<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7state_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">) {</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">memory</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">himem</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">stack_pointer</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">;</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_parent</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_child</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">object_tree_sibling</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">free</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">s</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP15" class="paragraph-anchor"></a><b>§15. </b>Destroying a snapshot is then a simple matter of destroying the state
|
|
stored inside it:
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7snapshot_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">unwanted</span><span class="Extracts-plain-syntax">);</span>
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_latest_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7snapshot_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">unwanted</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">unwanted</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">then</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">unwanted</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_latest_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">I7_MAX_SNAPSHOTS</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax">)</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">]));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP16" class="paragraph-anchor"></a><b>§16. </b>To take a snapshot, we copy the process's current state in the next free
|
|
slot in the ring buffer of snapshots held by the process; the net effect is
|
|
that it stores the most recent <span class="extract"><span class="Extracts-extract-syntax">I7_MAX_SNAPSHOTS</span></span> snapshots, silently discarding
|
|
any older ones, but without leaking memory.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_save_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_save_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax">)</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">]));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">i7_new_snapshot</span><span class="Extracts-plain-syntax">();</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_copy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">then</span><span class="Extracts-plain-syntax">), &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">was</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">++;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> == </span><span class="Extracts-identifier-syntax">I7_MAX_SNAPSHOTS</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP17" class="paragraph-anchor"></a><b>§17. </b>The function <span class="extract"><span class="Extracts-extract-syntax">i7_has_snapshot</span></span> tests whether the process has at least one
|
|
valid snapshot to revert to:
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_has_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_restore_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_restore_snapshot_from</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7snapshot_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">ss</span><span class="Extracts-plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
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<pre class="Extracts-displayed-code all-displayed-code code-font">
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<span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_has_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">I7_MAX_SNAPSHOTS</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">return</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax">;</span>
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<span class="Extracts-plain-syntax">}</span>
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</pre>
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<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
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<p class="commentary">And <span class="extract"><span class="Extracts-extract-syntax">i7_restore_snapshot</span></span> restores the state of the process to that of the
|
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most recent snapshot, winding backwards through the ring buffer, so that it's
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then possible to restore again to go back another step, and so on:
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</p>
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<pre class="Extracts-displayed-code all-displayed-code code-font">
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<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_restore_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
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|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> < </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">I7_MAX_SNAPSHOTS</span><span class="Extracts-plain-syntax"> - </span><span class="Extracts-constant-syntax">1</span><span class="Extracts-plain-syntax">;</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">if</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">valid</span><span class="Extracts-plain-syntax"> == </span><span class="Extracts-constant-syntax">0</span><span class="Extracts-plain-syntax">) {</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">printf</span><span class="Extracts-plain-syntax">("</span><span class="Extracts-identifier-syntax">Restore</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">impossible</span><span class="Extracts-plain-syntax">\</span><span class="Extracts-identifier-syntax">n</span><span class="Extracts-plain-syntax">");</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_fatal_exit</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
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<span class="Extracts-plain-syntax"> }</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">));</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_copy_state</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">), &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">].</span><span class="Extracts-identifier-syntax">then</span><span class="Extracts-plain-syntax">));</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_destroy_snapshot</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, &(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshots</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">]));</span>
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<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">was</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">snapshot_pos</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">will_be</span><span class="Extracts-plain-syntax">;</span>
|
|
<span class="Extracts-plain-syntax">}</span>
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</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
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