mirror of
https://github.com/ganelson/inform.git
synced 2024-07-02 23:14:57 +03:00
1141 lines
40 KiB
C
Executable file
1141 lines
40 KiB
C
Executable file
/* ------------------------------------------------------------------------- */
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/* "linker" : For compiling and linking modules */
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/* */
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/* Part of Inform 6.34 */
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/* copyright (c) Graham Nelson 1993 - 2020 */
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/* */
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/* ------------------------------------------------------------------------- */
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#include "header.h"
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memory_block link_data_area;
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uchar *link_data_holding_area, *link_data_top;
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/* Start, current top, size of */
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int32 link_data_size; /* link data table being written */
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/* (holding import/export names) */
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extern int32 *action_symbol;
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/* ------------------------------------------------------------------------- */
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/* Marker values */
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/* ------------------------------------------------------------------------- */
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extern char *describe_mv(int mval)
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{ switch(mval)
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{ case NULL_MV: return("null");
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/* Marker values used in ordinary story file backpatching */
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case DWORD_MV: return("dictionary word");
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case STRING_MV: return("string literal");
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case INCON_MV: return("system constant");
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case IROUTINE_MV: return("routine");
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case VROUTINE_MV: return("veneer routine");
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case ARRAY_MV: return("internal array");
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case NO_OBJS_MV: return("the number of objects");
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case INHERIT_MV: return("inherited common p value");
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case INDIVPT_MV: return("indiv prop table address");
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case INHERIT_INDIV_MV: return("inherited indiv p value");
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case MAIN_MV: return("ref to Main");
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case SYMBOL_MV: return("ref to symbol value");
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/* Additional marker values used in module backpatching */
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case VARIABLE_MV: return("global variable");
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case IDENT_MV: return("prop identifier number");
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case ACTION_MV: return("action");
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case OBJECT_MV: return("internal object");
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/* Record types in the import/export table (not really marker
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values at all) */
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case EXPORT_MV: return("Export ");
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case EXPORTSF_MV: return("Export sf");
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case EXPORTAC_MV: return("Export ##");
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case IMPORT_MV: return("Import ");
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}
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return("** No such MV **");
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}
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/* ------------------------------------------------------------------------- */
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/* Import/export records */
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/* ------------------------------------------------------------------------- */
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typedef struct importexport_s
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{ int module_value;
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int32 symbol_number;
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char symbol_type;
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int backpatch;
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int32 symbol_value;
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char *symbol_name;
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} ImportExport;
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static void describe_importexport(ImportExport *I)
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{ printf("%8s %20s %04d %04x %s\n",
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describe_mv(I->module_value), I->symbol_name,
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I->symbol_number, I->symbol_value, typename(I->symbol_type));
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}
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/* ========================================================================= */
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/* Linking in external modules: this code is run when the external */
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/* program hits a Link directive. */
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/* ------------------------------------------------------------------------- */
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/* This map is between global variable numbers in the module and in the */
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/* external program: variables_map[n] will be the external global variable */
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/* no for module global variable no n. (The entries [0] to [15] are not */
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/* used.) */
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/* ------------------------------------------------------------------------- */
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static int variables_map[256], actions_map[256];
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int32 module_map[16];
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ImportExport IE;
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/* ------------------------------------------------------------------------- */
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/* These are offsets within the module: */
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/* ------------------------------------------------------------------------- */
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static int32 m_code_offset, m_strs_offset, m_static_offset, m_dict_offset,
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m_vars_offset, m_objs_offset, m_props_offset, m_class_numbers,
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m_individuals_offset, m_individuals_length;
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static int m_no_objects, m_no_globals, p_no_globals, lowest_imported_global_no;
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int32 *xref_table; int xref_top;
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int32 *property_identifier_map;
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int *accession_numbers_map;
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int32 routine_replace[64],
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routine_replace_with[64]; int no_rr;
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/* ------------------------------------------------------------------------- */
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/* Reading and writing bytes/words in the module (as loaded in), indexing */
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/* via "marker addresses". */
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/* ------------------------------------------------------------------------- */
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static int32 read_marker_address(uchar *p, int size,
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int zmachine_area, int32 offset)
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{
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/* A routine to read the value referred to by the marker address
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(zmachine_area, offset): size is 1 for byte, 2 for word, and the
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module itself resides at p. */
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int32 addr = 0;
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switch(zmachine_area)
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{
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case DYNAMIC_ARRAY_ZA:
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addr = m_vars_offset; break;
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case ZCODE_ZA:
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addr = m_code_offset; break;
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case STATIC_STRINGS_ZA:
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addr = m_strs_offset; break;
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case DICTIONARY_ZA:
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addr = m_dict_offset; break;
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case OBJECT_TREE_ZA:
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addr = m_objs_offset; break;
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case PROP_ZA:
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addr = m_props_offset; break;
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case INDIVIDUAL_PROP_ZA:
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addr = m_individuals_offset; break;
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}
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if (size == 1) return p[addr+offset];
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return 256*p[addr+offset] + p[addr+offset+1];
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}
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static void write_marker_address(uchar *p, int size,
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int zmachine_area, int32 offset, int32 value)
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{
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/* Similar, but to write to it. */
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int32 addr = 0;
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switch(zmachine_area)
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{
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case DYNAMIC_ARRAY_ZA:
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addr = m_vars_offset; break;
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case ZCODE_ZA:
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addr = m_code_offset; break;
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case STATIC_STRINGS_ZA:
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addr = m_strs_offset; break;
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case DICTIONARY_ZA:
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addr = m_dict_offset; break;
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case OBJECT_TREE_ZA:
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addr = m_objs_offset; break;
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case PROP_ZA:
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addr = m_props_offset; break;
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case INDIVIDUAL_PROP_ZA:
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addr = m_individuals_offset; break;
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}
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if (size == 1) { p[addr+offset] = value%256; return; }
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p[addr+offset] = value/256;
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p[addr+offset+1] = value%256;
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}
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int m_read_pos;
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static int get_next_record(uchar *p)
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{ int i;
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int record_type = p[m_read_pos++];
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switch(record_type)
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{ case 0: break;
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case EXPORT_MV:
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case EXPORTSF_MV:
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case EXPORTAC_MV:
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case IMPORT_MV:
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IE.module_value = record_type;
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i=p[m_read_pos++]; IE.symbol_number = 256*i + p[m_read_pos++];
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IE.symbol_type = p[m_read_pos++];
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if (record_type != IMPORT_MV) IE.backpatch = p[m_read_pos++];
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i=p[m_read_pos++]; IE.symbol_value = 256*i + p[m_read_pos++];
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IE.symbol_name = (char *) (p+m_read_pos);
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m_read_pos += strlen((char *) (p+m_read_pos))+1;
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if (linker_trace_level >= 2) describe_importexport(&IE);
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break;
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default:
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printf("Marker value of %d\n", record_type);
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compiler_error("Link: illegal import/export marker value");
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return -1;
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}
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return record_type;
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}
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static char link_errorm[128];
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static void accept_export(void)
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{ int32 index, map_to = IE.symbol_value % 0x10000;
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index = symbol_index(IE.symbol_name, -1);
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xref_table[IE.symbol_number] = index;
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if (!(sflags[index] & UNKNOWN_SFLAG))
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{ if (IE.module_value == EXPORTAC_MV)
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{ if ((!(sflags[index] & ACTION_SFLAG))
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&& (stypes[index] != FAKE_ACTION_T))
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link_error_named(
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"action name clash with", IE.symbol_name);
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}
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else
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if (stypes[index] == IE.symbol_type)
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{ switch(IE.symbol_type)
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{ case CONSTANT_T:
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if ((!(svals[index] == IE.symbol_value))
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|| (IE.backpatch != 0))
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link_error_named(
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"program and module give differing values of", IE.symbol_name);
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break;
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case INDIVIDUAL_PROPERTY_T:
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property_identifier_map[IE.symbol_value] = svals[index];
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break;
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case ROUTINE_T:
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if ((IE.module_value == EXPORTSF_MV)
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&& (sflags[index] & REPLACE_SFLAG))
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break;
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default:
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sprintf(link_errorm,
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"%s '%s' in both program and module",
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typename(IE.symbol_type), IE.symbol_name);
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link_error(link_errorm);
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break;
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}
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}
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else
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{ sprintf(link_errorm,
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"'%s' has type %s in program but type %s in module",
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IE.symbol_name, typename(stypes[index]),
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typename(IE.symbol_type));
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link_error(link_errorm);
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}
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}
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else
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{ if (IE.module_value == EXPORTAC_MV)
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{ IE.symbol_value = no_actions;
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action_symbol[no_actions++] = index;
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if (linker_trace_level >= 4)
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printf("Creating action ##%s\n", (char *) symbs[index]);
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}
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else
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switch(IE.symbol_type)
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{ case ROUTINE_T:
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if ((IE.module_value == EXPORTSF_MV)
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&& (sflags[index] & REPLACE_SFLAG))
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{ routine_replace[no_rr] = IE.symbol_value;
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routine_replace_with[no_rr++] = index;
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return;
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}
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IE.symbol_value += (zmachine_pc/scale_factor);
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break;
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case OBJECT_T:
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case CLASS_T:
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IE.symbol_value += no_objects;
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break;
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case ARRAY_T:
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IE.symbol_value += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
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break;
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case GLOBAL_VARIABLE_T:
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if (no_globals==233)
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{ link_error(
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"failed because too many extra global variables needed");
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return;
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}
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variables_map[16 + m_no_globals++] = 16 + no_globals;
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set_variable_value(no_globals, IE.symbol_value);
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IE.symbol_value = 16 + no_globals++;
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break;
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case INDIVIDUAL_PROPERTY_T:
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property_identifier_map[IE.symbol_value]
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= no_individual_properties;
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IE.symbol_value = no_individual_properties++;
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if (debugfile_switch)
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{ debug_file_printf("<property>");
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debug_file_printf
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("<identifier>%s</identifier>", IE.symbol_name);
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debug_file_printf
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("<value>%d</value>", IE.symbol_value);
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debug_file_printf("</property>");
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}
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break;
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}
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assign_symbol(index, IE.backpatch*0x10000 + IE.symbol_value,
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IE.symbol_type);
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if (IE.backpatch != 0) sflags[index] |= CHANGE_SFLAG;
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sflags[index] |= EXPORT_SFLAG;
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if (IE.module_value == EXPORTSF_MV)
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sflags[index] |= INSF_SFLAG;
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if (IE.module_value == EXPORTAC_MV)
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sflags[index] |= ACTION_SFLAG;
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}
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if (IE.module_value == EXPORTAC_MV)
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{ if (linker_trace_level >= 4)
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printf("Map %d '%s' to %d\n",
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IE.symbol_value, (char *) (symbs[index]), svals[index]);
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actions_map[map_to] = svals[index];
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}
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}
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static void accept_import(void)
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{ int32 index;
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index = symbol_index(IE.symbol_name, -1);
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sflags[index] |= USED_SFLAG;
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xref_table[IE.symbol_number] = index;
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if (!(sflags[index] & UNKNOWN_SFLAG))
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{ switch (IE.symbol_type)
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{
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case GLOBAL_VARIABLE_T:
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if (stypes[index] != GLOBAL_VARIABLE_T)
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link_error_named(
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"module (wrongly) declared this a variable:", IE.symbol_name);
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variables_map[IE.symbol_value] = svals[index];
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if (IE.symbol_value < lowest_imported_global_no)
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lowest_imported_global_no = IE.symbol_value;
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break;
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default:
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switch(stypes[index])
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{ case ATTRIBUTE_T:
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link_error_named(
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"this attribute is undeclared within module:", IE.symbol_name);; break;
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case PROPERTY_T:
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link_error_named(
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"this property is undeclared within module:", IE.symbol_name); break;
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case INDIVIDUAL_PROPERTY_T:
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case ARRAY_T:
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case ROUTINE_T:
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case CONSTANT_T:
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case OBJECT_T:
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case CLASS_T:
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case FAKE_ACTION_T:
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break;
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default:
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link_error_named(
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"this was referred to as a constant, but isn't:", IE.symbol_name);
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break;
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}
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break;
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}
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}
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else
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{ switch (IE.symbol_type)
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{
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case GLOBAL_VARIABLE_T:
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if (stypes[index] != GLOBAL_VARIABLE_T)
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link_error_named(
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"Module tried to import a Global variable not defined here:",
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IE.symbol_name);
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variables_map[IE.symbol_value] = 16;
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if (IE.symbol_value < lowest_imported_global_no)
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lowest_imported_global_no = IE.symbol_value;
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break;
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}
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}
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}
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static int32 backpatch_backpatch(int32 v)
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{ switch(backpatch_marker)
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{
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/* Backpatches made now which are final */
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case OBJECT_MV:
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v += no_objects;
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backpatch_marker = NULL_MV;
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break;
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case ACTION_MV:
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if ((v<0) || (v>=256) || (actions_map[v] == -1))
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{ link_error("unmapped action number");
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printf("*** Link: unmapped action number %d ***", v);
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v = 0;
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break;
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}
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v = actions_map[v];
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backpatch_marker = NULL_MV;
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break;
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case IDENT_MV:
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{ int f = v & 0x8000;
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v = f + property_identifier_map[v-f];
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backpatch_marker = NULL_MV;
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break;
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}
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case VARIABLE_MV:
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backpatch_marker = NULL_MV;
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if (v < lowest_imported_global_no)
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{ v = v + p_no_globals; break;
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}
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if (variables_map[v] == -1)
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{ printf("** Unmapped variable %d! **\n", v);
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variables_map[v] = 16;
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link_error("unmapped variable error"); break;
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}
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v = variables_map[v];
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break;
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/* Backpatch values which are themselves being backpatched */
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case INDIVPT_MV:
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v += individuals_length;
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break;
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case SYMBOL_MV:
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v = xref_table[v];
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if ((v<0) || (v>=no_symbols))
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{ printf("** Symbol number %d cannot be crossreferenced **\n", v);
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link_error("symbol crossreference error"); v=0;
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break;
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}
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break;
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case STRING_MV:
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v += static_strings_extent/scale_factor;
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break;
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case IROUTINE_MV:
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{ int i;
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for (i=0;i<no_rr;i++)
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if (v == routine_replace[i])
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{ v = routine_replace_with[i];
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backpatch_marker = SYMBOL_MV;
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goto IR_Done;
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}
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v += zmachine_pc/scale_factor;
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}
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IR_Done: break;
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case VROUTINE_MV:
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veneer_routine(v);
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break;
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|
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case ARRAY_MV:
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if (v < (MAX_GLOBAL_VARIABLES*2))
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{ v = 2*(variables_map[v/2 + 16] - 16);
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}
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else
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{ v += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
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}
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break;
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case DWORD_MV:
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v = accession_numbers_map[v];
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break;
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|
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case INHERIT_MV:
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v += properties_table_size;
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break;
|
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case INHERIT_INDIV_MV:
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v += individuals_length;
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break;
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}
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return v;
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}
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static void backpatch_module_image(uchar *p,
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int marker_value, int zmachine_area, int32 offset)
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|
{ int size = (marker_value>=0x80)?1:2; int32 v;
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marker_value &= 0x7f;
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backpatch_marker = marker_value;
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if (zmachine_area == PROP_DEFAULTS_ZA) return;
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if (linker_trace_level >= 3)
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printf("Backpatch %s area %d offset %04x size %d: ",
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describe_mv(marker_value), zmachine_area, offset, size);
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v = read_marker_address(p, size, zmachine_area, offset);
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if (linker_trace_level >= 3) printf("%04x ", v);
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v = backpatch_backpatch(v);
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write_marker_address(p, size, zmachine_area, offset, v);
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if (linker_trace_level >= 3) printf("%04x\n", v);
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}
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|
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/* ------------------------------------------------------------------------- */
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/* The main routine: linking in a module with the given filename. */
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/* ------------------------------------------------------------------------- */
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|
|
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char current_module_filename[128];
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|
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void link_module(char *given_filename)
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{ FILE *fin;
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int record_type;
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char filename[128];
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uchar *p, p0[64];
|
|
int32 last, i, j, k, l, m, vn, len, size, link_offset, module_size, map,
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|
max_property_identifier, symbols_base = no_symbols;
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strcpy(current_module_filename, given_filename);
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|
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/* (1) Load in the module to link */
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i = 0;
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do
|
|
{ i = translate_link_filename(i, filename, given_filename);
|
|
fin=fopen(filename,"rb");
|
|
} while ((fin == NULL) && (i != 0));
|
|
|
|
if (fin==NULL)
|
|
{ error_named("Couldn't open module file", filename); return;
|
|
}
|
|
|
|
for (i=0;i<64;i++) p0[i]=fgetc(fin);
|
|
|
|
vn = p0[0];
|
|
if ((vn<65) || (vn>75))
|
|
{ error_named("File isn't a module:", filename);
|
|
fclose(fin); return;
|
|
}
|
|
|
|
if (vn != 64 + version_number)
|
|
{ char ebuff[100];
|
|
sprintf(ebuff,
|
|
"module compiled as Version %d (so it can't link\
|
|
into this V%d game):", vn-64, version_number);
|
|
error_named(ebuff, filename);
|
|
fclose(fin); return;
|
|
}
|
|
|
|
module_size = (256*p0[26] + p0[27])*scale_factor;
|
|
p = my_malloc(module_size + 16, "link module storage");
|
|
/* The + 16 allows for rounding errors */
|
|
|
|
for (k=0;k<64;k++) p[k] = p0[k];
|
|
for (k=64;k<module_size;k++) p[k] = fgetc(fin);
|
|
fclose(fin);
|
|
|
|
if ((p0[52] != 0) || (p0[53] != 0))
|
|
{ /* Then the module contains a character set table */
|
|
if (alphabet_modified)
|
|
{ k = FALSE; m = 256*p0[52] + p0[53];
|
|
for (i=0;i<3;i++) for (j=0;j<26;j++)
|
|
{ l = alphabet[i][j]; if (l == '~') l = '\"';
|
|
if (l != p[m]) k = TRUE;
|
|
}
|
|
if (k)
|
|
link_error("module and game both define non-standard character sets, \
|
|
but they disagree");
|
|
k = FALSE;
|
|
}
|
|
else k = TRUE;
|
|
}
|
|
else
|
|
{ if (alphabet_modified) k = TRUE;
|
|
else k = FALSE;
|
|
}
|
|
if (k)
|
|
link_error("module and game use different character sets");
|
|
|
|
i = p[1];
|
|
if (i > MODULE_VERSION_NUMBER)
|
|
warning_named("module has a more advanced format than this release \
|
|
of the Inform 6 compiler knows about: it may not link in correctly", filename);
|
|
|
|
/* (2) Calculate offsets: see the header-writing code in "tables.c" */
|
|
|
|
map = (256*p[6] + p[7]);
|
|
for (i=0; i<16; i++) module_map[i] = 256*p[map + i*2] + p[map + i*2 + 1];
|
|
|
|
m_vars_offset = (256*p[12] + p[13]);
|
|
m_static_offset = (256*p[14] + p[15]);
|
|
m_dict_offset = (256*p[8] + p[9]);
|
|
m_code_offset = (256*p[4] + p[5]);
|
|
|
|
/* (3) Read the "module map" table */
|
|
|
|
if (linker_trace_level>=4)
|
|
{ printf("[Reading module map:\n");
|
|
for (i=0; i<16; i++) printf("%04x ", module_map[i]);
|
|
printf("]\n");
|
|
}
|
|
|
|
m_objs_offset = module_map[0];
|
|
m_props_offset = module_map[1];
|
|
m_strs_offset = scale_factor*module_map[2];
|
|
m_class_numbers = module_map[3];
|
|
m_individuals_offset = module_map[4];
|
|
m_individuals_length = module_map[5];
|
|
|
|
for (i=16;i<256;i++) variables_map[i] = -1;
|
|
for (i=0;i<16;i++) variables_map[i] = i;
|
|
for (i=LOWEST_SYSTEM_VAR_NUMBER;i<256;i++) variables_map[i] = i;
|
|
|
|
for (i=0;i<256;i++) actions_map[i] = -1;
|
|
|
|
xref_table = my_calloc(sizeof(int32), module_map[6],
|
|
"linker cross-references table");
|
|
for (i=0;i<module_map[6];i++) xref_table[i] = -1;
|
|
|
|
max_property_identifier = module_map[7];
|
|
property_identifier_map = my_calloc(sizeof(int32), max_property_identifier,
|
|
"property identifier map");
|
|
for (i=0; i<max_property_identifier; i++)
|
|
property_identifier_map[i] = i;
|
|
|
|
m_no_objects = module_map[8];
|
|
link_offset = module_map[9];
|
|
|
|
m_no_globals = 0; p_no_globals = no_globals;
|
|
lowest_imported_global_no=236;
|
|
|
|
no_rr = 0;
|
|
|
|
if ((linker_trace_level>=1) || transcript_switch)
|
|
{ char link_banner[128];
|
|
sprintf(link_banner,
|
|
"[Linking release %d.%c%c%c%c%c%c of module '%s' (size %dK)]",
|
|
p[2]*256 + p[3], p[18], p[19], p[20], p[21], p[22], p[23],
|
|
filename, module_size/1024);
|
|
if (linker_trace_level >= 1) printf("%s\n", link_banner);
|
|
if (transcript_switch)
|
|
write_to_transcript_file(link_banner);
|
|
}
|
|
|
|
/* (4) Merge in the dictionary */
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Merging module's dictionary at %04x\n", m_dict_offset);
|
|
k=m_dict_offset; k+=p[k]+1;
|
|
len=p[k++];
|
|
size = p[k]*256 + p[k+1]; k+=2;
|
|
|
|
accession_numbers_map = my_calloc(sizeof(int), size,
|
|
"dictionary accession numbers map");
|
|
|
|
for (i=0;i<size;i++, k+=len)
|
|
{ char word[10];
|
|
word_to_ascii(p+k,word);
|
|
if (linker_trace_level >= 3)
|
|
printf("%03d %04x '%s' %02x %02x %02x\n",i,k,
|
|
word, p[k+len-3], p[k+len-2], p[k+len-1]);
|
|
|
|
accession_numbers_map[i]
|
|
= dictionary_add(word, p[k+len-3], p[k+len-2], p[k+len-1]);
|
|
}
|
|
|
|
/* (5) Run through import/export table */
|
|
|
|
m_read_pos = module_map[9];
|
|
if (linker_trace_level>=2)
|
|
printf("Import/export table is at byte offset %04x\n", m_read_pos);
|
|
|
|
do
|
|
{ record_type = get_next_record(p);
|
|
if (((record_type == EXPORT_MV) || (record_type == EXPORTSF_MV))
|
|
&& (IE.symbol_type == INDIVIDUAL_PROPERTY_T))
|
|
{ int32 si = symbol_index(IE.symbol_name, -1);
|
|
property_identifier_map[IE.symbol_value] = svals[si];
|
|
}
|
|
switch(record_type)
|
|
{ case EXPORT_MV:
|
|
case EXPORTSF_MV:
|
|
case EXPORTAC_MV:
|
|
accept_export(); break;
|
|
case IMPORT_MV:
|
|
accept_import(); break;
|
|
}
|
|
} while (record_type != 0);
|
|
|
|
if ((linker_trace_level >= 4) && (no_rr != 0))
|
|
{ printf("Replaced routine addresses:\n");
|
|
for (i=0; i<no_rr; i++)
|
|
{ printf("Replace code offset %04x with %04x\n",
|
|
routine_replace[i], routine_replace_with[i]);
|
|
}
|
|
}
|
|
|
|
if (linker_trace_level >= 4)
|
|
{ printf("Symbol cross-references table:\n");
|
|
for (i=0; i<module_map[6]; i++)
|
|
{ if (xref_table[i] != -1)
|
|
printf("module %4d -> story file '%s'\n", i,
|
|
(char *) symbs[xref_table[i]]);
|
|
}
|
|
}
|
|
|
|
if (linker_trace_level >= 4)
|
|
{ printf("Action numbers map:\n");
|
|
for (i=0; i<256; i++)
|
|
if (actions_map[i] != -1)
|
|
printf("%3d -> %3d\n", i, actions_map[i]);
|
|
}
|
|
|
|
if ((linker_trace_level >= 4) && (max_property_identifier > 72))
|
|
{ printf("Property identifier number map:\n");
|
|
for (i=72; i<max_property_identifier; i++)
|
|
{ printf("module %04x -> program %04x\n",
|
|
i, property_identifier_map[i]);
|
|
}
|
|
}
|
|
|
|
/* (6) Backpatch the backpatch markers attached to exported symbols */
|
|
|
|
for (i=symbols_base; i<no_symbols; i++)
|
|
{ if ((sflags[i] & CHANGE_SFLAG) && (sflags[i] & EXPORT_SFLAG))
|
|
{ backpatch_marker = svals[i]/0x10000;
|
|
j = svals[i] % 0x10000;
|
|
|
|
j = backpatch_backpatch(j);
|
|
|
|
svals[i] = backpatch_marker*0x10000 + j;
|
|
if (backpatch_marker == 0) sflags[i] &= (~(CHANGE_SFLAG));
|
|
}
|
|
}
|
|
|
|
/* (7) Run through the Z-code backpatch table */
|
|
|
|
for (i=module_map[11]; i<module_map[11]+module_map[12]; i += 3)
|
|
{ int marker_value = p[i];
|
|
int32 offset = 256*p[i+1] + p[i+2];
|
|
|
|
switch(marker_value & 0x7f)
|
|
{ case OBJECT_MV:
|
|
case ACTION_MV:
|
|
case IDENT_MV:
|
|
case VARIABLE_MV:
|
|
backpatch_module_image(p, marker_value, ZCODE_ZA, offset);
|
|
break;
|
|
default:
|
|
backpatch_module_image(p, marker_value, ZCODE_ZA, offset);
|
|
write_byte_to_memory_block(&zcode_backpatch_table,
|
|
zcode_backpatch_size++, backpatch_marker);
|
|
write_byte_to_memory_block(&zcode_backpatch_table,
|
|
zcode_backpatch_size++, (offset + zmachine_pc)/256);
|
|
write_byte_to_memory_block(&zcode_backpatch_table,
|
|
zcode_backpatch_size++, (offset + zmachine_pc)%256);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* (8) Run through the Z-machine backpatch table */
|
|
|
|
for (i=module_map[13]; i<module_map[13]+module_map[14]; i += 4)
|
|
{ int marker_value = p[i], zmachine_area = p[i+1];
|
|
int32 offset = 256*p[i+2] + p[i+3];
|
|
|
|
switch(marker_value)
|
|
{ case OBJECT_MV:
|
|
case ACTION_MV:
|
|
case IDENT_MV:
|
|
backpatch_module_image(p, marker_value, zmachine_area, offset);
|
|
break;
|
|
default:
|
|
backpatch_module_image(p, marker_value, zmachine_area, offset);
|
|
switch(zmachine_area)
|
|
{ case PROP_DEFAULTS_ZA:
|
|
break;
|
|
case PROP_ZA:
|
|
offset += properties_table_size; break;
|
|
case INDIVIDUAL_PROP_ZA:
|
|
offset += individuals_length; break;
|
|
case DYNAMIC_ARRAY_ZA:
|
|
if (offset < (MAX_GLOBAL_VARIABLES*2))
|
|
{ offset = 2*(variables_map[offset/2 + 16] - 16);
|
|
}
|
|
else
|
|
{ offset += dynamic_array_area_size - (MAX_GLOBAL_VARIABLES*2);
|
|
}
|
|
break;
|
|
}
|
|
backpatch_zmachine(backpatch_marker, zmachine_area, offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* (9) Adjust initial values of variables */
|
|
|
|
if (linker_trace_level >= 3)
|
|
printf("\nFinal variables map, Module -> Main:\n");
|
|
|
|
for (i=16;i<255;i++)
|
|
if (variables_map[i]!=-1)
|
|
{ if (linker_trace_level>=2)
|
|
printf("%d->%d ",i,variables_map[i]);
|
|
if (i<lowest_imported_global_no)
|
|
{ int32 j = read_marker_address(p, 2,
|
|
DYNAMIC_ARRAY_ZA, 2*(i-16));
|
|
set_variable_value(variables_map[i]-16, j);
|
|
if (linker_trace_level>=2)
|
|
printf("(set var %d to %d) ",
|
|
variables_map[i], j);
|
|
}
|
|
}
|
|
if (linker_trace_level>=2) printf("\n");
|
|
|
|
/* (10) Glue in the dynamic array data */
|
|
|
|
i = m_static_offset - m_vars_offset - MAX_GLOBAL_VARIABLES*2;
|
|
if (dynamic_array_area_size + i >= MAX_STATIC_DATA)
|
|
memoryerror("MAX_STATIC_DATA", MAX_STATIC_DATA);
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Inserting dynamic array area, %04x to %04x, at %04x\n",
|
|
m_vars_offset + MAX_GLOBAL_VARIABLES*2, m_static_offset,
|
|
variables_offset + dynamic_array_area_size);
|
|
for (k=0;k<i;k++)
|
|
{ dynamic_array_area[dynamic_array_area_size+k]
|
|
= p[m_vars_offset+MAX_GLOBAL_VARIABLES*2+k];
|
|
}
|
|
dynamic_array_area_size+=i;
|
|
|
|
/* (11) Glue in the code area */
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Inserting code area, %04x to %04x, at code offset %04x (+%04x)\n",
|
|
m_code_offset, m_strs_offset, code_offset, zmachine_pc);
|
|
|
|
for (k=m_code_offset;k<m_strs_offset;k++)
|
|
{ if (temporary_files_switch)
|
|
{ fputc(p[k],Temp2_fp);
|
|
zmachine_pc++;
|
|
}
|
|
else
|
|
write_byte_to_memory_block(&zcode_area, zmachine_pc++, p[k]);
|
|
}
|
|
|
|
/* (12) Glue in the static strings area */
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Inserting strings area, %04x to %04x, \
|
|
at strings offset %04x (+%04x)\n",
|
|
m_strs_offset, link_offset, strings_offset,
|
|
static_strings_extent);
|
|
for (k=m_strs_offset;k<link_offset;k++)
|
|
{ if (temporary_files_switch)
|
|
{ fputc(p[k], Temp1_fp);
|
|
static_strings_extent++;
|
|
}
|
|
else
|
|
write_byte_to_memory_block(&static_strings_area,
|
|
static_strings_extent++, p[k]);
|
|
}
|
|
|
|
/* (13) Append the class object-numbers table: note that modules
|
|
provide extra information in this table */
|
|
|
|
i = m_class_numbers;
|
|
do
|
|
{ j = p[i]*256 + p[i+1]; i+=2;
|
|
if (j == 0) break;
|
|
|
|
class_object_numbers[no_classes] = j + no_objects;
|
|
j = p[i]*256 + p[i+1]; i+=2;
|
|
class_begins_at[no_classes++] = j + properties_table_size;
|
|
|
|
} while (TRUE);
|
|
|
|
/* (14) Glue on the object tree */
|
|
|
|
if ((linker_trace_level>=2) && (m_no_objects>0))
|
|
printf("Joining on object tree of size %d\n", m_no_objects);
|
|
|
|
for (i=0, k=no_objects, last=m_props_offset;i<m_no_objects;i++)
|
|
{ objectsz[no_objects].atts[0]=p[m_objs_offset+14*i];
|
|
objectsz[no_objects].atts[1]=p[m_objs_offset+14*i+1];
|
|
objectsz[no_objects].atts[2]=p[m_objs_offset+14*i+2];
|
|
objectsz[no_objects].atts[3]=p[m_objs_offset+14*i+3];
|
|
objectsz[no_objects].atts[4]=p[m_objs_offset+14*i+4];
|
|
objectsz[no_objects].atts[5]=p[m_objs_offset+14*i+5];
|
|
objectsz[no_objects].parent =
|
|
(p[m_objs_offset+14*i+6])*256+p[m_objs_offset+14*i+7];
|
|
objectsz[no_objects].next =
|
|
(p[m_objs_offset+14*i+8])*256+p[m_objs_offset+14*i+9];
|
|
objectsz[no_objects].child =
|
|
(p[m_objs_offset+14*i+10])*256+p[m_objs_offset+14*i+11];
|
|
if (linker_trace_level>=4)
|
|
printf("Module objects[%d] has %d,%d,%d\n",
|
|
i,objectsz[no_objects].parent,
|
|
objectsz[no_objects].next,objectsz[no_objects].child);
|
|
if (objectsz[no_objects].parent == 0x7fff)
|
|
{ objectsz[no_objects].parent = 1;
|
|
if (objectsz[1].child == 0)
|
|
{ objectsz[1].child = no_objects+1;
|
|
}
|
|
else
|
|
{ int j1 = 0, j2 = objectsz[1].child;
|
|
while (j2 != 0)
|
|
{ j1 = j2;
|
|
j2 = objectsz[j2].next;
|
|
}
|
|
objectsz[j1].next = no_objects+1;
|
|
}
|
|
objectsz[no_objects].next = 0;
|
|
}
|
|
else
|
|
if (objectsz[no_objects].parent>0) objectsz[no_objects].parent += k;
|
|
if (objectsz[no_objects].next>0) objectsz[no_objects].next += k;
|
|
if (objectsz[no_objects].child>0) objectsz[no_objects].child += k;
|
|
objectsz[no_objects].propsize =
|
|
(p[m_objs_offset+14*i+12])*256+p[m_objs_offset+14*i+13];
|
|
last += objectsz[no_objects].propsize;
|
|
if (linker_trace_level>=4)
|
|
printf("Objects[%d] has %d,%d,%d\n",
|
|
no_objects,objectsz[no_objects].parent,
|
|
objectsz[no_objects].next,objectsz[no_objects].child);
|
|
no_objects++;
|
|
}
|
|
|
|
/* (15) Glue on the properties */
|
|
|
|
if (last>m_props_offset)
|
|
{ i = m_static_offset - m_vars_offset - MAX_GLOBAL_VARIABLES*2;
|
|
if (dynamic_array_area_size + i >= MAX_STATIC_DATA)
|
|
memoryerror("MAX_STATIC_DATA", MAX_STATIC_DATA);
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Inserting object properties area, %04x to %04x, at +%04x\n",
|
|
m_props_offset, last, properties_table_size);
|
|
for (k=0;k<last-m_props_offset;k++)
|
|
properties_table[properties_table_size++] = p[m_props_offset+k];
|
|
}
|
|
|
|
/* (16) Bitwise OR Flags 2 (Z-machine requirements flags) */
|
|
|
|
j = p[16]*256 + p[17];
|
|
for (i=0, k=1;i<16;i++, k=k*2) flags2_requirements[i] |= ((j/k)%2);
|
|
|
|
/* (17) Append the individual property values table */
|
|
|
|
i = m_individuals_length;
|
|
if (individuals_length + i >= MAX_INDIV_PROP_TABLE_SIZE)
|
|
memoryerror("MAX_INDIV_PROP_TABLE_SIZE",
|
|
MAX_INDIV_PROP_TABLE_SIZE);
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Inserting individual prop tables area, %04x to %04x, at +%04x\n",
|
|
m_individuals_offset, m_individuals_offset + i,
|
|
individuals_length);
|
|
for (k=0;k<i;k++)
|
|
{ individuals_table[individuals_length + k]
|
|
= p[m_individuals_offset + k];
|
|
}
|
|
individuals_length += i;
|
|
|
|
/* (18) All done */
|
|
|
|
if (linker_trace_level >= 2)
|
|
printf("Link complete\n");
|
|
|
|
my_free(&p, "link module storage");
|
|
my_free(&xref_table, "linker cross-references table");
|
|
my_free(&property_identifier_map, "property identifier map");
|
|
my_free(&accession_numbers_map, "accession numbers map");
|
|
}
|
|
|
|
/* ========================================================================= */
|
|
/* Writing imports, exports and markers to the link data table during */
|
|
/* module compilation */
|
|
/* ------------------------------------------------------------------------- */
|
|
/* Writing to the link data table */
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static void write_link_byte(int x)
|
|
{ *link_data_top=(unsigned char) x; link_data_top++; link_data_size++;
|
|
if (subtract_pointers(link_data_top,link_data_holding_area)
|
|
>= MAX_LINK_DATA_SIZE)
|
|
{ memoryerror("MAX_LINK_DATA_SIZE",MAX_LINK_DATA_SIZE);
|
|
}
|
|
}
|
|
|
|
extern void flush_link_data(void)
|
|
{ int32 i, j;
|
|
j = subtract_pointers(link_data_top, link_data_holding_area);
|
|
if (temporary_files_switch)
|
|
for (i=0;i<j;i++) fputc(link_data_holding_area[i], Temp3_fp);
|
|
else
|
|
for (i=0;i<j;i++)
|
|
write_byte_to_memory_block(&link_data_area, link_data_size-j+i,
|
|
link_data_holding_area[i]);
|
|
link_data_top=link_data_holding_area;
|
|
}
|
|
|
|
static void write_link_word(int32 x)
|
|
{ write_link_byte(x/256); write_link_byte(x%256);
|
|
}
|
|
|
|
static void write_link_string(char *s)
|
|
{ int i;
|
|
for (i=0; s[i]!=0; i++) write_link_byte(s[i]);
|
|
write_link_byte(0);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
/* Exports and imports */
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static void export_symbols(void)
|
|
{ int symbol_number;
|
|
|
|
for (symbol_number = 0; symbol_number < no_symbols; symbol_number++)
|
|
{ int export_flag = FALSE, import_flag = FALSE;
|
|
|
|
if (stypes[symbol_number]==GLOBAL_VARIABLE_T)
|
|
{ if (svals[symbol_number] < LOWEST_SYSTEM_VAR_NUMBER)
|
|
{ if (sflags[symbol_number] & IMPORT_SFLAG)
|
|
import_flag = TRUE;
|
|
else
|
|
if (!(sflags[symbol_number] & SYSTEM_SFLAG))
|
|
export_flag = TRUE;
|
|
}
|
|
}
|
|
else
|
|
{ if (!(sflags[symbol_number] & SYSTEM_SFLAG))
|
|
{ if (sflags[symbol_number] & UNKNOWN_SFLAG)
|
|
{ if (sflags[symbol_number] & IMPORT_SFLAG)
|
|
import_flag = TRUE;
|
|
}
|
|
else
|
|
switch(stypes[symbol_number])
|
|
{ case LABEL_T:
|
|
case ATTRIBUTE_T:
|
|
case PROPERTY_T:
|
|
/* Ephemera */
|
|
break;
|
|
|
|
default: export_flag = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (export_flag)
|
|
{ if (linker_trace_level >= 1)
|
|
{ IE.module_value = EXPORT_MV;
|
|
IE.symbol_number = symbol_number;
|
|
IE.symbol_type = stypes[symbol_number];
|
|
IE.symbol_value = svals[symbol_number];
|
|
IE.symbol_name = (char *) (symbs[symbol_number]);
|
|
describe_importexport(&IE);
|
|
}
|
|
|
|
if (sflags[symbol_number] & ACTION_SFLAG)
|
|
write_link_byte(EXPORTAC_MV);
|
|
else
|
|
if (sflags[symbol_number] & INSF_SFLAG)
|
|
write_link_byte(EXPORTSF_MV);
|
|
else
|
|
write_link_byte(EXPORT_MV);
|
|
|
|
write_link_word(symbol_number);
|
|
write_link_byte(stypes[symbol_number]);
|
|
if (sflags[symbol_number] & CHANGE_SFLAG)
|
|
write_link_byte(svals[symbol_number] / 0x10000);
|
|
else write_link_byte(0);
|
|
write_link_word(svals[symbol_number] % 0x10000);
|
|
write_link_string((char *) (symbs[symbol_number]));
|
|
flush_link_data();
|
|
}
|
|
|
|
if (import_flag)
|
|
{ if (linker_trace_level >= 1)
|
|
{ IE.module_value = IMPORT_MV;
|
|
IE.symbol_number = symbol_number;
|
|
IE.symbol_type = stypes[symbol_number];
|
|
IE.symbol_value = svals[symbol_number];
|
|
IE.symbol_name = (char *) (symbs[symbol_number]);
|
|
describe_importexport(&IE);
|
|
}
|
|
|
|
write_link_byte(IMPORT_MV);
|
|
write_link_word(symbol_number);
|
|
write_link_byte(stypes[symbol_number]);
|
|
write_link_word(svals[symbol_number]);
|
|
write_link_string((char *) (symbs[symbol_number]));
|
|
flush_link_data();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
/* Marking for later importation */
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
int mv_vref=LOWEST_SYSTEM_VAR_NUMBER-1;
|
|
|
|
void import_symbol(int32 symbol_number)
|
|
{ sflags[symbol_number] |= IMPORT_SFLAG;
|
|
switch(stypes[symbol_number])
|
|
{ case GLOBAL_VARIABLE_T:
|
|
assign_symbol(symbol_number, mv_vref--, stypes[symbol_number]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* ========================================================================= */
|
|
/* Data structure management routines */
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
extern void init_linker_vars(void)
|
|
{ link_data_size = 0;
|
|
initialise_memory_block(&link_data_area);
|
|
}
|
|
|
|
extern void linker_begin_pass(void)
|
|
{ link_data_top = link_data_holding_area;
|
|
}
|
|
|
|
extern void linker_endpass(void)
|
|
{ export_symbols();
|
|
write_link_byte(0);
|
|
flush_link_data();
|
|
}
|
|
|
|
extern void linker_allocate_arrays(void)
|
|
{ if (!module_switch)
|
|
link_data_holding_area
|
|
= my_malloc(64, "link data holding area");
|
|
else
|
|
link_data_holding_area
|
|
= my_malloc(MAX_LINK_DATA_SIZE, "link data holding area");
|
|
}
|
|
|
|
extern void linker_free_arrays(void)
|
|
{ my_free(&link_data_holding_area, "link data holding area");
|
|
deallocate_memory_block(&link_data_area);
|
|
}
|
|
|
|
/* ========================================================================= */
|