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inform7/inter/bytecode-module/Chapter 4/The Constant Construct.w
Graham Nelson 49964c7d52 Furthered the abstraction of inter_pair
2022-02-24 23:53:40 +00:00

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[Inter::Constant::] The Constant Construct.
Defining the constant construct.
@
@e CONSTANT_IST
=
void Inter::Constant::define(void) {
inter_construct *IC = InterConstruct::create_construct(CONSTANT_IST, I"constant");
InterConstruct::defines_symbol_in_fields(IC, DEFN_CONST_IFLD, KIND_CONST_IFLD);
InterConstruct::specify_syntax(IC, I"constant TOKENS = TOKENS");
InterConstruct::fix_instruction_length_between(IC, 4, UNLIMITED_INSTRUCTION_FRAME_LENGTH);
InterConstruct::permit(IC, INSIDE_PLAIN_PACKAGE_ICUP);
METHOD_ADD(IC, CONSTRUCT_READ_MTID, Inter::Constant::read);
METHOD_ADD(IC, CONSTRUCT_TRANSPOSE_MTID, Inter::Constant::transpose);
METHOD_ADD(IC, CONSTRUCT_VERIFY_MTID, Inter::Constant::verify);
METHOD_ADD(IC, CONSTRUCT_WRITE_MTID, Inter::Constant::write);
}
@
@d DEFN_CONST_IFLD 2
@d KIND_CONST_IFLD 3
@d FORMAT_CONST_IFLD 4
@d DATA_CONST_IFLD 5
@d CONSTANT_DIRECT 0
@d CONSTANT_INDIRECT_LIST 1
@d CONSTANT_SUM_LIST 2
@d CONSTANT_PRODUCT_LIST 3
@d CONSTANT_DIFFERENCE_LIST 4
@d CONSTANT_QUOTIENT_LIST 5
@d CONSTANT_INDIRECT_TEXT 6
@d CONSTANT_ROUTINE 7
@d CONSTANT_STRUCT 8
@d CONSTANT_TABLE 9
=
void Inter::Constant::read(inter_construct *IC, inter_bookmark *IBM, inter_line_parse *ilp, inter_error_location *eloc, inter_error_message **E) {
*E = InterConstruct::check_level_in_package(IBM, CONSTANT_IST, ilp->indent_level, eloc);
if (*E) return;
text_stream *kind_text = NULL, *name_text = ilp->mr.exp[0];
match_results mr3 = Regexp::create_mr();
if (Regexp::match(&mr3, name_text, L"%((%c+)%) (%c+)")) {
kind_text = mr3.exp[0];
name_text = mr3.exp[1];
}
inter_type con_type = InterTypes::parse_simple(InterBookmark::scope(IBM), eloc, kind_text, E);
if (*E) return;
inter_symbol *con_name = TextualInter::new_symbol(eloc, InterBookmark::scope(IBM), name_text, E);
if (*E) return;
SymbolAnnotation::copy_set_to_symbol(&(ilp->set), con_name);
text_stream *S = ilp->mr.exp[1];
match_results mr2 = Regexp::create_mr();
inter_ti op = 0;
if (Regexp::match(&mr2, S, L"sum{ (%c*) }")) op = CONSTANT_SUM_LIST;
else if (Regexp::match(&mr2, S, L"product{ (%c*) }")) op = CONSTANT_PRODUCT_LIST;
else if (Regexp::match(&mr2, S, L"difference{ (%c*) }")) op = CONSTANT_DIFFERENCE_LIST;
else if (Regexp::match(&mr2, S, L"quotient{ (%c*) }")) op = CONSTANT_QUOTIENT_LIST;
if (op != 0) {
inter_tree_node *P =
Inode::new_with_3_data_fields(IBM, CONSTANT_IST, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), op, eloc, (inter_ti) ilp->indent_level);
*E = Inter::Verify::instruction(InterBookmark::package(IBM), P);
if (*E) return;
text_stream *conts = mr2.exp[0];
match_results mr3 = Regexp::create_mr();
while (Regexp::match(&mr3, conts, L"(%c*?), (%c+)")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, con_type, P, mr3.exp[0], E) == FALSE)
return;
Str::copy(conts, mr3.exp[1]);
}
if (Regexp::match(&mr3, conts, L" *(%c*?) *")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, con_type, P, mr3.exp[0], E) == FALSE)
return;
}
NodePlacement::move_to_moving_bookmark(P, IBM);
return;
}
if (Regexp::match(&mr2, S, L"{ }")) {
inter_ti form = CONSTANT_INDIRECT_LIST;
inter_tree_node *P =
Inode::new_with_3_data_fields(IBM, CONSTANT_IST, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), form, eloc, (inter_ti) ilp->indent_level);
*E = Inter::Verify::instruction(InterBookmark::package(IBM), P);
if (*E) return;
NodePlacement::move_to_moving_bookmark(P, IBM);
return;
}
if (Regexp::match(&mr2, S, L"{ (%c*) }")) {
inter_type conts_type = InterTypes::type_operand(con_type, 0);
inter_ti form = CONSTANT_INDIRECT_LIST;
inter_tree_node *P =
Inode::new_with_3_data_fields(IBM, CONSTANT_IST, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), form, eloc, (inter_ti) ilp->indent_level);
*E = Inter::Verify::instruction(InterBookmark::package(IBM), P);
if (*E) return;
text_stream *conts = mr2.exp[0];
match_results mr3 = Regexp::create_mr();
while (Regexp::match(&mr3, conts, L"(%c*?), (%c+)")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, conts_type, P, mr3.exp[0], E) == FALSE)
return;
Str::copy(conts, mr3.exp[1]);
}
if (Regexp::match(&mr3, conts, L" *(%c*?) *")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, conts_type, P, mr3.exp[0], E) == FALSE)
return;
}
NodePlacement::move_to_moving_bookmark(P, IBM);
return;
}
if (Regexp::match(&mr2, S, L"struct{ (%c*) }")) {
inter_tree_node *P =
Inode::new_with_3_data_fields(IBM, CONSTANT_IST, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), CONSTANT_STRUCT, eloc, (inter_ti) ilp->indent_level);
int arity = InterTypes::type_arity(con_type);
int counter = 0;
text_stream *conts = mr2.exp[0];
match_results mr3 = Regexp::create_mr();
while (Regexp::match(&mr3, conts, L"(%c*?), (%c+)")) {
inter_type conts_type = InterTypes::type_operand(con_type, counter++);
if (Inter::Constant::append(ilp->line, eloc, IBM, conts_type, P, mr3.exp[0], E) == FALSE)
return;
Str::copy(conts, mr3.exp[1]);
}
if (Regexp::match(&mr3, conts, L" *(%c*?) *")) {
inter_type conts_type = InterTypes::type_operand(con_type, counter++);
if (Inter::Constant::append(ilp->line, eloc, IBM, conts_type, P, mr3.exp[0], E) == FALSE)
return;
}
if (counter != arity)
{ *E = Inter::Errors::quoted(I"wrong size", S, eloc); return; }
*E = Inter::Verify::instruction(InterBookmark::package(IBM), P); if (*E) return;
NodePlacement::move_to_moving_bookmark(P, IBM);
return;
}
if (Regexp::match(&mr2, S, L"table{ (%c*) }")) {
inter_tree_node *P =
Inode::new_with_3_data_fields(IBM, CONSTANT_IST, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), CONSTANT_TABLE, eloc, (inter_ti) ilp->indent_level);
*E = Inter::Verify::instruction(InterBookmark::package(IBM), P);
if (*E) return;
text_stream *conts = mr2.exp[0];
match_results mr3 = Regexp::create_mr();
while (Regexp::match(&mr3, conts, L"(%c*?), (%c+)")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, InterTypes::untyped(), P, mr3.exp[0], E) == FALSE)
return;
Str::copy(conts, mr3.exp[1]);
}
if (Regexp::match(&mr3, conts, L" *(%c*?) *")) {
if (Inter::Constant::append(ilp->line, eloc, IBM, InterTypes::untyped(), P, mr3.exp[0], E) == FALSE)
return;
}
NodePlacement::move_to_moving_bookmark(P, IBM);
return;
}
if ((Str::begins_with_wide_string(S, L"\"")) && (Str::ends_with_wide_string(S, L"\""))) {
TEMPORARY_TEXT(parsed_text)
*E = Inter::Constant::parse_text(parsed_text, S, 1, Str::len(S)-2, eloc);
inter_ti ID = 0;
if (*E == NULL) {
ID = InterWarehouse::create_text(InterBookmark::warehouse(IBM), InterBookmark::package(IBM));
Str::copy(InterWarehouse::get_text(InterBookmark::warehouse(IBM), ID), parsed_text);
}
DISCARD_TEXT(parsed_text)
if (*E) return;
*E = Inter::Constant::new_textual(IBM, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), ID, (inter_ti) ilp->indent_level, eloc);
return;
}
if (Regexp::match(&mr2, S, L"function (%c*)")) {
text_stream *fname = mr2.exp[0];
inter_package *block = InterPackage::from_name(InterBookmark::package(IBM), fname);
if (block == NULL) {
*E = Inter::Errors::quoted(I"no such function body", fname, eloc); return;
}
*E = Inter::Constant::new_function(IBM, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), block, (inter_ti) ilp->indent_level, eloc);
return;
}
inter_pair val = InterValuePairs::undef();
*E = InterValuePairs::parse(ilp->line, eloc, IBM, con_type, S, &val, InterBookmark::scope(IBM));
if (*E) return;
*E = Inter::Constant::new_numerical(IBM, InterSymbolsTable::id_from_symbol_at_bookmark(IBM, con_name), InterTypes::to_TID_wrt_bookmark(IBM, con_type), val, (inter_ti) ilp->indent_level, eloc);
}
inter_error_message *Inter::Constant::parse_text(text_stream *parsed_text, text_stream *S, int from, int to, inter_error_location *eloc) {
inter_error_message *E = NULL;
int literal_mode = FALSE;
LOOP_THROUGH_TEXT(pos, S) {
if ((pos.index < from) || (pos.index > to)) continue;
int c = (int) Str::get(pos);
if (literal_mode == FALSE) {
if (c == '\\') { literal_mode = TRUE; continue; }
} else {
switch (c) {
case '\\': break;
case '"': break;
case 't': c = 9; break;
case 'n': c = 10; break;
default: E = Inter::Errors::plain(I"no such backslash escape", eloc); break;
}
}
if (Inter::Constant::char_acceptable(c) == FALSE) E = Inter::Errors::quoted(I"bad character in text", S, eloc);
PUT_TO(parsed_text, c);
literal_mode = FALSE;
}
if (E) Str::clear(parsed_text);
return E;
}
void Inter::Constant::write_text(OUTPUT_STREAM, text_stream *S) {
LOOP_THROUGH_TEXT(P, S) {
wchar_t c = Str::get(P);
if (c == 9) { WRITE("\\t"); continue; }
if (c == 10) { WRITE("\\n"); continue; }
if (c == '"') { WRITE("\\\""); continue; }
if (c == '\\') { WRITE("\\\\"); continue; }
PUT(c);
}
}
inter_error_message *Inter::Constant::new_numerical(inter_bookmark *IBM, inter_ti SID, inter_ti KID, inter_pair val, inter_ti level, inter_error_location *eloc) {
inter_tree_node *P = Inode::new_with_5_data_fields(IBM,
CONSTANT_IST, SID, KID, CONSTANT_DIRECT, InterValuePairs::to_word1(val), InterValuePairs::to_word2(val), eloc, level);
inter_error_message *E = Inter::Verify::instruction(InterBookmark::package(IBM), P); if (E) return E;
NodePlacement::move_to_moving_bookmark(P, IBM);
return NULL;
}
inter_error_message *Inter::Constant::new_textual(inter_bookmark *IBM, inter_ti SID, inter_ti KID, inter_ti TID, inter_ti level, inter_error_location *eloc) {
inter_tree_node *P = Inode::new_with_4_data_fields(IBM,
CONSTANT_IST, SID, KID, CONSTANT_INDIRECT_TEXT, TID, eloc, level);
inter_error_message *E = Inter::Verify::instruction(InterBookmark::package(IBM), P); if (E) return E;
NodePlacement::move_to_moving_bookmark(P, IBM);
return NULL;
}
inter_error_message *Inter::Constant::new_function(inter_bookmark *IBM, inter_ti SID, inter_ti KID, inter_package *block, inter_ti level, inter_error_location *eloc) {
inter_ti BID = block->resource_ID;
inter_tree_node *P = Inode::new_with_4_data_fields(IBM,
CONSTANT_IST, SID, KID, CONSTANT_ROUTINE, BID, eloc, level);
inter_error_message *E = Inter::Verify::instruction(InterBookmark::package(IBM), P); if (E) return E;
NodePlacement::move_to_moving_bookmark(P, IBM);
return NULL;
}
inter_error_message *Inter::Constant::new_list(inter_bookmark *IBM, inter_ti SID, inter_ti KID,
int no_pairs, inter_ti *v1_pile, inter_ti *v2_pile, inter_ti level, inter_error_location *eloc) {
inter_tree_node *AP = Inode::new_with_3_data_fields(IBM, CONSTANT_IST, SID, KID, CONSTANT_INDIRECT_LIST, eloc, level);
int pos = AP->W.extent;
Inode::extend_instruction_by(AP, (inter_ti) (2*no_pairs));
for (int i=0; i<no_pairs; i++) {
AP->W.instruction[pos++] = v1_pile[i];
AP->W.instruction[pos++] = v2_pile[i];
}
inter_error_message *E = Inter::Verify::instruction(InterBookmark::package(IBM), AP); if (E) return E;
NodePlacement::move_to_moving_bookmark(AP, IBM);
return NULL;
}
int Inter::Constant::append(text_stream *line, inter_error_location *eloc, inter_bookmark *IBM, inter_type conts_type, inter_tree_node *P, text_stream *S, inter_error_message **E) {
*E = NULL;
inter_pair val = InterValuePairs::undef();
*E = InterValuePairs::parse(line, eloc, IBM, conts_type, S, &val, InterBookmark::scope(IBM));
if (*E) return FALSE;
Inode::extend_instruction_by(P, 2);
InterValuePairs::to_field(P, P->W.extent-2, val);
return TRUE;
}
void Inter::Constant::transpose(inter_construct *IC, inter_tree_node *P, inter_ti *grid, inter_ti grid_extent, inter_error_message **E) {
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_ROUTINE)
P->W.instruction[DATA_CONST_IFLD] = grid[P->W.instruction[DATA_CONST_IFLD]];
switch (P->W.instruction[FORMAT_CONST_IFLD]) {
case CONSTANT_DIRECT:
InterValuePairs::to_field(P, DATA_CONST_IFLD,
InterValuePairs::transpose(InterValuePairs::in_field(P, DATA_CONST_IFLD), grid, grid_extent, E));
break;
case CONSTANT_INDIRECT_TEXT:
P->W.instruction[DATA_CONST_IFLD] = grid[P->W.instruction[DATA_CONST_IFLD]];
break;
case CONSTANT_SUM_LIST:
case CONSTANT_PRODUCT_LIST:
case CONSTANT_DIFFERENCE_LIST:
case CONSTANT_QUOTIENT_LIST:
case CONSTANT_INDIRECT_LIST:
case CONSTANT_STRUCT:
case CONSTANT_TABLE:
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
InterValuePairs::to_field(P, i,
InterValuePairs::transpose(InterValuePairs::in_field(P, i), grid, grid_extent, E));
}
break;
}
}
void Inter::Constant::verify(inter_construct *IC, inter_tree_node *P, inter_package *owner, inter_error_message **E) {
*E = Inter::Verify::TID_field(owner, P, KIND_CONST_IFLD);
if (*E) return;
inter_type it = InterTypes::from_TID_in_field(P, KIND_CONST_IFLD);
switch (P->W.instruction[FORMAT_CONST_IFLD]) {
case CONSTANT_DIRECT:
if (P->W.extent != DATA_CONST_IFLD + 2) { *E = Inode::error(P, I"extent wrong", NULL); return; }
*E = Inter::Verify::data_pair_fields(owner, P, DATA_CONST_IFLD, it);
if (*E) return;
break;
case CONSTANT_SUM_LIST:
case CONSTANT_PRODUCT_LIST:
case CONSTANT_DIFFERENCE_LIST:
case CONSTANT_QUOTIENT_LIST:
if ((P->W.extent % 2) != 1) { *E = Inode::error(P, I"extent wrong", NULL); return; }
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
*E = Inter::Verify::data_pair_fields(owner, P, i, it);
if (*E) return;
}
break;
case CONSTANT_TABLE:
if ((P->W.extent % 2) != 1) { *E = Inode::error(P, I"extent wrong", NULL); return; }
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
inter_ti V1 = P->W.instruction[i];
inter_ti V2 = P->W.instruction[i+1];
inter_symbol *symb = InterSymbolsTable::symbol_from_data_pair(V1, V2, InterPackage::scope(owner));
if (symb) {
inter_type type = InterTypes::of_symbol(symb);
inter_ti constructor = InterTypes::constructor_code(type);
if ((constructor != COLUMN_ITCONC) && (constructor != UNCHECKED_ITCONC)) {
*E = Inode::error(P, I"not a table column constant", NULL); return;
}
} else {
*E = Inode::error(P, I"not a table column constant", NULL); return;
}
}
break;
case CONSTANT_INDIRECT_LIST: {
if ((P->W.extent % 2) != 1) { *E = Inode::error(P, I"extent wrong", NULL); return; }
inter_type conts_type = InterTypes::type_operand(it, 0);
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
*E = Inter::Verify::data_pair_fields(owner, P, i, conts_type); if (*E) return;
}
break;
}
case CONSTANT_STRUCT: {
if ((P->W.extent % 2) != 1) { *E = Inode::error(P, I"extent odd", NULL); return; }
int arity = InterTypes::type_arity(it);
int given = (P->W.extent - DATA_CONST_IFLD)/2;
if (arity != given) { *E = Inode::error(P, I"extent not same size as struct definition", NULL); return; }
for (int i=DATA_CONST_IFLD, counter = 0; i<P->W.extent; i=i+2) {
inter_type conts_type = InterTypes::type_operand(it, counter++);
*E = Inter::Verify::data_pair_fields(owner, P, i, conts_type); if (*E) return;
}
break;
}
case CONSTANT_INDIRECT_TEXT:
if (P->W.extent != DATA_CONST_IFLD + 1) { *E = Inode::error(P, I"extent wrong", NULL); return; }
inter_ti ID = P->W.instruction[DATA_CONST_IFLD];
text_stream *S = Inode::ID_to_text(P, ID);
if (S == NULL) { *E = Inode::error(P, I"no text in comment", NULL); return; }
LOOP_THROUGH_TEXT(pos, S)
if (Inter::Constant::char_acceptable(Str::get(pos)) == FALSE)
{ *E = Inode::error(P, I"bad character in text", NULL); return; }
break;
case CONSTANT_ROUTINE:
if (P->W.extent != DATA_CONST_IFLD + 1) { *E = Inode::error(P, I"extent wrong", NULL); return; }
break;
}
}
void Inter::Constant::write(inter_construct *IC, OUTPUT_STREAM, inter_tree_node *P, inter_error_message **E) {
inter_symbol *con_name = InterSymbolsTable::symbol_from_ID_at_node(P, DEFN_CONST_IFLD);
int hex = FALSE;
if (SymbolAnnotation::get_b(con_name, HEX_IANN)) hex = TRUE;
if (con_name) {
WRITE("constant ");
InterTypes::write_optional_type_marker(OUT, P, KIND_CONST_IFLD);
WRITE("%S = ", InterSymbol::identifier(con_name));
switch (P->W.instruction[FORMAT_CONST_IFLD]) {
case CONSTANT_DIRECT:
InterValuePairs::write(OUT, P, InterValuePairs::in_field(P, DATA_CONST_IFLD), InterPackage::scope_of(P), hex);
break;
case CONSTANT_TABLE:
case CONSTANT_SUM_LIST:
case CONSTANT_PRODUCT_LIST:
case CONSTANT_DIFFERENCE_LIST:
case CONSTANT_QUOTIENT_LIST:
case CONSTANT_INDIRECT_LIST: {
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_TABLE) WRITE("table");
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_SUM_LIST) WRITE("sum");
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_PRODUCT_LIST) WRITE("product");
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIFFERENCE_LIST) WRITE("difference");
if (P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_QUOTIENT_LIST) WRITE("quotient");
WRITE("{");
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
if (i > DATA_CONST_IFLD) WRITE(",");
WRITE(" ");
InterValuePairs::write(OUT, P, InterValuePairs::in_field(P, i), InterPackage::scope_of(P), hex);
}
WRITE(" }");
break;
}
case CONSTANT_STRUCT: {
WRITE("struct{");
for (int i=DATA_CONST_IFLD; i<P->W.extent; i=i+2) {
if (i > DATA_CONST_IFLD) WRITE(",");
WRITE(" ");
InterValuePairs::write(OUT, P, InterValuePairs::in_field(P, i), InterPackage::scope_of(P), hex);
}
WRITE(" }");
break;
}
case CONSTANT_INDIRECT_TEXT:
WRITE("\"");
inter_ti ID = P->W.instruction[DATA_CONST_IFLD];
text_stream *S = Inode::ID_to_text(P, ID);
Inter::Constant::write_text(OUT, S);
WRITE("\"");
break;
case CONSTANT_ROUTINE: {
inter_package *block = Inode::ID_to_package(P, P->W.instruction[DATA_CONST_IFLD]);
WRITE("function %S", InterPackage::name(block));
break;
}
}
SymbolAnnotation::write_annotations(OUT, P, con_name);
} else {
*E = Inode::error(P, I"constant can't be written", NULL);
return;
}
}
inter_package *Inter::Constant::code_block(inter_symbol *con_symbol) {
if (con_symbol == NULL) return NULL;
inter_tree_node *D = InterSymbol::definition(con_symbol);
if (D == NULL) return NULL;
if (D->W.instruction[ID_IFLD] != CONSTANT_IST) return NULL;
if (D->W.instruction[FORMAT_CONST_IFLD] != CONSTANT_ROUTINE) return NULL;
return Inode::ID_to_package(D, D->W.instruction[DATA_CONST_IFLD]);
}
int Inter::Constant::is_routine(inter_symbol *con_symbol) {
if (con_symbol == NULL) return FALSE;
inter_tree_node *D = InterSymbol::definition(con_symbol);
if (D == NULL) return FALSE;
if (D->W.instruction[ID_IFLD] != CONSTANT_IST) return FALSE;
if (D->W.instruction[FORMAT_CONST_IFLD] != CONSTANT_ROUTINE) return FALSE;
return TRUE;
}
inter_symbols_table *Inter::Constant::local_symbols(inter_symbol *con_symbol) {
return InterPackage::scope(Inter::Constant::code_block(con_symbol));
}
int Inter::Constant::char_acceptable(int c) {
if ((c < 0x20) && (c != 0x09) && (c != 0x0a)) return FALSE;
return TRUE;
}
int Inter::Constant::constant_depth(inter_symbol *con) {
LOG_INDENT;
int d = Inter::Constant::constant_depth_r(con);
LOGIF(CONSTANT_DEPTH_CALCULATION, "%S has depth %d\n", InterSymbol::identifier(con), d);
LOG_OUTDENT;
return d;
}
int Inter::Constant::constant_depth_r(inter_symbol *con) {
if (con == NULL) return 1;
inter_tree_node *D = InterSymbol::definition(con);
if (D->W.instruction[ID_IFLD] != CONSTANT_IST) return 1;
if (D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIRECT) {
inter_ti val1 = D->W.instruction[DATA_CONST_IFLD];
inter_ti val2 = D->W.instruction[DATA_CONST_IFLD + 1];
if (val1 == ALIAS_IVAL) {
inter_symbol *alias =
InterSymbolsTable::symbol_from_data_pair(
val1, val2, InterPackage::scope(D->package));
return Inter::Constant::constant_depth(alias) + 1;
}
return 1;
}
if ((D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_SUM_LIST) ||
(D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_PRODUCT_LIST) ||
(D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIFFERENCE_LIST) ||
(D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_QUOTIENT_LIST)) {
int total = 0;
for (int i=DATA_CONST_IFLD; i<D->W.extent; i=i+2) {
inter_ti val1 = D->W.instruction[i];
inter_ti val2 = D->W.instruction[i + 1];
if (val1 == ALIAS_IVAL) {
inter_symbol *alias =
InterSymbolsTable::symbol_from_data_pair(
val1, val2, InterPackage::scope(D->package));
total += Inter::Constant::constant_depth(alias);
} else total++;
}
return 1 + total;
}
return 1;
}
inter_ti Inter::Constant::evaluate(inter_symbols_table *T, inter_ti val1, inter_ti val2) {
if (val1 == LITERAL_IVAL) return val2;
if (InterValuePairs::holds_symbol(val1, val2)) {
inter_symbol *aliased = InterSymbolsTable::symbol_from_data_pair(val1, val2, T);
if (aliased == NULL) internal_error("bad aliased symbol");
inter_tree_node *D = aliased->definition;
if (D == NULL) internal_error("undefined symbol");
switch (D->W.instruction[FORMAT_CONST_IFLD]) {
case CONSTANT_DIRECT: {
inter_ti dval1 = D->W.instruction[DATA_CONST_IFLD];
inter_ti dval2 = D->W.instruction[DATA_CONST_IFLD + 1];
inter_ti e = Inter::Constant::evaluate(InterPackage::scope_of(D), dval1, dval2);
return e;
}
case CONSTANT_SUM_LIST:
case CONSTANT_PRODUCT_LIST:
case CONSTANT_DIFFERENCE_LIST:
case CONSTANT_QUOTIENT_LIST: {
inter_ti result = 0;
for (int i=DATA_CONST_IFLD; i<D->W.extent; i=i+2) {
inter_ti extra = Inter::Constant::evaluate(InterPackage::scope_of(D), D->W.instruction[i], D->W.instruction[i+1]);
if (i == DATA_CONST_IFLD) result = extra;
else {
if (D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_SUM_LIST) result = result + extra;
if (D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_PRODUCT_LIST) result = result * extra;
if (D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIFFERENCE_LIST) result = result - extra;
if (D->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_QUOTIENT_LIST) result = result / extra;
}
}
return result;
}
}
}
return 0;
}
int Inter::Constant::evaluate_to_int(inter_symbol *S) {
inter_tree_node *P = InterSymbol::definition(S);
if ((P) &&
(P->W.instruction[ID_IFLD] == CONSTANT_IST) &&
(P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIRECT) &&
(P->W.instruction[DATA_CONST_IFLD] == LITERAL_IVAL)) {
return (int) P->W.instruction[DATA_CONST_IFLD + 1];
}
if ((P) &&
(P->W.instruction[ID_IFLD] == CONSTANT_IST) &&
(P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIRECT) &&
(P->W.instruction[DATA_CONST_IFLD] == ALIAS_IVAL)) {
inter_symbols_table *scope = S->owning_table;
inter_symbol *alias_to = InterSymbolsTable::symbol_from_ID(scope, P->W.instruction[DATA_CONST_IFLD + 1]);
return InterSymbol::evaluate_to_int(alias_to);
}
return -1;
}
int Inter::Constant::set_int(inter_symbol *S, int N) {
inter_tree_node *P = InterSymbol::definition(S);
if ((P) &&
(P->W.instruction[ID_IFLD] == CONSTANT_IST) &&
(P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIRECT) &&
(P->W.instruction[DATA_CONST_IFLD] == LITERAL_IVAL)) {
P->W.instruction[DATA_CONST_IFLD + 1] = (inter_ti) N;
return TRUE;
}
if ((P) &&
(P->W.instruction[ID_IFLD] == CONSTANT_IST) &&
(P->W.instruction[FORMAT_CONST_IFLD] == CONSTANT_DIRECT) &&
(P->W.instruction[DATA_CONST_IFLD] == ALIAS_IVAL)) {
inter_symbols_table *scope = S->owning_table;
inter_symbol *alias_to = InterSymbolsTable::symbol_from_ID(scope, P->W.instruction[DATA_CONST_IFLD + 1]);
InterSymbol::set_int(alias_to, N);
return TRUE;
}
return FALSE;
}
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