2 * This file is part of cparser.
3 * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
26 #include "lang_features.h"
36 #if defined(__INTEL_COMPILER)
38 #elif defined(__CYGWIN__)
39 #include "win32/cygwin_math_ext.h"
44 #include "adt/error.h"
47 struct obstack ast_obstack;
50 static int case_indent;
52 bool print_implicit_casts = false;
53 bool print_parenthesis = false;
55 static void print_statement(const statement_t *statement);
56 static void print_expression_prec(const expression_t *expression, unsigned prec);
58 void change_indent(int delta)
64 void print_indent(void)
66 for (int i = 0; i < indent; ++i)
70 static void print_stringrep(const string_t *string)
72 for (size_t i = 0; i < string->size; ++i) {
73 print_char(string->begin[i]);
78 * Returns 1 if a given precedence level has right-to-left
79 * associativity, else 0.
81 * @param precedence the operator precedence
83 static int right_to_left(unsigned precedence)
87 case PREC_CONDITIONAL:
97 * Return the precedence of an expression given by its kind.
99 * @param kind the expression kind
101 static unsigned get_expression_precedence(expression_kind_t kind)
103 static const unsigned prec[] = {
104 [EXPR_ERROR] = PREC_PRIMARY,
105 [EXPR_REFERENCE] = PREC_PRIMARY,
106 [EXPR_ENUM_CONSTANT] = PREC_PRIMARY,
107 [EXPR_LITERAL_INTEGER] = PREC_PRIMARY,
108 [EXPR_LITERAL_FLOATINGPOINT] = PREC_PRIMARY,
109 [EXPR_LITERAL_CHARACTER] = PREC_PRIMARY,
110 [EXPR_LITERAL_WIDE_CHARACTER] = PREC_PRIMARY,
111 [EXPR_LITERAL_MS_NOOP] = PREC_PRIMARY,
112 [EXPR_STRING_LITERAL] = PREC_PRIMARY,
113 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
114 [EXPR_CALL] = PREC_POSTFIX,
115 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
116 [EXPR_SELECT] = PREC_POSTFIX,
117 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
118 [EXPR_SIZEOF] = PREC_UNARY,
119 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
120 [EXPR_ALIGNOF] = PREC_UNARY,
122 [EXPR_FUNCNAME] = PREC_PRIMARY,
123 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
124 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
125 [EXPR_OFFSETOF] = PREC_PRIMARY,
126 [EXPR_VA_START] = PREC_PRIMARY,
127 [EXPR_VA_ARG] = PREC_PRIMARY,
128 [EXPR_VA_COPY] = PREC_PRIMARY,
129 [EXPR_STATEMENT] = PREC_PRIMARY,
130 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
132 [EXPR_UNARY_NEGATE] = PREC_UNARY,
133 [EXPR_UNARY_PLUS] = PREC_UNARY,
134 [EXPR_UNARY_BITWISE_NEGATE] = PREC_UNARY,
135 [EXPR_UNARY_NOT] = PREC_UNARY,
136 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
137 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
138 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
139 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
140 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
141 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
142 [EXPR_UNARY_CAST] = PREC_UNARY,
143 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
144 [EXPR_UNARY_DELETE] = PREC_UNARY,
145 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
146 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
148 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
149 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
150 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
151 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
152 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
153 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
154 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
155 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
156 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
157 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
158 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
159 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
160 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
161 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
162 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
163 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
164 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
165 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
166 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
167 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
168 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
169 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
170 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
171 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
172 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
173 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
174 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
175 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
176 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
177 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
179 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
180 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
181 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
182 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
183 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
184 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
186 assert((size_t)kind < lengthof(prec));
187 unsigned res = prec[kind];
189 assert(res != PREC_BOTTOM);
194 * Print a quoted string constant.
196 * @param string the string constant
197 * @param border the border char
199 static void print_quoted_string(const string_t *const string, char border)
202 const char *end = string->begin + string->size;
203 for (const char *c = string->begin; c != end; ++c) {
209 case '\\': print_string("\\\\"); break;
210 case '\a': print_string("\\a"); break;
211 case '\b': print_string("\\b"); break;
212 case '\f': print_string("\\f"); break;
213 case '\n': print_string("\\n"); break;
214 case '\r': print_string("\\r"); break;
215 case '\t': print_string("\\t"); break;
216 case '\v': print_string("\\v"); break;
217 case '\?': print_string("\\?"); break;
219 if (c_mode & _GNUC) {
220 print_string("\\e"); break;
224 if ((unsigned)tc < 0x80 && !isprint(tc)) {
225 print_format("\\%03o", (unsigned)tc);
235 static void print_char_literal(string_literal_expression_t const *const literal)
237 if (literal->base.kind == EXPR_LITERAL_WIDE_CHARACTER)
239 print_quoted_string(&literal->value, '\'');
242 static void print_string_literal(const string_literal_expression_t *literal)
244 print_string(get_string_encoding_prefix(literal->encoding));
245 print_quoted_string(&literal->value, '"');
248 static void print_literal(const literal_expression_t *literal)
250 switch (literal->base.kind) {
251 case EXPR_LITERAL_MS_NOOP:
252 print_string("__noop");
255 case EXPR_LITERAL_BOOLEAN:
256 case EXPR_LITERAL_FLOATINGPOINT:
257 case EXPR_LITERAL_INTEGER:
258 print_stringrep(&literal->value);
259 print_stringrep(&literal->suffix);
265 print_string("INVALID LITERAL KIND");
269 * Prints a predefined symbol.
271 static void print_funcname(const funcname_expression_t *funcname)
274 switch (funcname->kind) {
275 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
276 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
277 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
278 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
283 static void print_compound_literal(
284 const compound_literal_expression_t *expression)
287 print_type(expression->type);
289 print_initializer(expression->initializer);
292 static void print_assignment_expression(const expression_t *const expr)
294 print_expression_prec(expr, PREC_ASSIGNMENT);
298 * Prints a call expression.
300 * @param call the call expression
302 static void print_call_expression(const call_expression_t *call)
304 print_expression_prec(call->function, PREC_POSTFIX);
306 char const *sep = "";
307 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
310 print_assignment_expression(arg->expression);
316 * Prints a binary expression.
318 * @param binexpr the binary expression
320 static void print_binary_expression(const binary_expression_t *binexpr)
322 unsigned prec = get_expression_precedence(binexpr->base.kind);
323 int r2l = right_to_left(prec);
325 print_expression_prec(binexpr->left, prec + r2l);
327 switch (binexpr->base.kind) {
328 case EXPR_BINARY_COMMA: op = ", "; break;
329 case EXPR_BINARY_ASSIGN: op = " = "; break;
330 case EXPR_BINARY_ADD: op = " + "; break;
331 case EXPR_BINARY_SUB: op = " - "; break;
332 case EXPR_BINARY_MUL: op = " * "; break;
333 case EXPR_BINARY_MOD: op = " % "; break;
334 case EXPR_BINARY_DIV: op = " / "; break;
335 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
336 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
337 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
338 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
339 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
340 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
341 case EXPR_BINARY_EQUAL: op = " == "; break;
342 case EXPR_BINARY_LESS: op = " < "; break;
343 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
344 case EXPR_BINARY_GREATER: op = " > "; break;
345 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
346 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
347 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
349 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
350 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
351 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
352 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
353 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
354 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
355 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
356 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
357 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
358 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
359 default: panic("invalid binexpression found");
362 print_expression_prec(binexpr->right, prec + 1 - r2l);
366 * Prints an unary expression.
368 * @param unexpr the unary expression
370 static void print_unary_expression(const unary_expression_t *unexpr)
372 unsigned prec = get_expression_precedence(unexpr->base.kind);
373 switch (unexpr->base.kind) {
374 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
375 case EXPR_UNARY_PLUS: print_char ('+' ); break;
376 case EXPR_UNARY_NOT: print_char ('!' ); break;
377 case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;
378 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
379 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
380 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
381 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
382 case EXPR_UNARY_DELETE: print_string("delete "); break;
383 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
385 case EXPR_UNARY_POSTFIX_INCREMENT:
386 print_expression_prec(unexpr->value, prec);
389 case EXPR_UNARY_POSTFIX_DECREMENT:
390 print_expression_prec(unexpr->value, prec);
393 case EXPR_UNARY_CAST:
395 print_type(unexpr->base.type);
398 case EXPR_UNARY_ASSUME:
399 print_string("__assume(");
400 print_assignment_expression(unexpr->value);
404 case EXPR_UNARY_THROW:
405 if (unexpr->value == NULL) {
406 print_string("throw");
409 print_string("throw ");
413 panic("invalid unary expression found");
415 print_expression_prec(unexpr->value, prec);
419 * Prints a reference expression.
421 * @param ref the reference expression
423 static void print_reference_expression(const reference_expression_t *ref)
425 print_string(ref->entity->base.symbol->string);
429 * Prints a label address expression.
431 * @param ref the reference expression
433 static void print_label_address_expression(const label_address_expression_t *le)
435 print_format("&&%s", le->label->base.symbol->string);
439 * Prints an array expression.
441 * @param expression the array expression
443 static void print_array_expression(const array_access_expression_t *expression)
445 if (!expression->flipped) {
446 print_expression_prec(expression->array_ref, PREC_POSTFIX);
448 print_expression(expression->index);
451 print_expression_prec(expression->index, PREC_POSTFIX);
453 print_expression(expression->array_ref);
459 * Prints a typeproperty expression (sizeof or __alignof__).
461 * @param expression the type property expression
463 static void print_typeprop_expression(const typeprop_expression_t *expression)
465 if (expression->base.kind == EXPR_SIZEOF) {
466 print_string("sizeof");
468 assert(expression->base.kind == EXPR_ALIGNOF);
469 print_string("__alignof__");
471 if (expression->tp_expression != NULL) {
472 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
473 print_expression_prec(expression->tp_expression, PREC_TOP);
476 print_type(expression->type);
482 * Prints a builtin constant expression.
484 * @param expression the builtin constant expression
486 static void print_builtin_constant(const builtin_constant_expression_t *expression)
488 print_string("__builtin_constant_p(");
489 print_assignment_expression(expression->value);
494 * Prints a builtin types compatible expression.
496 * @param expression the builtin types compatible expression
498 static void print_builtin_types_compatible(
499 const builtin_types_compatible_expression_t *expression)
501 print_string("__builtin_types_compatible_p(");
502 print_type(expression->left);
504 print_type(expression->right);
509 * Prints a conditional expression.
511 * @param expression the conditional expression
513 static void print_conditional(const conditional_expression_t *expression)
515 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
516 if (expression->true_expression != NULL) {
518 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
521 print_string(" ?: ");
523 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
524 print_expression_prec(expression->false_expression, prec);
528 * Prints a va_start expression.
530 * @param expression the va_start expression
532 static void print_va_start(const va_start_expression_t *const expression)
534 print_string("__builtin_va_start(");
535 print_assignment_expression(expression->ap);
537 print_assignment_expression(expression->parameter);
542 * Prints a va_arg expression.
544 * @param expression the va_arg expression
546 static void print_va_arg(const va_arg_expression_t *expression)
548 print_string("__builtin_va_arg(");
549 print_assignment_expression(expression->ap);
551 print_type(expression->base.type);
556 * Prints a va_copy expression.
558 * @param expression the va_copy expression
560 static void print_va_copy(const va_copy_expression_t *expression)
562 print_string("__builtin_va_copy(");
563 print_assignment_expression(expression->dst);
565 print_assignment_expression(expression->src);
570 * Prints a select expression (. or ->).
572 * @param expression the select expression
574 static void print_select(const select_expression_t *expression)
576 print_expression_prec(expression->compound, PREC_POSTFIX);
577 /* do not print anything for anonymous struct/union selects
578 * FIXME: if the anonymous select was a '->' this will print '.'
580 if (expression->compound_entry->base.symbol == NULL)
583 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
588 print_string(expression->compound_entry->base.symbol->string);
592 * Prints a type classify expression.
594 * @param expr the type classify expression
596 static void print_classify_type_expression(
597 const classify_type_expression_t *const expr)
599 print_string("__builtin_classify_type(");
600 print_assignment_expression(expr->type_expression);
605 * Prints a designator.
607 * @param designator the designator
609 static void print_designator(const designator_t *designator)
611 for ( ; designator != NULL; designator = designator->next) {
612 if (designator->symbol == NULL) {
614 print_expression(designator->array_index);
618 print_string(designator->symbol->string);
624 * Prints an offsetof expression.
626 * @param expression the offset expression
628 static void print_offsetof_expression(const offsetof_expression_t *expression)
630 print_string("__builtin_offsetof(");
631 print_type(expression->type);
633 print_designator(expression->designator);
638 * Prints a statement expression.
640 * @param expression the statement expression
642 static void print_statement_expression(const statement_expression_t *expression)
645 print_statement(expression->statement);
649 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
651 if (expr->base.parenthesized)
654 if (top_prec > get_expression_precedence(expr->base.kind))
657 if (print_parenthesis && top_prec != PREC_BOTTOM) {
658 switch (expr->kind) {
659 case EXPR_ENUM_CONSTANT:
661 case EXPR_LITERAL_CASES:
662 case EXPR_LITERAL_CHARACTER:
663 case EXPR_LITERAL_WIDE_CHARACTER:
665 case EXPR_STRING_LITERAL:
666 /* Do not print () around subexpressions consisting of a single token. */
678 * Prints an expression with parenthesis if needed.
680 * @param expression the expression to print
681 * @param top_prec the precedence of the user of this expression.
683 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
685 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
686 expr = expr->unary.value;
689 bool const parenthesized = needs_parentheses(expr, top_prec);
693 switch (expr->kind) {
695 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
696 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
697 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
698 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
699 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
700 case EXPR_CALL: print_call_expression( &expr->call); break;
701 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
702 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
703 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
704 case EXPR_ERROR: print_string("$error$"); break;
705 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
706 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
707 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
708 case EXPR_LITERAL_CHARACTER:
709 case EXPR_LITERAL_WIDE_CHARACTER: print_char_literal( &expr->string_literal); break;
710 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
712 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
713 case EXPR_SELECT: print_select( &expr->select); break;
714 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
715 case EXPR_STRING_LITERAL: print_string_literal( &expr->string_literal); break;
716 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
717 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
718 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
719 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
725 static void print_indented_statement(statement_t const *const stmt)
727 switch (stmt->kind) {
728 case STATEMENT_LABEL:
731 case STATEMENT_CASE_LABEL:
732 for (int i = 0; i != case_indent; ++i)
740 print_statement(stmt);
744 * Print an compound statement.
746 * @param block the compound statement
748 static void print_compound_statement(const compound_statement_t *block)
753 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
754 print_indented_statement(stmt);
764 * Print a return statement.
766 * @param statement the return statement
768 static void print_return_statement(const return_statement_t *statement)
770 expression_t const *const val = statement->value;
772 print_string("return ");
773 print_expression(val);
776 print_string("return;");
781 * Print an expression statement.
783 * @param statement the expression statement
785 static void print_expression_statement(const expression_statement_t *statement)
787 print_expression(statement->expression);
792 * Print a computed goto statement.
794 * @param statement the computed goto statement
796 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
798 print_string("goto *");
799 print_expression(stmt->expression);
804 * Print a goto statement.
806 * @param statement the goto statement
808 static void print_goto_statement(const goto_statement_t *statement)
810 print_string("goto ");
811 print_string(statement->label->base.symbol->string);
816 * Print a label statement.
818 * @param statement the label statement
820 static void print_label_statement(const label_statement_t *statement)
822 print_format("%s:\n", statement->label->base.symbol->string);
823 print_indented_statement(statement->statement);
826 static void print_inner_statement(statement_t const *const stmt)
828 if (stmt->kind == STATEMENT_COMPOUND) {
830 print_compound_statement(&stmt->compound);
834 print_indented_statement(stmt);
839 static void print_after_inner_statement(statement_t const *const stmt)
841 if (stmt->kind == STATEMENT_COMPOUND) {
850 * Print an if statement.
852 * @param statement the if statement
854 static void print_if_statement(const if_statement_t *statement)
856 print_string("if (");
857 print_expression(statement->condition);
859 print_inner_statement(statement->true_statement);
861 statement_t const *const f = statement->false_statement;
863 print_after_inner_statement(statement->true_statement);
864 print_string("else");
865 if (f->kind == STATEMENT_IF) {
867 print_if_statement(&f->ifs);
869 print_inner_statement(f);
875 * Print a switch statement.
877 * @param statement the switch statement
879 static void print_switch_statement(const switch_statement_t *statement)
881 int const old_case_indent = case_indent;
882 case_indent = indent;
884 print_string("switch (");
885 print_expression(statement->expression);
887 print_inner_statement(statement->body);
889 case_indent = old_case_indent;
893 * Print a case label (including the default label).
895 * @param statement the case label statement
897 static void print_case_label(const case_label_statement_t *statement)
899 if (statement->expression == NULL) {
900 print_string("default:\n");
902 print_string("case ");
903 print_expression(statement->expression);
904 if (statement->end_range != NULL) {
905 print_string(" ... ");
906 print_expression(statement->end_range);
910 print_indented_statement(statement->statement);
913 static void print_typedef(const entity_t *entity)
915 print_string("typedef ");
916 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
921 * returns true if the entity is a compiler generated one and has no real
922 * correspondenc in the source file
924 static bool is_generated_entity(const entity_t *entity)
926 if (entity->kind == ENTITY_TYPEDEF)
927 return entity->typedefe.builtin;
929 if (is_declaration(entity))
930 return entity->declaration.implicit;
936 * Print a declaration statement.
938 * @param statement the statement
940 static void print_declaration_statement(
941 const declaration_statement_t *statement)
944 entity_t *entity = statement->declarations_begin;
945 if (entity == NULL) {
946 print_string("/* empty declaration statement */");
950 entity_t *const end = statement->declarations_end->base.next;
951 for (; entity != end; entity = entity->base.next) {
952 if (entity->kind == ENTITY_ENUM_VALUE)
954 if (is_generated_entity(entity))
964 print_entity(entity);
969 * Print a while statement.
971 * @param statement the statement
973 static void print_while_statement(const while_statement_t *statement)
975 print_string("while (");
976 print_expression(statement->condition);
978 print_inner_statement(statement->body);
982 * Print a do-while statement.
984 * @param statement the statement
986 static void print_do_while_statement(const do_while_statement_t *statement)
989 print_inner_statement(statement->body);
990 print_after_inner_statement(statement->body);
991 print_string("while (");
992 print_expression(statement->condition);
997 * Print a for statement.
999 * @param statement the statement
1001 static void print_for_statement(const for_statement_t *statement)
1003 print_string("for (");
1004 if (statement->initialisation != NULL) {
1005 print_expression(statement->initialisation);
1008 entity_t const *entity = statement->scope.entities;
1009 for (; entity != NULL; entity = entity->base.next) {
1010 if (is_generated_entity(entity))
1012 /* FIXME display of multiple declarations is wrong */
1013 print_declaration(entity);
1016 if (statement->condition != NULL) {
1018 print_expression(statement->condition);
1021 if (statement->step != NULL) {
1023 print_expression(statement->step);
1026 print_inner_statement(statement->body);
1030 * Print assembler arguments.
1032 * @param arguments the arguments
1034 static void print_asm_arguments(asm_argument_t *arguments)
1036 asm_argument_t *argument = arguments;
1037 for (; argument != NULL; argument = argument->next) {
1038 if (argument != arguments)
1041 if (argument->symbol) {
1042 print_format("[%s] ", argument->symbol->string);
1044 print_quoted_string(&argument->constraints, '"');
1046 print_expression(argument->expression);
1052 * Print assembler clobbers.
1054 * @param clobbers the clobbers
1056 static void print_asm_clobbers(asm_clobber_t *clobbers)
1058 asm_clobber_t *clobber = clobbers;
1059 for (; clobber != NULL; clobber = clobber->next) {
1060 if (clobber != clobbers)
1063 print_quoted_string(&clobber->clobber, '"');
1068 * Print an assembler statement.
1070 * @param statement the statement
1072 static void print_asm_statement(const asm_statement_t *statement)
1074 print_string("asm ");
1075 if (statement->is_volatile) {
1076 print_string("volatile ");
1079 print_quoted_string(&statement->asm_text, '"');
1080 if (statement->outputs == NULL &&
1081 statement->inputs == NULL &&
1082 statement->clobbers == NULL)
1083 goto end_of_print_asm_statement;
1085 print_string(" : ");
1086 print_asm_arguments(statement->outputs);
1087 if (statement->inputs == NULL && statement->clobbers == NULL)
1088 goto end_of_print_asm_statement;
1090 print_string(" : ");
1091 print_asm_arguments(statement->inputs);
1092 if (statement->clobbers == NULL)
1093 goto end_of_print_asm_statement;
1095 print_string(" : ");
1096 print_asm_clobbers(statement->clobbers);
1098 end_of_print_asm_statement:
1103 * Print a microsoft __try statement.
1105 * @param statement the statement
1107 static void print_ms_try_statement(const ms_try_statement_t *statement)
1109 print_string("__try");
1110 print_inner_statement(statement->try_statement);
1111 print_after_inner_statement(statement->try_statement);
1112 if (statement->except_expression != NULL) {
1113 print_string("__except(");
1114 print_expression(statement->except_expression);
1117 print_string("__finally");
1119 print_inner_statement(statement->final_statement);
1123 * Print a microsoft __leave statement.
1125 * @param statement the statement
1127 static void print_leave_statement(const leave_statement_t *statement)
1130 print_string("__leave;");
1134 * Print a statement.
1136 * @param statement the statement
1138 void print_statement(statement_t const *const stmt)
1140 switch (stmt->kind) {
1141 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1142 case STATEMENT_BREAK: print_string("break;"); break;
1143 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1144 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1145 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1146 case STATEMENT_CONTINUE: print_string("continue;"); break;
1147 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1148 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1149 case STATEMENT_EMPTY: print_char(';'); break;
1150 case STATEMENT_ERROR: print_string("$error statement$"); break;
1151 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1152 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1153 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1154 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1155 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1156 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1157 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1158 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1159 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1160 case STATEMENT_WHILE: print_while_statement( &stmt->whiles); break;
1165 * Print a storage class.
1167 * @param storage_class the storage class
1169 static void print_storage_class(storage_class_tag_t storage_class)
1171 switch (storage_class) {
1172 case STORAGE_CLASS_NONE: return;
1173 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1174 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1175 case STORAGE_CLASS_STATIC: print_string("static "); return;
1176 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1177 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1179 panic("invalid storage class");
1183 * Print an initializer.
1185 * @param initializer the initializer
1187 void print_initializer(const initializer_t *initializer)
1189 if (initializer == NULL) {
1194 switch (initializer->kind) {
1195 case INITIALIZER_VALUE: {
1196 const initializer_value_t *value = &initializer->value;
1197 print_assignment_expression(value->value);
1200 case INITIALIZER_LIST: {
1201 assert(initializer->kind == INITIALIZER_LIST);
1203 const initializer_list_t *list = &initializer->list;
1205 for (size_t i = 0 ; i < list->len; ++i) {
1206 const initializer_t *sub_init = list->initializers[i];
1207 print_initializer(list->initializers[i]);
1208 if (i < list->len-1) {
1209 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1216 case INITIALIZER_STRING:
1217 print_quoted_string(&initializer->string.string, '"');
1219 case INITIALIZER_WIDE_STRING:
1220 print_quoted_string(&initializer->string.string, '"');
1222 case INITIALIZER_DESIGNATOR:
1223 print_designator(initializer->designator.designator);
1224 print_string(" = ");
1228 panic("invalid initializer kind found");
1233 * Print microsoft extended declaration modifiers.
1235 static void print_ms_modifiers(const declaration_t *declaration)
1237 if ((c_mode & _MS) == 0)
1240 decl_modifiers_t modifiers = declaration->modifiers;
1242 bool ds_shown = false;
1243 const char *next = "(";
1245 if (declaration->base.kind == ENTITY_VARIABLE) {
1246 variable_t *variable = (variable_t*)declaration;
1247 if (variable->alignment != 0
1248 || variable->get_property_sym != NULL
1249 || variable->put_property_sym != NULL) {
1251 print_string("__declspec");
1255 if (variable->alignment != 0) {
1256 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1258 if (variable->get_property_sym != NULL
1259 || variable->put_property_sym != NULL) {
1261 print_string(next); next = ", "; print_string("property(");
1262 if (variable->get_property_sym != NULL) {
1263 print_format("get=%s", variable->get_property_sym->string);
1266 if (variable->put_property_sym != NULL)
1267 print_format("%sput=%s", comma, variable->put_property_sym->string);
1273 /* DM_FORCEINLINE handled outside. */
1274 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1276 print_string("__declspec");
1279 if (modifiers & DM_DLLIMPORT) {
1280 print_string(next); next = ", "; print_string("dllimport");
1282 if (modifiers & DM_DLLEXPORT) {
1283 print_string(next); next = ", "; print_string("dllexport");
1285 if (modifiers & DM_THREAD) {
1286 print_string(next); next = ", "; print_string("thread");
1288 if (modifiers & DM_NAKED) {
1289 print_string(next); next = ", "; print_string("naked");
1291 if (modifiers & DM_THREAD) {
1292 print_string(next); next = ", "; print_string("thread");
1294 if (modifiers & DM_SELECTANY) {
1295 print_string(next); next = ", "; print_string("selectany");
1297 if (modifiers & DM_NOTHROW) {
1298 print_string(next); next = ", "; print_string("nothrow");
1300 if (modifiers & DM_NORETURN) {
1301 print_string(next); next = ", "; print_string("noreturn");
1303 if (modifiers & DM_NOINLINE) {
1304 print_string(next); next = ", "; print_string("noinline");
1306 if (modifiers & DM_DEPRECATED) {
1307 print_string(next); next = ", "; print_string("deprecated");
1308 if (declaration->deprecated_string != NULL)
1309 print_format("(\"%s\")",
1310 declaration->deprecated_string);
1312 if (modifiers & DM_RESTRICT) {
1313 print_string(next); next = ", "; print_string("restrict");
1315 if (modifiers & DM_NOALIAS) {
1316 print_string(next); next = ", "; print_string("noalias");
1325 static void print_scope(const scope_t *scope)
1327 const entity_t *entity = scope->entities;
1328 for ( ; entity != NULL; entity = entity->base.next) {
1330 print_entity(entity);
1335 static void print_namespace(const namespace_t *namespace)
1337 print_string("namespace ");
1338 if (namespace->base.symbol != NULL) {
1339 print_string(namespace->base.symbol->string);
1343 print_string("{\n");
1346 print_scope(&namespace->members);
1350 print_string("}\n");
1354 * Print a variable or function declaration
1356 void print_declaration(const entity_t *entity)
1358 assert(is_declaration(entity));
1359 const declaration_t *declaration = &entity->declaration;
1361 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1362 if (entity->kind == ENTITY_FUNCTION) {
1363 function_t *function = (function_t*)declaration;
1364 if (function->is_inline) {
1365 if (declaration->modifiers & DM_FORCEINLINE) {
1366 print_string("__forceinline ");
1367 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1368 print_string("__inline ");
1370 print_string("inline ");
1374 //print_ms_modifiers(declaration);
1375 switch (entity->kind) {
1376 case ENTITY_FUNCTION:
1377 print_type_ext(entity->declaration.type, entity->base.symbol,
1378 &entity->function.parameters);
1380 if (entity->function.statement != NULL) {
1382 print_indented_statement(entity->function.statement);
1388 case ENTITY_VARIABLE:
1389 if (entity->variable.thread_local)
1390 print_string("__thread ");
1391 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1392 if (entity->variable.initializer != NULL) {
1393 print_string(" = ");
1394 print_initializer(entity->variable.initializer);
1398 case ENTITY_COMPOUND_MEMBER:
1399 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1400 if (entity->compound_member.bitfield) {
1401 print_format(" : %u", entity->compound_member.bit_size);
1406 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1413 * Prints an expression.
1415 * @param expression the expression
1417 void print_expression(const expression_t *expression)
1419 print_expression_prec(expression, PREC_BOTTOM);
1423 * Print a declaration.
1425 * @param declaration the declaration
1427 void print_entity(const entity_t *entity)
1429 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1432 switch ((entity_kind_tag_t)entity->kind) {
1433 case ENTITY_VARIABLE:
1434 case ENTITY_PARAMETER:
1435 case ENTITY_COMPOUND_MEMBER:
1436 case ENTITY_FUNCTION:
1437 print_declaration(entity);
1439 case ENTITY_TYPEDEF:
1440 print_typedef(entity);
1444 print_string("class ");
1445 print_string(entity->base.symbol->string);
1446 print_string("; /* TODO */\n");
1449 print_string("struct ");
1450 goto print_compound;
1452 print_string("union ");
1454 print_string(entity->base.symbol->string);
1455 if (entity->compound.complete) {
1457 print_compound_definition(&entity->compound);
1462 print_string("enum ");
1463 print_string(entity->base.symbol->string);
1465 print_enum_definition(&entity->enume);
1468 case ENTITY_NAMESPACE:
1469 print_namespace(&entity->namespacee);
1471 case ENTITY_LOCAL_LABEL:
1472 print_string("__label__ ");
1473 print_string(entity->base.symbol->string);
1477 case ENTITY_ENUM_VALUE:
1478 panic("print_entity used on unexpected entity type");
1480 panic("Invalid entity type encountered");
1484 * Print the AST of a translation unit.
1486 * @param unit the translation unit
1488 void print_ast(const translation_unit_t *unit)
1490 entity_t *entity = unit->scope.entities;
1491 for ( ; entity != NULL; entity = entity->base.next) {
1492 if (entity->kind == ENTITY_ENUM_VALUE)
1494 if (entity->base.namespc != NAMESPACE_NORMAL
1495 && entity->base.symbol == NULL)
1497 if (is_generated_entity(entity))
1501 print_entity(entity);
1506 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1508 switch (initializer->kind) {
1509 case INITIALIZER_STRING:
1510 case INITIALIZER_WIDE_STRING:
1511 case INITIALIZER_DESIGNATOR:
1512 return EXPR_CLASS_CONSTANT;
1514 case INITIALIZER_VALUE:
1515 return is_linker_constant(initializer->value.value);
1517 case INITIALIZER_LIST: {
1518 expression_classification_t all = EXPR_CLASS_CONSTANT;
1519 for (size_t i = 0; i < initializer->list.len; ++i) {
1520 initializer_t *sub_initializer = initializer->list.initializers[i];
1521 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1529 panic("invalid initializer kind found");
1533 * Checks if an expression references an object with a constant/known location
1534 * to the linker. Example:
1535 * - "x", "*&x" with x being a global variable. The value of x need not be
1536 * constant but the address of x is.
1537 * - "a.b.c" when a has a constant/known location to the linker
1539 static expression_classification_t is_object_with_linker_constant_address(
1540 const expression_t *expression)
1542 switch (expression->kind) {
1543 case EXPR_UNARY_DEREFERENCE:
1544 return is_linker_constant(expression->unary.value);
1547 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1548 if (is_type_pointer(base_type)) {
1550 return is_linker_constant(expression->select.compound);
1552 return is_object_with_linker_constant_address(expression->select.compound);
1556 case EXPR_ARRAY_ACCESS: {
1557 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1558 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1559 return ref < idx ? ref : idx;
1562 case EXPR_REFERENCE: {
1563 entity_t *entity = expression->reference.entity;
1564 if (!is_declaration(entity))
1565 return EXPR_CLASS_VARIABLE;
1567 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1568 case STORAGE_CLASS_NONE:
1569 case STORAGE_CLASS_EXTERN:
1570 case STORAGE_CLASS_STATIC:
1572 entity->kind != ENTITY_VARIABLE ||
1573 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1574 EXPR_CLASS_VARIABLE;
1576 case STORAGE_CLASS_REGISTER:
1577 case STORAGE_CLASS_TYPEDEF:
1578 case STORAGE_CLASS_AUTO:
1581 return EXPR_CLASS_VARIABLE;
1585 return EXPR_CLASS_ERROR;
1588 return EXPR_CLASS_VARIABLE;
1592 expression_classification_t is_linker_constant(const expression_t *expression)
1594 switch (expression->kind) {
1595 case EXPR_STRING_LITERAL:
1597 case EXPR_LABEL_ADDRESS:
1598 return EXPR_CLASS_CONSTANT;
1600 case EXPR_COMPOUND_LITERAL:
1601 return is_constant_initializer(expression->compound_literal.initializer);
1603 case EXPR_UNARY_TAKE_ADDRESS:
1604 return is_object_with_linker_constant_address(expression->unary.value);
1606 case EXPR_UNARY_DEREFERENCE: {
1608 = revert_automatic_type_conversion(expression->unary.value);
1609 /* dereferencing a function is a NOP */
1610 if (is_type_function(real_type)) {
1611 return is_linker_constant(expression->unary.value);
1616 case EXPR_UNARY_CAST: {
1617 type_t *dest = skip_typeref(expression->base.type);
1618 if (!is_type_pointer(dest) && (
1619 dest->kind != TYPE_ATOMIC ||
1620 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1621 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1623 return is_constant_expression(expression);
1625 return is_linker_constant(expression->unary.value);
1628 case EXPR_BINARY_ADD:
1629 case EXPR_BINARY_SUB: {
1630 expression_t *const left = expression->binary.left;
1631 expression_t *const right = expression->binary.right;
1632 type_t *const ltype = skip_typeref(left->base.type);
1633 type_t *const rtype = skip_typeref(right->base.type);
1635 if (is_type_pointer(ltype)) {
1636 expression_classification_t const l = is_linker_constant(left);
1637 expression_classification_t const r = is_constant_expression(right);
1638 return l < r ? l : r;
1639 } else if (is_type_pointer(rtype)) {
1640 expression_classification_t const l = is_constant_expression(left);
1641 expression_classification_t const r = is_linker_constant(right);
1642 return l < r ? l : r;
1643 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1644 return EXPR_CLASS_ERROR;
1646 return is_constant_expression(expression);
1650 case EXPR_REFERENCE: {
1651 entity_t *entity = expression->reference.entity;
1652 if (!is_declaration(entity))
1653 return EXPR_CLASS_VARIABLE;
1655 type_t *type = skip_typeref(entity->declaration.type);
1656 if (is_type_function(type))
1657 return EXPR_CLASS_CONSTANT;
1658 if (is_type_array(type)) {
1659 return is_object_with_linker_constant_address(expression);
1661 /* Prevent stray errors */
1662 if (!is_type_valid(type))
1663 return EXPR_CLASS_ERROR;
1664 return EXPR_CLASS_VARIABLE;
1667 case EXPR_ARRAY_ACCESS: {
1668 type_t *const type =
1669 skip_typeref(revert_automatic_type_conversion(expression));
1670 if (!is_type_array(type))
1671 return EXPR_CLASS_VARIABLE;
1672 return is_linker_constant(expression->array_access.array_ref);
1675 case EXPR_CONDITIONAL: {
1676 expression_t *const c = expression->conditional.condition;
1677 expression_classification_t const cclass = is_constant_expression(c);
1678 if (cclass != EXPR_CLASS_CONSTANT)
1681 if (fold_constant_to_bool(c)) {
1682 expression_t const *const t = expression->conditional.true_expression;
1683 return is_linker_constant(t != NULL ? t : c);
1685 return is_linker_constant(expression->conditional.false_expression);
1690 entity_t *entity = expression->select.compound_entry;
1691 if (!is_declaration(entity))
1692 return EXPR_CLASS_VARIABLE;
1693 type_t *type = skip_typeref(entity->declaration.type);
1694 if (is_type_array(type)) {
1695 /* arrays automatically convert to their address */
1696 expression_t *compound = expression->select.compound;
1697 type_t *base_type = skip_typeref(compound->base.type);
1698 if (is_type_pointer(base_type)) {
1700 return is_linker_constant(compound);
1702 return is_object_with_linker_constant_address(compound);
1705 return EXPR_CLASS_VARIABLE;
1709 return is_constant_expression(expression);
1714 * Check if the given expression is a call to a builtin function
1715 * returning a constant result.
1717 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1719 expression_t *function = expression->call.function;
1720 if (function->kind != EXPR_REFERENCE)
1721 return EXPR_CLASS_VARIABLE;
1722 reference_expression_t *ref = &function->reference;
1723 if (ref->entity->kind != ENTITY_FUNCTION)
1724 return EXPR_CLASS_VARIABLE;
1726 switch (ref->entity->function.btk) {
1729 return EXPR_CLASS_CONSTANT;
1731 return EXPR_CLASS_VARIABLE;
1736 static expression_classification_t is_constant_pointer(const expression_t *expression)
1738 expression_classification_t const expr_class = is_constant_expression(expression);
1739 if (expr_class != EXPR_CLASS_VARIABLE)
1742 switch (expression->kind) {
1743 case EXPR_UNARY_CAST:
1744 return is_constant_pointer(expression->unary.value);
1746 return EXPR_CLASS_VARIABLE;
1750 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1752 switch (expression->kind) {
1754 expression_t *compound = expression->select.compound;
1755 type_t *compound_type = compound->base.type;
1756 compound_type = skip_typeref(compound_type);
1757 if (is_type_pointer(compound_type)) {
1758 return is_constant_pointer(compound);
1760 return is_object_with_constant_address(compound);
1764 case EXPR_ARRAY_ACCESS: {
1765 array_access_expression_t const* const array_access =
1766 &expression->array_access;
1767 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1768 if (idx_class != EXPR_CLASS_CONSTANT)
1770 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1771 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1772 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1775 case EXPR_UNARY_DEREFERENCE:
1776 return is_constant_pointer(expression->unary.value);
1779 return EXPR_CLASS_ERROR;
1782 return EXPR_CLASS_VARIABLE;
1786 expression_classification_t is_constant_expression(const expression_t *expression)
1788 switch (expression->kind) {
1789 case EXPR_LITERAL_CASES:
1790 case EXPR_LITERAL_CHARACTER:
1791 case EXPR_LITERAL_WIDE_CHARACTER:
1792 case EXPR_CLASSIFY_TYPE:
1795 case EXPR_BUILTIN_CONSTANT_P:
1796 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1797 case EXPR_ENUM_CONSTANT:
1798 return EXPR_CLASS_CONSTANT;
1801 type_t *const type = skip_typeref(expression->typeprop.type);
1803 !is_type_array(type) || !type->array.is_vla ? EXPR_CLASS_CONSTANT :
1804 EXPR_CLASS_VARIABLE;
1807 case EXPR_STRING_LITERAL:
1809 case EXPR_LABEL_ADDRESS:
1814 case EXPR_STATEMENT:
1815 case EXPR_UNARY_POSTFIX_INCREMENT:
1816 case EXPR_UNARY_POSTFIX_DECREMENT:
1817 case EXPR_UNARY_PREFIX_INCREMENT:
1818 case EXPR_UNARY_PREFIX_DECREMENT:
1819 case EXPR_UNARY_ASSUME: /* has VOID type */
1820 case EXPR_UNARY_DEREFERENCE:
1821 case EXPR_UNARY_DELETE:
1822 case EXPR_UNARY_DELETE_ARRAY:
1823 case EXPR_UNARY_THROW:
1824 case EXPR_BINARY_ASSIGN:
1825 case EXPR_BINARY_MUL_ASSIGN:
1826 case EXPR_BINARY_DIV_ASSIGN:
1827 case EXPR_BINARY_MOD_ASSIGN:
1828 case EXPR_BINARY_ADD_ASSIGN:
1829 case EXPR_BINARY_SUB_ASSIGN:
1830 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1831 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1832 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1833 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1834 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1835 case EXPR_BINARY_COMMA:
1836 case EXPR_ARRAY_ACCESS:
1837 return EXPR_CLASS_VARIABLE;
1839 case EXPR_REFERENCE: {
1840 type_t *const type = skip_typeref(expression->base.type);
1841 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1844 case EXPR_UNARY_TAKE_ADDRESS:
1845 return is_object_with_constant_address(expression->unary.value);
1848 return is_builtin_const_call(expression);
1850 case EXPR_UNARY_NEGATE:
1851 case EXPR_UNARY_PLUS:
1852 case EXPR_UNARY_BITWISE_NEGATE:
1853 case EXPR_UNARY_NOT:
1854 return is_constant_expression(expression->unary.value);
1856 case EXPR_UNARY_CAST: {
1857 type_t *const type = skip_typeref(expression->base.type);
1858 if (is_type_scalar(type))
1859 return is_constant_expression(expression->unary.value);
1860 if (!is_type_valid(type))
1861 return EXPR_CLASS_ERROR;
1862 return EXPR_CLASS_VARIABLE;
1865 case EXPR_BINARY_ADD:
1866 case EXPR_BINARY_SUB:
1867 case EXPR_BINARY_MUL:
1868 case EXPR_BINARY_DIV:
1869 case EXPR_BINARY_MOD:
1870 case EXPR_BINARY_EQUAL:
1871 case EXPR_BINARY_NOTEQUAL:
1872 case EXPR_BINARY_LESS:
1873 case EXPR_BINARY_LESSEQUAL:
1874 case EXPR_BINARY_GREATER:
1875 case EXPR_BINARY_GREATEREQUAL:
1876 case EXPR_BINARY_BITWISE_AND:
1877 case EXPR_BINARY_BITWISE_OR:
1878 case EXPR_BINARY_BITWISE_XOR:
1879 case EXPR_BINARY_SHIFTLEFT:
1880 case EXPR_BINARY_SHIFTRIGHT:
1881 case EXPR_BINARY_ISGREATER:
1882 case EXPR_BINARY_ISGREATEREQUAL:
1883 case EXPR_BINARY_ISLESS:
1884 case EXPR_BINARY_ISLESSEQUAL:
1885 case EXPR_BINARY_ISLESSGREATER:
1886 case EXPR_BINARY_ISUNORDERED: {
1887 expression_classification_t const l = is_constant_expression(expression->binary.left);
1888 expression_classification_t const r = is_constant_expression(expression->binary.right);
1889 return l < r ? l : r;
1892 case EXPR_BINARY_LOGICAL_AND: {
1893 expression_t const *const left = expression->binary.left;
1894 expression_classification_t const lclass = is_constant_expression(left);
1895 if (lclass != EXPR_CLASS_CONSTANT)
1897 if (!fold_constant_to_bool(left))
1898 return EXPR_CLASS_CONSTANT;
1899 return is_constant_expression(expression->binary.right);
1902 case EXPR_BINARY_LOGICAL_OR: {
1903 expression_t const *const left = expression->binary.left;
1904 expression_classification_t const lclass = is_constant_expression(left);
1905 if (lclass != EXPR_CLASS_CONSTANT)
1907 if (fold_constant_to_bool(left))
1908 return EXPR_CLASS_CONSTANT;
1909 return is_constant_expression(expression->binary.right);
1912 case EXPR_COMPOUND_LITERAL:
1913 return is_constant_initializer(expression->compound_literal.initializer);
1915 case EXPR_CONDITIONAL: {
1916 expression_t *const condition = expression->conditional.condition;
1917 expression_classification_t const cclass = is_constant_expression(condition);
1918 if (cclass != EXPR_CLASS_CONSTANT)
1921 if (fold_constant_to_bool(condition)) {
1922 expression_t const *const t = expression->conditional.true_expression;
1923 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1925 return is_constant_expression(expression->conditional.false_expression);
1930 return EXPR_CLASS_ERROR;
1932 panic("invalid expression found (is constant expression)");
1937 obstack_init(&ast_obstack);
1942 obstack_free(&ast_obstack, NULL);