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_WIDE_STRING_LITERAL] = PREC_PRIMARY,
114 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
115 [EXPR_CALL] = PREC_POSTFIX,
116 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
117 [EXPR_SELECT] = PREC_POSTFIX,
118 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
119 [EXPR_SIZEOF] = PREC_UNARY,
120 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
121 [EXPR_ALIGNOF] = PREC_UNARY,
123 [EXPR_FUNCNAME] = PREC_PRIMARY,
124 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
125 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
126 [EXPR_OFFSETOF] = PREC_PRIMARY,
127 [EXPR_VA_START] = PREC_PRIMARY,
128 [EXPR_VA_ARG] = PREC_PRIMARY,
129 [EXPR_VA_COPY] = PREC_PRIMARY,
130 [EXPR_STATEMENT] = PREC_PRIMARY,
131 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
133 [EXPR_UNARY_NEGATE] = PREC_UNARY,
134 [EXPR_UNARY_PLUS] = PREC_UNARY,
135 [EXPR_UNARY_BITWISE_NEGATE] = PREC_UNARY,
136 [EXPR_UNARY_NOT] = PREC_UNARY,
137 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
138 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
139 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
140 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
141 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
142 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
143 [EXPR_UNARY_CAST] = PREC_UNARY,
144 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
145 [EXPR_UNARY_DELETE] = PREC_UNARY,
146 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
147 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
149 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
150 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
151 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
152 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
153 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
154 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
155 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
156 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
157 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
158 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
159 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
160 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
161 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
162 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
163 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
164 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
165 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
166 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
167 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
168 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
169 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
170 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
171 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
172 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
173 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
174 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
175 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
176 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
177 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
178 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
180 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
181 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
182 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
183 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
184 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
185 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
187 assert((size_t)kind < lengthof(prec));
188 unsigned res = prec[kind];
190 assert(res != PREC_BOTTOM);
195 * Print a quoted string constant.
197 * @param string the string constant
198 * @param border the border char
199 * @param skip number of chars to skip at the end
201 static void print_quoted_string(const string_t *const string, char border,
205 const char *end = string->begin + string->size - skip;
206 for (const char *c = string->begin; c != end; ++c) {
212 case '\\': print_string("\\\\"); break;
213 case '\a': print_string("\\a"); break;
214 case '\b': print_string("\\b"); break;
215 case '\f': print_string("\\f"); break;
216 case '\n': print_string("\\n"); break;
217 case '\r': print_string("\\r"); break;
218 case '\t': print_string("\\t"); break;
219 case '\v': print_string("\\v"); break;
220 case '\?': print_string("\\?"); break;
222 if (c_mode & _GNUC) {
223 print_string("\\e"); break;
227 if ((unsigned)tc < 0x80 && !isprint(tc)) {
228 print_format("\\%03o", (unsigned)tc);
238 static void print_string_literal(const string_literal_expression_t *literal)
240 if (literal->base.kind == EXPR_WIDE_STRING_LITERAL) {
243 print_quoted_string(&literal->value, '"', 1);
246 static void print_literal(const literal_expression_t *literal)
248 switch (literal->base.kind) {
249 case EXPR_LITERAL_MS_NOOP:
250 print_string("__noop");
253 case EXPR_LITERAL_BOOLEAN:
254 case EXPR_LITERAL_FLOATINGPOINT:
255 case EXPR_LITERAL_INTEGER:
256 print_stringrep(&literal->value);
257 print_stringrep(&literal->suffix);
260 case EXPR_LITERAL_WIDE_CHARACTER:
263 case EXPR_LITERAL_CHARACTER:
264 print_quoted_string(&literal->value, '\'', 0);
269 print_string("INVALID LITERAL KIND");
273 * Prints a predefined symbol.
275 static void print_funcname(const funcname_expression_t *funcname)
278 switch (funcname->kind) {
279 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
280 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
281 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
282 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
287 static void print_compound_literal(
288 const compound_literal_expression_t *expression)
291 print_type(expression->type);
293 print_initializer(expression->initializer);
296 static void print_assignment_expression(const expression_t *const expr)
298 print_expression_prec(expr, PREC_ASSIGNMENT);
302 * Prints a call expression.
304 * @param call the call expression
306 static void print_call_expression(const call_expression_t *call)
308 print_expression_prec(call->function, PREC_POSTFIX);
310 char const *sep = "";
311 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
314 print_assignment_expression(arg->expression);
320 * Prints a binary expression.
322 * @param binexpr the binary expression
324 static void print_binary_expression(const binary_expression_t *binexpr)
326 unsigned prec = get_expression_precedence(binexpr->base.kind);
327 int r2l = right_to_left(prec);
329 print_expression_prec(binexpr->left, prec + r2l);
331 switch (binexpr->base.kind) {
332 case EXPR_BINARY_COMMA: op = ", "; break;
333 case EXPR_BINARY_ASSIGN: op = " = "; break;
334 case EXPR_BINARY_ADD: op = " + "; break;
335 case EXPR_BINARY_SUB: op = " - "; break;
336 case EXPR_BINARY_MUL: op = " * "; break;
337 case EXPR_BINARY_MOD: op = " % "; break;
338 case EXPR_BINARY_DIV: op = " / "; break;
339 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
340 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
341 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
342 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
343 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
344 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
345 case EXPR_BINARY_EQUAL: op = " == "; break;
346 case EXPR_BINARY_LESS: op = " < "; break;
347 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
348 case EXPR_BINARY_GREATER: op = " > "; break;
349 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
350 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
351 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
353 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
354 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
355 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
356 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
357 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
358 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
359 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
360 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
361 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
362 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
363 default: panic("invalid binexpression found");
366 print_expression_prec(binexpr->right, prec + 1 - r2l);
370 * Prints an unary expression.
372 * @param unexpr the unary expression
374 static void print_unary_expression(const unary_expression_t *unexpr)
376 unsigned prec = get_expression_precedence(unexpr->base.kind);
377 switch (unexpr->base.kind) {
378 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
379 case EXPR_UNARY_PLUS: print_char ('+' ); break;
380 case EXPR_UNARY_NOT: print_char ('!' ); break;
381 case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;
382 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
383 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
384 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
385 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
386 case EXPR_UNARY_DELETE: print_string("delete "); break;
387 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
389 case EXPR_UNARY_POSTFIX_INCREMENT:
390 print_expression_prec(unexpr->value, prec);
393 case EXPR_UNARY_POSTFIX_DECREMENT:
394 print_expression_prec(unexpr->value, prec);
397 case EXPR_UNARY_CAST:
399 print_type(unexpr->base.type);
402 case EXPR_UNARY_ASSUME:
403 print_string("__assume(");
404 print_assignment_expression(unexpr->value);
408 case EXPR_UNARY_THROW:
409 if (unexpr->value == NULL) {
410 print_string("throw");
413 print_string("throw ");
417 panic("invalid unary expression found");
419 print_expression_prec(unexpr->value, prec);
423 * Prints a reference expression.
425 * @param ref the reference expression
427 static void print_reference_expression(const reference_expression_t *ref)
429 print_string(ref->entity->base.symbol->string);
433 * Prints a label address expression.
435 * @param ref the reference expression
437 static void print_label_address_expression(const label_address_expression_t *le)
439 print_format("&&%s", le->label->base.symbol->string);
443 * Prints an array expression.
445 * @param expression the array expression
447 static void print_array_expression(const array_access_expression_t *expression)
449 if (!expression->flipped) {
450 print_expression_prec(expression->array_ref, PREC_POSTFIX);
452 print_expression(expression->index);
455 print_expression_prec(expression->index, PREC_POSTFIX);
457 print_expression(expression->array_ref);
463 * Prints a typeproperty expression (sizeof or __alignof__).
465 * @param expression the type property expression
467 static void print_typeprop_expression(const typeprop_expression_t *expression)
469 if (expression->base.kind == EXPR_SIZEOF) {
470 print_string("sizeof");
472 assert(expression->base.kind == EXPR_ALIGNOF);
473 print_string("__alignof__");
475 if (expression->tp_expression != NULL) {
476 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
477 print_expression_prec(expression->tp_expression, PREC_TOP);
480 print_type(expression->type);
486 * Prints a builtin constant expression.
488 * @param expression the builtin constant expression
490 static void print_builtin_constant(const builtin_constant_expression_t *expression)
492 print_string("__builtin_constant_p(");
493 print_assignment_expression(expression->value);
498 * Prints a builtin types compatible expression.
500 * @param expression the builtin types compatible expression
502 static void print_builtin_types_compatible(
503 const builtin_types_compatible_expression_t *expression)
505 print_string("__builtin_types_compatible_p(");
506 print_type(expression->left);
508 print_type(expression->right);
513 * Prints a conditional expression.
515 * @param expression the conditional expression
517 static void print_conditional(const conditional_expression_t *expression)
519 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
520 if (expression->true_expression != NULL) {
522 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
525 print_string(" ?: ");
527 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
528 print_expression_prec(expression->false_expression, prec);
532 * Prints a va_start expression.
534 * @param expression the va_start expression
536 static void print_va_start(const va_start_expression_t *const expression)
538 print_string("__builtin_va_start(");
539 print_assignment_expression(expression->ap);
541 print_string(expression->parameter->base.base.symbol->string);
546 * Prints a va_arg expression.
548 * @param expression the va_arg expression
550 static void print_va_arg(const va_arg_expression_t *expression)
552 print_string("__builtin_va_arg(");
553 print_assignment_expression(expression->ap);
555 print_type(expression->base.type);
560 * Prints a va_copy expression.
562 * @param expression the va_copy expression
564 static void print_va_copy(const va_copy_expression_t *expression)
566 print_string("__builtin_va_copy(");
567 print_assignment_expression(expression->dst);
569 print_assignment_expression(expression->src);
574 * Prints a select expression (. or ->).
576 * @param expression the select expression
578 static void print_select(const select_expression_t *expression)
580 print_expression_prec(expression->compound, PREC_POSTFIX);
581 /* do not print anything for anonymous struct/union selects
582 * FIXME: if the anonymous select was a '->' this will print '.'
584 if (expression->compound_entry->base.symbol == NULL)
587 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
592 print_string(expression->compound_entry->base.symbol->string);
596 * Prints a type classify expression.
598 * @param expr the type classify expression
600 static void print_classify_type_expression(
601 const classify_type_expression_t *const expr)
603 print_string("__builtin_classify_type(");
604 print_assignment_expression(expr->type_expression);
609 * Prints a designator.
611 * @param designator the designator
613 static void print_designator(const designator_t *designator)
615 for ( ; designator != NULL; designator = designator->next) {
616 if (designator->symbol == NULL) {
618 print_expression(designator->array_index);
622 print_string(designator->symbol->string);
628 * Prints an offsetof expression.
630 * @param expression the offset expression
632 static void print_offsetof_expression(const offsetof_expression_t *expression)
634 print_string("__builtin_offsetof(");
635 print_type(expression->type);
637 print_designator(expression->designator);
642 * Prints a statement expression.
644 * @param expression the statement expression
646 static void print_statement_expression(const statement_expression_t *expression)
649 print_statement(expression->statement);
653 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
655 if (expr->base.parenthesized)
658 if (top_prec > get_expression_precedence(expr->base.kind))
661 if (print_parenthesis && top_prec != PREC_BOTTOM) {
662 switch (expr->kind) {
663 case EXPR_ENUM_CONSTANT:
665 case EXPR_LITERAL_CASES:
667 case EXPR_STRING_LITERAL:
668 case EXPR_WIDE_STRING_LITERAL:
669 /* Do not print () around subexpressions consisting of a single token. */
681 * Prints an expression with parenthesis if needed.
683 * @param expression the expression to print
684 * @param top_prec the precedence of the user of this expression.
686 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
688 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
689 expr = expr->unary.value;
692 bool const parenthesized = needs_parentheses(expr, top_prec);
696 switch (expr->kind) {
698 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
699 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
700 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
701 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
702 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
703 case EXPR_CALL: print_call_expression( &expr->call); break;
704 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
705 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
706 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
707 case EXPR_ERROR: print_string("$error$"); break;
708 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
709 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
710 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
711 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
713 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
714 case EXPR_SELECT: print_select( &expr->select); break;
715 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
716 case EXPR_STRING_LITERAL:
717 case EXPR_WIDE_STRING_LITERAL: print_string_literal( &expr->string_literal); break;
718 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
719 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
720 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
721 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
727 static void print_indented_statement(statement_t const *const stmt)
729 switch (stmt->kind) {
730 case STATEMENT_LABEL:
733 case STATEMENT_CASE_LABEL:
734 for (int i = 0; i != case_indent; ++i)
742 print_statement(stmt);
746 * Print an compound statement.
748 * @param block the compound statement
750 static void print_compound_statement(const compound_statement_t *block)
755 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
756 print_indented_statement(stmt);
766 * Print a return statement.
768 * @param statement the return statement
770 static void print_return_statement(const return_statement_t *statement)
772 expression_t const *const val = statement->value;
774 print_string("return ");
775 print_expression(val);
778 print_string("return;");
783 * Print an expression statement.
785 * @param statement the expression statement
787 static void print_expression_statement(const expression_statement_t *statement)
789 print_expression(statement->expression);
794 * Print a computed goto statement.
796 * @param statement the computed goto statement
798 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
800 print_string("goto *");
801 print_expression(stmt->expression);
806 * Print a goto statement.
808 * @param statement the goto statement
810 static void print_goto_statement(const goto_statement_t *statement)
812 print_string("goto ");
813 print_string(statement->label->base.symbol->string);
818 * Print a label statement.
820 * @param statement the label statement
822 static void print_label_statement(const label_statement_t *statement)
824 print_format("%s:\n", statement->label->base.symbol->string);
825 print_indented_statement(statement->statement);
828 static void print_inner_statement(statement_t const *const stmt)
830 if (stmt->kind == STATEMENT_COMPOUND) {
832 print_compound_statement(&stmt->compound);
836 print_indented_statement(stmt);
841 static void print_after_inner_statement(statement_t const *const stmt)
843 if (stmt->kind == STATEMENT_COMPOUND) {
852 * Print an if statement.
854 * @param statement the if statement
856 static void print_if_statement(const if_statement_t *statement)
858 print_string("if (");
859 print_expression(statement->condition);
861 print_inner_statement(statement->true_statement);
863 statement_t const *const f = statement->false_statement;
865 print_after_inner_statement(statement->true_statement);
866 print_string("else");
867 if (f->kind == STATEMENT_IF) {
869 print_if_statement(&f->ifs);
871 print_inner_statement(f);
877 * Print a switch statement.
879 * @param statement the switch statement
881 static void print_switch_statement(const switch_statement_t *statement)
883 int const old_case_indent = case_indent;
884 case_indent = indent;
886 print_string("switch (");
887 print_expression(statement->expression);
889 print_inner_statement(statement->body);
891 case_indent = old_case_indent;
895 * Print a case label (including the default label).
897 * @param statement the case label statement
899 static void print_case_label(const case_label_statement_t *statement)
901 if (statement->expression == NULL) {
902 print_string("default:\n");
904 print_string("case ");
905 print_expression(statement->expression);
906 if (statement->end_range != NULL) {
907 print_string(" ... ");
908 print_expression(statement->end_range);
912 print_indented_statement(statement->statement);
915 static void print_typedef(const entity_t *entity)
917 print_string("typedef ");
918 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
923 * returns true if the entity is a compiler generated one and has no real
924 * correspondenc in the source file
926 static bool is_generated_entity(const entity_t *entity)
928 if (entity->kind == ENTITY_TYPEDEF)
929 return entity->typedefe.builtin;
931 if (is_declaration(entity))
932 return entity->declaration.implicit;
938 * Print a declaration statement.
940 * @param statement the statement
942 static void print_declaration_statement(
943 const declaration_statement_t *statement)
946 entity_t *entity = statement->declarations_begin;
947 if (entity == NULL) {
948 print_string("/* empty declaration statement */");
952 entity_t *const end = statement->declarations_end->base.next;
953 for (; entity != end; entity = entity->base.next) {
954 if (entity->kind == ENTITY_ENUM_VALUE)
956 if (is_generated_entity(entity))
966 print_entity(entity);
971 * Print a while statement.
973 * @param statement the statement
975 static void print_while_statement(const while_statement_t *statement)
977 print_string("while (");
978 print_expression(statement->condition);
980 print_inner_statement(statement->body);
984 * Print a do-while statement.
986 * @param statement the statement
988 static void print_do_while_statement(const do_while_statement_t *statement)
991 print_inner_statement(statement->body);
992 print_after_inner_statement(statement->body);
993 print_string("while (");
994 print_expression(statement->condition);
999 * Print a for statement.
1001 * @param statement the statement
1003 static void print_for_statement(const for_statement_t *statement)
1005 print_string("for (");
1006 if (statement->initialisation != NULL) {
1007 print_expression(statement->initialisation);
1010 entity_t const *entity = statement->scope.entities;
1011 for (; entity != NULL; entity = entity->base.next) {
1012 if (is_generated_entity(entity))
1014 /* FIXME display of multiple declarations is wrong */
1015 print_declaration(entity);
1018 if (statement->condition != NULL) {
1020 print_expression(statement->condition);
1023 if (statement->step != NULL) {
1025 print_expression(statement->step);
1028 print_inner_statement(statement->body);
1032 * Print assembler arguments.
1034 * @param arguments the arguments
1036 static void print_asm_arguments(asm_argument_t *arguments)
1038 asm_argument_t *argument = arguments;
1039 for (; argument != NULL; argument = argument->next) {
1040 if (argument != arguments)
1043 if (argument->symbol) {
1044 print_format("[%s] ", argument->symbol->string);
1046 print_quoted_string(&argument->constraints, '"', 1);
1048 print_expression(argument->expression);
1054 * Print assembler clobbers.
1056 * @param clobbers the clobbers
1058 static void print_asm_clobbers(asm_clobber_t *clobbers)
1060 asm_clobber_t *clobber = clobbers;
1061 for (; clobber != NULL; clobber = clobber->next) {
1062 if (clobber != clobbers)
1065 print_quoted_string(&clobber->clobber, '"', 1);
1070 * Print an assembler statement.
1072 * @param statement the statement
1074 static void print_asm_statement(const asm_statement_t *statement)
1076 print_string("asm ");
1077 if (statement->is_volatile) {
1078 print_string("volatile ");
1081 print_quoted_string(&statement->asm_text, '"', 1);
1082 if (statement->outputs == NULL &&
1083 statement->inputs == NULL &&
1084 statement->clobbers == NULL)
1085 goto end_of_print_asm_statement;
1087 print_string(" : ");
1088 print_asm_arguments(statement->outputs);
1089 if (statement->inputs == NULL && statement->clobbers == NULL)
1090 goto end_of_print_asm_statement;
1092 print_string(" : ");
1093 print_asm_arguments(statement->inputs);
1094 if (statement->clobbers == NULL)
1095 goto end_of_print_asm_statement;
1097 print_string(" : ");
1098 print_asm_clobbers(statement->clobbers);
1100 end_of_print_asm_statement:
1105 * Print a microsoft __try statement.
1107 * @param statement the statement
1109 static void print_ms_try_statement(const ms_try_statement_t *statement)
1111 print_string("__try");
1112 print_inner_statement(statement->try_statement);
1113 print_after_inner_statement(statement->try_statement);
1114 if (statement->except_expression != NULL) {
1115 print_string("__except(");
1116 print_expression(statement->except_expression);
1119 print_string("__finally");
1121 print_inner_statement(statement->final_statement);
1125 * Print a microsoft __leave statement.
1127 * @param statement the statement
1129 static void print_leave_statement(const leave_statement_t *statement)
1132 print_string("__leave;");
1136 * Print a statement.
1138 * @param statement the statement
1140 void print_statement(statement_t const *const stmt)
1142 switch (stmt->kind) {
1143 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1144 case STATEMENT_BREAK: print_string("break;"); break;
1145 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1146 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1147 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1148 case STATEMENT_CONTINUE: print_string("continue;"); break;
1149 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1150 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1151 case STATEMENT_EMPTY: print_char(';'); break;
1152 case STATEMENT_ERROR: print_string("$error statement$"); break;
1153 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1154 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1155 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1156 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1157 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1158 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1159 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1160 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1161 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1162 case STATEMENT_WHILE: print_while_statement( &stmt->whiles); break;
1167 * Print a storage class.
1169 * @param storage_class the storage class
1171 static void print_storage_class(storage_class_tag_t storage_class)
1173 switch (storage_class) {
1174 case STORAGE_CLASS_NONE: return;
1175 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1176 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1177 case STORAGE_CLASS_STATIC: print_string("static "); return;
1178 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1179 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1181 panic("invalid storage class");
1185 * Print an initializer.
1187 * @param initializer the initializer
1189 void print_initializer(const initializer_t *initializer)
1191 if (initializer == NULL) {
1196 switch (initializer->kind) {
1197 case INITIALIZER_VALUE: {
1198 const initializer_value_t *value = &initializer->value;
1199 print_assignment_expression(value->value);
1202 case INITIALIZER_LIST: {
1203 assert(initializer->kind == INITIALIZER_LIST);
1205 const initializer_list_t *list = &initializer->list;
1207 for (size_t i = 0 ; i < list->len; ++i) {
1208 const initializer_t *sub_init = list->initializers[i];
1209 print_initializer(list->initializers[i]);
1210 if (i < list->len-1) {
1211 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1218 case INITIALIZER_STRING:
1219 print_quoted_string(&initializer->string.string, '"', 1);
1221 case INITIALIZER_WIDE_STRING:
1222 print_quoted_string(&initializer->string.string, '"', 1);
1224 case INITIALIZER_DESIGNATOR:
1225 print_designator(initializer->designator.designator);
1226 print_string(" = ");
1230 panic("invalid initializer kind found");
1235 * Print microsoft extended declaration modifiers.
1237 static void print_ms_modifiers(const declaration_t *declaration)
1239 if ((c_mode & _MS) == 0)
1242 decl_modifiers_t modifiers = declaration->modifiers;
1244 bool ds_shown = false;
1245 const char *next = "(";
1247 if (declaration->base.kind == ENTITY_VARIABLE) {
1248 variable_t *variable = (variable_t*)declaration;
1249 if (variable->alignment != 0
1250 || variable->get_property_sym != NULL
1251 || variable->put_property_sym != NULL) {
1253 print_string("__declspec");
1257 if (variable->alignment != 0) {
1258 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1260 if (variable->get_property_sym != NULL
1261 || variable->put_property_sym != NULL) {
1263 print_string(next); next = ", "; print_string("property(");
1264 if (variable->get_property_sym != NULL) {
1265 print_format("get=%s", variable->get_property_sym->string);
1268 if (variable->put_property_sym != NULL)
1269 print_format("%sput=%s", comma, variable->put_property_sym->string);
1275 /* DM_FORCEINLINE handled outside. */
1276 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1278 print_string("__declspec");
1281 if (modifiers & DM_DLLIMPORT) {
1282 print_string(next); next = ", "; print_string("dllimport");
1284 if (modifiers & DM_DLLEXPORT) {
1285 print_string(next); next = ", "; print_string("dllexport");
1287 if (modifiers & DM_THREAD) {
1288 print_string(next); next = ", "; print_string("thread");
1290 if (modifiers & DM_NAKED) {
1291 print_string(next); next = ", "; print_string("naked");
1293 if (modifiers & DM_THREAD) {
1294 print_string(next); next = ", "; print_string("thread");
1296 if (modifiers & DM_SELECTANY) {
1297 print_string(next); next = ", "; print_string("selectany");
1299 if (modifiers & DM_NOTHROW) {
1300 print_string(next); next = ", "; print_string("nothrow");
1302 if (modifiers & DM_NORETURN) {
1303 print_string(next); next = ", "; print_string("noreturn");
1305 if (modifiers & DM_NOINLINE) {
1306 print_string(next); next = ", "; print_string("noinline");
1308 if (modifiers & DM_DEPRECATED) {
1309 print_string(next); next = ", "; print_string("deprecated");
1310 if (declaration->deprecated_string != NULL)
1311 print_format("(\"%s\")",
1312 declaration->deprecated_string);
1314 if (modifiers & DM_RESTRICT) {
1315 print_string(next); next = ", "; print_string("restrict");
1317 if (modifiers & DM_NOALIAS) {
1318 print_string(next); next = ", "; print_string("noalias");
1327 static void print_scope(const scope_t *scope)
1329 const entity_t *entity = scope->entities;
1330 for ( ; entity != NULL; entity = entity->base.next) {
1332 print_entity(entity);
1337 static void print_namespace(const namespace_t *namespace)
1339 print_string("namespace ");
1340 if (namespace->base.symbol != NULL) {
1341 print_string(namespace->base.symbol->string);
1345 print_string("{\n");
1348 print_scope(&namespace->members);
1352 print_string("}\n");
1356 * Print a variable or function declaration
1358 void print_declaration(const entity_t *entity)
1360 assert(is_declaration(entity));
1361 const declaration_t *declaration = &entity->declaration;
1363 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1364 if (entity->kind == ENTITY_FUNCTION) {
1365 function_t *function = (function_t*)declaration;
1366 if (function->is_inline) {
1367 if (declaration->modifiers & DM_FORCEINLINE) {
1368 print_string("__forceinline ");
1369 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1370 print_string("__inline ");
1372 print_string("inline ");
1376 //print_ms_modifiers(declaration);
1377 switch (entity->kind) {
1378 case ENTITY_FUNCTION:
1379 print_type_ext(entity->declaration.type, entity->base.symbol,
1380 &entity->function.parameters);
1382 if (entity->function.statement != NULL) {
1384 print_indented_statement(entity->function.statement);
1390 case ENTITY_VARIABLE:
1391 if (entity->variable.thread_local)
1392 print_string("__thread ");
1393 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1394 if (entity->variable.initializer != NULL) {
1395 print_string(" = ");
1396 print_initializer(entity->variable.initializer);
1400 case ENTITY_COMPOUND_MEMBER:
1401 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1402 if (entity->compound_member.bitfield) {
1403 print_format(" : %u", entity->compound_member.bit_size);
1408 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1415 * Prints an expression.
1417 * @param expression the expression
1419 void print_expression(const expression_t *expression)
1421 print_expression_prec(expression, PREC_BOTTOM);
1425 * Print a declaration.
1427 * @param declaration the declaration
1429 void print_entity(const entity_t *entity)
1431 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1434 switch ((entity_kind_tag_t)entity->kind) {
1435 case ENTITY_VARIABLE:
1436 case ENTITY_PARAMETER:
1437 case ENTITY_COMPOUND_MEMBER:
1438 case ENTITY_FUNCTION:
1439 print_declaration(entity);
1441 case ENTITY_TYPEDEF:
1442 print_typedef(entity);
1446 print_string("class ");
1447 print_string(entity->base.symbol->string);
1448 print_string("; /* TODO */\n");
1451 print_string("struct ");
1452 goto print_compound;
1454 print_string("union ");
1456 print_string(entity->base.symbol->string);
1457 if (entity->compound.complete) {
1459 print_compound_definition(&entity->compound);
1464 print_string("enum ");
1465 print_string(entity->base.symbol->string);
1467 print_enum_definition(&entity->enume);
1470 case ENTITY_NAMESPACE:
1471 print_namespace(&entity->namespacee);
1473 case ENTITY_LOCAL_LABEL:
1474 print_string("__label__ ");
1475 print_string(entity->base.symbol->string);
1479 case ENTITY_ENUM_VALUE:
1480 panic("print_entity used on unexpected entity type");
1482 panic("Invalid entity type encountered");
1486 * Print the AST of a translation unit.
1488 * @param unit the translation unit
1490 void print_ast(const translation_unit_t *unit)
1492 entity_t *entity = unit->scope.entities;
1493 for ( ; entity != NULL; entity = entity->base.next) {
1494 if (entity->kind == ENTITY_ENUM_VALUE)
1496 if (entity->base.namespc != NAMESPACE_NORMAL
1497 && entity->base.symbol == NULL)
1499 if (is_generated_entity(entity))
1503 print_entity(entity);
1508 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1510 switch (initializer->kind) {
1511 case INITIALIZER_STRING:
1512 case INITIALIZER_WIDE_STRING:
1513 case INITIALIZER_DESIGNATOR:
1514 return EXPR_CLASS_CONSTANT;
1516 case INITIALIZER_VALUE:
1517 return is_linker_constant(initializer->value.value);
1519 case INITIALIZER_LIST: {
1520 expression_classification_t all = EXPR_CLASS_CONSTANT;
1521 for (size_t i = 0; i < initializer->list.len; ++i) {
1522 initializer_t *sub_initializer = initializer->list.initializers[i];
1523 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1531 panic("invalid initializer kind found");
1535 * Checks if an expression references an object with a constant/known location
1536 * to the linker. Example:
1537 * - "x", "*&x" with x being a global variable. The value of x need not be
1538 * constant but the address of x is.
1539 * - "a.b.c" when a has a constant/known location to the linker
1541 static expression_classification_t is_object_with_linker_constant_address(
1542 const expression_t *expression)
1544 switch (expression->kind) {
1545 case EXPR_UNARY_DEREFERENCE:
1546 return is_linker_constant(expression->unary.value);
1549 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1550 if (is_type_pointer(base_type)) {
1552 return is_linker_constant(expression->select.compound);
1554 return is_object_with_linker_constant_address(expression->select.compound);
1558 case EXPR_ARRAY_ACCESS: {
1559 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1560 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1561 return ref < idx ? ref : idx;
1564 case EXPR_REFERENCE: {
1565 entity_t *entity = expression->reference.entity;
1566 if (!is_declaration(entity))
1567 return EXPR_CLASS_VARIABLE;
1569 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1570 case STORAGE_CLASS_NONE:
1571 case STORAGE_CLASS_EXTERN:
1572 case STORAGE_CLASS_STATIC:
1574 entity->kind != ENTITY_VARIABLE ||
1575 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1576 EXPR_CLASS_VARIABLE;
1578 case STORAGE_CLASS_REGISTER:
1579 case STORAGE_CLASS_TYPEDEF:
1580 case STORAGE_CLASS_AUTO:
1583 return EXPR_CLASS_VARIABLE;
1587 return EXPR_CLASS_ERROR;
1590 return EXPR_CLASS_VARIABLE;
1594 expression_classification_t is_linker_constant(const expression_t *expression)
1596 switch (expression->kind) {
1597 case EXPR_STRING_LITERAL:
1598 case EXPR_WIDE_STRING_LITERAL:
1600 case EXPR_LABEL_ADDRESS:
1601 return EXPR_CLASS_CONSTANT;
1603 case EXPR_COMPOUND_LITERAL:
1604 return is_constant_initializer(expression->compound_literal.initializer);
1606 case EXPR_UNARY_TAKE_ADDRESS:
1607 return is_object_with_linker_constant_address(expression->unary.value);
1609 case EXPR_UNARY_DEREFERENCE: {
1611 = revert_automatic_type_conversion(expression->unary.value);
1612 /* dereferencing a function is a NOP */
1613 if (is_type_function(real_type)) {
1614 return is_linker_constant(expression->unary.value);
1619 case EXPR_UNARY_CAST: {
1620 type_t *dest = skip_typeref(expression->base.type);
1621 if (!is_type_pointer(dest) && (
1622 dest->kind != TYPE_ATOMIC ||
1623 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1624 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1626 return is_constant_expression(expression);
1628 return is_linker_constant(expression->unary.value);
1631 case EXPR_BINARY_ADD:
1632 case EXPR_BINARY_SUB: {
1633 expression_t *const left = expression->binary.left;
1634 expression_t *const right = expression->binary.right;
1635 type_t *const ltype = skip_typeref(left->base.type);
1636 type_t *const rtype = skip_typeref(right->base.type);
1638 if (is_type_pointer(ltype)) {
1639 expression_classification_t const l = is_linker_constant(left);
1640 expression_classification_t const r = is_constant_expression(right);
1641 return l < r ? l : r;
1642 } else if (is_type_pointer(rtype)) {
1643 expression_classification_t const l = is_constant_expression(left);
1644 expression_classification_t const r = is_linker_constant(right);
1645 return l < r ? l : r;
1646 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1647 return EXPR_CLASS_ERROR;
1649 return is_constant_expression(expression);
1653 case EXPR_REFERENCE: {
1654 entity_t *entity = expression->reference.entity;
1655 if (!is_declaration(entity))
1656 return EXPR_CLASS_VARIABLE;
1658 type_t *type = skip_typeref(entity->declaration.type);
1659 if (is_type_function(type))
1660 return EXPR_CLASS_CONSTANT;
1661 if (is_type_array(type)) {
1662 return is_object_with_linker_constant_address(expression);
1664 /* Prevent stray errors */
1665 if (!is_type_valid(type))
1666 return EXPR_CLASS_ERROR;
1667 return EXPR_CLASS_VARIABLE;
1670 case EXPR_ARRAY_ACCESS: {
1671 type_t *const type =
1672 skip_typeref(revert_automatic_type_conversion(expression));
1673 if (!is_type_array(type))
1674 return EXPR_CLASS_VARIABLE;
1675 return is_linker_constant(expression->array_access.array_ref);
1678 case EXPR_CONDITIONAL: {
1679 expression_t *const c = expression->conditional.condition;
1680 expression_classification_t const cclass = is_constant_expression(c);
1681 if (cclass != EXPR_CLASS_CONSTANT)
1684 if (fold_constant_to_bool(c)) {
1685 expression_t const *const t = expression->conditional.true_expression;
1686 return is_linker_constant(t != NULL ? t : c);
1688 return is_linker_constant(expression->conditional.false_expression);
1693 entity_t *entity = expression->select.compound_entry;
1694 if (!is_declaration(entity))
1695 return EXPR_CLASS_VARIABLE;
1696 type_t *type = skip_typeref(entity->declaration.type);
1697 if (is_type_array(type)) {
1698 /* arrays automatically convert to their address */
1699 expression_t *compound = expression->select.compound;
1700 type_t *base_type = skip_typeref(compound->base.type);
1701 if (is_type_pointer(base_type)) {
1703 return is_linker_constant(compound);
1705 return is_object_with_linker_constant_address(compound);
1708 return EXPR_CLASS_VARIABLE;
1712 return is_constant_expression(expression);
1717 * Check if the given expression is a call to a builtin function
1718 * returning a constant result.
1720 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1722 expression_t *function = expression->call.function;
1723 if (function->kind != EXPR_REFERENCE)
1724 return EXPR_CLASS_VARIABLE;
1725 reference_expression_t *ref = &function->reference;
1726 if (ref->entity->kind != ENTITY_FUNCTION)
1727 return EXPR_CLASS_VARIABLE;
1729 switch (ref->entity->function.btk) {
1732 return EXPR_CLASS_CONSTANT;
1734 return EXPR_CLASS_VARIABLE;
1739 static expression_classification_t is_constant_pointer(const expression_t *expression)
1741 expression_classification_t const expr_class = is_constant_expression(expression);
1742 if (expr_class != EXPR_CLASS_VARIABLE)
1745 switch (expression->kind) {
1746 case EXPR_UNARY_CAST:
1747 return is_constant_pointer(expression->unary.value);
1749 return EXPR_CLASS_VARIABLE;
1753 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1755 switch (expression->kind) {
1757 expression_t *compound = expression->select.compound;
1758 type_t *compound_type = compound->base.type;
1759 compound_type = skip_typeref(compound_type);
1760 if (is_type_pointer(compound_type)) {
1761 return is_constant_pointer(compound);
1763 return is_object_with_constant_address(compound);
1767 case EXPR_ARRAY_ACCESS: {
1768 array_access_expression_t const* const array_access =
1769 &expression->array_access;
1770 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1771 if (idx_class != EXPR_CLASS_CONSTANT)
1773 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1774 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1775 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1778 case EXPR_UNARY_DEREFERENCE:
1779 return is_constant_pointer(expression->unary.value);
1782 return EXPR_CLASS_ERROR;
1785 return EXPR_CLASS_VARIABLE;
1789 expression_classification_t is_constant_expression(const expression_t *expression)
1791 switch (expression->kind) {
1792 case EXPR_LITERAL_CASES:
1793 case EXPR_CLASSIFY_TYPE:
1796 case EXPR_BUILTIN_CONSTANT_P:
1797 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1798 case EXPR_ENUM_CONSTANT:
1799 return EXPR_CLASS_CONSTANT;
1802 type_t *const type = skip_typeref(expression->typeprop.type);
1804 !is_type_array(type) || !type->array.is_vla ? EXPR_CLASS_CONSTANT :
1805 EXPR_CLASS_VARIABLE;
1808 case EXPR_STRING_LITERAL:
1809 case EXPR_WIDE_STRING_LITERAL:
1811 case EXPR_LABEL_ADDRESS:
1816 case EXPR_STATEMENT:
1817 case EXPR_UNARY_POSTFIX_INCREMENT:
1818 case EXPR_UNARY_POSTFIX_DECREMENT:
1819 case EXPR_UNARY_PREFIX_INCREMENT:
1820 case EXPR_UNARY_PREFIX_DECREMENT:
1821 case EXPR_UNARY_ASSUME: /* has VOID type */
1822 case EXPR_UNARY_DEREFERENCE:
1823 case EXPR_UNARY_DELETE:
1824 case EXPR_UNARY_DELETE_ARRAY:
1825 case EXPR_UNARY_THROW:
1826 case EXPR_BINARY_ASSIGN:
1827 case EXPR_BINARY_MUL_ASSIGN:
1828 case EXPR_BINARY_DIV_ASSIGN:
1829 case EXPR_BINARY_MOD_ASSIGN:
1830 case EXPR_BINARY_ADD_ASSIGN:
1831 case EXPR_BINARY_SUB_ASSIGN:
1832 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1833 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1834 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1835 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1836 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1837 case EXPR_BINARY_COMMA:
1838 case EXPR_ARRAY_ACCESS:
1839 return EXPR_CLASS_VARIABLE;
1841 case EXPR_REFERENCE: {
1842 type_t *const type = skip_typeref(expression->base.type);
1843 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1846 case EXPR_UNARY_TAKE_ADDRESS:
1847 return is_object_with_constant_address(expression->unary.value);
1850 return is_builtin_const_call(expression);
1852 case EXPR_UNARY_NEGATE:
1853 case EXPR_UNARY_PLUS:
1854 case EXPR_UNARY_BITWISE_NEGATE:
1855 case EXPR_UNARY_NOT:
1856 return is_constant_expression(expression->unary.value);
1858 case EXPR_UNARY_CAST: {
1859 type_t *const type = skip_typeref(expression->base.type);
1860 if (is_type_scalar(type))
1861 return is_constant_expression(expression->unary.value);
1862 if (!is_type_valid(type))
1863 return EXPR_CLASS_ERROR;
1864 return EXPR_CLASS_VARIABLE;
1867 case EXPR_BINARY_ADD:
1868 case EXPR_BINARY_SUB:
1869 case EXPR_BINARY_MUL:
1870 case EXPR_BINARY_DIV:
1871 case EXPR_BINARY_MOD:
1872 case EXPR_BINARY_EQUAL:
1873 case EXPR_BINARY_NOTEQUAL:
1874 case EXPR_BINARY_LESS:
1875 case EXPR_BINARY_LESSEQUAL:
1876 case EXPR_BINARY_GREATER:
1877 case EXPR_BINARY_GREATEREQUAL:
1878 case EXPR_BINARY_BITWISE_AND:
1879 case EXPR_BINARY_BITWISE_OR:
1880 case EXPR_BINARY_BITWISE_XOR:
1881 case EXPR_BINARY_SHIFTLEFT:
1882 case EXPR_BINARY_SHIFTRIGHT:
1883 case EXPR_BINARY_ISGREATER:
1884 case EXPR_BINARY_ISGREATEREQUAL:
1885 case EXPR_BINARY_ISLESS:
1886 case EXPR_BINARY_ISLESSEQUAL:
1887 case EXPR_BINARY_ISLESSGREATER:
1888 case EXPR_BINARY_ISUNORDERED: {
1889 expression_classification_t const l = is_constant_expression(expression->binary.left);
1890 expression_classification_t const r = is_constant_expression(expression->binary.right);
1891 return l < r ? l : r;
1894 case EXPR_BINARY_LOGICAL_AND: {
1895 expression_t const *const left = expression->binary.left;
1896 expression_classification_t const lclass = is_constant_expression(left);
1897 if (lclass != EXPR_CLASS_CONSTANT)
1899 if (!fold_constant_to_bool(left))
1900 return EXPR_CLASS_CONSTANT;
1901 return is_constant_expression(expression->binary.right);
1904 case EXPR_BINARY_LOGICAL_OR: {
1905 expression_t const *const left = expression->binary.left;
1906 expression_classification_t const lclass = is_constant_expression(left);
1907 if (lclass != EXPR_CLASS_CONSTANT)
1909 if (fold_constant_to_bool(left))
1910 return EXPR_CLASS_CONSTANT;
1911 return is_constant_expression(expression->binary.right);
1914 case EXPR_COMPOUND_LITERAL:
1915 return is_constant_initializer(expression->compound_literal.initializer);
1917 case EXPR_CONDITIONAL: {
1918 expression_t *const condition = expression->conditional.condition;
1919 expression_classification_t const cclass = is_constant_expression(condition);
1920 if (cclass != EXPR_CLASS_CONSTANT)
1923 if (fold_constant_to_bool(condition)) {
1924 expression_t const *const t = expression->conditional.true_expression;
1925 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1927 return is_constant_expression(expression->conditional.false_expression);
1932 return EXPR_CLASS_ERROR;
1934 panic("invalid expression found (is constant expression)");
1939 obstack_init(&ast_obstack);
1944 obstack_free(&ast_obstack, NULL);