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"
29 #include "separator_t.h"
37 #if defined(__INTEL_COMPILER)
39 #elif defined(__CYGWIN__)
40 #include "win32/cygwin_math_ext.h"
45 #include "adt/error.h"
48 struct obstack ast_obstack;
51 static int case_indent;
53 bool print_implicit_casts = false;
54 bool print_parenthesis = false;
56 static void print_statement(const statement_t *statement);
57 static void print_expression_prec(const expression_t *expression, unsigned prec);
59 void change_indent(int delta)
65 void print_indent(void)
67 for (int i = 0; i < indent; ++i)
72 * Returns 1 if a given precedence level has right-to-left
73 * associativity, else 0.
75 * @param precedence the operator precedence
77 static int right_to_left(unsigned precedence)
81 case PREC_CONDITIONAL:
91 * Return the precedence of an expression given by its kind.
93 * @param kind the expression kind
95 static unsigned get_expression_precedence(expression_kind_t kind)
97 static const unsigned prec[] = {
98 [EXPR_ERROR] = PREC_PRIMARY,
99 [EXPR_REFERENCE] = PREC_PRIMARY,
100 [EXPR_ENUM_CONSTANT] = PREC_PRIMARY,
101 [EXPR_LITERAL_INTEGER] = PREC_PRIMARY,
102 [EXPR_LITERAL_FLOATINGPOINT] = PREC_PRIMARY,
103 [EXPR_LITERAL_CHARACTER] = PREC_PRIMARY,
104 [EXPR_LITERAL_MS_NOOP] = PREC_PRIMARY,
105 [EXPR_STRING_LITERAL] = PREC_PRIMARY,
106 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
107 [EXPR_CALL] = PREC_POSTFIX,
108 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
109 [EXPR_SELECT] = PREC_POSTFIX,
110 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
111 [EXPR_SIZEOF] = PREC_UNARY,
112 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
113 [EXPR_ALIGNOF] = PREC_UNARY,
115 [EXPR_FUNCNAME] = PREC_PRIMARY,
116 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
117 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
118 [EXPR_OFFSETOF] = PREC_PRIMARY,
119 [EXPR_VA_START] = PREC_PRIMARY,
120 [EXPR_VA_ARG] = PREC_PRIMARY,
121 [EXPR_VA_COPY] = PREC_PRIMARY,
122 [EXPR_STATEMENT] = PREC_PRIMARY,
123 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
125 [EXPR_UNARY_NEGATE] = PREC_UNARY,
126 [EXPR_UNARY_PLUS] = PREC_UNARY,
127 [EXPR_UNARY_BITWISE_NEGATE] = PREC_UNARY,
128 [EXPR_UNARY_NOT] = PREC_UNARY,
129 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
130 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
131 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
132 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
133 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
134 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
135 [EXPR_UNARY_CAST] = PREC_UNARY,
136 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
137 [EXPR_UNARY_DELETE] = PREC_UNARY,
138 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
139 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
141 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
142 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
143 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
144 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
145 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
146 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
147 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
148 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
149 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
150 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
151 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
152 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
153 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
154 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
155 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
156 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
157 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
158 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
159 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
160 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
161 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
162 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
163 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
164 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
165 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
166 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
167 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
168 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
169 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
170 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
172 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
173 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
174 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
175 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
176 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
177 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
179 assert((size_t)kind < lengthof(prec));
180 unsigned res = prec[kind];
182 assert(res != PREC_BOTTOM);
187 * Print a quoted string constant.
189 * @param string the string constant
190 * @param border the border char
192 static void print_quoted_string(const string_t *const string, char border)
194 print_string(get_string_encoding_prefix(string->encoding));
197 const char *end = string->begin + string->size;
198 for (const char *c = string->begin; c != end; ++c) {
204 case '\\': print_string("\\\\"); break;
205 case '\a': print_string("\\a"); break;
206 case '\b': print_string("\\b"); break;
207 case '\f': print_string("\\f"); break;
208 case '\n': print_string("\\n"); break;
209 case '\r': print_string("\\r"); break;
210 case '\t': print_string("\\t"); break;
211 case '\v': print_string("\\v"); break;
212 case '\?': print_string("\\?"); break;
214 if (c_mode & _GNUC) {
215 print_string("\\e"); break;
219 if ((unsigned)tc < 0x80 && !isprint(tc)) {
220 print_format("\\%03o", (unsigned)tc);
230 static void print_string_literal(string_literal_expression_t const *const literal, char const delimiter)
232 print_quoted_string(&literal->value, delimiter);
235 static void print_literal(const literal_expression_t *literal)
237 switch (literal->base.kind) {
238 case EXPR_LITERAL_MS_NOOP:
239 print_string("__noop");
242 case EXPR_LITERAL_BOOLEAN:
243 case EXPR_LITERAL_FLOATINGPOINT:
244 case EXPR_LITERAL_INTEGER:
245 print_string(literal->value.begin);
251 print_string("INVALID LITERAL KIND");
255 * Prints a predefined symbol.
257 static void print_funcname(const funcname_expression_t *funcname)
260 switch (funcname->kind) {
261 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
262 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
263 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
264 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
269 static void print_compound_literal(
270 const compound_literal_expression_t *expression)
273 print_type(expression->type);
275 print_initializer(expression->initializer);
278 static void print_assignment_expression(const expression_t *const expr)
280 print_expression_prec(expr, PREC_ASSIGNMENT);
284 * Prints a call expression.
286 * @param call the call expression
288 static void print_call_expression(const call_expression_t *call)
290 print_expression_prec(call->function, PREC_POSTFIX);
292 separator_t sep = { "", ", " };
293 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
294 print_string(sep_next(&sep));
295 print_assignment_expression(arg->expression);
301 * Prints a binary expression.
303 * @param binexpr the binary expression
305 static void print_binary_expression(const binary_expression_t *binexpr)
307 unsigned prec = get_expression_precedence(binexpr->base.kind);
308 int r2l = right_to_left(prec);
310 print_expression_prec(binexpr->left, prec + r2l);
312 switch (binexpr->base.kind) {
313 case EXPR_BINARY_COMMA: op = ", "; break;
314 case EXPR_BINARY_ASSIGN: op = " = "; break;
315 case EXPR_BINARY_ADD: op = " + "; break;
316 case EXPR_BINARY_SUB: op = " - "; break;
317 case EXPR_BINARY_MUL: op = " * "; break;
318 case EXPR_BINARY_MOD: op = " % "; break;
319 case EXPR_BINARY_DIV: op = " / "; break;
320 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
321 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
322 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
323 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
324 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
325 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
326 case EXPR_BINARY_EQUAL: op = " == "; break;
327 case EXPR_BINARY_LESS: op = " < "; break;
328 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
329 case EXPR_BINARY_GREATER: op = " > "; break;
330 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
331 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
332 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
334 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
335 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
336 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
337 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
338 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
339 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
340 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
341 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
342 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
343 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
344 default: panic("invalid binexpression found");
347 print_expression_prec(binexpr->right, prec + 1 - r2l);
351 * Prints an unary expression.
353 * @param unexpr the unary expression
355 static void print_unary_expression(const unary_expression_t *unexpr)
357 unsigned prec = get_expression_precedence(unexpr->base.kind);
358 switch (unexpr->base.kind) {
359 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
360 case EXPR_UNARY_PLUS: print_char ('+' ); break;
361 case EXPR_UNARY_NOT: print_char ('!' ); break;
362 case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;
363 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
364 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
365 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
366 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
367 case EXPR_UNARY_DELETE: print_string("delete "); break;
368 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
370 case EXPR_UNARY_POSTFIX_INCREMENT:
371 print_expression_prec(unexpr->value, prec);
374 case EXPR_UNARY_POSTFIX_DECREMENT:
375 print_expression_prec(unexpr->value, prec);
378 case EXPR_UNARY_CAST:
380 print_type(unexpr->base.type);
383 case EXPR_UNARY_ASSUME:
384 print_string("__assume(");
385 print_assignment_expression(unexpr->value);
389 case EXPR_UNARY_THROW:
390 if (unexpr->value == NULL) {
391 print_string("throw");
394 print_string("throw ");
398 panic("invalid unary expression found");
400 print_expression_prec(unexpr->value, prec);
404 * Prints a reference expression.
406 * @param ref the reference expression
408 static void print_reference_expression(const reference_expression_t *ref)
410 print_string(ref->entity->base.symbol->string);
414 * Prints a label address expression.
416 * @param ref the reference expression
418 static void print_label_address_expression(const label_address_expression_t *le)
420 print_format("&&%s", le->label->base.symbol->string);
424 * Prints an array expression.
426 * @param expression the array expression
428 static void print_array_expression(const array_access_expression_t *expression)
430 if (!expression->flipped) {
431 print_expression_prec(expression->array_ref, PREC_POSTFIX);
433 print_expression(expression->index);
436 print_expression_prec(expression->index, PREC_POSTFIX);
438 print_expression(expression->array_ref);
444 * Prints a typeproperty expression (sizeof or __alignof__).
446 * @param expression the type property expression
448 static void print_typeprop_expression(const typeprop_expression_t *expression)
450 switch (expression->base.kind) {
451 case EXPR_SIZEOF: print_string("sizeof"); break;
452 case EXPR_ALIGNOF: print_string(c_mode & _C11 ? "_Alignof" : "__alignof__"); break;
453 default: panic("invalid typeprop kind");
455 if (expression->tp_expression != NULL) {
456 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
457 print_expression_prec(expression->tp_expression, PREC_TOP);
460 print_type(expression->type);
466 * Prints a builtin constant expression.
468 * @param expression the builtin constant expression
470 static void print_builtin_constant(const builtin_constant_expression_t *expression)
472 print_string("__builtin_constant_p(");
473 print_assignment_expression(expression->value);
478 * Prints a builtin types compatible expression.
480 * @param expression the builtin types compatible expression
482 static void print_builtin_types_compatible(
483 const builtin_types_compatible_expression_t *expression)
485 print_string("__builtin_types_compatible_p(");
486 print_type(expression->left);
488 print_type(expression->right);
493 * Prints a conditional expression.
495 * @param expression the conditional expression
497 static void print_conditional(const conditional_expression_t *expression)
499 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
500 if (expression->true_expression != NULL) {
502 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
505 print_string(" ?: ");
507 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
508 print_expression_prec(expression->false_expression, prec);
512 * Prints a va_start expression.
514 * @param expression the va_start expression
516 static void print_va_start(const va_start_expression_t *const expression)
518 print_string("__builtin_va_start(");
519 print_assignment_expression(expression->ap);
521 print_assignment_expression(expression->parameter);
526 * Prints a va_arg expression.
528 * @param expression the va_arg expression
530 static void print_va_arg(const va_arg_expression_t *expression)
532 print_string("__builtin_va_arg(");
533 print_assignment_expression(expression->ap);
535 print_type(expression->base.type);
540 * Prints a va_copy expression.
542 * @param expression the va_copy expression
544 static void print_va_copy(const va_copy_expression_t *expression)
546 print_string("__builtin_va_copy(");
547 print_assignment_expression(expression->dst);
549 print_assignment_expression(expression->src);
554 * Prints a select expression (. or ->).
556 * @param expression the select expression
558 static void print_select(const select_expression_t *expression)
560 print_expression_prec(expression->compound, PREC_POSTFIX);
561 /* do not print anything for anonymous struct/union selects
562 * FIXME: if the anonymous select was a '->' this will print '.'
564 if (expression->compound_entry->base.symbol == NULL)
567 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
572 print_string(expression->compound_entry->base.symbol->string);
576 * Prints a type classify expression.
578 * @param expr the type classify expression
580 static void print_classify_type_expression(
581 const classify_type_expression_t *const expr)
583 print_string("__builtin_classify_type(");
584 print_assignment_expression(expr->type_expression);
589 * Prints a designator.
591 * @param designator the designator
593 static void print_designator(const designator_t *designator)
595 for ( ; designator != NULL; designator = designator->next) {
596 if (designator->symbol == NULL) {
598 print_expression(designator->array_index);
602 print_string(designator->symbol->string);
608 * Prints an offsetof expression.
610 * @param expression the offset expression
612 static void print_offsetof_expression(const offsetof_expression_t *expression)
614 print_string("__builtin_offsetof(");
615 print_type(expression->type);
617 print_designator(expression->designator);
622 * Prints a statement expression.
624 * @param expression the statement expression
626 static void print_statement_expression(const statement_expression_t *expression)
629 print_statement(expression->statement);
633 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
635 if (expr->base.parenthesized)
638 if (top_prec > get_expression_precedence(expr->base.kind))
641 if (print_parenthesis && top_prec != PREC_BOTTOM) {
642 switch (expr->kind) {
643 case EXPR_ENUM_CONSTANT:
645 case EXPR_LITERAL_CASES:
646 case EXPR_LITERAL_CHARACTER:
648 case EXPR_STRING_LITERAL:
649 /* Do not print () around subexpressions consisting of a single token. */
661 * Prints an expression with parenthesis if needed.
663 * @param expression the expression to print
664 * @param top_prec the precedence of the user of this expression.
666 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
668 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
669 expr = expr->unary.value;
672 bool const parenthesized = needs_parentheses(expr, top_prec);
676 switch (expr->kind) {
678 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
679 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
680 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
681 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
682 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
683 case EXPR_CALL: print_call_expression( &expr->call); break;
684 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
685 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
686 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
687 case EXPR_ERROR: print_string("$error$"); break;
688 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
689 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
690 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
691 case EXPR_LITERAL_CHARACTER: print_string_literal( &expr->string_literal, '\''); break;
692 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
694 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
695 case EXPR_SELECT: print_select( &expr->select); break;
696 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
697 case EXPR_STRING_LITERAL: print_string_literal( &expr->string_literal, '"'); break;
698 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
699 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
700 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
701 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
707 static void print_indented_statement(statement_t const *const stmt)
709 switch (stmt->kind) {
710 case STATEMENT_LABEL:
713 case STATEMENT_CASE_LABEL:
714 for (int i = 0; i != case_indent; ++i)
722 print_statement(stmt);
726 * Print an compound statement.
728 * @param block the compound statement
730 static void print_compound_statement(const compound_statement_t *block)
735 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
736 print_indented_statement(stmt);
746 * Print a return statement.
748 * @param statement the return statement
750 static void print_return_statement(const return_statement_t *statement)
752 expression_t const *const val = statement->value;
754 print_string("return ");
755 print_expression(val);
758 print_string("return;");
763 * Print an expression statement.
765 * @param statement the expression statement
767 static void print_expression_statement(const expression_statement_t *statement)
769 print_expression(statement->expression);
774 * Print a computed goto statement.
776 * @param statement the computed goto statement
778 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
780 print_string("goto *");
781 print_expression(stmt->expression);
786 * Print a goto statement.
788 * @param statement the goto statement
790 static void print_goto_statement(const goto_statement_t *statement)
792 print_string("goto ");
793 print_string(statement->label->base.symbol->string);
798 * Print a label statement.
800 * @param statement the label statement
802 static void print_label_statement(const label_statement_t *statement)
804 print_format("%s:\n", statement->label->base.symbol->string);
805 print_indented_statement(statement->statement);
808 static void print_inner_statement(statement_t const *const stmt)
810 if (stmt->kind == STATEMENT_COMPOUND) {
812 print_compound_statement(&stmt->compound);
816 print_indented_statement(stmt);
821 static void print_after_inner_statement(statement_t const *const stmt)
823 if (stmt->kind == STATEMENT_COMPOUND) {
832 * Print an if statement.
834 * @param statement the if statement
836 static void print_if_statement(const if_statement_t *statement)
838 print_string("if (");
839 print_expression(statement->condition);
841 print_inner_statement(statement->true_statement);
843 statement_t const *const f = statement->false_statement;
845 print_after_inner_statement(statement->true_statement);
846 print_string("else");
847 if (f->kind == STATEMENT_IF) {
849 print_if_statement(&f->ifs);
851 print_inner_statement(f);
857 * Print a switch statement.
859 * @param statement the switch statement
861 static void print_switch_statement(const switch_statement_t *statement)
863 int const old_case_indent = case_indent;
864 case_indent = indent;
866 print_string("switch (");
867 print_expression(statement->expression);
869 print_inner_statement(statement->body);
871 case_indent = old_case_indent;
875 * Print a case label (including the default label).
877 * @param statement the case label statement
879 static void print_case_label(const case_label_statement_t *statement)
881 if (statement->expression == NULL) {
882 print_string("default:\n");
884 print_string("case ");
885 print_expression(statement->expression);
886 if (statement->end_range != NULL) {
887 print_string(" ... ");
888 print_expression(statement->end_range);
892 print_indented_statement(statement->statement);
895 static void print_typedef(const entity_t *entity)
897 print_string("typedef ");
898 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
903 * returns true if the entity is a compiler generated one and has no real
904 * correspondenc in the source file
906 static bool is_generated_entity(const entity_t *entity)
908 if (entity->kind == ENTITY_TYPEDEF)
909 return entity->typedefe.builtin;
911 if (is_declaration(entity))
912 return entity->declaration.implicit;
918 * Print a declaration statement.
920 * @param statement the statement
922 static void print_declaration_statement(
923 const declaration_statement_t *statement)
926 entity_t *entity = statement->declarations_begin;
927 if (entity == NULL) {
928 print_string("/* empty declaration statement */");
932 entity_t *const end = statement->declarations_end->base.next;
933 for (; entity != end; entity = entity->base.next) {
934 if (entity->kind == ENTITY_ENUM_VALUE)
936 if (is_generated_entity(entity))
946 print_entity(entity);
951 * Print a do-while statement.
953 * @param statement the statement
955 static void print_do_while_statement(const do_while_statement_t *statement)
958 print_inner_statement(statement->body);
959 print_after_inner_statement(statement->body);
960 print_string("while (");
961 print_expression(statement->condition);
966 * Print a for statement.
968 * @param statement the statement
970 static void print_for_statement(const for_statement_t *statement)
972 if (statement->initialisation || statement->scope.entities || !statement->condition || statement->step) {
973 print_string("for (");
974 if (statement->initialisation != NULL) {
975 print_expression(statement->initialisation);
978 entity_t const *entity = statement->scope.entities;
979 for (; entity != NULL; entity = entity->base.next) {
980 if (is_generated_entity(entity))
982 /* FIXME display of multiple declarations is wrong */
983 print_declaration(entity);
986 if (statement->condition != NULL) {
988 print_expression(statement->condition);
991 if (statement->step != NULL) {
993 print_expression(statement->step);
996 print_string("while (");
997 print_expression(statement->condition);
1000 print_inner_statement(statement->body);
1004 * Print assembler arguments.
1006 * @param arguments the arguments
1008 static void print_asm_arguments(asm_argument_t const *const arguments)
1011 separator_t sep = { " ", ", " };
1012 for (asm_argument_t const *i = arguments; i; i = i->next) {
1013 print_string(sep_next(&sep));
1015 print_format("[%s] ", i->symbol->string);
1016 print_quoted_string(&i->constraints, '"');
1018 print_expression(i->expression);
1024 * Print assembler clobbers.
1026 * @param clobbers the clobbers
1028 static void print_asm_clobbers(asm_clobber_t const *const clobbers)
1031 separator_t sep = { " ", ", " };
1032 for (asm_clobber_t const *i = clobbers; i; i = i->next) {
1033 print_string(sep_next(&sep));
1034 print_quoted_string(&i->clobber, '"');
1038 static void print_asm_labels(asm_label_t const *const labels)
1041 separator_t sep = { " ", ", " };
1042 for (asm_label_t const *i = labels; i; i = i->next) {
1043 print_string(sep_next(&sep));
1044 print_string(i->label->base.symbol->string);
1049 * Print an assembler statement.
1051 * @param stmt the statement
1053 static void print_asm_statement(asm_statement_t const *const stmt)
1055 print_string("asm");
1056 if (stmt->is_volatile) print_string(" volatile");
1057 if (stmt->labels) print_string(" goto");
1059 print_quoted_string(&stmt->asm_text, '"');
1063 stmt->clobbers ? 3 :
1067 if (n >= 1) print_asm_arguments(stmt->outputs);
1068 if (n >= 2) print_asm_arguments(stmt->inputs);
1069 if (n >= 3) print_asm_clobbers( stmt->clobbers);
1070 if (n >= 4) print_asm_labels( stmt->labels);
1076 * Print a microsoft __try statement.
1078 * @param statement the statement
1080 static void print_ms_try_statement(const ms_try_statement_t *statement)
1082 print_string("__try");
1083 print_inner_statement(statement->try_statement);
1084 print_after_inner_statement(statement->try_statement);
1085 if (statement->except_expression != NULL) {
1086 print_string("__except(");
1087 print_expression(statement->except_expression);
1090 print_string("__finally");
1092 print_inner_statement(statement->final_statement);
1096 * Print a microsoft __leave statement.
1098 * @param statement the statement
1100 static void print_leave_statement(const leave_statement_t *statement)
1103 print_string("__leave;");
1107 * Print a statement.
1109 * @param statement the statement
1111 void print_statement(statement_t const *const stmt)
1113 switch (stmt->kind) {
1114 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1115 case STATEMENT_BREAK: print_string("break;"); break;
1116 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1117 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1118 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1119 case STATEMENT_CONTINUE: print_string("continue;"); break;
1120 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1121 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1122 case STATEMENT_EMPTY: print_char(';'); break;
1123 case STATEMENT_ERROR: print_string("$error statement$"); break;
1124 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1125 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1126 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1127 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1128 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1129 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1130 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1131 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1132 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1137 * Print a storage class.
1139 * @param storage_class the storage class
1141 static void print_storage_class(storage_class_tag_t storage_class)
1143 switch (storage_class) {
1144 case STORAGE_CLASS_NONE: return;
1145 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1146 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1147 case STORAGE_CLASS_STATIC: print_string("static "); return;
1148 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1149 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1151 panic("invalid storage class");
1155 * Print an initializer.
1157 * @param initializer the initializer
1159 void print_initializer(const initializer_t *initializer)
1161 if (initializer == NULL) {
1166 switch (initializer->kind) {
1167 case INITIALIZER_STRING:
1168 case INITIALIZER_VALUE:
1169 print_assignment_expression(initializer->value.value);
1172 case INITIALIZER_LIST: {
1174 const initializer_list_t *list = &initializer->list;
1176 for (size_t i = 0 ; i < list->len; ++i) {
1177 const initializer_t *sub_init = list->initializers[i];
1178 print_initializer(list->initializers[i]);
1179 if (i < list->len-1) {
1180 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1188 case INITIALIZER_DESIGNATOR:
1189 print_designator(initializer->designator.designator);
1190 print_string(" = ");
1194 panic("invalid initializer kind found");
1199 * Print microsoft extended declaration modifiers.
1201 static void print_ms_modifiers(const declaration_t *declaration)
1203 if ((c_mode & _MS) == 0)
1206 decl_modifiers_t modifiers = declaration->modifiers;
1208 separator_t sep = { "__declspec(", ", " };
1210 if (declaration->base.kind == ENTITY_VARIABLE) {
1211 variable_t *variable = (variable_t*)declaration;
1212 if (variable->alignment != 0
1213 || variable->get_property_sym != NULL
1214 || variable->put_property_sym != NULL) {
1215 if (variable->alignment != 0) {
1216 print_format("%salign(%u)", sep_next(&sep), variable->alignment);
1218 if (variable->get_property_sym != NULL
1219 || variable->put_property_sym != NULL) {
1221 print_format("%sproperty(", sep_next(&sep));
1222 if (variable->get_property_sym != NULL) {
1223 print_format("get=%s", variable->get_property_sym->string);
1226 if (variable->put_property_sym != NULL)
1227 print_format("%sput=%s", comma, variable->put_property_sym->string);
1233 /* DM_FORCEINLINE handled outside. */
1234 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1235 if (modifiers & DM_DLLIMPORT) {
1236 print_format("%sdllimport", sep_next(&sep));
1238 if (modifiers & DM_DLLEXPORT) {
1239 print_format("%sdllexport", sep_next(&sep));
1241 if (modifiers & DM_THREAD) {
1242 print_format("%sthread", sep_next(&sep));
1244 if (modifiers & DM_NAKED) {
1245 print_format("%snaked", sep_next(&sep));
1247 if (modifiers & DM_THREAD) {
1248 print_format("%sthread", sep_next(&sep));
1250 if (modifiers & DM_SELECTANY) {
1251 print_format("%sselectany", sep_next(&sep));
1253 if (modifiers & DM_NOTHROW) {
1254 print_format("%snothrow", sep_next(&sep));
1256 if (modifiers & DM_NORETURN) {
1257 print_format("%snoreturn", sep_next(&sep));
1259 if (modifiers & DM_NOINLINE) {
1260 print_format("%snoinline", sep_next(&sep));
1262 if (modifiers & DM_DEPRECATED) {
1263 print_format("%sdeprecated", sep_next(&sep));
1264 if (declaration->deprecated_string != NULL)
1265 print_format("(\"%s\")",
1266 declaration->deprecated_string);
1268 if (modifiers & DM_RESTRICT) {
1269 print_format("%srestrict", sep_next(&sep));
1271 if (modifiers & DM_NOALIAS) {
1272 print_format("%snoalias", sep_next(&sep));
1276 if (!sep_at_first(&sep))
1281 static void print_scope(const scope_t *scope)
1283 const entity_t *entity = scope->entities;
1284 for ( ; entity != NULL; entity = entity->base.next) {
1286 print_entity(entity);
1291 static void print_namespace(const namespace_t *namespace)
1293 print_string("namespace ");
1294 if (namespace->base.symbol != NULL) {
1295 print_string(namespace->base.symbol->string);
1299 print_string("{\n");
1302 print_scope(&namespace->members);
1306 print_string("}\n");
1310 * Print a variable or function declaration
1312 void print_declaration(const entity_t *entity)
1314 assert(is_declaration(entity));
1315 const declaration_t *declaration = &entity->declaration;
1317 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1318 if (entity->kind == ENTITY_FUNCTION) {
1319 function_t *function = (function_t*)declaration;
1320 if (function->is_inline) {
1321 if (declaration->modifiers & DM_FORCEINLINE) {
1322 print_string("__forceinline ");
1323 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1324 print_string("__inline ");
1326 print_string("inline ");
1330 //print_ms_modifiers(declaration);
1331 switch (entity->kind) {
1332 case ENTITY_FUNCTION:
1333 print_type_ext(entity->declaration.type, entity->base.symbol,
1334 &entity->function.parameters);
1336 if (entity->function.body != NULL) {
1338 print_indented_statement(entity->function.body);
1344 case ENTITY_VARIABLE:
1345 if (entity->variable.thread_local)
1346 print_string(c_mode & _C11 ? "_Thread_local " : "__thread ");
1347 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1348 if (entity->variable.initializer != NULL) {
1349 print_string(" = ");
1350 print_initializer(entity->variable.initializer);
1354 case ENTITY_COMPOUND_MEMBER:
1355 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1356 if (entity->compound_member.bitfield) {
1357 print_format(" : %u", entity->compound_member.bit_size);
1362 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1369 * Prints an expression.
1371 * @param expression the expression
1373 void print_expression(const expression_t *expression)
1375 print_expression_prec(expression, PREC_BOTTOM);
1379 * Print a declaration.
1381 * @param declaration the declaration
1383 void print_entity(const entity_t *entity)
1385 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1388 switch ((entity_kind_tag_t)entity->kind) {
1389 case ENTITY_VARIABLE:
1390 case ENTITY_PARAMETER:
1391 case ENTITY_COMPOUND_MEMBER:
1392 case ENTITY_FUNCTION:
1393 print_declaration(entity);
1395 case ENTITY_TYPEDEF:
1396 print_typedef(entity);
1400 print_string("class ");
1401 print_string(entity->base.symbol->string);
1402 print_string("; /* TODO */\n");
1405 print_string("struct ");
1406 goto print_compound;
1408 print_string("union ");
1410 print_string(entity->base.symbol->string);
1411 if (entity->compound.complete) {
1413 print_compound_definition(&entity->compound);
1418 print_string("enum ");
1419 print_string(entity->base.symbol->string);
1421 print_enum_definition(&entity->enume);
1424 case ENTITY_NAMESPACE:
1425 print_namespace(&entity->namespacee);
1427 case ENTITY_LOCAL_LABEL:
1428 print_string("__label__ ");
1429 print_string(entity->base.symbol->string);
1433 case ENTITY_ENUM_VALUE:
1434 panic("print_entity used on unexpected entity type");
1436 panic("Invalid entity type encountered");
1440 * Print the AST of a translation unit.
1442 * @param unit the translation unit
1444 void print_ast(const translation_unit_t *unit)
1446 entity_t *entity = unit->scope.entities;
1447 for ( ; entity != NULL; entity = entity->base.next) {
1448 if (entity->kind == ENTITY_ENUM_VALUE)
1450 if (entity->base.namespc != NAMESPACE_NORMAL
1451 && entity->base.symbol == NULL)
1453 if (is_generated_entity(entity))
1457 print_entity(entity);
1462 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1464 switch (initializer->kind) {
1465 case INITIALIZER_STRING:
1466 case INITIALIZER_DESIGNATOR:
1467 return EXPR_CLASS_CONSTANT;
1469 case INITIALIZER_VALUE:
1470 return is_linker_constant(initializer->value.value);
1472 case INITIALIZER_LIST: {
1473 expression_classification_t all = EXPR_CLASS_CONSTANT;
1474 for (size_t i = 0; i < initializer->list.len; ++i) {
1475 initializer_t *sub_initializer = initializer->list.initializers[i];
1476 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1484 panic("invalid initializer kind found");
1488 * Checks if an expression references an object with a constant/known location
1489 * to the linker. Example:
1490 * - "x", "*&x" with x being a global variable. The value of x need not be
1491 * constant but the address of x is.
1492 * - "a.b.c" when a has a constant/known location to the linker
1494 static expression_classification_t is_object_with_linker_constant_address(
1495 const expression_t *expression)
1497 switch (expression->kind) {
1498 case EXPR_UNARY_DEREFERENCE:
1499 return is_linker_constant(expression->unary.value);
1502 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1503 if (is_type_pointer(base_type)) {
1505 return is_linker_constant(expression->select.compound);
1507 return is_object_with_linker_constant_address(expression->select.compound);
1511 case EXPR_ARRAY_ACCESS: {
1512 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1513 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1514 return ref < idx ? ref : idx;
1517 case EXPR_REFERENCE: {
1518 entity_t *entity = expression->reference.entity;
1519 if (!is_declaration(entity))
1520 return EXPR_CLASS_VARIABLE;
1522 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1523 case STORAGE_CLASS_NONE:
1524 case STORAGE_CLASS_EXTERN:
1525 case STORAGE_CLASS_STATIC:
1527 entity->kind != ENTITY_VARIABLE ||
1528 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1529 EXPR_CLASS_VARIABLE;
1531 case STORAGE_CLASS_REGISTER:
1532 case STORAGE_CLASS_TYPEDEF:
1533 case STORAGE_CLASS_AUTO:
1536 return EXPR_CLASS_VARIABLE;
1540 return EXPR_CLASS_ERROR;
1543 return EXPR_CLASS_VARIABLE;
1547 expression_classification_t is_linker_constant(const expression_t *expression)
1549 switch (expression->kind) {
1550 case EXPR_STRING_LITERAL:
1552 case EXPR_LABEL_ADDRESS:
1553 return EXPR_CLASS_CONSTANT;
1555 case EXPR_COMPOUND_LITERAL:
1556 return is_constant_initializer(expression->compound_literal.initializer);
1558 case EXPR_UNARY_TAKE_ADDRESS:
1559 return is_object_with_linker_constant_address(expression->unary.value);
1561 case EXPR_UNARY_DEREFERENCE: {
1563 = revert_automatic_type_conversion(expression->unary.value);
1564 /* dereferencing a function is a NOP */
1565 if (is_type_function(real_type)) {
1566 return is_linker_constant(expression->unary.value);
1571 case EXPR_UNARY_CAST: {
1572 type_t *dest = skip_typeref(expression->base.type);
1573 if (!is_type_pointer(dest) && (
1574 dest->kind != TYPE_ATOMIC ||
1575 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1576 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1578 return is_constant_expression(expression);
1580 return is_linker_constant(expression->unary.value);
1583 case EXPR_BINARY_ADD:
1584 case EXPR_BINARY_SUB: {
1585 expression_t *const left = expression->binary.left;
1586 expression_t *const right = expression->binary.right;
1587 type_t *const ltype = skip_typeref(left->base.type);
1588 type_t *const rtype = skip_typeref(right->base.type);
1590 if (is_type_pointer(ltype)) {
1591 expression_classification_t const l = is_linker_constant(left);
1592 expression_classification_t const r = is_constant_expression(right);
1593 return l < r ? l : r;
1594 } else if (is_type_pointer(rtype)) {
1595 expression_classification_t const l = is_constant_expression(left);
1596 expression_classification_t const r = is_linker_constant(right);
1597 return l < r ? l : r;
1598 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1599 return EXPR_CLASS_ERROR;
1601 return is_constant_expression(expression);
1605 case EXPR_REFERENCE: {
1606 entity_t *entity = expression->reference.entity;
1607 if (!is_declaration(entity))
1608 return EXPR_CLASS_VARIABLE;
1610 type_t *type = skip_typeref(entity->declaration.type);
1611 if (is_type_function(type))
1612 return EXPR_CLASS_CONSTANT;
1613 if (is_type_array(type)) {
1614 return is_object_with_linker_constant_address(expression);
1616 /* Prevent stray errors */
1617 if (!is_type_valid(type))
1618 return EXPR_CLASS_ERROR;
1619 return EXPR_CLASS_VARIABLE;
1622 case EXPR_ARRAY_ACCESS: {
1623 type_t *const type =
1624 skip_typeref(revert_automatic_type_conversion(expression));
1625 if (!is_type_array(type))
1626 return EXPR_CLASS_VARIABLE;
1627 return is_linker_constant(expression->array_access.array_ref);
1630 case EXPR_CONDITIONAL: {
1631 expression_t *const c = expression->conditional.condition;
1632 expression_classification_t const cclass = is_constant_expression(c);
1633 if (cclass != EXPR_CLASS_CONSTANT)
1636 if (fold_constant_to_bool(c)) {
1637 expression_t const *const t = expression->conditional.true_expression;
1638 return is_linker_constant(t != NULL ? t : c);
1640 return is_linker_constant(expression->conditional.false_expression);
1645 entity_t *entity = expression->select.compound_entry;
1646 if (!is_declaration(entity))
1647 return EXPR_CLASS_VARIABLE;
1648 type_t *type = skip_typeref(entity->declaration.type);
1649 if (is_type_array(type)) {
1650 /* arrays automatically convert to their address */
1651 expression_t *compound = expression->select.compound;
1652 type_t *base_type = skip_typeref(compound->base.type);
1653 if (is_type_pointer(base_type)) {
1655 return is_linker_constant(compound);
1657 return is_object_with_linker_constant_address(compound);
1660 return EXPR_CLASS_VARIABLE;
1664 return is_constant_expression(expression);
1669 * Check if the given expression is a call to a builtin function
1670 * returning a constant result.
1672 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1674 expression_t *function = expression->call.function;
1675 if (function->kind != EXPR_REFERENCE)
1676 return EXPR_CLASS_VARIABLE;
1677 reference_expression_t *ref = &function->reference;
1678 if (ref->entity->kind != ENTITY_FUNCTION)
1679 return EXPR_CLASS_VARIABLE;
1681 switch (ref->entity->function.btk) {
1684 return EXPR_CLASS_CONSTANT;
1686 return EXPR_CLASS_VARIABLE;
1691 static expression_classification_t is_constant_pointer(const expression_t *expression)
1693 expression_classification_t const expr_class = is_constant_expression(expression);
1694 if (expr_class != EXPR_CLASS_VARIABLE)
1697 switch (expression->kind) {
1698 case EXPR_UNARY_CAST:
1699 return is_constant_pointer(expression->unary.value);
1701 return EXPR_CLASS_VARIABLE;
1705 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1707 switch (expression->kind) {
1709 expression_t *compound = expression->select.compound;
1710 type_t *compound_type = compound->base.type;
1711 compound_type = skip_typeref(compound_type);
1712 if (is_type_pointer(compound_type)) {
1713 return is_constant_pointer(compound);
1715 return is_object_with_constant_address(compound);
1719 case EXPR_ARRAY_ACCESS: {
1720 array_access_expression_t const* const array_access =
1721 &expression->array_access;
1722 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1723 if (idx_class != EXPR_CLASS_CONSTANT)
1725 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1726 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1727 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1730 case EXPR_UNARY_DEREFERENCE:
1731 return is_constant_pointer(expression->unary.value);
1734 return EXPR_CLASS_ERROR;
1737 return EXPR_CLASS_VARIABLE;
1741 expression_classification_t is_constant_expression(const expression_t *expression)
1743 switch (expression->kind) {
1744 case EXPR_LITERAL_CHARACTER:
1745 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1746 case EXPR_ENUM_CONSTANT:
1747 case EXPR_LITERAL_BOOLEAN:
1748 case EXPR_LITERAL_MS_NOOP:
1749 return EXPR_CLASS_CONSTANT;
1754 type = skip_typeref(expression->typeprop.type);
1757 case EXPR_CLASSIFY_TYPE:
1758 type = skip_typeref(expression->classify_type.type_expression->base.type);
1761 case EXPR_LITERAL_INTEGER:
1762 case EXPR_LITERAL_FLOATINGPOINT:
1763 type = skip_typeref(expression->base.type);
1767 type = skip_typeref(expression->offsetofe.type);
1771 type = skip_typeref(expression->typeprop.type);
1772 if (is_type_array(type) && type->array.is_vla)
1773 return EXPR_CLASS_VARIABLE;
1777 return is_type_valid(type) ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1780 case EXPR_BUILTIN_CONSTANT_P: {
1781 expression_classification_t const c = is_constant_expression(expression->builtin_constant.value);
1782 return c != EXPR_CLASS_ERROR ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1785 case EXPR_STRING_LITERAL:
1787 case EXPR_LABEL_ADDRESS:
1792 case EXPR_STATEMENT:
1793 case EXPR_UNARY_POSTFIX_INCREMENT:
1794 case EXPR_UNARY_POSTFIX_DECREMENT:
1795 case EXPR_UNARY_PREFIX_INCREMENT:
1796 case EXPR_UNARY_PREFIX_DECREMENT:
1797 case EXPR_UNARY_ASSUME: /* has VOID type */
1798 case EXPR_UNARY_DEREFERENCE:
1799 case EXPR_UNARY_DELETE:
1800 case EXPR_UNARY_DELETE_ARRAY:
1801 case EXPR_UNARY_THROW:
1802 case EXPR_BINARY_ASSIGN:
1803 case EXPR_BINARY_MUL_ASSIGN:
1804 case EXPR_BINARY_DIV_ASSIGN:
1805 case EXPR_BINARY_MOD_ASSIGN:
1806 case EXPR_BINARY_ADD_ASSIGN:
1807 case EXPR_BINARY_SUB_ASSIGN:
1808 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1809 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1810 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1811 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1812 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1813 case EXPR_BINARY_COMMA:
1814 case EXPR_ARRAY_ACCESS:
1815 return EXPR_CLASS_VARIABLE;
1817 case EXPR_REFERENCE: {
1818 type_t *const type = skip_typeref(expression->base.type);
1819 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1822 case EXPR_UNARY_TAKE_ADDRESS:
1823 return is_object_with_constant_address(expression->unary.value);
1826 return is_builtin_const_call(expression);
1828 case EXPR_UNARY_NEGATE:
1829 case EXPR_UNARY_PLUS:
1830 case EXPR_UNARY_BITWISE_NEGATE:
1831 case EXPR_UNARY_NOT:
1832 return is_constant_expression(expression->unary.value);
1834 case EXPR_UNARY_CAST: {
1835 type_t *const type = skip_typeref(expression->base.type);
1836 if (is_type_scalar(type))
1837 return is_constant_expression(expression->unary.value);
1838 if (!is_type_valid(type))
1839 return EXPR_CLASS_ERROR;
1840 return EXPR_CLASS_VARIABLE;
1843 case EXPR_BINARY_ADD:
1844 case EXPR_BINARY_SUB:
1845 case EXPR_BINARY_MUL:
1846 case EXPR_BINARY_DIV:
1847 case EXPR_BINARY_MOD:
1848 case EXPR_BINARY_EQUAL:
1849 case EXPR_BINARY_NOTEQUAL:
1850 case EXPR_BINARY_LESS:
1851 case EXPR_BINARY_LESSEQUAL:
1852 case EXPR_BINARY_GREATER:
1853 case EXPR_BINARY_GREATEREQUAL:
1854 case EXPR_BINARY_BITWISE_AND:
1855 case EXPR_BINARY_BITWISE_OR:
1856 case EXPR_BINARY_BITWISE_XOR:
1857 case EXPR_BINARY_SHIFTLEFT:
1858 case EXPR_BINARY_SHIFTRIGHT:
1859 case EXPR_BINARY_ISGREATER:
1860 case EXPR_BINARY_ISGREATEREQUAL:
1861 case EXPR_BINARY_ISLESS:
1862 case EXPR_BINARY_ISLESSEQUAL:
1863 case EXPR_BINARY_ISLESSGREATER:
1864 case EXPR_BINARY_ISUNORDERED: {
1865 expression_classification_t const l = is_constant_expression(expression->binary.left);
1866 expression_classification_t const r = is_constant_expression(expression->binary.right);
1867 return l < r ? l : r;
1870 case EXPR_BINARY_LOGICAL_AND: {
1871 expression_t const *const left = expression->binary.left;
1872 expression_classification_t const lclass = is_constant_expression(left);
1873 if (lclass != EXPR_CLASS_CONSTANT)
1875 if (!fold_constant_to_bool(left))
1876 return EXPR_CLASS_CONSTANT;
1877 return is_constant_expression(expression->binary.right);
1880 case EXPR_BINARY_LOGICAL_OR: {
1881 expression_t const *const left = expression->binary.left;
1882 expression_classification_t const lclass = is_constant_expression(left);
1883 if (lclass != EXPR_CLASS_CONSTANT)
1885 if (fold_constant_to_bool(left))
1886 return EXPR_CLASS_CONSTANT;
1887 return is_constant_expression(expression->binary.right);
1890 case EXPR_COMPOUND_LITERAL:
1891 return is_constant_initializer(expression->compound_literal.initializer);
1893 case EXPR_CONDITIONAL: {
1894 expression_t *const condition = expression->conditional.condition;
1895 expression_classification_t const cclass = is_constant_expression(condition);
1896 if (cclass != EXPR_CLASS_CONSTANT)
1899 if (fold_constant_to_bool(condition)) {
1900 expression_t const *const t = expression->conditional.true_expression;
1901 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1903 return is_constant_expression(expression->conditional.false_expression);
1908 return EXPR_CLASS_ERROR;
1910 panic("invalid expression");
1915 obstack_init(&ast_obstack);
1920 obstack_free(&ast_obstack, NULL);