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_MS_NOOP] = PREC_PRIMARY,
111 [EXPR_STRING_LITERAL] = PREC_PRIMARY,
112 [EXPR_COMPOUND_LITERAL] = PREC_UNARY,
113 [EXPR_CALL] = PREC_POSTFIX,
114 [EXPR_CONDITIONAL] = PREC_CONDITIONAL,
115 [EXPR_SELECT] = PREC_POSTFIX,
116 [EXPR_ARRAY_ACCESS] = PREC_POSTFIX,
117 [EXPR_SIZEOF] = PREC_UNARY,
118 [EXPR_CLASSIFY_TYPE] = PREC_UNARY,
119 [EXPR_ALIGNOF] = PREC_UNARY,
121 [EXPR_FUNCNAME] = PREC_PRIMARY,
122 [EXPR_BUILTIN_CONSTANT_P] = PREC_PRIMARY,
123 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
124 [EXPR_OFFSETOF] = PREC_PRIMARY,
125 [EXPR_VA_START] = PREC_PRIMARY,
126 [EXPR_VA_ARG] = PREC_PRIMARY,
127 [EXPR_VA_COPY] = PREC_PRIMARY,
128 [EXPR_STATEMENT] = PREC_PRIMARY,
129 [EXPR_LABEL_ADDRESS] = PREC_PRIMARY,
131 [EXPR_UNARY_NEGATE] = PREC_UNARY,
132 [EXPR_UNARY_PLUS] = PREC_UNARY,
133 [EXPR_UNARY_BITWISE_NEGATE] = PREC_UNARY,
134 [EXPR_UNARY_NOT] = PREC_UNARY,
135 [EXPR_UNARY_DEREFERENCE] = PREC_UNARY,
136 [EXPR_UNARY_TAKE_ADDRESS] = PREC_UNARY,
137 [EXPR_UNARY_POSTFIX_INCREMENT] = PREC_POSTFIX,
138 [EXPR_UNARY_POSTFIX_DECREMENT] = PREC_POSTFIX,
139 [EXPR_UNARY_PREFIX_INCREMENT] = PREC_UNARY,
140 [EXPR_UNARY_PREFIX_DECREMENT] = PREC_UNARY,
141 [EXPR_UNARY_CAST] = PREC_UNARY,
142 [EXPR_UNARY_ASSUME] = PREC_PRIMARY,
143 [EXPR_UNARY_DELETE] = PREC_UNARY,
144 [EXPR_UNARY_DELETE_ARRAY] = PREC_UNARY,
145 [EXPR_UNARY_THROW] = PREC_ASSIGNMENT,
147 [EXPR_BINARY_ADD] = PREC_ADDITIVE,
148 [EXPR_BINARY_SUB] = PREC_ADDITIVE,
149 [EXPR_BINARY_MUL] = PREC_MULTIPLICATIVE,
150 [EXPR_BINARY_DIV] = PREC_MULTIPLICATIVE,
151 [EXPR_BINARY_MOD] = PREC_MULTIPLICATIVE,
152 [EXPR_BINARY_EQUAL] = PREC_EQUALITY,
153 [EXPR_BINARY_NOTEQUAL] = PREC_EQUALITY,
154 [EXPR_BINARY_LESS] = PREC_RELATIONAL,
155 [EXPR_BINARY_LESSEQUAL] = PREC_RELATIONAL,
156 [EXPR_BINARY_GREATER] = PREC_RELATIONAL,
157 [EXPR_BINARY_GREATEREQUAL] = PREC_RELATIONAL,
158 [EXPR_BINARY_BITWISE_AND] = PREC_AND,
159 [EXPR_BINARY_BITWISE_OR] = PREC_OR,
160 [EXPR_BINARY_BITWISE_XOR] = PREC_XOR,
161 [EXPR_BINARY_LOGICAL_AND] = PREC_LOGICAL_AND,
162 [EXPR_BINARY_LOGICAL_OR] = PREC_LOGICAL_OR,
163 [EXPR_BINARY_SHIFTLEFT] = PREC_SHIFT,
164 [EXPR_BINARY_SHIFTRIGHT] = PREC_SHIFT,
165 [EXPR_BINARY_ASSIGN] = PREC_ASSIGNMENT,
166 [EXPR_BINARY_MUL_ASSIGN] = PREC_ASSIGNMENT,
167 [EXPR_BINARY_DIV_ASSIGN] = PREC_ASSIGNMENT,
168 [EXPR_BINARY_MOD_ASSIGN] = PREC_ASSIGNMENT,
169 [EXPR_BINARY_ADD_ASSIGN] = PREC_ASSIGNMENT,
170 [EXPR_BINARY_SUB_ASSIGN] = PREC_ASSIGNMENT,
171 [EXPR_BINARY_SHIFTLEFT_ASSIGN] = PREC_ASSIGNMENT,
172 [EXPR_BINARY_SHIFTRIGHT_ASSIGN] = PREC_ASSIGNMENT,
173 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGNMENT,
174 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGNMENT,
175 [EXPR_BINARY_BITWISE_OR_ASSIGN] = PREC_ASSIGNMENT,
176 [EXPR_BINARY_COMMA] = PREC_EXPRESSION,
178 [EXPR_BINARY_ISGREATER] = PREC_PRIMARY,
179 [EXPR_BINARY_ISGREATEREQUAL] = PREC_PRIMARY,
180 [EXPR_BINARY_ISLESS] = PREC_PRIMARY,
181 [EXPR_BINARY_ISLESSEQUAL] = PREC_PRIMARY,
182 [EXPR_BINARY_ISLESSGREATER] = PREC_PRIMARY,
183 [EXPR_BINARY_ISUNORDERED] = PREC_PRIMARY
185 assert((size_t)kind < lengthof(prec));
186 unsigned res = prec[kind];
188 assert(res != PREC_BOTTOM);
193 * Print a quoted string constant.
195 * @param string the string constant
196 * @param border the border char
198 static void print_quoted_string(const string_t *const string, char border)
200 print_string(get_string_encoding_prefix(string->encoding));
203 const char *end = string->begin + string->size;
204 for (const char *c = string->begin; c != end; ++c) {
210 case '\\': print_string("\\\\"); break;
211 case '\a': print_string("\\a"); break;
212 case '\b': print_string("\\b"); break;
213 case '\f': print_string("\\f"); break;
214 case '\n': print_string("\\n"); break;
215 case '\r': print_string("\\r"); break;
216 case '\t': print_string("\\t"); break;
217 case '\v': print_string("\\v"); break;
218 case '\?': print_string("\\?"); break;
220 if (c_mode & _GNUC) {
221 print_string("\\e"); break;
225 if ((unsigned)tc < 0x80 && !isprint(tc)) {
226 print_format("\\%03o", (unsigned)tc);
236 static void print_string_literal(string_literal_expression_t const *const literal, char const delimiter)
238 print_quoted_string(&literal->value, delimiter);
241 static void print_literal(const literal_expression_t *literal)
243 switch (literal->base.kind) {
244 case EXPR_LITERAL_MS_NOOP:
245 print_string("__noop");
248 case EXPR_LITERAL_BOOLEAN:
249 case EXPR_LITERAL_FLOATINGPOINT:
250 case EXPR_LITERAL_INTEGER:
251 print_stringrep(&literal->value);
252 print_stringrep(&literal->suffix);
258 print_string("INVALID LITERAL KIND");
262 * Prints a predefined symbol.
264 static void print_funcname(const funcname_expression_t *funcname)
267 switch (funcname->kind) {
268 case FUNCNAME_FUNCTION: s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
269 case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
270 case FUNCNAME_FUNCSIG: s = "__FUNCSIG__"; break;
271 case FUNCNAME_FUNCDNAME: s = "__FUNCDNAME__"; break;
276 static void print_compound_literal(
277 const compound_literal_expression_t *expression)
280 print_type(expression->type);
282 print_initializer(expression->initializer);
285 static void print_assignment_expression(const expression_t *const expr)
287 print_expression_prec(expr, PREC_ASSIGNMENT);
291 * Prints a call expression.
293 * @param call the call expression
295 static void print_call_expression(const call_expression_t *call)
297 print_expression_prec(call->function, PREC_POSTFIX);
299 char const *sep = "";
300 for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
303 print_assignment_expression(arg->expression);
309 * Prints a binary expression.
311 * @param binexpr the binary expression
313 static void print_binary_expression(const binary_expression_t *binexpr)
315 unsigned prec = get_expression_precedence(binexpr->base.kind);
316 int r2l = right_to_left(prec);
318 print_expression_prec(binexpr->left, prec + r2l);
320 switch (binexpr->base.kind) {
321 case EXPR_BINARY_COMMA: op = ", "; break;
322 case EXPR_BINARY_ASSIGN: op = " = "; break;
323 case EXPR_BINARY_ADD: op = " + "; break;
324 case EXPR_BINARY_SUB: op = " - "; break;
325 case EXPR_BINARY_MUL: op = " * "; break;
326 case EXPR_BINARY_MOD: op = " % "; break;
327 case EXPR_BINARY_DIV: op = " / "; break;
328 case EXPR_BINARY_BITWISE_OR: op = " | "; break;
329 case EXPR_BINARY_BITWISE_AND: op = " & "; break;
330 case EXPR_BINARY_BITWISE_XOR: op = " ^ "; break;
331 case EXPR_BINARY_LOGICAL_OR: op = " || "; break;
332 case EXPR_BINARY_LOGICAL_AND: op = " && "; break;
333 case EXPR_BINARY_NOTEQUAL: op = " != "; break;
334 case EXPR_BINARY_EQUAL: op = " == "; break;
335 case EXPR_BINARY_LESS: op = " < "; break;
336 case EXPR_BINARY_LESSEQUAL: op = " <= "; break;
337 case EXPR_BINARY_GREATER: op = " > "; break;
338 case EXPR_BINARY_GREATEREQUAL: op = " >= "; break;
339 case EXPR_BINARY_SHIFTLEFT: op = " << "; break;
340 case EXPR_BINARY_SHIFTRIGHT: op = " >> "; break;
342 case EXPR_BINARY_ADD_ASSIGN: op = " += "; break;
343 case EXPR_BINARY_SUB_ASSIGN: op = " -= "; break;
344 case EXPR_BINARY_MUL_ASSIGN: op = " *= "; break;
345 case EXPR_BINARY_MOD_ASSIGN: op = " %= "; break;
346 case EXPR_BINARY_DIV_ASSIGN: op = " /= "; break;
347 case EXPR_BINARY_BITWISE_OR_ASSIGN: op = " |= "; break;
348 case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= "; break;
349 case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= "; break;
350 case EXPR_BINARY_SHIFTLEFT_ASSIGN: op = " <<= "; break;
351 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: op = " >>= "; break;
352 default: panic("invalid binexpression found");
355 print_expression_prec(binexpr->right, prec + 1 - r2l);
359 * Prints an unary expression.
361 * @param unexpr the unary expression
363 static void print_unary_expression(const unary_expression_t *unexpr)
365 unsigned prec = get_expression_precedence(unexpr->base.kind);
366 switch (unexpr->base.kind) {
367 case EXPR_UNARY_NEGATE: print_char ('-' ); break;
368 case EXPR_UNARY_PLUS: print_char ('+' ); break;
369 case EXPR_UNARY_NOT: print_char ('!' ); break;
370 case EXPR_UNARY_BITWISE_NEGATE: print_char ('~' ); break;
371 case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
372 case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
373 case EXPR_UNARY_DEREFERENCE: print_char ('*' ); break;
374 case EXPR_UNARY_TAKE_ADDRESS: print_char ('&' ); break;
375 case EXPR_UNARY_DELETE: print_string("delete "); break;
376 case EXPR_UNARY_DELETE_ARRAY: print_string("delete [] "); break;
378 case EXPR_UNARY_POSTFIX_INCREMENT:
379 print_expression_prec(unexpr->value, prec);
382 case EXPR_UNARY_POSTFIX_DECREMENT:
383 print_expression_prec(unexpr->value, prec);
386 case EXPR_UNARY_CAST:
388 print_type(unexpr->base.type);
391 case EXPR_UNARY_ASSUME:
392 print_string("__assume(");
393 print_assignment_expression(unexpr->value);
397 case EXPR_UNARY_THROW:
398 if (unexpr->value == NULL) {
399 print_string("throw");
402 print_string("throw ");
406 panic("invalid unary expression found");
408 print_expression_prec(unexpr->value, prec);
412 * Prints a reference expression.
414 * @param ref the reference expression
416 static void print_reference_expression(const reference_expression_t *ref)
418 print_string(ref->entity->base.symbol->string);
422 * Prints a label address expression.
424 * @param ref the reference expression
426 static void print_label_address_expression(const label_address_expression_t *le)
428 print_format("&&%s", le->label->base.symbol->string);
432 * Prints an array expression.
434 * @param expression the array expression
436 static void print_array_expression(const array_access_expression_t *expression)
438 if (!expression->flipped) {
439 print_expression_prec(expression->array_ref, PREC_POSTFIX);
441 print_expression(expression->index);
444 print_expression_prec(expression->index, PREC_POSTFIX);
446 print_expression(expression->array_ref);
452 * Prints a typeproperty expression (sizeof or __alignof__).
454 * @param expression the type property expression
456 static void print_typeprop_expression(const typeprop_expression_t *expression)
458 switch (expression->base.kind) {
459 case EXPR_SIZEOF: print_string("sizeof"); break;
460 case EXPR_ALIGNOF: print_string("__alignof__"); break;
461 default: panic("invalid typeprop kind");
463 if (expression->tp_expression != NULL) {
464 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
465 print_expression_prec(expression->tp_expression, PREC_TOP);
468 print_type(expression->type);
474 * Prints a builtin constant expression.
476 * @param expression the builtin constant expression
478 static void print_builtin_constant(const builtin_constant_expression_t *expression)
480 print_string("__builtin_constant_p(");
481 print_assignment_expression(expression->value);
486 * Prints a builtin types compatible expression.
488 * @param expression the builtin types compatible expression
490 static void print_builtin_types_compatible(
491 const builtin_types_compatible_expression_t *expression)
493 print_string("__builtin_types_compatible_p(");
494 print_type(expression->left);
496 print_type(expression->right);
501 * Prints a conditional expression.
503 * @param expression the conditional expression
505 static void print_conditional(const conditional_expression_t *expression)
507 print_expression_prec(expression->condition, PREC_LOGICAL_OR);
508 if (expression->true_expression != NULL) {
510 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
513 print_string(" ?: ");
515 precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
516 print_expression_prec(expression->false_expression, prec);
520 * Prints a va_start expression.
522 * @param expression the va_start expression
524 static void print_va_start(const va_start_expression_t *const expression)
526 print_string("__builtin_va_start(");
527 print_assignment_expression(expression->ap);
529 print_assignment_expression(expression->parameter);
534 * Prints a va_arg expression.
536 * @param expression the va_arg expression
538 static void print_va_arg(const va_arg_expression_t *expression)
540 print_string("__builtin_va_arg(");
541 print_assignment_expression(expression->ap);
543 print_type(expression->base.type);
548 * Prints a va_copy expression.
550 * @param expression the va_copy expression
552 static void print_va_copy(const va_copy_expression_t *expression)
554 print_string("__builtin_va_copy(");
555 print_assignment_expression(expression->dst);
557 print_assignment_expression(expression->src);
562 * Prints a select expression (. or ->).
564 * @param expression the select expression
566 static void print_select(const select_expression_t *expression)
568 print_expression_prec(expression->compound, PREC_POSTFIX);
569 /* do not print anything for anonymous struct/union selects
570 * FIXME: if the anonymous select was a '->' this will print '.'
572 if (expression->compound_entry->base.symbol == NULL)
575 if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
580 print_string(expression->compound_entry->base.symbol->string);
584 * Prints a type classify expression.
586 * @param expr the type classify expression
588 static void print_classify_type_expression(
589 const classify_type_expression_t *const expr)
591 print_string("__builtin_classify_type(");
592 print_assignment_expression(expr->type_expression);
597 * Prints a designator.
599 * @param designator the designator
601 static void print_designator(const designator_t *designator)
603 for ( ; designator != NULL; designator = designator->next) {
604 if (designator->symbol == NULL) {
606 print_expression(designator->array_index);
610 print_string(designator->symbol->string);
616 * Prints an offsetof expression.
618 * @param expression the offset expression
620 static void print_offsetof_expression(const offsetof_expression_t *expression)
622 print_string("__builtin_offsetof(");
623 print_type(expression->type);
625 print_designator(expression->designator);
630 * Prints a statement expression.
632 * @param expression the statement expression
634 static void print_statement_expression(const statement_expression_t *expression)
637 print_statement(expression->statement);
641 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
643 if (expr->base.parenthesized)
646 if (top_prec > get_expression_precedence(expr->base.kind))
649 if (print_parenthesis && top_prec != PREC_BOTTOM) {
650 switch (expr->kind) {
651 case EXPR_ENUM_CONSTANT:
653 case EXPR_LITERAL_CASES:
654 case EXPR_LITERAL_CHARACTER:
656 case EXPR_STRING_LITERAL:
657 /* Do not print () around subexpressions consisting of a single token. */
669 * Prints an expression with parenthesis if needed.
671 * @param expression the expression to print
672 * @param top_prec the precedence of the user of this expression.
674 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
676 if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
677 expr = expr->unary.value;
680 bool const parenthesized = needs_parentheses(expr, top_prec);
684 switch (expr->kind) {
686 case EXPR_SIZEOF: print_typeprop_expression( &expr->typeprop); break;
687 case EXPR_ARRAY_ACCESS: print_array_expression( &expr->array_access); break;
688 case EXPR_BINARY_CASES: print_binary_expression( &expr->binary); break;
689 case EXPR_BUILTIN_CONSTANT_P: print_builtin_constant( &expr->builtin_constant); break;
690 case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
691 case EXPR_CALL: print_call_expression( &expr->call); break;
692 case EXPR_CLASSIFY_TYPE: print_classify_type_expression(&expr->classify_type); break;
693 case EXPR_COMPOUND_LITERAL: print_compound_literal( &expr->compound_literal); break;
694 case EXPR_CONDITIONAL: print_conditional( &expr->conditional); break;
695 case EXPR_ERROR: print_string("$error$"); break;
696 case EXPR_FUNCNAME: print_funcname( &expr->funcname); break;
697 case EXPR_LABEL_ADDRESS: print_label_address_expression(&expr->label_address); break;
698 case EXPR_LITERAL_CASES: print_literal( &expr->literal); break;
699 case EXPR_LITERAL_CHARACTER: print_string_literal( &expr->string_literal, '\''); break;
700 case EXPR_OFFSETOF: print_offsetof_expression( &expr->offsetofe); break;
702 case EXPR_ENUM_CONSTANT: print_reference_expression( &expr->reference); break;
703 case EXPR_SELECT: print_select( &expr->select); break;
704 case EXPR_STATEMENT: print_statement_expression( &expr->statement); break;
705 case EXPR_STRING_LITERAL: print_string_literal( &expr->string_literal, '"'); break;
706 case EXPR_UNARY_CASES: print_unary_expression( &expr->unary); break;
707 case EXPR_VA_ARG: print_va_arg( &expr->va_arge); break;
708 case EXPR_VA_COPY: print_va_copy( &expr->va_copye); break;
709 case EXPR_VA_START: print_va_start( &expr->va_starte); break;
715 static void print_indented_statement(statement_t const *const stmt)
717 switch (stmt->kind) {
718 case STATEMENT_LABEL:
721 case STATEMENT_CASE_LABEL:
722 for (int i = 0; i != case_indent; ++i)
730 print_statement(stmt);
734 * Print an compound statement.
736 * @param block the compound statement
738 static void print_compound_statement(const compound_statement_t *block)
743 for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
744 print_indented_statement(stmt);
754 * Print a return statement.
756 * @param statement the return statement
758 static void print_return_statement(const return_statement_t *statement)
760 expression_t const *const val = statement->value;
762 print_string("return ");
763 print_expression(val);
766 print_string("return;");
771 * Print an expression statement.
773 * @param statement the expression statement
775 static void print_expression_statement(const expression_statement_t *statement)
777 print_expression(statement->expression);
782 * Print a computed goto statement.
784 * @param statement the computed goto statement
786 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
788 print_string("goto *");
789 print_expression(stmt->expression);
794 * Print a goto statement.
796 * @param statement the goto statement
798 static void print_goto_statement(const goto_statement_t *statement)
800 print_string("goto ");
801 print_string(statement->label->base.symbol->string);
806 * Print a label statement.
808 * @param statement the label statement
810 static void print_label_statement(const label_statement_t *statement)
812 print_format("%s:\n", statement->label->base.symbol->string);
813 print_indented_statement(statement->statement);
816 static void print_inner_statement(statement_t const *const stmt)
818 if (stmt->kind == STATEMENT_COMPOUND) {
820 print_compound_statement(&stmt->compound);
824 print_indented_statement(stmt);
829 static void print_after_inner_statement(statement_t const *const stmt)
831 if (stmt->kind == STATEMENT_COMPOUND) {
840 * Print an if statement.
842 * @param statement the if statement
844 static void print_if_statement(const if_statement_t *statement)
846 print_string("if (");
847 print_expression(statement->condition);
849 print_inner_statement(statement->true_statement);
851 statement_t const *const f = statement->false_statement;
853 print_after_inner_statement(statement->true_statement);
854 print_string("else");
855 if (f->kind == STATEMENT_IF) {
857 print_if_statement(&f->ifs);
859 print_inner_statement(f);
865 * Print a switch statement.
867 * @param statement the switch statement
869 static void print_switch_statement(const switch_statement_t *statement)
871 int const old_case_indent = case_indent;
872 case_indent = indent;
874 print_string("switch (");
875 print_expression(statement->expression);
877 print_inner_statement(statement->body);
879 case_indent = old_case_indent;
883 * Print a case label (including the default label).
885 * @param statement the case label statement
887 static void print_case_label(const case_label_statement_t *statement)
889 if (statement->expression == NULL) {
890 print_string("default:\n");
892 print_string("case ");
893 print_expression(statement->expression);
894 if (statement->end_range != NULL) {
895 print_string(" ... ");
896 print_expression(statement->end_range);
900 print_indented_statement(statement->statement);
903 static void print_typedef(const entity_t *entity)
905 print_string("typedef ");
906 print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
911 * returns true if the entity is a compiler generated one and has no real
912 * correspondenc in the source file
914 static bool is_generated_entity(const entity_t *entity)
916 if (entity->kind == ENTITY_TYPEDEF)
917 return entity->typedefe.builtin;
919 if (is_declaration(entity))
920 return entity->declaration.implicit;
926 * Print a declaration statement.
928 * @param statement the statement
930 static void print_declaration_statement(
931 const declaration_statement_t *statement)
934 entity_t *entity = statement->declarations_begin;
935 if (entity == NULL) {
936 print_string("/* empty declaration statement */");
940 entity_t *const end = statement->declarations_end->base.next;
941 for (; entity != end; entity = entity->base.next) {
942 if (entity->kind == ENTITY_ENUM_VALUE)
944 if (is_generated_entity(entity))
954 print_entity(entity);
959 * Print a while statement.
961 * @param statement the statement
963 static void print_while_statement(const while_statement_t *statement)
965 print_string("while (");
966 print_expression(statement->condition);
968 print_inner_statement(statement->body);
972 * Print a do-while statement.
974 * @param statement the statement
976 static void print_do_while_statement(const do_while_statement_t *statement)
979 print_inner_statement(statement->body);
980 print_after_inner_statement(statement->body);
981 print_string("while (");
982 print_expression(statement->condition);
987 * Print a for statement.
989 * @param statement the statement
991 static void print_for_statement(const for_statement_t *statement)
993 print_string("for (");
994 if (statement->initialisation != NULL) {
995 print_expression(statement->initialisation);
998 entity_t const *entity = statement->scope.entities;
999 for (; entity != NULL; entity = entity->base.next) {
1000 if (is_generated_entity(entity))
1002 /* FIXME display of multiple declarations is wrong */
1003 print_declaration(entity);
1006 if (statement->condition != NULL) {
1008 print_expression(statement->condition);
1011 if (statement->step != NULL) {
1013 print_expression(statement->step);
1016 print_inner_statement(statement->body);
1020 * Print assembler arguments.
1022 * @param arguments the arguments
1024 static void print_asm_arguments(asm_argument_t *arguments)
1026 asm_argument_t *argument = arguments;
1027 for (; argument != NULL; argument = argument->next) {
1028 if (argument != arguments)
1031 if (argument->symbol) {
1032 print_format("[%s] ", argument->symbol->string);
1034 print_quoted_string(&argument->constraints, '"');
1036 print_expression(argument->expression);
1042 * Print assembler clobbers.
1044 * @param clobbers the clobbers
1046 static void print_asm_clobbers(asm_clobber_t *clobbers)
1048 asm_clobber_t *clobber = clobbers;
1049 for (; clobber != NULL; clobber = clobber->next) {
1050 if (clobber != clobbers)
1053 print_quoted_string(&clobber->clobber, '"');
1058 * Print an assembler statement.
1060 * @param statement the statement
1062 static void print_asm_statement(const asm_statement_t *statement)
1064 print_string("asm ");
1065 if (statement->is_volatile) {
1066 print_string("volatile ");
1069 print_quoted_string(&statement->asm_text, '"');
1070 if (statement->outputs == NULL &&
1071 statement->inputs == NULL &&
1072 statement->clobbers == NULL)
1073 goto end_of_print_asm_statement;
1075 print_string(" : ");
1076 print_asm_arguments(statement->outputs);
1077 if (statement->inputs == NULL && statement->clobbers == NULL)
1078 goto end_of_print_asm_statement;
1080 print_string(" : ");
1081 print_asm_arguments(statement->inputs);
1082 if (statement->clobbers == NULL)
1083 goto end_of_print_asm_statement;
1085 print_string(" : ");
1086 print_asm_clobbers(statement->clobbers);
1088 end_of_print_asm_statement:
1093 * Print a microsoft __try statement.
1095 * @param statement the statement
1097 static void print_ms_try_statement(const ms_try_statement_t *statement)
1099 print_string("__try");
1100 print_inner_statement(statement->try_statement);
1101 print_after_inner_statement(statement->try_statement);
1102 if (statement->except_expression != NULL) {
1103 print_string("__except(");
1104 print_expression(statement->except_expression);
1107 print_string("__finally");
1109 print_inner_statement(statement->final_statement);
1113 * Print a microsoft __leave statement.
1115 * @param statement the statement
1117 static void print_leave_statement(const leave_statement_t *statement)
1120 print_string("__leave;");
1124 * Print a statement.
1126 * @param statement the statement
1128 void print_statement(statement_t const *const stmt)
1130 switch (stmt->kind) {
1131 case STATEMENT_ASM: print_asm_statement( &stmt->asms); break;
1132 case STATEMENT_BREAK: print_string("break;"); break;
1133 case STATEMENT_CASE_LABEL: print_case_label( &stmt->case_label); break;
1134 case STATEMENT_COMPOUND: print_compound_statement( &stmt->compound); break;
1135 case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1136 case STATEMENT_CONTINUE: print_string("continue;"); break;
1137 case STATEMENT_DECLARATION: print_declaration_statement( &stmt->declaration); break;
1138 case STATEMENT_DO_WHILE: print_do_while_statement( &stmt->do_while); break;
1139 case STATEMENT_EMPTY: print_char(';'); break;
1140 case STATEMENT_ERROR: print_string("$error statement$"); break;
1141 case STATEMENT_EXPRESSION: print_expression_statement( &stmt->expression); break;
1142 case STATEMENT_FOR: print_for_statement( &stmt->fors); break;
1143 case STATEMENT_GOTO: print_goto_statement( &stmt->gotos); break;
1144 case STATEMENT_IF: print_if_statement( &stmt->ifs); break;
1145 case STATEMENT_LABEL: print_label_statement( &stmt->label); break;
1146 case STATEMENT_LEAVE: print_leave_statement( &stmt->leave); break;
1147 case STATEMENT_MS_TRY: print_ms_try_statement( &stmt->ms_try); break;
1148 case STATEMENT_RETURN: print_return_statement( &stmt->returns); break;
1149 case STATEMENT_SWITCH: print_switch_statement( &stmt->switchs); break;
1150 case STATEMENT_WHILE: print_while_statement( &stmt->whiles); break;
1155 * Print a storage class.
1157 * @param storage_class the storage class
1159 static void print_storage_class(storage_class_tag_t storage_class)
1161 switch (storage_class) {
1162 case STORAGE_CLASS_NONE: return;
1163 case STORAGE_CLASS_TYPEDEF: print_string("typedef "); return;
1164 case STORAGE_CLASS_EXTERN: print_string("extern "); return;
1165 case STORAGE_CLASS_STATIC: print_string("static "); return;
1166 case STORAGE_CLASS_AUTO: print_string("auto "); return;
1167 case STORAGE_CLASS_REGISTER: print_string("register "); return;
1169 panic("invalid storage class");
1173 * Print an initializer.
1175 * @param initializer the initializer
1177 void print_initializer(const initializer_t *initializer)
1179 if (initializer == NULL) {
1184 switch (initializer->kind) {
1185 case INITIALIZER_STRING:
1186 case INITIALIZER_VALUE:
1187 print_assignment_expression(initializer->value.value);
1190 case INITIALIZER_LIST: {
1192 const initializer_list_t *list = &initializer->list;
1194 for (size_t i = 0 ; i < list->len; ++i) {
1195 const initializer_t *sub_init = list->initializers[i];
1196 print_initializer(list->initializers[i]);
1197 if (i < list->len-1) {
1198 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1206 case INITIALIZER_DESIGNATOR:
1207 print_designator(initializer->designator.designator);
1208 print_string(" = ");
1212 panic("invalid initializer kind found");
1217 * Print microsoft extended declaration modifiers.
1219 static void print_ms_modifiers(const declaration_t *declaration)
1221 if ((c_mode & _MS) == 0)
1224 decl_modifiers_t modifiers = declaration->modifiers;
1226 bool ds_shown = false;
1227 const char *next = "(";
1229 if (declaration->base.kind == ENTITY_VARIABLE) {
1230 variable_t *variable = (variable_t*)declaration;
1231 if (variable->alignment != 0
1232 || variable->get_property_sym != NULL
1233 || variable->put_property_sym != NULL) {
1235 print_string("__declspec");
1239 if (variable->alignment != 0) {
1240 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1242 if (variable->get_property_sym != NULL
1243 || variable->put_property_sym != NULL) {
1245 print_string(next); next = ", "; print_string("property(");
1246 if (variable->get_property_sym != NULL) {
1247 print_format("get=%s", variable->get_property_sym->string);
1250 if (variable->put_property_sym != NULL)
1251 print_format("%sput=%s", comma, variable->put_property_sym->string);
1257 /* DM_FORCEINLINE handled outside. */
1258 if ((modifiers & ~DM_FORCEINLINE) != 0) {
1260 print_string("__declspec");
1263 if (modifiers & DM_DLLIMPORT) {
1264 print_string(next); next = ", "; print_string("dllimport");
1266 if (modifiers & DM_DLLEXPORT) {
1267 print_string(next); next = ", "; print_string("dllexport");
1269 if (modifiers & DM_THREAD) {
1270 print_string(next); next = ", "; print_string("thread");
1272 if (modifiers & DM_NAKED) {
1273 print_string(next); next = ", "; print_string("naked");
1275 if (modifiers & DM_THREAD) {
1276 print_string(next); next = ", "; print_string("thread");
1278 if (modifiers & DM_SELECTANY) {
1279 print_string(next); next = ", "; print_string("selectany");
1281 if (modifiers & DM_NOTHROW) {
1282 print_string(next); next = ", "; print_string("nothrow");
1284 if (modifiers & DM_NORETURN) {
1285 print_string(next); next = ", "; print_string("noreturn");
1287 if (modifiers & DM_NOINLINE) {
1288 print_string(next); next = ", "; print_string("noinline");
1290 if (modifiers & DM_DEPRECATED) {
1291 print_string(next); next = ", "; print_string("deprecated");
1292 if (declaration->deprecated_string != NULL)
1293 print_format("(\"%s\")",
1294 declaration->deprecated_string);
1296 if (modifiers & DM_RESTRICT) {
1297 print_string(next); next = ", "; print_string("restrict");
1299 if (modifiers & DM_NOALIAS) {
1300 print_string(next); next = ", "; print_string("noalias");
1309 static void print_scope(const scope_t *scope)
1311 const entity_t *entity = scope->entities;
1312 for ( ; entity != NULL; entity = entity->base.next) {
1314 print_entity(entity);
1319 static void print_namespace(const namespace_t *namespace)
1321 print_string("namespace ");
1322 if (namespace->base.symbol != NULL) {
1323 print_string(namespace->base.symbol->string);
1327 print_string("{\n");
1330 print_scope(&namespace->members);
1334 print_string("}\n");
1338 * Print a variable or function declaration
1340 void print_declaration(const entity_t *entity)
1342 assert(is_declaration(entity));
1343 const declaration_t *declaration = &entity->declaration;
1345 print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1346 if (entity->kind == ENTITY_FUNCTION) {
1347 function_t *function = (function_t*)declaration;
1348 if (function->is_inline) {
1349 if (declaration->modifiers & DM_FORCEINLINE) {
1350 print_string("__forceinline ");
1351 } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1352 print_string("__inline ");
1354 print_string("inline ");
1358 //print_ms_modifiers(declaration);
1359 switch (entity->kind) {
1360 case ENTITY_FUNCTION:
1361 print_type_ext(entity->declaration.type, entity->base.symbol,
1362 &entity->function.parameters);
1364 if (entity->function.statement != NULL) {
1366 print_indented_statement(entity->function.statement);
1372 case ENTITY_VARIABLE:
1373 if (entity->variable.thread_local)
1374 print_string("__thread ");
1375 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1376 if (entity->variable.initializer != NULL) {
1377 print_string(" = ");
1378 print_initializer(entity->variable.initializer);
1382 case ENTITY_COMPOUND_MEMBER:
1383 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1384 if (entity->compound_member.bitfield) {
1385 print_format(" : %u", entity->compound_member.bit_size);
1390 print_type_ext(declaration->type, declaration->base.symbol, NULL);
1397 * Prints an expression.
1399 * @param expression the expression
1401 void print_expression(const expression_t *expression)
1403 print_expression_prec(expression, PREC_BOTTOM);
1407 * Print a declaration.
1409 * @param declaration the declaration
1411 void print_entity(const entity_t *entity)
1413 if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1416 switch ((entity_kind_tag_t)entity->kind) {
1417 case ENTITY_VARIABLE:
1418 case ENTITY_PARAMETER:
1419 case ENTITY_COMPOUND_MEMBER:
1420 case ENTITY_FUNCTION:
1421 print_declaration(entity);
1423 case ENTITY_TYPEDEF:
1424 print_typedef(entity);
1428 print_string("class ");
1429 print_string(entity->base.symbol->string);
1430 print_string("; /* TODO */\n");
1433 print_string("struct ");
1434 goto print_compound;
1436 print_string("union ");
1438 print_string(entity->base.symbol->string);
1439 if (entity->compound.complete) {
1441 print_compound_definition(&entity->compound);
1446 print_string("enum ");
1447 print_string(entity->base.symbol->string);
1449 print_enum_definition(&entity->enume);
1452 case ENTITY_NAMESPACE:
1453 print_namespace(&entity->namespacee);
1455 case ENTITY_LOCAL_LABEL:
1456 print_string("__label__ ");
1457 print_string(entity->base.symbol->string);
1461 case ENTITY_ENUM_VALUE:
1462 panic("print_entity used on unexpected entity type");
1464 panic("Invalid entity type encountered");
1468 * Print the AST of a translation unit.
1470 * @param unit the translation unit
1472 void print_ast(const translation_unit_t *unit)
1474 entity_t *entity = unit->scope.entities;
1475 for ( ; entity != NULL; entity = entity->base.next) {
1476 if (entity->kind == ENTITY_ENUM_VALUE)
1478 if (entity->base.namespc != NAMESPACE_NORMAL
1479 && entity->base.symbol == NULL)
1481 if (is_generated_entity(entity))
1485 print_entity(entity);
1490 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1492 switch (initializer->kind) {
1493 case INITIALIZER_STRING:
1494 case INITIALIZER_DESIGNATOR:
1495 return EXPR_CLASS_CONSTANT;
1497 case INITIALIZER_VALUE:
1498 return is_linker_constant(initializer->value.value);
1500 case INITIALIZER_LIST: {
1501 expression_classification_t all = EXPR_CLASS_CONSTANT;
1502 for (size_t i = 0; i < initializer->list.len; ++i) {
1503 initializer_t *sub_initializer = initializer->list.initializers[i];
1504 expression_classification_t const cur = is_constant_initializer(sub_initializer);
1512 panic("invalid initializer kind found");
1516 * Checks if an expression references an object with a constant/known location
1517 * to the linker. Example:
1518 * - "x", "*&x" with x being a global variable. The value of x need not be
1519 * constant but the address of x is.
1520 * - "a.b.c" when a has a constant/known location to the linker
1522 static expression_classification_t is_object_with_linker_constant_address(
1523 const expression_t *expression)
1525 switch (expression->kind) {
1526 case EXPR_UNARY_DEREFERENCE:
1527 return is_linker_constant(expression->unary.value);
1530 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1531 if (is_type_pointer(base_type)) {
1533 return is_linker_constant(expression->select.compound);
1535 return is_object_with_linker_constant_address(expression->select.compound);
1539 case EXPR_ARRAY_ACCESS: {
1540 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1541 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1542 return ref < idx ? ref : idx;
1545 case EXPR_REFERENCE: {
1546 entity_t *entity = expression->reference.entity;
1547 if (!is_declaration(entity))
1548 return EXPR_CLASS_VARIABLE;
1550 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1551 case STORAGE_CLASS_NONE:
1552 case STORAGE_CLASS_EXTERN:
1553 case STORAGE_CLASS_STATIC:
1555 entity->kind != ENTITY_VARIABLE ||
1556 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1557 EXPR_CLASS_VARIABLE;
1559 case STORAGE_CLASS_REGISTER:
1560 case STORAGE_CLASS_TYPEDEF:
1561 case STORAGE_CLASS_AUTO:
1564 return EXPR_CLASS_VARIABLE;
1568 return EXPR_CLASS_ERROR;
1571 return EXPR_CLASS_VARIABLE;
1575 expression_classification_t is_linker_constant(const expression_t *expression)
1577 switch (expression->kind) {
1578 case EXPR_STRING_LITERAL:
1580 case EXPR_LABEL_ADDRESS:
1581 return EXPR_CLASS_CONSTANT;
1583 case EXPR_COMPOUND_LITERAL:
1584 return is_constant_initializer(expression->compound_literal.initializer);
1586 case EXPR_UNARY_TAKE_ADDRESS:
1587 return is_object_with_linker_constant_address(expression->unary.value);
1589 case EXPR_UNARY_DEREFERENCE: {
1591 = revert_automatic_type_conversion(expression->unary.value);
1592 /* dereferencing a function is a NOP */
1593 if (is_type_function(real_type)) {
1594 return is_linker_constant(expression->unary.value);
1599 case EXPR_UNARY_CAST: {
1600 type_t *dest = skip_typeref(expression->base.type);
1601 if (!is_type_pointer(dest) && (
1602 dest->kind != TYPE_ATOMIC ||
1603 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1604 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1606 return is_constant_expression(expression);
1608 return is_linker_constant(expression->unary.value);
1611 case EXPR_BINARY_ADD:
1612 case EXPR_BINARY_SUB: {
1613 expression_t *const left = expression->binary.left;
1614 expression_t *const right = expression->binary.right;
1615 type_t *const ltype = skip_typeref(left->base.type);
1616 type_t *const rtype = skip_typeref(right->base.type);
1618 if (is_type_pointer(ltype)) {
1619 expression_classification_t const l = is_linker_constant(left);
1620 expression_classification_t const r = is_constant_expression(right);
1621 return l < r ? l : r;
1622 } else if (is_type_pointer(rtype)) {
1623 expression_classification_t const l = is_constant_expression(left);
1624 expression_classification_t const r = is_linker_constant(right);
1625 return l < r ? l : r;
1626 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1627 return EXPR_CLASS_ERROR;
1629 return is_constant_expression(expression);
1633 case EXPR_REFERENCE: {
1634 entity_t *entity = expression->reference.entity;
1635 if (!is_declaration(entity))
1636 return EXPR_CLASS_VARIABLE;
1638 type_t *type = skip_typeref(entity->declaration.type);
1639 if (is_type_function(type))
1640 return EXPR_CLASS_CONSTANT;
1641 if (is_type_array(type)) {
1642 return is_object_with_linker_constant_address(expression);
1644 /* Prevent stray errors */
1645 if (!is_type_valid(type))
1646 return EXPR_CLASS_ERROR;
1647 return EXPR_CLASS_VARIABLE;
1650 case EXPR_ARRAY_ACCESS: {
1651 type_t *const type =
1652 skip_typeref(revert_automatic_type_conversion(expression));
1653 if (!is_type_array(type))
1654 return EXPR_CLASS_VARIABLE;
1655 return is_linker_constant(expression->array_access.array_ref);
1658 case EXPR_CONDITIONAL: {
1659 expression_t *const c = expression->conditional.condition;
1660 expression_classification_t const cclass = is_constant_expression(c);
1661 if (cclass != EXPR_CLASS_CONSTANT)
1664 if (fold_constant_to_bool(c)) {
1665 expression_t const *const t = expression->conditional.true_expression;
1666 return is_linker_constant(t != NULL ? t : c);
1668 return is_linker_constant(expression->conditional.false_expression);
1673 entity_t *entity = expression->select.compound_entry;
1674 if (!is_declaration(entity))
1675 return EXPR_CLASS_VARIABLE;
1676 type_t *type = skip_typeref(entity->declaration.type);
1677 if (is_type_array(type)) {
1678 /* arrays automatically convert to their address */
1679 expression_t *compound = expression->select.compound;
1680 type_t *base_type = skip_typeref(compound->base.type);
1681 if (is_type_pointer(base_type)) {
1683 return is_linker_constant(compound);
1685 return is_object_with_linker_constant_address(compound);
1688 return EXPR_CLASS_VARIABLE;
1692 return is_constant_expression(expression);
1697 * Check if the given expression is a call to a builtin function
1698 * returning a constant result.
1700 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1702 expression_t *function = expression->call.function;
1703 if (function->kind != EXPR_REFERENCE)
1704 return EXPR_CLASS_VARIABLE;
1705 reference_expression_t *ref = &function->reference;
1706 if (ref->entity->kind != ENTITY_FUNCTION)
1707 return EXPR_CLASS_VARIABLE;
1709 switch (ref->entity->function.btk) {
1712 return EXPR_CLASS_CONSTANT;
1714 return EXPR_CLASS_VARIABLE;
1719 static expression_classification_t is_constant_pointer(const expression_t *expression)
1721 expression_classification_t const expr_class = is_constant_expression(expression);
1722 if (expr_class != EXPR_CLASS_VARIABLE)
1725 switch (expression->kind) {
1726 case EXPR_UNARY_CAST:
1727 return is_constant_pointer(expression->unary.value);
1729 return EXPR_CLASS_VARIABLE;
1733 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1735 switch (expression->kind) {
1737 expression_t *compound = expression->select.compound;
1738 type_t *compound_type = compound->base.type;
1739 compound_type = skip_typeref(compound_type);
1740 if (is_type_pointer(compound_type)) {
1741 return is_constant_pointer(compound);
1743 return is_object_with_constant_address(compound);
1747 case EXPR_ARRAY_ACCESS: {
1748 array_access_expression_t const* const array_access =
1749 &expression->array_access;
1750 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1751 if (idx_class != EXPR_CLASS_CONSTANT)
1753 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1754 expression_classification_t const ref_ptr = is_constant_pointer(array_access->array_ref);
1755 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1758 case EXPR_UNARY_DEREFERENCE:
1759 return is_constant_pointer(expression->unary.value);
1762 return EXPR_CLASS_ERROR;
1765 return EXPR_CLASS_VARIABLE;
1769 expression_classification_t is_constant_expression(const expression_t *expression)
1771 switch (expression->kind) {
1772 case EXPR_LITERAL_CASES:
1773 case EXPR_LITERAL_CHARACTER:
1774 case EXPR_CLASSIFY_TYPE:
1777 case EXPR_BUILTIN_CONSTANT_P:
1778 case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1779 case EXPR_ENUM_CONSTANT:
1780 return EXPR_CLASS_CONSTANT;
1783 type_t *const type = skip_typeref(expression->typeprop.type);
1785 !is_type_array(type) || !type->array.is_vla ? EXPR_CLASS_CONSTANT :
1786 EXPR_CLASS_VARIABLE;
1789 case EXPR_STRING_LITERAL:
1791 case EXPR_LABEL_ADDRESS:
1796 case EXPR_STATEMENT:
1797 case EXPR_UNARY_POSTFIX_INCREMENT:
1798 case EXPR_UNARY_POSTFIX_DECREMENT:
1799 case EXPR_UNARY_PREFIX_INCREMENT:
1800 case EXPR_UNARY_PREFIX_DECREMENT:
1801 case EXPR_UNARY_ASSUME: /* has VOID type */
1802 case EXPR_UNARY_DEREFERENCE:
1803 case EXPR_UNARY_DELETE:
1804 case EXPR_UNARY_DELETE_ARRAY:
1805 case EXPR_UNARY_THROW:
1806 case EXPR_BINARY_ASSIGN:
1807 case EXPR_BINARY_MUL_ASSIGN:
1808 case EXPR_BINARY_DIV_ASSIGN:
1809 case EXPR_BINARY_MOD_ASSIGN:
1810 case EXPR_BINARY_ADD_ASSIGN:
1811 case EXPR_BINARY_SUB_ASSIGN:
1812 case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1813 case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1814 case EXPR_BINARY_BITWISE_AND_ASSIGN:
1815 case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1816 case EXPR_BINARY_BITWISE_OR_ASSIGN:
1817 case EXPR_BINARY_COMMA:
1818 case EXPR_ARRAY_ACCESS:
1819 return EXPR_CLASS_VARIABLE;
1821 case EXPR_REFERENCE: {
1822 type_t *const type = skip_typeref(expression->base.type);
1823 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1826 case EXPR_UNARY_TAKE_ADDRESS:
1827 return is_object_with_constant_address(expression->unary.value);
1830 return is_builtin_const_call(expression);
1832 case EXPR_UNARY_NEGATE:
1833 case EXPR_UNARY_PLUS:
1834 case EXPR_UNARY_BITWISE_NEGATE:
1835 case EXPR_UNARY_NOT:
1836 return is_constant_expression(expression->unary.value);
1838 case EXPR_UNARY_CAST: {
1839 type_t *const type = skip_typeref(expression->base.type);
1840 if (is_type_scalar(type))
1841 return is_constant_expression(expression->unary.value);
1842 if (!is_type_valid(type))
1843 return EXPR_CLASS_ERROR;
1844 return EXPR_CLASS_VARIABLE;
1847 case EXPR_BINARY_ADD:
1848 case EXPR_BINARY_SUB:
1849 case EXPR_BINARY_MUL:
1850 case EXPR_BINARY_DIV:
1851 case EXPR_BINARY_MOD:
1852 case EXPR_BINARY_EQUAL:
1853 case EXPR_BINARY_NOTEQUAL:
1854 case EXPR_BINARY_LESS:
1855 case EXPR_BINARY_LESSEQUAL:
1856 case EXPR_BINARY_GREATER:
1857 case EXPR_BINARY_GREATEREQUAL:
1858 case EXPR_BINARY_BITWISE_AND:
1859 case EXPR_BINARY_BITWISE_OR:
1860 case EXPR_BINARY_BITWISE_XOR:
1861 case EXPR_BINARY_SHIFTLEFT:
1862 case EXPR_BINARY_SHIFTRIGHT:
1863 case EXPR_BINARY_ISGREATER:
1864 case EXPR_BINARY_ISGREATEREQUAL:
1865 case EXPR_BINARY_ISLESS:
1866 case EXPR_BINARY_ISLESSEQUAL:
1867 case EXPR_BINARY_ISLESSGREATER:
1868 case EXPR_BINARY_ISUNORDERED: {
1869 expression_classification_t const l = is_constant_expression(expression->binary.left);
1870 expression_classification_t const r = is_constant_expression(expression->binary.right);
1871 return l < r ? l : r;
1874 case EXPR_BINARY_LOGICAL_AND: {
1875 expression_t const *const left = expression->binary.left;
1876 expression_classification_t const lclass = is_constant_expression(left);
1877 if (lclass != EXPR_CLASS_CONSTANT)
1879 if (!fold_constant_to_bool(left))
1880 return EXPR_CLASS_CONSTANT;
1881 return is_constant_expression(expression->binary.right);
1884 case EXPR_BINARY_LOGICAL_OR: {
1885 expression_t const *const left = expression->binary.left;
1886 expression_classification_t const lclass = is_constant_expression(left);
1887 if (lclass != EXPR_CLASS_CONSTANT)
1889 if (fold_constant_to_bool(left))
1890 return EXPR_CLASS_CONSTANT;
1891 return is_constant_expression(expression->binary.right);
1894 case EXPR_COMPOUND_LITERAL:
1895 return is_constant_initializer(expression->compound_literal.initializer);
1897 case EXPR_CONDITIONAL: {
1898 expression_t *const condition = expression->conditional.condition;
1899 expression_classification_t const cclass = is_constant_expression(condition);
1900 if (cclass != EXPR_CLASS_CONSTANT)
1903 if (fold_constant_to_bool(condition)) {
1904 expression_t const *const t = expression->conditional.true_expression;
1905 return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1907 return is_constant_expression(expression->conditional.false_expression);
1912 return EXPR_CLASS_ERROR;
1914 panic("invalid expression found (is constant expression)");
1919 obstack_init(&ast_obstack);
1924 obstack_free(&ast_obstack, NULL);