X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=type.c;h=7a5272a709e7b5235f1b9cf65768faacd2a30187;hb=99f5a3cd09e0d7d6127751fc9f6550b5dcbbbd33;hp=4c1612c2c204806acdecc80f45b52d72b535d196;hpb=1c030e37ec4ee92e8ec7786dac4d41124099efbc;p=cparser diff --git a/type.c b/type.c index 4c1612c..7a5272a 100644 --- a/type.c +++ b/type.c @@ -1,460 +1,1664 @@ +/* + * This file is part of cparser. + * Copyright (C) 2007-2009 Matthias Braun + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ #include #include #include + #include "type_t.h" +#include "types.h" +#include "entity_t.h" +#include "symbol_t.h" #include "type_hash.h" #include "adt/error.h" +#include "adt/util.h" +#include "lang_features.h" +#include "warning.h" +#include "diagnostic.h" +#include "printer.h" + +/** The default calling convention. */ +cc_kind_t default_calling_convention = CC_CDECL; -static struct obstack _type_obst; -struct obstack *type_obst = &_type_obst; -static FILE *out; -static int type_visited = 0; -static bool print_compound_entries; +static struct obstack type_obst; +static bool print_implicit_array_size = false; -static void intern_print_type_pre(type_t *type); -static void intern_print_type_post(type_t *type); +static void intern_print_type_pre(const type_t *type); +static void intern_print_type_post(const type_t *type); -void init_types(void) +/** + * Returns the size of a type node. + * + * @param kind the type kind + */ +static size_t get_type_struct_size(type_kind_t kind) { - obstack_init(type_obst); + static const size_t sizes[] = { + [TYPE_ATOMIC] = sizeof(atomic_type_t), + [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t), + [TYPE_COMPOUND_UNION] = sizeof(compound_type_t), + [TYPE_ENUM] = sizeof(enum_type_t), + [TYPE_FUNCTION] = sizeof(function_type_t), + [TYPE_POINTER] = sizeof(pointer_type_t), + [TYPE_REFERENCE] = sizeof(reference_type_t), + [TYPE_ARRAY] = sizeof(array_type_t), + [TYPE_TYPEDEF] = sizeof(typedef_type_t), + [TYPE_TYPEOF] = sizeof(typeof_type_t), + }; + assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1); + assert(kind <= TYPE_TYPEOF); + assert(sizes[kind] != 0); + return sizes[kind]; } -void exit_types(void) +type_t *allocate_type_zero(type_kind_t kind) { - obstack_free(type_obst, NULL); + size_t const size = get_type_struct_size(kind); + type_t *const res = obstack_alloc(&type_obst, size); + memset(res, 0, size); + res->base.kind = kind; + + return res; } -void type_set_output(FILE *stream) +/** + * Properties of atomic types. + */ +atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = { + [ATOMIC_TYPE_VOID] = { + .size = 1, + .alignment = 1, + .flags = ATOMIC_TYPE_FLAG_NONE, + .rank = 0, + }, + [ATOMIC_TYPE_BOOL] = { + .size = 1, + .alignment = 1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 1, + }, + [ATOMIC_TYPE_CHAR] = { + .size = 1, + .alignment = 1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 2, + }, + [ATOMIC_TYPE_SCHAR] = { + .size = 1, + .alignment = 1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 2, + }, + [ATOMIC_TYPE_UCHAR] = { + .size = 1, + .alignment = 1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 2, + }, + [ATOMIC_TYPE_SHORT] = { + .size = 2, + .alignment = 2, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 3, + }, + [ATOMIC_TYPE_USHORT] = { + .size = 2, + .alignment = 2, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 3, + }, + [ATOMIC_TYPE_INT] = { + .size = (unsigned) -1, + .alignment = (unsigned) -1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 4, + }, + [ATOMIC_TYPE_UINT] = { + .size = (unsigned) -1, + .alignment = (unsigned) -1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 4, + }, + [ATOMIC_TYPE_LONG] = { + .size = (unsigned) -1, + .alignment = (unsigned) -1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 5, + }, + [ATOMIC_TYPE_ULONG] = { + .size = (unsigned) -1, + .alignment = (unsigned) -1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 5, + }, + [ATOMIC_TYPE_LONGLONG] = { + .size = 8, + .alignment = 8, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 6, + }, + [ATOMIC_TYPE_ULONGLONG] = { + .size = 8, + .alignment = 8, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = 6, + }, + [ATOMIC_TYPE_FLOAT] = { + .size = 4, + .alignment = 4, + .flags = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 0, + }, + [ATOMIC_TYPE_DOUBLE] = { + .size = 8, + .alignment = 8, + .flags = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC + | ATOMIC_TYPE_FLAG_SIGNED, + .rank = 0, + }, + [ATOMIC_TYPE_WCHAR_T] = { + .size = (unsigned)-1, + .alignment = (unsigned)-1, + .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC, + .rank = (unsigned)-1, + }, +}; +atomic_type_properties_t pointer_properties = { + .size = 4, + .alignment = 4, + .flags = ATOMIC_TYPE_FLAG_NONE, +}; + +static inline bool is_po2(unsigned x) { - out = stream; + return (x & (x-1)) == 0; } -void set_print_compound_entries(bool enabled) +void init_types(unsigned machine_size) { - print_compound_entries = enabled; + obstack_init(&type_obst); + + atomic_type_properties_t *props = atomic_type_properties; + + /* atempt to set some sane defaults based on machine size */ + + unsigned int_size = machine_size < 32 ? 2 : 4; + unsigned long_size = machine_size < 64 ? 4 : 8; + + props[ATOMIC_TYPE_INT].size = int_size; + props[ATOMIC_TYPE_INT].alignment = int_size; + props[ATOMIC_TYPE_UINT].size = int_size; + props[ATOMIC_TYPE_UINT].alignment = int_size; + props[ATOMIC_TYPE_LONG].size = long_size; + props[ATOMIC_TYPE_LONG].alignment = long_size; + props[ATOMIC_TYPE_ULONG].size = long_size; + props[ATOMIC_TYPE_ULONG].alignment = long_size; + + pointer_properties.size = long_size; + pointer_properties.alignment = long_size; + pointer_properties.struct_alignment = long_size; + + props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE]; + props[ATOMIC_TYPE_WCHAR_T] = props[ATOMIC_TYPE_INT]; + + /* set struct alignments to the same value as alignment */ + for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) { + props[i].struct_alignment = props[i].alignment; + } } -void inc_type_visited(void) +void exit_types(void) { - type_visited++; + obstack_free(&type_obst, NULL); } -static -void print_type_qualifiers(unsigned qualifiers) +void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q) { - if(qualifiers & TYPE_QUALIFIER_CONST) fputs("const ", out); - if(qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out); - if(qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out); - if(qualifiers & TYPE_QUALIFIER_INLINE) fputs("inline ", out); + size_t sep = q & QUAL_SEP_START ? 0 : 1; + if (qualifiers & TYPE_QUALIFIER_CONST) { + print_string(" const" + sep); + sep = 0; + } + if (qualifiers & TYPE_QUALIFIER_VOLATILE) { + print_string(" volatile" + sep); + sep = 0; + } + if (qualifiers & TYPE_QUALIFIER_RESTRICT) { + print_string(" restrict" + sep); + sep = 0; + } + if (sep == 0 && q & QUAL_SEP_END) + print_char(' '); } -static -void print_atomic_type(const atomic_type_t *type) +const char *get_atomic_kind_name(atomic_type_kind_t kind) { - print_type_qualifiers(type->type.qualifiers); - - const char *s; - switch(type->atype) { - case ATOMIC_TYPE_INVALID: s = "INVALIDATOMIC"; break; - case ATOMIC_TYPE_VOID: s = "void"; break; - case ATOMIC_TYPE_BOOL: s = "_Bool"; break; - case ATOMIC_TYPE_CHAR: s = "char"; break; - case ATOMIC_TYPE_SCHAR: s = "signed char"; break; - case ATOMIC_TYPE_UCHAR: s = "unsigned char"; break; - case ATOMIC_TYPE_INT: s = "int"; break; - case ATOMIC_TYPE_UINT: s = "unsigned int"; break; - case ATOMIC_TYPE_SHORT: s = "short"; break; - case ATOMIC_TYPE_USHORT: s = "unsigned short"; break; - case ATOMIC_TYPE_LONG: s = "long"; break; - case ATOMIC_TYPE_ULONG: s = "unsigned long"; break; - case ATOMIC_TYPE_LONGLONG: s = "long long"; break; - case ATOMIC_TYPE_ULONGLONG: s = "unsigned long long"; break; - case ATOMIC_TYPE_LONG_DOUBLE: s = "long double"; break; - case ATOMIC_TYPE_FLOAT: s = "float"; break; - case ATOMIC_TYPE_DOUBLE: s = "double"; break; - default: s = "UNKNOWNATOMIC"; break; + switch(kind) { + case ATOMIC_TYPE_INVALID: break; + case ATOMIC_TYPE_VOID: return "void"; + case ATOMIC_TYPE_WCHAR_T: return "wchar_t"; + case ATOMIC_TYPE_BOOL: return c_mode & _CXX ? "bool" : "_Bool"; + case ATOMIC_TYPE_CHAR: return "char"; + case ATOMIC_TYPE_SCHAR: return "signed char"; + case ATOMIC_TYPE_UCHAR: return "unsigned char"; + case ATOMIC_TYPE_INT: return "int"; + case ATOMIC_TYPE_UINT: return "unsigned int"; + case ATOMIC_TYPE_SHORT: return "short"; + case ATOMIC_TYPE_USHORT: return "unsigned short"; + case ATOMIC_TYPE_LONG: return "long"; + case ATOMIC_TYPE_ULONG: return "unsigned long"; + case ATOMIC_TYPE_LONGLONG: return "long long"; + case ATOMIC_TYPE_ULONGLONG: return "unsigned long long"; + case ATOMIC_TYPE_LONG_DOUBLE: return "long double"; + case ATOMIC_TYPE_FLOAT: return "float"; + case ATOMIC_TYPE_DOUBLE: return "double"; } - fputs(s, out); + return "INVALIDATOMIC"; } -static -void print_method_type_pre(const method_type_t *type) +/** + * Prints the name of an atomic type kinds. + * + * @param kind The type kind. + */ +static void print_atomic_kinds(atomic_type_kind_t kind) { - print_type_qualifiers(type->type.qualifiers); + const char *s = get_atomic_kind_name(kind); + print_string(s); +} - intern_print_type_pre(type->result_type); +/** + * Prints the name of an atomic type. + * + * @param type The type. + */ +static void print_atomic_type(const atomic_type_t *type) +{ + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + print_atomic_kinds(type->akind); +} - /* TODO: don't emit braces if we're the toplevel type... */ - fputc('(', out); +/** + * Prints the name of a complex type. + * + * @param type The type. + */ +static void print_complex_type(const atomic_type_t *type) +{ + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + print_string("_Complex"); + print_atomic_kinds(type->akind); } -static -void print_method_type_post(const method_type_t *type, const context_t *context) +/** + * Prints the name of an imaginary type. + * + * @param type The type. + */ +static void print_imaginary_type(const atomic_type_t *type) { - /* TODO: don't emit braces if we're the toplevel type... */ - intern_print_type_post(type->result_type); - fputc(')', out); + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + print_string("_Imaginary "); + print_atomic_kinds(type->akind); +} - fputc('(', out); +/** + * Print the first part (the prefix) of a type. + * + * @param type The type to print. + */ +static void print_function_type_pre(const function_type_t *type) +{ + switch (type->linkage) { + case LINKAGE_C: + if (c_mode & _CXX) + print_string("extern \"C\" "); + break; - int first = 1; - if(context == NULL) { - method_parameter_t *parameter = type->parameters; + case LINKAGE_CXX: + if (!(c_mode & _CXX)) + print_string("extern \"C++\" "); + break; + } + + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + + intern_print_type_pre(type->return_type); + + cc_kind_t cc = type->calling_convention; +restart: + switch (cc) { + case CC_CDECL: print_string(" __cdecl"); break; + case CC_STDCALL: print_string(" __stdcall"); break; + case CC_FASTCALL: print_string(" __fastcall"); break; + case CC_THISCALL: print_string(" __thiscall"); break; + case CC_DEFAULT: + if (default_calling_convention != CC_CDECL) { + /* show the default calling convention if its not cdecl */ + cc = default_calling_convention; + goto restart; + } + break; + } +} + +/** + * Print the second part (the postfix) of a type. + * + * @param type The type to print. + */ +static void print_function_type_post(const function_type_t *type, + const scope_t *parameters) +{ + print_char('('); + bool first = true; + if (parameters == NULL) { + function_parameter_t *parameter = type->parameters; for( ; parameter != NULL; parameter = parameter->next) { - if(first) { - first = 0; + if (first) { + first = false; } else { - fputs(", ", out); + print_string(", "); } print_type(parameter->type); } } else { - declaration_t *parameter = context->declarations; - for( ; parameter != NULL; parameter = parameter->context_next) { - if(first) { - first = 0; + entity_t *parameter = parameters->entities; + for (; parameter != NULL; parameter = parameter->base.next) { + if (parameter->kind != ENTITY_PARAMETER) + continue; + + if (first) { + first = false; } else { - fputs(", ", out); + print_string(", "); + } + const type_t *const param_type = parameter->declaration.type; + if (param_type == NULL) { + print_string(parameter->base.symbol->string); + } else { + print_type_ext(param_type, parameter->base.symbol, NULL); } - print_type_ext(parameter->type, parameter->symbol, - ¶meter->context); } } - if(type->variadic) { - if(first) { - first = 0; + if (type->variadic) { + if (first) { + first = false; } else { - fputs(", ", out); + print_string(", "); } - fputs("...", out); + print_string("..."); } - if(first && !type->unspecified_parameters) { - fputs("void", out); + if (first && !type->unspecified_parameters) { + print_string("void"); } - fputc(')', out); + print_char(')'); + + intern_print_type_post(type->return_type); } -static -void print_pointer_type_pre(const pointer_type_t *type) +/** + * Prints the prefix part of a pointer type. + * + * @param type The pointer type. + */ +static void print_pointer_type_pre(const pointer_type_t *type) { - intern_print_type_pre(type->points_to); - fputs("*", out); - print_type_qualifiers(type->type.qualifiers); + type_t const *const points_to = type->points_to; + intern_print_type_pre(points_to); + if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION) + print_string(" ("); + variable_t *const variable = type->base_variable; + if (variable != NULL) { + print_string(" __based("); + print_string(variable->base.base.symbol->string); + print_string(") "); + } + print_char('*'); + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START); } +/** + * Prints the postfix part of a pointer type. + * + * @param type The pointer type. + */ static void print_pointer_type_post(const pointer_type_t *type) { - intern_print_type_post(type->points_to); + type_t const *const points_to = type->points_to; + if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION) + print_char(')'); + intern_print_type_post(points_to); +} + +/** + * Prints the prefix part of a reference type. + * + * @param type The reference type. + */ +static void print_reference_type_pre(const reference_type_t *type) +{ + type_t const *const refers_to = type->refers_to; + intern_print_type_pre(refers_to); + if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION) + print_string(" ("); + print_char('&'); +} + +/** + * Prints the postfix part of a reference type. + * + * @param type The reference type. + */ +static void print_reference_type_post(const reference_type_t *type) +{ + type_t const *const refers_to = type->refers_to; + if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION) + print_char(')'); + intern_print_type_post(refers_to); +} + +/** + * Prints the prefix part of an array type. + * + * @param type The array type. + */ +static void print_array_type_pre(const array_type_t *type) +{ + intern_print_type_pre(type->element_type); } +/** + * Prints the postfix part of an array type. + * + * @param type The array type. + */ static void print_array_type_post(const array_type_t *type) { - fputc('[', out); - if(type->is_static) { - fputs("static ", out); + print_char('['); + if (type->is_static) { + print_string("static "); } - print_type_qualifiers(type->type.qualifiers); - if(type->size != NULL) { - print_expression(type->size); + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + if (type->size_expression != NULL + && (print_implicit_array_size || !type->has_implicit_size)) { + print_expression(type->size_expression); } - fputc(']', out); + print_char(']'); + intern_print_type_post(type->element_type); } -void print_enum_definition(const declaration_t *declaration) +void print_enum_definition(const enum_t *enume) { - fputs("{\n", out); + print_string("{\n"); change_indent(1); - declaration_t *entry = declaration->context_next; - for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY; - entry = entry->context_next) { + entity_t *entry = enume->base.next; + for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE; + entry = entry->base.next) { print_indent(); - fprintf(out, "%s", entry->symbol->string); - if(entry->init.initializer != NULL) { - fprintf(out, " = "); - print_initializer(entry->init.initializer); + print_string(entry->base.symbol->string); + if (entry->enum_value.value != NULL) { + print_string(" = "); + print_expression(entry->enum_value.value); } - fprintf(out, ",\n"); + print_string(",\n"); } change_indent(-1); print_indent(); - fputs("}", out); + print_char('}'); } +/** + * Prints an enum type. + * + * @param type The enum type. + */ static void print_type_enum(const enum_type_t *type) { - print_type_qualifiers(type->type.qualifiers); - fputs("enum ", out); + print_type_qualifiers(type->base.base.qualifiers, QUAL_SEP_END); + print_string("enum "); - declaration_t *declaration = type->declaration; - symbol_t *symbol = declaration->symbol; - if(symbol != NULL) { - fputs(symbol->string, out); + enum_t *enume = type->enume; + symbol_t *symbol = enume->base.symbol; + if (symbol != NULL) { + print_string(symbol->string); } else { - print_enum_definition(declaration); + print_enum_definition(enume); } } -void print_compound_definition(const declaration_t *declaration) +void print_compound_definition(const compound_t *compound) { - fputs("{\n", out); + print_string("{\n"); change_indent(1); - declaration_t *iter = declaration->context.declarations; - for( ; iter != NULL; iter = iter->context_next) { + entity_t *entity = compound->members.entities; + for( ; entity != NULL; entity = entity->base.next) { + if (entity->kind != ENTITY_COMPOUND_MEMBER) + continue; + print_indent(); - print_declaration(iter); - fputc('\n', out); + print_entity(entity); + print_char('\n'); } change_indent(-1); print_indent(); - fputs("}", out); + print_char('}'); + if (compound->modifiers & DM_TRANSPARENT_UNION) { + print_string("__attribute__((__transparent_union__))"); + } } -static void print_compound_type(const compound_type_t *type) +/** + * Prints a compound type. + * + * @param kind The name of the compound kind. + * @param type The compound type. + */ +static void print_compound_type(char const *const kind, compound_type_t const *const type) { - print_type_qualifiers(type->type.qualifiers); - - if(type->type.type == TYPE_COMPOUND_STRUCT) { - fputs("struct ", out); - } else { - assert(type->type.type == TYPE_COMPOUND_UNION); - fputs("union ", out); - } + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + print_string(kind); - declaration_t *declaration = type->declaration; - symbol_t *symbol = declaration->symbol; - if(symbol != NULL) { - fputs(symbol->string, out); + compound_t *compound = type->compound; + symbol_t *symbol = compound->base.symbol; + if (symbol != NULL) { + print_string(symbol->string); } else { - print_compound_definition(declaration); + print_compound_definition(compound); } } -static void print_typedef_type_pre(typedef_type_t *type) +/** + * Prints the prefix part of a typedef type. + * + * @param type The typedef type. + */ +static void print_typedef_type_pre(const typedef_type_t *const type) { - fputs(type->declaration->symbol->string, out); + print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END); + print_string(type->typedefe->base.symbol->string); } -static void print_typeof_type_pre(typeof_type_t *type) +/** + * Prints the prefix part of a typeof type. + * + * @param type The typeof type. + */ +static void print_typeof_type_pre(const typeof_type_t *const type) { - fputs("typeof(", out); - if(type->expression != NULL) { - assert(type->typeof_type == NULL); + print_string("typeof("); + if (type->expression != NULL) { print_expression(type->expression); } else { print_type(type->typeof_type); } - fputc(')', out); + print_char(')'); } -static void intern_print_type_pre(type_t *type) +/** + * Prints the prefix part of a type. + * + * @param type The type. + */ +static void intern_print_type_pre(const type_t *const type) { - switch(type->type) { - case TYPE_INVALID: - fputs("invalid", out); - return; - case TYPE_ENUM: - print_type_enum((enum_type_t*) type); - return; - case TYPE_ATOMIC: - print_atomic_type((atomic_type_t*) type); - return; - case TYPE_COMPOUND_STRUCT: - case TYPE_COMPOUND_UNION: - print_compound_type((compound_type_t*) type); - return; - case TYPE_BUILTIN: - fputs(((builtin_type_t*) type)->symbol->string, out); - return; - case TYPE_METHOD: - print_method_type_pre((method_type_t*) type); - return; - case TYPE_POINTER: - print_pointer_type_pre((pointer_type_t*) type); - return; - case TYPE_ARRAY: - return; - case TYPE_TYPEDEF: - print_typedef_type_pre((typedef_type_t*) type); - return; - case TYPE_TYPEOF: - print_typeof_type_pre((typeof_type_t*) type); - return; + switch(type->kind) { + case TYPE_ARRAY: print_array_type_pre( &type->array); return; + case TYPE_ATOMIC: print_atomic_type( &type->atomic); return; + case TYPE_COMPLEX: print_complex_type( &type->atomic); return; + case TYPE_COMPOUND_STRUCT: print_compound_type("struct ", &type->compound); return; + case TYPE_COMPOUND_UNION: print_compound_type("union ", &type->compound); return; + case TYPE_ENUM: print_type_enum( &type->enumt); return; + case TYPE_ERROR: print_string(""); return; + case TYPE_FUNCTION: print_function_type_pre( &type->function); return; + case TYPE_IMAGINARY: print_imaginary_type( &type->atomic); return; + case TYPE_POINTER: print_pointer_type_pre( &type->pointer); return; + case TYPE_REFERENCE: print_reference_type_pre( &type->reference); return; + case TYPE_TYPEDEF: print_typedef_type_pre( &type->typedeft); return; + case TYPE_TYPEOF: print_typeof_type_pre( &type->typeoft); return; } - fputs("unknown", out); + print_string("unknown"); } -static -void intern_print_type_post(type_t *type) +/** + * Prints the postfix part of a type. + * + * @param type The type. + */ +static void intern_print_type_post(const type_t *const type) { - switch(type->type) { - case TYPE_METHOD: - print_method_type_post((const method_type_t*) type, NULL); + switch(type->kind) { + case TYPE_FUNCTION: + print_function_type_post(&type->function, NULL); return; case TYPE_POINTER: - print_pointer_type_post((const pointer_type_t*) type); + print_pointer_type_post(&type->pointer); + return; + case TYPE_REFERENCE: + print_reference_type_post(&type->reference); return; case TYPE_ARRAY: - print_array_type_post((const array_type_t*) type); + print_array_type_post(&type->array); return; - case TYPE_INVALID: + case TYPE_ERROR: case TYPE_ATOMIC: + case TYPE_COMPLEX: + case TYPE_IMAGINARY: case TYPE_ENUM: case TYPE_COMPOUND_STRUCT: case TYPE_COMPOUND_UNION: - case TYPE_BUILTIN: case TYPE_TYPEOF: case TYPE_TYPEDEF: break; } } -void print_type(type_t *type) +void print_type(const type_t *const type) { print_type_ext(type, NULL, NULL); } -void print_type_ext(type_t *type, const symbol_t *symbol, - const context_t *context) +void print_type_ext(const type_t *const type, const symbol_t *symbol, + const scope_t *parameters) { - if(type == NULL) { - fputs("nil type", out); - return; - } - intern_print_type_pre(type); - if(symbol != NULL) { - fputc(' ', out); - fputs(symbol->string, out); + if (symbol != NULL) { + print_char(' '); + print_string(symbol->string); } - if(type->type == TYPE_METHOD) { - print_method_type_post((const method_type_t*) type, context); + if (type->kind == TYPE_FUNCTION) { + print_function_type_post(&type->function, parameters); } else { intern_print_type_post(type); } } -bool type_valid(const type_t *type) +type_t *duplicate_type(const type_t *type) +{ + size_t size = get_type_struct_size(type->kind); + + type_t *const copy = obstack_alloc(&type_obst, size); + memcpy(copy, type, size); + copy->base.firm_type = NULL; + + return copy; +} + +type_t *get_unqualified_type(type_t *type) +{ + assert(!is_typeref(type)); + + if (type->base.qualifiers == TYPE_QUALIFIER_NONE) + return type; + + type_t *unqualified_type = duplicate_type(type); + unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE; + + return identify_new_type(unqualified_type); +} + +type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual) +{ + type_t *type = skip_typeref(orig_type); + + type_t *copy; + if (is_type_array(type)) { + /* For array types the element type has to be adjusted */ + type_t *element_type = type->array.element_type; + type_t *qual_element_type = get_qualified_type(element_type, qual); + + if (qual_element_type == element_type) + return orig_type; + + copy = duplicate_type(type); + copy->array.element_type = qual_element_type; + } else if (is_type_valid(type)) { + if ((type->base.qualifiers & qual) == (int)qual) + return orig_type; + + copy = duplicate_type(type); + copy->base.qualifiers |= qual; + } else { + return type; + } + + return identify_new_type(copy); +} + +static bool test_atomic_type_flag(atomic_type_kind_t kind, + atomic_type_flag_t flag) { - return type->type != TYPE_INVALID; + assert(kind <= ATOMIC_TYPE_LAST); + return (atomic_type_properties[kind].flags & flag) != 0; } bool is_type_integer(const type_t *type) { - if(type->type == TYPE_ENUM) - return 1; + assert(!is_typeref(type)); - if(type->type != TYPE_ATOMIC) - return 0; + if (type->kind == TYPE_ENUM) + return true; + if (type->kind != TYPE_ATOMIC) + return false; - atomic_type_t *atomic_type = (atomic_type_t*) type; - switch(atomic_type->atype) { - case ATOMIC_TYPE_BOOL: - case ATOMIC_TYPE_CHAR: - case ATOMIC_TYPE_SCHAR: - case ATOMIC_TYPE_UCHAR: - case ATOMIC_TYPE_SHORT: - case ATOMIC_TYPE_USHORT: - case ATOMIC_TYPE_INT: - case ATOMIC_TYPE_UINT: - case ATOMIC_TYPE_LONG: - case ATOMIC_TYPE_ULONG: - case ATOMIC_TYPE_LONGLONG: - case ATOMIC_TYPE_ULONGLONG: - return 1; + return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER); +} + +bool is_type_enum(const type_t *type) +{ + assert(!is_typeref(type)); + return type->kind == TYPE_ENUM; +} + +bool is_type_float(const type_t *type) +{ + assert(!is_typeref(type)); + + if (type->kind != TYPE_ATOMIC) + return false; + + return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT); +} + +bool is_type_complex(const type_t *type) +{ + assert(!is_typeref(type)); + + if (type->kind != TYPE_ATOMIC) + return false; + + return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX); +} + +bool is_type_signed(const type_t *type) +{ + assert(!is_typeref(type)); + + /* enum types are int for now */ + if (type->kind == TYPE_ENUM) + return true; + if (type->kind != TYPE_ATOMIC) + return false; + + return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED); +} + +bool is_type_arithmetic(const type_t *type) +{ + assert(!is_typeref(type)); + + switch(type->kind) { + case TYPE_ENUM: + return true; + case TYPE_ATOMIC: + case TYPE_COMPLEX: + case TYPE_IMAGINARY: + return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC); default: - return 0; + return false; + } +} + +bool is_type_real(const type_t *type) +{ + /* 6.2.5 (17) */ + return is_type_integer(type) || is_type_float(type); +} + +bool is_type_scalar(const type_t *type) +{ + assert(!is_typeref(type)); + + if (type->kind == TYPE_POINTER) + return true; + + return is_type_arithmetic(type); +} + +bool is_type_incomplete(const type_t *type) +{ + assert(!is_typeref(type)); + + switch(type->kind) { + case TYPE_COMPOUND_STRUCT: + case TYPE_COMPOUND_UNION: { + const compound_type_t *compound_type = &type->compound; + return !compound_type->compound->complete; } + case TYPE_ENUM: + return false; + + case TYPE_ARRAY: + return type->array.size_expression == NULL + && !type->array.size_constant; + + case TYPE_ATOMIC: + case TYPE_IMAGINARY: + case TYPE_COMPLEX: + return type->atomic.akind == ATOMIC_TYPE_VOID; + + case TYPE_FUNCTION: + case TYPE_POINTER: + case TYPE_REFERENCE: + case TYPE_ERROR: + return false; + + case TYPE_TYPEDEF: + case TYPE_TYPEOF: + panic("is_type_incomplete called without typerefs skipped"); + } + + panic("invalid type found"); } -bool is_type_floating(const type_t *type) +bool is_type_object(const type_t *type) { - if(type->type != TYPE_ATOMIC) + return !is_type_function(type) && !is_type_incomplete(type); +} + +/** + * Check if two function types are compatible. + */ +static bool function_types_compatible(const function_type_t *func1, + const function_type_t *func2) +{ + const type_t* const ret1 = skip_typeref(func1->return_type); + const type_t* const ret2 = skip_typeref(func2->return_type); + if (!types_compatible(ret1, ret2)) + return false; + + if (func1->linkage != func2->linkage) + return false; + + cc_kind_t cc1 = func1->calling_convention; + if (cc1 == CC_DEFAULT) + cc1 = default_calling_convention; + cc_kind_t cc2 = func2->calling_convention; + if (cc2 == CC_DEFAULT) + cc2 = default_calling_convention; + + if (cc1 != cc2) + return false; + + if (func1->variadic != func2->variadic) + return false; + + /* can parameters be compared? */ + if ((func1->unspecified_parameters && !func1->kr_style_parameters) + || (func2->unspecified_parameters && !func2->kr_style_parameters)) + return true; + + /* TODO: handling of unspecified parameters not correct yet */ + + /* all argument types must be compatible */ + function_parameter_t *parameter1 = func1->parameters; + function_parameter_t *parameter2 = func2->parameters; + for ( ; parameter1 != NULL && parameter2 != NULL; + parameter1 = parameter1->next, parameter2 = parameter2->next) { + type_t *parameter1_type = skip_typeref(parameter1->type); + type_t *parameter2_type = skip_typeref(parameter2->type); + + parameter1_type = get_unqualified_type(parameter1_type); + parameter2_type = get_unqualified_type(parameter2_type); + + if (!types_compatible(parameter1_type, parameter2_type)) + return false; + } + /* same number of arguments? */ + if (parameter1 != NULL || parameter2 != NULL) + return false; + + return true; +} + +/** + * Check if two array types are compatible. + */ +static bool array_types_compatible(const array_type_t *array1, + const array_type_t *array2) +{ + type_t *element_type1 = skip_typeref(array1->element_type); + type_t *element_type2 = skip_typeref(array2->element_type); + if (!types_compatible(element_type1, element_type2)) + return false; + + if (!array1->size_constant || !array2->size_constant) + return true; + + return array1->size == array2->size; +} + +bool types_compatible(const type_t *type1, const type_t *type2) +{ + assert(!is_typeref(type1)); + assert(!is_typeref(type2)); + + /* shortcut: the same type is always compatible */ + if (type1 == type2) + return true; + + if (type1->base.qualifiers == type2->base.qualifiers && + type1->kind == type2->kind) { + switch (type1->kind) { + case TYPE_FUNCTION: + return function_types_compatible(&type1->function, &type2->function); + case TYPE_ATOMIC: + case TYPE_IMAGINARY: + case TYPE_COMPLEX: + return type1->atomic.akind == type2->atomic.akind; + case TYPE_ARRAY: + return array_types_compatible(&type1->array, &type2->array); + + case TYPE_POINTER: { + const type_t *const to1 = skip_typeref(type1->pointer.points_to); + const type_t *const to2 = skip_typeref(type2->pointer.points_to); + return types_compatible(to1, to2); + } + + case TYPE_REFERENCE: { + const type_t *const to1 = skip_typeref(type1->reference.refers_to); + const type_t *const to2 = skip_typeref(type2->reference.refers_to); + return types_compatible(to1, to2); + } + + case TYPE_COMPOUND_STRUCT: + case TYPE_COMPOUND_UNION: + break; + + case TYPE_ENUM: + /* TODO: not implemented */ + break; + + case TYPE_ERROR: + /* Hmm, the error type should be compatible to all other types */ + return true; + case TYPE_TYPEDEF: + case TYPE_TYPEOF: + panic("typerefs not skipped in compatible types?!?"); + } + } + + return !is_type_valid(type1) || !is_type_valid(type2); +} + +/** + * Skip all typerefs and return the underlying type. + */ +type_t *skip_typeref(type_t *type) +{ + type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE; + + while (true) { + switch (type->kind) { + case TYPE_ERROR: + return type; + case TYPE_TYPEDEF: { + qualifiers |= type->base.qualifiers; + + const typedef_type_t *typedef_type = &type->typedeft; + if (typedef_type->resolved_type != NULL) { + type = typedef_type->resolved_type; + break; + } + type = typedef_type->typedefe->type; + continue; + } + case TYPE_TYPEOF: + qualifiers |= type->base.qualifiers; + type = type->typeoft.typeof_type; + continue; + default: + break; + } + break; + } + + if (qualifiers != TYPE_QUALIFIER_NONE) { + type_t *const copy = duplicate_type(type); + + /* for const with typedefed array type the element type has to be + * adjusted */ + if (is_type_array(copy)) { + type_t *element_type = copy->array.element_type; + element_type = duplicate_type(element_type); + element_type->base.qualifiers |= qualifiers; + copy->array.element_type = element_type; + } else { + copy->base.qualifiers |= qualifiers; + } + + type = identify_new_type(copy); + } + + return type; +} + +unsigned get_type_size(type_t *type) +{ + switch (type->kind) { + case TYPE_ERROR: return 0; + case TYPE_ATOMIC: + case TYPE_IMAGINARY: + case TYPE_ENUM: + return get_atomic_type_size(type->atomic.akind); + case TYPE_COMPLEX: + return get_atomic_type_size(type->atomic.akind) * 2; + case TYPE_COMPOUND_UNION: + layout_union_type(&type->compound); + return type->compound.compound->size; + case TYPE_COMPOUND_STRUCT: + layout_struct_type(&type->compound); + return type->compound.compound->size; + case TYPE_FUNCTION: + return 1; /* strange GNU extensions: sizeof(function) == 1 */ + case TYPE_REFERENCE: + case TYPE_POINTER: + return pointer_properties.size; + case TYPE_ARRAY: { + /* TODO: correct if element_type is aligned? */ + il_size_t element_size = get_type_size(type->array.element_type); + return type->array.size * element_size; + } + case TYPE_TYPEDEF: + return get_type_size(type->typedeft.typedefe->type); + case TYPE_TYPEOF: + return get_type_size(type->typeoft.typeof_type); + } + panic("invalid type in get_type_size"); +} - atomic_type_t *atomic_type = (atomic_type_t*) type; - switch(atomic_type->atype) { - case ATOMIC_TYPE_FLOAT: - case ATOMIC_TYPE_DOUBLE: - case ATOMIC_TYPE_LONG_DOUBLE: -#ifdef PROVIDE_COMPLEX - case ATOMIC_TYPE_FLOAT_COMPLEX: - case ATOMIC_TYPE_DOUBLE_COMPLEX: - case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX: -#endif -#ifdef PROVIDE_IMAGINARY - case ATOMIC_TYPE_FLOAT_IMAGINARY: - case ATOMIC_TYPE_DOUBLE_IMAGINARY: - case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY: -#endif +unsigned get_type_alignment(type_t *type) +{ + switch (type->kind) { + case TYPE_ERROR: + return 0; + case TYPE_ATOMIC: + case TYPE_IMAGINARY: + case TYPE_COMPLEX: + case TYPE_ENUM: + return get_atomic_type_alignment(type->atomic.akind); + case TYPE_COMPOUND_UNION: + layout_union_type(&type->compound); + return type->compound.compound->alignment; + case TYPE_COMPOUND_STRUCT: + layout_struct_type(&type->compound); + return type->compound.compound->alignment; + case TYPE_FUNCTION: + /* gcc says 1 here... */ return 1; - default: + case TYPE_REFERENCE: + case TYPE_POINTER: + return pointer_properties.alignment; + case TYPE_ARRAY: + return get_type_alignment(type->array.element_type); + case TYPE_TYPEDEF: { + il_alignment_t alignment + = get_type_alignment(type->typedeft.typedefe->type); + if (type->typedeft.typedefe->alignment > alignment) + alignment = type->typedeft.typedefe->alignment; + + return alignment; + } + case TYPE_TYPEOF: + return get_type_alignment(type->typeoft.typeof_type); + } + panic("invalid type in get_type_alignment"); +} + +/** + * get alignment of a type when used inside a compound. + * Some ABIs are broken and alignment inside a compound is different from + * recommended alignment of a type + */ +static unsigned get_type_alignment_compound(type_t *const type) +{ + assert(!is_typeref(type)); + if (type->kind == TYPE_ATOMIC) + return atomic_type_properties[type->atomic.akind].struct_alignment; + return get_type_alignment(type); +} + +decl_modifiers_t get_type_modifiers(const type_t *type) +{ + switch(type->kind) { + case TYPE_ERROR: + break; + case TYPE_COMPOUND_STRUCT: + case TYPE_COMPOUND_UNION: + return type->compound.compound->modifiers; + case TYPE_FUNCTION: + return type->function.modifiers; + case TYPE_ENUM: + case TYPE_ATOMIC: + case TYPE_COMPLEX: + case TYPE_IMAGINARY: + case TYPE_REFERENCE: + case TYPE_POINTER: + case TYPE_ARRAY: return 0; + case TYPE_TYPEDEF: { + decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers; + modifiers |= get_type_modifiers(type->typedeft.typedefe->type); + return modifiers; + } + case TYPE_TYPEOF: + return get_type_modifiers(type->typeoft.typeof_type); } + panic("invalid type found in get_type_modifiers"); } -bool is_type_arithmetic(const type_t *type) +type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type) { - if(is_type_integer(type) || is_type_floating(type)) - return 1; + type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE; - return 0; + while (true) { + switch (type->base.kind) { + case TYPE_ERROR: + return TYPE_QUALIFIER_NONE; + case TYPE_TYPEDEF: + qualifiers |= type->base.qualifiers; + const typedef_type_t *typedef_type = &type->typedeft; + if (typedef_type->resolved_type != NULL) + type = typedef_type->resolved_type; + else + type = typedef_type->typedefe->type; + continue; + case TYPE_TYPEOF: + type = type->typeoft.typeof_type; + continue; + case TYPE_ARRAY: + if (skip_array_type) { + type = type->array.element_type; + continue; + } + break; + default: + break; + } + break; + } + return type->base.qualifiers | qualifiers; } -bool is_type_scalar(const type_t *type) +unsigned get_atomic_type_size(atomic_type_kind_t kind) { - if(type->type == TYPE_POINTER) - return 1; + assert(kind <= ATOMIC_TYPE_LAST); + return atomic_type_properties[kind].size; +} - return is_type_arithmetic(type); +unsigned get_atomic_type_alignment(atomic_type_kind_t kind) +{ + assert(kind <= ATOMIC_TYPE_LAST); + return atomic_type_properties[kind].alignment; +} + +unsigned get_atomic_type_flags(atomic_type_kind_t kind) +{ + assert(kind <= ATOMIC_TYPE_LAST); + return atomic_type_properties[kind].flags; } -static type_t *identify_new_type(type_t *type) +/** + * Find the atomic type kind representing a given size (signed). + */ +atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) +{ + static atomic_type_kind_t kinds[32]; + + assert(size < 32); + atomic_type_kind_t kind = kinds[size]; + if (kind == ATOMIC_TYPE_INVALID) { + static const atomic_type_kind_t possible_kinds[] = { + ATOMIC_TYPE_SCHAR, + ATOMIC_TYPE_SHORT, + ATOMIC_TYPE_INT, + ATOMIC_TYPE_LONG, + ATOMIC_TYPE_LONGLONG + }; + for (size_t i = 0; i < lengthof(possible_kinds); ++i) { + if (get_atomic_type_size(possible_kinds[i]) == size) { + kind = possible_kinds[i]; + break; + } + } + kinds[size] = kind; + } + return kind; +} + +/** + * Find the atomic type kind representing a given size (signed). + */ +atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) +{ + static atomic_type_kind_t kinds[32]; + + assert(size < 32); + atomic_type_kind_t kind = kinds[size]; + if (kind == ATOMIC_TYPE_INVALID) { + static const atomic_type_kind_t possible_kinds[] = { + ATOMIC_TYPE_UCHAR, + ATOMIC_TYPE_USHORT, + ATOMIC_TYPE_UINT, + ATOMIC_TYPE_ULONG, + ATOMIC_TYPE_ULONGLONG + }; + for (size_t i = 0; i < lengthof(possible_kinds); ++i) { + if (get_atomic_type_size(possible_kinds[i]) == size) { + kind = possible_kinds[i]; + break; + } + } + kinds[size] = kind; + } + return kind; +} + +/** + * Hash the given type and return the "singleton" version + * of it. + */ +type_t *identify_new_type(type_t *type) { type_t *result = typehash_insert(type); - if(result != type) { - obstack_free(type_obst, type); + if (result != type) { + obstack_free(&type_obst, type); } return result; } -type_t *make_atomic_type(atomic_type_type_t type, type_qualifier_t qualifiers) +/** + * Creates a new atomic type. + * + * @param akind The kind of the atomic type. + * @param qualifiers Type qualifiers for the new type. + */ +type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers) +{ + type_t *const type = allocate_type_zero(TYPE_ATOMIC); + type->base.qualifiers = qualifiers; + type->atomic.akind = akind; + + return identify_new_type(type); +} + +/** + * Creates a new complex type. + * + * @param akind The kind of the atomic type. + * @param qualifiers Type qualifiers for the new type. + */ +type_t *make_complex_type(atomic_type_kind_t akind, + type_qualifiers_t qualifiers) { - atomic_type_t *atomic_type - = obstack_alloc(type_obst, sizeof(atomic_type[0])); - memset(atomic_type, 0, sizeof(atomic_type[0])); - atomic_type->type.type = TYPE_ATOMIC; - atomic_type->type.qualifiers = qualifiers; - atomic_type->atype = type; + type_t *const type = allocate_type_zero(TYPE_COMPLEX); + type->base.qualifiers = qualifiers; + type->atomic.akind = akind; - return identify_new_type((type_t*) atomic_type); + return identify_new_type(type); } -type_t *make_pointer_type(type_t *points_to, type_qualifier_t qualifiers) +/** + * Creates a new imaginary type. + * + * @param akind The kind of the atomic type. + * @param qualifiers Type qualifiers for the new type. + */ +type_t *make_imaginary_type(atomic_type_kind_t akind, + type_qualifiers_t qualifiers) { - pointer_type_t *pointer_type - = obstack_alloc(type_obst, sizeof(pointer_type[0])); - memset(pointer_type, 0, sizeof(pointer_type[0])); - pointer_type->type.type = TYPE_POINTER; - pointer_type->type.qualifiers = qualifiers; - pointer_type->points_to = points_to; + type_t *const type = allocate_type_zero(TYPE_IMAGINARY); + type->base.qualifiers = qualifiers; + type->atomic.akind = akind; + + return identify_new_type(type); +} + +/** + * Creates a new pointer type. + * + * @param points_to The points-to type for the new type. + * @param qualifiers Type qualifiers for the new type. + */ +type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers) +{ + type_t *const type = allocate_type_zero(TYPE_POINTER); + type->base.qualifiers = qualifiers; + type->pointer.points_to = points_to; + type->pointer.base_variable = NULL; + + return identify_new_type(type); +} + +/** + * Creates a new reference type. + * + * @param refers_to The referred-to type for the new type. + */ +type_t *make_reference_type(type_t *refers_to) +{ + type_t *const type = allocate_type_zero(TYPE_REFERENCE); + type->base.qualifiers = TYPE_QUALIFIER_NONE; + type->reference.refers_to = refers_to; + + return identify_new_type(type); +} + +/** + * Creates a new based pointer type. + * + * @param points_to The points-to type for the new type. + * @param qualifiers Type qualifiers for the new type. + * @param variable The based variable + */ +type_t *make_based_pointer_type(type_t *points_to, + type_qualifiers_t qualifiers, variable_t *variable) +{ + type_t *const type = allocate_type_zero(TYPE_POINTER); + type->base.qualifiers = qualifiers; + type->pointer.points_to = points_to; + type->pointer.base_variable = variable; + + return identify_new_type(type); +} + + +type_t *make_array_type(type_t *element_type, size_t size, + type_qualifiers_t qualifiers) +{ + type_t *const type = allocate_type_zero(TYPE_ARRAY); + type->base.qualifiers = qualifiers; + type->array.element_type = element_type; + type->array.size = size; + type->array.size_constant = true; + + return identify_new_type(type); +} + +static entity_t *pack_bitfield_members(il_size_t *struct_offset, + il_alignment_t *struct_alignment, + bool packed, entity_t *first) +{ + il_size_t offset = *struct_offset; + il_alignment_t alignment = *struct_alignment; + size_t bit_offset = 0; + + entity_t *member; + for (member = first; member != NULL; member = member->base.next) { + if (member->kind != ENTITY_COMPOUND_MEMBER) + continue; + if (!member->compound_member.bitfield) + break; + + type_t *const base_type = skip_typeref(member->declaration.type); + il_alignment_t base_alignment = get_type_alignment_compound(base_type); + il_alignment_t alignment_mask = base_alignment-1; + if (base_alignment > alignment) + alignment = base_alignment; + + size_t bit_size = member->compound_member.bit_size; + if (!packed) { + bit_offset += (offset & alignment_mask) * BITS_PER_BYTE; + offset &= ~alignment_mask; + size_t base_size = get_type_size(base_type) * BITS_PER_BYTE; + + if (bit_offset + bit_size > base_size || bit_size == 0) { + offset += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE; + offset = (offset + base_alignment-1) & ~alignment_mask; + bit_offset = 0; + } + } + + if (byte_order_big_endian) { + size_t base_size = get_type_size(base_type) * BITS_PER_BYTE; + member->compound_member.offset = offset & ~alignment_mask; + member->compound_member.bit_offset = base_size - bit_offset - bit_size; + } else { + member->compound_member.offset = offset; + member->compound_member.bit_offset = bit_offset; + } + + bit_offset += bit_size; + offset += bit_offset / BITS_PER_BYTE; + bit_offset %= BITS_PER_BYTE; + } + + if (bit_offset > 0) + offset += 1; + + *struct_offset = offset; + *struct_alignment = alignment; + return member; +} + +void layout_struct_type(compound_type_t *type) +{ + assert(type->compound != NULL); + + compound_t *compound = type->compound; + if (!compound->complete) + return; + if (type->compound->layouted) + return; + compound->layouted = true; + + il_size_t offset = 0; + il_alignment_t alignment = compound->alignment; + bool need_pad = false; + + entity_t *entry = compound->members.entities; + while (entry != NULL) { + if (entry->kind != ENTITY_COMPOUND_MEMBER) + goto next; + + type_t *const m_type = skip_typeref(entry->declaration.type); + if (!is_type_valid(m_type)) + goto next; + + if (entry->compound_member.bitfield) { + entry = pack_bitfield_members(&offset, &alignment, + compound->packed, entry); + continue; + } + + il_alignment_t m_alignment = get_type_alignment_compound(m_type); + if (m_alignment > alignment) + alignment = m_alignment; + + if (!compound->packed) { + il_size_t new_offset = (offset + m_alignment-1) & -m_alignment; + + if (new_offset > offset) { + need_pad = true; + offset = new_offset; + } + } + + entry->compound_member.offset = offset; + offset += get_type_size(m_type); + +next: + entry = entry->base.next; + } + + if (!compound->packed) { + il_size_t new_offset = (offset + alignment-1) & -alignment; + if (new_offset > offset) { + need_pad = true; + offset = new_offset; + } + } + + source_position_t const *const pos = &compound->base.source_position; + if (need_pad) { + warningf(WARN_PADDED, pos, "'%T' needs padding", type); + } else if (compound->packed) { + warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type); + } + + compound->size = offset; + compound->alignment = alignment; +} + +void layout_union_type(compound_type_t *type) +{ + assert(type->compound != NULL); + + compound_t *compound = type->compound; + if (! compound->complete) + return; + if (compound->layouted) + return; + compound->layouted = true; + + il_size_t size = 0; + il_alignment_t alignment = compound->alignment; + + entity_t *entry = compound->members.entities; + for (; entry != NULL; entry = entry->base.next) { + if (entry->kind != ENTITY_COMPOUND_MEMBER) + continue; + + type_t *m_type = skip_typeref(entry->declaration.type); + if (! is_type_valid(skip_typeref(m_type))) + continue; + + entry->compound_member.offset = 0; + il_size_t m_size = get_type_size(m_type); + if (m_size > size) + size = m_size; + il_alignment_t m_alignment = get_type_alignment_compound(m_type); + if (m_alignment > alignment) + alignment = m_alignment; + } + size = (size + alignment - 1) & -alignment; + + compound->size = size; + compound->alignment = alignment; +} + +function_parameter_t *allocate_parameter(type_t *const type) +{ + function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param)); + memset(param, 0, sizeof(*param)); + param->type = type; + return param; +} + +type_t *make_function_2_type(type_t *return_type, type_t *argument_type1, + type_t *argument_type2, decl_modifiers_t modifiers) +{ + function_parameter_t *const parameter2 = allocate_parameter(argument_type2); + function_parameter_t *const parameter1 = allocate_parameter(argument_type1); + parameter1->next = parameter2; + + type_t *type = allocate_type_zero(TYPE_FUNCTION); + type->function.return_type = return_type; + type->function.parameters = parameter1; + type->function.modifiers |= modifiers; + type->function.linkage = LINKAGE_C; + + return identify_new_type(type); +} + +type_t *make_function_1_type(type_t *return_type, type_t *argument_type, + decl_modifiers_t modifiers) +{ + function_parameter_t *const parameter = allocate_parameter(argument_type); + + type_t *type = allocate_type_zero(TYPE_FUNCTION); + type->function.return_type = return_type; + type->function.parameters = parameter; + type->function.modifiers |= modifiers; + type->function.linkage = LINKAGE_C; + + return identify_new_type(type); +} + +type_t *make_function_1_type_variadic(type_t *return_type, + type_t *argument_type, + decl_modifiers_t modifiers) +{ + function_parameter_t *const parameter = allocate_parameter(argument_type); + + type_t *type = allocate_type_zero(TYPE_FUNCTION); + type->function.return_type = return_type; + type->function.parameters = parameter; + type->function.variadic = true; + type->function.modifiers |= modifiers; + type->function.linkage = LINKAGE_C; + + return identify_new_type(type); +} + +type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers) +{ + type_t *type = allocate_type_zero(TYPE_FUNCTION); + type->function.return_type = return_type; + type->function.parameters = NULL; + type->function.modifiers |= modifiers; + type->function.linkage = LINKAGE_C; + + return identify_new_type(type); +} + +type_t *make_function_type(type_t *return_type, int n_types, + type_t *const *argument_types, + decl_modifiers_t modifiers) +{ + type_t *type = allocate_type_zero(TYPE_FUNCTION); + type->function.return_type = return_type; + type->function.modifiers |= modifiers; + type->function.linkage = LINKAGE_C; + + function_parameter_t **anchor = &type->function.parameters; + for (int i = 0; i < n_types; ++i) { + function_parameter_t *parameter = allocate_parameter(argument_types[i]); + *anchor = parameter; + anchor = ¶meter->next; + } - return identify_new_type((type_t*) pointer_type); + return identify_new_type(type); } +/** + * Debug helper. Prints the given type to stdout. + */ static __attribute__((unused)) -void dbg_type(type_t *type) +void dbg_type(const type_t *type) { - FILE *old_out = out; - out = stderr; + print_to_file(stderr); print_type(type); - puts("\n"); + print_char('\n'); fflush(stderr); - out = old_out; }