blob: 31ecef0f554d87df25f7fa56fb8da269ebdc49e3 [file] [log] [blame]
/*
* Stupid C parser, version 1e-6.
*
* Let's see how hard this is to do.
*
* Copyright (C) 2003 Transmeta Corp.
* 2003-2004 Linus Torvalds
* Copyright (C) 2004 Christopher Li
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include "lib.h"
#include "allocate.h"
#include "token.h"
#include "parse.h"
#include "symbol.h"
#include "scope.h"
#include "expression.h"
#include "target.h"
static struct symbol_list **function_symbol_list;
struct symbol_list *function_computed_target_list;
struct statement_list *function_computed_goto_list;
static struct token *statement(struct token *token, struct statement **tree);
static struct token *handle_attributes(struct token *token, struct decl_state *ctx);
typedef struct token *declarator_t(struct token *, struct symbol *, struct decl_state *);
static declarator_t
struct_specifier, union_specifier, enum_specifier,
attribute_specifier, typeof_specifier,
storage_specifier, thread_specifier;
static declarator_t generic_qualifier;
static declarator_t autotype_specifier;
static struct token *parse_if_statement(struct token *token, struct statement *stmt);
static struct token *parse_return_statement(struct token *token, struct statement *stmt);
static struct token *parse_loop_iterator(struct token *token, struct statement *stmt);
static struct token *parse_default_statement(struct token *token, struct statement *stmt);
static struct token *parse_case_statement(struct token *token, struct statement *stmt);
static struct token *parse_switch_statement(struct token *token, struct statement *stmt);
static struct token *parse_for_statement(struct token *token, struct statement *stmt);
static struct token *parse_while_statement(struct token *token, struct statement *stmt);
static struct token *parse_do_statement(struct token *token, struct statement *stmt);
static struct token *parse_goto_statement(struct token *token, struct statement *stmt);
static struct token *parse_context_statement(struct token *token, struct statement *stmt);
static struct token *parse_range_statement(struct token *token, struct statement *stmt);
static struct token *parse_asm_statement(struct token *token, struct statement *stmt);
static struct token *toplevel_asm_declaration(struct token *token, struct symbol_list **list);
static struct token *parse_static_assert(struct token *token, struct symbol_list **unused);
typedef struct token *attr_t(struct token *, struct symbol *,
struct decl_state *);
static attr_t
attribute_packed, attribute_aligned, attribute_modifier,
attribute_function,
attribute_bitwise,
attribute_address_space, attribute_context,
attribute_designated_init,
attribute_transparent_union, ignore_attribute,
attribute_mode, attribute_force;
typedef struct symbol *to_mode_t(struct symbol *);
static to_mode_t
to_QI_mode, to_HI_mode, to_SI_mode, to_DI_mode, to_TI_mode;
static to_mode_t to_pointer_mode, to_word_mode;
enum {
Set_T = 1,
Set_S = 2,
Set_Char = 4,
Set_Int = 8,
Set_Double = 16,
Set_Float = 32,
Set_Signed = 64,
Set_Unsigned = 128,
Set_Short = 256,
Set_Long = 512,
Set_Vlong = 1024,
Set_Int128 = 2048,
Set_Any = Set_T | Set_Short | Set_Long | Set_Signed | Set_Unsigned
};
enum {
CInt = 0, CSInt, CUInt, CReal,
};
static void asm_modifier(struct token *token, unsigned long *mods, unsigned long mod)
{
if (*mods & mod)
warning(token->pos, "duplicated asm modifier");
*mods |= mod;
}
static struct symbol_op typedef_op = {
.type = KW_MODIFIER,
.declarator = storage_specifier,
};
static struct symbol_op inline_op = {
.type = KW_MODIFIER,
.declarator = generic_qualifier,
.asm_modifier = asm_modifier,
};
static struct symbol_op noreturn_op = {
.type = KW_MODIFIER,
.declarator = generic_qualifier,
};
static declarator_t alignas_specifier;
static struct symbol_op alignas_op = {
.type = KW_MODIFIER,
.declarator = alignas_specifier,
};
static struct symbol_op auto_op = {
.type = KW_MODIFIER,
.declarator = storage_specifier,
};
static struct symbol_op register_op = {
.type = KW_MODIFIER,
.declarator = storage_specifier,
};
static struct symbol_op static_op = {
.type = KW_MODIFIER|KW_STATIC,
.declarator = storage_specifier,
};
static struct symbol_op extern_op = {
.type = KW_MODIFIER,
.declarator = storage_specifier,
};
static struct symbol_op thread_op = {
.type = KW_MODIFIER,
.declarator = thread_specifier,
};
static struct symbol_op const_op = {
.type = KW_QUALIFIER,
.declarator = generic_qualifier,
};
static struct symbol_op volatile_op = {
.type = KW_QUALIFIER,
.declarator = generic_qualifier,
.asm_modifier = asm_modifier,
};
static struct symbol_op restrict_op = {
.type = KW_QUALIFIER,
.declarator = generic_qualifier,
};
static struct symbol_op atomic_op = {
.type = KW_QUALIFIER,
.declarator = generic_qualifier,
};
static struct symbol_op typeof_op = {
.type = KW_SPECIFIER,
.declarator = typeof_specifier,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op autotype_op = {
.type = KW_SPECIFIER,
.declarator = autotype_specifier,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op attribute_op = {
.type = KW_ATTRIBUTE,
.declarator = attribute_specifier,
};
static struct symbol_op struct_op = {
.type = KW_SPECIFIER,
.declarator = struct_specifier,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op union_op = {
.type = KW_SPECIFIER,
.declarator = union_specifier,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op enum_op = {
.type = KW_SPECIFIER,
.declarator = enum_specifier,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op spec_op = {
.type = KW_SPECIFIER | KW_EXACT,
.test = Set_Any,
.set = Set_S|Set_T,
};
static struct symbol_op char_op = {
.type = KW_SPECIFIER,
.test = Set_T|Set_Long|Set_Short,
.set = Set_T|Set_Char,
.class = CInt,
};
static struct symbol_op int_op = {
.type = KW_SPECIFIER,
.test = Set_T,
.set = Set_T|Set_Int,
};
static struct symbol_op double_op = {
.type = KW_SPECIFIER,
.test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Vlong,
.set = Set_T|Set_Double,
.class = CReal,
};
static struct symbol_op float_op = {
.type = KW_SPECIFIER,
.test = Set_T|Set_Signed|Set_Unsigned|Set_Short|Set_Long,
.set = Set_T|Set_Float,
.class = CReal,
};
static struct symbol_op short_op = {
.type = KW_SPECIFIER,
.test = Set_S|Set_Char|Set_Float|Set_Double|Set_Long|Set_Short,
.set = Set_Short,
};
static struct symbol_op signed_op = {
.type = KW_SPECIFIER,
.test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
.set = Set_Signed,
.class = CSInt,
};
static struct symbol_op unsigned_op = {
.type = KW_SPECIFIER,
.test = Set_S|Set_Float|Set_Double|Set_Signed|Set_Unsigned,
.set = Set_Unsigned,
.class = CUInt,
};
static struct symbol_op long_op = {
.type = KW_SPECIFIER,
.test = Set_S|Set_Char|Set_Float|Set_Short|Set_Vlong,
.set = Set_Long,
};
static struct symbol_op int128_op = {
.type = KW_SPECIFIER,
.test = Set_S|Set_T|Set_Char|Set_Short|Set_Int|Set_Float|Set_Double|Set_Long|Set_Vlong|Set_Int128,
.set = Set_T|Set_Int128|Set_Vlong,
.class = CInt,
};
static struct symbol_op if_op = {
.statement = parse_if_statement,
};
static struct symbol_op return_op = {
.statement = parse_return_statement,
};
static struct symbol_op loop_iter_op = {
.statement = parse_loop_iterator,
};
static struct symbol_op default_op = {
.statement = parse_default_statement,
};
static struct symbol_op case_op = {
.statement = parse_case_statement,
};
static struct symbol_op switch_op = {
.statement = parse_switch_statement,
};
static struct symbol_op for_op = {
.statement = parse_for_statement,
};
static struct symbol_op while_op = {
.statement = parse_while_statement,
};
static struct symbol_op do_op = {
.statement = parse_do_statement,
};
static struct symbol_op goto_op = {
.statement = parse_goto_statement,
};
static struct symbol_op __context___op = {
.statement = parse_context_statement,
.attribute = attribute_context,
};
static struct symbol_op range_op = {
.statement = parse_range_statement,
};
static struct symbol_op asm_op = {
.type = KW_ASM,
.statement = parse_asm_statement,
.toplevel = toplevel_asm_declaration,
};
static struct symbol_op static_assert_op = {
.toplevel = parse_static_assert,
};
static struct symbol_op packed_op = {
.attribute = attribute_packed,
};
static struct symbol_op aligned_op = {
.attribute = attribute_aligned,
};
static struct symbol_op attr_mod_op = {
.attribute = attribute_modifier,
};
static struct symbol_op attr_fun_op = {
.attribute = attribute_function,
};
static struct symbol_op attr_bitwise_op = {
.attribute = attribute_bitwise,
};
static struct symbol_op attr_force_op = {
.attribute = attribute_force,
};
static struct symbol_op address_space_op = {
.attribute = attribute_address_space,
};
static struct symbol_op mode_op = {
.attribute = attribute_mode,
};
static struct symbol_op context_op = {
.attribute = attribute_context,
};
static struct symbol_op designated_init_op = {
.attribute = attribute_designated_init,
};
static struct symbol_op transparent_union_op = {
.attribute = attribute_transparent_union,
};
static struct symbol_op ignore_attr_op = {
.attribute = ignore_attribute,
};
static struct symbol_op mode_QI_op = {
.type = KW_MODE,
.to_mode = to_QI_mode
};
static struct symbol_op mode_HI_op = {
.type = KW_MODE,
.to_mode = to_HI_mode
};
static struct symbol_op mode_SI_op = {
.type = KW_MODE,
.to_mode = to_SI_mode
};
static struct symbol_op mode_DI_op = {
.type = KW_MODE,
.to_mode = to_DI_mode
};
static struct symbol_op mode_TI_op = {
.type = KW_MODE,
.to_mode = to_TI_mode
};
static struct symbol_op mode_pointer_op = {
.type = KW_MODE,
.to_mode = to_pointer_mode
};
static struct symbol_op mode_word_op = {
.type = KW_MODE,
.to_mode = to_word_mode
};
/*
* Define the keyword and their effects.
* The entries in the 'typedef' and put in NS_TYPEDEF and
* are automatically set as reserved keyword while the ones
* in the 'keyword' table are just put in NS_KEYWORD.
*
* The entries are added via the 3 macros:
* N() for entries with "name" only,
* D() for entries with "name" & "__name__",
* A() for entries with "name", "__name" & "__name__",
* U() for entries with "__name" & "__name__".
*/
static struct init_keyword {
const char *name;
struct symbol_op *op;
struct symbol *type;
unsigned long mods;
} typedefs[] = {
#define N(I, O,...) { I, O,##__VA_ARGS__ }
#define D(I, O,...) N(I,O,##__VA_ARGS__ ), \
N("__" I "__",O,##__VA_ARGS__)
#define A(I, O,...) N(I,O,##__VA_ARGS__ ), \
N("__" I,O,##__VA_ARGS__), \
N("__" I "__",O,##__VA_ARGS__)
#define U(I, O,...) N("__" I,O,##__VA_ARGS__), \
N("__" I "__",O,##__VA_ARGS__)
/* Storage classes */
N("auto", &auto_op, .mods = MOD_AUTO),
N("register", &register_op, .mods = MOD_REGISTER),
N("static", &static_op, .mods = MOD_STATIC),
N("extern", &extern_op, .mods = MOD_EXTERN),
N("__thread", &thread_op),
N("_Thread_local", &thread_op),
A("inline", &inline_op, .mods = MOD_INLINE),
/* Typedef ... */
N("typedef", &typedef_op, .mods = MOD_USERTYPE),
A("typeof", &typeof_op),
N("__auto_type", &autotype_op),
/* Type qualifiers */
A("const", &const_op, .mods = MOD_CONST),
A("volatile", &volatile_op, .mods = MOD_VOLATILE),
A("restrict", &restrict_op, .mods = MOD_RESTRICT),
N("_Atomic", &atomic_op, .mods = MOD_ATOMIC),
N("_Noreturn", &noreturn_op, .mods = MOD_NORETURN),
N("_Alignas", &alignas_op),
U("attribute", &attribute_op),
/* Type specifiers */
N("struct", &struct_op),
N("union", &union_op),
N("enum", &enum_op),
N("void", &spec_op, .type = &void_ctype),
N("char", &char_op),
N("short", &short_op),
N("int", &int_op),
N("long", &long_op),
N("float", &float_op),
N("double", &double_op),
A("signed", &signed_op),
N("unsigned", &unsigned_op),
N("__int128", &int128_op),
N("_Bool", &spec_op, .type = &bool_ctype),
/* Predeclared types */
N("__builtin_va_list", &spec_op, .type = &ptr_ctype),
N("__builtin_ms_va_list",&spec_op, .type = &ptr_ctype),
N("__int128_t", &spec_op, .type = &sint128_ctype),
N("__uint128_t", &spec_op, .type = &uint128_ctype),
N("_Float32", &spec_op, .type = &float32_ctype),
N("_Float32x", &spec_op, .type = &float32x_ctype),
N("_Float64", &spec_op, .type = &float64_ctype),
N("_Float64x", &spec_op, .type = &float64x_ctype),
N("_Float128", &spec_op, .type = &float128_ctype),
}, keywords[] = {
/* Statements */
N("if", &if_op),
N("return", &return_op),
N("break", &loop_iter_op),
N("continue", &loop_iter_op),
N("default", &default_op),
N("case", &case_op),
N("switch", &switch_op),
N("for", &for_op),
N("while", &while_op),
N("do", &do_op),
N("goto", &goto_op),
A("asm", &asm_op),
N("context", &context_op),
N("__context__", &__context___op),
N("__range__", &range_op),
N("_Static_assert", &static_assert_op),
/* Attributes */
D("packed", &packed_op),
D("aligned", &aligned_op),
D("nocast", &attr_mod_op, .mods = MOD_NOCAST),
D("noderef", &attr_mod_op, .mods = MOD_NODEREF),
D("safe", &attr_mod_op, .mods = MOD_SAFE),
D("unused", &attr_mod_op, .mods = MOD_UNUSED),
D("externally_visible", &attr_mod_op, .mods = MOD_EXT_VISIBLE),
D("force", &attr_force_op),
D("bitwise", &attr_bitwise_op, .mods = MOD_BITWISE),
D("address_space", &address_space_op),
D("designated_init", &designated_init_op),
D("transparent_union", &transparent_union_op),
D("noreturn", &attr_fun_op, .mods = MOD_NORETURN),
D("pure", &attr_fun_op, .mods = MOD_PURE),
A("const", &attr_fun_op, .mods = MOD_PURE),
D("gnu_inline", &attr_fun_op, .mods = MOD_GNU_INLINE),
/* Modes */
D("mode", &mode_op),
D("QI", &mode_QI_op),
D("HI", &mode_HI_op),
D("SI", &mode_SI_op),
D("DI", &mode_DI_op),
D("TI", &mode_TI_op),
D("byte", &mode_QI_op),
D("pointer", &mode_pointer_op),
D("word", &mode_word_op),
};
static const char *ignored_attributes[] = {
#define GCC_ATTR(x) \
STRINGIFY(x), \
STRINGIFY(__##x##__),
#include "gcc-attr-list.h"
#undef GCC_ATTR
"bounded",
"__bounded__",
"__noclone",
"__nonnull",
"__nothrow",
};
static void init_keyword(int stream, struct init_keyword *kw, enum namespace ns)
{
struct symbol *sym = create_symbol(stream, kw->name, SYM_KEYWORD, ns);
sym->ident->keyword = 1;
sym->ident->reserved |= (ns == NS_TYPEDEF);
sym->ctype.modifiers = kw->mods;
sym->ctype.base_type = kw->type;
sym->op = kw->op;
}
void init_parser(int stream)
{
int i;
for (i = 0; i < ARRAY_SIZE(typedefs); i++)
init_keyword(stream, &typedefs[i], NS_TYPEDEF);
for (i = 0; i < ARRAY_SIZE(keywords); i++)
init_keyword(stream, &keywords[i], NS_KEYWORD);
for (i = 0; i < ARRAY_SIZE(ignored_attributes); i++) {
const char * name = ignored_attributes[i];
struct symbol *sym = create_symbol(stream, name, SYM_KEYWORD,
NS_KEYWORD);
if (!sym->op) {
sym->ident->keyword = 1;
sym->op = &ignore_attr_op;
}
}
}
static struct token *skip_to(struct token *token, int op)
{
while (!match_op(token, op) && !eof_token(token))
token = token->next;
return token;
}
static struct token bad_token = { .pos.type = TOKEN_BAD };
struct token *expect(struct token *token, int op, const char *where)
{
if (!match_op(token, op)) {
if (token != &bad_token) {
bad_token.next = token;
sparse_error(token->pos, "Expected %s %s", show_special(op), where);
sparse_error(token->pos, "got %s", show_token(token));
}
if (op == ';')
return skip_to(token, op);
return &bad_token;
}
return token->next;
}
///
// issue an error message on new parsing errors
// @token: the current token
// @errmsg: the error message
// If the current token is from a previous error, an error message
// has already been issued, so nothing more is done.
// Otherwise, @errmsg is displayed followed by the current token.
static void unexpected(struct token *token, const char *errmsg)
{
if (token == &bad_token)
return;
sparse_error(token->pos, "%s", errmsg);
sparse_error(token->pos, "got %s", show_token(token));
}
// Add a symbol to the list of function-local symbols
static void fn_local_symbol(struct symbol *sym)
{
if (function_symbol_list)
add_symbol(function_symbol_list, sym);
}
struct statement *alloc_statement(struct position pos, int type)
{
struct statement *stmt = __alloc_statement(0);
stmt->type = type;
stmt->pos = pos;
return stmt;
}
static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
static void apply_modifiers(struct position pos, struct decl_state *ctx)
{
struct symbol *ctype;
if (!ctx->mode)
return;
ctype = ctx->mode->to_mode(ctx->ctype.base_type);
if (!ctype)
sparse_error(pos, "don't know how to apply mode to %s",
show_typename(ctx->ctype.base_type));
else
ctx->ctype.base_type = ctype;
}
static struct symbol * alloc_indirect_symbol(struct position pos, struct ctype *ctype, int type)
{
struct symbol *sym = alloc_symbol(pos, type);
sym->ctype.base_type = ctype->base_type;
sym->ctype.modifiers = ctype->modifiers;
ctype->base_type = sym;
ctype->modifiers = 0;
return sym;
}
/*
* NOTE! NS_LABEL is not just a different namespace,
* it also ends up using function scope instead of the
* regular symbol scope.
*/
struct symbol *label_symbol(struct token *token, int used)
{
struct symbol *sym = lookup_symbol(token->ident, NS_LABEL);
if (!sym) {
sym = alloc_symbol(token->pos, SYM_LABEL);
bind_symbol(sym, token->ident, NS_LABEL);
if (used)
sym->used = 1;
fn_local_symbol(sym);
}
return sym;
}
static struct token *struct_union_enum_specifier(enum type type,
struct token *token, struct decl_state *ctx,
struct token *(*parse)(struct token *, struct symbol *))
{
struct symbol *sym;
struct position *repos;
token = handle_attributes(token, ctx);
if (token_type(token) == TOKEN_IDENT) {
sym = lookup_symbol(token->ident, NS_STRUCT);
if (!sym ||
(is_outer_scope(sym->scope) &&
(match_op(token->next,';') || match_op(token->next,'{')))) {
// Either a new symbol, or else an out-of-scope
// symbol being redefined.
sym = alloc_symbol(token->pos, type);
bind_symbol(sym, token->ident, NS_STRUCT);
}
if (sym->type != type)
error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
ctx->ctype.base_type = sym;
repos = &token->pos;
token = token->next;
if (match_op(token, '{')) {
// The following test is actually wrong for empty
// structs, but (1) they are not C99, (2) gcc does
// the same thing, and (3) it's easier.
if (sym->symbol_list)
error_die(token->pos, "redefinition of %s", show_typename (sym));
sym->pos = *repos;
token = parse(token->next, sym);
token = expect(token, '}', "at end of struct-union-enum-specifier");
// Mark the structure as needing re-examination
sym->examined = 0;
sym->endpos = token->pos;
}
return token;
}
// private struct/union/enum type
if (!match_op(token, '{')) {
sparse_error(token->pos, "expected declaration");
ctx->ctype.base_type = &bad_ctype;
return token;
}
sym = alloc_symbol(token->pos, type);
set_current_scope(sym); // used by dissect
token = parse(token->next, sym);
ctx->ctype.base_type = sym;
token = expect(token, '}', "at end of specifier");
sym->endpos = token->pos;
return token;
}
static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
{
struct symbol *field, *last = NULL;
struct token *res;
res = struct_declaration_list(token, &sym->symbol_list);
FOR_EACH_PTR(sym->symbol_list, field) {
if (!field->ident) {
struct symbol *base = field->ctype.base_type;
if (base && base->type == SYM_BITFIELD)
continue;
}
if (last)
last->next_subobject = field;
last = field;
} END_FOR_EACH_PTR(field);
return res;
}
static struct token *parse_union_declaration(struct token *token, struct symbol *sym)
{
return struct_declaration_list(token, &sym->symbol_list);
}
static struct token *struct_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
return struct_union_enum_specifier(SYM_STRUCT, token, ctx, parse_struct_declaration);
}
static struct token *union_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
return struct_union_enum_specifier(SYM_UNION, token, ctx, parse_union_declaration);
}
///
// safe right shift
//
// This allow to use a shift amount as big (or bigger)
// than the width of the value to be shifted, in which case
// the result is, of course, 0.
static unsigned long long rshift(unsigned long long val, unsigned int n)
{
if (n >= (sizeof(val) * 8))
return 0;
return val >> n;
}
struct range {
long long neg;
unsigned long long pos;
};
static void update_range(struct range *range, unsigned long long uval, struct symbol *vtype)
{
long long sval = uval;
if (is_signed_type(vtype) && (sval < 0)) {
if (sval < range->neg)
range->neg = sval;
} else {
if (uval > range->pos)
range->pos = uval;
}
}
static int type_is_ok(struct symbol *type, struct range range)
{
int shift = type->bit_size;
int is_unsigned = type->ctype.modifiers & MOD_UNSIGNED;
if (!is_unsigned)
shift--;
if (rshift(range.pos, shift))
return 0;
if (range.neg == 0)
return 1;
if (is_unsigned)
return 0;
if (rshift(~range.neg, shift))
return 0;
return 1;
}
static struct range type_range(struct symbol *type)
{
struct range range;
unsigned int size = type->bit_size;
unsigned long long max;
long long min;
if (is_signed_type(type)) {
min = sign_bit(size);
max = min - 1;
} else {
min = 0;
max = bits_mask(size);
}
range.pos = max;
range.neg = min;
return range;
}
static int val_in_range(struct range *range, long long sval, struct symbol *vtype)
{
unsigned long long uval = sval;
if (is_signed_type(vtype) && (sval < 0))
return range->neg <= sval;
else
return uval <= range->pos;
}
static void cast_enum_list(struct symbol_list *list, struct symbol *base_type)
{
struct range irange = type_range(&int_ctype);
struct symbol *sym;
FOR_EACH_PTR(list, sym) {
struct expression *expr = sym->initializer;
struct symbol *ctype;
long long val;
if (expr->type != EXPR_VALUE)
continue;
ctype = expr->ctype;
val = get_expression_value(expr);
if (is_int_type(ctype) && val_in_range(&irange, val, ctype)) {
expr->ctype = &int_ctype;
continue;
}
cast_value(expr, base_type, expr, ctype);
expr->ctype = base_type;
} END_FOR_EACH_PTR(sym);
}
static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
{
unsigned long long lastval = 0;
struct symbol *ctype = NULL, *base_type = NULL;
struct range range = { };
int mix_bitwise = 0;
parent->examined = 1;
parent->ctype.base_type = &int_ctype;
while (token_type(token) == TOKEN_IDENT) {
struct expression *expr = NULL;
struct token *next = token->next;
struct decl_state ctx = { };
struct symbol *sym;
// FIXME: only 'deprecated' should be accepted
next = handle_attributes(next, &ctx);
if (match_op(next, '=')) {
next = constant_expression(next->next, &expr);
lastval = get_expression_value(expr);
ctype = &void_ctype;
if (expr && expr->ctype)
ctype = expr->ctype;
} else if (!ctype) {
ctype = &int_ctype;
} else if (is_int_type(ctype)) {
lastval++;
} else {
error_die(token->pos, "can't increment the last enum member");
}
if (!expr) {
expr = alloc_expression(token->pos, EXPR_VALUE);
expr->value = lastval;
expr->ctype = ctype;
}
sym = alloc_symbol(token->pos, SYM_NODE);
bind_symbol(sym, token->ident, NS_SYMBOL);
sym->ctype.modifiers &= ~MOD_ADDRESSABLE;
sym->initializer = expr;
sym->enum_member = 1;
sym->ctype.base_type = parent;
add_ptr_list(&parent->symbol_list, sym);
if (base_type != &bad_ctype) {
if (ctype->type == SYM_NODE)
ctype = ctype->ctype.base_type;
if (ctype->type == SYM_ENUM) {
if (ctype == parent)
ctype = base_type;
else
ctype = ctype->ctype.base_type;
}
/*
* base_type rules:
* - if all enums are of the same type, then
* the base_type is that type (two first
* cases)
* - if enums are of different types, they
* all have to be integer types, and the
* base type is at least "int_ctype".
* - otherwise the base_type is "bad_ctype".
*/
if (!base_type || ctype == &bad_ctype) {
base_type = ctype;
} else if (ctype == base_type) {
/* nothing */
} else if (is_int_type(base_type) && is_int_type(ctype)) {
base_type = &int_ctype;
} else if (is_restricted_type(base_type) != is_restricted_type(ctype)) {
if (!mix_bitwise++) {
warning(expr->pos, "mixed bitwiseness");
}
} else if (is_restricted_type(base_type) && base_type != ctype) {
sparse_error(expr->pos, "incompatible restricted type");
info(expr->pos, " expected: %s", show_typename(base_type));
info(expr->pos, " got: %s", show_typename(ctype));
base_type = &bad_ctype;
} else if (base_type != &bad_ctype) {
sparse_error(token->pos, "bad enum definition");
base_type = &bad_ctype;
}
parent->ctype.base_type = base_type;
}
if (is_int_type(base_type)) {
update_range(&range, lastval, ctype);
}
token = next;
sym->endpos = token->pos;
if (!match_op(token, ','))
break;
token = token->next;
}
if (!base_type) {
sparse_error(token->pos, "empty enum definition");
base_type = &bad_ctype;
}
else if (!is_int_type(base_type))
;
else if (type_is_ok(&uint_ctype, range))
base_type = &uint_ctype;
else if (type_is_ok(&int_ctype, range))
base_type = &int_ctype;
else if (type_is_ok(&ulong_ctype, range))
base_type = &ulong_ctype;
else if (type_is_ok(&long_ctype, range))
base_type = &long_ctype;
else if (type_is_ok(&ullong_ctype, range))
base_type = &ullong_ctype;
else if (type_is_ok(&llong_ctype, range))
base_type = &llong_ctype;
else
base_type = &bad_ctype;
parent->ctype.base_type = base_type;
parent->ctype.modifiers |= (base_type->ctype.modifiers & MOD_UNSIGNED);
parent->examined = 0;
if (mix_bitwise)
return token;
cast_enum_list(parent->symbol_list, base_type);
return token;
}
static struct token *enum_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
struct token *ret = struct_union_enum_specifier(SYM_ENUM, token, ctx, parse_enum_declaration);
struct ctype *ctype = &ctx->ctype.base_type->ctype;
if (!ctype->base_type)
ctype->base_type = &incomplete_ctype;
return ret;
}
static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype);
static struct token *typeof_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
if (!match_op(token, '(')) {
sparse_error(token->pos, "expected '(' after typeof");
return token;
}
if (lookup_type(token->next)) {
struct symbol *sym;
token = typename(token->next, &sym, NULL);
ctx->ctype.base_type = sym->ctype.base_type;
apply_ctype(token->pos, &sym->ctype, &ctx->ctype);
} else {
struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
token = parse_expression(token->next, &typeof_sym->initializer);
typeof_sym->endpos = token->pos;
if (!typeof_sym->initializer) {
sparse_error(token->pos, "expected expression after the '(' token");
typeof_sym = &bad_ctype;
}
ctx->ctype.base_type = typeof_sym;
}
return expect(token, ')', "after typeof");
}
static struct token *autotype_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
ctx->ctype.base_type = &autotype_ctype;
ctx->autotype = 1;
return token;
}
static struct token *ignore_attribute(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
struct expression *expr = NULL;
if (match_op(token, '('))
token = parens_expression(token, &expr, "in attribute");
return token;
}
static struct token *attribute_packed(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
if (!ctx->ctype.alignment)
ctx->ctype.alignment = 1;
return token;
}
static struct token *attribute_aligned(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
int alignment = max_alignment;
struct expression *expr = NULL;
if (match_op(token, '(')) {
token = parens_expression(token, &expr, "in attribute");
if (expr)
alignment = const_expression_value(expr);
}
if (alignment & (alignment-1)) {
warning(token->pos, "I don't like non-power-of-2 alignments");
return token;
} else if (alignment > ctx->ctype.alignment)
ctx->ctype.alignment = alignment;
return token;
}
static void apply_mod(struct position *pos, unsigned long *mods, unsigned long mod)
{
if (*mods & mod & ~MOD_DUP_OK)
warning(*pos, "duplicate %s", modifier_name(mod));
*mods |= mod;
}
static void apply_qualifier(struct position *pos, struct ctype *ctx, unsigned long qual)
{
apply_mod(pos, &ctx->modifiers, qual);
}
static struct token *attribute_modifier(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
apply_mod(&token->pos, &ctx->ctype.modifiers, attr->ctype.modifiers);
return token;
}
static struct token *attribute_function(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
apply_mod(&token->pos, &ctx->f_modifiers, attr->ctype.modifiers);
return token;
}
static struct token *attribute_bitwise(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
if (Wbitwise)
attribute_modifier(token, attr, ctx);
return token;
}
static struct ident *numerical_address_space(int asn)
{
char buff[32];
if (!asn)
return NULL;
sprintf(buff, "<asn:%d>", asn);
return built_in_ident(buff);
}
static struct token *attribute_address_space(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
struct expression *expr = NULL;
struct ident *as = NULL;
struct token *next;
token = expect(token, '(', "after address_space attribute");
switch (token_type(token)) {
case TOKEN_NUMBER:
next = primary_expression(token, &expr);
if (expr->type != EXPR_VALUE)
goto invalid;
as = numerical_address_space(expr->value);
break;
case TOKEN_IDENT:
next = token->next;
as = token->ident;
break;
default:
next = token->next;
invalid:
as = NULL;
warning(token->pos, "invalid address space name");
}
if (Waddress_space && as) {
if (ctx->ctype.as)
sparse_error(token->pos,
"multiple address spaces given: %s & %s",
show_as(ctx->ctype.as), show_as(as));
ctx->ctype.as = as;
}
token = expect(next, ')', "after address_space attribute");
return token;
}
static struct symbol *to_QI_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
if (ctype == &char_ctype)
return ctype;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &uchar_ctype
: &schar_ctype;
}
static struct symbol *to_HI_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &ushort_ctype
: &sshort_ctype;
}
static struct symbol *to_SI_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint_ctype
: &sint_ctype;
}
static struct symbol *to_DI_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &ullong_ctype
: &sllong_ctype;
}
static struct symbol *to_TI_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &uint128_ctype
: &sint128_ctype;
}
static struct symbol *to_pointer_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? uintptr_ctype
: intptr_ctype;
}
static struct symbol *to_word_mode(struct symbol *ctype)
{
if (ctype->ctype.base_type != &int_type)
return NULL;
return ctype->ctype.modifiers & MOD_UNSIGNED ? &ulong_ctype
: &slong_ctype;
}
static struct token *attribute_mode(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
token = expect(token, '(', "after mode attribute");
if (token_type(token) == TOKEN_IDENT) {
struct symbol *mode = lookup_keyword(token->ident, NS_KEYWORD);
if (mode && mode->op->type & KW_MODE)
ctx->mode = mode->op;
else
sparse_error(token->pos, "unknown mode attribute %s", show_ident(token->ident));
token = token->next;
} else
sparse_error(token->pos, "expect attribute mode symbol\n");
token = expect(token, ')', "after mode attribute");
return token;
}
static struct token *attribute_context(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
struct context *context = alloc_context();
struct expression *args[3];
int idx = 0;
token = expect(token, '(', "after context attribute");
token = conditional_expression(token, &args[0]);
token = expect(token, ',', "after context 1st argument");
token = conditional_expression(token, &args[1]);
if (match_op(token, ',')) {
token = token->next;
token = conditional_expression(token, &args[2]);
token = expect(token, ')', "after context 3rd argument");
context->context = args[0];
idx++;
} else {
token = expect(token, ')', "after context 2nd argument");
}
context->in = get_expression_value(args[idx++]);
context->out = get_expression_value(args[idx++]);
add_ptr_list(&ctx->ctype.contexts, context);
return token;
}
static struct token *attribute_designated_init(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_STRUCT)
ctx->ctype.base_type->designated_init = 1;
else
warning(token->pos, "attribute designated_init applied to non-structure type");
return token;
}
static struct token *attribute_transparent_union(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
if (Wtransparent_union)
warning(token->pos, "attribute __transparent_union__");
if (ctx->ctype.base_type && ctx->ctype.base_type->type == SYM_UNION)
ctx->ctype.base_type->transparent_union = 1;
else
warning(token->pos, "attribute __transparent_union__ applied to non-union type");
return token;
}
static struct token *recover_unknown_attribute(struct token *token)
{
struct expression *expr = NULL;
if (Wunknown_attribute)
warning(token->pos, "unknown attribute '%s'", show_ident(token->ident));
token = token->next;
if (match_op(token, '('))
token = parens_expression(token, &expr, "in attribute");
return token;
}
static struct token *attribute_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
token = expect(token, '(', "after attribute");
token = expect(token, '(', "after attribute");
while (token_type(token) == TOKEN_IDENT) {
struct symbol *attr = lookup_keyword(token->ident, NS_KEYWORD);
if (attr && attr->op->attribute)
token = attr->op->attribute(token->next, attr, ctx);
else
token = recover_unknown_attribute(token);
if (!match_op(token, ','))
break;
token = token->next;
}
token = expect(token, ')', "after attribute");
token = expect(token, ')', "after attribute");
return token;
}
static unsigned long decl_modifiers(struct decl_state *ctx)
{
unsigned long mods = ctx->ctype.modifiers & MOD_DECLARE;
ctx->ctype.modifiers &= ~MOD_DECLARE;
return ctx->storage_class | mods;
}
static struct token *storage_specifier(struct token *next, struct symbol *sym, struct decl_state *ctx)
{
int is_tls = ctx->ctype.modifiers & MOD_TLS;
unsigned long class = sym->ctype.modifiers;
const char *storage = modifier_name(class);
/* __thread can be used alone, or with extern or static */
if (is_tls && (class & ~(MOD_STATIC|MOD_EXTERN)))
sparse_error(next->pos, "__thread cannot be used with '%s'", storage);
else if (!ctx->storage_class)
ctx->storage_class = class;
else if (ctx->storage_class == class)
sparse_error(next->pos, "duplicate %s", storage);
else
sparse_error(next->pos, "multiple storage classes");
return next;
}
static struct token *thread_specifier(struct token *next, struct symbol *sym, struct decl_state *ctx)
{
/* This GCC extension can be used alone, or with extern or static */
if (!(ctx->storage_class & ~(MOD_STATIC|MOD_EXTERN))) {
apply_qualifier(&next->pos, &ctx->ctype, MOD_TLS);
} else {
sparse_error(next->pos, "__thread cannot be used with '%s'",
modifier_name(ctx->storage_class));
}
return next;
}
static struct token *attribute_force(struct token *token, struct symbol *attr, struct decl_state *ctx)
{
ctx->forced = 1;
return token;
}
static struct token *alignas_specifier(struct token *token, struct symbol *sym, struct decl_state *ctx)
{
int alignment = 0;
if (!match_op(token, '(')) {
sparse_error(token->pos, "expected '(' after _Alignas");
return token;
}
if (lookup_type(token->next)) {
struct symbol *sym = NULL;
token = typename(token->next, &sym, NULL);
sym = examine_symbol_type(sym);
alignment = sym->ctype.alignment;
token = expect(token, ')', "after _Alignas(...");
} else {
struct expression *expr = NULL;
token = parens_expression(token, &expr, "after _Alignas");
if (!expr)
return token;
alignment = const_expression_value(expr);
}
if (alignment < 0) {
warning(token->pos, "non-positive alignment");
return token;
}
if (alignment & (alignment-1)) {
warning(token->pos, "non-power-of-2 alignment");
return token;
}
if (alignment > ctx->ctype.alignment)
ctx->ctype.alignment = alignment;
return token;
}
static struct token *generic_qualifier(struct token *next, struct symbol *sym, struct decl_state *ctx)
{
apply_qualifier(&next->pos, &ctx->ctype, sym->ctype.modifiers);
return next;
}
static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
{
unsigned long mod = thistype->modifiers;
if (mod)
apply_qualifier(&pos, ctype, mod);
/* Context */
concat_ptr_list((struct ptr_list *)thistype->contexts,
(struct ptr_list **)&ctype->contexts);
/* Alignment */
if (thistype->alignment > ctype->alignment)
ctype->alignment = thistype->alignment;
/* Address space */
if (thistype->as)
ctype->as = thistype->as;
}
static void specifier_conflict(struct position pos, int what, struct ident *new)
{
const char *old;
if (what & (Set_S | Set_T))
goto Catch_all;
if (what & Set_Char)
old = "char";
else if (what & Set_Double)
old = "double";
else if (what & Set_Float)
old = "float";
else if (what & Set_Signed)
old = "signed";
else if (what & Set_Unsigned)
old = "unsigned";
else if (what & Set_Short)
old = "short";
else if (what & Set_Long)
old = "long";
else
old = "long long";
sparse_error(pos, "impossible combination of type specifiers: %s %s",
old, show_ident(new));
return;
Catch_all:
sparse_error(pos, "two or more data types in declaration specifiers");
}
static struct symbol * const int_types[] =
{&char_ctype, &short_ctype, &int_ctype, &long_ctype, &llong_ctype, &int128_ctype};
static struct symbol * const signed_types[] =
{&schar_ctype, &sshort_ctype, &sint_ctype, &slong_ctype, &sllong_ctype,
&sint128_ctype};
static struct symbol * const unsigned_types[] =
{&uchar_ctype, &ushort_ctype, &uint_ctype, &ulong_ctype, &ullong_ctype,
&uint128_ctype};
static struct symbol * const real_types[] =
{&float_ctype, &double_ctype, &ldouble_ctype};
static struct symbol * const * const types[] = {
[CInt] = int_types + 2,
[CSInt] = signed_types + 2,
[CUInt] = unsigned_types + 2,
[CReal] = real_types + 1,
};
struct symbol *ctype_integer(int size, int want_unsigned)
{
return types[want_unsigned ? CUInt : CInt][size];
}
static struct token *handle_qualifiers(struct token *t, struct decl_state *ctx)
{
while (token_type(t) == TOKEN_IDENT) {
struct symbol *s = lookup_keyword(t->ident, NS_TYPEDEF);
if (!s)
break;
if (!(s->op->type & (KW_ATTRIBUTE | KW_QUALIFIER)))
break;
t = t->next;
if (s->op->declarator)
t = s->op->declarator(t, s, ctx);
}
return t;
}
static struct token *declaration_specifiers(struct token *token, struct decl_state *ctx)
{
int seen = 0;
int class = CInt;
int rank = 0;
while (token_type(token) == TOKEN_IDENT) {
struct symbol *s = lookup_symbol(token->ident,
NS_TYPEDEF | NS_SYMBOL);
if (!s || !(s->namespace & NS_TYPEDEF))
break;
if (s->type != SYM_KEYWORD) {
if (seen & Set_Any)
break;
seen |= Set_S | Set_T;
ctx->ctype.base_type = s->ctype.base_type;
apply_ctype(token->pos, &s->ctype, &ctx->ctype);
token = token->next;
continue;
}
if (s->op->type & KW_SPECIFIER) {
if (seen & s->op->test) {
specifier_conflict(token->pos,
seen & s->op->test,
token->ident);
break;
}
seen |= s->op->set;
class += s->op->class;
if (s->op->set & Set_Int128)
rank = 3;
else if (s->op->set & Set_Char)
rank = -2;
if (s->op->set & (Set_Short|Set_Float)) {
rank = -1;
} else if (s->op->set & Set_Long && rank++) {
if (class == CReal) {
specifier_conflict(token->pos,
Set_Vlong,
&double_ident);
break;
}
seen |= Set_Vlong;
}
}
token = token->next;
if (s->op->declarator) // Note: this eats attributes
token = s->op->declarator(token, s, ctx);
if (s->op->type & KW_EXACT) {
ctx->ctype.base_type = s->ctype.base_type;
ctx->ctype.modifiers |= s->ctype.modifiers;
}
}
if (!(seen & Set_S)) { /* not set explicitly? */
struct symbol *base = &incomplete_ctype;
if (seen & Set_Any)
base = types[class][rank];
ctx->ctype.base_type = base;
}
if (ctx->ctype.modifiers & MOD_BITWISE) {
struct symbol *type;
ctx->ctype.modifiers &= ~MOD_BITWISE;
if (!is_int_type(ctx->ctype.base_type)) {
sparse_error(token->pos, "invalid modifier");
return token;
}
type = alloc_symbol(token->pos, SYM_BASETYPE);
*type = *ctx->ctype.base_type;
type->ctype.modifiers &= ~MOD_SPECIFIER;
type->ctype.base_type = ctx->ctype.base_type;
type->type = SYM_RESTRICT;
ctx->ctype.base_type = type;
create_fouled(type);
}
return token;
}
static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
{
struct expression *expr = NULL;
int has_static = 0;
while (token_type(token) == TOKEN_IDENT) {
struct symbol *sym = lookup_keyword(token->ident, NS_TYPEDEF);
if (!sym || !(sym->op->type & (KW_STATIC|KW_QUALIFIER)))
break;
if (has_static && (sym->op->type & KW_STATIC))
sparse_error(token->pos, "duplicate array static declarator");
has_static |= (sym->op->type & KW_STATIC);
token = token->next;
}
if (match_op(token, '*') && match_op(token->next, ']')) {
// FIXME: '[*]' is treated like '[]'
token = token->next;
} else {
token = assignment_expression(token, &expr);
}
sym->array_size = expr;
return token;
}
static struct token *parameter_type_list(struct token *, struct symbol *);
static struct token *identifier_list(struct token *, struct symbol *);
static struct token *declarator(struct token *token, struct decl_state *ctx);
static struct token *handle_asm_name(struct token *token, struct decl_state *ctx)
{
struct expression *expr;
struct symbol *keyword;
if (token_type(token) != TOKEN_IDENT)
return token;
keyword = lookup_keyword(token->ident, NS_KEYWORD);
if (!keyword)
return token;
if (!(keyword->op->type & KW_ASM))
return token;
token = token->next;
token = expect(token, '(', "after asm");
token = string_expression(token, &expr, "asm name");
token = expect(token, ')', "after asm");
return token;
}
///
// test if @token is '__attribute__' (or one of its variant)
static bool match_attribute(struct token *token)
{
struct symbol *sym;
if (token_type(token) != TOKEN_IDENT)
return false;
sym = lookup_keyword(token->ident, NS_TYPEDEF);
if (!sym)
return false;
return sym->op->type & KW_ATTRIBUTE;
}
static struct token *skip_attribute(struct token *token)
{
token = token->next;
if (match_op(token, '(')) {
int depth = 1;
token = token->next;
while (depth && !eof_token(token)) {
if (token_type(token) == TOKEN_SPECIAL) {
if (token->special == '(')
depth++;
else if (token->special == ')')
depth--;
}
token = token->next;
}
}
return token;
}
static struct token *skip_attributes(struct token *token)
{
while (match_attribute(token)) {
token = expect(token->next, '(', "after attribute");
token = expect(token, '(', "after attribute");
while (token_type(token) == TOKEN_IDENT) {
token = skip_attribute(token);
if (!match_op(token, ','))
break;
token = token->next;
}
token = expect(token, ')', "after attribute");
token = expect(token, ')', "after attribute");
}
return token;
}
static struct token *handle_attributes(struct token *token, struct decl_state *ctx)
{
while (match_attribute(token))
token = attribute_specifier(token->next, NULL, ctx);
return token;
}
static int is_nested(struct token *token, struct token **p,
int prefer_abstract)
{
/*
* This can be either a parameter list or a grouping.
* For the direct (non-abstract) case, we know if must be
* a parameter list if we already saw the identifier.
* For the abstract case, we know if must be a parameter
* list if it is empty or starts with a type.
*/
struct token *next = token->next;
*p = next = skip_attributes(next);
if (token_type(next) == TOKEN_IDENT) {
if (lookup_type(next))
return !prefer_abstract;
return 1;
}
if (match_op(next, ')') || match_op(next, SPECIAL_ELLIPSIS))
return 0;
return 1;
}
enum kind {
Empty, K_R, Proto, Bad_Func,
};
static enum kind which_func(struct token *token,
struct ident **n,
int prefer_abstract)
{
struct token *next = token->next;
if (token_type(next) == TOKEN_IDENT) {
if (lookup_type(next))
return Proto;
/* identifier list not in definition; complain */
if (prefer_abstract)
warning(token->pos,
"identifier list not in definition");
return K_R;
}
if (token_type(next) != TOKEN_SPECIAL)
return Bad_Func;
if (next->special == ')') {
/* don't complain about those */
if (!n || match_op(next->next, ';') || match_op(next->next, ','))
return Empty;
if (Wstrict_prototypes)
warning(next->pos,
"non-ANSI function declaration of function '%s'",
show_ident(*n));
return Empty;
}
if (next->special == SPECIAL_ELLIPSIS) {
warning(next->pos,
"variadic functions must have one named argument");
return Proto;
}
return Bad_Func;
}
static struct token *direct_declarator(struct token *token, struct decl_state *ctx)
{
struct ctype *ctype = &ctx->ctype;
struct token *next;
struct ident **p = ctx->ident;
if (ctx->ident && token_type(token) == TOKEN_IDENT) {
*ctx->ident = token->ident;
token = token->next;
} else if (match_op(token, '(') &&
is_nested(token, &next, ctx->prefer_abstract)) {
struct symbol *base_type = ctype->base_type;
if (token->next != next)
next = handle_attributes(token->next, ctx);
token = declarator(next, ctx);
token = expect(token, ')', "in nested declarator");
while (ctype->base_type != base_type)
ctype = &ctype->base_type->ctype;
p = NULL;
}
if (match_op(token, '(')) {
enum kind kind = which_func(token, p, ctx->prefer_abstract);
struct symbol *fn;
fn = alloc_indirect_symbol(token->pos, ctype, SYM_FN);
ctype->modifiers |= ctx->f_modifiers;
token = token->next;
if (kind == K_R)
token = identifier_list(token, fn);
else if (kind == Proto)
token = parameter_type_list(token, fn);
token = expect(token, ')', "in function declarator");
fn->endpos = token->pos;
return token;
}
while (match_op(token, '[')) {
struct symbol *array;
array = alloc_indirect_symbol(token->pos, ctype, SYM_ARRAY);
token = abstract_array_declarator(token->next, array);
token = expect(token, ']', "in abstract_array_declarator");
array->endpos = token->pos;
ctype = &array->ctype;
}
return token;
}
static struct token *pointer(struct token *token, struct decl_state *ctx)
{
while (match_op(token,'*')) {
struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
ptr->ctype.modifiers = ctx->ctype.modifiers;
ptr->ctype.base_type = ctx->ctype.base_type;
ptr->ctype.as = ctx->ctype.as;
ptr->ctype.contexts = ctx->ctype.contexts;
ctx->ctype.modifiers = 0;
ctx->ctype.base_type = ptr;
ctx->ctype.as = NULL;
ctx->ctype.contexts = NULL;
ctx->ctype.alignment = 0;
token = handle_qualifiers(token->next, ctx);
ctx->ctype.base_type->endpos = token->pos;
}
return token;
}
static struct token *declarator(struct token *token, struct decl_state *ctx)
{
token = pointer(token, ctx);
return direct_declarator(token, ctx);
}
static struct token *handle_bitfield(struct token *token, struct decl_state *ctx)
{
struct ctype *ctype = &ctx->ctype;
struct expression *expr;
struct symbol *bitfield;
long long width;
if (ctype->base_type != &int_type && !is_int_type(ctype->base_type)) {
sparse_error(token->pos, "invalid bitfield specifier for type %s.",
show_typename(ctype->base_type));
// Parse this to recover gracefully.
return conditional_expression(token->next, &expr);
}
bitfield = alloc_indirect_symbol(token->pos, ctype, SYM_BITFIELD);
token = conditional_expression(token->next, &expr);
width = const_expression_value(expr);
bitfield->bit_size = width;
if (width < 0 || width > INT_MAX || (*ctx->ident && width == 0)) {
sparse_error(token->pos, "bitfield '%s' has invalid width (%lld)",
show_ident(*ctx->ident), width);
width = -1;
} else if (*ctx->ident) {
struct symbol *base_type = bitfield->ctype.base_type;
struct symbol *bitfield_type = base_type == &int_type ? bitfield : base_type;
int is_signed = !(bitfield_type->ctype.modifiers & MOD_UNSIGNED);
if (Wone_bit_signed_bitfield && width == 1 && is_signed) {
// Valid values are either {-1;0} or {0}, depending on integer
// representation. The latter makes for very efficient code...
sparse_error(token->pos, "dubious one-bit signed bitfield");
}
if (Wdefault_bitfield_sign &&
bitfield_type->type != SYM_ENUM &&
!(bitfield_type->ctype.modifiers & MOD_EXPLICITLY_SIGNED) &&
is_signed) {
// The sign of bitfields is unspecified by default.
warning(token->pos, "dubious bitfield without explicit `signed' or `unsigned'");
}
}
bitfield->bit_size = width;
bitfield->endpos = token->pos;
bitfield->ident = *ctx->ident;
return token;
}
static struct token *declaration_list(struct token *token, struct symbol_list **list)
{
struct decl_state ctx = {.prefer_abstract = 0};
struct ctype saved;
unsigned long mod;
token = declaration_specifiers(token, &ctx);
mod = decl_modifiers(&ctx);
saved = ctx.ctype;
for (;;) {
struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
ctx.ident = &decl->ident;
token = declarator(token, &ctx);
if (match_op(token, ':'))
token = handle_bitfield(token, &ctx);
token = handle_attributes(token, &ctx);
apply_modifiers(token->pos, &ctx);
decl->ctype = ctx.ctype;
decl->ctype.modifiers |= mod;
decl->endpos = token->pos;
add_symbol(list, decl);
if (!match_op(token, ','))
break;
token = token->next;
ctx.ctype = saved;
}
return token;
}
static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
{
while (!match_op(token, '}')) {
if (match_ident(token, &_Static_assert_ident)) {
token = parse_static_assert(token, NULL);
continue;
}
if (!match_op(token, ';'))
token = declaration_list(token, list);
if (!match_op(token, ';')) {
sparse_error(token->pos, "expected ; at end of declaration");
break;
}
token = token->next;
}
return token;
}
static struct token *parameter_declaration(struct token *token, struct symbol *sym)
{
struct decl_state ctx = {.prefer_abstract = 1};
token = declaration_specifiers(token, &ctx);
ctx.ident = &sym->ident;
token = declarator(token, &ctx);
token = handle_attributes(token, &ctx);
apply_modifiers(token->pos, &ctx);
sym->ctype = ctx.ctype;
sym->ctype.modifiers |= decl_modifiers(&ctx);
sym->endpos = token->pos;
sym->forced_arg = ctx.forced;
return token;
}
struct token *typename(struct token *token, struct symbol **p, int *forced)
{
struct decl_state ctx = {.prefer_abstract = 1};
unsigned long class;
struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
*p = sym;
token = declaration_specifiers(token, &ctx);
token = declarator(token, &ctx);
apply_modifiers(token->pos, &ctx);
sym->ctype = ctx.ctype;
sym->endpos = token->pos;
class = ctx.storage_class;
if (forced)
*forced = ctx.forced;
if (class)
warning(sym->pos, "storage class in typename (%s%s)",
modifier_string(class), show_typename(sym));
return token;
}
static struct token *expression_statement(struct token *token, struct expression **tree)
{
token = parse_expression(token, tree);
return expect(token, ';', "at end of statement");
}
static struct token *parse_asm_operands(struct token *token, struct statement *stmt,
struct asm_operand_list **inout)
{
/* Allow empty operands */
if (match_op(token->next, ':') || match_op(token->next, ')'))
return token->next;
do {
struct asm_operand *op = __alloc_asm_operand(0);
if (match_op(token->next, '[') &&
token_type(token->next->next) == TOKEN_IDENT &&
match_op(token->next->next->next, ']')) {
op->name = token->next->next->ident;
token = token->next->next->next;
}
token = token->next;
token = string_expression(token, &op->constraint, "asm constraint");
token = parens_expression(token, &op->expr, "in asm parameter");
add_ptr_list(inout, op);
} while (match_op(token, ','));
return token;
}
static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt,
struct expression_list **clobbers)
{
struct expression *expr;
do {
token = primary_expression(token->next, &expr);
if (expr)
add_expression(clobbers, expr);
} while (match_op(token, ','));
return token;
}
static struct token *parse_asm_labels(struct token *token, struct statement *stmt,
struct symbol_list **labels)
{
struct symbol *label;
do {
token = token->next; /* skip ':' and ',' */
if (token_type(token) != TOKEN_IDENT)
return token;
label = label_symbol(token, 1);
add_symbol(labels, label);
token = token->next;
} while (match_op(token, ','));
return token;
}
static struct token *parse_asm_statement(struct token *token, struct statement *stmt)
{
unsigned long mods = 0;
token = token->next;
stmt->type = STMT_ASM;
while (token_type(token) == TOKEN_IDENT) {
struct symbol *s = lookup_keyword(token->ident, NS_TYPEDEF);
if (s && s->op->asm_modifier)
s->op->asm_modifier(token, &mods, s->ctype.modifiers);
else if (token->ident == &goto_ident)
asm_modifier(token, &mods, MOD_ASM_GOTO);
token = token->next;
}
token = expect(token, '(', "after asm");
token = string_expression(token, &stmt->asm_string, "inline asm");
if (match_op(token, ':'))
token = parse_asm_operands(token, stmt, &stmt->asm_outputs);
if (match_op(token, ':'))
token = parse_asm_operands(token, stmt, &stmt->asm_inputs);
if (match_op(token, ':'))
token = parse_asm_clobbers(token, stmt, &stmt->asm_clobbers);
if (match_op(token, ':') && (mods & MOD_ASM_GOTO))
token = parse_asm_labels(token, stmt, &stmt->asm_labels);
token = expect(token, ')', "after asm");
return expect(token, ';', "at end of asm-statement");
}
static struct token *parse_static_assert(struct token *token, struct symbol_list **unused)
{
struct expression *cond = NULL, *message = NULL;
token = expect(token->next, '(', "after _Static_assert");
token = constant_expression(token, &cond);
if (!cond)
sparse_error(token->pos, "Expected constant expression");
if (match_op(token, ',')) {
token = token->next;
token = string_expression(token, &message, "_Static_assert()");
if (!message)
cond = NULL;
}
token = expect(token, ')', "after diagnostic message in _Static_assert");
token = expect(token, ';', "after _Static_assert()");
if (cond && !const_expression_value(cond) && cond->type == EXPR_VALUE) {
const char *sep = "", *msg = "";
if (message) {
sep = ": ";
msg = show_string(message->string);
}
sparse_error(cond->pos, "static assertion failed%s%s", sep, msg);
}
return token;
}
/* Make a statement out of an expression */
static struct statement *make_statement(struct expression *expr)
{
struct statement *stmt;
if (!expr)
return NULL;
stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
stmt->expression = expr;
return stmt;
}
/*
* All iterators have two symbols associated with them:
* the "continue" and "break" symbols, which are targets
* for continue and break statements respectively.
*
* They are in a special name-space, but they follow
* all the normal visibility rules, so nested iterators
* automatically work right.
*/
static void start_iterator(struct statement *stmt)
{
struct symbol *cont, *brk;
start_block_scope();
cont = alloc_symbol(stmt->pos, SYM_NODE);
bind_symbol(cont, &continue_ident, NS_ITERATOR);
brk = alloc_symbol(stmt->pos, SYM_NODE);
bind_symbol(brk, &break_ident, NS_ITERATOR);
stmt->type = STMT_ITERATOR;
stmt->iterator_break = brk;
stmt->iterator_continue = cont;
fn_local_symbol(brk);
fn_local_symbol(cont);
}
static void end_iterator(struct statement *stmt)
{
end_block_scope();
}
static struct statement *start_function(struct symbol *sym)
{
struct symbol *ret;
struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
start_function_scope();
ret = alloc_symbol(sym->pos, SYM_NODE);
ret->ctype = sym->ctype.base_type->ctype;
ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_QUALIFIER | MOD_TLS | MOD_ACCESS | MOD_NOCAST | MOD_NODEREF);
ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
bind_symbol(ret, &return_ident, NS_ITERATOR);
stmt->ret = ret;
fn_local_symbol(ret);
// Currently parsed symbol for __func__/__FUNCTION__/__PRETTY_FUNCTION__
current_fn = sym;
return stmt;
}
static void end_function(struct symbol *sym)
{
current_fn = NULL;
end_function_scope();
}
/*
* A "switch()" statement, like an iterator, has a
* the "break" symbol associated with it. It works
* exactly like the iterator break - it's the target
* for any break-statements in scope, and means that
* "break" handling doesn't even need to know whether
* it's breaking out of an iterator or a switch.
*
* In addition, the "case" symbol is a marker for the
* case/default statements to find the switch statement
* that they are associated with.
*/
static void start_switch(struct statement *stmt)
{
struct symbol *brk, *switch_case;
start_block_scope();
brk = alloc_symbol(stmt->pos, SYM_NODE);
bind_symbol(brk, &break_ident, NS_ITERATOR);
switch_case = alloc_symbol(stmt->pos, SYM_NODE);
bind_symbol(switch_case, &case_ident, NS_ITERATOR);
switch_case->stmt = stmt;
stmt->type = STMT_SWITCH;
stmt->switch_break = brk;
stmt->switch_case = switch_case;
fn_local_symbol(brk);
fn_local_symbol(switch_case);
}
static void end_switch(struct statement *stmt)
{
if (!stmt->switch_case->symbol_list)
warning(stmt->pos, "switch with no cases");
end_block_scope();
}
static void add_case_statement(struct statement *stmt)
{
struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
struct symbol *sym;
if (!target) {
sparse_error(stmt->pos, "not in switch scope");
stmt->type = STMT_NONE;
return;
}
sym = alloc_symbol(stmt->pos, SYM_NODE);
add_symbol(&target->symbol_list, sym);
sym->stmt = stmt;
stmt->case_label = sym;
fn_local_symbol(sym);
}
static struct token *parse_return_statement(struct token *token, struct statement *stmt)
{
struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
if (!target)
error_die(token->pos, "internal error: return without a function target");
stmt->type = STMT_RETURN;
stmt->ret_target = target;
return expression_statement(token->next, &stmt->ret_value);
}
static void validate_for_loop_decl(struct symbol *sym)
{
unsigned long storage = sym->ctype.modifiers & MOD_STORAGE;
if (storage & ~(MOD_AUTO | MOD_REGISTER)) {
const char *name = show_ident(sym->ident);
sparse_error(sym->pos, "non-local var '%s' in for-loop initializer", name);
sym->ctype.modifiers &= ~MOD_STORAGE;
}
}
static struct token *parse_for_statement(struct token *token, struct statement *stmt)
{
struct symbol_list *syms;
struct expression *e1, *e2, *e3;
struct statement *iterator;
start_iterator(stmt);
token = expect(token->next, '(', "after 'for'");
syms = NULL;
e1 = NULL;
/* C99 variable declaration? */
if (lookup_type(token)) {
token = external_declaration(token, &syms, validate_for_loop_decl);
} else {
token = parse_expression(token, &e1);
token = expect(token, ';', "in 'for'");
}
token = parse_expression(token, &e2);
token = expect(token, ';', "in 'for'");
token = parse_expression(token, &e3);
token = expect(token, ')', "in 'for'");
token = statement(token, &iterator);
stmt->iterator_syms = syms;
stmt->iterator_pre_statement = make_statement(e1);
stmt->iterator_pre_condition = e2;
stmt->iterator_post_statement = make_statement(e3);
stmt->iterator_post_condition = NULL;
stmt->iterator_statement = iterator;
end_iterator(stmt);
return token;
}
static struct token *parse_while_statement(struct token *token, struct statement *stmt)
{
struct expression *expr;
struct statement *iterator;
start_iterator(stmt);
token = parens_expression(token->next, &expr, "after 'while'");
token = statement(token, &iterator);
stmt->iterator_pre_condition = expr;
stmt->iterator_post_condition = NULL;
stmt->iterator_statement = iterator;
end_iterator(stmt);
return token;
}
static struct token *parse_do_statement(struct token *token, struct statement *stmt)
{
struct expression *expr;
struct statement *iterator;
start_iterator(stmt);
token = statement(token->next, &iterator);
if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
token = token->next;
else
sparse_error(token->pos, "expected 'while' after 'do'");
token = parens_expression(token, &expr, "after 'do-while'");
stmt->iterator_post_condition = expr;
stmt->iterator_statement = iterator;
end_iterator(stmt);
if (iterator && iterator->type != STMT_COMPOUND && Wdo_while)
warning(iterator->pos, "do-while statement is not a compound statement");
return expect(token, ';', "after statement");
}
static struct token *parse_if_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_IF;
token = parens_expression(token->next, &stmt->if_conditional, "after if");
token = statement(token, &stmt->if_true);
if (token_type(token) != TOKEN_IDENT)
return token;
if (token->ident != &else_ident)
return token;
return statement(token->next, &stmt->if_false);
}
static inline struct token *case_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_CASE;
token = expect(token, ':', "after default/case");
add_case_statement(stmt);
return statement(token, &stmt->case_statement);
}
static struct token *parse_case_statement(struct token *token, struct statement *stmt)
{
token = parse_expression(token->next, &stmt->case_expression);
if (match_op(token, SPECIAL_ELLIPSIS))
token = parse_expression(token->next, &stmt->case_to);
return case_statement(token, stmt);
}
static struct token *parse_default_statement(struct token *token, struct statement *stmt)
{
return case_statement(token->next, stmt);
}
static struct token *parse_loop_iterator(struct token *token, struct statement *stmt)
{
struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
stmt->type = STMT_GOTO;
stmt->goto_label = target;
if (!target)
sparse_error(stmt->pos, "break/continue not in iterator scope");
return expect(token->next, ';', "at end of statement");
}
static struct token *parse_switch_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_SWITCH;
start_switch(stmt);
token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
token = statement(token, &stmt->switch_statement);
end_switch(stmt);
return token;
}
static void warn_label_usage(struct position def, struct position use, struct ident *ident)
{
const char *id = show_ident(ident);
sparse_error(use, "label '%s' used outside statement expression", id);
info(def, " label '%s' defined here", id);
current_fn->bogus_linear = 1;
}
void check_label_usage(struct symbol *label, struct position use_pos)
{
struct statement *def = label->stmt;
if (def) {
if (!is_in_scope(def->label_scope, label_scope))
warn_label_usage(def->pos, use_pos, label->ident);
} else if (!label->label_scope) {
label->label_scope = label_scope;
label->label_pos = use_pos;
}
}
static struct token *parse_goto_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_GOTO;
token = token->next;
if (match_op(token, '*')) {
token = parse_expression(token->next, &stmt->goto_expression);
add_statement(&function_computed_goto_list, stmt);
} else if (token_type(token) == TOKEN_IDENT) {
struct symbol *label = label_symbol(token, 1);
stmt->goto_label = label;
check_label_usage(label, stmt->pos);
token = token->next;
} else {
sparse_error(token->pos, "Expected identifier or goto expression");
}
return expect(token, ';', "at end of statement");
}
static struct token *parse_context_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_CONTEXT;
token = token->next;
token = expect(token, '(', "after __context__ statement");
token = assignment_expression(token, &stmt->expression);
if (!stmt->expression)
unexpected(token, "expression expected after '('");
if (match_op(token, ',')) {
token = token->next;
stmt->context = stmt->expression;
token = assignment_expression(token, &stmt->expression);
if (!stmt->expression)
unexpected(token, "expression expected after ','");
}
token = expect(token, ')', "at end of __context__ statement");
return expect(token, ';', "at end of statement");
}
static struct token *parse_range_statement(struct token *token, struct statement *stmt)
{
stmt->type = STMT_RANGE;
token = token->next;
token = expect(token, '(', "after __range__ statement");
token = assignment_expression(token, &stmt->range_expression);
token = expect(token, ',', "after range expression");
token = assignment_expression(token, &stmt->range_low);
token = expect(token, ',', "after low range");
token = assignment_expression(token, &stmt->range_high);
token = expect(token, ')', "after range statement");
return expect(token, ';', "after range statement");
}
static struct token *handle_label_attributes(struct token *token, struct symbol *label)
{
struct decl_state ctx = { };
token = handle_attributes(token, &ctx);
label->label_modifiers = ctx.ctype.modifiers;
return token;
}
static struct token *statement(struct token *token, struct statement **tree)
{
struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
*tree = stmt;
if (token_type(token) == TOKEN_IDENT) {
struct symbol *s = lookup_keyword(token->ident, NS_KEYWORD);
if (s && s->op->statement)
return s->op->statement(token, stmt);
if (match_op(token->next, ':')) {
struct symbol *s = label_symbol(token, 0);
token = handle_label_attributes(token->next->next, s);
if (s->stmt) {
sparse_error(stmt->pos, "label '%s' redefined", show_ident(s->ident));
// skip the label to avoid multiple definitions
return statement(token, tree);
}
stmt->type = STMT_LABEL;
stmt->label_identifier = s;
stmt->label_scope = label_scope;
if (s->label_scope) {
if (!is_in_scope(label_scope, s->label_scope))
warn_label_usage(stmt->pos, s->label_pos, s->ident);
}
s->stmt = stmt;
return statement(token, &stmt->label_statement);
}
}
if (match_op(token, '{')) {
token = compound_statement(token->next, stmt);
return expect(token, '}', "at end of compound statement");
}
stmt->type = STMT_EXPRESSION;
return expression_statement(token, &stmt->expression);
}
/* gcc extension - __label__ ident-list; in the beginning of compound stmt */
static struct token *label_statement(struct token *token)
{
while (token_type(token) == TOKEN_IDENT) {
struct symbol *sym = alloc_symbol(token->pos, SYM_LABEL);
/* it's block-scope, but we want label namespace */
bind_symbol_with_scope(sym, token->ident, NS_LABEL, block_scope);
fn_local_symbol(sym);
token = token->next;
if (!match_op(token, ','))
break;
token = token->next;
}
return expect(token, ';', "at end of label declaration");
}