[PATCH] trivial ansi-c declear

[smatch.git] / parse.c

/*
 * Stupid C parser, version 1e-6.
 *
 * Let's see how hard this is to do.
 *
 * Copyright (C) 2003 Transmeta Corp.
 *               2003 Linus Torvalds
 *
 *  Licensed under the Open Software License version 1.1
 */

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>

#include "lib.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;

// Add a symbol to the list of function-local symbols
#define fn_local_symbol(x) add_symbol(function_symbol_list, (x))

static struct token *statement(struct token *token, struct statement **tree);
static struct token *external_declaration(struct token *token, struct symbol_list **list);

static int match_idents(struct token *token, ...)
{
        va_list args;

        if (token_type(token) != TOKEN_IDENT)
                return 0;

        va_start(args, token);
        for (;;) {
                struct ident * next = va_arg(args, struct ident *);
                if (!next)
                        return 0;
                if (token->ident == next)
                        return 1;
        }
}


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 struct symbol * indirect(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 & ~MOD_STORAGE;

        ctype->base_type = sym;
        ctype->modifiers &= MOD_STORAGE;
        return sym;
}

static struct symbol *lookup_or_create_symbol(enum namespace ns, enum type type, struct token *token)
{
        struct symbol *sym = lookup_symbol(token->ident, ns);
        if (!sym) {
                sym = alloc_symbol(token->pos, type);
                sym->ident = token->ident;
                bind_symbol(sym, token->ident, ns);
                if (type == SYM_LABEL)
                        fn_local_symbol(sym);
        }
        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)
{
        return lookup_or_create_symbol(NS_LABEL, SYM_LABEL, token);
}

struct token *struct_union_enum_specifier(enum type type,
        struct token *token, struct ctype *ctype,
        struct token *(*parse)(struct token *, struct symbol *))
{
        struct symbol *sym;

        ctype->modifiers = 0;
        if (token_type(token) == TOKEN_IDENT) {
                sym = lookup_symbol(token->ident, NS_STRUCT);
                if (!sym ||
                    (sym->scope != block_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);
                        sym->ident = token->ident;
                        bind_symbol(sym, token->ident, NS_STRUCT);
                }
                if (sym->type != type)
                        error_die(token->pos, "invalid tag applied to %s", show_typename (sym));
                token = token->next;
                ctype->base_type = sym;
                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));
                        token = parse(token->next, sym);
                        token = expect(token, '}', "at end of struct-union-enum-specifier");
                }
                return token;
        }

        // private struct/union/enum type
        if (!match_op(token, '{')) {
                warning(token->pos, "expected declaration");
                ctype->base_type = &bad_type;
                return token;
        }

        sym = alloc_symbol(token->pos, type);
        token = parse(token->next, sym);
        ctype->base_type = sym;
        return expect(token, '}', "at end of specifier");
}

static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
{
        return struct_declaration_list(token, &sym->symbol_list);
}

struct token *struct_or_union_specifier(enum type type, struct token *token, struct ctype *ctype)
{
        return struct_union_enum_specifier(type, token, ctype, parse_struct_declaration);
}

static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
{
        int nextval = 0;
        while (token_type(token) == TOKEN_IDENT) {
                struct token *next = token->next;
                struct symbol *sym;

                sym = alloc_symbol(token->pos, SYM_ENUM);
                bind_symbol(sym, token->ident, NS_SYMBOL);
                sym->ctype.base_type = parent;
                parent->ctype.base_type = &int_ctype;

                if (match_op(next, '=')) {
                        struct expression *expr;
                        next = constant_expression(next->next, &expr);
                        nextval = get_expression_value(expr);
                }
                sym->value = nextval;

                token = next;
                if (!match_op(token, ','))
                        break;
                token = token->next;
                nextval = nextval + 1;
        }
        return token;
}

struct token *enum_specifier(struct token *token, struct ctype *ctype)
{
        return struct_union_enum_specifier(SYM_ENUM, token, ctype, parse_enum_declaration);
}

struct token *typeof_specifier(struct token *token, struct ctype *ctype)
{
        struct symbol *sym;

        if (!match_op(token, '(')) {
                warning(token->pos, "expected '(' after typeof");
                return token;
        }
        if (lookup_type(token->next)) {
                token = typename(token->next, &sym);
                *ctype = sym->ctype;
        } else {
                struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
                token = parse_expression(token->next, &typeof_sym->initializer);

                ctype->modifiers = 0;
                ctype->base_type = typeof_sym;
        }               
        return expect(token, ')', "after typeof");
}

static const char * handle_attribute(struct ctype *ctype, struct ident *attribute, struct expression *expr)
{
        if (attribute == &packed_ident ||
            attribute == &__packed___ident) {
                ctype->alignment = 1;
                return NULL;
        }
        if (attribute == &aligned_ident ||
            attribute == &__aligned___ident) {
                int alignment = max_alignment;
                if (expr)
                        alignment = get_expression_value(expr);
                ctype->alignment = alignment;
                return NULL;
        }
        if (attribute == &nocast_ident) {
                ctype->modifiers |= MOD_NOCAST;
                return NULL;
        }
        if (attribute == &noderef_ident) {
                ctype->modifiers |= MOD_NODEREF;
                return NULL;
        }
        if (attribute == &safe_ident) {
                ctype->modifiers |= MOD_SAFE;
                return NULL;
        }
        if (attribute == &force_ident) {
                ctype->modifiers |= MOD_FORCE;
                return NULL;
        }
        if (attribute == &bitwise_ident) {
                if (Wbitwise)
                        ctype->modifiers |= MOD_BITWISE;
                return NULL;
        }
        if (attribute == &address_space_ident) {
                if (!expr)
                        return "expected address space number";
                ctype->as = get_expression_value(expr);
                return NULL;
        }
        if (attribute == &context_ident) {
                if (expr && expr->type == EXPR_COMMA) {
                        int mask = get_expression_value(expr->left);
                        int value = get_expression_value(expr->right);
                        if (value & ~mask)
                                return "nonsense attribute types";
                        ctype->contextmask |= mask;
                        ctype->context |= value;
                        return NULL;
                }
                return "expected context mask and value";
        }
        if (attribute == &mode_ident ||
            attribute == &__mode___ident) {
                if (expr && expr->type == EXPR_SYMBOL) {
                        struct ident *ident = expr->symbol_name;

                        /*
                         * Match against __QI__/__HI__/__SI__/__DI__
                         *
                         * FIXME! This is broken - we don't actually get
                         * the type information updated properly at this
                         * stage for some reason.
                         */
                        if (ident == &__QI___ident ||
                            ident == &QI_ident) {
                                ctype->modifiers |= MOD_CHAR;
                                ctype->base_type = ctype_integer(ctype->modifiers);
                                return NULL;
                        }
                        if (ident == &__HI___ident ||
                            ident == &HI_ident) {
                                ctype->modifiers |= MOD_SHORT;
                                ctype->base_type = ctype_integer(ctype->modifiers);
                                return NULL;
                        }
                        if (ident == &__SI___ident ||
                            ident == &SI_ident) {
                                /* Nothing? */
                                return NULL;
                        }
                        if (ident == &__DI___ident ||
                            ident == &DI_ident) {
                                ctype->modifiers |= MOD_LONGLONG;
                                ctype->base_type = ctype_integer(ctype->modifiers);
                                return NULL;
                        }
                        if (ident == &__word___ident ||
                            ident == &word_ident) {
                                ctype->modifiers |= MOD_LONG;
                                ctype->base_type = ctype_integer(ctype->modifiers);
                                return NULL;
                        }
                        return "unknown mode attribute";
                }
                return "expected attribute mode symbol";
        }

        /* Throw away for now.. */
        if (attribute == &format_ident ||
            attribute == &__format___ident)
                return NULL;
        if (attribute == &section_ident ||
            attribute == &__section___ident)
                return NULL;
        if (attribute == &unused_ident ||
            attribute == &__unused___ident)
                return NULL;
        if (attribute == &const_ident ||
            attribute == &__const_ident ||
            attribute == &__const___ident)
                return NULL;
        if (attribute == &noreturn_ident ||
            attribute == &__noreturn___ident)
                return NULL;
        if (attribute == &regparm_ident)
                return NULL;
        if (attribute == &weak_ident)
                return NULL;
        if (attribute == &alias_ident)
                return NULL;
        if (attribute == &pure_ident)
                return NULL;
        if (attribute == &always_inline_ident)
                return NULL;
        if (attribute == &syscall_linkage_ident)
                return NULL;
        if (attribute == &visibility_ident)
                return NULL;

        return "unknown attribute";
}

static struct token *attribute_specifier(struct token *token, struct ctype *ctype)
{
        ctype->modifiers = 0;
        token = expect(token, '(', "after attribute");
        token = expect(token, '(', "after attribute");

        for (;;) {
                const char *error;
                struct ident *attribute_name;
                struct expression *attribute_expr;

                if (eof_token(token))
                        break;
                if (match_op(token, ';'))
                        break;
                if (token_type(token) != TOKEN_IDENT)
                        break;
                attribute_name = token->ident;
                token = token->next;
                attribute_expr = NULL;
                if (match_op(token, '('))
                        token = parens_expression(token, &attribute_expr, "in attribute");
                error = handle_attribute(ctype, attribute_name, attribute_expr);
                if (error)
                        warning(token->pos, "attribute '%s': %s", show_ident(attribute_name), error);
                if (!match_op(token, ','))
                        break;
                token = token->next;
        }

        token = expect(token, ')', "after attribute");
        token = expect(token, ')', "after attribute");
        return token;
}

#define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
#define MOD_SPECIFIER (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNED | MOD_UNSIGNED | MOD_EXPLICITLY_SIGNED)

struct symbol * ctype_integer(unsigned long spec)
{
        static struct symbol *const integer_ctypes[][3] = {
                { &llong_ctype, &sllong_ctype, &ullong_ctype },
                { &long_ctype,  &slong_ctype,  &ulong_ctype  },
                { &short_ctype, &sshort_ctype, &ushort_ctype },
                { &char_ctype,  &schar_ctype,  &uchar_ctype  },
                { &int_ctype,   &sint_ctype,   &uint_ctype   },
        };
        struct symbol *const (*ctype)[3];
        int sub;

        ctype = integer_ctypes;
        if (!(spec & MOD_LONGLONG)) {
                ctype++;
                if (!(spec & MOD_LONG)) {
                        ctype++;
                        if (!(spec & MOD_SHORT)) {
                                ctype++;
                                if (!(spec & MOD_CHAR))
                                        ctype++;
                        }
                }
        }

        sub = ((spec & MOD_UNSIGNED)
               ? 2
               : ((spec & MOD_EXPLICITLY_SIGNED)
                  ? 1
                  : 0));

        return ctype[0][sub];
}

struct symbol * ctype_fp(unsigned long spec)
{
        if (spec & MOD_LONGLONG)
                return &ldouble_ctype;
        if (spec & MOD_LONG)
                return &double_ctype;
        return &float_ctype;
}

static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
{
        unsigned long mod = thistype->modifiers;

        if (mod) {
                unsigned long old = ctype->modifiers;
                unsigned long extra = 0, dup, conflict;

                if (mod & old & MOD_LONG) {
                        extra = MOD_LONGLONG | MOD_LONG;
                        mod &= ~MOD_LONG;
                        old &= ~MOD_LONG;
                }
                dup = (mod & old) | (extra & old) | (extra & mod);
                if (dup)
                        warning(pos, "Just how %sdo you want this type to be?",
                                modifier_string(dup));

                conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
                if (conflict)
                        warning(pos, "You cannot have both long and short modifiers.");

                conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
                if (conflict)
                        warning(pos, "You cannot have both signed and unsigned modifiers.");

                // Only one storage modifier allowed, except that "inline" doesn't count.
                conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
                conflict &= (conflict - 1);
                if (conflict)
                        warning(pos, "multiple storage classes");

                ctype->modifiers = old | mod | extra;
        }

        /* Context mask and value */
        if ((ctype->context ^ thistype->context) & (ctype->contextmask & thistype->contextmask)) {
                warning(pos, "inconsistent attribute types");
                thistype->context = 0;
                thistype->contextmask = 0;
        }
        ctype->context |= thistype->context;
        ctype->contextmask |= thistype->contextmask;

        /* Alignment */
        if (thistype->alignment & (thistype->alignment-1)) {
                warning(pos, "I don't like non-power-of-2 alignments");
                thistype->alignment = 0;
        }
        if (thistype->alignment > ctype->alignment)
                ctype->alignment = thistype->alignment;

        /* Address space */
        ctype->as = thistype->as;
}

static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
{
        unsigned long banned, wrong;
        unsigned long this_mod = s->ctype.modifiers;
        const unsigned long BANNED_SIZE = MOD_LONG | MOD_LONGLONG | MOD_SHORT;
        const unsigned long BANNED_SIGN = MOD_SIGNED | MOD_UNSIGNED;

        if (this_mod & (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF))
                banned = BANNED_SIZE | BANNED_SIGN;
        else if (this_mod & MOD_SPECIALBITS)
                banned = 0;
        else if (s->ctype.base_type == &fp_type)
                banned = BANNED_SIGN;
        else if (s->ctype.base_type == &int_type || !s->ctype.base_type || is_int_type (s))
                banned = 0;
        else {
                // label_type
                // void_type
                // bad_type
                // vector_type <-- whatever that is
                banned = BANNED_SIZE | BANNED_SIGN;
        }

        wrong = mod & banned;
        if (wrong)
                warning(*pos, "modifier %sis invalid in this context",
                     modifier_string (wrong));
}


static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
{
        struct token *token;

        while ( (token = next) != NULL ) {
                struct ctype thistype;
                struct ident *ident;
                struct symbol *s, *type;
                unsigned long mod;

                next = token->next;
                if (token_type(token) != TOKEN_IDENT)
                        break;
                ident = token->ident;

                s = lookup_symbol(ident, NS_TYPEDEF);
                if (!s)
                        break;
                thistype = s->ctype;
                mod = thistype.modifiers;
                if (qual && (mod & ~(MOD_ATTRIBUTE | MOD_CONST | MOD_VOLATILE)))
                        break;
                if (mod & MOD_SPECIALBITS) {
                        if (mod & MOD_STRUCTOF)
                                next = struct_or_union_specifier(SYM_STRUCT, next, &thistype);
                        else if (mod & MOD_UNIONOF)
                                next = struct_or_union_specifier(SYM_UNION, next, &thistype);
                        else if (mod & MOD_ENUMOF)
                                next = enum_specifier(next, &thistype);
                        else if (mod & MOD_ATTRIBUTE)
                                next = attribute_specifier(next, &thistype);
                        else if (mod & MOD_TYPEOF)
                                next = typeof_specifier(next, &thistype);
                        mod = thistype.modifiers;
                }
                type = thistype.base_type;
                if (type) {
                        if (qual)
                                break;
                        if (ctype->base_type)
                                break;
                        /* User types only mix with qualifiers */
                        if (mod & MOD_USERTYPE) {
                                if (ctype->modifiers & MOD_SPECIFIER)
                                        break;
                        }
                        ctype->base_type = type;
                }

                check_modifiers(&token->pos, s, ctype->modifiers);
                apply_ctype(token->pos, &thistype, ctype);
        }

        /* Turn the "virtual types" into real types with real sizes etc */
        if (!ctype->base_type) {
                struct symbol *base = &incomplete_ctype;

                /*
                 * If we have modifiers, we'll default to an integer
                 * type, and "ctype_integer()" will turn this into
                 * a specific one.
                 */
                if (ctype->modifiers & MOD_SPECIFIER)
                        base = &int_type;
                ctype->base_type = base;
        }
        if (ctype->base_type == &int_type) {
                ctype->base_type = ctype_integer(ctype->modifiers);
                ctype->modifiers &= ~MOD_SPECIFIER;
        } else if (ctype->base_type == &fp_type) {
                ctype->base_type = ctype_fp(ctype->modifiers);
                ctype->modifiers &= ~MOD_SPECIFIER;
        }
        if (ctype->modifiers & MOD_BITWISE) {
                struct symbol *type;
                ctype->modifiers &= ~(MOD_BITWISE | MOD_SPECIFIER);
                if (!is_int_type(ctype->base_type)) {
                        warning(token->pos, "invalid modifier");
                        return token;
                }
                type = alloc_symbol(token->pos, SYM_BASETYPE);
                *type = *ctype->base_type;
                type->ctype.base_type = ctype->base_type;
                type->type = SYM_RESTRICT;
                type->ctype.modifiers &= ~MOD_SPECIFIER;
                ctype->base_type = type;
        }
        return token;
}

static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
{
        struct expression *expr = NULL;

        token = parse_expression(token, &expr);
        sym->array_size = expr;
        return token;
}

static struct token *parameter_type_list(struct token *, struct symbol *);
static struct token *declarator(struct token *token, struct symbol **tree, struct ident **p);

static struct token *handle_attributes(struct token *token, struct ctype *ctype)
{
        while (match_idents(token, &__attribute___ident, &__attribute_ident, NULL)) {
                struct ctype thistype = { 0, };
                token = attribute_specifier(token->next, &thistype);
                apply_ctype(token->pos, &thistype, ctype);
        }
        return token;
}

static struct token *direct_declarator(struct token *token, struct symbol **tree, struct ident **p)
{
        struct ctype *ctype = &(*tree)->ctype;

        if (p && token_type(token) == TOKEN_IDENT) {
                *p = token->ident;
                token = token->next;
        }

        for (;;) {
                token = handle_attributes(token, ctype);

                if (token_type(token) != TOKEN_SPECIAL)
                        return token;

                /*
                 * 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.
                 */
                if (token->special == '(') {
                        struct symbol *sym;
                        struct token *next = token->next;
                        int fn = (p && *p) || match_op(next, ')') || lookup_type(next);

                        if (!fn) {
                                struct symbol *base_type = ctype->base_type;
                                token = declarator(next, tree, p);
                                token = expect(token, ')', "in nested declarator");
                                while (ctype->base_type != base_type)
                                        ctype = &ctype->base_type->ctype;
                                p = NULL;
                                continue;
                        }

                        sym = indirect(token->pos, ctype, SYM_FN);
                        token = parameter_type_list(next, sym);
                        token = expect(token, ')', "in function declarator");
                        continue;
                }
                if (token->special == '[') {
                        struct symbol *array = indirect(token->pos, ctype, SYM_ARRAY);
                        token = abstract_array_declarator(token->next, array);
                        token = expect(token, ']', "in abstract_array_declarator");
                        ctype = &array->ctype;
                        continue;
                }
                break;
        }
        if (p) {
                (*tree)->ident = *p;
        }
        return token;
}

static struct token *pointer(struct token *token, struct ctype *ctype)
{
        unsigned long modifiers;
        struct symbol *base_type;

        modifiers = ctype->modifiers & ~(MOD_TYPEDEF | MOD_ATTRIBUTE);
        base_type = ctype->base_type;
        ctype->modifiers = modifiers;
        
        while (match_op(token,'*')) {
                struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
                ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
                ptr->ctype.as = ctype->as;
                ptr->ctype.context = ctype->context;
                ptr->ctype.contextmask = ctype->contextmask;
                ptr->ctype.base_type = base_type;

                base_type = ptr;
                ctype->modifiers = modifiers & MOD_STORAGE;
                ctype->base_type = base_type;
                ctype->as = 0;
                ctype->context = 0;
                ctype->contextmask = 0;

                token = declaration_specifiers(token->next, ctype, 1);
                modifiers = ctype->modifiers;
        }
        return token;
}

static struct token *declarator(struct token *token, struct symbol **tree, struct ident **p)
{
        token = pointer(token, &(*tree)->ctype);
        return direct_declarator(token, tree, p);
}

static struct token *handle_bitfield(struct token *token, struct symbol *decl)
{
        struct ctype *ctype = &decl->ctype;
        struct expression *expr;
        struct symbol *bitfield;
        long long width;

        if (!is_int_type(ctype->base_type)) {
                warning(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 = indirect(token->pos, ctype, SYM_BITFIELD);
        token = conditional_expression(token->next, &expr);
        width = get_expression_value(expr);
        bitfield->fieldwidth = width;

        if (width < 0) {
                warning(token->pos, "invalid negative bitfield width, %lld.", width);
                bitfield->fieldwidth = 8;
        } else if (decl->ident && width == 0) {
                warning(token->pos, "invalid named zero-width bitfield `%s'",
                     show_ident(decl->ident));
                bitfield->fieldwidth = 8;
        } else if (width != bitfield->fieldwidth) {
                // Overflow.
                unsigned int stupid_gcc = -1;
                bitfield->fieldwidth = stupid_gcc;
                warning(token->pos, "truncating large bitfield from %lld to %d bits", width, bitfield->fieldwidth);
        } else if (decl->ident) {
                struct symbol *base_type = bitfield->ctype.base_type;
                int is_signed = !(base_type->ctype.modifiers & MOD_UNSIGNED);
                if (bitfield->fieldwidth == 1 && is_signed) {
                        // Valid values are either {-1;0} or {0}, depending on integer
                        // representation.  The latter makes for very efficient code...
                        warning(token->pos, "dubious one-bit signed bitfield");
                }
                if (Wdefault_bitfield_sign &&
                    base_type->type != SYM_ENUM &&
                    !(base_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'");
                }
        }
        return token;
}

static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
{
        while (!match_op(token, '}')) {
                struct ctype ctype = {0, };
        
                token = declaration_specifiers(token, &ctype, 0);
                for (;;) {
                        struct ident *ident = NULL;
                        struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
                        decl->ctype = ctype;
                        token = declarator(token, &decl, &ident);
                        if (match_op(token, ':')) {
                                token = handle_bitfield(token, decl);
                                token = handle_attributes(token, &decl->ctype);
                        }
                        add_symbol(list, decl);
                        if (!match_op(token, ','))
                                break;
                        token = token->next;
                }
                if (!match_op(token, ';')) {
                        warning(token->pos, "expected ; at end of declaration");
                        break;
                }
                token = token->next;
        }
        return token;
}

static struct token *parameter_declaration(struct token *token, struct symbol **tree)
{
        struct ident *ident = NULL;
        struct symbol *sym;
        struct ctype ctype = { 0, };

        token = declaration_specifiers(token, &ctype, 0);
        sym = alloc_symbol(token->pos, SYM_NODE);
        sym->ctype = ctype;
        *tree = sym;
        token = declarator(token, tree, &ident);
        return token;
}

struct token *typename(struct token *token, struct symbol **p)
{
        struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
        *p = sym;
        token = declaration_specifiers(token, &sym->ctype, 0);
        return declarator(token, &sym, NULL);
}

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 expression *expr;

        /* Allow empty operands */
        if (match_op(token->next, ':') || match_op(token->next, ')'))
                return token->next;
        do {
                if (match_op(token->next, '[') &&
                    token_type(token->next->next) == TOKEN_IDENT &&
                    match_op(token->next->next->next, ']'))
                        token = token->next->next->next;
                token = primary_expression(token->next, &expr);
                token = parens_expression(token, &expr, "in asm parameter");
        } while (match_op(token, ','));
        return token;
}

static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt)
{
        struct expression *expr;

        do {
                token = primary_expression(token->next, &expr);
        } while (match_op(token, ','));
        return token;
}

static struct token *parse_asm(struct token *token, struct statement *stmt)
{
        struct expression *expr;

        stmt->type = STMT_ASM;
        if (match_idents(token, &__volatile___ident, &volatile_ident, NULL)) {
                token = token->next;
        }
        token = expect(token, '(', "after asm");
        token = parse_expression(token->next, &expr);
        if (match_op(token, ':'))
                token = parse_asm_operands(token, stmt);
        if (match_op(token, ':'))
                token = parse_asm_operands(token, stmt);
        if (match_op(token, ':'))
                token = parse_asm_clobbers(token, stmt);
        token = expect(token, ')', "after asm");
        return expect(token, ';', "at end of asm-statement");
}

/* 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_symbol_scope();
        cont = alloc_symbol(stmt->pos, SYM_NODE);
        cont->ident = &continue_ident;
        bind_symbol(cont, &continue_ident, NS_ITERATOR);
        brk = alloc_symbol(stmt->pos, SYM_NODE);
        brk->ident = &break_ident;
        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_symbol_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->ident = &return_ident;
        ret->ctype = sym->ctype.base_type->ctype;
        ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
        ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
        bind_symbol(ret, &return_ident, NS_ITERATOR);
        stmt->ret = ret;
        fn_local_symbol(ret);

        // static const char __func__[] = "function-name";
        if (sym->ident) {
                struct symbol *funcname = alloc_symbol(sym->pos, SYM_NODE);
                struct symbol *array = alloc_symbol(sym->pos, SYM_ARRAY);
                struct expression *expr = alloc_expression(sym->pos, EXPR_STRING);
                int len = sym->ident->len;
                struct string *string = __alloc_string(len+1);

                array->ctype.base_type = &char_ctype;
                array->ctype.modifiers = MOD_CONST | MOD_STATIC;
          
                memcpy(string->data, sym->ident->name, len);
                string->data[len] = '\0';
                string->length = len + 1;

                expr->string = string;

                funcname->initializer = expr;
                funcname->ctype.modifiers = array->ctype.modifiers;
                funcname->ctype.base_type = array;
                funcname->ident = &__func___ident;
                bind_symbol(funcname, &__func___ident, NS_SYMBOL);

                add_symbol(&stmt->syms, funcname);
                fn_local_symbol(funcname);
        }

        return stmt;
}

static void end_function(struct symbol *sym)
{
        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_symbol_scope();
        brk = alloc_symbol(stmt->pos, SYM_NODE);
        brk->ident = &break_ident;
        bind_symbol(brk, &break_ident, NS_ITERATOR);

        switch_case = alloc_symbol(stmt->pos, SYM_NODE);
        switch_case->ident = &case_ident;
        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_symbol_scope();
}

static void add_case_statement(struct statement *stmt)
{
        struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
        struct symbol *sym;

        if (!target) {
                warning(stmt->pos, "not in switch scope");
                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 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);
        } 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 = e2;
        stmt->iterator_statement = iterator;
        end_iterator(stmt);

        return token;
}

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 = expr;
        stmt->iterator_statement = iterator;
        end_iterator(stmt);

        return token;
}

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
                warning(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);

        return expect(token, ';', "after statement");
}

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) {
                if (token->ident == &if_ident) {
                        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);
                }

                if (token->ident == &return_ident)
                        return parse_return_statement(token, stmt);

                if (token->ident == &break_ident || token->ident == &continue_ident) {
                        struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
                        stmt->type = STMT_GOTO;
                        stmt->goto_label = target;
                        if (!target)
                                warning(stmt->pos, "break/continue not in iterator scope");
                        return expect(token->next, ';', "at end of statement");
                }
                if (token->ident == &default_ident) {
                        token = token->next;
                        goto default_statement;
                }
                if (token->ident == &case_ident) {
                        token = parse_expression(token->next, &stmt->case_expression);
                        if (match_op(token, SPECIAL_ELLIPSIS))
                                token = parse_expression(token->next, &stmt->case_to);
default_statement:
                        stmt->type = STMT_CASE;
                        token = expect(token, ':', "after default/case");
                        add_case_statement(stmt);
                        return statement(token, &stmt->case_statement);
                }
                if (token->ident == &switch_ident) {
                        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;
                }
                if (token->ident == &for_ident)
                        return parse_for_statement(token, stmt);

                if (token->ident == &while_ident)
                        return parse_while_statement(token, stmt);

                if (token->ident == &do_ident)
                        return parse_do_statement(token, stmt);

                if (token->ident == &goto_ident) {
                        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) {
                                stmt->goto_label = label_symbol(token);
                                token = token->next;
                        } else {
                                warning(token->pos, "Expected identifier or goto expression");
                        }
                        return expect(token, ';', "at end of statement");
                }
                if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
                        return parse_asm(token->next, stmt);
                }
                if (match_op(token->next, ':')) {
                        stmt->type = STMT_LABEL;
                        stmt->label_identifier = label_symbol(token);
                        return statement(token->next->next, &stmt->label_statement);
                }
        }

        if (match_op(token, '{')) {
                stmt->type = STMT_COMPOUND;
                start_symbol_scope();
                token = compound_statement(token->next, stmt);
                end_symbol_scope();
                
                return expect(token, '}', "at end of compound statement");
        }
                        
        stmt->type = STMT_EXPRESSION;
        return expression_statement(token, &stmt->expression);
}

struct token * statement_list(struct token *token, struct statement_list **list)
{
        for (;;) {
                struct statement * stmt;
                if (eof_token(token))
                        break;
                if (match_op(token, '}'))
                        break;
                token = statement(token, &stmt);
                add_statement(list, stmt);
        }
        return token;
}

static struct token *parameter_type_list(struct token *token, struct symbol *fn)
{
        struct symbol_list **list = &fn->arguments;

        if (match_op(token, ')')) {
                // No warning for "void oink ();"
                // Bug or feature: warns for "void oink () __attribute__ ((noreturn));"
                if (!match_op(token->next, ';'))
                        warning(token->pos, "non-ANSI function declaration");
                return token;
        }

        for (;;) {
                struct symbol *sym;

                if (match_op(token, SPECIAL_ELLIPSIS)) {
                        if (!*list)
                                warning(token->pos, "variadic functions must have one named argument");
                        fn->variadic = 1;
                        token = token->next;
                        break;
                }

                sym = alloc_symbol(token->pos, SYM_NODE);
                token = parameter_declaration(token, &sym);
                if (sym->ctype.base_type == &void_ctype) {
                        /* Special case: (void) */
                        if (!*list && !sym->ident)
                                break;
                        warning(token->pos, "void parameter");
                }
                add_symbol(list, sym);
                if (!match_op(token, ','))
                        break;
                token = token->next;

        }
        return token;
}

struct token *compound_statement(struct token *token, struct statement *stmt)
{
        while (!eof_token(token)) {
                if (!lookup_type(token))
                        break;
                token = external_declaration(token, &stmt->syms);
        }
        token = statement_list(token, &stmt->stmts);
        return token;
}

static struct expression *identifier_expression(struct token *token)
{
        struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
        expr->expr_ident = token->ident;
        return expr;
}

static struct expression *index_expression(struct expression *from, struct expression *to)
{
        int idx_from, idx_to;
        struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);

        idx_from = get_expression_value(from);
        idx_to = idx_from;
        if (to) {
                idx_to = get_expression_value(to);
                if (idx_to < idx_from || idx_from < 0)
                        warning(from->pos, "nonsense array initializer index range");
        }
        expr->idx_from = idx_from;
        expr->idx_to = idx_to;
        return expr;
}

static struct token *initializer_list(struct expression_list **list, struct token *token)
{
        for (;;) {
                struct token *next = token->next;
                struct expression *expr;

                if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT) && match_op(next->next, '=')) {
                        add_expression(list, identifier_expression(next));
                        token = next->next->next;
                } else if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
                        add_expression(list, identifier_expression(token));
                        token = next->next;
                } else if (match_op(token, '[')) {
                        struct expression *from = NULL, *to = NULL;
                        token = constant_expression(token->next, &from);
                        if (match_op(token, SPECIAL_ELLIPSIS))
                                token = constant_expression(token->next, &to);
                        add_expression(list, index_expression(from, to));
                        token = expect(token, ']', "at end of initializer index");
                        token = expect(token, '=', "at end of initializer index");
                }

                expr = NULL;
                token = initializer(&expr, token);
                if (!expr)
                        break;
                add_expression(list, expr);
                if (!match_op(token, ','))
                        break;
                token = token->next;
        }
        return token;
}

struct token *initializer(struct expression **tree, struct token *token)
{
        if (match_op(token, '{')) {
                struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
                *tree = expr;
                token = initializer_list(&expr->expr_list, token->next);
                return expect(token, '}', "at end of initializer");
        }
        return assignment_expression(token, tree);
}

static void declare_argument(struct symbol *sym, struct symbol *fn)
{
        if (!sym->ident) {
                warning(sym->pos, "no identifier for function argument");
                return;
        }
        bind_symbol(sym, sym->ident, NS_SYMBOL);
}

static struct token *parse_function_body(struct token *token, struct symbol *decl,
        struct symbol_list **list)
{
        struct symbol *base_type = decl->ctype.base_type;
        struct statement *stmt, **p;
        struct symbol *arg;

        if (decl->ctype.modifiers & MOD_INLINE) {
                function_symbol_list = &decl->inline_symbol_list;
                p = &base_type->inline_stmt;
        } else {
                function_symbol_list = &decl->symbol_list;
                p = &base_type->stmt;
        }
        function_computed_target_list = NULL;
        function_computed_goto_list = NULL;

        if (decl->ctype.modifiers & MOD_EXTERN) {
                if (!(decl->ctype.modifiers & MOD_INLINE))
                        warning(decl->pos, "function with external linkage has definition");
        }
        if (!(decl->ctype.modifiers & MOD_STATIC))
                decl->ctype.modifiers |= MOD_EXTERN;

        stmt = start_function(decl);

        *p = stmt;
        FOR_EACH_PTR (base_type->arguments, arg) {
                declare_argument(arg, base_type);
        } END_FOR_EACH_PTR(arg);

        token = compound_statement(token->next, stmt);

        end_function(decl);
        if (!(decl->ctype.modifiers & MOD_INLINE))
                add_symbol(list, decl);
        check_declaration(decl);
        function_symbol_list = NULL;
        if (function_computed_goto_list) {
                if (!function_computed_target_list)
                        warning(decl->pos, "function has computed goto but no targets?");
                else {
                        struct statement *stmt;
                        FOR_EACH_PTR(function_computed_goto_list, stmt) {
                                stmt->target_list = function_computed_target_list;
                        } END_FOR_EACH_PTR(stmt);
                }
        }
        return expect(token, '}', "at end of function");
}

static void promote_k_r_types(struct symbol *arg)
{
        struct symbol *base = arg->ctype.base_type;
        if (base && base->ctype.base_type == &int_type && (base->ctype.modifiers & (MOD_CHAR | MOD_SHORT))) {
                arg->ctype.base_type = &int_ctype;
        }
}

static void apply_k_r_types(struct symbol_list *argtypes, struct symbol *fn)
{
        struct symbol_list *real_args = fn->ctype.base_type->arguments;
        struct symbol *arg;

        FOR_EACH_PTR(real_args, arg) {
                struct symbol *type;

                /* This is quadratic in the number of arguments. We _really_ don't care */
                FOR_EACH_PTR(argtypes, type) {
                        if (type->ident == arg->ident)
                                goto match;
                } END_FOR_EACH_PTR(type);
                warning(arg->pos, "missing type declaration for parameter '%s'", show_ident(arg->ident));
                continue;
match:
                type->used = 1;
                /* "char" and "short" promote to "int" */
                promote_k_r_types(type);

                arg->ctype = type->ctype;
        } END_FOR_EACH_PTR(arg);

        FOR_EACH_PTR(argtypes, arg) {
                if (!arg->used)
                        warning(arg->pos, "nonsensical parameter declaration '%s'", show_ident(arg->ident));
        } END_FOR_EACH_PTR(arg);

}

static struct token *parse_k_r_arguments(struct token *token, struct symbol *decl,
        struct symbol_list **list)
{
        struct symbol_list *args = NULL;

        warning(token->pos, "non-ANSI function declaration");
        do {
                token = external_declaration(token, &args);
        } while (lookup_type(token));

        apply_k_r_types(args, decl);

        if (!match_op(token, '{')) {
                warning(token->pos, "expected function body");
                return token;
        }
        return parse_function_body(token, decl, list);
}


static struct token *external_declaration(struct token *token, struct symbol_list **list)
{
        struct ident *ident = NULL;
        struct symbol *decl;
        struct ctype ctype = { 0, };
        struct symbol *base_type;
        int is_typedef;

        /* Top-level inline asm? */
        if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
                struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
                struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
                struct statement *stmt;

                anon->ctype.base_type = fn;
                function_symbol_list = &anon->symbol_list;
                stmt = start_function(anon);
                token = parse_asm(token->next, stmt);
                end_function(anon);
                function_symbol_list = NULL;
                add_symbol(list, anon);
                return token;
        }

        /* Parse declaration-specifiers, if any */
        token = declaration_specifiers(token, &ctype, 0);
        decl = alloc_symbol(token->pos, SYM_NODE);
        decl->ctype = ctype;
        token = declarator(token, &decl, &ident);

        /* Just a type declaration? */
        if (!ident)
                return expect(token, ';', "end of type declaration");

        decl->ident = ident;

        /* type define declaration? */
        is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;

        /* Typedef's don't have meaningful storage */
        if (is_typedef) {
                ctype.modifiers &= ~MOD_STORAGE;
                decl->ctype.modifiers &= ~MOD_STORAGE;
                decl->ctype.modifiers |= MOD_USERTYPE;
        }

        bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);

        base_type = decl->ctype.base_type;
        if (!is_typedef && base_type && base_type->type == SYM_FN) {
                /* K&R argument declaration? */
                if (lookup_type(token))
                        return parse_k_r_arguments(token, decl, list);
                if (match_op(token, '{'))
                        return parse_function_body(token, decl, list);

                if (!(decl->ctype.modifiers & MOD_STATIC))
                        decl->ctype.modifiers |= MOD_EXTERN;
        } else if (!is_typedef && base_type == &void_ctype && !(decl->ctype.modifiers & MOD_EXTERN)) {
                warning(token->pos, "void declaration");
        }

        for (;;) {
                if (token_type(token) == TOKEN_IDENT) {
                        if (token->ident ==  &asm_ident || token->ident == &__asm_ident || token->ident == &__asm___ident) {
                                struct expression *expr;

                                token = expect(token->next, '(', "after asm");
                                token = parse_expression(token->next, &expr);
                                token = expect(token, ')', "after asm");
                        }
                }
                if (!is_typedef && match_op(token, '=')) {
                        if (decl->ctype.modifiers & MOD_EXTERN) {
                                warning(decl->pos, "symbol with external linkage has initializer");
                                decl->ctype.modifiers &= ~MOD_EXTERN;
                        }
                        token = initializer(&decl->initializer, token->next);
                }
                if (!is_typedef) {
                        if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
                                add_symbol(list, decl);
                                if (function_symbol_list)
                                        fn_local_symbol(decl);
                        }
                }
                check_declaration(decl);

                if (!match_op(token, ','))
                        break;

                token = token->next;
                ident = NULL;
                decl = alloc_symbol(token->pos, SYM_NODE);
                decl->ctype = ctype;
                token = declaration_specifiers(token, &decl->ctype, 1);
                token = declarator(token, &decl, &ident);
                if (!ident) {
                        warning(token->pos, "expected identifier name in type definition");
                        return token;
                }

                bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);

                /* Function declarations are automatically extern unless specifically static */
                base_type = decl->ctype.base_type;
                if (!is_typedef && base_type && base_type->type == SYM_FN) {
                        if (!(decl->ctype.modifiers & MOD_STATIC))
                                decl->ctype.modifiers |= MOD_EXTERN;
                }
        }
        return expect(token, ';', "at end of declaration");
}

void translation_unit(struct token *token, struct symbol_list **list)
{
        while (!eof_token(token))
                token = external_declaration(token, list);
        // They aren't needed any more
        clear_token_alloc();
}