%code top {
/*
* Parser for C declarations.
- * Copyright © 2011 Nick Bowler
+ * Copyright © 2011-2012, 2021, 2023 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
}
%name-prefix "cdecl__yy"
-%parse-param {yyscan_t scanner}
+%parse-param {void *scanner}
%parse-param {struct cdecl **out}
%lex-param {yyscan_t scanner}
%define api.pure
%locations
%{
+#include <config.h>
#include <assert.h>
#include <stdbool.h>
#include "scan.h"
#include "cdecl.h"
+#include "cdecl-internal.h"
+#include "errmsg.h"
#define FAIL(msg) do { \
yyerror(&yylloc, NULL, NULL, msg); \
#define ALLOC(ptr, size) do { \
(ptr) = malloc(size); \
- if (!(ptr)) \
- FAIL("failed to allocate memory"); \
+ if (!(ptr)) { \
+ cdecl__errmsg(CDECL__ENOMEM); \
+ YYERROR; \
+ } \
} while (0)
#define ALLOC_STRUCT(ptr, type, ...) do { \
}
%code provides {
-void cdecl__yyerror(YYLTYPE *, void *, struct cdecl **, const char *);
+void cdecl__free(struct cdecl *);
int cdecl__yyparse(void *scanner, struct cdecl **out);
+const char *cdecl__token_name(unsigned token);
}
%union {
uintmax_t uintval;
+ unsigned spectype;
_Bool boolval;
char *strval;
struct cdecl_declspec *declspec;
}
%{
+static void yyerror(YYLTYPE *, yyscan_t, struct cdecl **, const char *);
static void free_decl(struct cdecl *);
static void free_declspec(struct cdecl_declspec *x)
}
}
-void cdecl_free(struct cdecl *decl)
+void cdecl__free(struct cdecl *decl)
{
free_decl(decl);
}
+
+/*
+ * Join two declaration specifier lists into a single list, with "a" being the
+ * head of the new list.
+ *
+ * The list "a" is assumed to be nonempty.
+ */
+static void join_specs(struct cdecl_declspec *a, struct cdecl_declspec *b)
+{
+ while (a->next)
+ a = a->next;
+ a->next = b;
+}
+
+/*
+ * Alter an abstract declarator (type name) to declare an identifier instead,
+ * used by the English parser rules to reduce "identifier as type" sequences.
+ */
+static struct cdecl *insert_identifier(struct cdecl *decl, char *ident)
+{
+ struct cdecl_declarator *d = decl->declarators;
+
+ while (d->child)
+ d = d->child;
+
+ d->type = CDECL_DECL_IDENT;
+ d->u.ident = ident;
+
+ return decl;
+}
%}
%destructor { free($$); } <strval>
%token T_COMMA ","
%token T_ELLIPSIS "..."
-%token T_TYPEDEF "typedef"
-%token T_EXTERN "extern"
-%token T_STATIC "static"
-%token T_AUTO "auto"
-%token T_REGISTER "register"
-
-%token T_INLINE "inline"
-
-%token T_RESTRICT "restrict"
-%token T_VOLATILE "volatile"
-%token T_CONST "const"
-
-%token T_VOID "void"
-%token T_CHAR "char"
-%token T_SHORT "short"
-%token T_INT "int"
-%token T_LONG "long"
-%token T_FLOAT "float"
-%token T_DOUBLE "double"
-%token T_SIGNED "signed"
-%token T_UNSIGNED "unsigned"
-%token T_BOOL "_Bool"
-%token T_COMPLEX "_Complex"
-%token T_IMAGINARY "_Imaginary"
-
-%token T_STRUCT "struct"
-%token T_UNION "union"
-%token T_ENUM "enum"
+%token <spectype> T_TYPEDEF "typedef"
+%token <spectype> T_EXTERN "extern"
+%token <spectype> T_STATIC "static"
+%token <spectype> T_AUTO "auto"
+%token <spectype> T_REGISTER "register"
+
+%token <spectype> T_INLINE "inline"
+
+%token <spectype> T_RESTRICT "restrict"
+%token <spectype> T_VOLATILE "volatile"
+%token <spectype> T_CONST "const"
+
+%token <spectype> T_VOID "void"
+%token <spectype> T_CHAR "char"
+%token <spectype> T_SHORT "short"
+%token <spectype> T_INT "int"
+%token <spectype> T_LONG "long"
+%token <spectype> T_FLOAT "float"
+%token <spectype> T_DOUBLE "double"
+%token <spectype> T_SIGNED "signed"
+%token <spectype> T_UNSIGNED "unsigned"
+%token <spectype> T_BOOL "_Bool"
+%token <spectype> T_COMPLEX "_Complex"
+%token <spectype> T_IMAGINARY "_Imaginary"
+
+%token <spectype> T_STRUCT "struct"
+%token <spectype> T_UNION "union"
+%token <spectype> T_ENUM "enum"
/*
* English keywords.
%token T_VLA "variable-length"
%type <strval> vla_ident
+%type <uintval> array_length
%type <boolval> varargs
-%type <uintval> declspec_simple typespec_simple qualifier_simple
+%type <spectype> declspec_simple qualifier_simple
+%type <spectype> typespec_simple typespec_tagged
%type <declspec> declspec_notype declspec_noid typespec_noid typespec
%type <declspec> qualifier qualifiers
%type <declspec> declspecs declspecs_noid
%type <declarator> direct_declarator declarator pointer array parens postfix
%type <declarator> direct_declarator_ish declarator_ish parameter_type_list
%type <decl> declaration declarators declarator_wrap
-%type <decl> parameter parameters
+%type <decl> parameter
%type <strval> english_vla
%type <declspec> storage_func_specs post_specs
%type <declspec> type_qual_spec type_qual_specs typedef_name_qual
%type <declarator> english_declarator english_array english_function
%type <declarator> english_parameter_list null_decl
-%type <decl> english_parameter english_parameters
%type <decl> english english_declaration
+%type <decl> english_parameter
/*
* Harmless shift/reduce conflicts in english_parameter. See comments below
*out = $1;
};
-declaration: declspecs declarators T_SEMICOLON {
- $$ = $2;
+semi: | T_SEMICOLON
- for (struct cdecl *i = $$; i; i = i->next)
- i->specifiers = $1;
+declaration: declspecs declarators semi {
+ $$ = $2;
+ $$->specifiers = $1;
};
+/*
+ * We support parsing declarations using arbitrary identifiers as type
+ * specifiers (a la C typedef). To avoid confusion with identifiers that
+ * may also be used as declarators, note the following:
+ *
+ * (a) Every valid C declaration must have at least one type specifier, and
+ * (b) Valid declarations with typedef names have exactly one type specifier.
+ *
+ * So the rule applied when parsing specifiers is: an identifier is a type
+ * specifier only if we have not yet seen any type specifiers whatsoever
+ * (within one declaration specifier list).
+ *
+ * Treating identifiers as type specifiers by default can lead to strange and
+ * unexpected parses; libcdecl applies a simplification step to the resulting
+ * parse tree afterwards.
+ */
declspecs: declspec_notype declspecs {
$$ = $1;
$$->next = $2;
ALLOC_STRUCT($$, struct cdecl, .declarators = $1);
}
-declspec_simple: T_AUTO { $$ = CDECL_STOR_AUTO; }
- | T_TYPEDEF { $$ = CDECL_STOR_TYPEDEF; }
- | T_EXTERN { $$ = CDECL_STOR_EXTERN; }
- | T_STATIC { $$ = CDECL_STOR_STATIC; }
- | T_REGISTER { $$ = CDECL_STOR_REGISTER; }
- | T_INLINE { $$ = CDECL_FUNC_INLINE; }
-
-typespec_simple: T_VOID { $$ = CDECL_TYPE_VOID; }
- | T_CHAR { $$ = CDECL_TYPE_CHAR; }
- | T_SHORT { $$ = CDECL_TYPE_SHORT; }
- | T_INT { $$ = CDECL_TYPE_INT; }
- | T_LONG { $$ = CDECL_TYPE_LONG; }
- | T_FLOAT { $$ = CDECL_TYPE_FLOAT; }
- | T_DOUBLE { $$ = CDECL_TYPE_DOUBLE; }
- | T_SIGNED { $$ = CDECL_TYPE_SIGNED; }
- | T_UNSIGNED { $$ = CDECL_TYPE_UNSIGNED; }
- | T_BOOL { $$ = CDECL_TYPE_BOOL; }
- | T_COMPLEX { $$ = CDECL_TYPE_COMPLEX; }
- | T_IMAGINARY { $$ = CDECL_TYPE_IMAGINARY; }
-
-qualifier_simple: T_CONST { $$ = CDECL_QUAL_CONST; }
- | T_RESTRICT { $$ = CDECL_QUAL_RESTRICT; }
- | T_VOLATILE { $$ = CDECL_QUAL_VOLATILE; }
+declspec_simple: T_AUTO
+ | T_TYPEDEF
+ | T_EXTERN
+ | T_STATIC
+ | T_REGISTER
+ | T_INLINE
+
+typespec_simple: T_VOID
+ | T_CHAR
+ | T_SHORT
+ | T_INT
+ | T_LONG
+ | T_FLOAT
+ | T_DOUBLE
+ | T_SIGNED
+ | T_UNSIGNED
+ | T_BOOL
+ | T_COMPLEX
+ | T_IMAGINARY
+
+typespec_tagged: T_STRUCT | T_UNION | T_ENUM
+
+qualifier_simple: T_CONST
+ | T_RESTRICT
+ | T_VOLATILE
declspec_notype: qualifier | declspec_simple {
ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
ALLOC_STRUCT($$, struct cdecl_declspec, .type = $1);
}
-typespec: typespec_noid | T_STRUCT T_IDENT {
+typespec: typespec_noid | typespec_tagged T_IDENT {
ALLOC_STRUCT($$, struct cdecl_declspec,
- .type = CDECL_TYPE_STRUCT,
- .ident = $2);
-} | T_UNION T_IDENT {
- ALLOC_STRUCT($$, struct cdecl_declspec,
- .type = CDECL_TYPE_UNION,
- .ident = $2);
-} | T_ENUM T_IDENT {
- ALLOC_STRUCT($$, struct cdecl_declspec,
- .type = CDECL_TYPE_ENUM,
+ .type = $1,
.ident = $2);
} | T_IDENT {
ALLOC_STRUCT($$, struct cdecl_declspec,
strcpy($$, "");
}
-array: T_LBRACKET T_UINT T_RBRACKET {
- if ($2 == 0)
- FAIL("array length must be positive");
-
+array: T_LBRACKET array_length T_RBRACKET {
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_ARRAY,
.u.array.length = $2);
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_ARRAY,
.u.array.vla = $2);
-} | T_LBRACKET T_RBRACKET {
- ALLOC_STRUCT($$, struct cdecl_declarator,
- .type = CDECL_DECL_ARRAY);
}
parameter: declspecs declarator {
.declarators = $2);
}
-parameters: parameter | parameters T_COMMA parameter {
- $$ = $3;
- $$->next = $1;
-}
-
varargs: { $$ = false; } | T_COMMA T_ELLIPSIS { $$ = true; }
-parameter_type_list: parameters varargs {
- struct cdecl *p, *c, *n;
-
- /* Parameters were accumulated in reverse order. */
- for (p = NULL, c = $1; c; p = c, c = n) {
- n = c->next;
- c->next = p;
- }
-
+parameter_type_list: parameter varargs {
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_FUNCTION,
- .u.function.parameters = p,
+ .u.function.parameters = $1,
.u.function.variadic = $2);
+} | parameter T_COMMA parameter_type_list {
+ $$ = $3;
+ $1->next = $$->u.function.parameters;
+ $$->u.function.parameters = $1;
}
parens: T_LPAREN parameter_type_list T_RPAREN {
}
english: T_DECLARE T_IDENT T_AS english_declaration {
- $$ = $4;
- for (struct cdecl_declarator *d = $$->declarators; d; d = d->child) {
- if (d->type == CDECL_DECL_NULL) {
- d->type = CDECL_DECL_IDENT;
- d->u.ident = $2;
- }
- }
+ $$ = insert_identifier($4, $2);
} | T_TYPE english_declaration {
$$ = $2;
}
* together three different specifiers lists.
*/
post_specs: qualifiers typespec type_qual_specs {
+ $2->next = $3;
+ join_specs($2, $1);
$$ = $2;
- $$->next = $1;
- for (struct cdecl_declspec *s = $$; s; s = s->next) {
- if (!s->next) {
- s->next = $3;
- break;
- }
- }
}
english_declaration: storage_func_specs english_declarator post_specs {
+ join_specs($3, $1);
ALLOC_STRUCT($$, struct cdecl,
.specifiers = $3,
.declarators = $2);
-
- for (struct cdecl_declspec *s = $$->specifiers; s; s = s->next) {
- if (!s->next) {
- s->next = $1;
- break;
- }
- }
}
english_declarator: {
$$ = $3;
}
-english_parameter_list: english_parameters varargs {
- struct cdecl *p, *c, *n;
-
- /* Parameters were accumulated in reverse order. */
- for (p = NULL, c = $1; c; p = c, c = n) {
- n = c->next;
- c->next = p;
- }
-
+english_parameter_list: english_parameter varargs {
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_FUNCTION,
- .u.function.parameters = p,
+ .u.function.parameters = $1,
.u.function.variadic = $2);
-}
-
-english_parameters: english_parameters T_COMMA english_parameter {
+} | english_parameter T_COMMA english_parameter_list {
$$ = $3;
- $$->next = $1;
-} | english_parameter
+ $1->next = $$->u.function.parameters;
+ $$->u.function.parameters = $1;
+}
typedef_name_qual: T_IDENT qualifiers {
ALLOC_STRUCT($$, struct cdecl_declspec,
.specifiers = $1,
.declarators = $2);
} | T_IDENT T_AS english_declaration {
- $$ = $3;
- for (struct cdecl_declarator *d = $$->declarators; d; d = d->child) {
- if (d->type == CDECL_DECL_NULL) {
- d->type = CDECL_DECL_IDENT;
- d->u.ident = $1;
- }
- }
+ $$ = insert_identifier($3, $1);
}
english_array: T_VLA T_ARRAY english_vla T_OF {
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_ARRAY,
.u.array.vla = $3);
-} | T_ARRAY T_UINT T_OF {
- if ($2 == 0)
- FAIL("array length must be positive");
-
+} | T_ARRAY array_length T_OF {
ALLOC_STRUCT($$, struct cdecl_declarator,
.type = CDECL_DECL_ARRAY,
.u.array.length = $2);
-} | T_ARRAY T_OF {
- ALLOC_STRUCT($$, struct cdecl_declarator,
- .type = CDECL_DECL_ARRAY,
- .u.array.length = 0);
+}
+
+array_length: { $$ = 0; }
+array_length: T_UINT {
+ if (!($$ = $1))
+ FAIL(_("array length must be positive"));
}
english_vla: T_IDENT | {
}
%%
-void
-yyerror(YYLTYPE *loc, yyscan_t scanner, struct cdecl **out,
- const char *err)
+
+/*
+ * Expose the token string table to the rest of the library, in order to
+ * produce strings that match parser keywords.
+ *
+ * In order for this to work properly, the Bison output must be postprocessed
+ * by fix-yytname.awk to remove pointless quotation marks from the keyword
+ * strings.
+ */
+const char *cdecl__token_name(unsigned token)
+{
+ return yytname[YYTRANSLATE(token)];
+}
+
+static void
+yyerror(YYLTYPE *loc, yyscan_t scanner, struct cdecl **out, const char *err)
{
- if (strstr(err, "T_LEX_ERROR"))
+ if (strstr(err, yytname[YYTRANSLATE(T_LEX_ERROR)]))
return;
- fprintf(stderr, "%s\n", err);
+ cdecl__err(CDECL_ENOPARSE, "%s", err);
}
projects / cdecl99.git / blobdiff