X-Git-Url: https://git.draconx.ca/gitweb/cdecl99.git/blobdiff_plain/0d567b471af91e2627c94ab698a2a6d9597ba868..0c61f9637a469ac7a28b5a329551b03e6ad14d62:/src/parse.y diff --git a/src/parse.y b/src/parse.y index f7ef80c..a14f909 100644 --- a/src/parse.y +++ b/src/parse.y @@ -1,6 +1,7 @@ +%code top { /* * Parser for C declarations. - * Copyright © 2011 Nick Bowler + * Copyright © 2011-2012, 2021 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 @@ -15,20 +16,27 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ +} +%name-prefix "cdecl__yy" +%parse-param {void *scanner} %parse-param {struct cdecl **out} +%lex-param {yyscan_t scanner} %define api.pure %error-verbose %locations %{ +#include #include +#include #include "scan.h" #include "cdecl.h" +#include "cdecl-internal.h" #define FAIL(msg) do { \ - yyerror(&yylloc, NULL, msg); \ + yyerror(&yylloc, NULL, NULL, msg); \ YYERROR; \ } while (0) @@ -49,12 +57,14 @@ } %code provides { -void yyerror(YYLTYPE *, struct cdecl **, const char *); -int yyparse(struct cdecl **out); +void cdecl__free(struct cdecl *); +void cdecl__yyerror(YYLTYPE *, void *, struct cdecl **, const char *); +int cdecl__yyparse(void *scanner, struct cdecl **out); } %union { uintmax_t uintval; + _Bool boolval; char *strval; struct cdecl_declspec *declspec; struct cdecl_declarator *declarator; @@ -62,6 +72,8 @@ int yyparse(struct cdecl **out); } %{ +static void free_decl(struct cdecl *); + static void free_declspec(struct cdecl_declspec *x) { struct cdecl_declspec *p; @@ -76,39 +88,54 @@ static void free_declspec(struct cdecl_declspec *x) static void free_declarator(struct cdecl_declarator *x) { struct cdecl_declarator *p; + while (x) { - p = x->next; + p = x->child; + switch (x->type) { + case CDECL_DECL_NULL: + break; case CDECL_DECL_IDENT: free(x->u.ident); break; case CDECL_DECL_POINTER: free_declspec(x->u.pointer.qualifiers); - free_declarator(x->u.pointer.declarator); break; case CDECL_DECL_ARRAY: free(x->u.array.vla); - free_declarator(x->u.array.declarator); + break; + case CDECL_DECL_FUNCTION: + free_decl(x->u.function.parameters); break; default: assert(0); } + free(x); x = p; } } -static void free_decl(struct cdecl *decl) +static void free_decl(struct cdecl *x) { - free_declspec(decl->specifiers); - free_declarator(decl->declarators); - free(decl); + struct cdecl *p; + + while (x) { + p = x->next; + + /* The specifiers may be shared by an entire chain. */ + if (!p || p->specifiers != x->specifiers) + free_declspec(x->specifiers); + + free_declarator(x->declarators); + free(x); + x = p; + } } -void cdecl_free(struct cdecl *decl) +void cdecl__free(struct cdecl *decl) { - if (decl) - free_decl(decl); + free_decl(decl); } %} @@ -117,7 +144,9 @@ void cdecl_free(struct cdecl *decl) %destructor { free_declarator($$); } %destructor { free_decl($$); } +/* Magic tokens */ %token T_LEX_ERROR +%token T_ENGLISH %token T_IDENT "identifier" %token T_UINT "integer constant" @@ -129,53 +158,91 @@ void cdecl_free(struct cdecl *decl) %token T_LBRACKET "[" %token T_RBRACKET "]" %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 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_STRUCT "struct" -%token T_UNION "union" -%token T_ENUM "enum" +/* + * English keywords. + */ +%token T_TYPE "type" +%token T_DECLARE "declare" +%token T_POINTER "pointer" +%token T_FUNCTION "function" +%token T_RETURNING "returning" +%token T_ARRAY "array" +%token T_TO "to" +%token T_OF "of" +%token T_AS "as" +%token T_VLA "variable-length" %type vla_ident +%type varargs %type declspec_simple typespec_simple qualifier_simple %type declspec_notype declspec_noid typespec_noid typespec -%type qualifier qualifiers pointer +%type qualifier qualifiers %type declspecs declspecs_noid -%type direct_declarator declarator declarators array -%type declaration +%type direct_declarator declarator pointer array parens postfix +%type direct_declarator_ish declarator_ish parameter_type_list +%type declaration declarators declarator_wrap +%type parameter parameters + +%type english_vla +%type storage_func_specs post_specs +%type type_qual_spec type_qual_specs typedef_name_qual +%type english_declarator english_array english_function +%type english_parameter_list null_decl +%type english_parameter english_parameters +%type english english_declaration + +/* + * Harmless shift/reduce conflicts in english_parameter. See comments below + * for more details. + */ +%expect 2 %% -input: declaration { +input: T_ENGLISH english { + *out = $2; +} | declaration { *out = $1; }; -declaration: declspecs declarators T_SEMICOLON { - ALLOC_STRUCT($$, struct cdecl, - .specifiers = $1, - .declarators = $2); +semi: | T_SEMICOLON + +declaration: declspecs declarators semi { + $$ = $2; + + for (struct cdecl *i = $$; i; i = i->next) + i->specifiers = $1; }; declspecs: declspec_notype declspecs { @@ -196,10 +263,14 @@ qualifiers: { $$ = NULL; } | qualifiers qualifier { $$->next = $1; } -declarators: declarator | declarator T_COMMA declarators { +declarators: declarator_wrap | declarator_wrap T_COMMA declarators { $$ = $1; $$->next = $3; -}; +} + +declarator_wrap: declarator { + ALLOC_STRUCT($$, struct cdecl, .declarators = $1); +} declspec_simple: T_AUTO { $$ = CDECL_STOR_AUTO; } | T_TYPEDEF { $$ = CDECL_STOR_TYPEDEF; } @@ -208,17 +279,18 @@ declspec_simple: T_AUTO { $$ = CDECL_STOR_AUTO; } | T_REGISTER { $$ = 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; } +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; } @@ -256,8 +328,6 @@ typespec: typespec_noid | T_STRUCT T_IDENT { declspec_noid: declspec_notype | typespec_noid -pointer: T_ASTERISK qualifiers { $$ = $2; } - vla_ident: T_IDENT | T_ASTERISK { ALLOC($$, sizeof ""); strcpy($$, ""); @@ -279,33 +349,244 @@ array: T_LBRACKET T_UINT T_RBRACKET { .type = CDECL_DECL_ARRAY); } -declarator: direct_declarator | pointer direct_declarator { +parameter: declspecs declarator { + ALLOC_STRUCT($$, struct cdecl, + .specifiers = $1, + .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; + } + + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_FUNCTION, + .u.function.parameters = p, + .u.function.variadic = $2); +} + +parens: T_LPAREN parameter_type_list T_RPAREN { + $$ = $2; +} | T_LPAREN declarator_ish T_RPAREN { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_FUNCTION); + ALLOC_STRUCT($$->u.function.parameters, struct cdecl, + .declarators = $2); +} + +pointer: T_ASTERISK qualifiers direct_declarator { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_POINTER, + .u.pointer.qualifiers = $2, + .child = $3); +} | T_ASTERISK qualifiers pointer { ALLOC_STRUCT($$, struct cdecl_declarator, .type = CDECL_DECL_POINTER, - .u.pointer.qualifiers = $1, - .u.pointer.declarator = $2); + .u.pointer.qualifiers = $2, + .child = $3); +} + +declarator: direct_declarator | pointer +declarator_ish: direct_declarator_ish | pointer +postfix: array | parens + +direct_declarator_ish: { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_NULL); +} | direct_declarator_ish postfix { + $$ = $2; + $$->child = $1; } direct_declarator: { ALLOC_STRUCT($$, struct cdecl_declarator, - .type = CDECL_DECL_IDENT, - .u.ident = NULL); + .type = CDECL_DECL_NULL); } | T_IDENT { ALLOC_STRUCT($$, struct cdecl_declarator, .type = CDECL_DECL_IDENT, .u.ident = $1); -} | direct_declarator array { +} | direct_declarator postfix { $$ = $2; - $$->u.array.declarator = $1; -} | T_LPAREN declarator T_RPAREN { + $$->child = $1; +} + +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; + } + } +} | T_TYPE english_declaration { $$ = $2; -}; +} + +storage_func_specs: { $$ = NULL; } | declspec_simple storage_func_specs { + ALLOC_STRUCT($$, struct cdecl_declspec, + .type = $1, + .next = $2); +} + +type_qual_spec: typespec_noid | qualifier + +type_qual_specs: { $$ = NULL; } | type_qual_spec type_qual_specs { + $$ = $1; + $$->next = $2; +} + +/* + * The "qualifiers" nonterminal needs to be used here to avoid shift/reduce + * conflicts with pointer declarators. So we end up needing to stitch + * together three different specifiers lists. + */ +post_specs: qualifiers typespec type_qual_specs { + $$ = $2; + $$->next = $1; + for (struct cdecl_declspec *s = $$; s; s = s->next) { + if (!s->next) { + s->next = $3; + break; + } + } +} + +english_declaration: storage_func_specs english_declarator post_specs { + ALLOC_STRUCT($$, struct cdecl, + .specifiers = $3, + .declarators = $2); + + for (struct cdecl_declspec *s = $$->specifiers; s; s = s->next) { + if (!s->next) { + s->next = $1; + break; + } + } +} + +english_declarator: { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_NULL); +} | english_declarator qualifiers T_POINTER T_TO { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_POINTER, + .child = $1, + .u.pointer.qualifiers = $2); +} | english_declarator english_array { + $$ = $2; + $$->child = $1; +} | english_declarator english_function { + $$ = $2; + $$->child = $1; +} + +english_function: T_FUNCTION T_RETURNING { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_FUNCTION, + .u.function.parameters = NULL); +} | T_FUNCTION T_LPAREN english_parameter_list T_RPAREN T_RETURNING { + $$ = $3; +} + +english_parameter_list: english_parameters varargs { + struct cdecl *p, *c, *n; + + /* Parameters were accumulated in reverse order. */ + for (p = NULL, c = $1; c; p = c, c = n) { + n = c->next; + c->next = p; + } + + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_FUNCTION, + .u.function.parameters = p, + .u.function.variadic = $2); +} + +english_parameters: english_parameters T_COMMA english_parameter { + $$ = $3; + $$->next = $1; +} | english_parameter + +typedef_name_qual: T_IDENT qualifiers { + ALLOC_STRUCT($$, struct cdecl_declspec, + .type = CDECL_TYPE_IDENT, + .ident = $1, + .next = $2); +} + +null_decl: { + ALLOC_STRUCT($$, struct cdecl_declarator, + .type = CDECL_DECL_NULL); +} + +/* + * There is a small shift/reduce conflict here. An unadorned identifier + * as the first thing in the parameter might be a typedef name deep in the + * first english_declaration (thus empty storage_func_specs and empty + * english_declarator need to be reduced) or it might be the identifier + * before the "as" (thus the identifier should be shifted). + * + * The typedef name conflict is the only issue, so treating it as a special + * case makes the shift harmless. + */ +english_parameter: english_declaration | typedef_name_qual null_decl { + ALLOC_STRUCT($$, struct cdecl, + .specifiers = $1, + .declarators = $2); +} | T_IDENT T_AS english_declaration { + $$ = $3; + for (struct cdecl_declarator *d = $$->declarators; d; d = d->child) { + if (d->type == CDECL_DECL_NULL) { + d->type = CDECL_DECL_IDENT; + d->u.ident = $1; + } + } +} + +english_array: T_VLA T_ARRAY english_vla T_OF { + ALLOC_STRUCT($$, 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"); + + 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); +} + +english_vla: T_IDENT | { + ALLOC($$, sizeof ""); + strcpy($$, ""); +} %% -void yyerror(YYLTYPE *loc, struct cdecl **out, const char *err) +void +yyerror(YYLTYPE *loc, yyscan_t scanner, struct cdecl **out, const char *err) { if (strstr(err, "T_LEX_ERROR")) return; - fprintf(stderr, "%s\n", err); + cdecl__set_error(&(const struct cdecl_error){ + .code = CDECL_ENOPARSE, + .str = err, + }); }