442 lines
13 KiB
Scheme
442 lines
13 KiB
Scheme
;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; parser.mes: This file is part of Mes.
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;;;
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;;; Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Mes is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; parser.mes is a translation of cgram.y to Dominique Boucher's LALR.
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;;; It parses a minimal int main () {}, see examples/main.c
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;;; Code:
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(cond-expand
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(guile
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;;(use-modules (srfi srfi-1))
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(use-modules (system base lalr))
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;;(use-modules (ice-9 match))
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)
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(mes
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(mes-use-module (mes lalr))))
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(gc)
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(define c-parser
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(lalr-parser
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(lbrace rbrace lparen rparen lbracket rbracket semicolon colon dot comma
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=
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Identifier NumericLiteral StringLiteral
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break case continue goto label
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return switch
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for
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If else
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(left: or && ! * / + -)
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(left: bool double float enum void int struct)
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(left: < > <= >=)
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(left: ++ --)
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(nonassoc: == !=)
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)
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(program
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(translation-unit *eoi*) : `(root ,@$1))
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(translation-unit
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(external-declaration) : `(,$1)
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(translation-unit external-declaration) : `(,@$1 ,@$2))
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(external-declaration
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(function-definition) : $1
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(declaration) : $1
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(error semicolon) : (begin (syntax-error "external declaration" @1 $1) '()))
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(function-definition
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(declarator compound-statement) : `(function ,$1 (signature int (formals)) ,$2)
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(declaration-specifiers declarator compound-statement) : `(function ,$2 (signature ,$1 (formals)) ,$3)
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(declaration-specifiers declarator declaration-list compound-statement) : `(function ,$2 (signature ,$1 ,$3) ,$4))
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(declaration
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(declaration-specifiers semicolon) : `(,$1)
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(declaration-specifiers init-declarator-list semicolon): `((,@$1 ,@$2))
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)
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(declaration-list
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(declaration) : `(formals ,@$1)
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(declaration-list declaration) : `(,@$1 ,@(cdr $2)))
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(declaration-specifiers
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;;(storage-class-specifier) : `(,$1)
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(type-specifier) : `(,$1)
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;;(type-qualifier) : `($1)
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;;(storage-class-specifier declaration-specifiers) : (cons $1 $2)
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(type-specifier declaration-specifiers) : `(,$1 ,$2)
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;;(type-qualifier declaration-specifiers) : (cons $1 $2)
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)
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;; (storage_class_specifier
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;; (auto)
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;; (extern)
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;; (register)
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;; (static)
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;; (typedef))
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(type-specifier
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;; (char) : $1
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;; (double) : $1
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;; (void) : $1
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;; (float)
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(int) : 'int
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;; (long)
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;; (short)
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;; (unsigned)
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;; (struct-or-enum-specifier)
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;; (enum-specifier)
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;; (type-name)
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)
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;; (type-qualifier
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;; (const)
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;; (volatile))
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;; struct_or_union_specifier:
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;; struct_or_union_ident lbrace struct_declaration_list rbrace
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;; | struct_or_union_ident
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;; ;
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;; struct_or_union_ident: struct_or_union
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;; | struct_or_union Identifier
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;; ;
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;; struct_or_union: STRUCT { ; }
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;; | UNION { ; }
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;; ;
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;; struct_declaration_list: struct_declaration
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;; | struct_declaration_list struct_declaration
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;; ;
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(init-declarator-list
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;; (init-declarator %prec comma) : `(,$1) HUH?
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(init-declarator) : `(,$1)
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(init-declarator-list comma init-declarator) : `(,$1)
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)
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;; init_declarator_list: init_declarator %prec comma
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;; | init_declarator_list comma init_declarator
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;; ;
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(init-declarator
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(declarator) : $1
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(declarator = initializer) : `(= ,$1 ,$3)
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;; | error { yyerror("init declarator error"); }
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)
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;; struct_declaration: specifier_qualifier_list struct_declarator_list semicolon
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;; ;
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;; specifier_qualifier_list: type_specifier
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;; | type_qualifier
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;; | type_specifier specifier_qualifier_list
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;; | type_qualifier specifier_qualifier_list
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;; ;
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;; struct_declarator_list: struct_declarator
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;; | struct_declarator_list comma struct_declarator
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;; ;
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;; struct_declarator: declarator
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;; | COLON constant_expression { ; }
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;; | declarator COLON constant_expression
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;; ;
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;; enum_specifier: ENUM Identifier lbrace enumerator_list rbrace { ; }
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;; | ENUM lbrace enumerator_list rbrace { ; }
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;; | ENUM Identifier { ; }
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;; ;
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;; enumerator_list: enumerator
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;; | enumerator_list comma enumerator
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;; ;
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;; enumerator: Identifier
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;; | Identifier EQ constant_expression
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;; ;
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(declarator
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(direct-declarator) : $1
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;;(pointer direct-declarator)
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)
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(direct-declarator
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(Identifier) : $1
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;; (lparen declarator rparen)
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;; (direct-declarator lbracket rbracket)
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;; (direct-declarator lbracket constant-expression rbracket)
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;; (lbracket constant-expression rbracket)
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;; (direct-declarator lparen parameter-type-list rparen)
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(direct-declarator lparen rparen) : $1
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;; (direct-declarator lparen identifier-list rparen)
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)
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;; pointer: STAR { ; }
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;; | STAR pointer { ; }
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;; | STAR type_qualifier_list { ; }
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;; | STAR type_qualifier_list pointer { ; }
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;; ;
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;; type_qualifier_list: type_qualifier
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;; | type_qualifier_list type_qualifier
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;; ;
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;; parameter_type_list: parameter_list
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;; | parameter_list comma ELLIPSIS
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;; ;
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;; parameter_list: parameter_declaration
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;; | parameter_list comma parameter_declaration
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;; ;
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;; parameter_declaration:
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;; declaration_specifiers declarator
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;; | declaration_specifiers
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;; | declaration_specifiers abstract_declarator
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;; ;
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;; identifier_list: Identifier
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;; | identifier_list comma Identifier
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;; | error { yyerror("identifier list error"); }
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;; ;
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(initializer
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;;(assignment-expression %prec comma) HUH?
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(assignment-expression) : $1
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;; initializer: assignment_expression %prec comma
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;; | lbrace initializer_list rbrace { ; }
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;; | lbrace initializer_list comma rbrace { ; }
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;; ;
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)
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;; initializer_list: initializer %prec comma
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;; | initializer_list comma initializer
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;; ;
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;; type_name: specifier_qualifier_list
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;; | specifier_qualifier_list abstract_declarator
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;; ;
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;; abstract_declarator: pointer
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;; | direct_abstract_declarator
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;; | pointer direct_abstract_declarator
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;; ;
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;; direct_abstract_declarator:
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;; lparen abstract_declarator rparen { ; }
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;; | lbrace rbrace { ; }
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;; | direct_abstract_declarator lbrace rbrace
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;; | lbrace constant_expression rbrace { ; }
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;; | direct_abstract_declarator lbrace constant_expression rbrace
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;; | lparen rparen { ; }
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;; | direct_abstract_declarator lparen rparen
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;; | lparen parameter_list rparen { ; }
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;; | direct_abstract_declarator lparen parameter_list rparen
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;; ;
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(statement
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;;(labeled-statement)
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(expression-statement) : $1
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(compound-statement) : $1
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;;(selection-statement)
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(iteration-statement) : $1
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(jump-statement) : $1
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(semicolon) : '()
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(error semicolon) : (begin (syntax-error "statement error" @1 $1) '())
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(error rbrace) : (begin (syntax-error "statement error" @1 $1) '()))
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;; labeled_statement:
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;; Identifier COLON statement
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;; | CASE x COLON statement { ; }
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;; | DEFAULT COLON statement { ; }
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;; ;
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(expression-statement
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(x semicolon) : $1)
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(compound-statement
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(lbrace rbrace) : '(compound)
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(lbrace declaration-list rbrace) : `(compound ,$2)
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(lbrace statement-list rbrace) : `(compound ,@$2)
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(lbrace declaration-list statement-list rbrace) : `(compound ,$2 ,@$3))
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(statement-list
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(statement) : `(,$1)
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(statement-list statement) : `(,@$1 ,$2))
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;; selection_statement:
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;; IF lparen x rparen statement { ; }
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;; | IF lparen x rparen statement ELSE statement { ; }
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;; | SWITCH lparen x rparen statement { ; }
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;; ;
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(iteration-statement
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;; iteration_statement:
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;; WHILE lparen x rparen statement { ; }
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;; | DO statement WHILE lparen x rparen semicolon { ; }
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(for lparen forcntrl rparen statement) : `(for ,@$3 ,$5))
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(forcntrl
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;; | semicolon semicolon x { ; }
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;; | semicolon x semicolon { ; }
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;; | semicolon x semicolon x { ; }
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;; | x semicolon semicolon
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;; | x semicolon semicolon x
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;; | x semicolon x semicolon
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(x semicolon x semicolon x) : `((start ,$1) (test ,$3) (step ,$5)))
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(jump-statement
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(goto Identifier semicolon) : `(goto ,$2)
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(continue semicolon) : '(continue)
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(break semicolon) : '(break)
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(return semicolon) : '(return)
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(return x semicolon) : `(return ,$2))
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(x
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(assignment-expression) : $1
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(x comma assignment-expression) : `(,$1 ,@$3))
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(assignment-expression
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(equality-expression) : $1 ;; skip some
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;;(conditional-expression) : $1
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(unary-expression assignment-operator assignment-expression) : `(,$2 ,$1 ,$3))
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(assignment-operator
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(=) : '=)
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;; | PLUSEQ { ; }
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;; | MINUSEQ { ; }
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;; | MUEQ { ; }
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;; | DIVEQ { ; }
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;; | MODEQ { ; }
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;; | SLEQ { ; }
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;; | SREQ { ; }
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;; | ANEQ { ; }
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;; | OREQ { ; }
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;; | XOREQ { ; }
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;; ;
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;; conditional_expression: logical_or_expression
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;; | logical_or_expression IF_THEN x COLON conditional_expression
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;; ;
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;; constant_expression: conditional_expression
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;; ;
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;; logical_or_expression: logical_and_expression
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;; | logical_or_expression OROR logical_and_expression
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;; ;
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;; logical_and_expression: inclusive_or_expression
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;; | logical_and_expression ANDAND inclusive_or_expression
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;; ;
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;; inclusive_or_expression: exclusive_or_expression
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;; | inclusive_or_expression OR exclusive_or_expression
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;; ;
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;; exclusive_or_expression: and_expression
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;; | exclusive_or_expression XOR and_expression
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;; ;
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;; and_expression: equality_expression
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;; | and_expression AND equality_expression
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;; ;
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(equality-expression
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(relational-expression) : $1
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(equality-expression == relational-expression) : `(== ,$1 ,$3)
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(equality-expression != relational-expression) : `(!= ,$1 ,$3))
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(relational-expression
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(shift-expression) : $1
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(relational-expression < shift-expression) : `(< ,$1 ,$3)
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(relational-expression <= shift-expression) : `(<= ,$1 ,$3)
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(relational-expression > shift-expression) : `(> ,$1 ,$3)
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(relational-expression >= shift-expression) : `(>= ,$1 ,$3))
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(shift-expression
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(unary-expression) : $1 ;; skip some
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;; shift_expression: additive_expression
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;; | shift_expression LTLT additive_expression
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;; | shift_expression GTGT additive_expression
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;; ;
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)
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;; additive_expression: multiplicative_expression
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;; | additive_expression PLUS multiplicative_expression
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;; | additive_expression MINUS multiplicative_expression
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;; ;
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;; multiplicative_expression: cast_expression
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;; | multiplicative_expression STAR cast_expression
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;; | multiplicative_expression DIV cast_expression
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;; | multiplicative_expression MOD cast_expression
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;; ;
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;; cast_expression: unary_expression
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;; | lparen type_name rparen cast_expression { ; }
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;; ;
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(unary-expression
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(postfix-expression) : $1
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(++ unary-expression) : `(++x ,$2)
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(-- unary-expression) : `(--x ,$2)
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;; | SIZEOF unary_expression { ; }
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;; | SIZEOF lparen type_name rparen %prec SIZEOF { ; }
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;; | STAR cast_expression { ; }
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;; | AND cast_expression { ; }
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;; | MINUS cast_expression { ; }
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;; | PLUS cast_expression { ; }
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;; | NEG cast_expression { ; }
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;; | NOT cast_expression { ; }
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;; ;
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)
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(postfix-expression
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(primary-expression) : $1
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;; | postfix_expression lbracket x rbracket
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(postfix-expression lparen rparen) : `(call ,$1 (arguments))
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(postfix-expression lparen argument-expression-list rparen) : `(call ,$1 ,$3)
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;; | postfix_expression FOLLOW Identifier
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;; | postfix_expression DOT Identifier
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(postfix-expression ++) : `(x++ ,$1)
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(postfix-expression --) : `(x-- ,$1)
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)
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(primary-expression
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(Identifier): $1
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(NumericLiteral) : $1
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;; INT_LITERAL
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;; CHAR_LITERAL
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;; FLOAT_LITERAL
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;; STRING_LITERAL
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(StringLiteral) : $1
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;; lparen x rparen
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)
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;;
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(argument-expression-list
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(assignment-expression) : `(arguments ,$1)
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(argument-expression-list comma assignment-expression): `(,@$1 ,@(cdr $3)))))
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