* Replaced the SDF parser by a substantially faster Bison/Flex
parser (roughly 80x faster). The absolutely latest version of Bison (1.875c) is required for reentrant GLR support, as well as a recent version of Flex (say, 2.5.31). Note that most Unix distributions ship with the prehistoric Flex 2.5.4, which doesn't support reentrancy.
This commit is contained in:
Eelco Dolstra
parent
abd1878b26
commit
c5baaafae6
6 changed files with 261 additions and 252 deletions
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@ -1,20 +1,22 @@
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noinst_LIBRARIES = libexpr.a
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libexpr_a_SOURCES = nixexpr.cc nixexpr.hh parser.cc parser.hh \
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eval.cc eval.hh primops.cc primops.hh nix.sdf
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eval.cc eval.hh primops.cc primops.hh \
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lexer-tab.c lexer-tab.h parser-tab.c parser-tab.h
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AM_CXXFLAGS = \
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-I.. -I../../externals/inst/include -I../libutil -I../libstore
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AM_CFLAGS = \
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-I../../externals/inst/include
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# Parse table generation.
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# Parser generation.
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parser.o: parse-table.h
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parser-tab.c parser-tab.h: parser.y
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../grammartest/inst/bin/bison -v -o parser-tab.c parser.y -d
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parse-table.h: nix.tbl
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../bin2c/bin2c nixParseTable < $< > $@ || (rm $@ && exit 1)
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lexer-tab.c lexer-tab.h: lexer.l
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flex --outfile lexer-tab.c --header-file=lexer-tab.h lexer.l
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%.tbl: %.sdf
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../../externals/inst/bin/sdf2table -s -i $< -o $@
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CLEANFILES = parse-table.h nix.tbl
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CLEANFILES =
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@ -137,6 +137,8 @@ Expr evalExpr2(EvalState & state, Expr e)
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/* Any encountered variables must be undeclared or primops. */
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if (atMatch(m, e) >> "Var" >> s1) {
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if (s1 == "null") return primNull(state);
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if (s1 == "true") return ATmake("Bool(True)");
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if (s1 == "false") return ATmake("Bool(False)");
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return e;
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}
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78
src/libexpr/lexer.l
Normal file
78
src/libexpr/lexer.l
Normal file
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@ -0,0 +1,78 @@
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%option reentrant bison-bridge bison-locations
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%option noyywrap
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%option never-interactive
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%{
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#include <string.h>
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#include <aterm2.h>
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#include "parser-tab.h"
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static void initLoc(YYLTYPE * loc)
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{
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loc->first_line = 1;
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loc->first_column = 1;
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}
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static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
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{
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while (len--) {
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switch (*s++) {
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case '\n':
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++loc->first_line;
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loc->first_column = 1;
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break;
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default:
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++loc->first_column;
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}
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}
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}
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#define YY_USER_INIT initLoc(yylloc)
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#define YY_USER_ACTION adjustLoc(yylloc, yytext, yyleng);
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%}
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ID [a-zA-Z\_][a-zA-Z0-9\_\']*
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INT [0-9]+
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STR \"[^\n\"]*\"
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PATH [a-zA-Z0-9\.\_\-\+]*(\/[a-zA-Z0-9\.\_\-\+]+)+
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URI [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']*
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%%
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if { return IF; }
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then { return THEN; }
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else { return ELSE; }
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assert { return ASSERT; }
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let { return LET; }
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rec { return REC; }
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\=\= { return EQ; }
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\!\= { return NEQ; }
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\&\& { return AND; }
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\|\| { return OR; }
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\-\> { return IMPL; }
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{ID} { yylval->t = ATmake("<str>", yytext); return ID; /* !!! alloc */ }
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{INT} { return INT; }
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{STR} { int len = strlen(yytext);
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yytext[len - 1] = 0;
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yylval->t = ATmake("<str>", yytext + 1);
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yytext[len - 1] = '\"';
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return STR; /* !!! alloc */
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}
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{PATH} { yylval->t = ATmake("<str>", yytext); return PATH; /* !!! alloc */ }
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{URI} { yylval->t = ATmake("<str>", yytext); return URI; /* !!! alloc */ }
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[ \t\n]+ /* eat up whitespace */
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\#[^\n]* /* single-line comments */
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\/\*(.|\n)*\*\/ /* long comments */
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. return yytext[0];
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%%
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@ -1,131 +0,0 @@
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definition
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module Main
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imports Fix
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Top level syntax.
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module Fix
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imports Fix-Exprs Fix-Layout
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Expressions.
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module Fix-Exprs
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imports Fix-Lexicals
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exports
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sorts Expr Formal Bind Binds ExprList
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context-free syntax
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Id -> Expr {cons("Var")}
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Int -> Expr {cons("Int")}
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Str -> Expr {cons("Str")}
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Uri -> Expr {cons("Uri")}
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Path -> Expr {cons("Path")}
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"(" Expr ")" -> Expr {bracket}
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Expr Expr -> Expr {cons("Call"), left}
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"{" {Formal ","}* "}" ":" Expr -> Expr {cons("Function")}
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Id -> Formal {cons("NoDefFormal")}
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Id "?" Expr -> Formal {cons("DefFormal")}
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"assert" Expr ";" Expr -> Expr {cons("Assert")}
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"rec" "{" Binds "}" -> Expr {cons("Rec")}
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"let" "{" Binds "}" -> Expr {cons("LetRec")}
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"{" Binds "}" -> Expr {cons("Attrs")}
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Bind* -> Binds
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Id "=" Expr ";" -> Bind {cons("Bind")}
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"[" ExprList "]" -> Expr {cons("List")}
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"" -> ExprList {cons("ExprNil")}
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Expr ExprList -> ExprList {cons("ExprCons")}
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Expr "." Id -> Expr {cons("Select")}
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"if" Expr "then" Expr "else" Expr -> Expr {cons("If")}
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Expr "==" Expr -> Expr {cons("OpEq"), non-assoc}
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Expr "!=" Expr -> Expr {cons("OpNEq"), non-assoc}
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"!" Expr -> Expr {cons("OpNot")}
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Expr "&&" Expr -> Expr {cons("OpAnd"), right}
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Expr "||" Expr -> Expr {cons("OpOr"), right}
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Expr "->" Expr -> Expr {cons("OpImpl"), right}
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context-free priorities
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Expr "." Id -> Expr
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> Expr ExprList -> ExprList
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> Expr Expr -> Expr
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> "!" Expr -> Expr
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> Expr "==" Expr -> Expr
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> Expr "!=" Expr -> Expr
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> Expr "&&" Expr -> Expr
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> Expr "||" Expr -> Expr
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> Expr "->" Expr -> Expr
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> "assert" Expr ";" Expr -> Expr
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> "{" {Formal ","}* "}" ":" Expr -> Expr
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Lexical syntax.
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module Fix-Lexicals
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exports
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sorts Id Int Str Path PathComp Uri
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lexical syntax
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[a-zA-Z\_][a-zA-Z0-9\_\']* -> Id
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"rec" -> Id {reject}
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"let" -> Id {reject}
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"if" -> Id {reject}
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"then" -> Id {reject}
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"else" -> Id {reject}
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"assert" -> Id {reject}
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[0-9]+ -> Int
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"\"" ~[\n\"]* "\"" -> Str
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"." ("/" PathComp)+ -> Path
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".." ("/" PathComp)+ -> Path
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("/" PathComp)+ -> Path
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[a-zA-Z0-9\.\_\-\+]+ -> PathComp
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[a-zA-Z] [a-zA-Z0-9\+\-\.]* ":" [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']* -> Uri
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lexical restrictions
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Id -/- [a-zA-Z0-9\_\']
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Int -/- [0-9]
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Path -/- [a-zA-Z0-9\.\_\-\+\/]
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Uri -/- [a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*\']
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Layout.
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module Fix-Layout
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exports
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sorts HashComment Asterisk Comment
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lexical syntax
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[\ \t\n] -> LAYOUT
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HashComment -> LAYOUT
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Comment -> LAYOUT
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"#" ~[\n]* -> HashComment
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"/*" ( ~[\*] | Asterisk )* "*/" -> Comment
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[\*] -> Asterisk
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lexical restrictions
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Asterisk -/- [\/]
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HashComment -/- ~[\n]
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context-free restrictions
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LAYOUT? -/- [\ \t\n]
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@ -5,133 +5,63 @@
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#include <fcntl.h>
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#include <unistd.h>
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extern "C" {
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#include <sglr.h>
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#include <asfix2.h>
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}
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#include "aterm.hh"
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#include "parser.hh"
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#include "parse-table.h"
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/* Cleanup cleans up an imploded parse tree into an actual abstract
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syntax tree that we can evaluate. It removes quotes around
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strings, converts integer literals into actual integers, and
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absolutises paths relative to the directory containing the input
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file. */
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struct Cleanup : TermFun
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struct ParseData
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{
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Expr result;
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string basePath;
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virtual ATerm operator () (ATerm e)
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{
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checkInterrupt();
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ATMatcher m;
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string s;
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if (atMatch(m, e) >> "Str" >> s)
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return ATmake("Str(<str>)",
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string(s, 1, s.size() - 2).c_str());
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if (atMatch(m, e) >> "Path" >> s)
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return ATmake("Path(<str>)", absPath(s, basePath).c_str());
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if (atMatch(m, e) >> "Int" >> s) {
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istringstream s2(s);
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int n;
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s2 >> n;
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return ATmake("Int(<int>)", n);
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}
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if (atMatch(m, e) >> "Var" >> "true")
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return ATmake("Bool(True)");
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if (atMatch(m, e) >> "Var" >> "false")
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return ATmake("Bool(False)");
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if (atMatch(m, e) >> "ExprNil")
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return (ATerm) ATempty;
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ATerm e1;
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ATermList e2;
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if (atMatch(m, e) >> "ExprCons" >> e1 >> e2)
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return (ATerm) ATinsert(e2, e1);
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return e;
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}
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string location;
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string error;
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};
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extern "C" {
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#include "parser-tab.h"
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#include "lexer-tab.h"
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/* Callbacks for getting from C to C++. Due to a (small) bug in the
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GLR code of Bison we cannot currently compile the parser as C++
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code. */
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void setParseResult(ParseData * data, ATerm t)
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{
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data->result = t;
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}
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ATerm absParsedPath(ParseData * data, ATerm t)
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{
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return string2ATerm(absPath(aterm2String(t), data->basePath).c_str());
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}
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void parseError(ParseData * data, char * error, int line, int column)
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{
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data->error = (format("%1%, at line %2%, column %3%, of %4%")
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% error % line % column % data->location).str();
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}
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int yyparse(yyscan_t scanner, ParseData * data);
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}
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static Expr parse(const char * text, const string & location,
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const Path & basePath)
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||||
{
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/* Initialise the SDF libraries. */
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static bool initialised = false;
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||||
static ATerm parseTable = 0;
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static language lang = 0;
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yyscan_t scanner;
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ParseData data;
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||||
data.basePath = basePath;
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||||
data.location = location;
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||||
|
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if (!initialised) {
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||||
PT_initMEPTApi();
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||||
PT_initAsFix2Api();
|
||||
SGinitParser(ATfalse);
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||||
|
||||
ATprotect(&parseTable);
|
||||
parseTable = ATreadFromBinaryString(
|
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(char *) nixParseTable, sizeof nixParseTable);
|
||||
if (!parseTable)
|
||||
throw Error(format("cannot construct parse table term"));
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||||
|
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ATprotect(&lang);
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lang = ATmake("Nix");
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||||
if (!SGopenLanguageFromTerm("nix-parse", lang, parseTable))
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throw Error(format("cannot open language"));
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||||
|
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SG_STARTSYMBOL_ON();
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SG_OUTPUT_ON();
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SG_ASFIX2ME_ON();
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SG_AMBIGUITY_ERROR_ON();
|
||||
SG_FILTER_OFF();
|
||||
|
||||
initialised = true;
|
||||
}
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||||
|
||||
/* Parse it. */
|
||||
ATerm result = SGparseString(lang, "Expr", (char *) text);
|
||||
if (!result)
|
||||
throw SysError(format("parse failed in `%1%'") % location);
|
||||
if (SGisParseError(result))
|
||||
throw Error(format("parse error in `%1%': %2%")
|
||||
% location % result);
|
||||
|
||||
/* Implode it. */
|
||||
PT_ParseTree tree = PT_makeParseTreeFromTerm(result);
|
||||
if (!tree)
|
||||
throw Error(format("cannot create parse tree"));
|
||||
yylex_init(&scanner);
|
||||
yy_scan_string(text, scanner);
|
||||
int res = yyparse(scanner, &data);
|
||||
yylex_destroy(scanner);
|
||||
|
||||
ATerm imploded = PT_implodeParseTree(tree,
|
||||
ATtrue,
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||||
ATtrue,
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||||
ATtrue,
|
||||
ATtrue,
|
||||
ATtrue,
|
||||
ATtrue,
|
||||
ATfalse,
|
||||
ATtrue,
|
||||
ATtrue,
|
||||
ATtrue,
|
||||
ATfalse);
|
||||
if (!imploded)
|
||||
throw Error(format("cannot implode parse tree"));
|
||||
if (res) throw Error(data.error);
|
||||
|
||||
printMsg(lvlVomit, format("imploded parse tree of `%1%': %2%")
|
||||
% location % imploded);
|
||||
|
||||
/* Finally, clean it up. */
|
||||
Cleanup cleanup;
|
||||
cleanup.basePath = basePath;
|
||||
return bottomupRewrite(cleanup, imploded);
|
||||
return data.result;
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -171,7 +101,7 @@ Expr parseExprFromFile(Path path)
|
|||
readFull(fd, (unsigned char *) text, st.st_size);
|
||||
text[st.st_size] = 0;
|
||||
|
||||
return parse(text, path, dirOf(path));
|
||||
return parse(text, "`" + path + "'", dirOf(path));
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
128
src/libexpr/parser.y
Normal file
128
src/libexpr/parser.y
Normal file
|
|
@ -0,0 +1,128 @@
|
|||
%glr-parser
|
||||
%pure-parser
|
||||
%locations
|
||||
%error-verbose
|
||||
%parse-param { yyscan_t scanner }
|
||||
%parse-param { void * data }
|
||||
%lex-param { yyscan_t scanner }
|
||||
|
||||
%{
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <aterm2.h>
|
||||
|
||||
#include "parser-tab.h"
|
||||
#include "lexer-tab.h"
|
||||
|
||||
void setParseResult(void * data, ATerm t);
|
||||
void parseError(void * data, char * error, int line, int column);
|
||||
ATerm absParsedPath(void * data, ATerm t);
|
||||
|
||||
void yyerror(YYLTYPE * loc, yyscan_t scanner, void * data, char * s)
|
||||
{
|
||||
parseError(data, s, loc->first_line, loc->first_column);
|
||||
}
|
||||
|
||||
%}
|
||||
|
||||
%union {
|
||||
ATerm t;
|
||||
ATermList ts;
|
||||
}
|
||||
|
||||
%type <t> start expr expr_function expr_assert expr_op
|
||||
%type <t> expr_app expr_select expr_simple bind formal
|
||||
%type <ts> binds expr_list formals
|
||||
%token <t> ID INT STR PATH URI
|
||||
%token IF THEN ELSE ASSERT LET REC EQ NEQ AND OR IMPL
|
||||
|
||||
%nonassoc IMPL
|
||||
%left OR
|
||||
%left AND
|
||||
%nonassoc EQ NEQ
|
||||
%left NEG
|
||||
|
||||
%%
|
||||
|
||||
start: expr { setParseResult(data, $1); };
|
||||
|
||||
expr: expr_function;
|
||||
|
||||
expr_function
|
||||
: '{' formals '}' ':' expr_function
|
||||
{ $$ = ATmake("Function(<term>, <term>)", $2, $5); }
|
||||
| expr_assert
|
||||
;
|
||||
|
||||
expr_assert
|
||||
: ASSERT expr ';' expr_assert
|
||||
{ $$ = ATmake("Assert(<term>, <term>)", $2, $4); }
|
||||
| expr_op
|
||||
;
|
||||
|
||||
expr_op
|
||||
: '!' expr_op %prec NEG { $$ = ATmake("OpNot(<term>)", $2); }
|
||||
| expr_op EQ expr_op { $$ = ATmake("OpEq(<term>, <term>)", $1, $3); }
|
||||
| expr_op NEQ expr_op { $$ = ATmake("OpNEq(<term>, <term>)", $1, $3); }
|
||||
| expr_op AND expr_op { $$ = ATmake("OpAnd(<term>, <term>)", $1, $3); }
|
||||
| expr_op OR expr_op { $$ = ATmake("OpOr(<term>, <term>)", $1, $3); }
|
||||
| expr_op IMPL expr_op { $$ = ATmake("OpImpl(<term>, <term>)", $1, $3); }
|
||||
| expr_app
|
||||
;
|
||||
|
||||
expr_app
|
||||
: expr_app expr_select
|
||||
{ $$ = ATmake("Call(<term>, <term>)", $1, $2); }
|
||||
| expr_select { $$ = $1; }
|
||||
;
|
||||
|
||||
expr_select
|
||||
: expr_select '.' ID
|
||||
{ $$ = ATmake("Select(<term>, <term>)", $1, $3); }
|
||||
| expr_simple { $$ = $1; }
|
||||
;
|
||||
|
||||
expr_simple
|
||||
: ID { $$ = ATmake("Var(<term>)", $1); }
|
||||
| STR { $$ = ATmake("Str(<term>)", $1); }
|
||||
| PATH { $$ = ATmake("Path(<term>)", absParsedPath(data, $1)); }
|
||||
| URI { $$ = ATmake("Uri(<term>)", $1); }
|
||||
| '(' expr ')' { $$ = $2; }
|
||||
| LET '{' binds '}' { $$ = ATmake("LetRec(<term>)", $3); }
|
||||
| REC '{' binds '}' { $$ = ATmake("Rec(<term>)", $3); }
|
||||
| '{' binds '}' { $$ = ATmake("Attrs(<term>)", $2); }
|
||||
| '[' expr_list ']' { $$ = ATmake("List(<term>)", $2); }
|
||||
| IF expr THEN expr ELSE expr
|
||||
{ $$ = ATmake("If(<term>, <term>, <term>)", $2, $4, $6); }
|
||||
;
|
||||
|
||||
binds
|
||||
: binds bind { $$ = ATinsert($1, $2); }
|
||||
| { $$ = ATempty; }
|
||||
;
|
||||
|
||||
bind
|
||||
: ID '=' expr ';'
|
||||
{ $$ = ATmake("Bind(<term>, <term>)", $1, $3); }
|
||||
;
|
||||
|
||||
expr_list
|
||||
: expr_select expr_list { $$ = ATinsert($2, $1); }
|
||||
/* yes, this is right-recursive, but it doesn't matter since
|
||||
otherwise we would need ATreverse which requires unbounded
|
||||
stack space */
|
||||
| { $$ = ATempty; }
|
||||
;
|
||||
|
||||
formals
|
||||
: formal ',' formals { $$ = ATinsert($3, $1); } /* idem - right recursive */
|
||||
| formal { $$ = ATinsert(ATempty, $1); }
|
||||
;
|
||||
|
||||
formal
|
||||
: ID { $$ = ATmake("NoDefFormal(<term>)", $1); }
|
||||
| ID '?' expr { $$ = ATmake("DefFormal(<term>, <term>)", $1, $3); }
|
||||
;
|
||||
|
||||
%%
|
||||
Loading…
Add table
Add a link
Reference in a new issue