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* Optimise string constants by putting them in the symbol table.

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This commit is contained in:
Eelco Dolstra 2010-10-23 21:11:59 +00:00
parent 8ac06726b9
commit b2ba62170c
4 changed files with 55 additions and 39 deletions
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8
src/libexpr/lexer.l
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@ -46,7 +46,7 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
}
static Expr * unescapeStr(const char * s)
static Expr * unescapeStr(SymbolTable & symbols, const char * s)
{
string t;
char c;
@ -66,7 +66,7 @@ static Expr * unescapeStr(const char * s)
}
else t += c;
}
return new ExprString(t);
return new ExprString(symbols.create(t));
}
@ -119,7 +119,7 @@ inherit { return INHERIT; }
"$\"" will be consumed as part of a string, rather
than a "$" followed by the string terminator.
Disallow "$\"" for now. */
yylval->e = unescapeStr(yytext);
yylval->e = unescapeStr(data->symbols, yytext);
return STR;
}
<STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
@ -140,7 +140,7 @@ inherit { return INHERIT; }
return IND_STR;
}
<IND_STRING>\'\'\\. {
yylval->e = unescapeStr(yytext + 2);
yylval->e = unescapeStr(data->symbols, yytext + 2);
return IND_STR;
}
<IND_STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }