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d: change YYLocation's type from class to struct

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This avoids heap allocation and gives minimal costs for the
creation and destruction of the YYParser.Symbol struct if
the location tracking is active.

Suggested by H. S. Teoh.

* data/skeletons/lalr1.d: Here.
* doc/bison.texi: Document it.
* examples/d/calc/calc.y: Adjust.
* tests/calc.at: Test it.
This commit is contained in:
Adela Vais
2020-11-19 23:03:56 +02:00
committed by Akim Demaille
parent 10305f3e94
commit e5854bbddd
4 changed files with 34 additions and 38 deletions
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18
examples/d/calc/calc.y
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@@ -127,7 +127,7 @@ if (isInputRange!R && is(ElementType!R : dchar))
}
if (input.empty)
return Calc.Symbol(TokenKind.YYEOF, new YYLocation(startPos, endPos));
return Calc.Symbol(TokenKind.YYEOF, YYLocation(startPos, endPos));
// Numbers.
if (input.front.isNumber)
@@ -143,7 +143,7 @@ if (isInputRange!R && is(ElementType!R : dchar))
}
start = end;
end.column += lenChars;
return Calc.Symbol(TokenKind.NUM, semanticVal_.ival, new YYLocation(startPos, endPos));
return Calc.Symbol(TokenKind.NUM, semanticVal_.ival, YYLocation(startPos, endPos));
}
// Individual characters
@@ -153,17 +153,17 @@ if (isInputRange!R && is(ElementType!R : dchar))
end.column++;
switch (ch)
{
case '+': return Calc.Symbol(TokenKind.PLUS, new YYLocation(startPos, endPos));
case '-': return Calc.Symbol(TokenKind.MINUS, new YYLocation(startPos, endPos));
case '*': return Calc.Symbol(TokenKind.STAR, new YYLocation(startPos, endPos));
case '/': return Calc.Symbol(TokenKind.SLASH, new YYLocation(startPos, endPos));
case '(': return Calc.Symbol(TokenKind.LPAR, new YYLocation(startPos, endPos));
case ')': return Calc.Symbol(TokenKind.RPAR, new YYLocation(startPos, endPos));
case '+': return Calc.Symbol(TokenKind.PLUS, YYLocation(startPos, endPos));
case '-': return Calc.Symbol(TokenKind.MINUS, YYLocation(startPos, endPos));
case '*': return Calc.Symbol(TokenKind.STAR, YYLocation(startPos, endPos));
case '/': return Calc.Symbol(TokenKind.SLASH, YYLocation(startPos, endPos));
case '(': return Calc.Symbol(TokenKind.LPAR, YYLocation(startPos, endPos));
case ')': return Calc.Symbol(TokenKind.RPAR, YYLocation(startPos, endPos));
case '\n':
{
end.line++;
end.column = 1;
return Calc.Symbol(TokenKind.EOL, new YYLocation(startPos, endPos));
return Calc.Symbol(TokenKind.EOL, YYLocation(startPos, endPos));
}
default: assert(0);
}