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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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20
data/skeletons/lalr1.d
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@@ -139,11 +139,11 @@ static assert(__traits(compiles, (new string[1])[0]=(new ]b4_location_type[[1])[
private immutable bool yy_location_is_class = !__traits(compiles, *(new ]b4_location_type[((new ]b4_position_type[[1])[0])));]], [[
/**
* A class defining a pair of positions. Positions, defined by the
* <code>]b4_position_type[</code> class, denote a point in the input.
* A struct defining a pair of positions. Positions, defined by the
* <code>]b4_position_type[</code> struct, denote a point in the input.
* Locations represent a part of the input through the beginning
* and ending positions. */
public class ]b4_location_type[
public struct ]b4_location_type[
{
/** The first, inclusive, position in the range. */
public ]b4_position_type[ begin;
@@ -159,9 +159,6 @@ public class ]b4_location_type[
this.begin = this.end = loc;
}
public this () {
}
/**
* Create a <code>]b4_location_type[</code> from the endpoints of the range.
* @@param begin The first position included in the range.
@@ -173,10 +170,9 @@ public class ]b4_location_type[
}
/**
* A representation of the location. For this to be correct,
* <code>]b4_position_type[</code> should override the <code>toString</code>
* method. */
public override string toString () const {
* A representation of the location.
*/
public string toString () const {
auto end_col = 0 < end.column ? end.column - 1 : 0;
auto res = begin.toString ();
if (end.filename && begin.filename != end.filename)
@@ -189,7 +185,7 @@ public class ]b4_location_type[
}
}
private immutable bool yy_location_is_class = true;
private immutable bool yy_location_is_class = false;
]])])m4_ifdef([b4_user_union_members], [private union YYSemanticType
{
@@ -438,7 +434,7 @@ b4_symbol_type_define
/* Error handling. */
int yynerrs_ = 0;]b4_locations_if([[
/// The location where the error started.
]b4_location_type[ yyerrloc = null;
]b4_location_type[ yyerrloc;
/// ]b4_location_type[ of the lookahead.
]b4_location_type[ yylloc;