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[enh] Issue 10848 - Compiler should always try to inlining a direct lambda call #372

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Merged
andralex merged 2 commits into from
Dec 30, 2013
Merged

[enh] Issue 10848 - Compiler should always try to inlining a direct lambda call #372

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b0851f8
Improve the section for Lambda and Function Literal
9rnsr Aug 19, 2013
1d4a493
fix Issue 10848 - Compiler should always try to inlining a direct lam…
9rnsr Aug 19, 2013
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99 changes: 50 additions & 49 deletions expression.dd
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Original file line number Diff line number Diff line change
Expand Up @@ -1063,7 +1063,6 @@ $(GNAME PrimaryExpression):
$(GLINK StringLiterals)
$(GLINK ArrayLiteral)
$(GLINK AssocArrayLiteral)
$(GLINK Lambda)
$(GLINK FunctionLiteral)
$(GLINK AssertExpression)
$(GLINK MixinExpression)
Expand Down Expand Up @@ -1288,48 +1287,6 @@ $(GNAME ValueExpression):
are inserted as arguments in place of the tuple.
)

$(H4 Lambdas)

$(GRAMMAR
$(GNAME Lambda):
$(IDENTIFIER) $(D =>) $(GLINK AssignExpression)
$(D function)$(OPT) $(GLINK ParameterAttributes) $(D =>) $(GLINK AssignExpression)
$(D delegate)$(OPT) $(GLINK ParameterAttributes) $(D =>) $(GLINK AssignExpression)
)

$(P $(I Lambda)s are a shorthand syntax for $(GLINK FunctionLiteral)s.)

$(OL
$(LI $(P Just one $(IDENTIFIER) is rewritten to
$(GLINK2 declaration, Parameters):)

$(D $(LPAREN)) $(IDENTIFIER) $(D $(RPAREN))
)
$(LI $(P The following part $(D =>) $(I AssignExpression) is rewritten to
$(GLINK2 function, FunctionBody):)

$(D { return) $(I AssignExpression) $(D ; })
)
)

Example usage:
---
import std.stdio;

void main() {
auto i = 3;
auto twice = function (int x) => x * 2;
auto square = delegate (int x) => x * x;

auto n = 5;
auto mul_n = (int x) => x * n;

writeln(twice(i)); // prints 6
writeln(square(i)); // prints 9
writeln(mul_n(i)); // prints 15
}
---


$(H4 Function Literals)

Expand All @@ -1339,6 +1296,7 @@ $(GNAME FunctionLiteral):
$(D delegate) $(GLINK2 declaration, Type)$(OPT) $(GLINK ParameterAttributes) $(OPT) $(GLINK2 function, FunctionBody)
$(GLINK ParameterAttributes) $(GLINK2 function, FunctionBody)
$(GLINK2 function, FunctionBody)
$(GLINK Lambda)

$(GNAME ParameterAttributes):
$(GLINK2 declaration, Parameters)
Expand Down Expand Up @@ -1424,8 +1382,8 @@ $(GNAME ParameterAttributes):
}
-------------

If the type of a function literal can be uniquely determined from its context,
the parameter type inference is possible.
$(P If the type of a function literal can be uniquely determined from its context,
the parameter type inference is possible.)

-------------
void foo(int function(int) fp);
Expand All @@ -1439,8 +1397,8 @@ $(GNAME ParameterAttributes):
}
-------------

Anonymous delegates can behave like arbitrary statement literals.
For example, here an arbitrary statement is executed by a loop:
$(P Anonymous delegates can behave like arbitrary statement literals.
For example, here an arbitrary statement is executed by a loop:)

-------------
double test() {
Expand All @@ -1460,12 +1418,55 @@ $(GNAME ParameterAttributes):
}
-------------

When comparing with $(DDSUBLINK function, nested, nested functions),
$(P When comparing with $(DDSUBLINK function, nested, nested functions),
the $(D function) form is analogous to static
or non-nested functions, and the $(D delegate) form is
analogous to non-static nested functions. In other words,
a delegate literal can access stack variables in its enclosing
function, a function literal cannot.
function, a function literal cannot.)


$(H4 Lambdas)

$(GRAMMAR
$(GNAME Lambda):
$(IDENTIFIER) $(D =>) $(GLINK AssignExpression)
$(D function)$(OPT) $(GLINK ParameterAttributes) $(D =>) $(GLINK AssignExpression)
$(D delegate)$(OPT) $(GLINK ParameterAttributes) $(D =>) $(GLINK AssignExpression)
)

$(P $(I Lambda)s are a shorthand syntax for $(GLINK FunctionLiteral)s.)

$(OL
$(LI $(P Just one $(IDENTIFIER) is rewritten to
$(GLINK2 declaration, Parameters):)

$(D $(LPAREN)) $(IDENTIFIER) $(D $(RPAREN))
)
$(LI $(P The following part $(D =>) $(I AssignExpression) is rewritten to
$(GLINK2 function, FunctionBody):)

$(D { return) $(I AssignExpression) $(D ; })
)
)

Example usage:
---
import std.stdio;

void main() {
auto i = 3;
auto twice = function (int x) => x * 2;
auto square = delegate (int x) => x * x;

auto n = 5;
auto mul_n = (int x) => x * n;

writeln(twice(i)); // prints 6
writeln(square(i)); // prints 9
writeln(mul_n(i)); // prints 15
}
---


$(H4 Assert Expressions)
Expand Down
7 changes: 5 additions & 2 deletions function.dd
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Expand Up @@ -629,11 +629,14 @@ void main() {

$(H4 Inline Functions)

There is no inline keyword. The compiler makes the decision whether to
$(P There is no inline keyword. The compiler makes the decision whether to
inline a function or not, analogously to the register keyword no
longer being relevant to a
compiler's decisions on enregistering variables.
(There is no register keyword either.)
(There is no register keyword either.))

$(P If a $(GLINK2 expression, FunctionLiteral) is immediately called,
its inlining would be enforced normally.)


$(H3 $(LNAME2 function-overloading, Function Overloading))
Expand Down