Mercurial > projects > ldc
annotate gen/aa.h @ 1117:4c20fcc4252b
Fun with parameter attributes: For several of the "synthetic" parameters added
to D functions, we can apply noalias and nocapture. They are sret parameters,
'nest' pointers passed to nested functions, and _argptr:
Nocapture:
- Sret and nest are nocapture because they don't represent D-level variables,
and thus the callee can't (validly) obtain a pointer to them, let alone keep
it around after it returns.
- _argptr is nocapture because although the callee has access to it as a
pointer, that pointer is invalidated when it returns.
All three are noalias because they're function-local variables
- Sret and _argptr are noalias because they're freshly alloca'd memory only
used for a single function call that's not allowed to keep an aliasing
pointer to it around (since the parameter is nocapture).
- 'Nest' is noalias because the callee only ever has access to one such pointer
per parent function, and every parent function has a different one.
This commit also ensures attributes set on sret, _arguments and _argptr are
propagated to calls to such functions.
It also adds one exception to the general rule that attributes on function types
should propagate to calls: the type of a delegate's function pointer has a
'nest' parameter, but this can either be a true 'nest' (for delegates to nested
functions) or a 'this' (for delegates to member functions). Since 'this' is
neither noalias nor nocapture, and there's generally no way to tell which one it
is, we remove these attributes at the call site if the callee is a delegate.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Sat, 14 Mar 2009 22:15:31 +0100 |
parents | eef8ac26c66c |
children | 09734fb929c0 |
rev | line source |
---|---|
664
eef8ac26c66c
Some missed LLVMDC -> LDC.
Christian Kamm <kamm incasoftware de>
parents:
458
diff
changeset
|
1 #ifndef LDC_GEN_AA_H |
eef8ac26c66c
Some missed LLVMDC -> LDC.
Christian Kamm <kamm incasoftware de>
parents:
458
diff
changeset
|
2 #define LDC_GEN_AA_H |
109
5ab8e92611f9
[svn r113] Added initial support for associative arrays (AAs).
lindquist
parents:
diff
changeset
|
3 |
458
121624c14053
Fixed AA Rvalue-only access (like indexing an AA return value immediately).
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
399
diff
changeset
|
4 DValue* DtoAAIndex(Loc& loc, Type* type, DValue* aa, DValue* key, bool lvalue); |
399
0e6b4d65d3f8
Give error messages for invalid casts.
Christian Kamm <kamm incasoftware de>
parents:
127
diff
changeset
|
5 DValue* DtoAAIn(Loc& loc, Type* type, DValue* aa, DValue* key); |
0e6b4d65d3f8
Give error messages for invalid casts.
Christian Kamm <kamm incasoftware de>
parents:
127
diff
changeset
|
6 void DtoAARemove(Loc& loc, DValue* aa, DValue* key); |
109
5ab8e92611f9
[svn r113] Added initial support for associative arrays (AAs).
lindquist
parents:
diff
changeset
|
7 |
664
eef8ac26c66c
Some missed LLVMDC -> LDC.
Christian Kamm <kamm incasoftware de>
parents:
458
diff
changeset
|
8 #endif // LDC_GEN_AA_H |