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view gen/linkage.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> |
---|---|
date | Sat, 14 Mar 2009 22:15:31 +0100 |
parents | 123812e02bc8 |
children | 3647bef175d7 |
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#ifndef LDC_GEN_LINKAGE_H #define LDC_GEN_LINKAGE_H #include "gen/llvm-version.h" // Make it easier to test new linkage types // Also used to adapt to some changes in LLVM between 2.5 and 2.6 // LLVM r66339 introduces LinkOnceODRLinkage, which is just what we want here. // (It also renamed LinkOnceLinkage, so this #if is needed for LDC to compile // with both 2.5 and trunk) #if LLVM_REV >= 66339 # define TEMPLATE_LINKAGE_TYPE llvm::GlobalValue::LinkOnceODRLinkage # define TYPEINFO_LINKAGE_TYPE llvm::GlobalValue::LinkOnceODRLinkage // The One-Definition-Rule shouldn't matter for debug info, right? # define DEBUGINFO_LINKONCE_LINKAGE_TYPE \ llvm::GlobalValue::LinkOnceAnyLinkage // For 2.5 and any LLVM revision before 66339 we want to use LinkOnceLinkage // It's equivalent to LinkOnceAnyLinkage in trunk except that the inliner had a // hack (removed in r66339) to allow inlining of templated functions even though // LinkOnce doesn't technically allow that. #else # define TEMPLATE_LINKAGE_TYPE llvm::GlobalValue::LinkOnceLinkage # define TYPEINFO_LINKAGE_TYPE llvm::GlobalValue::LinkOnceLinkage # define DEBUGINFO_LINKONCE_LINKAGE_TYPE \ llvm::GlobalValue::LinkOnceLinkage #endif #endif