Convert some ObjC msgSends to runtime calls.

It is faster to directly call the ObjC runtime for methods such as retain/release instead of sending a message to those functions.

This patch adds support for converting messages to retain/release/alloc/autorelease to their equivalent runtime calls.

Tests included for the positive case of applying this transformation, negative tests that we ensure we only convert "alloc" to objc_alloc, not "alloc2", and also a driver test to ensure we enable this only for supported runtime versions.

Reviewed by John McCall.

Differential Revision: http://reviews.llvm.org/D14737

llvm-svn: 263607

1 files changed, 6 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 85d5f7a..8a4abbf 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -2821,11 +2821,13 @@ public:
   llvm::Value *EmitARCStoreStrongCall(Address addr, llvm::Value *value,
                                       bool resultIgnored);
   llvm::Value *EmitARCRetain(QualType type, llvm::Value *value);
-  llvm::Value *EmitARCRetainNonBlock(llvm::Value *value);
+  llvm::Value *EmitARCRetainNonBlock(llvm::Value *value,
+                                     llvm::Type *returnType = nullptr);
   llvm::Value *EmitARCRetainBlock(llvm::Value *value, bool mandatory);
   void EmitARCDestroyStrong(Address addr, ARCPreciseLifetime_t precise);
   void EmitARCRelease(llvm::Value *value, ARCPreciseLifetime_t precise);
-  llvm::Value *EmitARCAutorelease(llvm::Value *value);
+  llvm::Value *EmitARCAutorelease(llvm::Value *value,
+                                  llvm::Type *returnType = nullptr);
   llvm::Value *EmitARCAutoreleaseReturnValue(llvm::Value *value);
   llvm::Value *EmitARCRetainAutoreleaseReturnValue(llvm::Value *value);
   llvm::Value *EmitARCRetainAutoreleasedReturnValue(llvm::Value *value);
@@ -2838,6 +2840,8 @@ public:
   std::pair<LValue,llvm::Value*>
   EmitARCStoreUnsafeUnretained(const BinaryOperator *e, bool ignored);
 
+  llvm::Value *EmitObjCAlloc(llvm::Value *value,
+                             llvm::Type *returnType = nullptr);
   llvm::Value *EmitObjCThrowOperand(const Expr *expr);
   llvm::Value *EmitObjCConsumeObject(QualType T, llvm::Value *Ptr);
   llvm::Value *EmitObjCExtendObjectLifetime(QualType T, llvm::Value *Ptr);