Correctly generate IR for casted "builtin" functions, where

the builtin is really just a predefined declaration.  These are
totally valid to cast.

llvm-svn: 139657

clang/lib/CodeGen/CGBuiltin.cpp

@@ -27,6 +27,30 @@ using namespace clang;
 using namespace CodeGen;
 using namespace llvm;
 
+/// getBuiltinLibFunction - Given a builtin id for a function like
+/// "__builtin_fabsf", return a Function* for "fabsf".
+llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
+                                                  unsigned BuiltinID) {
+  assert(Context.BuiltinInfo.isLibFunction(BuiltinID));
+
+  // Get the name, skip over the __builtin_ prefix (if necessary).
+  StringRef Name;
+  GlobalDecl D(FD);
+
+  // If the builtin has been declared explicitly with an assembler label,
+  // use the mangled name. This differs from the plain label on platforms
+  // that prefix labels.
+  if (FD->hasAttr<AsmLabelAttr>())
+    Name = getMangledName(D);
+  else
+    Name = Context.BuiltinInfo.GetName(BuiltinID) + 10;
+
+  llvm::FunctionType *Ty =
+    cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType()));
+
+  return GetOrCreateLLVMFunction(Name, Ty, D, /*ForVTable=*/false);
+}
+
 /// Emit the conversions required to turn the given value into an
 /// integer of the given size.
 static Value *EmitToInt(CodeGenFunction &CGF, llvm::Value *V,
@@ -142,6 +166,12 @@ static Value *EmitFAbs(CodeGenFunction &CGF, Value *V, QualType ValTy) {
   return CGF.Builder.CreateCall(Fn, V, "abs");
 }
 
+static RValue emitLibraryCall(CodeGenFunction &CGF, const FunctionDecl *Fn,
+                              const CallExpr *E, llvm::Value *calleeValue) {
+  return CGF.EmitCall(E->getCallee()->getType(), calleeValue,
+                      ReturnValueSlot(), E->arg_begin(), E->arg_end(), Fn);
+}
+
 RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
                                         unsigned BuiltinID, const CallExpr *E) {
   // See if we can constant fold this builtin.  If so, don't emit it at all.
@@ -1005,13 +1035,17 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
   }
   }
 
-  // If this is an alias for a libm function (e.g. __builtin_sin) turn it into
-  // that function.
-  if (getContext().BuiltinInfo.isLibFunction(BuiltinID) ||
-      getContext().BuiltinInfo.isPredefinedLibFunction(BuiltinID))
-    return EmitCall(E->getCallee()->getType(),
-                    CGM.getBuiltinLibFunction(FD, BuiltinID),
-                    ReturnValueSlot(), E->arg_begin(), E->arg_end(), FD);
+  // If this is an alias for a lib function (e.g. __builtin_sin), emit
+  // the call using the normal call path, but using the unmangled
+  // version of the function name.
+  if (getContext().BuiltinInfo.isLibFunction(BuiltinID))
+    return emitLibraryCall(*this, FD, E,
+                           CGM.getBuiltinLibFunction(FD, BuiltinID));
+  
+  // If this is a predefined lib function (e.g. malloc), emit the call
+  // using exactly the normal call path.
+  if (getContext().BuiltinInfo.isPredefinedLibFunction(BuiltinID))
+    return emitLibraryCall(*this, FD, E, EmitScalarExpr(E->getCallee()));
 
   // See if we have a target specific intrinsic.
   const char *Name = getContext().BuiltinInfo.GetName(BuiltinID);

clang/lib/CodeGen/CodeGenModule.cpp

@@ -27,7 +27,6 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/AST/Mangle.h"
 #include "clang/AST/RecordLayout.h"
-#include "clang/Basic/Builtins.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
@@ -1611,35 +1610,6 @@ void CodeGenModule::EmitAliasDefinition(GlobalDecl GD) {
   SetCommonAttributes(D, GA);
 }
 
-/// getBuiltinLibFunction - Given a builtin id for a function like
-/// "__builtin_fabsf", return a Function* for "fabsf".
-llvm::Value *CodeGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
-                                                  unsigned BuiltinID) {
-  assert((Context.BuiltinInfo.isLibFunction(BuiltinID) ||
-          Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) &&
-         "isn't a lib fn");
-
-  // Get the name, skip over the __builtin_ prefix (if necessary).
-  StringRef Name;
-  GlobalDecl D(FD);
-
-  // If the builtin has been declared explicitly with an assembler label,
-  // use the mangled name. This differs from the plain label on platforms
-  // that prefix labels.
-  if (FD->hasAttr<AsmLabelAttr>())
-    Name = getMangledName(D);
-  else if (Context.BuiltinInfo.isLibFunction(BuiltinID))
-    Name = Context.BuiltinInfo.GetName(BuiltinID) + 10;
-  else
-    Name = Context.BuiltinInfo.GetName(BuiltinID);
-
-
-  llvm::FunctionType *Ty =
-    cast<llvm::FunctionType>(getTypes().ConvertType(FD->getType()));
-
-  return GetOrCreateLLVMFunction(Name, Ty, D, /*ForVTable=*/false);
-}
-
 llvm::Function *CodeGenModule::getIntrinsic(unsigned IID,
                                             ArrayRef<llvm::Type*> Tys) {
   return llvm::Intrinsic::getDeclaration(&getModule(), (llvm::Intrinsic::ID)IID,

clang/test/CodeGenObjC/builtins.m

@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+
+void test0(id receiver, SEL sel, const char *str) {
+  short s = ((short (*)(id, SEL, const char*)) objc_msgSend)(receiver, sel, str);
+}
+// CHECK: define void @test0(
+// CHECK:   call signext i16 bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i16 (i8*, i8*, i8*)*)(