Mark __cfi_check as dso_local

[• espindola]

328825

lib/CodeGen/CGExpr.cpp

 // Emit a stub for __cfi_check function so that the linker knows about this
 // symbol in LTO mode.
 void CodeGenFunction::EmitCfiCheckStub() {
   llvm::Module *M = &CGM.getModule();
   auto &Ctx = M->getContext();
   llvm::Function *F = llvm::Function::Create(
       llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
       llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
+  CGM.setDSOLocal(F);
   llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
   // FIXME: consider emitting an intrinsic call like
   // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
   // which can be lowered in CrossDSOCFI pass to the actual contents of
   // __cfi_check. This would allow inlining of __cfi_check calls.
   llvm::CallInst::Create(
       llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
   llvm::ReturnInst::Create(Ctx, nullptr, BB);

test/CodeGen/cfi-icall-cross-dso.c

 }
 
 // CHECK: define {{(dso_local )?}}void @bar({{.*}} !type [[TNOPROTO:![0-9]+]] !type [[TNOPROTO_GENERALIZED:![0-9]+]] !type [[TNOPROTO_ID:![0-9]+]]
 // ITANIUM: define available_externally void @foo({{[^!]*$}}
 // MS: define linkonce_odr dso_local void @foo({{.*}} !type [[TNOPROTO]] !type [[TNOPROTO_GENERALIZED:![0-9]+]] !type [[TNOPROTO_ID]]
 inline void foo() {}
 void bar() { foo(); }
 
+// ITANIUM: define weak void @__cfi_check
+// MS: define weak dso_local void @__cfi_check
+
 // CHECK: !{i32 4, !"Cross-DSO CFI", i32 1}
 
 // Check that the type entries are correct.
 
 // ITANIUM: [[TVOID]] = !{i64 0, !"_ZTSFvvE"}
 // ITANIUM: [[TVOID_GENERALIZED]] = !{i64 0, !"_ZTSFvvE.generalized"}
 // ITANIUM: [[TVOID_ID]] = !{i64 0, i64 9080559750644022485}
 // ITANIUM: [[TNOPROTO]] = !{i64 0, !"_ZTSFvE"}