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CodeGen: Don't emit linkage on thunks that aren't emitted because they're vararg. 

This can happen when we're trying to emit a thunk with available_externally
linkage with optimization enabled but bail because it doesn't make sense
for vararg functions.

PR18098.

llvm-svn: 196658
This commit is contained in:
Benjamin Kramer 2013-12-07 16:12:52 +00:00
parent c108676822
commit 065c61b646
2 changed files with 26 additions and 3 deletions
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7
clang/lib/CodeGen/CGVTables.cpp
View File

@ -422,14 +422,15 @@ void CodeGenVTables::emitThunk(GlobalDecl GD, const ThunkInfo &Thunk,
// expensive/sucky at the moment, so don't generate the thunk unless // expensive/sucky at the moment, so don't generate the thunk unless
// we have to. // we have to.
// FIXME: Do something better here; GenerateVarArgsThunk is extremely ugly. // FIXME: Do something better here; GenerateVarArgsThunk is extremely ugly.
if (!UseAvailableExternallyLinkage) if (!UseAvailableExternallyLinkage) {
CodeGenFunction(CGM).GenerateVarArgsThunk(ThunkFn, FnInfo, GD, Thunk); CodeGenFunction(CGM).GenerateVarArgsThunk(ThunkFn, FnInfo, GD, Thunk);
CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
}
} else { } else {
// Normal thunk body generation. // Normal thunk body generation.
CodeGenFunction(CGM).GenerateThunk(ThunkFn, FnInfo, GD, Thunk); CodeGenFunction(CGM).GenerateThunk(ThunkFn, FnInfo, GD, Thunk);
CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
} }
CGM.getCXXABI().setThunkLinkage(ThunkFn, ForVTable);
} }
void CodeGenVTables::maybeEmitThunkForVTable(GlobalDecl GD, void CodeGenVTables::maybeEmitThunkForVTable(GlobalDecl GD,

22
clang/test/CodeGenCXX/thunks.cpp
View File

@ -1,4 +1,5 @@
// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -emit-llvm -o - | FileCheck %s // RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -emit-llvm -o - -O1 -disable-llvm-optzns | FileCheck %s
// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -fhidden-weak-vtables -emit-llvm -o - | FileCheck -check-prefix=CHECK-HIDDEN %s // RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -munwind-tables -fhidden-weak-vtables -emit-llvm -o - | FileCheck -check-prefix=CHECK-HIDDEN %s
namespace Test1 { namespace Test1 {
@ -342,6 +343,27 @@ namespace Test14 {
// CHECK: define void @_ZThn8_N6Test141C1fEv({{.*}}) unnamed_addr [[NUW:#[0-9]+]] // CHECK: define void @_ZThn8_N6Test141C1fEv({{.*}}) unnamed_addr [[NUW:#[0-9]+]]
} }
// Varargs non-covariant thunk test.
// PR18098
namespace Test15 {
struct A {
virtual ~A();
};
struct B {
virtual void f(int x, ...);
};
struct C : A, B {
virtual void c();
virtual void f(int x, ...);
};
void C::c() {}
// C::c
// CHECK: declare void @_ZN6Test151C1fEiz
// non-virtual thunk to C::f
// CHECK: declare void @_ZThn8_N6Test151C1fEiz
}
/**** The following has to go at the end of the file ****/ /**** The following has to go at the end of the file ****/
// This is from Test5: // This is from Test5: