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Sema/transparent_union: Make sure to add implicit cast when constructing 

implicit union values for the transparent_union extension.

llvm-svn: 114236
This commit is contained in:
Daniel Dunbar 2010-09-17 23:21:43 +00:00
parent 3586938d37
commit 60785eb0f2
2 changed files with 23 additions and 0 deletions
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1
clang/lib/Sema/SemaExpr.cpp
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@ -4954,6 +4954,7 @@ Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) {
if (CheckAssignmentConstraints(it->getType(), rExpr->getType())
== Compatible) {
ImpCastExprToType(rExpr, it->getType(), CK_Unknown);
InitField = *it;
break;
}

22
clang/test/CodeGen/transparent-union.c Normal file
View File

@ -0,0 +1,22 @@
// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -o %t %s
// RUN: FileCheck < %t %s
//
// FIXME: Note that we don't currently get the ABI right here. f0() should be
// f0(i8*).
typedef union {
void *f0;
} transp_t0 __attribute__((transparent_union));
void f0(transp_t0 obj);
// CHECK: define void @f1_0(i32* %a0)
// CHECK: call void @f0(%union.anon* byval %{{.*}})
// CHECK: }
void f1_0(int *a0) {
f0(a0);
}
void f1_1(int *a0) {
f0((transp_t0) { a0 });
}