When evaluating variably modified types for function parameters, dig out the
type as written from the ParmVarDecl; it's unclear whether the standard
(C99 6.9.1p10) requires this, but we're following the precedent set by gcc,
and hopefully nobody will ever ask about this again.
PR9559 / <rdar://problem/12621983>.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167985 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 18f1623..d7ccfc9 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -454,7 +454,16 @@
// emit the type size.
for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
i != e; ++i) {
- QualType Ty = (*i)->getType();
+ const VarDecl *VD = *i;
+
+ // Dig out the type as written from ParmVarDecls; it's unclear whether
+ // the standard (C99 6.9.1p10) requires this, but we're following the
+ // precedent set by gcc.
+ QualType Ty;
+ if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD))
+ Ty = PVD->getOriginalType();
+ else
+ Ty = VD->getType();
if (Ty->isVariablyModifiedType())
EmitVariablyModifiedType(Ty);
diff --git a/test/CodeGen/vla.c b/test/CodeGen/vla.c
index e151827..f63796b 100644
--- a/test/CodeGen/vla.c
+++ b/test/CodeGen/vla.c
@@ -190,4 +190,8 @@
// CHECK-NEXT: store i32 0, i32* [[IX2]], align 4
}
-
+// Follow gcc's behavior for VLAs in parameter lists. PR9559.
+void test7(int a[b(0)]) {
+ // CHECK: define void @test7(
+ // CHECK: call i32 @b(i8* null)
+}
