From 7ec8375cec3f32c6bd03d22cced09d2b39e15cf1 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@apple.com>
Date: Mon, 16 Apr 2018 19:53:59 +0000
Subject: [PATCH] Revert "[CodeGen] Fix a crash that occurs when a non-trivial
 C struct with a"

This reverts commit r330151, which caused bots to fail.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330153 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGNonTrivialStruct.cpp    | 40 ++++++++++-----------------
 test/CodeGenObjC/strong-in-c-struct.m | 18 ------------
 2 files changed, 15 insertions(+), 43 deletions(-)

diff --git a/lib/CodeGen/CGNonTrivialStruct.cpp b/lib/CodeGen/CGNonTrivialStruct.cpp
index 4f1708497b..731938af86 100644
--- a/lib/CodeGen/CGNonTrivialStruct.cpp
+++ b/lib/CodeGen/CGNonTrivialStruct.cpp
@@ -21,11 +21,10 @@ using namespace clang;
 using namespace CodeGen;
 
 // Return the size of a field in number of bits.
-static uint64_t getFieldSize(const FieldDecl *FD, QualType FT,
-                             ASTContext &Ctx) {
-  if (FD && FD->isBitField())
+static uint64_t getFieldSize(const FieldDecl *FD, ASTContext &Ctx) {
+  if (FD->isBitField())
     return FD->getBitWidthValue(Ctx);
-  return Ctx.getTypeSize(FT);
+  return Ctx.getTypeSize(FD->getType());
 }
 
 namespace {
@@ -188,7 +187,7 @@ struct CopyStructVisitor : StructVisitor<Derived>,
                     Ts... Args) {
     assert(!FT.isVolatileQualified() && "volatile field not expected");
     ASTContext &Ctx = asDerived().getContext();
-    uint64_t FieldSize = getFieldSize(FD, FT, Ctx);
+    uint64_t FieldSize = getFieldSize(FD, Ctx);
 
     // Ignore zero-sized fields.
     if (FieldSize == 0)
@@ -337,7 +336,7 @@ struct GenBinaryFuncName : CopyStructVisitor<GenBinaryFuncName<IsMove>, IsMove>,
     uint64_t OffsetInBits =
         this->Ctx.toBits(CurStackOffset) + this->getFieldOffsetInBits(FD);
     this->appendStr("_tv" + llvm::to_string(OffsetInBits) + "w" +
-                    llvm::to_string(getFieldSize(FD, FT, this->Ctx)));
+                    llvm::to_string(getFieldSize(FD, this->Ctx)));
   }
 };
 
@@ -596,25 +595,16 @@ struct GenBinaryFunc : CopyStructVisitor<Derived, IsMove>,
   template <class... Ts>
   void visitVolatileTrivial(QualType FT, const FieldDecl *FD, CharUnits Offset,
                             std::array<Address, 2> Addrs) {
-    LValue DstLV, SrcLV;
-    if (FD) {
-      QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
-      llvm::PointerType *PtrTy = this->CGF->ConvertType(RT)->getPointerTo();
-      Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
-      LValue DstBase = this->CGF->MakeAddrLValue(
-          this->CGF->Builder.CreateBitCast(DstAddr, PtrTy), FT);
-      DstLV = this->CGF->EmitLValueForField(DstBase, FD);
-      Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
-      LValue SrcBase = this->CGF->MakeAddrLValue(
-          this->CGF->Builder.CreateBitCast(SrcAddr, PtrTy), FT);
-      SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
-    } else {
-      llvm::PointerType *Ty = this->CGF->ConvertType(FT)->getPointerTo();
-      Address DstAddr = this->CGF->Builder.CreateBitCast(Addrs[DstIdx], Ty);
-      Address SrcAddr = this->CGF->Builder.CreateBitCast(Addrs[SrcIdx], Ty);
-      DstLV = this->CGF->MakeAddrLValue(DstAddr, FT);
-      SrcLV = this->CGF->MakeAddrLValue(SrcAddr, FT);
-    }
+    QualType RT = QualType(FD->getParent()->getTypeForDecl(), 0);
+    llvm::PointerType *PtrTy = this->CGF->ConvertType(RT)->getPointerTo();
+    Address DstAddr = this->getAddrWithOffset(Addrs[DstIdx], Offset);
+    LValue DstBase = this->CGF->MakeAddrLValue(
+        this->CGF->Builder.CreateBitCast(DstAddr, PtrTy), FT);
+    LValue DstLV = this->CGF->EmitLValueForField(DstBase, FD);
+    Address SrcAddr = this->getAddrWithOffset(Addrs[SrcIdx], Offset);
+    LValue SrcBase = this->CGF->MakeAddrLValue(
+        this->CGF->Builder.CreateBitCast(SrcAddr, PtrTy), FT);
+    LValue SrcLV = this->CGF->EmitLValueForField(SrcBase, FD);
     RValue SrcVal = this->CGF->EmitLoadOfLValue(SrcLV, SourceLocation());
     this->CGF->EmitStoreThroughLValue(SrcVal, DstLV);
   }
diff --git a/test/CodeGenObjC/strong-in-c-struct.m b/test/CodeGenObjC/strong-in-c-struct.m
index 393a328ca8..6310943d2e 100644
--- a/test/CodeGenObjC/strong-in-c-struct.m
+++ b/test/CodeGenObjC/strong-in-c-struct.m
@@ -70,11 +70,6 @@ typedef struct {
   volatile char i6;
 } Bitfield1;
 
-typedef struct {
-  id x;
-  volatile int a[16];
-} VolatileArray ;
-
 #endif
 
 #ifdef USESTRUCT
@@ -545,17 +540,4 @@ void test_strong_in_union() {
   U t;
 }
 
-// CHECK: define void @test_copy_constructor_VolatileArray(
-// CHECK: call void @__copy_constructor_8_8_s0_AB8s4n16_tv64w32_AE(
-
-// CHECK: define linkonce_odr hidden void @__copy_constructor_8_8_s0_AB8s4n16_tv64w32_AE(
-// CHECK: %[[V12:.*]] = bitcast i8** %{{.*}} to i32*
-// CHECK: %[[V13:.*]] = bitcast i8** %{{.*}} to i32*
-// CHECK: %[[V14:.*]] = load volatile i32, i32* %[[V13]], align 4
-// CHECK: store volatile i32 %[[V14]], i32* %[[V12]], align 4
-
-void test_copy_constructor_VolatileArray(VolatileArray *a) {
-  VolatileArray t = *a;
-}
-
 #endif /* USESTRUCT */
-- 
2.40.0