From: David Majnemer <david.majnemer@gmail.com>
Date: Fri, 24 Apr 2015 01:25:05 +0000 (+0000)
Subject: [MS ABI] Fix the preferred alignment of member pointers
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e154456d4a7243fef84f66817b23fcb51790880d;p=platform%2Fupstream%2Fllvm.git

[MS ABI] Fix the preferred alignment of member pointers

Member pointers in the MS ABI have different alignment depending on
whether they were created on the stack or live in a record.

llvm-svn: 235681
---

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 4d6a51b..0fc9a4e 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -1797,11 +1797,16 @@ unsigned ASTContext::getPreferredTypeAlign(const Type *T) const {
   TypeInfo TI = getTypeInfo(T);
   unsigned ABIAlign = TI.Align;
 
+  T = T->getBaseElementTypeUnsafe();
+
+  // The preferred alignment of member pointers is that of a pointer.
+  if (T->isMemberPointerType())
+    return getPreferredTypeAlign(getPointerDiffType().getTypePtr());
+
   if (Target->getTriple().getArch() == llvm::Triple::xcore)
     return ABIAlign;  // Never overalign on XCore.
 
   // Double and long long should be naturally aligned if possible.
-  T = T->getBaseElementTypeUnsafe();
   if (const ComplexType *CT = T->getAs<ComplexType>())
     T = CT->getElementType().getTypePtr();
   if (const EnumType *ET = T->getAs<EnumType>())
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index d82c58f..2e180c9 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -1813,8 +1813,7 @@ void CodeGenFunction::EmitFunctionProlog(const CGFunctionInfo &FI,
         ArgVals.push_back(ValueAndIsPtr(V, HavePointer));
       } else {
         // Load scalar value from indirect argument.
-        CharUnits Alignment = getContext().getTypeAlignInChars(Ty);
-        V = EmitLoadOfScalar(V, false, Alignment.getQuantity(), Ty,
+        V = EmitLoadOfScalar(V, false, ArgI.getIndirectAlign(), Ty,
                              Arg->getLocStart());
 
         if (isPromoted)
diff --git a/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp b/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp
index f1bff39..c12ceae 100644
--- a/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp
+++ b/clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp
@@ -80,20 +80,20 @@ int UnspecSingle::*us_d_memptr;
 // CHECK: @"\01?p_d_memptr@@3PQPolymorphic@@HQ1@" = global i32 0, align 4
 // CHECK: @"\01?m_d_memptr@@3PQMultiple@@HQ1@" = global i32 -1, align 4
 // CHECK: @"\01?v_d_memptr@@3PQVirtual@@HQ1@" = global { i32, i32 }
-// CHECK:   { i32 0, i32 -1 }, align 8
+// CHECK:   { i32 0, i32 -1 }, align 4
 // CHECK: @"\01?n_d_memptr@@3PQNonZeroVBPtr@@HQ1@" = global { i32, i32 }
-// CHECK:   { i32 0, i32 -1 }, align 8
+// CHECK:   { i32 0, i32 -1 }, align 4
 // CHECK: @"\01?u_d_memptr@@3PQUnspecified@@HQ1@" = global { i32, i32, i32 }
-// CHECK:   { i32 0, i32 0, i32 -1 }, align 8
+// CHECK:   { i32 0, i32 0, i32 -1 }, align 4
 // CHECK: @"\01?us_d_memptr@@3PQUnspecSingle@@HQ1@" = global { i32, i32, i32 }
-// CHECK:   { i32 0, i32 0, i32 -1 }, align 8
+// CHECK:   { i32 0, i32 0, i32 -1 }, align 4
 
 void (Single  ::*s_f_memptr)();
 void (Multiple::*m_f_memptr)();
 void (Virtual ::*v_f_memptr)();
 // CHECK: @"\01?s_f_memptr@@3P8Single@@AEXXZQ1@" = global i8* null, align 4
-// CHECK: @"\01?m_f_memptr@@3P8Multiple@@AEXXZQ1@" = global { i8*, i32 } zeroinitializer, align 8
-// CHECK: @"\01?v_f_memptr@@3P8Virtual@@AEXXZQ1@" = global { i8*, i32, i32 } zeroinitializer, align 8
+// CHECK: @"\01?m_f_memptr@@3P8Multiple@@AEXXZQ1@" = global { i8*, i32 } zeroinitializer, align 4
+// CHECK: @"\01?v_f_memptr@@3P8Virtual@@AEXXZQ1@" = global { i8*, i32, i32 } zeroinitializer, align 4
 
 // We can define Unspecified after locking in the inheritance model.
 struct Unspecified : Multiple, Virtual {
@@ -115,13 +115,13 @@ void (UnspecSingle::*us_f_mp)() = &UnspecSingle::foo;
 // CHECK: @"\01?s_f_mp@Const@@3P8Single@@AEXXZQ2@" =
 // CHECK:   global i8* bitcast ({{.*}} @"\01?foo@Single@@QAEXXZ" to i8*), align 4
 // CHECK: @"\01?m_f_mp@Const@@3P8Multiple@@AEXXZQ2@" =
-// CHECK:   global { i8*, i32 } { i8* bitcast ({{.*}} @"\01?foo@B2@@QAEXXZ" to i8*), i32 4 }, align 8
+// CHECK:   global { i8*, i32 } { i8* bitcast ({{.*}} @"\01?foo@B2@@QAEXXZ" to i8*), i32 4 }, align 4
 // CHECK: @"\01?v_f_mp@Const@@3P8Virtual@@AEXXZQ2@" =
-// CHECK:   global { i8*, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@Virtual@@QAEXXZ" to i8*), i32 0, i32 0 }, align 8
+// CHECK:   global { i8*, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@Virtual@@QAEXXZ" to i8*), i32 0, i32 0 }, align 4
 // CHECK: @"\01?u_f_mp@Const@@3P8Unspecified@@AEXXZQ2@" =
-// CHECK:   global { i8*, i32, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@Unspecified@@QAEXXZ" to i8*), i32 0, i32 12, i32 0 }, align 8
+// CHECK:   global { i8*, i32, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@Unspecified@@QAEXXZ" to i8*), i32 0, i32 12, i32 0 }, align 4
 // CHECK: @"\01?us_f_mp@Const@@3P8UnspecSingle@@AEXXZQ2@" =
-// CHECK:   global { i8*, i32, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@UnspecSingle@@QAEXXZ" to i8*), i32 0, i32 0, i32 0 }, align 8
+// CHECK:   global { i8*, i32, i32, i32 } { i8* bitcast ({{.*}} @"\01?foo@UnspecSingle@@QAEXXZ" to i8*), i32 0, i32 0, i32 0 }, align 4
 }
 
 namespace CastParam {
@@ -143,11 +143,11 @@ void (A::*ptr1)(void *) = (void (A::*)(void *)) &A::foo;
 // Try a reinterpret_cast followed by a memptr conversion.
 void (C::*ptr2)(void *) = (void (C::*)(void *)) (void (A::*)(void *)) &A::foo;
 // CHECK: @"\01?ptr2@CastParam@@3P8C@1@AEXPAX@ZQ21@" =
-// CHECK:   global { i8*, i32 } { i8* bitcast (void ({{.*}})* @"\01?foo@A@CastParam@@QAEXPAU12@@Z" to i8*), i32 4 }, align 8
+// CHECK:   global { i8*, i32 } { i8* bitcast (void ({{.*}})* @"\01?foo@A@CastParam@@QAEXPAU12@@Z" to i8*), i32 4 }, align 4
 
 void (C::*ptr3)(void *) = (void (C::*)(void *)) (void (A::*)(void *)) (void (A::*)(A *)) 0;
 // CHECK: @"\01?ptr3@CastParam@@3P8C@1@AEXPAX@ZQ21@" =
-// CHECK:   global { i8*, i32 } zeroinitializer, align 8
+// CHECK:   global { i8*, i32 } zeroinitializer, align 4
 
 struct D : C {
   virtual void isPolymorphic();
@@ -180,23 +180,23 @@ void EmitNonVirtualMemberPointers() {
   void (UnspecWithVBPtr::*u2_f_memptr)() = &UnspecWithVBPtr::foo;
 // CHECK: define void @"\01?EmitNonVirtualMemberPointers@@YAXXZ"() {{.*}} {
 // CHECK:   alloca i8*, align 4
-// CHECK:   alloca { i8*, i32 }, align 8
-// CHECK:   alloca { i8*, i32, i32 }, align 8
-// CHECK:   alloca { i8*, i32, i32, i32 }, align 8
+// CHECK:   alloca { i8*, i32 }, align 4
+// CHECK:   alloca { i8*, i32, i32 }, align 4
+// CHECK:   alloca { i8*, i32, i32, i32 }, align 4
 // CHECK:   store i8* bitcast (void (%{{.*}}*)* @"\01?foo@Single@@QAEXXZ" to i8*), i8** %{{.*}}, align 4
 // CHECK:   store { i8*, i32 }
 // CHECK:     { i8* bitcast (void (%{{.*}}*)* @"\01?foo@Multiple@@QAEXXZ" to i8*), i32 0 },
-// CHECK:     { i8*, i32 }* %{{.*}}, align 8
+// CHECK:     { i8*, i32 }* %{{.*}}, align 4
 // CHECK:   store { i8*, i32, i32 }
 // CHECK:     { i8* bitcast (void (%{{.*}}*)* @"\01?foo@Virtual@@QAEXXZ" to i8*), i32 0, i32 0 },
-// CHECK:     { i8*, i32, i32 }* %{{.*}}, align 8
+// CHECK:     { i8*, i32, i32 }* %{{.*}}, align 4
 // CHECK:   store { i8*, i32, i32, i32 }
 // CHECK:     { i8* bitcast (void (%{{.*}}*)* @"\01?foo@Unspecified@@QAEXXZ" to i8*), i32 0, i32 12, i32 0 },
-// CHECK:     { i8*, i32, i32, i32 }* %{{.*}}, align 8
+// CHECK:     { i8*, i32, i32, i32 }* %{{.*}}, align 4
 // CHECK:   store { i8*, i32, i32, i32 }
 // CHECK:     { i8* bitcast (void (%{{.*}}*)* @"\01?foo@UnspecWithVBPtr@@QAEXXZ" to i8*),
 // CHECK:       i32 0, i32 4, i32 0 },
-// CHECK:     { i8*, i32, i32, i32 }* %{{.*}}, align 8
+// CHECK:     { i8*, i32, i32, i32 }* %{{.*}}, align 4
 // CHECK:   ret void
 // CHECK: }
 }
@@ -243,9 +243,9 @@ void polymorphicMemPtrs() {
 bool nullTestDataUnspecified(int Unspecified::*mp) {
   return mp;
 // CHECK: define zeroext i1 @"\01?nullTestDataUnspecified@@YA_NPQUnspecified@@H@Z"{{.*}} {
-// CHECK:   %{{.*}} = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 8
-// CHECK:   store { i32, i32, i32 } {{.*}} align 8
-// CHECK:   %[[mp:.*]] = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 8
+// CHECK:   %{{.*}} = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 4
+// CHECK:   store { i32, i32, i32 } {{.*}} align 4
+// CHECK:   %[[mp:.*]] = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 4
 // CHECK:   %[[mp0:.*]] = extractvalue { i32, i32, i32 } %[[mp]], 0
 // CHECK:   %[[cmp0:.*]] = icmp ne i32 %[[mp0]], 0
 // CHECK:   %[[mp1:.*]] = extractvalue { i32, i32, i32 } %[[mp]], 1
@@ -265,9 +265,9 @@ bool nullTestDataUnspecified(int Unspecified::*mp) {
 bool nullTestFunctionUnspecified(void (Unspecified::*mp)()) {
   return mp;
 // CHECK: define zeroext i1 @"\01?nullTestFunctionUnspecified@@YA_NP8Unspecified@@AEXXZ@Z"{{.*}} {
-// CHECK:   %{{.*}} = load { i8*, i32, i32, i32 }, { i8*, i32, i32, i32 }* %{{.*}}, align 8
-// CHECK:   store { i8*, i32, i32, i32 } {{.*}} align 8
-// CHECK:   %[[mp:.*]] = load { i8*, i32, i32, i32 }, { i8*, i32, i32, i32 }* %{{.*}}, align 8
+// CHECK:   %{{.*}} = load { i8*, i32, i32, i32 }, { i8*, i32, i32, i32 }* %{{.*}}, align 4
+// CHECK:   store { i8*, i32, i32, i32 } {{.*}} align 4
+// CHECK:   %[[mp:.*]] = load { i8*, i32, i32, i32 }, { i8*, i32, i32, i32 }* %{{.*}}, align 4
 // CHECK:   %[[mp0:.*]] = extractvalue { i8*, i32, i32, i32 } %[[mp]], 0
 // CHECK:   %[[cmp0:.*]] = icmp ne i8* %[[mp0]], null
 // CHECK:   ret i1 %[[cmp0]]
@@ -280,7 +280,7 @@ int loadDataMemberPointerVirtual(Virtual *o, int Virtual::*memptr) {
 // data pointer.
 // CHECK: define i32 @"\01?loadDataMemberPointerVirtual@@YAHPAUVirtual@@PQ1@H@Z"{{.*}} {
 // CHECK:   %[[o:.*]] = load %{{.*}}*, %{{.*}}** %{{.*}}, align 4
-// CHECK:   %[[memptr:.*]] = load { i32, i32 }, { i32, i32 }* %{{.*}}, align 8
+// CHECK:   %[[memptr:.*]] = load { i32, i32 }, { i32, i32 }* %{{.*}}, align 4
 // CHECK:   %[[memptr0:.*]] = extractvalue { i32, i32 } %[[memptr:.*]], 0
 // CHECK:   %[[memptr1:.*]] = extractvalue { i32, i32 } %[[memptr:.*]], 1
 // CHECK:   %[[v6:.*]] = bitcast %{{.*}}* %[[o]] to i8*
@@ -309,7 +309,7 @@ int loadDataMemberPointerUnspecified(Unspecified *o, int Unspecified::*memptr) {
 // data pointer.
 // CHECK: define i32 @"\01?loadDataMemberPointerUnspecified@@YAHPAUUnspecified@@PQ1@H@Z"{{.*}} {
 // CHECK:   %[[o:.*]] = load %{{.*}}*, %{{.*}}** %{{.*}}, align 4
-// CHECK:   %[[memptr:.*]] = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 8
+// CHECK:   %[[memptr:.*]] = load { i32, i32, i32 }, { i32, i32, i32 }* %{{.*}}, align 4
 // CHECK:   %[[memptr0:.*]] = extractvalue { i32, i32, i32 } %[[memptr:.*]], 0
 // CHECK:   %[[memptr1:.*]] = extractvalue { i32, i32, i32 } %[[memptr:.*]], 1
 // CHECK:   %[[memptr2:.*]] = extractvalue { i32, i32, i32 } %[[memptr:.*]], 2
@@ -509,7 +509,7 @@ void (B2::*convertMultipleFuncToB2(void (Multiple::*mp)()))() {
 //
 // CHECK: define i32 @"\01?convertMultipleFuncToB2@@YAP8B2@@AEXXZP8Multiple@@AEXXZ@Z"{{.*}} {
 // CHECK:   store
-// CHECK:   %[[src:.*]] = load { i8*, i32 }, { i8*, i32 }* %{{.*}}, align 8
+// CHECK:   %[[src:.*]] = load { i8*, i32 }, { i8*, i32 }* %{{.*}}, align 4
 // CHECK:   extractvalue { i8*, i32 } %[[src]], 0
 // CHECK:   icmp ne i8* %{{.*}}, null
 // CHECK:   br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
@@ -534,7 +534,7 @@ void (D::*convertCToD(void (C::*mp)()))() {
   return mp;
 // CHECK: define void @"\01?convertCToD@Test1@@YAP8D@1@AEXXZP8C@1@AEXXZ@Z"{{.*}} {
 // CHECK:   store
-// CHECK:   load { i8*, i32, i32 }, { i8*, i32, i32 }* %{{.*}}, align 8
+// CHECK:   load { i8*, i32, i32 }, { i8*, i32, i32 }* %{{.*}}, align 4
 // CHECK:   extractvalue { i8*, i32, i32 } %{{.*}}, 0
 // CHECK:   icmp ne i8* %{{.*}}, null
 // CHECK:   br i1 %{{.*}}, label %{{.*}}, label %{{.*}}
diff --git a/clang/test/SemaCXX/member-pointer-ms.cpp b/clang/test/SemaCXX/member-pointer-ms.cpp
index 39cf601..83aeb01 100644
--- a/clang/test/SemaCXX/member-pointer-ms.cpp
+++ b/clang/test/SemaCXX/member-pointer-ms.cpp
@@ -93,15 +93,15 @@ static_assert(sizeof(void (IncSingle::*)())   == kSingleFunctionSize, "");
 static_assert(sizeof(void (IncMultiple::*)()) == kMultipleFunctionSize, "");
 static_assert(sizeof(void (IncVirtual::*)())  == kVirtualFunctionSize, "");
 
-static_assert(__alignof(int IncSingle::*)        == kSingleDataAlign, "");
-static_assert(__alignof(int IncMultiple::*)      == kMultipleDataAlign, "");
-static_assert(__alignof(int IncVirtual::*)       == kVirtualDataAlign, "");
-static_assert(__alignof(void (IncSingle::*)())   == kSingleFunctionAlign, "");
-static_assert(__alignof(void (IncMultiple::*)()) == kMultipleFunctionAlign, "");
-static_assert(__alignof(void (IncVirtual::*)())  == kVirtualFunctionAlign, "");
+static_assert(__alignof(int IncSingle::*)        == __alignof(void *), "");
+static_assert(__alignof(int IncMultiple::*)      == __alignof(void *), "");
+static_assert(__alignof(int IncVirtual::*)       == __alignof(void *), "");
+static_assert(__alignof(void (IncSingle::*)())   == __alignof(void *), "");
+static_assert(__alignof(void (IncMultiple::*)()) == __alignof(void *), "");
+static_assert(__alignof(void (IncVirtual::*)())  == __alignof(void *), "");
 
 // An incomplete type with an unspecified inheritance model seems to take one
-// more slot than virtual.  It's not clear what it's used for yet.
+// more slot than virtual.
 class IncUnspecified;
 static_assert(sizeof(int IncUnspecified::*) == kUnspecifiedDataSize, "");
 static_assert(sizeof(void (IncUnspecified::*)()) == kUnspecifiedFunctionSize, "");