[hip] Remove `hip_pinned_shadow`.

Summary:
- Use `device_builtin_surface` and `device_builtin_texture` for
  surface/texture reference support. So far, both the host and device
  use the same reference type, which could be revised later when
  interface/implementation is stablized.

Reviewers: yaxunl

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D77583

clang/include/clang/Basic/Attr.td

@@ -322,7 +322,6 @@ class LangOpt<string name, code customCode = [{}]> {
 def MicrosoftExt : LangOpt<"MicrosoftExt">;
 def Borland : LangOpt<"Borland">;
 def CUDA : LangOpt<"CUDA">;
-def HIP : LangOpt<"HIP">;
 def SYCL : LangOpt<"SYCLIsDevice">;
 def COnly : LangOpt<"", "!LangOpts.CPlusPlus">;
 def CPlusPlus : LangOpt<"CPlusPlus">;
@@ -1052,13 +1051,6 @@ def CUDADevice : InheritableAttr {
   let Documentation = [Undocumented];
 }
 
-def HIPPinnedShadow : InheritableAttr {
-  let Spellings = [GNU<"hip_pinned_shadow">, Declspec<"__hip_pinned_shadow__">];
-  let Subjects = SubjectList<[Var]>;
-  let LangOpts = [HIP];
-  let Documentation = [HIPPinnedShadowDocs];
-}
-
 def CUDADeviceBuiltin : IgnoredAttr {
   let Spellings = [GNU<"device_builtin">, Declspec<"__device_builtin__">];
   let LangOpts = [CUDA];

clang/include/clang/Basic/AttrDocs.td

@@ -4613,18 +4613,6 @@ only call one function.
 }];
 }
 
-def HIPPinnedShadowDocs : Documentation {
-  let Category = DocCatType;
-  let Content = [{
-The GNU style attribute __attribute__((hip_pinned_shadow)) or MSVC style attribute
-__declspec(hip_pinned_shadow) can be added to the definition of a global variable
-to indicate it is a HIP pinned shadow variable. A HIP pinned shadow variable can
-be accessed on both device side and host side. It has external linkage and is
-not initialized on device side. It has internal linkage and is initialized by
-the initializer on host side.
-  }];
-}
-
 def CUDADeviceBuiltinSurfaceTypeDocs : Documentation {
   let Category = DocCatType;
   let Content = [{

clang/lib/CodeGen/CodeGenModule.cpp

@@ -1955,9 +1955,9 @@ void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
   }
 }
 
-void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV, bool SkipCheck) {
-  assert(SkipCheck || (!GV->isDeclaration() &&
-                       "Only globals with definition can force usage."));
+void CodeGenModule::addUsedGlobal(llvm::GlobalValue *GV) {
+  assert(!GV->isDeclaration() &&
+         "Only globals with definition can force usage.");
   LLVMUsed.emplace_back(GV);
 }
 
@@ -2520,7 +2520,6 @@ void CodeGenModule::EmitGlobal(GlobalDecl GD) {
           !Global->hasAttr<CUDAGlobalAttr>() &&
           !Global->hasAttr<CUDAConstantAttr>() &&
           !Global->hasAttr<CUDASharedAttr>() &&
-          !(LangOpts.HIP && Global->hasAttr<HIPPinnedShadowAttr>()) &&
           !Global->getType()->isCUDADeviceBuiltinSurfaceType() &&
           !Global->getType()->isCUDADeviceBuiltinTextureType())
         return;
@@ -3928,10 +3927,8 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
        D->getType()->isCUDADeviceBuiltinTextureType());
   // HIP pinned shadow of initialized host-side global variables are also
   // left undefined.
-  bool IsHIPPinnedShadowVar =
-      getLangOpts().CUDAIsDevice && D->hasAttr<HIPPinnedShadowAttr>();
-  if (getLangOpts().CUDA && (IsCUDASharedVar || IsCUDAShadowVar ||
-                             IsCUDADeviceShadowVar || IsHIPPinnedShadowVar))
+  if (getLangOpts().CUDA &&
+      (IsCUDASharedVar || IsCUDAShadowVar || IsCUDADeviceShadowVar))
     Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
   else if (D->hasAttr<LoaderUninitializedAttr>())
     Init = llvm::UndefValue::get(getTypes().ConvertType(ASTTy));
@@ -4039,8 +4036,7 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
       // global variables become internal definitions. These have to
       // be internal in order to prevent name conflicts with global
       // host variables with the same name in a different TUs.
-      if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
-          D->hasAttr<HIPPinnedShadowAttr>()) {
+      if (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>()) {
         Linkage = llvm::GlobalValue::InternalLinkage;
         // Shadow variables and their properties must be registered with CUDA
         // runtime. Skip Extern global variables, which will be registered in
@@ -4087,15 +4083,7 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
     }
   }
 
-  // HIPPinnedShadowVar should remain in the final code object irrespective of
-  // whether it is used or not within the code. Add it to used list, so that
-  // it will not get eliminated when it is unused. Also, it is an extern var
-  // within device code, and it should *not* get initialized within device code.
-  if (IsHIPPinnedShadowVar)
-    addUsedGlobal(GV, /*SkipCheck=*/true);
-  else
-    GV->setInitializer(Init);
-
+  GV->setInitializer(Init);
   if (emitter)
     emitter->finalize(GV);
 

clang/lib/CodeGen/CodeGenModule.h

@@ -1037,7 +1037,7 @@ public:
   void MaybeHandleStaticInExternC(const SomeDecl *D, llvm::GlobalValue *GV);
 
   /// Add a global to a list to be added to the llvm.used metadata.
-  void addUsedGlobal(llvm::GlobalValue *GV, bool SkipCheck = false);
+  void addUsedGlobal(llvm::GlobalValue *GV);
 
   /// Add a global to a list to be added to the llvm.compiler.used metadata.
   void addCompilerUsedGlobal(llvm::GlobalValue *GV);

clang/lib/CodeGen/TargetInfo.cpp

@@ -8407,23 +8407,13 @@ static bool requiresAMDGPUProtectedVisibility(const Decl *D,
          (isa<FunctionDecl>(D) && D->hasAttr<CUDAGlobalAttr>()) ||
          (isa<VarDecl>(D) &&
           (D->hasAttr<CUDADeviceAttr>() || D->hasAttr<CUDAConstantAttr>() ||
-           D->hasAttr<HIPPinnedShadowAttr>()));
-}
-
-static bool requiresAMDGPUDefaultVisibility(const Decl *D,
-                                            llvm::GlobalValue *GV) {
-  if (GV->getVisibility() != llvm::GlobalValue::HiddenVisibility)
-    return false;
-
-  return isa<VarDecl>(D) && D->hasAttr<HIPPinnedShadowAttr>();
+           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinSurfaceType() ||
+           cast<VarDecl>(D)->getType()->isCUDADeviceBuiltinTextureType()));
 }
 
 void AMDGPUTargetCodeGenInfo::setTargetAttributes(
     const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
-  if (requiresAMDGPUDefaultVisibility(D, GV)) {
-    GV->setVisibility(llvm::GlobalValue::DefaultVisibility);
-    GV->setDSOLocal(false);
-  } else if (requiresAMDGPUProtectedVisibility(D, GV)) {
+  if (requiresAMDGPUProtectedVisibility(D, GV)) {
     GV->setVisibility(llvm::GlobalValue::ProtectedVisibility);
     GV->setDSOLocal(true);
   }

clang/lib/Driver/ToolChains/HIP.cpp

@@ -192,8 +192,9 @@ void AMDGCN::Linker::constructLldCommand(Compilation &C, const JobAction &JA,
                                           const char *InputFileName) const {
   // Construct lld command.
   // The output from ld.lld is an HSA code object file.
-  ArgStringList LldArgs{
-      "-flavor", "gnu", "-shared", "-o", Output.getFilename(), InputFileName};
+  ArgStringList LldArgs{"-flavor",    "gnu", "--no-undefined",
+                        "-shared",    "-o",  Output.getFilename(),
+                        InputFileName};
   const char *Lld = Args.MakeArgString(getToolChain().GetProgramPath("lld"));
   C.addCommand(std::make_unique<Command>(JA, *this, Lld, LldArgs, Inputs));
 }

clang/lib/Sema/SemaDeclAttr.cpp

@@ -6930,10 +6930,6 @@ static void ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D,
   case ParsedAttr::AT_CUDAHost:
     handleSimpleAttributeWithExclusions<CUDAHostAttr, CUDAGlobalAttr>(S, D, AL);
     break;
-  case ParsedAttr::AT_HIPPinnedShadow:
-    handleSimpleAttributeWithExclusions<HIPPinnedShadowAttr, CUDADeviceAttr,
-                                        CUDAConstantAttr>(S, D, AL);
-    break;
   case ParsedAttr::AT_CUDADeviceBuiltinSurfaceType:
     handleSimpleAttributeWithExclusions<CUDADeviceBuiltinSurfaceTypeAttr,
                                         CUDADeviceBuiltinTextureTypeAttr>(S, D,

clang/test/AST/ast-dump-hip-pinned-shadow.cu

@@ -1,13 +0,0 @@
-// RUN: %clang_cc1 -fcuda-is-device -ast-dump -ast-dump-filter tex -x hip %s | FileCheck -strict-whitespace %s
-// RUN: %clang_cc1 -ast-dump -ast-dump-filter tex -x hip %s | FileCheck -strict-whitespace %s
-struct textureReference {
-  int a;
-};
-
-// CHECK: HIPPinnedShadowAttr
-template <class T, int texType, int hipTextureReadMode>
-struct texture : public textureReference {
-texture() { a = 1; }
-};
-
-__attribute__((hip_pinned_shadow)) texture<float, 1, 1> tex;

clang/test/Driver/hip-toolchain-no-rdc.hip

@@ -38,7 +38,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV_A_803:".*-gfx803-.*o"]]
 
-// CHECK: [[LLD: ".*lld.*"]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD: ".*lld.*"]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV_A_803:.*out]]" [[OBJ_DEV_A_803]]
 
 //
@@ -67,7 +67,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV_A_900:".*-gfx900-.*o"]]
 
-// CHECK: [[LLD]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV_A_900:.*out]]" [[OBJ_DEV_A_900]]
 
 //
@@ -112,7 +112,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV_B_803:".*-gfx803-.*o"]]
 
-// CHECK: [[LLD]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV_B_803:.*out]]" [[OBJ_DEV_B_803]]
 
 //
@@ -141,7 +141,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV_B_900:".*-gfx900-.*o"]]
 
-// CHECK: [[LLD]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV_B_900:.*out]]" [[OBJ_DEV_B_900]]
 
 //

clang/test/Driver/hip-toolchain-rdc.hip

@@ -44,7 +44,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV1:".*-gfx803-.*o"]]
 
-// CHECK: [[LLD: ".*lld.*"]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD: ".*lld.*"]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV1:.*out]]" [[OBJ_DEV1]]
 
 // CHECK: [[CLANG]] "-cc1" "-triple" "amdgcn-amd-amdhsa"
@@ -77,7 +77,7 @@
 // CHECK-SAME: "-filetype=obj"
 // CHECK-SAME: "-o" [[OBJ_DEV2:".*-gfx900-.*o"]]
 
-// CHECK: [[LLD]] "-flavor" "gnu" "-shared"
+// CHECK: [[LLD]] "-flavor" "gnu" "--no-undefined" "-shared"
 // CHECK-SAME: "-o" "[[IMG_DEV2:.*out]]" [[OBJ_DEV2]]
 
 // CHECK: [[CLANG]] "-cc1" "-triple" "x86_64-unknown-linux-gnu"

clang/test/Misc/pragma-attribute-supported-attributes-list.test

@@ -61,7 +61,6 @@
 // CHECK-NEXT: FlagEnum (SubjectMatchRule_enum)
 // CHECK-NEXT: Flatten (SubjectMatchRule_function)
 // CHECK-NEXT: GNUInline (SubjectMatchRule_function)
-// CHECK-NEXT: HIPPinnedShadow (SubjectMatchRule_variable)
 // CHECK-NEXT: Hot (SubjectMatchRule_function)
 // CHECK-NEXT: IBAction (SubjectMatchRule_objc_method_is_instance)
 // CHECK-NEXT: IFunc (SubjectMatchRule_function)

clang/test/SemaCUDA/hip-pinned-shadow.cu

@@ -1,25 +0,0 @@
-// RUN: %clang_cc1 -triple amdgcn -fcuda-is-device -std=c++11 -fvisibility hidden -fapply-global-visibility-to-externs \
-// RUN:     -emit-llvm -o - -x hip %s -fsyntax-only -verify
-// RUN: %clang_cc1 -triple x86_64 -std=c++11 \
-// RUN:     -emit-llvm -o - -x hip %s -fsyntax-only -verify
-
-#define __device__ __attribute__((device))
-#define __constant__ __attribute__((constant))
-#define __hip_pinned_shadow__ __attribute((hip_pinned_shadow))
-
-struct textureReference {
-  int a;
-};
-
-template <class T, int texType, int hipTextureReadMode>
-struct texture : public textureReference {
-texture() { a = 1; }
-};
-
-__hip_pinned_shadow__ texture<float, 2, 1> tex;
-__device__ __hip_pinned_shadow__ texture<float, 2, 1> tex2; // expected-error{{'hip_pinned_shadow' and 'device' attributes are not compatible}}
-                                                            // expected-error@-1{{dynamic initialization is not supported for __device__, __constant__, and __shared__ variables}}
-                                                            // expected-note@-2{{conflicting attribute is here}}
-__constant__ __hip_pinned_shadow__ texture<float, 2, 1> tex3; // expected-error{{'hip_pinned_shadow' and 'constant' attributes are not compatible}}
-                                                              // expected-error@-1{{dynamic initialization is not supported for __device__, __constant__, and __shared__ variables}}
-                                                              // expected-note@-2{{conflicting attribute is here}}