[SandboxIR] Implement GlobalObject (#108604)

This patch implements sandboxir::GlobalObject mirroring
llvm::GlobalObject.

Author: vporpo

llvm/include/llvm/SandboxIR/SandboxIR.h

@@ -127,6 +127,7 @@ class BlockAddress;
 class DSOLocalEquivalent;
 class ConstantTokenNone;
 class GlobalValue;
+class GlobalObject;
 class Context;
 class Function;
 class Instruction;
@@ -330,6 +331,7 @@ class Value {
   friend class BlockAddress;          // For `Val`.
   friend class GlobalValue;           // For `Val`.
   friend class DSOLocalEquivalent;    // For `Val`.
+  friend class GlobalObject;          // For `Val`.
 
   /// All values point to the context.
   Context &Ctx;
@@ -1124,14 +1126,8 @@ class GlobalValue : public Constant {
   GlobalValue(ClassID ID, llvm::GlobalValue *C, Context &Ctx)
       : Constant(ID, C, Ctx) {}
   friend class Context; // For constructor.
-  Use getOperandUseInternal(unsigned OpIdx, bool Verify) const override {
-    return getOperandUseDefault(OpIdx, Verify);
-  }
 
 public:
-  unsigned getUseOperandNo(const Use &Use) const override {
-    return getUseOperandNoDefault(Use);
-  }
   /// For isa/dyn_cast.
   static bool classof(const sandboxir::Value *From) {
     switch (From->getSubclassID()) {
@@ -1193,6 +1189,102 @@ class GlobalValue : public Constant {
   // TODO: Add missing functions.
 };
 
+class GlobalObject : public GlobalValue {
+protected:
+  GlobalObject(ClassID ID, llvm::GlobalObject *C, Context &Ctx)
+      : GlobalValue(ID, C, Ctx) {}
+  friend class Context; // For constructor.
+  Use getOperandUseInternal(unsigned OpIdx, bool Verify) const final {
+    return getOperandUseDefault(OpIdx, Verify);
+  }
+
+public:
+  unsigned getUseOperandNo(const Use &Use) const final {
+    return getUseOperandNoDefault(Use);
+  }
+  /// For isa/dyn_cast.
+  static bool classof(const sandboxir::Value *From) {
+    switch (From->getSubclassID()) {
+    case ClassID::Function:
+    case ClassID::GlobalVariable:
+    case ClassID::GlobalIFunc:
+      return true;
+    default:
+      return false;
+    }
+  }
+
+  /// FIXME: Remove this function once transition to Align is over.
+  uint64_t getAlignment() const {
+    return cast<llvm::GlobalObject>(Val)->getAlignment();
+  }
+
+  /// Returns the alignment of the given variable or function.
+  ///
+  /// Note that for functions this is the alignment of the code, not the
+  /// alignment of a function pointer.
+  MaybeAlign getAlign() const {
+    return cast<llvm::GlobalObject>(Val)->getAlign();
+  }
+
+  // TODO: Add missing: setAlignment(Align)
+
+  /// Sets the alignment attribute of the GlobalObject.
+  /// This method will be deprecated as the alignment property should always be
+  /// defined.
+  void setAlignment(MaybeAlign Align);
+
+  unsigned getGlobalObjectSubClassData() const {
+    return cast<llvm::GlobalObject>(Val)->getGlobalObjectSubClassData();
+  }
+
+  void setGlobalObjectSubClassData(unsigned V);
+
+  /// Check if this global has a custom object file section.
+  ///
+  /// This is more efficient than calling getSection() and checking for an empty
+  /// string.
+  bool hasSection() const {
+    return cast<llvm::GlobalObject>(Val)->hasSection();
+  }
+
+  /// Get the custom section of this global if it has one.
+  ///
+  /// If this global does not have a custom section, this will be empty and the
+  /// default object file section (.text, .data, etc) will be used.
+  StringRef getSection() const {
+    return cast<llvm::GlobalObject>(Val)->getSection();
+  }
+
+  /// Change the section for this global.
+  ///
+  /// Setting the section to the empty string tells LLVM to choose an
+  /// appropriate default object file section.
+  void setSection(StringRef S);
+
+  bool hasComdat() const { return cast<llvm::GlobalObject>(Val)->hasComdat(); }
+
+  // TODO: implement get/setComdat(), etc. once we have a sandboxir::Comdat.
+
+  // TODO: We currently don't support Metadata in sandboxir so all
+  // Metadata-related functions are missing.
+
+  using VCallVisibility = llvm::GlobalObject::VCallVisibility;
+
+  VCallVisibility getVCallVisibility() const {
+    return cast<llvm::GlobalObject>(Val)->getVCallVisibility();
+  }
+
+  /// Returns true if the alignment of the value can be unilaterally
+  /// increased.
+  ///
+  /// Note that for functions this is the alignment of the code, not the
+  /// alignment of a function pointer.
+  bool canIncreaseAlignment() const {
+    return cast<llvm::GlobalObject>(Val)->canIncreaseAlignment();
+  }
+};
+
 class BlockAddress final : public Constant {
   BlockAddress(llvm::BlockAddress *C, Context &Ctx)
       : Constant(ClassID::BlockAddress, C, Ctx) {}
@@ -4127,7 +4219,7 @@ class Context {
   size_t getNumValues() const { return LLVMValueToValueMap.size(); }
 };
 
-class Function : public Constant {
+class Function : public GlobalObject {
   /// Helper for mapped_iterator.
   struct LLVMBBToBB {
     Context &Ctx;
@@ -4138,7 +4230,7 @@ class Function : public Constant {
   };
   /// Use Context::createFunction() instead.
   Function(llvm::Function *F, sandboxir::Context &Ctx)
-      : Constant(ClassID::Function, F, Ctx) {}
+      : GlobalObject(ClassID::Function, F, Ctx) {}
   friend class Context; // For constructor.
 
 public:

llvm/lib/SandboxIR/SandboxIR.cpp

@@ -2495,6 +2495,30 @@ PoisonValue *PoisonValue::getElementValue(unsigned Idx) const {
       cast<llvm::PoisonValue>(Val)->getElementValue(Idx)));
 }
 
+void GlobalObject::setAlignment(MaybeAlign Align) {
+  Ctx.getTracker()
+      .emplaceIfTracking<
+          GenericSetter<&GlobalObject::getAlign, &GlobalObject::setAlignment>>(
+          this);
+  cast<llvm::GlobalObject>(Val)->setAlignment(Align);
+}
+
+void GlobalObject::setGlobalObjectSubClassData(unsigned V) {
+  Ctx.getTracker()
+      .emplaceIfTracking<
+          GenericSetter<&GlobalObject::getGlobalObjectSubClassData,
+                        &GlobalObject::setGlobalObjectSubClassData>>(this);
+  cast<llvm::GlobalObject>(Val)->setGlobalObjectSubClassData(V);
+}
+
+void GlobalObject::setSection(StringRef S) {
+  Ctx.getTracker()
+      .emplaceIfTracking<
+          GenericSetter<&GlobalObject::getSection, &GlobalObject::setSection>>(
+          this);
+  cast<llvm::GlobalObject>(Val)->setSection(S);
+}
+
 void GlobalValue::setUnnamedAddr(UnnamedAddr V) {
   Ctx.getTracker()
       .emplaceIfTracking<GenericSetter<&GlobalValue::getUnnamedAddr,

llvm/unittests/SandboxIR/SandboxIRTest.cpp

@@ -795,6 +795,70 @@ define void @foo() {
   EXPECT_EQ(GV->getVisibility(), OrigVisibility);
 }
 
+TEST_F(SandboxIRTest, GlobalObject) {
+  parseIR(C, R"IR(
+declare external void @bar()
+define void @foo() {
+  call void @bar()
+  ret void
+}
+)IR");
+  Function &LLVMF = *M->getFunction("foo");
+  auto *LLVMBB = &*LLVMF.begin();
+  auto LLVMIt = LLVMBB->begin();
+  auto *LLVMCall = cast<llvm::CallInst>(&*LLVMIt++);
+  auto *LLVMGO = cast<llvm::GlobalObject>(LLVMCall->getCalledOperand());
+  sandboxir::Context Ctx(C);
+
+  auto &F = *Ctx.createFunction(&LLVMF);
+  auto *BB = &*F.begin();
+  auto It = BB->begin();
+  auto *Call = cast<sandboxir::CallInst>(&*It++);
+  // Check classof(), creation.
+  auto *GO = cast<sandboxir::GlobalObject>(Call->getCalledOperand());
+  // Check getAlignment().
+  EXPECT_EQ(GO->getAlignment(), LLVMGO->getAlignment());
+  // Check getAlign().
+  EXPECT_EQ(GO->getAlign(), LLVMGO->getAlign());
+  // Check setAlignment().
+  auto OrigMaybeAlign = GO->getAlign();
+  auto NewMaybeAlign = MaybeAlign(128);
+  EXPECT_NE(NewMaybeAlign, OrigMaybeAlign);
+  GO->setAlignment(NewMaybeAlign);
+  EXPECT_EQ(GO->getAlign(), NewMaybeAlign);
+  GO->setAlignment(OrigMaybeAlign);
+  EXPECT_EQ(GO->getAlign(), OrigMaybeAlign);
+  // Check getGlobalObjectSubClassData().
+  EXPECT_EQ(GO->getGlobalObjectSubClassData(),
+            LLVMGO->getGlobalObjectSubClassData());
+  // Check setGlobalObjectSubClassData().
+  auto OrigGOSCD = GO->getGlobalObjectSubClassData();
+  auto NewGOSCD = 1u;
+  EXPECT_NE(NewGOSCD, OrigGOSCD);
+  GO->setGlobalObjectSubClassData(NewGOSCD);
+  EXPECT_EQ(GO->getGlobalObjectSubClassData(), NewGOSCD);
+  GO->setGlobalObjectSubClassData(OrigGOSCD);
+  EXPECT_EQ(GO->getGlobalObjectSubClassData(), OrigGOSCD);
+  // Check hasSection().
+  EXPECT_EQ(GO->hasSection(), LLVMGO->hasSection());
+  // Check getSection().
+  EXPECT_EQ(GO->getSection(), LLVMGO->getSection());
+  // Check setSection().
+  auto OrigSection = GO->getSection();
+  auto NewSection = ".some_section";
+  EXPECT_NE(NewSection, OrigSection);
+  GO->setSection(NewSection);
+  EXPECT_EQ(GO->getSection(), NewSection);
+  GO->setSection(OrigSection);
+  EXPECT_EQ(GO->getSection(), OrigSection);
+  // Check hasComdat().
+  EXPECT_EQ(GO->hasComdat(), LLVMGO->hasComdat());
+  // Check getVCallVisibility().
+  EXPECT_EQ(GO->getVCallVisibility(), LLVMGO->getVCallVisibility());
+  // Check canIncreaseAlignment().
+  EXPECT_EQ(GO->canIncreaseAlignment(), LLVMGO->canIncreaseAlignment());
+}
+
 TEST_F(SandboxIRTest, BlockAddress) {
   parseIR(C, R"IR(
 define void @foo(ptr %ptr) {