Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/clang/unittests/CodeGen/BufferSourceTest.cpp

@@ -0,0 +1,80 @@
+//===- unittests/CodeGen/BufferSourceTest.cpp - MemoryBuffer source tests -===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Sema/Sema.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace clang;
+
+namespace {
+
+// Emitting constructors for global objects involves looking
+// at the source file name. This makes sure that we don't crash
+// if the source file is a memory buffer.
+const char TestProgram[] =
+    "class EmitCXXGlobalInitFunc    "
+    "{                              "
+    "public:                        "
+    "   EmitCXXGlobalInitFunc() {}  "
+    "};                             "
+    "EmitCXXGlobalInitFunc test;    ";
+
+TEST(BufferSourceTest, EmitCXXGlobalInitFunc) {
+    LLVMContext Context;
+    CompilerInstance compiler;
+
+    compiler.createDiagnostics();
+    compiler.getLangOpts().CPlusPlus = 1;
+    compiler.getLangOpts().CPlusPlus11 = 1;
+
+    compiler.getTargetOpts().Triple = llvm::Triple::normalize(
+        llvm::sys::getProcessTriple());
+    compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+      compiler.getDiagnostics(),
+      std::make_shared<clang::TargetOptions>(
+        compiler.getTargetOpts())));
+
+    compiler.createFileManager();
+    compiler.createSourceManager(compiler.getFileManager());
+    compiler.createPreprocessor(clang::TU_Prefix);
+
+    compiler.createASTContext();
+
+    compiler.setASTConsumer(std::unique_ptr<ASTConsumer>(
+        CreateLLVMCodeGen(
+            compiler.getDiagnostics(),
+            "EmitCXXGlobalInitFuncTest",
+            compiler.getHeaderSearchOpts(),
+            compiler.getPreprocessorOpts(),
+            compiler.getCodeGenOpts(),
+            Context)));
+
+    compiler.createSema(clang::TU_Prefix, nullptr);
+
+    clang::SourceManager &sm = compiler.getSourceManager();
+    sm.setMainFileID(sm.createFileID(
+        llvm::MemoryBuffer::getMemBuffer(TestProgram), clang::SrcMgr::C_User));
+
+    clang::ParseAST(compiler.getSema(), false, false);
+}
+
+} // end anonymous namespace

external/llvm-project/clang/unittests/CodeGen/CMakeLists.txt

@@ -0,0 +1,21 @@
+set(LLVM_LINK_COMPONENTS
+  Core
+  Support
+  )
+
+add_clang_unittest(ClangCodeGenTests
+  BufferSourceTest.cpp
+  CodeGenExternalTest.cpp
+  IncrementalProcessingTest.cpp
+  TBAAMetadataTest.cpp
+  )
+
+target_link_libraries(ClangCodeGenTests
+  PRIVATE
+  clangAST
+  clangBasic
+  clangCodeGen
+  clangFrontend
+  clangLex
+  clangParse
+  )

external/llvm-project/clang/unittests/CodeGen/CodeGenExternalTest.cpp

@@ -0,0 +1,302 @@
+//===- unittests/CodeGen/CodeGenExternalTest.cpp - test external CodeGen -===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/GlobalDecl.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CodeGen/CodeGenABITypes.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Sema/Sema.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace clang;
+
+namespace {
+
+// Mocks up a language using Clang code generation as a library and
+// tests some basic functionality there.
+//   - CodeGen->GetAddrOfGlobal
+//   - CodeGen::convertTypeForMemory
+//   - CodeGen::getLLVMFieldNumber
+
+static const bool DebugThisTest = false;
+
+// forward declarations
+struct MyASTConsumer;
+static void test_codegen_fns(MyASTConsumer *my);
+static bool test_codegen_fns_ran;
+
+// This forwards the calls to the Clang CodeGenerator
+// so that we can test CodeGen functions while it is open.
+// It accumulates toplevel decls in HandleTopLevelDecl and
+// calls test_codegen_fns() in HandleTranslationUnit
+// before forwarding that function to the CodeGenerator.
+
+struct MyASTConsumer : public ASTConsumer {
+  std::unique_ptr<CodeGenerator> Builder;
+  std::vector<Decl*> toplevel_decls;
+
+  MyASTConsumer(std::unique_ptr<CodeGenerator> Builder_in)
+    : ASTConsumer(), Builder(std::move(Builder_in))
+  {
+  }
+
+  ~MyASTConsumer() { }
+
+  void Initialize(ASTContext &Context) override;
+  void HandleCXXStaticMemberVarInstantiation(VarDecl *VD) override;
+  bool HandleTopLevelDecl(DeclGroupRef D) override;
+  void HandleInlineFunctionDefinition(FunctionDecl *D) override;
+  void HandleInterestingDecl(DeclGroupRef D) override;
+  void HandleTranslationUnit(ASTContext &Ctx) override;
+  void HandleTagDeclDefinition(TagDecl *D) override;
+  void HandleTagDeclRequiredDefinition(const TagDecl *D) override;
+  void HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) override;
+  void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override;
+  void HandleImplicitImportDecl(ImportDecl *D) override;
+  void CompleteTentativeDefinition(VarDecl *D) override;
+  void AssignInheritanceModel(CXXRecordDecl *RD) override;
+  void HandleVTable(CXXRecordDecl *RD) override;
+  ASTMutationListener *GetASTMutationListener() override;
+  ASTDeserializationListener *GetASTDeserializationListener() override;
+  void PrintStats() override;
+  bool shouldSkipFunctionBody(Decl *D) override;
+};
+
+void MyASTConsumer::Initialize(ASTContext &Context) {
+  Builder->Initialize(Context);
+}
+
+bool MyASTConsumer::HandleTopLevelDecl(DeclGroupRef DG) {
+
+  for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) {
+    toplevel_decls.push_back(*I);
+  }
+
+  return Builder->HandleTopLevelDecl(DG);
+}
+
+void MyASTConsumer::HandleInlineFunctionDefinition(FunctionDecl *D) {
+  Builder->HandleInlineFunctionDefinition(D);
+}
+
+void MyASTConsumer::HandleInterestingDecl(DeclGroupRef D) {
+  Builder->HandleInterestingDecl(D);
+}
+
+void MyASTConsumer::HandleTranslationUnit(ASTContext &Context) {
+  test_codegen_fns(this);
+  // HandleTranslationUnit can close the module
+  Builder->HandleTranslationUnit(Context);
+}
+
+void MyASTConsumer::HandleTagDeclDefinition(TagDecl *D) {
+  Builder->HandleTagDeclDefinition(D);
+}
+
+void MyASTConsumer::HandleTagDeclRequiredDefinition(const TagDecl *D) {
+  Builder->HandleTagDeclRequiredDefinition(D);
+}
+
+void MyASTConsumer::HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) {
+  Builder->HandleCXXImplicitFunctionInstantiation(D);
+}
+
+void MyASTConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {
+  Builder->HandleTopLevelDeclInObjCContainer(D);
+}
+
+void MyASTConsumer::HandleImplicitImportDecl(ImportDecl *D) {
+  Builder->HandleImplicitImportDecl(D);
+}
+
+void MyASTConsumer::CompleteTentativeDefinition(VarDecl *D) {
+  Builder->CompleteTentativeDefinition(D);
+}
+
+void MyASTConsumer::AssignInheritanceModel(CXXRecordDecl *RD) {
+  Builder->AssignInheritanceModel(RD);
+}
+
+void MyASTConsumer::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
+   Builder->HandleCXXStaticMemberVarInstantiation(VD);
+}
+
+void MyASTConsumer::HandleVTable(CXXRecordDecl *RD) {
+   Builder->HandleVTable(RD);
+ }
+
+ASTMutationListener *MyASTConsumer::GetASTMutationListener() {
+  return Builder->GetASTMutationListener();
+}
+
+ASTDeserializationListener *MyASTConsumer::GetASTDeserializationListener() {
+  return Builder->GetASTDeserializationListener();
+}
+
+void MyASTConsumer::PrintStats() {
+  Builder->PrintStats();
+}
+
+bool MyASTConsumer::shouldSkipFunctionBody(Decl *D) {
+  return Builder->shouldSkipFunctionBody(D);
+}
+
+const char TestProgram[] =
+    "struct mytest_struct { char x; short y; char p; long z; };\n"
+    "int mytest_fn(int x) { return x; }\n";
+
+// This function has the real test code here
+static void test_codegen_fns(MyASTConsumer *my) {
+
+  bool mytest_fn_ok = false;
+  bool mytest_struct_ok = false;
+
+  CodeGen::CodeGenModule &CGM = my->Builder->CGM();
+
+  for (auto decl : my->toplevel_decls ) {
+    if (FunctionDecl *fd = dyn_cast<FunctionDecl>(decl)) {
+      if (fd->getName() == "mytest_fn") {
+        Constant *c = my->Builder->GetAddrOfGlobal(GlobalDecl(fd), false);
+        // Verify that we got a function.
+        ASSERT_TRUE(c != NULL);
+        if (DebugThisTest) {
+          c->print(dbgs(), true);
+          dbgs() << "\n";
+        }
+        mytest_fn_ok = true;
+      }
+    } else if(clang::RecordDecl *rd = dyn_cast<RecordDecl>(decl)) {
+      if (rd->getName() == "mytest_struct") {
+        RecordDecl *def = rd->getDefinition();
+        ASSERT_TRUE(def != NULL);
+        const clang::Type *clangTy = rd->getCanonicalDecl()->getTypeForDecl();
+        ASSERT_TRUE(clangTy != NULL);
+        QualType qType = clangTy->getCanonicalTypeInternal();
+
+        // Check convertTypeForMemory
+        llvm::Type *llvmTy = CodeGen::convertTypeForMemory(CGM, qType);
+        ASSERT_TRUE(llvmTy != NULL);
+        if (DebugThisTest) {
+          llvmTy->print(dbgs(), true);
+          dbgs() << "\n";
+        }
+
+        llvm::CompositeType* structTy = dyn_cast<CompositeType>(llvmTy);
+        ASSERT_TRUE(structTy != NULL);
+
+        // Check getLLVMFieldNumber
+        FieldDecl *xField = NULL;
+        FieldDecl *yField = NULL;
+        FieldDecl *zField = NULL;
+
+        for (auto field : rd->fields()) {
+          if (field->getName() == "x") xField = field;
+          if (field->getName() == "y") yField = field;
+          if (field->getName() == "z") zField = field;
+        }
+
+        ASSERT_TRUE(xField != NULL);
+        ASSERT_TRUE(yField != NULL);
+        ASSERT_TRUE(zField != NULL);
+
+        unsigned x = CodeGen::getLLVMFieldNumber(CGM, rd, xField);
+        unsigned y = CodeGen::getLLVMFieldNumber(CGM, rd, yField);
+        unsigned z = CodeGen::getLLVMFieldNumber(CGM, rd, zField);
+
+        ASSERT_NE(x, y);
+        ASSERT_NE(y, z);
+
+        llvm::Type* xTy = structTy->getTypeAtIndex(x);
+        llvm::Type* yTy = structTy->getTypeAtIndex(y);
+        llvm::Type* zTy = structTy->getTypeAtIndex(z);
+
+        ASSERT_TRUE(xTy != NULL);
+        ASSERT_TRUE(yTy != NULL);
+        ASSERT_TRUE(zTy != NULL);
+
+        if (DebugThisTest) {
+          xTy->print(dbgs(), true);
+          dbgs() << "\n";
+          yTy->print(dbgs(), true);
+          dbgs() << "\n";
+          zTy->print(dbgs(), true);
+          dbgs() << "\n";
+        }
+
+        ASSERT_GE(xTy->getPrimitiveSizeInBits(), 1u);
+        ASSERT_GE(yTy->getPrimitiveSizeInBits(), 16u); // short is at least 16b
+        ASSERT_GE(zTy->getPrimitiveSizeInBits(), 32u); // long is at least 32b
+
+        mytest_struct_ok = true;
+      }
+    }
+  }
+
+  ASSERT_TRUE(mytest_fn_ok);
+  ASSERT_TRUE(mytest_struct_ok);
+
+  test_codegen_fns_ran = true;
+}
+
+TEST(CodeGenExternalTest, CodeGenExternalTest) {
+    LLVMContext Context;
+    CompilerInstance compiler;
+
+    compiler.createDiagnostics();
+    compiler.getLangOpts().CPlusPlus = 1;
+    compiler.getLangOpts().CPlusPlus11 = 1;
+
+    compiler.getTargetOpts().Triple = llvm::Triple::normalize(
+        llvm::sys::getProcessTriple());
+    compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+      compiler.getDiagnostics(),
+      std::make_shared<clang::TargetOptions>(
+        compiler.getTargetOpts())));
+
+    compiler.createFileManager();
+    compiler.createSourceManager(compiler.getFileManager());
+    compiler.createPreprocessor(clang::TU_Prefix);
+
+    compiler.createASTContext();
+
+
+    compiler.setASTConsumer(std::unique_ptr<ASTConsumer>(
+          new MyASTConsumer(std::unique_ptr<CodeGenerator>(
+             CreateLLVMCodeGen(compiler.getDiagnostics(),
+                               "MemoryTypesTest",
+                               compiler.getHeaderSearchOpts(),
+                               compiler.getPreprocessorOpts(),
+                               compiler.getCodeGenOpts(),
+                               Context)))));
+
+    compiler.createSema(clang::TU_Prefix, nullptr);
+
+    clang::SourceManager &sm = compiler.getSourceManager();
+    sm.setMainFileID(sm.createFileID(
+        llvm::MemoryBuffer::getMemBuffer(TestProgram), clang::SrcMgr::C_User));
+
+    clang::ParseAST(compiler.getSema(), false, false);
+
+    ASSERT_TRUE(test_codegen_fns_ran);
+}
+
+} // end anonymous namespace

external/llvm-project/clang/unittests/CodeGen/IRMatchers.h

@@ -0,0 +1,453 @@
+//=== unittests/CodeGen/IRMatchers.h - Match on the LLVM IR -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file provides a simple mechanism for performing search operations over
+/// IR including metadata and types. It allows writing complex search patterns
+/// using understandable syntax. For instance, the code:
+///
+/// \code
+///       const BasicBlock *BB = ...
+///       const Instruction *I = match(BB,
+///           MInstruction(Instruction::Store,
+///               MConstInt(4, 8),
+///               MMTuple(
+///                   MMTuple(
+///                       MMString("omnipotent char"),
+///                       MMTuple(
+///                           MMString("Simple C/C++ TBAA")),
+///                       MConstInt(0, 64)),
+///                   MSameAs(0),
+///                   MConstInt(0))));
+/// \endcode
+///
+/// searches the basic block BB for the 'store' instruction, first argument of
+/// which is 'i8 4', and the attached metadata has an item described by the
+/// given tree.
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_UNITTESTS_CODEGEN_IRMATCHERS_H
+#define CLANG_UNITTESTS_CODEGEN_IRMATCHERS_H
+
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Value.h"
+
+namespace llvm {
+
+/// Keeps information about pending match queries.
+///
+/// This class stores state of all unfinished match actions. It allows to
+/// use queries like "this operand is the same as n-th operand", which are
+/// hard to implement otherwise.
+///
+class MatcherContext {
+public:
+
+  /// Describes pending match query.
+  ///
+  /// The query is represented by the current entity being investigated (type,
+  /// value or metadata). If the entity is a member of a list (like arguments),
+  /// the query also keeps the entity number in that list.
+  ///
+  class Query {
+    PointerUnion3<const Value *, const Metadata *, const Type *> Entity;
+    unsigned OperandNo;
+
+  public:
+    Query(const Value *V, unsigned N) : Entity(V), OperandNo(N) {}
+    Query(const Metadata *M, unsigned N) : Entity(M), OperandNo(N) {}
+    Query(const Type *T, unsigned N) : Entity(T), OperandNo(N) {}
+
+    template<typename T>
+    const T *get() const {
+      return Entity.dyn_cast<const T *>();
+    }
+
+    unsigned getOperandNo() const { return OperandNo; }
+  };
+
+  template<typename T>
+  void push(const T *V, unsigned N = ~0) {
+    MatchStack.push_back(Query(V, N));
+  }
+
+  void pop() { MatchStack.pop_back(); }
+
+  template<typename T>
+  const T *top() const { return MatchStack.back().get<T>(); }
+
+  size_t size() const { return MatchStack.size(); }
+
+  unsigned getOperandNo() const { return MatchStack.back().getOperandNo(); }
+
+  /// Returns match query at the given offset from the top of queries.
+  ///
+  /// Offset 0 corresponds to the topmost query.
+  ///
+  const Query &getQuery(unsigned Offset) const {
+    assert(MatchStack.size() > Offset);
+    return MatchStack[MatchStack.size() - 1 - Offset];
+  }
+
+private:
+  SmallVector<Query, 8> MatchStack;
+};
+
+
+/// Base of all matcher classes.
+///
+class Matcher {
+public:
+  virtual ~Matcher() {}
+
+  /// Returns true if the entity on the top of the specified context satisfies
+  /// the matcher condition.
+  ///
+  virtual bool match(MatcherContext &MC) = 0;
+};
+
+
+/// Base class of matchers that test particular entity.
+///
+template<typename T>
+class EntityMatcher : public Matcher {
+public:
+  bool match(MatcherContext &MC) override {
+    if (auto V = MC.top<T>())
+      return matchEntity(*V, MC);
+    return false;
+  }
+  virtual bool matchEntity(const T &M, MatcherContext &C) = 0;
+};
+
+
+/// Matcher that matches any entity of the specified kind.
+///
+template<typename T>
+class AnyMatcher : public EntityMatcher<T> {
+public:
+  bool matchEntity(const T &M, MatcherContext &C) override { return true; }
+};
+
+
+/// Matcher that tests if the current entity satisfies the specified
+/// condition.
+///
+template<typename T>
+class CondMatcher : public EntityMatcher<T> {
+  std::function<bool(const T &)> Condition;
+public:
+  CondMatcher(std::function<bool(const T &)> C) : Condition(C) {}
+  bool matchEntity(const T &V, MatcherContext &C) override {
+    return Condition(V);
+  }
+};
+
+
+/// Matcher that save pointer to the entity that satisfies condition of the
+// specified matcher.
+///
+template<typename T>
+class SavingMatcher : public EntityMatcher<T> {
+  const T *&Var;
+  std::shared_ptr<Matcher> Next;
+public:
+  SavingMatcher(const T *&V, std::shared_ptr<Matcher> N) : Var(V), Next(N) {}
+  bool matchEntity(const T &V, MatcherContext &C) override {
+    bool Result = Next->match(C);
+    if (Result)
+      Var = &V;
+    return Result;
+  }
+};
+
+
+/// Matcher that checks that the entity is identical to another entity in the
+/// same container.
+///
+class SameAsMatcher : public Matcher {
+  unsigned OpNo;
+public:
+  SameAsMatcher(unsigned N) : OpNo(N) {}
+  bool match(MatcherContext &C) override {
+    if (C.getOperandNo() != ~0U) {
+      // Handle all known containers here.
+      const MatcherContext::Query &StackRec = C.getQuery(1);
+      if (const Metadata *MR = StackRec.get<Metadata>()) {
+        if (const auto *MT = dyn_cast<MDTuple>(MR)) {
+          if (OpNo < MT->getNumOperands())
+            return C.top<Metadata>() == MT->getOperand(OpNo).get();
+          return false;
+        }
+        llvm_unreachable("Unknown metadata container");
+      }
+      if (const Value *VR = StackRec.get<Value>()) {
+        if (const auto *Insn = dyn_cast<Instruction>(VR)) {
+          if (OpNo < Insn->getNumOperands())
+            return C.top<Value>() == Insn->getOperand(OpNo);
+          return false;
+        }
+        llvm_unreachable("Unknown value container");
+      }
+      llvm_unreachable("Unknown type container");
+    }
+    return false;
+  }
+};
+
+
+/// Matcher that tests if the entity is a constant integer.
+///
+class ConstantIntMatcher : public Matcher {
+  uint64_t IntValue;
+  unsigned Width;
+public:
+  ConstantIntMatcher(uint64_t V, unsigned W = 0) : IntValue(V), Width(W) {}
+  bool match(MatcherContext &Ctx) override {
+    if (const Value *V = Ctx.top<Value>()) {
+      if (const auto *CI = dyn_cast<ConstantInt>(V))
+        return (Width == 0 || CI->getBitWidth() == Width) &&
+               CI->getLimitedValue() == IntValue;
+    }
+    if (const Metadata *M = Ctx.top<Metadata>()) {
+      if (const auto *MT = dyn_cast<ValueAsMetadata>(M))
+        if (const auto *C = dyn_cast<ConstantInt>(MT->getValue()))
+          return (Width == 0 || C->getBitWidth() == Width) &&
+                 C->getLimitedValue() == IntValue;
+    }
+    return false;
+  }
+};
+
+
+/// Value matcher tuned to test instructions.
+///
+class InstructionMatcher : public EntityMatcher<Value> {
+  SmallVector<std::shared_ptr<Matcher>, 8> OperandMatchers;
+  std::shared_ptr<EntityMatcher<Metadata>> MetaMatcher = nullptr;
+  unsigned Code;
+public:
+  InstructionMatcher(unsigned C) : Code(C) {}
+
+  void push(std::shared_ptr<EntityMatcher<Metadata>> M) {
+    assert(!MetaMatcher && "Only one metadata matcher may be specified");
+    MetaMatcher = M;
+  }
+  void push(std::shared_ptr<Matcher> V) { OperandMatchers.push_back(V); }
+  template<typename... Args>
+  void push(std::shared_ptr<Matcher> V, Args... A) {
+    push(V);
+    push(A...);
+  }
+
+  virtual bool matchInstruction(const Instruction &I) {
+    return I.getOpcode() == Code;
+  }
+
+  bool matchEntity(const Value &V, MatcherContext &C) override {
+    if (const auto *I = dyn_cast<Instruction>(&V)) {
+      if (!matchInstruction(*I))
+        return false;
+      if (OperandMatchers.size() > I->getNumOperands())
+        return false;
+      for (unsigned N = 0, E = OperandMatchers.size(); N != E; ++N) {
+        C.push(I->getOperand(N), N);
+        if (!OperandMatchers[N]->match(C)) {
+          C.pop();
+          return false;
+        }
+        C.pop();
+      }
+      if (MetaMatcher) {
+        SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;
+        I->getAllMetadata(MDs);
+        bool Found = false;
+        for (auto Item : MDs) {
+          C.push(Item.second);
+          if (MetaMatcher->match(C)) {
+            Found = true;
+            C.pop();
+            break;
+          }
+          C.pop();
+        }
+        return Found;
+      }
+      return true;
+    }
+    return false;
+  }
+};
+
+
+/// Matcher that tests type of the current value using the specified
+/// type matcher.
+///
+class ValueTypeMatcher : public EntityMatcher<Value> {
+  std::shared_ptr<EntityMatcher<Type>> TyM;
+public:
+  ValueTypeMatcher(std::shared_ptr<EntityMatcher<Type>> T) : TyM(T) {}
+  ValueTypeMatcher(const Type *T)
+    : TyM(new CondMatcher<Type>([T](const Type &Ty) -> bool {
+                                  return &Ty == T;
+                                })) {}
+  bool matchEntity(const Value &V, MatcherContext &Ctx) override {
+    Type *Ty = V.getType();
+    Ctx.push(Ty);
+    bool Res = TyM->match(Ctx);
+    Ctx.pop();
+    return Res;
+  }
+};
+
+
+/// Matcher that matches string metadata.
+///
+class NameMetaMatcher : public EntityMatcher<Metadata> {
+  StringRef Name;
+public:
+  NameMetaMatcher(StringRef N) : Name(N) {}
+  bool matchEntity(const Metadata &M, MatcherContext &C) override {
+    if (auto *MDS = dyn_cast<MDString>(&M))
+      return MDS->getString().equals(Name);
+    return false;
+  }
+};
+
+
+/// Matcher that matches metadata tuples.
+///
+class MTupleMatcher : public EntityMatcher<Metadata> {
+  SmallVector<std::shared_ptr<Matcher>, 4> Operands;
+public:
+  void push(std::shared_ptr<Matcher> M) { Operands.push_back(M); }
+  template<typename... Args>
+  void push(std::shared_ptr<Matcher> M, Args... A) {
+    push(M);
+    push(A...);
+  }
+  bool matchEntity(const Metadata &M, MatcherContext &C) override {
+    if (const auto *MT = dyn_cast<MDTuple>(&M)) {
+      if (MT->getNumOperands() != Operands.size())
+        return false;
+      for (unsigned I = 0, E = MT->getNumOperands(); I != E; ++I) {
+        const MDOperand &Op = MT->getOperand(I);
+        C.push(Op.get(), I);
+        if (!Operands[I]->match(C)) {
+          C.pop();
+          return false;
+        }
+        C.pop();
+      }
+      return true;
+    }
+    return false;
+  }
+};
+
+
+// Helper function used to construct matchers.
+
+std::shared_ptr<Matcher> MSameAs(unsigned N) {
+  return std::shared_ptr<Matcher>(new SameAsMatcher(N));
+}
+
+template<typename... T>
+std::shared_ptr<InstructionMatcher> MInstruction(unsigned C, T... Args) {
+  auto Result = new InstructionMatcher(C);
+  Result->push(Args...);
+  return std::shared_ptr<InstructionMatcher>(Result);
+}
+
+std::shared_ptr<Matcher> MConstInt(uint64_t V, unsigned W = 0) {
+  return std::shared_ptr<Matcher>(new ConstantIntMatcher(V, W));
+}
+
+std::shared_ptr<EntityMatcher<Value>>
+ MValType(std::shared_ptr<EntityMatcher<Type>> T) {
+  return std::shared_ptr<EntityMatcher<Value>>(new ValueTypeMatcher(T));
+}
+
+std::shared_ptr<EntityMatcher<Value>> MValType(const Type *T) {
+  return std::shared_ptr<EntityMatcher<Value>>(new ValueTypeMatcher(T));
+}
+
+std::shared_ptr<EntityMatcher<Type>>
+MType(std::function<bool(const Type &)> C) {
+  return std::shared_ptr<EntityMatcher<Type>>(new CondMatcher<Type>(C));
+}
+
+std::shared_ptr<EntityMatcher<Metadata>> MMAny() {
+  return std::shared_ptr<EntityMatcher<Metadata>>(new AnyMatcher<Metadata>);
+}
+
+std::shared_ptr<EntityMatcher<Metadata>>
+MMSave(const Metadata *&V, std::shared_ptr<EntityMatcher<Metadata>> M) {
+  return std::shared_ptr<EntityMatcher<Metadata>>(
+      new SavingMatcher<Metadata>(V, M));
+}
+
+std::shared_ptr<EntityMatcher<Metadata>>
+MMString(const char *Name) {
+  return std::shared_ptr<EntityMatcher<Metadata>>(new NameMetaMatcher(Name));
+}
+
+template<typename... T>
+std::shared_ptr<EntityMatcher<Metadata>> MMTuple(T... Args) {
+  auto Res = new MTupleMatcher();
+  Res->push(Args...);
+  return std::shared_ptr<EntityMatcher<Metadata>>(Res);
+}
+
+
+/// Looks for the instruction that satisfies condition of the specified
+/// matcher inside the given basic block.
+/// \returns Pointer to the found instruction or nullptr if such instruction
+///          was not found.
+///
+const Instruction *match(const BasicBlock *BB, std::shared_ptr<Matcher> M) {
+  MatcherContext MC;
+  for (const auto &I : *BB) {
+    MC.push(&I);
+    if (M->match(MC))
+      return &I;
+    MC.pop();
+  }
+  assert(MC.size() == 0);
+  return nullptr;
+}
+
+
+/// Looks for the instruction that satisfies condition of the specified
+/// matcher starting from the specified instruction inside the same basic block.
+///
+/// The given instruction is not checked.
+///
+const Instruction *matchNext(const Instruction *I, std::shared_ptr<Matcher> M) {
+  if (!I)
+    return nullptr;
+  MatcherContext MC;
+  const BasicBlock *BB = I->getParent();
+  if (!BB)
+    return nullptr;
+  for (auto P = ++BasicBlock::const_iterator(I), E = BB->end(); P != E; ++P) {
+    MC.push(&*P);
+    if (M->match(MC))
+      return &*P;
+    MC.pop();
+  }
+  assert(MC.size() == 0);
+  return nullptr;
+}
+
+}
+#endif

external/llvm-project/clang/unittests/CodeGen/IncrementalProcessingTest.cpp

@@ -0,0 +1,174 @@
+//=== unittests/CodeGen/IncrementalProcessingTest.cpp - IncrementalCodeGen ===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/Parser.h"
+#include "clang/Sema/Sema.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+#include <memory>
+
+using namespace llvm;
+using namespace clang;
+
+namespace {
+
+// Incremental processing produces several modules, all using the same "main
+// file". Make sure CodeGen can cope with that, e.g. for static initializers.
+const char TestProgram1[] =
+    "extern \"C\" int funcForProg1() { return 17; }\n"
+    "struct EmitCXXGlobalInitFunc1 {\n"
+    "   EmitCXXGlobalInitFunc1() {}\n"
+    "} test1;";
+
+const char TestProgram2[] =
+    "extern \"C\" int funcForProg2() { return 42; }\n"
+    "struct EmitCXXGlobalInitFunc2 {\n"
+    "   EmitCXXGlobalInitFunc2() {}\n"
+    "} test2;";
+
+
+/// An incremental version of ParseAST().
+static std::unique_ptr<llvm::Module>
+IncrementalParseAST(CompilerInstance& CI, Parser& P,
+                    CodeGenerator& CG, const char* code) {
+  static int counter = 0;
+  struct IncreaseCounterOnRet {
+    ~IncreaseCounterOnRet() {
+      ++counter;
+    }
+  } ICOR;
+
+  Sema& S = CI.getSema();
+  clang::SourceManager &SM = S.getSourceManager();
+  if (!code) {
+    // Main file
+    SM.setMainFileID(SM.createFileID(
+        llvm::MemoryBuffer::getMemBuffer("    "), clang::SrcMgr::C_User));
+
+    S.getPreprocessor().EnterMainSourceFile();
+    P.Initialize();
+  } else {
+    FileID FID = SM.createFileID(
+        llvm::MemoryBuffer::getMemBuffer(code), clang::SrcMgr::C_User);
+    SourceLocation MainStartLoc = SM.getLocForStartOfFile(SM.getMainFileID());
+    SourceLocation InclLoc = MainStartLoc.getLocWithOffset(counter);
+    S.getPreprocessor().EnterSourceFile(FID, 0, InclLoc);
+  }
+
+  ExternalASTSource *External = S.getASTContext().getExternalSource();
+  if (External)
+    External->StartTranslationUnit(&CG);
+
+  Parser::DeclGroupPtrTy ADecl;
+  for (bool AtEOF = P.ParseFirstTopLevelDecl(ADecl); !AtEOF;
+       AtEOF = P.ParseTopLevelDecl(ADecl)) {
+    // If we got a null return and something *was* parsed, ignore it.  This
+    // is due to a top-level semicolon, an action override, or a parse error
+    // skipping something.
+    if (ADecl && !CG.HandleTopLevelDecl(ADecl.get()))
+      return nullptr;
+  }
+
+  // Process any TopLevelDecls generated by #pragma weak.
+  for (Decl *D : S.WeakTopLevelDecls())
+    CG.HandleTopLevelDecl(DeclGroupRef(D));
+
+  CG.HandleTranslationUnit(S.getASTContext());
+
+  std::unique_ptr<llvm::Module> M(CG.ReleaseModule());
+  // Switch to next module.
+  CG.StartModule("incremental-module-" + std::to_string(counter),
+                 M->getContext());
+  return M;
+}
+
+const Function* getGlobalInit(llvm::Module& M) {
+  for (const auto& Func: M)
+    if (Func.hasName() && Func.getName().startswith("_GLOBAL__sub_I_"))
+      return &Func;
+
+  return nullptr;
+}
+
+TEST(IncrementalProcessing, EmitCXXGlobalInitFunc) {
+    LLVMContext Context;
+    CompilerInstance compiler;
+
+    compiler.createDiagnostics();
+    compiler.getLangOpts().CPlusPlus = 1;
+    compiler.getLangOpts().CPlusPlus11 = 1;
+
+    compiler.getTargetOpts().Triple = llvm::Triple::normalize(
+        llvm::sys::getProcessTriple());
+    compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+      compiler.getDiagnostics(),
+      std::make_shared<clang::TargetOptions>(
+        compiler.getTargetOpts())));
+
+    compiler.createFileManager();
+    compiler.createSourceManager(compiler.getFileManager());
+    compiler.createPreprocessor(clang::TU_Prefix);
+    compiler.getPreprocessor().enableIncrementalProcessing();
+
+    compiler.createASTContext();
+
+    CodeGenerator* CG =
+        CreateLLVMCodeGen(
+            compiler.getDiagnostics(),
+            "main-module",
+            compiler.getHeaderSearchOpts(),
+            compiler.getPreprocessorOpts(),
+            compiler.getCodeGenOpts(),
+            Context);
+    compiler.setASTConsumer(std::unique_ptr<ASTConsumer>(CG));
+    compiler.createSema(clang::TU_Prefix, nullptr);
+    Sema& S = compiler.getSema();
+
+    std::unique_ptr<Parser> ParseOP(new Parser(S.getPreprocessor(), S,
+                                               /*SkipFunctionBodies*/ false));
+    Parser &P = *ParseOP.get();
+
+    std::array<std::unique_ptr<llvm::Module>, 3> M;
+    M[0] = IncrementalParseAST(compiler, P, *CG, nullptr);
+    ASSERT_TRUE(M[0]);
+
+    M[1] = IncrementalParseAST(compiler, P, *CG, TestProgram1);
+    ASSERT_TRUE(M[1]);
+    ASSERT_TRUE(M[1]->getFunction("funcForProg1"));
+
+    M[2] = IncrementalParseAST(compiler, P, *CG, TestProgram2);
+    ASSERT_TRUE(M[2]);
+    ASSERT_TRUE(M[2]->getFunction("funcForProg2"));
+    // First code should not end up in second module:
+    ASSERT_FALSE(M[2]->getFunction("funcForProg1"));
+
+    // Make sure global inits exist and are unique:
+    const Function* GlobalInit1 = getGlobalInit(*M[1]);
+    ASSERT_TRUE(GlobalInit1);
+
+    const Function* GlobalInit2 = getGlobalInit(*M[2]);
+    ASSERT_TRUE(GlobalInit2);
+
+    ASSERT_FALSE(GlobalInit1->getName() == GlobalInit2->getName());
+
+}
+
+} // end anonymous namespace