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//=== unittests/CodeGen/IncrementalProcessingTest.cpp - IncrementalCodeGen ===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#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
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