clang/unittests/CodeGen/TestCompiler.h

   1 //=== unittests/CodeGen/TestCompiler.h - Match on the LLVM IR ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef CLANG_UNITTESTS_CODEGEN_TESTCOMPILER_H
  10 #define CLANG_UNITTESTS_CODEGEN_TESTCOMPILER_H
  11
  12
  13 #include "clang/AST/ASTConsumer.h"
  14 #include "clang/Basic/TargetInfo.h"
  15 #include "clang/Basic/TargetOptions.h"
  16 #include "clang/CodeGen/ModuleBuilder.h"
  17 #include "clang/Frontend/CompilerInstance.h"
  18 #include "clang/Parse/ParseAST.h"
  19
  20 #include "llvm/IR/Constants.h"
  21 #include "llvm/IR/LLVMContext.h"
  22 #include "llvm/IR/Module.h"
  23 #include "llvm/TargetParser/Host.h"
  24
  25 namespace llvm {
  26
  27 struct TestCompiler {
  28   LLVMContext Context;
  29   clang::CompilerInstance compiler;
  30   std::unique_ptr<clang::CodeGenerator> CG;
  31   llvm::Module *M = nullptr;
  32   unsigned PtrSize = 0;
  33
  34   TestCompiler(clang::LangOptions LO,
  35                clang::CodeGenOptions CGO = clang::CodeGenOptions()) {
  36     compiler.getLangOpts() = LO;
  37     compiler.getCodeGenOpts() = CGO;
  38     compiler.createDiagnostics();
  39
  40     std::string TrStr = llvm::Triple::normalize(llvm::sys::getProcessTriple());
  41     llvm::Triple Tr(TrStr);
  42     Tr.setOS(Triple::Linux);
  43     Tr.setVendor(Triple::VendorType::UnknownVendor);
  44     Tr.setEnvironment(Triple::EnvironmentType::UnknownEnvironment);
  45     compiler.getTargetOpts().Triple = Tr.getTriple();
  46     compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
  47         compiler.getDiagnostics(),
  48         std::make_shared<clang::TargetOptions>(compiler.getTargetOpts())));
  49
  50     const clang::TargetInfo &TInfo = compiler.getTarget();
  51     PtrSize = TInfo.getPointerWidth(clang::LangAS::Default) / 8;
  52
  53     compiler.createFileManager();
  54     compiler.createSourceManager(compiler.getFileManager());
  55     compiler.createPreprocessor(clang::TU_Prefix);
  56
  57     compiler.createASTContext();
  58
  59     CG.reset(CreateLLVMCodeGen(
  60         compiler.getDiagnostics(), "main-module",
  61         &compiler.getVirtualFileSystem(), compiler.getHeaderSearchOpts(),
  62         compiler.getPreprocessorOpts(), compiler.getCodeGenOpts(), Context));
  63   }
  64
  65   void init(const char *TestProgram,
  66             std::unique_ptr<clang::ASTConsumer> Consumer = nullptr) {
  67     if (!Consumer)
  68       Consumer = std::move(CG);
  69
  70     compiler.setASTConsumer(std::move(Consumer));
  71
  72     compiler.createSema(clang::TU_Prefix, nullptr);
  73
  74     clang::SourceManager &sm = compiler.getSourceManager();
  75     sm.setMainFileID(sm.createFileID(
  76         llvm::MemoryBuffer::getMemBuffer(TestProgram), clang::SrcMgr::C_User));
  77   }
  78
  79   const BasicBlock *compile() {
  80     clang::ParseAST(compiler.getSema(), false, false);
  81     M =
  82       static_cast<clang::CodeGenerator&>(compiler.getASTConsumer()).GetModule();
  83
  84     // Do not expect more than one function definition.
  85     auto FuncPtr = M->begin();
  86     for (; FuncPtr != M->end(); ++FuncPtr)
  87       if (!FuncPtr->isDeclaration())
  88         break;
  89     assert(FuncPtr != M->end());
  90     const llvm::Function &Func = *FuncPtr;
  91     ++FuncPtr;
  92     for (; FuncPtr != M->end(); ++FuncPtr)
  93       if (!FuncPtr->isDeclaration())
  94         break;
  95     assert(FuncPtr == M->end());
  96
  97     // The function must consist of single basic block.
  98     auto BBPtr = Func.begin();
  99     assert(Func.begin() != Func.end());
 100     const BasicBlock &BB = *BBPtr;
 101     ++BBPtr;
 102     assert(BBPtr == Func.end());
 103
 104     return &BB;
 105   }
 106 };
 107
 108 } // namespace llvm
 109 #endif // CLANG_UNITTESTS_CODEGEN_TESTCOMPILER_H