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/Support/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(0) / 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 
compileTestCompiler79   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
110