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a75b2cac71
This is the first commit for the "Clang-based C/C++ diff tool" GSoC project. ASTDiff is a new library that computes a structural AST diff between two ASTs using the gumtree algorithm. Clang-diff is a new Clang tool that will show the structural code changes between different ASTs. Patch by Johannes Altmanninger! Differential Revision: https://reviews.llvm.org/D34329 llvm-svn: 308731
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
//===- ClangDiff.cpp - compare source files by AST nodes ------*- C++ -*- -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a tool for syntax tree based comparison using
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// Tooling/ASTDiff.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Tooling/ASTDiff/ASTDiff.h"
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#include "clang/Tooling/CommonOptionsParser.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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using namespace clang;
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using namespace clang::tooling;
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static cl::OptionCategory ClangDiffCategory("clang-diff options");
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static cl::opt<bool>
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DumpAST("ast-dump",
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cl::desc("Print the internal representation of the AST as JSON."),
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cl::init(false), cl::cat(ClangDiffCategory));
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static cl::opt<bool> NoCompilationDatabase(
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"no-compilation-database",
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cl::desc(
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"Do not attempt to load build settings from a compilation database"),
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cl::init(false), cl::cat(ClangDiffCategory));
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static cl::opt<std::string> SourcePath(cl::Positional, cl::desc("<source>"),
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cl::Required,
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cl::cat(ClangDiffCategory));
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static cl::opt<std::string> DestinationPath(cl::Positional,
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cl::desc("<destination>"),
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cl::Optional,
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cl::cat(ClangDiffCategory));
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static std::unique_ptr<ASTUnit> getAST(const StringRef Filename) {
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std::string ErrorMessage;
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std::unique_ptr<CompilationDatabase> Compilations;
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if (!NoCompilationDatabase)
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Compilations =
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CompilationDatabase::autoDetectFromSource(Filename, ErrorMessage);
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if (!Compilations) {
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if (!NoCompilationDatabase)
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llvm::errs()
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<< "Error while trying to load a compilation database, running "
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"without flags.\n"
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<< ErrorMessage;
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Compilations = llvm::make_unique<clang::tooling::FixedCompilationDatabase>(
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".", std::vector<std::string>());
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}
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std::array<std::string, 1> Files = {{Filename}};
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ClangTool Tool(*Compilations, Files);
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std::vector<std::unique_ptr<ASTUnit>> ASTs;
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Tool.buildASTs(ASTs);
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if (ASTs.size() != Files.size())
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return nullptr;
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return std::move(ASTs[0]);
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}
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int main(int argc, const char **argv) {
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cl::HideUnrelatedOptions(ClangDiffCategory);
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if (!cl::ParseCommandLineOptions(argc, argv)) {
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cl::PrintOptionValues();
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return 1;
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}
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if (DumpAST) {
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if (!DestinationPath.empty()) {
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llvm::errs() << "Error: Please specify exactly one filename.\n";
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return 1;
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}
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std::unique_ptr<ASTUnit> AST = getAST(SourcePath);
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if (!AST)
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return 1;
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diff::SyntaxTree Tree(AST->getASTContext());
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Tree.printAsJson(llvm::outs());
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return 0;
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}
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if (DestinationPath.empty()) {
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llvm::errs() << "Error: Exactly two paths are required.\n";
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return 1;
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}
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std::unique_ptr<ASTUnit> Src = getAST(SourcePath);
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std::unique_ptr<ASTUnit> Dst = getAST(DestinationPath);
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if (!Src || !Dst)
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return 1;
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diff::ComparisonOptions Options;
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diff::SyntaxTree SrcTree(Src->getASTContext());
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diff::SyntaxTree DstTree(Dst->getASTContext());
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diff::ASTDiff DiffTool(SrcTree, DstTree, Options);
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for (const auto &Match : DiffTool.getMatches())
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DiffTool.printMatch(llvm::outs(), Match);
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for (const auto &Change : DiffTool.getChanges())
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DiffTool.printChange(llvm::outs(), Change);
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return 0;
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}
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