forked from OSchip/llvm-project
109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
//===- examples/Tooling/ClangCheck.cpp - Clang check tool -----------------===//
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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 clang-check tool that runs the
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// clang::SyntaxOnlyAction over a number of translation units.
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//
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// Usage:
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// clang-check <cmake-output-dir> <file1> <file2> ...
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//
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// Where <cmake-output-dir> is a CMake build directory in which a file named
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// compile_commands.json exists (enable -DCMAKE_EXPORT_COMPILE_COMMANDS in
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// CMake to get this output).
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//
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// <file1> ... specify the paths of files in the CMake source tree. This path
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// is looked up in the compile command database. If the path of a file is
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// absolute, it needs to point into CMake's source tree. If the path is
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// relative, the current working directory needs to be in the CMake source
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// tree and the file must be in a subdirectory of the current working
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// directory. "./" prefixes in the relative files will be automatically
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// removed, but the rest of a relative path must be a suffix of a path in
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// the compile command line database.
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//
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// For example, to use clang-check on all files in a subtree of the source
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// tree, use:
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//
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// /path/in/subtree $ find . -name '*.cpp'| xargs clang-check /path/to/source
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Frontend/FrontendActions.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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/// \brief Returns the absolute path of 'File', by prepending it with
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/// 'BaseDirectory' if 'File' is not absolute. Otherwise returns 'File'.
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/// If 'File' starts with "./", the returned path will not contain the "./".
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/// Otherwise, the returned path will contain the literal path-concatenation of
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/// 'BaseDirectory' and 'File'.
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///
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/// \param File Either an absolute or relative path.
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/// \param BaseDirectory An absolute path.
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///
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/// FIXME: Put this somewhere where it is more generally available.
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static std::string GetAbsolutePath(
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llvm::StringRef File, llvm::StringRef BaseDirectory) {
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assert(llvm::sys::path::is_absolute(BaseDirectory));
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if (llvm::sys::path::is_absolute(File)) {
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return File;
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}
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llvm::StringRef RelativePath(File);
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if (RelativePath.startswith("./")) {
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RelativePath = RelativePath.substr(strlen("./"));
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}
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llvm::SmallString<1024> AbsolutePath(BaseDirectory);
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llvm::sys::path::append(AbsolutePath, RelativePath);
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return AbsolutePath.str();
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}
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int main(int argc, char **argv) {
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if (argc < 3) {
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llvm::outs() << "Usage: " << argv[0] << " <cmake-output-dir> "
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<< "<file1> <file2> ...\n";
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return 1;
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}
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// FIXME: We should pull how to find the database into the Tooling package.
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llvm::OwningPtr<llvm::MemoryBuffer> JsonDatabase;
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llvm::SmallString<1024> JsonDatabasePath(argv[1]);
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llvm::sys::path::append(JsonDatabasePath, "compile_commands.json");
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llvm::error_code Result =
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llvm::MemoryBuffer::getFile(JsonDatabasePath, JsonDatabase);
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if (Result != 0) {
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llvm::outs() << "Error while opening JSON database: " << Result.message()
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<< "\n";
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return 1;
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}
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llvm::StringRef BaseDirectory(::getenv("PWD"));
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for (int I = 2; I < argc; ++I) {
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llvm::SmallString<1024> File(GetAbsolutePath(argv[I], BaseDirectory));
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llvm::outs() << "Processing " << File << ".\n";
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std::string ErrorMessage;
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clang::tooling::CompileCommand LookupResult =
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clang::tooling::FindCompileArgsInJsonDatabase(
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File.str(), JsonDatabase->getBuffer(), ErrorMessage);
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if (!LookupResult.CommandLine.empty()) {
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if (!clang::tooling::RunToolWithFlags(
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new clang::SyntaxOnlyAction,
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LookupResult.CommandLine.size(),
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clang::tooling::CommandLineToArgv(
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&LookupResult.CommandLine).data())) {
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llvm::outs() << "Error while processing " << File << ".\n";
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}
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} else {
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llvm::outs() << "Skipping " << File << ". Command line not found.\n";
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}
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}
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return 0;
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}
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