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