forked from OSchip/llvm-project
234 lines
7.7 KiB
C++
234 lines
7.7 KiB
C++
//===--- tools/pp-trace/PPTrace.cpp - Clang preprocessor tracer -----------===//
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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 pp-trace, a tool for displaying a textual trace
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// of the Clang preprocessor activity. It's based on a derivation of the
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// PPCallbacks class, that once registerd with Clang, receives callback calls
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// to its virtual members, and outputs the information passed to the callbacks
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// in a high-level YAML format.
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//
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// The pp-trace tool also serves as the basis for a test of the PPCallbacks
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// mechanism.
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//
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// The pp-trace tool supports the following general command line format:
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//
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// pp-trace [pp-trace options] (source file) [compiler options]
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//
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// Basically you put the pp-trace options first, then the source file or files,
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// and then any options you want to pass to the compiler.
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//
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// These are the pp-trace options:
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//
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// -ignore (callback list) Don't display output for a comma-separated
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// list of callbacks, i.e.:
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// -ignore "FileChanged,InclusionDirective"
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//
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// -output (file) Output trace to the given file in a YAML
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// format, e.g.:
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//
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// ---
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// - Callback: Name
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// Argument1: Value1
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// Argument2: Value2
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// (etc.)
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// ...
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//
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// Future Directions:
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//
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// 1. Add option opposite to "-ignore" that specifys a comma-separated option
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// list of callbacs. Perhaps "-only" or "-exclusive".
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//
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//===----------------------------------------------------------------------===//
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#include "PPCallbacksTracker.h"
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#include "clang/AST/ASTConsumer.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/RecursiveASTVisitor.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Driver/Options.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendActions.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Tooling/CompilationDatabase.h"
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#include "clang/Tooling/Tooling.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/OptTable.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.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/ToolOutputFile.h"
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#include <algorithm>
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#include <fstream>
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#include <iterator>
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#include <string>
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#include <vector>
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using namespace clang;
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using namespace clang::driver;
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using namespace clang::driver::options;
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using namespace clang::tooling;
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using namespace llvm;
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using namespace llvm::opt;
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// Options:
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// Collect the source files.
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static cl::list<std::string> SourcePaths(cl::Positional,
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cl::desc("<source0> [... <sourceN>]"),
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cl::OneOrMore);
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// Option to specify a list or one or more callback names to ignore.
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static cl::opt<std::string> IgnoreCallbacks(
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"ignore", cl::init(""),
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cl::desc("Ignore callbacks, i.e. \"Callback1, Callback2...\"."));
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// Option to specify the trace output file name.
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static cl::opt<std::string> OutputFileName(
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"output", cl::init(""),
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cl::desc("Output trace to the given file name or '-' for stdout."));
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// Collect all other arguments, which will be passed to the front end.
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static cl::list<std::string>
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CC1Arguments(cl::ConsumeAfter,
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cl::desc("<arguments to be passed to front end>..."));
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// Frontend action stuff:
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namespace {
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// Consumer is responsible for setting up the callbacks.
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class PPTraceConsumer : public ASTConsumer {
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public:
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PPTraceConsumer(SmallSet<std::string, 4> &Ignore,
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std::vector<CallbackCall> &CallbackCalls, Preprocessor &PP) {
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// PP takes ownership.
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PP.addPPCallbacks(llvm::make_unique<PPCallbacksTracker>(Ignore,
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CallbackCalls, PP));
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}
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};
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class PPTraceAction : public SyntaxOnlyAction {
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public:
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PPTraceAction(SmallSet<std::string, 4> &Ignore,
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std::vector<CallbackCall> &CallbackCalls)
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: Ignore(Ignore), CallbackCalls(CallbackCalls) {}
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protected:
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std::unique_ptr<clang::ASTConsumer>
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CreateASTConsumer(CompilerInstance &CI, StringRef InFile) override {
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return llvm::make_unique<PPTraceConsumer>(Ignore, CallbackCalls,
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CI.getPreprocessor());
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}
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private:
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SmallSet<std::string, 4> &Ignore;
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std::vector<CallbackCall> &CallbackCalls;
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};
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class PPTraceFrontendActionFactory : public FrontendActionFactory {
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public:
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PPTraceFrontendActionFactory(SmallSet<std::string, 4> &Ignore,
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std::vector<CallbackCall> &CallbackCalls)
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: Ignore(Ignore), CallbackCalls(CallbackCalls) {}
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PPTraceAction *create() override {
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return new PPTraceAction(Ignore, CallbackCalls);
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}
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private:
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SmallSet<std::string, 4> &Ignore;
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std::vector<CallbackCall> &CallbackCalls;
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};
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} // namespace
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// Output the trace given its data structure and a stream.
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static int outputPPTrace(std::vector<CallbackCall> &CallbackCalls,
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llvm::raw_ostream &OS) {
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// Mark start of document.
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OS << "---\n";
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for (std::vector<CallbackCall>::const_iterator I = CallbackCalls.begin(),
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E = CallbackCalls.end();
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I != E; ++I) {
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const CallbackCall &Callback = *I;
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OS << "- Callback: " << Callback.Name << "\n";
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for (auto AI = Callback.Arguments.begin(), AE = Callback.Arguments.end();
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AI != AE; ++AI) {
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const Argument &Arg = *AI;
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OS << " " << Arg.Name << ": " << Arg.Value << "\n";
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}
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}
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// Mark end of document.
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OS << "...\n";
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return 0;
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}
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// Program entry point.
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int main(int Argc, const char **Argv) {
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// Parse command line.
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cl::ParseCommandLineOptions(Argc, Argv, "pp-trace.\n");
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// Parse the IgnoreCallbacks list into strings.
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SmallVector<StringRef, 32> IgnoreCallbacksStrings;
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StringRef(IgnoreCallbacks).split(IgnoreCallbacksStrings, ",",
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/*MaxSplit=*/ -1, /*KeepEmpty=*/false);
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SmallSet<std::string, 4> Ignore;
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for (SmallVector<StringRef, 32>::iterator I = IgnoreCallbacksStrings.begin(),
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E = IgnoreCallbacksStrings.end();
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I != E; ++I)
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Ignore.insert(*I);
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// Create the compilation database.
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SmallString<256> PathBuf;
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sys::fs::current_path(PathBuf);
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std::unique_ptr<CompilationDatabase> Compilations;
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Compilations.reset(
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new FixedCompilationDatabase(Twine(PathBuf), CC1Arguments));
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// Store the callback trace information here.
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std::vector<CallbackCall> CallbackCalls;
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// Create the tool and run the compilation.
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ClangTool Tool(*Compilations, SourcePaths);
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PPTraceFrontendActionFactory Factory(Ignore, CallbackCalls);
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int HadErrors = Tool.run(&Factory);
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// If we had errors, exit early.
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if (HadErrors)
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return HadErrors;
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// Do the output.
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if (!OutputFileName.size()) {
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HadErrors = outputPPTrace(CallbackCalls, llvm::outs());
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} else {
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// Set up output file.
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std::error_code EC;
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llvm::ToolOutputFile Out(OutputFileName, EC, llvm::sys::fs::F_Text);
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if (EC) {
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llvm::errs() << "pp-trace: error creating " << OutputFileName << ":"
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<< EC.message() << "\n";
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return 1;
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}
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HadErrors = outputPPTrace(CallbackCalls, Out.os());
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// Tell ToolOutputFile that we want to keep the file.
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if (HadErrors == 0)
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Out.keep();
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}
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return HadErrors;
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}
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