f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
//===--- HeaderIncludes.cpp - Generate Header Includes --------------------===//
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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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#include "clang/Frontend/Utils.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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namespace {
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class HeaderIncludesCallback : public PPCallbacks {
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SourceManager &SM;
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raw_ostream *OutputFile;
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unsigned CurrentIncludeDepth;
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bool HasProcessedPredefines;
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bool OwnsOutputFile;
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bool ShowAllHeaders;
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bool ShowDepth;
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bool MSStyle;
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public:
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HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_,
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raw_ostream *OutputFile_, bool OwnsOutputFile_,
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bool ShowDepth_, bool MSStyle_)
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: SM(PP->getSourceManager()), OutputFile(OutputFile_),
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CurrentIncludeDepth(0), HasProcessedPredefines(false),
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OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
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ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
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~HeaderIncludesCallback() {
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if (OwnsOutputFile)
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delete OutputFile;
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}
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virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
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SrcMgr::CharacteristicKind FileType,
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FileID PrevFID);
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};
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}
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void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders,
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StringRef OutputPath, bool ShowDepth,
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bool MSStyle) {
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raw_ostream *OutputFile = &llvm::errs();
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bool OwnsOutputFile = false;
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// Open the output file, if used.
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if (!OutputPath.empty()) {
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std::string Error;
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llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
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OutputPath.str().c_str(), Error, llvm::sys::fs::F_Append);
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if (!Error.empty()) {
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PP.getDiagnostics().Report(
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clang::diag::warn_fe_cc_print_header_failure) << Error;
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delete OS;
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} else {
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OS->SetUnbuffered();
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OS->SetUseAtomicWrites(true);
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OutputFile = OS;
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OwnsOutputFile = true;
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}
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}
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PP.addPPCallbacks(new HeaderIncludesCallback(&PP, ShowAllHeaders,
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OutputFile, OwnsOutputFile,
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ShowDepth, MSStyle));
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}
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void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
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FileChangeReason Reason,
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SrcMgr::CharacteristicKind NewFileType,
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FileID PrevFID) {
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// Unless we are exiting a #include, make sure to skip ahead to the line the
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// #include directive was at.
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PresumedLoc UserLoc = SM.getPresumedLoc(Loc);
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if (UserLoc.isInvalid())
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return;
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// Adjust the current include depth.
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if (Reason == PPCallbacks::EnterFile) {
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++CurrentIncludeDepth;
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} else if (Reason == PPCallbacks::ExitFile) {
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if (CurrentIncludeDepth)
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--CurrentIncludeDepth;
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// We track when we are done with the predefines by watching for the first
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// place where we drop back to a nesting depth of 1.
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if (CurrentIncludeDepth == 1 && !HasProcessedPredefines)
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HasProcessedPredefines = true;
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return;
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} else
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return;
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// Show the header if we are (a) past the predefines, or (b) showing all
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// headers and in the predefines at a depth past the initial file and command
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// line buffers.
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bool ShowHeader = (HasProcessedPredefines ||
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(ShowAllHeaders && CurrentIncludeDepth > 2));
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// Dump the header include information we are past the predefines buffer or
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// are showing all headers.
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if (ShowHeader && Reason == PPCallbacks::EnterFile) {
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// Write to a temporary string to avoid unnecessary flushing on errs().
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SmallString<512> Filename(UserLoc.getFilename());
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if (!MSStyle)
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Lexer::Stringify(Filename);
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SmallString<256> Msg;
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if (MSStyle)
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Msg += "Note: including file:";
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if (ShowDepth) {
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// The main source file is at depth 1, so skip one dot.
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for (unsigned i = 1; i != CurrentIncludeDepth; ++i)
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Msg += MSStyle ? ' ' : '.';
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if (!MSStyle)
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Msg += ' ';
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}
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Msg += Filename;
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Msg += '\n';
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OutputFile->write(Msg.data(), Msg.size());
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}
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}
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