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//===--- HeaderIncludes.cpp - Generate Header Includes --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/Utils.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
namespace {
class HeaderIncludesCallback : public PPCallbacks {
SourceManager &SM;
raw_ostream *OutputFile;
unsigned CurrentIncludeDepth;
bool HasProcessedPredefines;
bool OwnsOutputFile;
bool ShowAllHeaders;
bool ShowDepth;
bool MSStyle;
public:
HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_,
raw_ostream *OutputFile_, bool OwnsOutputFile_,
bool ShowDepth_, bool MSStyle_)
: SM(PP->getSourceManager()), OutputFile(OutputFile_),
CurrentIncludeDepth(0), HasProcessedPredefines(false),
OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
~HeaderIncludesCallback() override {
if (OwnsOutputFile)
delete OutputFile;
}
void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType,
FileID PrevFID) override;
};
}
static void PrintHeaderInfo(raw_ostream *OutputFile, const char* Filename,
bool ShowDepth, unsigned CurrentIncludeDepth,
bool MSStyle) {
// Write to a temporary string to avoid unnecessary flushing on errs().
SmallString<512> Pathname(Filename);
if (!MSStyle)
Lexer::Stringify(Pathname);
SmallString<256> Msg;
if (MSStyle)
Msg += "Note: including file:";
if (ShowDepth) {
// The main source file is at depth 1, so skip one dot.
for (unsigned i = 1; i != CurrentIncludeDepth; ++i)
Msg += MSStyle ? ' ' : '.';
if (!MSStyle)
Msg += ' ';
}
Msg += Pathname;
Msg += '\n';
OutputFile->write(Msg.data(), Msg.size());
OutputFile->flush();
}
void clang::AttachHeaderIncludeGen(Preprocessor &PP,
const std::vector<std::string> &ExtraHeaders,
bool ShowAllHeaders,
StringRef OutputPath, bool ShowDepth,
bool MSStyle) {
raw_ostream *OutputFile = MSStyle ? &llvm::outs() : &llvm::errs();
bool OwnsOutputFile = false;
// Open the output file, if used.
if (!OutputPath.empty()) {
std::error_code EC;
llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
OutputPath.str(), EC, llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
if (EC) {
PP.getDiagnostics().Report(clang::diag::warn_fe_cc_print_header_failure)
<< EC.message();
delete OS;
} else {
OS->SetUnbuffered();
OS->SetUseAtomicWrites(true);
OutputFile = OS;
OwnsOutputFile = true;
}
}
// Print header info for extra headers, pretending they were discovered
// by the regular preprocessor. The primary use case is to support
// proper generation of Make / Ninja file dependencies for implicit includes,
// such as sanitizer blacklists. It's only important for cl.exe
// compatibility, the GNU way to generate rules is -M / -MM / -MD / -MMD.
for (auto Header : ExtraHeaders) {
PrintHeaderInfo(OutputFile, Header.c_str(), ShowDepth, 2, MSStyle);
}
PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(&PP,
ShowAllHeaders,
OutputFile,
OwnsOutputFile,
ShowDepth,
MSStyle));
}
void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
FileChangeReason Reason,
SrcMgr::CharacteristicKind NewFileType,
FileID PrevFID) {
// Unless we are exiting a #include, make sure to skip ahead to the line the
// #include directive was at.
PresumedLoc UserLoc = SM.getPresumedLoc(Loc);
if (UserLoc.isInvalid())
return;
// Adjust the current include depth.
if (Reason == PPCallbacks::EnterFile) {
++CurrentIncludeDepth;
} else if (Reason == PPCallbacks::ExitFile) {
if (CurrentIncludeDepth)
--CurrentIncludeDepth;
// We track when we are done with the predefines by watching for the first
// place where we drop back to a nesting depth of 1.
if (CurrentIncludeDepth == 1 && !HasProcessedPredefines)
HasProcessedPredefines = true;
return;
} else
return;
// Show the header if we are (a) past the predefines, or (b) showing all
// headers and in the predefines at a depth past the initial file and command
// line buffers.
bool ShowHeader = (HasProcessedPredefines ||
(ShowAllHeaders && CurrentIncludeDepth > 2));
// Dump the header include information we are past the predefines buffer or
// are showing all headers.
if (ShowHeader && Reason == PPCallbacks::EnterFile) {
PrintHeaderInfo(OutputFile, UserLoc.getFilename(),
ShowDepth, CurrentIncludeDepth, MSStyle);
}
}
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