forked from OSchip/llvm-project
83 lines
2.8 KiB
C++
83 lines
2.8 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/Lex/Preprocessor.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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unsigned CurrentIncludeDepth;
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bool ShowAllHeaders;
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bool HasProcessedPredefines;
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public:
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HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_)
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: SM(PP->getSourceManager()), CurrentIncludeDepth(0),
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ShowAllHeaders(ShowAllHeaders_), HasProcessedPredefines(false) {}
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virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
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SrcMgr::CharacteristicKind FileType);
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};
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}
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void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders,
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llvm::StringRef OutputPath) {
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PP.addPPCallbacks(new HeaderIncludesCallback(&PP, ShowAllHeaders));
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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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// 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 {
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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 0.
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if (CurrentIncludeDepth == 0 && !HasProcessedPredefines)
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HasProcessedPredefines = true;
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}
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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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llvm::SmallString<512> Filename(UserLoc.getFilename());
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Lexer::Stringify(Filename);
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llvm::SmallString<256> Msg;
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for (unsigned i = 0; i != CurrentIncludeDepth; ++i)
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Msg += '.';
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Msg += ' ';
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Msg += Filename;
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Msg += '\n';
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llvm::errs() << Msg;
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}
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}
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