2011-12-17 13:26:04 +08:00
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//===--- DiagnosticRenderer.cpp - Diagnostic Pretty-Printing --------------===//
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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/DiagnosticRenderer.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/DiagnosticOptions.h"
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#include "clang/Lex/Lexer.h"
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2012-03-07 04:06:33 +08:00
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#include "clang/Edit/EditedSource.h"
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#include "clang/Edit/Commit.h"
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#include "clang/Edit/EditsReceiver.h"
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2011-12-17 13:26:04 +08:00
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/ADT/SmallString.h"
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#include <algorithm>
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using namespace clang;
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2012-01-24 00:58:33 +08:00
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/// \brief Retrieve the name of the immediate macro expansion.
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///
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/// This routine starts from a source location, and finds the name of the macro
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/// responsible for its immediate expansion. It looks through any intervening
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/// macro argument expansions to compute this. It returns a StringRef which
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/// refers to the SourceManager-owned buffer of the source where that macro
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/// name is spelled. Thus, the result shouldn't out-live that SourceManager.
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///
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/// This differs from Lexer::getImmediateMacroName in that any macro argument
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/// location will result in the topmost function macro that accepted it.
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/// e.g.
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/// \code
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/// MAC1( MAC2(foo) )
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/// \endcode
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/// for location of 'foo' token, this function will return "MAC1" while
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/// Lexer::getImmediateMacroName will return "MAC2".
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static StringRef getImmediateMacroName(SourceLocation Loc,
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const SourceManager &SM,
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const LangOptions &LangOpts) {
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assert(Loc.isMacroID() && "Only reasonble to call this on macros");
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// Walk past macro argument expanions.
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while (SM.isMacroArgExpansion(Loc))
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Loc = SM.getImmediateExpansionRange(Loc).first;
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// Find the spelling location of the start of the non-argument expansion
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// range. This is where the macro name was spelled in order to begin
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// expanding this macro.
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Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
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// Dig out the buffer where the macro name was spelled and the extents of the
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// name so that we can render it into the expansion note.
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std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
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unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
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StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
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return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
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}
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2012-05-10 13:03:45 +08:00
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DiagnosticRenderer::DiagnosticRenderer(const LangOptions &LangOpts,
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2011-12-17 13:26:04 +08:00
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const DiagnosticOptions &DiagOpts)
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: LangOpts(LangOpts), DiagOpts(DiagOpts), LastLevel() {}
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2011-12-17 13:26:04 +08:00
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DiagnosticRenderer::~DiagnosticRenderer() {}
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2012-03-07 04:06:33 +08:00
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namespace {
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class FixitReceiver : public edit::EditsReceiver {
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SmallVectorImpl<FixItHint> &MergedFixits;
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public:
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FixitReceiver(SmallVectorImpl<FixItHint> &MergedFixits)
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: MergedFixits(MergedFixits) { }
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virtual void insert(SourceLocation loc, StringRef text) {
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MergedFixits.push_back(FixItHint::CreateInsertion(loc, text));
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}
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virtual void replace(CharSourceRange range, StringRef text) {
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MergedFixits.push_back(FixItHint::CreateReplacement(range, text));
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}
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};
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}
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static void mergeFixits(ArrayRef<FixItHint> FixItHints,
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const SourceManager &SM, const LangOptions &LangOpts,
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SmallVectorImpl<FixItHint> &MergedFixits) {
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edit::Commit commit(SM, LangOpts);
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for (ArrayRef<FixItHint>::const_iterator
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I = FixItHints.begin(), E = FixItHints.end(); I != E; ++I) {
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const FixItHint &Hint = *I;
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if (Hint.CodeToInsert.empty()) {
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if (Hint.InsertFromRange.isValid())
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commit.insertFromRange(Hint.RemoveRange.getBegin(),
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Hint.InsertFromRange, /*afterToken=*/false,
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Hint.BeforePreviousInsertions);
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else
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commit.remove(Hint.RemoveRange);
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} else {
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if (Hint.RemoveRange.isTokenRange() ||
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Hint.RemoveRange.getBegin() != Hint.RemoveRange.getEnd())
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commit.replace(Hint.RemoveRange, Hint.CodeToInsert);
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else
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commit.insert(Hint.RemoveRange.getBegin(), Hint.CodeToInsert,
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/*afterToken=*/false, Hint.BeforePreviousInsertions);
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}
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}
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edit::EditedSource Editor(SM, LangOpts);
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if (Editor.commit(commit)) {
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FixitReceiver Rec(MergedFixits);
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Editor.applyRewrites(Rec);
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}
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}
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2011-12-17 13:26:04 +08:00
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void DiagnosticRenderer::emitDiagnostic(SourceLocation Loc,
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DiagnosticsEngine::Level Level,
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StringRef Message,
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ArrayRef<CharSourceRange> Ranges,
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ArrayRef<FixItHint> FixItHints,
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2012-05-10 13:03:45 +08:00
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const SourceManager *SM,
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2012-02-14 10:46:00 +08:00
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DiagOrStoredDiag D) {
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assert(SM || Loc.isInvalid());
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2011-12-17 13:26:04 +08:00
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2012-02-14 10:46:00 +08:00
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beginDiagnostic(D, Level);
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2011-12-17 13:26:04 +08:00
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2012-05-10 13:03:45 +08:00
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PresumedLoc PLoc;
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if (Loc.isValid()) {
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2012-06-19 04:12:05 +08:00
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PLoc = SM->getPresumedLocForDisplay(Loc);
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2011-12-17 13:26:04 +08:00
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2012-05-10 13:03:45 +08:00
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// First, if this diagnostic is not in the main file, print out the
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// "included from" lines.
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emitIncludeStack(PLoc.getIncludeLoc(), Level, *SM);
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}
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2011-12-17 13:26:04 +08:00
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// Next, emit the actual diagnostic message.
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emitDiagnosticMessage(Loc, PLoc, Level, Message, Ranges, SM, D);
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2011-12-17 13:26:04 +08:00
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// Only recurse if we have a valid location.
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if (Loc.isValid()) {
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// Get the ranges into a local array we can hack on.
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SmallVector<CharSourceRange, 20> MutableRanges(Ranges.begin(),
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Ranges.end());
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2012-03-07 04:06:33 +08:00
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llvm::SmallVector<FixItHint, 8> MergedFixits;
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if (!FixItHints.empty()) {
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2012-05-10 13:03:45 +08:00
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mergeFixits(FixItHints, *SM, LangOpts, MergedFixits);
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2012-03-07 04:06:33 +08:00
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FixItHints = MergedFixits;
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}
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2011-12-17 13:26:04 +08:00
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for (ArrayRef<FixItHint>::const_iterator I = FixItHints.begin(),
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E = FixItHints.end();
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I != E; ++I)
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if (I->RemoveRange.isValid())
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MutableRanges.push_back(I->RemoveRange);
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unsigned MacroDepth = 0;
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2012-05-10 13:03:45 +08:00
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emitMacroExpansionsAndCarets(Loc, Level, MutableRanges, FixItHints, *SM,
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2011-12-17 13:26:04 +08:00
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MacroDepth);
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}
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LastLoc = Loc;
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LastLevel = Level;
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2012-02-14 10:46:00 +08:00
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endDiagnostic(D, Level);
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}
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void DiagnosticRenderer::emitStoredDiagnostic(StoredDiagnostic &Diag) {
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emitDiagnostic(Diag.getLocation(), Diag.getLevel(), Diag.getMessage(),
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Diag.getRanges(), Diag.getFixIts(),
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Diag.getLocation().isValid() ? &Diag.getLocation().getManager()
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: 0,
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&Diag);
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2011-12-17 13:26:04 +08:00
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}
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/// \brief Prints an include stack when appropriate for a particular
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/// diagnostic level and location.
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///
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/// This routine handles all the logic of suppressing particular include
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/// stacks (such as those for notes) and duplicate include stacks when
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/// repeated warnings occur within the same file. It also handles the logic
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/// of customizing the formatting and display of the include stack.
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///
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/// \param Level The diagnostic level of the message this stack pertains to.
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/// \param Loc The include location of the current file (not the diagnostic
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/// location).
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void DiagnosticRenderer::emitIncludeStack(SourceLocation Loc,
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DiagnosticsEngine::Level Level,
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const SourceManager &SM) {
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2011-12-17 13:26:04 +08:00
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// Skip redundant include stacks altogether.
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if (LastIncludeLoc == Loc)
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return;
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LastIncludeLoc = Loc;
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if (!DiagOpts.ShowNoteIncludeStack && Level == DiagnosticsEngine::Note)
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return;
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2012-05-10 13:03:45 +08:00
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emitIncludeStackRecursively(Loc, SM);
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2011-12-17 13:26:04 +08:00
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}
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/// \brief Helper to recursivly walk up the include stack and print each layer
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/// on the way back down.
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2012-05-10 13:03:45 +08:00
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void DiagnosticRenderer::emitIncludeStackRecursively(SourceLocation Loc,
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const SourceManager &SM) {
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2011-12-17 13:26:04 +08:00
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if (Loc.isInvalid())
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return;
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PresumedLoc PLoc = SM.getPresumedLoc(Loc);
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if (PLoc.isInvalid())
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return;
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// Emit the other include frames first.
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emitIncludeStackRecursively(PLoc.getIncludeLoc(), SM);
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2011-12-17 13:26:04 +08:00
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// Emit the inclusion text/note.
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2012-05-10 13:03:45 +08:00
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emitIncludeLocation(Loc, PLoc, SM);
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2011-12-17 13:26:04 +08:00
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}
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/// \brief Recursively emit notes for each macro expansion and caret
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/// diagnostics where appropriate.
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///
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/// Walks up the macro expansion stack printing expansion notes, the code
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/// snippet, caret, underlines and FixItHint display as appropriate at each
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/// level.
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///
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/// \param Loc The location for this caret.
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/// \param Level The diagnostic level currently being emitted.
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/// \param Ranges The underlined ranges for this code snippet.
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/// \param Hints The FixIt hints active for this diagnostic.
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/// \param MacroSkipEnd The depth to stop skipping macro expansions.
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/// \param OnMacroInst The current depth of the macro expansion stack.
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void DiagnosticRenderer::emitMacroExpansionsAndCarets(
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SourceLocation Loc,
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DiagnosticsEngine::Level Level,
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SmallVectorImpl<CharSourceRange>& Ranges,
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ArrayRef<FixItHint> Hints,
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const SourceManager &SM,
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unsigned &MacroDepth,
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unsigned OnMacroInst)
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{
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assert(!Loc.isInvalid() && "must have a valid source location here");
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// If this is a file source location, directly emit the source snippet and
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// caret line. Also record the macro depth reached.
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if (Loc.isFileID()) {
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assert(MacroDepth == 0 && "We shouldn't hit a leaf node twice!");
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MacroDepth = OnMacroInst;
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2012-05-10 13:03:45 +08:00
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emitCodeContext(Loc, Level, Ranges, Hints, SM);
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return;
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}
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// Otherwise recurse through each macro expansion layer.
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// When processing macros, skip over the expansions leading up to
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// a macro argument, and trace the argument's expansion stack instead.
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2012-06-19 04:12:05 +08:00
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Loc = SM.skipToMacroArgExpansion(Loc);
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2011-12-17 13:26:04 +08:00
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2012-06-19 04:12:05 +08:00
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SourceLocation OneLevelUp = SM.getImmediateMacroCallerLoc(Loc);
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2011-12-17 13:26:04 +08:00
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// FIXME: Map ranges?
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2012-05-10 13:03:45 +08:00
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emitMacroExpansionsAndCarets(OneLevelUp, Level, Ranges, Hints, SM, MacroDepth,
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2011-12-17 13:26:04 +08:00
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OnMacroInst + 1);
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// Save the original location so we can find the spelling of the macro call.
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SourceLocation MacroLoc = Loc;
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// Map the location.
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2012-06-19 04:12:05 +08:00
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Loc = SM.getImmediateMacroCalleeLoc(Loc);
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2011-12-17 13:26:04 +08:00
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unsigned MacroSkipStart = 0, MacroSkipEnd = 0;
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2012-01-25 14:07:15 +08:00
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if (MacroDepth > DiagOpts.MacroBacktraceLimit &&
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DiagOpts.MacroBacktraceLimit != 0) {
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2011-12-17 13:26:04 +08:00
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MacroSkipStart = DiagOpts.MacroBacktraceLimit / 2 +
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DiagOpts.MacroBacktraceLimit % 2;
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MacroSkipEnd = MacroDepth - DiagOpts.MacroBacktraceLimit / 2;
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}
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// Whether to suppress printing this macro expansion.
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bool Suppressed = (OnMacroInst >= MacroSkipStart &&
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OnMacroInst < MacroSkipEnd);
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// Map the ranges.
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for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
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E = Ranges.end();
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I != E; ++I) {
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SourceLocation Start = I->getBegin(), End = I->getEnd();
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if (Start.isMacroID())
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I->setBegin(SM.getImmediateMacroCalleeLoc(Start));
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2011-12-17 13:26:04 +08:00
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if (End.isMacroID())
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2012-06-19 04:12:05 +08:00
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I->setEnd(SM.getImmediateMacroCalleeLoc(End));
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2011-12-17 13:26:04 +08:00
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}
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if (Suppressed) {
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// Tell the user that we've skipped contexts.
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if (OnMacroInst == MacroSkipStart) {
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2012-02-05 10:13:05 +08:00
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SmallString<200> MessageStorage;
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2011-12-17 13:26:04 +08:00
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llvm::raw_svector_ostream Message(MessageStorage);
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Message << "(skipping " << (MacroSkipEnd - MacroSkipStart)
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<< " expansions in backtrace; use -fmacro-backtrace-limit=0 to "
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"see all)";
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emitBasicNote(Message.str());
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}
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return;
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}
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2012-02-05 10:13:05 +08:00
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SmallString<100> MessageStorage;
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2011-12-17 13:26:04 +08:00
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llvm::raw_svector_ostream Message(MessageStorage);
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Message << "expanded from macro '"
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2012-01-24 00:58:33 +08:00
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<< getImmediateMacroName(MacroLoc, SM, LangOpts) << "'";
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2011-12-17 13:26:04 +08:00
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emitDiagnostic(SM.getSpellingLoc(Loc), DiagnosticsEngine::Note,
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Message.str(),
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2012-05-10 13:03:45 +08:00
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|
Ranges, ArrayRef<FixItHint>(), &SM);
|
2011-12-17 13:26:04 +08:00
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|
}
|
|
|
|
|
2012-02-14 10:46:00 +08:00
|
|
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DiagnosticNoteRenderer::~DiagnosticNoteRenderer() {}
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|
|
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|
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void DiagnosticNoteRenderer::emitIncludeLocation(SourceLocation Loc,
|
2012-05-10 13:03:45 +08:00
|
|
|
PresumedLoc PLoc,
|
|
|
|
const SourceManager &SM) {
|
2012-02-14 10:46:00 +08:00
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|
// Generate a note indicating the include location.
|
|
|
|
SmallString<200> MessageStorage;
|
|
|
|
llvm::raw_svector_ostream Message(MessageStorage);
|
|
|
|
Message << "in file included from " << PLoc.getFilename() << ':'
|
|
|
|
<< PLoc.getLine() << ":";
|
2012-05-10 13:03:45 +08:00
|
|
|
emitNote(Loc, Message.str(), &SM);
|
2012-02-14 10:46:00 +08:00
|
|
|
}
|
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|
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void DiagnosticNoteRenderer::emitBasicNote(StringRef Message) {
|
2012-05-10 13:03:45 +08:00
|
|
|
emitNote(SourceLocation(), Message, 0);
|
2012-02-14 10:46:00 +08:00
|
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|
}
|