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llvm-project/clang/lib/Frontend/DiagnosticRenderer.cpp

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//===--- DiagnosticRenderer.cpp - Diagnostic Pretty-Printing --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/DiagnosticRenderer.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Edit/Commit.h"
#include "clang/Edit/EditedSource.h"
#include "clang/Edit/EditsReceiver.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace clang;
/// \brief Retrieve the name of the immediate macro expansion.
///
/// This routine starts from a source location, and finds the name of the macro
/// responsible for its immediate expansion. It looks through any intervening
/// macro argument expansions to compute this. It returns a StringRef which
/// refers to the SourceManager-owned buffer of the source where that macro
/// name is spelled. Thus, the result shouldn't out-live that SourceManager.
///
/// This differs from Lexer::getImmediateMacroName in that any macro argument
/// location will result in the topmost function macro that accepted it.
/// e.g.
/// \code
/// MAC1( MAC2(foo) )
/// \endcode
/// for location of 'foo' token, this function will return "MAC1" while
/// Lexer::getImmediateMacroName will return "MAC2".
static StringRef getImmediateMacroName(SourceLocation Loc,
const SourceManager &SM,
const LangOptions &LangOpts) {
assert(Loc.isMacroID() && "Only reasonble to call this on macros");
// Walk past macro argument expanions.
while (SM.isMacroArgExpansion(Loc))
Loc = SM.getImmediateExpansionRange(Loc).first;
// If the macro's spelling has no FileID, then it's actually a token paste
// or stringization (or similar) and not a macro at all.
if (!SM.getFileEntryForID(SM.getFileID(SM.getSpellingLoc(Loc))))
return StringRef();
// Find the spelling location of the start of the non-argument expansion
// range. This is where the macro name was spelled in order to begin
// expanding this macro.
Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
// Dig out the buffer where the macro name was spelled and the extents of the
// name so that we can render it into the expansion note.
std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
}
DiagnosticRenderer::DiagnosticRenderer(const LangOptions &LangOpts,
DiagnosticOptions *DiagOpts)
: LangOpts(LangOpts), DiagOpts(DiagOpts), LastLevel() {}
DiagnosticRenderer::~DiagnosticRenderer() {}
namespace {
class FixitReceiver : public edit::EditsReceiver {
SmallVectorImpl<FixItHint> &MergedFixits;
public:
FixitReceiver(SmallVectorImpl<FixItHint> &MergedFixits)
: MergedFixits(MergedFixits) { }
void insert(SourceLocation loc, StringRef text) override {
MergedFixits.push_back(FixItHint::CreateInsertion(loc, text));
}
void replace(CharSourceRange range, StringRef text) override {
MergedFixits.push_back(FixItHint::CreateReplacement(range, text));
}
};
}
static void mergeFixits(ArrayRef<FixItHint> FixItHints,
const SourceManager &SM, const LangOptions &LangOpts,
SmallVectorImpl<FixItHint> &MergedFixits) {
edit::Commit commit(SM, LangOpts);
for (ArrayRef<FixItHint>::const_iterator
I = FixItHints.begin(), E = FixItHints.end(); I != E; ++I) {
const FixItHint &Hint = *I;
if (Hint.CodeToInsert.empty()) {
if (Hint.InsertFromRange.isValid())
commit.insertFromRange(Hint.RemoveRange.getBegin(),
Hint.InsertFromRange, /*afterToken=*/false,
Hint.BeforePreviousInsertions);
else
commit.remove(Hint.RemoveRange);
} else {
if (Hint.RemoveRange.isTokenRange() ||
Hint.RemoveRange.getBegin() != Hint.RemoveRange.getEnd())
commit.replace(Hint.RemoveRange, Hint.CodeToInsert);
else
commit.insert(Hint.RemoveRange.getBegin(), Hint.CodeToInsert,
/*afterToken=*/false, Hint.BeforePreviousInsertions);
}
}
edit::EditedSource Editor(SM, LangOpts);
if (Editor.commit(commit)) {
FixitReceiver Rec(MergedFixits);
Editor.applyRewrites(Rec);
}
}
void DiagnosticRenderer::emitDiagnostic(SourceLocation Loc,
DiagnosticsEngine::Level Level,
StringRef Message,
ArrayRef<CharSourceRange> Ranges,
ArrayRef<FixItHint> FixItHints,
const SourceManager *SM,
DiagOrStoredDiag D) {
assert(SM || Loc.isInvalid());
beginDiagnostic(D, Level);
if (!Loc.isValid())
// If we have no source location, just emit the diagnostic message.
emitDiagnosticMessage(Loc, PresumedLoc(), Level, Message, Ranges, SM, D);
else {
// Get the ranges into a local array we can hack on.
SmallVector<CharSourceRange, 20> MutableRanges(Ranges.begin(),
Ranges.end());
SmallVector<FixItHint, 8> MergedFixits;
if (!FixItHints.empty()) {
mergeFixits(FixItHints, *SM, LangOpts, MergedFixits);
FixItHints = MergedFixits;
}
for (ArrayRef<FixItHint>::const_iterator I = FixItHints.begin(),
E = FixItHints.end();
I != E; ++I)
if (I->RemoveRange.isValid())
MutableRanges.push_back(I->RemoveRange);
SourceLocation UnexpandedLoc = Loc;
// Find the ultimate expansion location for the diagnostic.
Loc = SM->getFileLoc(Loc);
PresumedLoc PLoc = SM->getPresumedLoc(Loc, DiagOpts->ShowPresumedLoc);
// First, if this diagnostic is not in the main file, print out the
// "included from" lines.
emitIncludeStack(Loc, PLoc, Level, *SM);
// Next, emit the actual diagnostic message and caret.
emitDiagnosticMessage(Loc, PLoc, Level, Message, Ranges, SM, D);
emitCaret(Loc, Level, MutableRanges, FixItHints, *SM);
// If this location is within a macro, walk from UnexpandedLoc up to Loc
// and produce a macro backtrace.
if (UnexpandedLoc.isValid() && UnexpandedLoc.isMacroID()) {
emitMacroExpansions(UnexpandedLoc, Level, MutableRanges, FixItHints, *SM);
}
}
LastLoc = Loc;
LastLevel = Level;
endDiagnostic(D, Level);
}
void DiagnosticRenderer::emitStoredDiagnostic(StoredDiagnostic &Diag) {
emitDiagnostic(Diag.getLocation(), Diag.getLevel(), Diag.getMessage(),
Diag.getRanges(), Diag.getFixIts(),
Diag.getLocation().isValid() ? &Diag.getLocation().getManager()
: nullptr,
&Diag);
}
void DiagnosticRenderer::emitBasicNote(StringRef Message) {
emitDiagnosticMessage(
SourceLocation(), PresumedLoc(), DiagnosticsEngine::Note, Message,
None, nullptr, DiagOrStoredDiag());
}
/// \brief Prints an include stack when appropriate for a particular
/// diagnostic level and location.
///
/// This routine handles all the logic of suppressing particular include
/// stacks (such as those for notes) and duplicate include stacks when
/// repeated warnings occur within the same file. It also handles the logic
/// of customizing the formatting and display of the include stack.
///
/// \param Loc The diagnostic location.
/// \param PLoc The presumed location of the diagnostic location.
/// \param Level The diagnostic level of the message this stack pertains to.
void DiagnosticRenderer::emitIncludeStack(SourceLocation Loc,
PresumedLoc PLoc,
DiagnosticsEngine::Level Level,
const SourceManager &SM) {
SourceLocation IncludeLoc = PLoc.getIncludeLoc();
// Skip redundant include stacks altogether.
if (LastIncludeLoc == IncludeLoc)
return;
LastIncludeLoc = IncludeLoc;
if (!DiagOpts->ShowNoteIncludeStack && Level == DiagnosticsEngine::Note)
return;
if (IncludeLoc.isValid())
emitIncludeStackRecursively(IncludeLoc, SM);
else {
emitModuleBuildStack(SM);
emitImportStack(Loc, SM);
}
}
/// \brief Helper to recursivly walk up the include stack and print each layer
/// on the way back down.
void DiagnosticRenderer::emitIncludeStackRecursively(SourceLocation Loc,
const SourceManager &SM) {
if (Loc.isInvalid()) {
emitModuleBuildStack(SM);
return;
}
PresumedLoc PLoc = SM.getPresumedLoc(Loc, DiagOpts->ShowPresumedLoc);
if (PLoc.isInvalid())
return;
// If this source location was imported from a module, print the module
// import stack rather than the
// FIXME: We want submodule granularity here.
std::pair<SourceLocation, StringRef> Imported = SM.getModuleImportLoc(Loc);
if (!Imported.second.empty()) {
// This location was imported by a module. Emit the module import stack.
emitImportStackRecursively(Imported.first, Imported.second, SM);
return;
}
// Emit the other include frames first.
emitIncludeStackRecursively(PLoc.getIncludeLoc(), SM);
// Emit the inclusion text/note.
emitIncludeLocation(Loc, PLoc, SM);
}
/// \brief Emit the module import stack associated with the current location.
void DiagnosticRenderer::emitImportStack(SourceLocation Loc,
const SourceManager &SM) {
if (Loc.isInvalid()) {
emitModuleBuildStack(SM);
return;
}
std::pair<SourceLocation, StringRef> NextImportLoc
= SM.getModuleImportLoc(Loc);
emitImportStackRecursively(NextImportLoc.first, NextImportLoc.second, SM);
}
/// \brief Helper to recursivly walk up the import stack and print each layer
/// on the way back down.
void DiagnosticRenderer::emitImportStackRecursively(SourceLocation Loc,
StringRef ModuleName,
const SourceManager &SM) {
if (ModuleName.empty()) {
return;
}
PresumedLoc PLoc = SM.getPresumedLoc(Loc, DiagOpts->ShowPresumedLoc);
// Emit the other import frames first.
std::pair<SourceLocation, StringRef> NextImportLoc
= SM.getModuleImportLoc(Loc);
emitImportStackRecursively(NextImportLoc.first, NextImportLoc.second, SM);
// Emit the inclusion text/note.
emitImportLocation(Loc, PLoc, ModuleName, SM);
}
/// \brief Emit the module build stack, for cases where a module is (re-)built
/// on demand.
void DiagnosticRenderer::emitModuleBuildStack(const SourceManager &SM) {
ModuleBuildStack Stack = SM.getModuleBuildStack();
for (unsigned I = 0, N = Stack.size(); I != N; ++I) {
const SourceManager &CurSM = Stack[I].second.getManager();
SourceLocation CurLoc = Stack[I].second;
emitBuildingModuleLocation(CurLoc,
CurSM.getPresumedLoc(CurLoc,
DiagOpts->ShowPresumedLoc),
Stack[I].first,
CurSM);
}
}
/// A recursive function to trace all possible backtrace locations
/// to match the \p CaretLocFileID.
static SourceLocation retrieveMacroLocation(SourceLocation Loc,
FileID MacroFileID,
FileID CaretFileID,
bool getBeginLoc,
const SourceManager *SM) {
if (MacroFileID == CaretFileID) return Loc;
if (!Loc.isMacroID()) return SourceLocation();
SourceLocation MacroLocation, MacroArgLocation;
if (SM->isMacroArgExpansion(Loc)) {
MacroLocation = SM->getImmediateSpellingLoc(Loc);
MacroArgLocation = getBeginLoc ? SM->getImmediateExpansionRange(Loc).first
: SM->getImmediateExpansionRange(Loc).second;
} else {
MacroLocation = getBeginLoc ? SM->getImmediateExpansionRange(Loc).first
: SM->getImmediateExpansionRange(Loc).second;
MacroArgLocation = SM->getImmediateSpellingLoc(Loc);
}
MacroFileID = SM->getFileID(MacroLocation);
MacroLocation = retrieveMacroLocation(MacroLocation, MacroFileID, CaretFileID,
getBeginLoc, SM);
if (MacroLocation.isValid()) return MacroLocation;
MacroFileID = SM->getFileID(MacroArgLocation);
return retrieveMacroLocation(MacroArgLocation, MacroFileID, CaretFileID,
getBeginLoc, SM);
}
// Helper function to fix up source ranges. It takes in an array of ranges,
// and outputs an array of ranges where we want to draw the range highlighting
// around the location specified by CaretLoc.
//
// To find locations which correspond to the caret, we crawl the macro caller
// chain for the beginning and end of each range. If the caret location
// is in a macro expansion, we search each chain for a location
// in the same expansion as the caret; otherwise, we crawl to the top of
// each chain. Two locations are part of the same macro expansion
// iff the FileID is the same.
static void mapDiagnosticRanges(
SourceLocation CaretLoc,
ArrayRef<CharSourceRange> Ranges,
SmallVectorImpl<CharSourceRange> &SpellingRanges,
const SourceManager *SM) {
FileID CaretLocFileID = SM->getFileID(CaretLoc);
for (auto I = Ranges.begin(), E = Ranges.end(); I != E; ++I) {
if (I->isInvalid()) continue;
SourceLocation Begin = I->getBegin(), End = I->getEnd();
bool IsTokenRange = I->isTokenRange();
FileID BeginFileID = SM->getFileID(Begin);
FileID EndFileID = SM->getFileID(End);
// Find the common parent for the beginning and end of the range.
// First, crawl the expansion chain for the beginning of the range.
llvm::SmallDenseMap<FileID, SourceLocation> BeginLocsMap;
while (Begin.isMacroID() && BeginFileID != EndFileID) {
BeginLocsMap[BeginFileID] = Begin;
Begin = SM->getImmediateExpansionRange(Begin).first;
BeginFileID = SM->getFileID(Begin);
}
// Then, crawl the expansion chain for the end of the range.
if (BeginFileID != EndFileID) {
while (End.isMacroID() && !BeginLocsMap.count(EndFileID)) {
End = SM->getImmediateExpansionRange(End).second;
EndFileID = SM->getFileID(End);
}
if (End.isMacroID()) {
Begin = BeginLocsMap[EndFileID];
BeginFileID = EndFileID;
}
}
// Do the backtracking.
Begin = retrieveMacroLocation(Begin, BeginFileID, CaretLocFileID,
true /*getBeginLoc*/, SM);
End = retrieveMacroLocation(End, BeginFileID, CaretLocFileID,
false /*getBeginLoc*/, SM);
if (Begin.isInvalid() || End.isInvalid()) continue;
// Return the spelling location of the beginning and end of the range.
Begin = SM->getSpellingLoc(Begin);
End = SM->getSpellingLoc(End);
SpellingRanges.push_back(CharSourceRange(SourceRange(Begin, End),
IsTokenRange));
}
}
void DiagnosticRenderer::emitCaret(SourceLocation Loc,
DiagnosticsEngine::Level Level,
ArrayRef<CharSourceRange> Ranges,
ArrayRef<FixItHint> Hints,
const SourceManager &SM) {
SmallVector<CharSourceRange, 4> SpellingRanges;
mapDiagnosticRanges(Loc, Ranges, SpellingRanges, &SM);
emitCodeContext(Loc, Level, SpellingRanges, Hints, SM);
}
/// \brief A helper function for emitMacroExpansion to print the
/// macro expansion message
void DiagnosticRenderer::emitSingleMacroExpansion(
SourceLocation Loc,
DiagnosticsEngine::Level Level,
ArrayRef<CharSourceRange> Ranges,
const SourceManager &SM) {
// Find the spelling location for the macro definition. We must use the
// spelling location here to avoid emitting a macro backtrace for the note.
SourceLocation SpellingLoc = SM.getSpellingLoc(Loc);
// Map the ranges into the FileID of the diagnostic location.
SmallVector<CharSourceRange, 4> SpellingRanges;
mapDiagnosticRanges(Loc, Ranges, SpellingRanges, &SM);
SmallString<100> MessageStorage;
llvm::raw_svector_ostream Message(MessageStorage);
StringRef MacroName = getImmediateMacroName(Loc, SM, LangOpts);
if (MacroName.empty())
Message << "expanded from here";
else
Message << "expanded from macro '" << MacroName << "'";
emitDiagnostic(SpellingLoc, DiagnosticsEngine::Note, Message.str(),
SpellingRanges, None, &SM);
}
/// Check that the macro argument location of Loc starts with ArgumentLoc.
/// The starting location of the macro expansions is used to differeniate
/// different macro expansions.
static bool checkLocForMacroArgExpansion(SourceLocation Loc,
const SourceManager &SM,
SourceLocation ArgumentLoc) {
SourceLocation MacroLoc;
if (SM.isMacroArgExpansion(Loc, &MacroLoc)) {
if (ArgumentLoc == MacroLoc) return true;
}
return false;
}
/// Check if all the locations in the range have the same macro argument
/// expansion, and that that expansion starts with ArgumentLoc.
static bool checkRangeForMacroArgExpansion(CharSourceRange Range,
const SourceManager &SM,
SourceLocation ArgumentLoc) {
SourceLocation BegLoc = Range.getBegin(), EndLoc = Range.getEnd();
while (BegLoc != EndLoc) {
if (!checkLocForMacroArgExpansion(BegLoc, SM, ArgumentLoc))
return false;
BegLoc.getLocWithOffset(1);
}
return checkLocForMacroArgExpansion(BegLoc, SM, ArgumentLoc);
}
/// A helper function to check if the current ranges are all inside the same
/// macro argument expansion as Loc.
static bool checkRangesForMacroArgExpansion(SourceLocation Loc,
ArrayRef<CharSourceRange> Ranges,
const SourceManager &SM) {
assert(Loc.isMacroID() && "Must be a macro expansion!");
SmallVector<CharSourceRange, 4> SpellingRanges;
mapDiagnosticRanges(Loc, Ranges, SpellingRanges, &SM);
/// Count all valid ranges.
unsigned ValidCount = 0;
for (auto I : Ranges)
if (I.isValid()) ValidCount++;
if (ValidCount > SpellingRanges.size())
return false;
/// To store the source location of the argument location.
SourceLocation ArgumentLoc;
/// Set the ArgumentLoc to the beginning location of the expansion of Loc
/// so to check if the ranges expands to the same beginning location.
if (!SM.isMacroArgExpansion(Loc,&ArgumentLoc))
return false;
for (auto I = SpellingRanges.begin(), E = SpellingRanges.end(); I != E; ++I) {
if (!checkRangeForMacroArgExpansion(*I, SM, ArgumentLoc))
return false;
}
return true;
}
/// \brief Recursively emit notes for each macro expansion and caret
/// diagnostics where appropriate.
///
/// Walks up the macro expansion stack printing expansion notes, the code
/// snippet, caret, underlines and FixItHint display as appropriate at each
/// level.
///
/// \param Loc The location for this caret.
/// \param Level The diagnostic level currently being emitted.
/// \param Ranges The underlined ranges for this code snippet.
/// \param Hints The FixIt hints active for this diagnostic.
void DiagnosticRenderer::emitMacroExpansions(SourceLocation Loc,
DiagnosticsEngine::Level Level,
ArrayRef<CharSourceRange> Ranges,
ArrayRef<FixItHint> Hints,
const SourceManager &SM) {
assert(Loc.isValid() && "must have a valid source location here");
// Produce a stack of macro backtraces.
SmallVector<SourceLocation, 8> LocationStack;
unsigned IgnoredEnd = 0;
while (Loc.isMacroID()) {
// If this is the expansion of a macro argument, point the caret at the
// use of the argument in the definition of the macro, not the expansion.
if (SM.isMacroArgExpansion(Loc))
LocationStack.push_back(SM.getImmediateExpansionRange(Loc).first);
else
LocationStack.push_back(Loc);
if (checkRangesForMacroArgExpansion(Loc, Ranges, SM))
IgnoredEnd = LocationStack.size();
Loc = SM.getImmediateMacroCallerLoc(Loc);
// Once the location no longer points into a macro, try stepping through
// the last found location. This sometimes produces additional useful
// backtraces.
if (Loc.isFileID())
Loc = SM.getImmediateMacroCallerLoc(LocationStack.back());
assert(Loc.isValid() && "must have a valid source location here");
}
LocationStack.erase(LocationStack.begin(),
LocationStack.begin() + IgnoredEnd);
unsigned MacroDepth = LocationStack.size();
unsigned MacroLimit = DiagOpts->MacroBacktraceLimit;
if (MacroDepth <= MacroLimit || MacroLimit == 0) {
for (auto I = LocationStack.rbegin(), E = LocationStack.rend();
I != E; ++I)
emitSingleMacroExpansion(*I, Level, Ranges, SM);
return;
}
unsigned MacroStartMessages = MacroLimit / 2;
unsigned MacroEndMessages = MacroLimit / 2 + MacroLimit % 2;
for (auto I = LocationStack.rbegin(),
E = LocationStack.rbegin() + MacroStartMessages;
I != E; ++I)
emitSingleMacroExpansion(*I, Level, Ranges, SM);
SmallString<200> MessageStorage;
llvm::raw_svector_ostream Message(MessageStorage);
Message << "(skipping " << (MacroDepth - MacroLimit)
<< " expansions in backtrace; use -fmacro-backtrace-limit=0 to "
"see all)";
emitBasicNote(Message.str());
for (auto I = LocationStack.rend() - MacroEndMessages,
E = LocationStack.rend();
I != E; ++I)
emitSingleMacroExpansion(*I, Level, Ranges, SM);
}
DiagnosticNoteRenderer::~DiagnosticNoteRenderer() {}
void DiagnosticNoteRenderer::emitIncludeLocation(SourceLocation Loc,
PresumedLoc PLoc,
const SourceManager &SM) {
// 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() << ":";
emitNote(Loc, Message.str(), &SM);
}
void DiagnosticNoteRenderer::emitImportLocation(SourceLocation Loc,
PresumedLoc PLoc,
StringRef ModuleName,
const SourceManager &SM) {
// Generate a note indicating the include location.
SmallString<200> MessageStorage;
llvm::raw_svector_ostream Message(MessageStorage);
Message << "in module '" << ModuleName;
if (PLoc.isValid())
Message << "' imported from " << PLoc.getFilename() << ':'
<< PLoc.getLine();
Message << ":";
emitNote(Loc, Message.str(), &SM);
}
void
DiagnosticNoteRenderer::emitBuildingModuleLocation(SourceLocation Loc,
PresumedLoc PLoc,
StringRef ModuleName,
const SourceManager &SM) {
// Generate a note indicating the include location.
SmallString<200> MessageStorage;
llvm::raw_svector_ostream Message(MessageStorage);
if (PLoc.getFilename())
Message << "while building module '" << ModuleName << "' imported from "
<< PLoc.getFilename() << ':' << PLoc.getLine() << ":";
else
Message << "while building module '" << ModuleName << "':";
emitNote(Loc, Message.str(), &SM);
}
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