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llvm-project/clang/lib/Frontend/DiagnosticRenderer.cpp
Richard Trieu 3a5c958182 Fix -Wnull-conversion for long macros. 
Move the function to get a macro name from DiagnosticRenderer.cpp to Lexer.cpp
so that other files can use it.  Lexer now has two functions to get the
immediate macro name, the newly added one is better for diagnostic purposes.
Make -Wnull-conversion use this function for better NULL macro detection.

llvm-svn: 258778
2016-01-26 02:51:55 +00:00

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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;
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,
const SmallVectorImpl<FileID> &CommonArgExpansions,
bool IsBegin, const SourceManager *SM) {
assert(SM->getFileID(Loc) == MacroFileID);
if (MacroFileID == CaretFileID)
return Loc;
if (!Loc.isMacroID())
return SourceLocation();
SourceLocation MacroLocation, MacroArgLocation;
if (SM->isMacroArgExpansion(Loc)) {
// Only look at the immediate spelling location of this macro argument if
// the other location in the source range is also present in that expansion.
if (std::binary_search(CommonArgExpansions.begin(),
CommonArgExpansions.end(), MacroFileID))
MacroLocation = SM->getImmediateSpellingLoc(Loc);
MacroArgLocation = IsBegin ? SM->getImmediateExpansionRange(Loc).first
: SM->getImmediateExpansionRange(Loc).second;
} else {
MacroLocation = IsBegin ? SM->getImmediateExpansionRange(Loc).first
: SM->getImmediateExpansionRange(Loc).second;
MacroArgLocation = SM->getImmediateSpellingLoc(Loc);
}
if (MacroLocation.isValid()) {
MacroFileID = SM->getFileID(MacroLocation);
MacroLocation =
retrieveMacroLocation(MacroLocation, MacroFileID, CaretFileID,
CommonArgExpansions, IsBegin, SM);
if (MacroLocation.isValid())
return MacroLocation;
}
MacroFileID = SM->getFileID(MacroArgLocation);
return retrieveMacroLocation(MacroArgLocation, MacroFileID, CaretFileID,
CommonArgExpansions, IsBegin, SM);
}
/// Walk up the chain of macro expansions and collect the FileIDs identifying the
/// expansions.
static void getMacroArgExpansionFileIDs(SourceLocation Loc,
SmallVectorImpl<FileID> &IDs,
bool IsBegin, const SourceManager *SM) {
while (Loc.isMacroID()) {
if (SM->isMacroArgExpansion(Loc)) {
IDs.push_back(SM->getFileID(Loc));
Loc = SM->getImmediateSpellingLoc(Loc);
} else {
auto ExpRange = SM->getImmediateExpansionRange(Loc);
Loc = IsBegin ? ExpRange.first : ExpRange.second;
}
}
}
/// Collect the expansions of the begin and end locations and compute the set
/// intersection. Produces a sorted vector of FileIDs in CommonArgExpansions.
static void computeCommonMacroArgExpansionFileIDs(
SourceLocation Begin, SourceLocation End, const SourceManager *SM,
SmallVectorImpl<FileID> &CommonArgExpansions) {
SmallVector<FileID, 4> BeginArgExpansions;
SmallVector<FileID, 4> EndArgExpansions;
getMacroArgExpansionFileIDs(Begin, BeginArgExpansions, /*IsBegin=*/true, SM);
getMacroArgExpansionFileIDs(End, EndArgExpansions, /*IsBegin=*/false, SM);
std::sort(BeginArgExpansions.begin(), BeginArgExpansions.end());
std::sort(EndArgExpansions.begin(), EndArgExpansions.end());
std::set_intersection(BeginArgExpansions.begin(), BeginArgExpansions.end(),
EndArgExpansions.begin(), EndArgExpansions.end(),
std::back_inserter(CommonArgExpansions));
}
// 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.
SmallVector<FileID, 4> CommonArgExpansions;
computeCommonMacroArgExpansionFileIDs(Begin, End, SM, CommonArgExpansions);
Begin = retrieveMacroLocation(Begin, BeginFileID, CaretLocFileID,
CommonArgExpansions, /*IsBegin=*/true, SM);
End = retrieveMacroLocation(End, BeginFileID, CaretLocFileID,
CommonArgExpansions, /*IsBegin=*/false, 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 =
Lexer::getImmediateMacroNameForDiagnostics(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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