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llvm-project/clang/tools/clang-refactor/TestSupport.cpp

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//===--- TestSupport.cpp - Clang-based refactoring tool -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements routines that provide refactoring testing
/// utilities.
///
//===----------------------------------------------------------------------===//
#include "TestSupport.h"
#include "clang/Basic/DiagnosticError.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/LineIterator.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace clang {
namespace refactor {
void TestSelectionRangesInFile::dump(raw_ostream &OS) const {
for (const auto &Group : GroupedRanges) {
OS << "Test selection group '" << Group.Name << "':\n";
for (const auto &Range : Group.Ranges) {
OS << " " << Range.Begin << "-" << Range.End << "\n";
}
}
}
bool TestSelectionRangesInFile::foreachRange(
const SourceManager &SM,
llvm::function_ref<void(SourceRange)> Callback) const {
auto FE = SM.getFileManager().getFile(Filename);
FileID FID = FE ? SM.translateFile(*FE) : FileID();
if (!FE || FID.isInvalid()) {
llvm::errs() << "error: -selection=test:" << Filename
<< " : given file is not in the target TU";
return true;
}
SourceLocation FileLoc = SM.getLocForStartOfFile(FID);
for (const auto &Group : GroupedRanges) {
for (const TestSelectionRange &Range : Group.Ranges) {
// Translate the offset pair to a true source range.
SourceLocation Start =
SM.getMacroArgExpandedLocation(FileLoc.getLocWithOffset(Range.Begin));
SourceLocation End =
SM.getMacroArgExpandedLocation(FileLoc.getLocWithOffset(Range.End));
assert(Start.isValid() && End.isValid() && "unexpected invalid range");
Callback(SourceRange(Start, End));
}
}
return false;
}
namespace {
void dumpChanges(const tooling::AtomicChanges &Changes, raw_ostream &OS) {
for (const auto &Change : Changes)
OS << const_cast<tooling::AtomicChange &>(Change).toYAMLString() << "\n";
}
bool areChangesSame(const tooling::AtomicChanges &LHS,
const tooling::AtomicChanges &RHS) {
if (LHS.size() != RHS.size())
return false;
for (auto I : llvm::zip(LHS, RHS)) {
if (!(std::get<0>(I) == std::get<1>(I)))
return false;
}
return true;
}
bool printRewrittenSources(const tooling::AtomicChanges &Changes,
raw_ostream &OS) {
std::set<std::string> Files;
for (const auto &Change : Changes)
Files.insert(Change.getFilePath());
tooling::ApplyChangesSpec Spec;
Spec.Cleanup = false;
for (const auto &File : Files) {
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> BufferErr =
llvm::MemoryBuffer::getFile(File);
if (!BufferErr) {
llvm::errs() << "failed to open" << File << "\n";
return true;
}
auto Result = tooling::applyAtomicChanges(File, (*BufferErr)->getBuffer(),
Changes, Spec);
if (!Result) {
llvm::errs() << toString(Result.takeError());
return true;
}
OS << *Result;
}
return false;
}
class TestRefactoringResultConsumer final
: public ClangRefactorToolConsumerInterface {
public:
TestRefactoringResultConsumer(const TestSelectionRangesInFile &TestRanges)
: TestRanges(TestRanges) {
Results.push_back({});
}
~TestRefactoringResultConsumer() {
// Ensure all results are checked.
for (auto &Group : Results) {
for (auto &Result : Group) {
if (!Result) {
(void)llvm::toString(Result.takeError());
}
}
}
}
void handleError(llvm::Error Err) override { handleResult(std::move(Err)); }
void handle(tooling::AtomicChanges Changes) override {
handleResult(std::move(Changes));
}
void handle(tooling::SymbolOccurrences Occurrences) override {
tooling::RefactoringResultConsumer::handle(std::move(Occurrences));
}
private:
bool handleAllResults();
void handleResult(Expected<tooling::AtomicChanges> Result) {
Results.back().push_back(std::move(Result));
size_t GroupIndex = Results.size() - 1;
if (Results.back().size() >=
TestRanges.GroupedRanges[GroupIndex].Ranges.size()) {
++GroupIndex;
if (GroupIndex >= TestRanges.GroupedRanges.size()) {
if (handleAllResults())
exit(1); // error has occurred.
return;
}
Results.push_back({});
}
}
const TestSelectionRangesInFile &TestRanges;
std::vector<std::vector<Expected<tooling::AtomicChanges>>> Results;
};
std::pair<unsigned, unsigned> getLineColumn(StringRef Filename,
unsigned Offset) {
ErrorOr<std::unique_ptr<MemoryBuffer>> ErrOrFile =
MemoryBuffer::getFile(Filename);
if (!ErrOrFile)
return {0, 0};
StringRef Source = ErrOrFile.get()->getBuffer();
Source = Source.take_front(Offset);
size_t LastLine = Source.find_last_of("\r\n");
return {Source.count('\n') + 1,
(LastLine == StringRef::npos ? Offset : Offset - LastLine) + 1};
}
} // end anonymous namespace
bool TestRefactoringResultConsumer::handleAllResults() {
bool Failed = false;
for (auto &Group : llvm::enumerate(Results)) {
// All ranges in the group must produce the same result.
Optional<tooling::AtomicChanges> CanonicalResult;
Optional<std::string> CanonicalErrorMessage;
for (auto &I : llvm::enumerate(Group.value())) {
Expected<tooling::AtomicChanges> &Result = I.value();
std::string ErrorMessage;
bool HasResult = !!Result;
if (!HasResult) {
handleAllErrors(
Result.takeError(),
[&](StringError &Err) { ErrorMessage = Err.getMessage(); },
[&](DiagnosticError &Err) {
const PartialDiagnosticAt &Diag = Err.getDiagnostic();
llvm::SmallString<100> DiagText;
Diag.second.EmitToString(getDiags(), DiagText);
ErrorMessage = std::string(DiagText);
});
}
if (!CanonicalResult && !CanonicalErrorMessage) {
if (HasResult)
CanonicalResult = std::move(*Result);
else
CanonicalErrorMessage = std::move(ErrorMessage);
continue;
}
// Verify that this result corresponds to the canonical result.
if (CanonicalErrorMessage) {
// The error messages must match.
if (!HasResult && ErrorMessage == *CanonicalErrorMessage)
continue;
} else {
assert(CanonicalResult && "missing canonical result");
// The results must match.
if (HasResult && areChangesSame(*Result, *CanonicalResult))
continue;
}
Failed = true;
// Report the mismatch.
std::pair<unsigned, unsigned> LineColumn = getLineColumn(
TestRanges.Filename,
TestRanges.GroupedRanges[Group.index()].Ranges[I.index()].Begin);
llvm::errs()
<< "error: unexpected refactoring result for range starting at "
<< LineColumn.first << ':' << LineColumn.second << " in group '"
<< TestRanges.GroupedRanges[Group.index()].Name << "':\n ";
if (HasResult)
llvm::errs() << "valid result";
else
llvm::errs() << "error '" << ErrorMessage << "'";
llvm::errs() << " does not match initial ";
if (CanonicalErrorMessage)
llvm::errs() << "error '" << *CanonicalErrorMessage << "'\n";
else
llvm::errs() << "valid result\n";
if (HasResult && !CanonicalErrorMessage) {
llvm::errs() << " Expected to Produce:\n";
dumpChanges(*CanonicalResult, llvm::errs());
llvm::errs() << " Produced:\n";
dumpChanges(*Result, llvm::errs());
}
}
// Dump the results:
const auto &TestGroup = TestRanges.GroupedRanges[Group.index()];
if (!CanonicalResult) {
llvm::outs() << TestGroup.Ranges.size() << " '" << TestGroup.Name
<< "' results:\n";
llvm::outs() << *CanonicalErrorMessage << "\n";
} else {
llvm::outs() << TestGroup.Ranges.size() << " '" << TestGroup.Name
<< "' results:\n";
if (printRewrittenSources(*CanonicalResult, llvm::outs()))
return true;
}
}
return Failed;
}
std::unique_ptr<ClangRefactorToolConsumerInterface>
TestSelectionRangesInFile::createConsumer() const {
return std::make_unique<TestRefactoringResultConsumer>(*this);
}
/// Adds the \p ColumnOffset to file offset \p Offset, without going past a
/// newline.
static unsigned addColumnOffset(StringRef Source, unsigned Offset,
unsigned ColumnOffset) {
if (!ColumnOffset)
return Offset;
StringRef Substr = Source.drop_front(Offset).take_front(ColumnOffset);
size_t NewlinePos = Substr.find_first_of("\r\n");
return Offset +
(NewlinePos == StringRef::npos ? ColumnOffset : (unsigned)NewlinePos);
}
static unsigned addEndLineOffsetAndEndColumn(StringRef Source, unsigned Offset,
unsigned LineNumberOffset,
unsigned Column) {
StringRef Line = Source.drop_front(Offset);
unsigned LineOffset = 0;
for (; LineNumberOffset != 0; --LineNumberOffset) {
size_t NewlinePos = Line.find_first_of("\r\n");
// Line offset goes out of bounds.
if (NewlinePos == StringRef::npos)
break;
LineOffset += NewlinePos + 1;
Line = Line.drop_front(NewlinePos + 1);
}
// Source now points to the line at +lineOffset;
size_t LineStart = Source.find_last_of("\r\n", /*From=*/Offset + LineOffset);
return addColumnOffset(
Source, LineStart == StringRef::npos ? 0 : LineStart + 1, Column - 1);
}
Optional<TestSelectionRangesInFile>
findTestSelectionRanges(StringRef Filename) {
ErrorOr<std::unique_ptr<MemoryBuffer>> ErrOrFile =
MemoryBuffer::getFile(Filename);
if (!ErrOrFile) {
llvm::errs() << "error: -selection=test:" << Filename
<< " : could not open the given file";
return None;
}
StringRef Source = ErrOrFile.get()->getBuffer();
// See the doc comment for this function for the explanation of this
// syntax.
static const Regex RangeRegex(
"range[[:blank:]]*([[:alpha:]_]*)?[[:blank:]]*=[[:"
"blank:]]*(\\+[[:digit:]]+)?[[:blank:]]*(->[[:blank:]"
"]*[\\+\\:[:digit:]]+)?");
std::map<std::string, SmallVector<TestSelectionRange, 8>> GroupedRanges;
LangOptions LangOpts;
LangOpts.CPlusPlus = 1;
LangOpts.CPlusPlus11 = 1;
Lexer Lex(SourceLocation::getFromRawEncoding(0), LangOpts, Source.begin(),
Source.begin(), Source.end());
Lex.SetCommentRetentionState(true);
Token Tok;
for (Lex.LexFromRawLexer(Tok); Tok.isNot(tok::eof);
Lex.LexFromRawLexer(Tok)) {
if (Tok.isNot(tok::comment))
continue;
StringRef Comment =
Source.substr(Tok.getLocation().getRawEncoding(), Tok.getLength());
SmallVector<StringRef, 4> Matches;
// Try to detect mistyped 'range:' comments to ensure tests don't miss
// anything.
auto DetectMistypedCommand = [&]() -> bool {
if (Comment.contains_lower("range") && Comment.contains("=") &&
!Comment.contains_lower("run") && !Comment.contains("CHECK")) {
llvm::errs() << "error: suspicious comment '" << Comment
<< "' that "
"resembles the range command found\n";
llvm::errs() << "note: please reword if this isn't a range command\n";
}
return false;
};
// Allow CHECK: comments to contain range= commands.
if (!RangeRegex.match(Comment, &Matches) || Comment.contains("CHECK")) {
if (DetectMistypedCommand())
return None;
continue;
}
unsigned Offset = Tok.getEndLoc().getRawEncoding();
unsigned ColumnOffset = 0;
if (!Matches[2].empty()) {
// Don't forget to drop the '+'!
if (Matches[2].drop_front().getAsInteger(10, ColumnOffset))
assert(false && "regex should have produced a number");
}
Offset = addColumnOffset(Source, Offset, ColumnOffset);
unsigned EndOffset;
if (!Matches[3].empty()) {
static const Regex EndLocRegex(
"->[[:blank:]]*(\\+[[:digit:]]+):([[:digit:]]+)");
SmallVector<StringRef, 4> EndLocMatches;
if (!EndLocRegex.match(Matches[3], &EndLocMatches)) {
if (DetectMistypedCommand())
return None;
continue;
}
unsigned EndLineOffset = 0, EndColumn = 0;
if (EndLocMatches[1].drop_front().getAsInteger(10, EndLineOffset) ||
EndLocMatches[2].getAsInteger(10, EndColumn))
assert(false && "regex should have produced a number");
EndOffset = addEndLineOffsetAndEndColumn(Source, Offset, EndLineOffset,
EndColumn);
} else {
EndOffset = Offset;
}
TestSelectionRange Range = {Offset, EndOffset};
auto It = GroupedRanges.insert(std::make_pair(
Matches[1].str(), SmallVector<TestSelectionRange, 8>{Range}));
if (!It.second)
It.first->second.push_back(Range);
}
if (GroupedRanges.empty()) {
llvm::errs() << "error: -selection=test:" << Filename
<< ": no 'range' commands";
return None;
}
TestSelectionRangesInFile TestRanges = {Filename.str(), {}};
for (auto &Group : GroupedRanges)
TestRanges.GroupedRanges.push_back({Group.first, std::move(Group.second)});
return std::move(TestRanges);
}
} // end namespace refactor
} // end namespace clang
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