llvm-project/clang/lib/ARCMigrate/TransformActions.cpp

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//===--- ARCMT.cpp - Migration to ARC mode --------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "Internals.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Expr.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/DenseSet.h"
#include <map>
using namespace clang;
using namespace arcmt;
namespace {
/// Collects transformations and merges them before applying them with
/// with applyRewrites(). E.g. if the same source range
/// is requested to be removed twice, only one rewriter remove will be invoked.
/// Rewrites happen in "transactions"; if one rewrite in the transaction cannot
/// be done (e.g. it resides in a macro) all rewrites in the transaction are
/// aborted.
/// FIXME: "Transactional" rewrites support should be baked in the Rewriter.
class TransformActionsImpl {
CapturedDiagList &CapturedDiags;
ASTContext &Ctx;
Preprocessor &PP;
bool IsInTransaction;
enum ActionKind {
Act_Insert, Act_InsertAfterToken,
Act_Remove, Act_RemoveStmt,
Act_Replace, Act_ReplaceText,
Act_IncreaseIndentation,
Act_ClearDiagnostic
};
struct ActionData {
ActionKind Kind;
SourceLocation Loc;
SourceRange R1, R2;
StringRef Text1, Text2;
Stmt *S;
SmallVector<unsigned, 2> DiagIDs;
};
std::vector<ActionData> CachedActions;
enum RangeComparison {
Range_Before,
Range_After,
Range_Contains,
Range_Contained,
Range_ExtendsBegin,
Range_ExtendsEnd
};
/// A range to remove. It is a character range.
struct CharRange {
FullSourceLoc Begin, End;
CharRange(CharSourceRange range, SourceManager &srcMgr, Preprocessor &PP) {
SourceLocation beginLoc = range.getBegin(), endLoc = range.getEnd();
assert(beginLoc.isValid() && endLoc.isValid());
if (range.isTokenRange()) {
Begin = FullSourceLoc(srcMgr.getExpansionLoc(beginLoc), srcMgr);
End = FullSourceLoc(getLocForEndOfToken(endLoc, srcMgr, PP), srcMgr);
} else {
Begin = FullSourceLoc(srcMgr.getExpansionLoc(beginLoc), srcMgr);
End = FullSourceLoc(srcMgr.getExpansionLoc(endLoc), srcMgr);
}
assert(Begin.isValid() && End.isValid());
}
RangeComparison compareWith(const CharRange &RHS) const {
if (End.isBeforeInTranslationUnitThan(RHS.Begin))
return Range_Before;
if (RHS.End.isBeforeInTranslationUnitThan(Begin))
return Range_After;
if (!Begin.isBeforeInTranslationUnitThan(RHS.Begin) &&
!RHS.End.isBeforeInTranslationUnitThan(End))
return Range_Contained;
if (Begin.isBeforeInTranslationUnitThan(RHS.Begin) &&
RHS.End.isBeforeInTranslationUnitThan(End))
return Range_Contains;
if (Begin.isBeforeInTranslationUnitThan(RHS.Begin))
return Range_ExtendsBegin;
else
return Range_ExtendsEnd;
}
static RangeComparison compare(SourceRange LHS, SourceRange RHS,
SourceManager &SrcMgr, Preprocessor &PP) {
return CharRange(CharSourceRange::getTokenRange(LHS), SrcMgr, PP)
.compareWith(CharRange(CharSourceRange::getTokenRange(RHS),
SrcMgr, PP));
}
};
typedef SmallVector<StringRef, 2> TextsVec;
typedef std::map<FullSourceLoc, TextsVec, FullSourceLoc::BeforeThanCompare>
InsertsMap;
InsertsMap Inserts;
/// A list of ranges to remove. They are always sorted and they never
/// intersect with each other.
std::list<CharRange> Removals;
llvm::DenseSet<Stmt *> StmtRemovals;
std::vector<std::pair<CharRange, SourceLocation> > IndentationRanges;
/// Keeps text passed to transformation methods.
llvm::StringMap<bool> UniqueText;
public:
TransformActionsImpl(CapturedDiagList &capturedDiags,
ASTContext &ctx, Preprocessor &PP)
: CapturedDiags(capturedDiags), Ctx(ctx), PP(PP), IsInTransaction(false) { }
ASTContext &getASTContext() { return Ctx; }
void startTransaction();
bool commitTransaction();
void abortTransaction();
bool isInTransaction() const { return IsInTransaction; }
void insert(SourceLocation loc, StringRef text);
void insertAfterToken(SourceLocation loc, StringRef text);
void remove(SourceRange range);
void removeStmt(Stmt *S);
void replace(SourceRange range, StringRef text);
void replace(SourceRange range, SourceRange replacementRange);
void replaceStmt(Stmt *S, StringRef text);
void replaceText(SourceLocation loc, StringRef text,
StringRef replacementText);
void increaseIndentation(SourceRange range,
SourceLocation parentIndent);
bool clearDiagnostic(ArrayRef<unsigned> IDs, SourceRange range);
void applyRewrites(TransformActions::RewriteReceiver &receiver);
private:
bool canInsert(SourceLocation loc);
bool canInsertAfterToken(SourceLocation loc);
bool canRemoveRange(SourceRange range);
bool canReplaceRange(SourceRange range, SourceRange replacementRange);
bool canReplaceText(SourceLocation loc, StringRef text);
void commitInsert(SourceLocation loc, StringRef text);
void commitInsertAfterToken(SourceLocation loc, StringRef text);
void commitRemove(SourceRange range);
void commitRemoveStmt(Stmt *S);
void commitReplace(SourceRange range, SourceRange replacementRange);
void commitReplaceText(SourceLocation loc, StringRef text,
StringRef replacementText);
void commitIncreaseIndentation(SourceRange range,SourceLocation parentIndent);
void commitClearDiagnostic(ArrayRef<unsigned> IDs, SourceRange range);
void addRemoval(CharSourceRange range);
void addInsertion(SourceLocation loc, StringRef text);
/// Stores text passed to the transformation methods to keep the string
/// "alive". Since the vast majority of text will be the same, we also unique
/// the strings using a StringMap.
StringRef getUniqueText(StringRef text);
/// Computes the source location just past the end of the token at
/// the given source location. If the location points at a macro, the whole
/// macro expansion is skipped.
static SourceLocation getLocForEndOfToken(SourceLocation loc,
SourceManager &SM,Preprocessor &PP);
};
} // anonymous namespace
void TransformActionsImpl::startTransaction() {
assert(!IsInTransaction &&
"Cannot start a transaction in the middle of another one");
IsInTransaction = true;
}
bool TransformActionsImpl::commitTransaction() {
assert(IsInTransaction && "No transaction started");
if (CachedActions.empty()) {
IsInTransaction = false;
return false;
}
// Verify that all actions are possible otherwise abort the whole transaction.
bool AllActionsPossible = true;
for (unsigned i = 0, e = CachedActions.size(); i != e; ++i) {
ActionData &act = CachedActions[i];
switch (act.Kind) {
case Act_Insert:
if (!canInsert(act.Loc))
AllActionsPossible = false;
break;
case Act_InsertAfterToken:
if (!canInsertAfterToken(act.Loc))
AllActionsPossible = false;
break;
case Act_Remove:
if (!canRemoveRange(act.R1))
AllActionsPossible = false;
break;
case Act_RemoveStmt:
assert(act.S);
if (!canRemoveRange(act.S->getSourceRange()))
AllActionsPossible = false;
break;
case Act_Replace:
if (!canReplaceRange(act.R1, act.R2))
AllActionsPossible = false;
break;
case Act_ReplaceText:
if (!canReplaceText(act.Loc, act.Text1))
AllActionsPossible = false;
break;
case Act_IncreaseIndentation:
// This is not important, we don't care if it will fail.
break;
case Act_ClearDiagnostic:
// We are just checking source rewrites.
break;
}
if (!AllActionsPossible)
break;
}
if (!AllActionsPossible) {
abortTransaction();
return true;
}
for (unsigned i = 0, e = CachedActions.size(); i != e; ++i) {
ActionData &act = CachedActions[i];
switch (act.Kind) {
case Act_Insert:
commitInsert(act.Loc, act.Text1);
break;
case Act_InsertAfterToken:
commitInsertAfterToken(act.Loc, act.Text1);
break;
case Act_Remove:
commitRemove(act.R1);
break;
case Act_RemoveStmt:
commitRemoveStmt(act.S);
break;
case Act_Replace:
commitReplace(act.R1, act.R2);
break;
case Act_ReplaceText:
commitReplaceText(act.Loc, act.Text1, act.Text2);
break;
case Act_IncreaseIndentation:
commitIncreaseIndentation(act.R1, act.Loc);
break;
case Act_ClearDiagnostic:
commitClearDiagnostic(act.DiagIDs, act.R1);
break;
}
}
CachedActions.clear();
IsInTransaction = false;
return false;
}
void TransformActionsImpl::abortTransaction() {
assert(IsInTransaction && "No transaction started");
CachedActions.clear();
IsInTransaction = false;
}
void TransformActionsImpl::insert(SourceLocation loc, StringRef text) {
assert(IsInTransaction && "Actions only allowed during a transaction");
text = getUniqueText(text);
ActionData data;
data.Kind = Act_Insert;
data.Loc = loc;
data.Text1 = text;
CachedActions.push_back(data);
}
void TransformActionsImpl::insertAfterToken(SourceLocation loc, StringRef text) {
assert(IsInTransaction && "Actions only allowed during a transaction");
text = getUniqueText(text);
ActionData data;
data.Kind = Act_InsertAfterToken;
data.Loc = loc;
data.Text1 = text;
CachedActions.push_back(data);
}
void TransformActionsImpl::remove(SourceRange range) {
assert(IsInTransaction && "Actions only allowed during a transaction");
ActionData data;
data.Kind = Act_Remove;
data.R1 = range;
CachedActions.push_back(data);
}
void TransformActionsImpl::removeStmt(Stmt *S) {
assert(IsInTransaction && "Actions only allowed during a transaction");
ActionData data;
data.Kind = Act_RemoveStmt;
[AST] Update the comments of the various Expr::Ignore* + Related cleanups The description of what the various Expr::Ignore* do has drifted from the actual implementation. Inspection reveals that IgnoreParenImpCasts() is not equivalent to doing IgnoreParens() + IgnoreImpCasts() until reaching a fixed point, but IgnoreParenCasts() is equivalent to doing IgnoreParens() + IgnoreCasts() until reaching a fixed point. There is also a fair amount of duplication in the various Expr::Ignore* functions which increase the chance of further future inconsistencies. In preparation for the next patch which will factor out the implementation of the various Expr::Ignore*, do the following cleanups: Remove Stmt::IgnoreImplicit, in favor of Expr::IgnoreImplicit. IgnoreImplicit is the only function among all of the Expr::Ignore* which is available in Stmt. There are only a few users of Stmt::IgnoreImplicit. They can just use instead Expr::IgnoreImplicit like they have to do for the other Ignore*. Move Expr::IgnoreImpCasts() from Expr.h to Expr.cpp. This made no difference in the run-time with my usual benchmark (-fsyntax-only on all of Boost). While we are at it, make IgnoreParenNoopCasts take a const reference to the ASTContext for const correctness. Update the comments to match what the Expr::Ignore* are actually doing. I am not sure that listing exactly what each Expr::Ignore* do is optimal, but it certainly looks better than the current state which is in my opinion between misleading and just plain wrong. The whole patch is NFC (if you count removing Stmt::IgnoreImplicit as NFC). Differential Revision: https://reviews.llvm.org/D57266 Reviewed By: aaron.ballman llvm-svn: 353006
2019-02-04 03:50:56 +08:00
if (auto *E = dyn_cast<Expr>(S))
S = E->IgnoreImplicit(); // important for uniquing
data.S = S;
CachedActions.push_back(data);
}
void TransformActionsImpl::replace(SourceRange range, StringRef text) {
assert(IsInTransaction && "Actions only allowed during a transaction");
text = getUniqueText(text);
remove(range);
insert(range.getBegin(), text);
}
void TransformActionsImpl::replace(SourceRange range,
SourceRange replacementRange) {
assert(IsInTransaction && "Actions only allowed during a transaction");
ActionData data;
data.Kind = Act_Replace;
data.R1 = range;
data.R2 = replacementRange;
CachedActions.push_back(data);
}
void TransformActionsImpl::replaceText(SourceLocation loc, StringRef text,
StringRef replacementText) {
text = getUniqueText(text);
replacementText = getUniqueText(replacementText);
ActionData data;
data.Kind = Act_ReplaceText;
data.Loc = loc;
data.Text1 = text;
data.Text2 = replacementText;
CachedActions.push_back(data);
}
void TransformActionsImpl::replaceStmt(Stmt *S, StringRef text) {
assert(IsInTransaction && "Actions only allowed during a transaction");
text = getUniqueText(text);
insert(S->getBeginLoc(), text);
removeStmt(S);
}
void TransformActionsImpl::increaseIndentation(SourceRange range,
SourceLocation parentIndent) {
if (range.isInvalid()) return;
assert(IsInTransaction && "Actions only allowed during a transaction");
ActionData data;
data.Kind = Act_IncreaseIndentation;
data.R1 = range;
data.Loc = parentIndent;
CachedActions.push_back(data);
}
bool TransformActionsImpl::clearDiagnostic(ArrayRef<unsigned> IDs,
SourceRange range) {
assert(IsInTransaction && "Actions only allowed during a transaction");
if (!CapturedDiags.hasDiagnostic(IDs, range))
return false;
ActionData data;
data.Kind = Act_ClearDiagnostic;
data.R1 = range;
data.DiagIDs.append(IDs.begin(), IDs.end());
CachedActions.push_back(data);
return true;
}
bool TransformActionsImpl::canInsert(SourceLocation loc) {
if (loc.isInvalid())
return false;
SourceManager &SM = Ctx.getSourceManager();
if (SM.isInSystemHeader(SM.getExpansionLoc(loc)))
return false;
if (loc.isFileID())
return true;
return PP.isAtStartOfMacroExpansion(loc);
}
bool TransformActionsImpl::canInsertAfterToken(SourceLocation loc) {
if (loc.isInvalid())
return false;
SourceManager &SM = Ctx.getSourceManager();
if (SM.isInSystemHeader(SM.getExpansionLoc(loc)))
return false;
if (loc.isFileID())
return true;
return PP.isAtEndOfMacroExpansion(loc);
}
bool TransformActionsImpl::canRemoveRange(SourceRange range) {
return canInsert(range.getBegin()) && canInsertAfterToken(range.getEnd());
}
bool TransformActionsImpl::canReplaceRange(SourceRange range,
SourceRange replacementRange) {
return canRemoveRange(range) && canRemoveRange(replacementRange);
}
bool TransformActionsImpl::canReplaceText(SourceLocation loc, StringRef text) {
if (!canInsert(loc))
return false;
SourceManager &SM = Ctx.getSourceManager();
loc = SM.getExpansionLoc(loc);
// Break down the source location.
std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(loc);
// Try to load the file buffer.
bool invalidTemp = false;
StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
if (invalidTemp)
return false;
return file.substr(locInfo.second).startswith(text);
}
void TransformActionsImpl::commitInsert(SourceLocation loc, StringRef text) {
addInsertion(loc, text);
}
void TransformActionsImpl::commitInsertAfterToken(SourceLocation loc,
StringRef text) {
addInsertion(getLocForEndOfToken(loc, Ctx.getSourceManager(), PP), text);
}
void TransformActionsImpl::commitRemove(SourceRange range) {
addRemoval(CharSourceRange::getTokenRange(range));
}
void TransformActionsImpl::commitRemoveStmt(Stmt *S) {
assert(S);
if (StmtRemovals.count(S))
return; // already removed.
if (Expr *E = dyn_cast<Expr>(S)) {
commitRemove(E->getSourceRange());
commitInsert(E->getSourceRange().getBegin(), getARCMTMacroName());
} else
commitRemove(S->getSourceRange());
StmtRemovals.insert(S);
}
void TransformActionsImpl::commitReplace(SourceRange range,
SourceRange replacementRange) {
RangeComparison comp = CharRange::compare(replacementRange, range,
Ctx.getSourceManager(), PP);
assert(comp == Range_Contained);
if (comp != Range_Contained)
return; // Although we asserted, be extra safe for release build.
if (range.getBegin() != replacementRange.getBegin())
addRemoval(CharSourceRange::getCharRange(range.getBegin(),
replacementRange.getBegin()));
if (replacementRange.getEnd() != range.getEnd())
addRemoval(CharSourceRange::getTokenRange(
getLocForEndOfToken(replacementRange.getEnd(),
Ctx.getSourceManager(), PP),
range.getEnd()));
}
void TransformActionsImpl::commitReplaceText(SourceLocation loc,
StringRef text,
StringRef replacementText) {
SourceManager &SM = Ctx.getSourceManager();
loc = SM.getExpansionLoc(loc);
// canReplaceText already checked if loc points at text.
SourceLocation afterText = loc.getLocWithOffset(text.size());
addRemoval(CharSourceRange::getCharRange(loc, afterText));
commitInsert(loc, replacementText);
}
void TransformActionsImpl::commitIncreaseIndentation(SourceRange range,
SourceLocation parentIndent) {
SourceManager &SM = Ctx.getSourceManager();
IndentationRanges.push_back(
std::make_pair(CharRange(CharSourceRange::getTokenRange(range),
SM, PP),
SM.getExpansionLoc(parentIndent)));
}
void TransformActionsImpl::commitClearDiagnostic(ArrayRef<unsigned> IDs,
SourceRange range) {
CapturedDiags.clearDiagnostic(IDs, range);
}
void TransformActionsImpl::addInsertion(SourceLocation loc, StringRef text) {
SourceManager &SM = Ctx.getSourceManager();
loc = SM.getExpansionLoc(loc);
for (const CharRange &I : llvm::reverse(Removals)) {
if (!SM.isBeforeInTranslationUnit(loc, I.End))
break;
if (I.Begin.isBeforeInTranslationUnitThan(loc))
return;
}
Inserts[FullSourceLoc(loc, SM)].push_back(text);
}
void TransformActionsImpl::addRemoval(CharSourceRange range) {
CharRange newRange(range, Ctx.getSourceManager(), PP);
if (newRange.Begin == newRange.End)
return;
Inserts.erase(Inserts.upper_bound(newRange.Begin),
Inserts.lower_bound(newRange.End));
std::list<CharRange>::iterator I = Removals.end();
while (I != Removals.begin()) {
std::list<CharRange>::iterator RI = I;
--RI;
RangeComparison comp = newRange.compareWith(*RI);
switch (comp) {
case Range_Before:
--I;
break;
case Range_After:
Removals.insert(I, newRange);
return;
case Range_Contained:
return;
case Range_Contains:
RI->End = newRange.End;
LLVM_FALLTHROUGH;
case Range_ExtendsBegin:
newRange.End = RI->End;
Removals.erase(RI);
break;
case Range_ExtendsEnd:
RI->End = newRange.End;
return;
}
}
Removals.insert(Removals.begin(), newRange);
}
void TransformActionsImpl::applyRewrites(
TransformActions::RewriteReceiver &receiver) {
for (InsertsMap::iterator I = Inserts.begin(), E = Inserts.end(); I!=E; ++I) {
SourceLocation loc = I->first;
for (TextsVec::iterator
TI = I->second.begin(), TE = I->second.end(); TI != TE; ++TI) {
receiver.insert(loc, *TI);
}
}
for (std::vector<std::pair<CharRange, SourceLocation> >::iterator
I = IndentationRanges.begin(), E = IndentationRanges.end(); I!=E; ++I) {
CharSourceRange range = CharSourceRange::getCharRange(I->first.Begin,
I->first.End);
receiver.increaseIndentation(range, I->second);
}
for (std::list<CharRange>::iterator
I = Removals.begin(), E = Removals.end(); I != E; ++I) {
CharSourceRange range = CharSourceRange::getCharRange(I->Begin, I->End);
receiver.remove(range);
}
}
/// Stores text passed to the transformation methods to keep the string
/// "alive". Since the vast majority of text will be the same, we also unique
/// the strings using a StringMap.
StringRef TransformActionsImpl::getUniqueText(StringRef text) {
return UniqueText.insert(std::make_pair(text, false)).first->first();
}
/// Computes the source location just past the end of the token at
/// the given source location. If the location points at a macro, the whole
/// macro expansion is skipped.
SourceLocation TransformActionsImpl::getLocForEndOfToken(SourceLocation loc,
SourceManager &SM,
Preprocessor &PP) {
if (loc.isMacroID()) {
CharSourceRange Exp = SM.getExpansionRange(loc);
if (Exp.isCharRange())
return Exp.getEnd();
loc = Exp.getEnd();
}
return PP.getLocForEndOfToken(loc);
}
TransformActions::RewriteReceiver::~RewriteReceiver() { }
TransformActions::TransformActions(DiagnosticsEngine &diag,
CapturedDiagList &capturedDiags,
ASTContext &ctx, Preprocessor &PP)
: Diags(diag), CapturedDiags(capturedDiags) {
Impl = new TransformActionsImpl(capturedDiags, ctx, PP);
}
TransformActions::~TransformActions() {
delete static_cast<TransformActionsImpl*>(Impl);
}
void TransformActions::startTransaction() {
static_cast<TransformActionsImpl*>(Impl)->startTransaction();
}
bool TransformActions::commitTransaction() {
return static_cast<TransformActionsImpl*>(Impl)->commitTransaction();
}
void TransformActions::abortTransaction() {
static_cast<TransformActionsImpl*>(Impl)->abortTransaction();
}
void TransformActions::insert(SourceLocation loc, StringRef text) {
static_cast<TransformActionsImpl*>(Impl)->insert(loc, text);
}
void TransformActions::insertAfterToken(SourceLocation loc,
StringRef text) {
static_cast<TransformActionsImpl*>(Impl)->insertAfterToken(loc, text);
}
void TransformActions::remove(SourceRange range) {
static_cast<TransformActionsImpl*>(Impl)->remove(range);
}
void TransformActions::removeStmt(Stmt *S) {
static_cast<TransformActionsImpl*>(Impl)->removeStmt(S);
}
void TransformActions::replace(SourceRange range, StringRef text) {
static_cast<TransformActionsImpl*>(Impl)->replace(range, text);
}
void TransformActions::replace(SourceRange range,
SourceRange replacementRange) {
static_cast<TransformActionsImpl*>(Impl)->replace(range, replacementRange);
}
void TransformActions::replaceStmt(Stmt *S, StringRef text) {
static_cast<TransformActionsImpl*>(Impl)->replaceStmt(S, text);
}
void TransformActions::replaceText(SourceLocation loc, StringRef text,
StringRef replacementText) {
static_cast<TransformActionsImpl*>(Impl)->replaceText(loc, text,
replacementText);
}
void TransformActions::increaseIndentation(SourceRange range,
SourceLocation parentIndent) {
static_cast<TransformActionsImpl*>(Impl)->increaseIndentation(range,
parentIndent);
}
bool TransformActions::clearDiagnostic(ArrayRef<unsigned> IDs,
SourceRange range) {
return static_cast<TransformActionsImpl*>(Impl)->clearDiagnostic(IDs, range);
}
void TransformActions::applyRewrites(RewriteReceiver &receiver) {
static_cast<TransformActionsImpl*>(Impl)->applyRewrites(receiver);
}
DiagnosticBuilder TransformActions::report(SourceLocation loc, unsigned diagId,
SourceRange range) {
assert(!static_cast<TransformActionsImpl *>(Impl)->isInTransaction() &&
"Errors should be emitted out of a transaction");
return Diags.Report(loc, diagId) << range;
}
void TransformActions::reportError(StringRef message, SourceLocation loc,
SourceRange range) {
report(loc, diag::err_mt_message, range) << message;
}
void TransformActions::reportWarning(StringRef message, SourceLocation loc,
SourceRange range) {
report(loc, diag::warn_mt_message, range) << message;
}
void TransformActions::reportNote(StringRef message, SourceLocation loc,
SourceRange range) {
report(loc, diag::note_mt_message, range) << message;
}