mirror of
https://github.com/capstone-engine/llvm-capstone.git
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8ae1203992
llvm-svn: 208163
203 lines
5.9 KiB
C++
203 lines
5.9 KiB
C++
//===--- TransProtectedScope.cpp - Transformations to ARC mode ------------===//
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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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//
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// Adds brackets in case statements that "contain" initialization of retaining
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// variable, thus emitting the "switch case is in protected scope" error.
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//
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//===----------------------------------------------------------------------===//
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#include "Transforms.h"
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#include "Internals.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Sema/SemaDiagnostic.h"
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using namespace clang;
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using namespace arcmt;
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using namespace trans;
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namespace {
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class LocalRefsCollector : public RecursiveASTVisitor<LocalRefsCollector> {
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SmallVectorImpl<DeclRefExpr *> &Refs;
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public:
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LocalRefsCollector(SmallVectorImpl<DeclRefExpr *> &refs)
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: Refs(refs) { }
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bool VisitDeclRefExpr(DeclRefExpr *E) {
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if (ValueDecl *D = E->getDecl())
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if (D->getDeclContext()->getRedeclContext()->isFunctionOrMethod())
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Refs.push_back(E);
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return true;
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}
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};
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struct CaseInfo {
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SwitchCase *SC;
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SourceRange Range;
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enum {
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St_Unchecked,
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St_CannotFix,
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St_Fixed
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} State;
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CaseInfo() : SC(nullptr), State(St_Unchecked) {}
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CaseInfo(SwitchCase *S, SourceRange Range)
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: SC(S), Range(Range), State(St_Unchecked) {}
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};
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class CaseCollector : public RecursiveASTVisitor<CaseCollector> {
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ParentMap &PMap;
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SmallVectorImpl<CaseInfo> &Cases;
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public:
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CaseCollector(ParentMap &PMap, SmallVectorImpl<CaseInfo> &Cases)
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: PMap(PMap), Cases(Cases) { }
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bool VisitSwitchStmt(SwitchStmt *S) {
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SwitchCase *Curr = S->getSwitchCaseList();
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if (!Curr)
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return true;
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Stmt *Parent = getCaseParent(Curr);
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Curr = Curr->getNextSwitchCase();
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// Make sure all case statements are in the same scope.
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while (Curr) {
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if (getCaseParent(Curr) != Parent)
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return true;
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Curr = Curr->getNextSwitchCase();
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}
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SourceLocation NextLoc = S->getLocEnd();
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Curr = S->getSwitchCaseList();
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// We iterate over case statements in reverse source-order.
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while (Curr) {
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Cases.push_back(CaseInfo(Curr,SourceRange(Curr->getLocStart(), NextLoc)));
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NextLoc = Curr->getLocStart();
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Curr = Curr->getNextSwitchCase();
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}
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return true;
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}
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Stmt *getCaseParent(SwitchCase *S) {
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Stmt *Parent = PMap.getParent(S);
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while (Parent && (isa<SwitchCase>(Parent) || isa<LabelStmt>(Parent)))
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Parent = PMap.getParent(Parent);
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return Parent;
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}
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};
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class ProtectedScopeFixer {
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MigrationPass &Pass;
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SourceManager &SM;
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SmallVector<CaseInfo, 16> Cases;
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SmallVector<DeclRefExpr *, 16> LocalRefs;
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public:
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ProtectedScopeFixer(BodyContext &BodyCtx)
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: Pass(BodyCtx.getMigrationContext().Pass),
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SM(Pass.Ctx.getSourceManager()) {
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CaseCollector(BodyCtx.getParentMap(), Cases)
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.TraverseStmt(BodyCtx.getTopStmt());
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LocalRefsCollector(LocalRefs).TraverseStmt(BodyCtx.getTopStmt());
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SourceRange BodyRange = BodyCtx.getTopStmt()->getSourceRange();
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const CapturedDiagList &DiagList = Pass.getDiags();
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// Copy the diagnostics so we don't have to worry about invaliding iterators
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// from the diagnostic list.
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SmallVector<StoredDiagnostic, 16> StoredDiags;
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StoredDiags.append(DiagList.begin(), DiagList.end());
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SmallVectorImpl<StoredDiagnostic>::iterator
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I = StoredDiags.begin(), E = StoredDiags.end();
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while (I != E) {
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if (I->getID() == diag::err_switch_into_protected_scope &&
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isInRange(I->getLocation(), BodyRange)) {
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handleProtectedScopeError(I, E);
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continue;
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}
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++I;
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}
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}
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void handleProtectedScopeError(
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SmallVectorImpl<StoredDiagnostic>::iterator &DiagI,
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SmallVectorImpl<StoredDiagnostic>::iterator DiagE){
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Transaction Trans(Pass.TA);
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assert(DiagI->getID() == diag::err_switch_into_protected_scope);
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SourceLocation ErrLoc = DiagI->getLocation();
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bool handledAllNotes = true;
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++DiagI;
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for (; DiagI != DiagE && DiagI->getLevel() == DiagnosticsEngine::Note;
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++DiagI) {
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if (!handleProtectedNote(*DiagI))
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handledAllNotes = false;
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}
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if (handledAllNotes)
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Pass.TA.clearDiagnostic(diag::err_switch_into_protected_scope, ErrLoc);
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}
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bool handleProtectedNote(const StoredDiagnostic &Diag) {
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assert(Diag.getLevel() == DiagnosticsEngine::Note);
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for (unsigned i = 0; i != Cases.size(); i++) {
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CaseInfo &info = Cases[i];
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if (isInRange(Diag.getLocation(), info.Range)) {
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if (info.State == CaseInfo::St_Unchecked)
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tryFixing(info);
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assert(info.State != CaseInfo::St_Unchecked);
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if (info.State == CaseInfo::St_Fixed) {
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Pass.TA.clearDiagnostic(Diag.getID(), Diag.getLocation());
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return true;
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}
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return false;
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}
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}
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return false;
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}
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void tryFixing(CaseInfo &info) {
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assert(info.State == CaseInfo::St_Unchecked);
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if (hasVarReferencedOutside(info)) {
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info.State = CaseInfo::St_CannotFix;
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return;
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}
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Pass.TA.insertAfterToken(info.SC->getColonLoc(), " {");
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Pass.TA.insert(info.Range.getEnd(), "}\n");
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info.State = CaseInfo::St_Fixed;
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}
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bool hasVarReferencedOutside(CaseInfo &info) {
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for (unsigned i = 0, e = LocalRefs.size(); i != e; ++i) {
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DeclRefExpr *DRE = LocalRefs[i];
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if (isInRange(DRE->getDecl()->getLocation(), info.Range) &&
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!isInRange(DRE->getLocation(), info.Range))
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return true;
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}
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return false;
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}
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bool isInRange(SourceLocation Loc, SourceRange R) {
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if (Loc.isInvalid())
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return false;
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return !SM.isBeforeInTranslationUnit(Loc, R.getBegin()) &&
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SM.isBeforeInTranslationUnit(Loc, R.getEnd());
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}
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};
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} // anonymous namespace
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void ProtectedScopeTraverser::traverseBody(BodyContext &BodyCtx) {
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ProtectedScopeFixer Fix(BodyCtx);
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}
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