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Keep an explicit stack of function and block scopes, each element of 

which has the label map, switch statement stack, etc. Previously, we
had a single set of maps in Sema (for the function) along with a stack
of block scopes. However, this lead to funky behavior with nested
functions, e.g., in the member functions of local classes.

The explicit-stack approach is far cleaner, and we retain a 1-element
cache so that we're not malloc/free'ing every time we enter a
function. Fixes PR6382.

Also, tweaked the unused-variable warning suppression logic to look at
errors within a given Scope rather than within a given function. The
prior code wasn't looking at the right number-of-errors count when
dealing with blocks, since the block's count would be deallocated
before we got to ActOnPopScope. This approach works with nested
blocks/functions, and gives tighter error recovery.

llvm-svn: 97518
This commit is contained in:
Douglas Gregor 2010-03-01 23:15:13 +00:00
parent 3144e66377
commit 9a28e84b32
12 changed files with 230 additions and 136 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
clang/include/clang/Parse/Scope.h
View File

@ -129,6 +129,9 @@ private:
typedef llvm::SmallVector<Action::DeclPtrTy, 2> UsingDirectivesTy;
UsingDirectivesTy UsingDirectives;
/// \brief The number of errors at the start of the given scope.
unsigned NumErrorsAtStart;
public:
Scope(Scope *Parent, unsigned ScopeFlags) {
Init(Parent, ScopeFlags);
@ -208,6 +211,10 @@ public:
void* getEntity() const { return Entity; }
void setEntity(void *E) { Entity = E; }
/// \brief Retrieve the number of errors that had been emitted when we
/// entered this scope.
unsigned getNumErrorsAtStart() const { return NumErrorsAtStart; }
/// isClassScope - Return true if this scope is a class/struct/union scope.
bool isClassScope() const {
return (getFlags() & Scope::ClassScope);
@ -300,6 +307,7 @@ public:
DeclsInScope.clear();
UsingDirectives.clear();
Entity = 0;
NumErrorsAtStart = 0;
}
};

1
clang/lib/Parse/Parser.cpp
View File

@ -274,6 +274,7 @@ void Parser::EnterScope(unsigned ScopeFlags) {
} else {
CurScope = new Scope(CurScope, ScopeFlags);
}
CurScope->NumErrorsAtStart = Diags.getNumErrors();
}
/// ExitScope - Pop a scope off the scope stack.

62
clang/lib/Sema/Sema.cpp
View File

@ -27,6 +27,17 @@
#include "clang/Basic/TargetInfo.h"
using namespace clang;
FunctionScopeInfo::~FunctionScopeInfo() { }
void FunctionScopeInfo::Clear(unsigned NumErrors) {
NeedsScopeChecking = false;
LabelMap.clear();
SwitchStack.clear();
NumErrorsAtStartOfFunction = NumErrors;
}
BlockScopeInfo::~BlockScopeInfo() { }
static inline RecordDecl *CreateStructDecl(ASTContext &C, const char *Name) {
if (C.getLangOptions().CPlusPlus)
return CXXRecordDecl::Create(C, TagDecl::TK_struct,
@ -116,7 +127,7 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
LangOpts(pp.getLangOptions()), PP(pp), Context(ctxt), Consumer(consumer),
Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
ExternalSource(0), CodeCompleter(CodeCompleter), CurContext(0),
CurBlock(0), PackContext(0), ParsingDeclDepth(0),
PackContext(0), TopFunctionScope(0), ParsingDeclDepth(0),
IdResolver(pp.getLangOptions()), StdNamespace(0), StdBadAlloc(0),
GlobalNewDeleteDeclared(false),
CompleteTranslationUnit(CompleteTranslationUnit),
@ -127,8 +138,6 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
if (getLangOptions().CPlusPlus)
FieldCollector.reset(new CXXFieldCollector());
NumErrorsAtStartOfFunction = 0;
// Tell diagnostics how to render things from the AST library.
PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
&Context);
@ -140,6 +149,8 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
Sema::~Sema() {
if (PackContext) FreePackedContext();
delete TheTargetAttributesSema;
while (!FunctionScopes.empty())
PopFunctionOrBlockScope();
}
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
@ -344,6 +355,51 @@ Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
return Builder;
}
/// \brief Enter a new function scope
void Sema::PushFunctionScope() {
if (FunctionScopes.empty()) {
// Use the "top" function scope rather than having to allocate memory for
// a new scope.
TopFunctionScope.Clear(getDiagnostics().getNumErrors());
FunctionScopes.push_back(&TopFunctionScope);
return;
}
FunctionScopes.push_back(
new FunctionScopeInfo(getDiagnostics().getNumErrors()));
}
void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics().getNumErrors(),
BlockScope, Block));
}
void Sema::PopFunctionOrBlockScope() {
if (FunctionScopes.back() != &TopFunctionScope)
delete FunctionScopes.back();
else
TopFunctionScope.Clear(getDiagnostics().getNumErrors());
FunctionScopes.pop_back();
}
/// \brief Determine whether any errors occurred within this function/method/
/// block.
bool Sema::hasAnyErrorsInThisFunction() const {
unsigned NumErrors = TopFunctionScope.NumErrorsAtStartOfFunction;
if (!FunctionScopes.empty())
NumErrors = FunctionScopes.back()->NumErrorsAtStartOfFunction;
return NumErrors != getDiagnostics().getNumErrors();
}
BlockScopeInfo *Sema::getCurBlock() {
if (FunctionScopes.empty())
return 0;
return dyn_cast<BlockScopeInfo>(FunctionScopes.back());
}
void Sema::ActOnComment(SourceRange Comment) {
Context.Comments.push_back(Comment);
}

108
clang/lib/Sema/Sema.h
View File

@ -111,6 +111,19 @@ namespace clang {
/// \brief Retains information about a function, method, or block that is
/// currently being parsed.
struct FunctionScopeInfo {
/// \brief Whether this scope information structure defined information for
/// a block.
bool IsBlockInfo;
/// \brief Set true when a function, method contains a VLA or ObjC try block,
/// which introduce scopes that need to be checked for goto conditions. If a
/// function does not contain this, then it need not have the jump checker run on it.
bool NeedsScopeChecking;
/// \brief The number of errors that had occurred before starting this
/// function or block.
unsigned NumErrorsAtStartOfFunction;
/// LabelMap - This is a mapping from label identifiers to the LabelStmt for
/// it (which acts like the label decl in some ways). Forward referenced
/// labels have a LabelStmt created for them with a null location & SubStmt.
@ -120,11 +133,15 @@ struct FunctionScopeInfo {
/// block.
llvm::SmallVector<SwitchStmt*, 8> SwitchStack;
/// \brief Whether this scope information structure defined information for
/// a block.
bool IsBlockInfo;
FunctionScopeInfo(unsigned NumErrors)
: IsBlockInfo(false), NeedsScopeChecking(false),
NumErrorsAtStartOfFunction(NumErrors) { }
FunctionScopeInfo() : IsBlockInfo(false) { }
virtual ~FunctionScopeInfo();
/// \brief Clear out the information in this function scope, making it
/// suitable for reuse.
void Clear(unsigned NumErrors);
static bool classof(const FunctionScopeInfo *FSI) { return true; }
};
@ -147,17 +164,14 @@ struct BlockScopeInfo : FunctionScopeInfo {
/// return types, if any, in the block body.
QualType ReturnType;
/// SavedNumErrorsAtStartOfFunction - This is the value of the
/// NumErrorsAtStartOfFunction variable at the point when the block started.
unsigned SavedNumErrorsAtStartOfFunction;
BlockScopeInfo(unsigned NumErrors, Scope *BlockScope, BlockDecl *Block)
: FunctionScopeInfo(NumErrors), hasPrototype(false), isVariadic(false),
hasBlockDeclRefExprs(false), TheDecl(Block), TheScope(BlockScope)
{
IsBlockInfo = true;
}
/// SavedFunctionNeedsScopeChecking - This is the value of
/// CurFunctionNeedsScopeChecking at the point when the block started.
bool SavedFunctionNeedsScopeChecking;
BlockScopeInfo *PrevBlockInfo;
BlockScopeInfo() : FunctionScopeInfo() { IsBlockInfo = true; }
virtual ~BlockScopeInfo();
static bool classof(const FunctionScopeInfo *FSI) { return FSI->IsBlockInfo; }
static bool classof(const BlockScopeInfo *BSI) { return true; }
@ -219,45 +233,25 @@ public:
/// CurContext - This is the current declaration context of parsing.
DeclContext *CurContext;
/// CurBlock - If inside of a block definition, this contains a pointer to
/// the active block object that represents it.
BlockScopeInfo *CurBlock;
/// PackContext - Manages the stack for #pragma pack. An alignment
/// of 0 indicates default alignment.
void *PackContext; // Really a "PragmaPackStack*"
/// FunctionLabelMap - This is a mapping from label identifiers to the
/// LabelStmt for it (which acts like the label decl in some ways). Forward
/// referenced labels have a LabelStmt created for them with a null location &
/// SubStmt.
///
/// Note that this should always be accessed through getLabelMap() in order
/// to handle blocks properly.
llvm::DenseMap<IdentifierInfo*, LabelStmt*> FunctionLabelMap;
/// \brief Stack containing information about each of the nested function,
/// block, and method scopes that are currently active.
llvm::SmallVector<FunctionScopeInfo *, 4> FunctionScopes;
/// FunctionSwitchStack - This is the current set of active switch statements
/// in the top level function. Clients should always use getSwitchStack() to
/// handle the case when they are in a block.
llvm::SmallVector<SwitchStmt*, 8> FunctionSwitchStack;
/// \brief Cached function scope object used for the top function scope
/// and when there is no function scope (in error cases).
///
/// This should never be accessed directly; rather, it's address will be
/// pushed into \c FunctionScopes when we want to re-use it.
FunctionScopeInfo TopFunctionScope;
/// ExprTemporaries - This is the stack of temporaries that are created by
/// the current full expression.
llvm::SmallVector<CXXTemporary*, 8> ExprTemporaries;
/// NumErrorsAtStartOfFunction - This is the number of errors that were
/// emitted to the diagnostics object at the start of the current
/// function/method definition. If no additional errors are emitted by the
/// end of the function, we assume the AST is well formed enough to be
/// worthwhile to emit control flow diagnostics.
unsigned NumErrorsAtStartOfFunction;
/// CurFunctionNeedsScopeChecking - This is set to true when a function or
/// ObjC method body contains a VLA or an ObjC try block, which introduce
/// scopes that need to be checked for goto conditions. If a function does
/// not contain this, then it need not have the jump checker run on it.
bool CurFunctionNeedsScopeChecking;
/// ExtVectorDecls - This is a list all the extended vector types. This allows
/// us to associate a raw vector type with one of the ext_vector type names.
/// This is only necessary for issuing pretty diagnostics.
@ -633,18 +627,42 @@ public:
virtual void ActOnEndOfTranslationUnit();
void PushFunctionScope();
void PushBlockScope(Scope *BlockScope, BlockDecl *Block);
void PopFunctionOrBlockScope();
/// getLabelMap() - Return the current label map. If we're in a block, we
/// return it.
llvm::DenseMap<IdentifierInfo*, LabelStmt*> &getLabelMap() {
return CurBlock ? CurBlock->LabelMap : FunctionLabelMap;
if (FunctionScopes.empty())
return TopFunctionScope.LabelMap;
return FunctionScopes.back()->LabelMap;
}
/// getSwitchStack - This is returns the switch stack for the current block or
/// function.
llvm::SmallVector<SwitchStmt*,8> &getSwitchStack() {
return CurBlock ? CurBlock->SwitchStack : FunctionSwitchStack;
if (FunctionScopes.empty())
return TopFunctionScope.SwitchStack;
return FunctionScopes.back()->SwitchStack;
}
/// \brief Determine whether the current function or block needs scope
/// checking.
bool &FunctionNeedsScopeChecking() {
if (FunctionScopes.empty())
return TopFunctionScope.NeedsScopeChecking;
return FunctionScopes.back()->NeedsScopeChecking;
}
bool hasAnyErrorsInThisFunction() const;
/// \brief Retrieve the current block, if any.
BlockScopeInfo *getCurBlock();
/// WeakTopLevelDeclDecls - access to #pragma weak-generated Decls
llvm::SmallVector<Decl*,2> &WeakTopLevelDecls() { return WeakTopLevelDecl; }

1
clang/lib/Sema/SemaChecking.cpp
View File

@ -506,6 +506,7 @@ bool Sema::SemaBuiltinVAStart(CallExpr *TheCall) {
}
// Determine whether the current function is variadic or not.
BlockScopeInfo *CurBlock = getCurBlock();
bool isVariadic;
if (CurBlock)
isVariadic = CurBlock->isVariadic;

5
clang/lib/Sema/SemaCodeComplete.cpp
View File

@ -1137,8 +1137,9 @@ static void AddOrdinaryNameResults(Action::CodeCompletionContext CCC,
else if (ObjCMethodDecl *Method
= dyn_cast<ObjCMethodDecl>(SemaRef.CurContext))
isVoid = Method->getResultType()->isVoidType();
else if (SemaRef.CurBlock && !SemaRef.CurBlock->ReturnType.isNull())
isVoid = SemaRef.CurBlock->ReturnType->isVoidType();
else if (SemaRef.getCurBlock() &&
!SemaRef.getCurBlock()->ReturnType.isNull())
isVoid = SemaRef.getCurBlock()->ReturnType->isVoidType();
Pattern = new CodeCompletionString;
Pattern->AddTypedTextChunk("return");
if (!isVoid) {

50
clang/lib/Sema/SemaDecl.cpp
View File

@ -554,7 +554,7 @@ void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
// Diagnose unused variables in this scope.
if (ShouldDiagnoseUnusedDecl(D) &&
NumErrorsAtStartOfFunction == getDiagnostics().getNumErrors())
S->getNumErrorsAtStart() == getDiagnostics().getNumErrors())
Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName();
// Remove this name from our lexical scope.
@ -2180,7 +2180,7 @@ Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
// then it shall have block scope.
QualType T = NewTD->getUnderlyingType();
if (T->isVariablyModifiedType()) {
CurFunctionNeedsScopeChecking = true;
FunctionNeedsScopeChecking() = true;
if (S->getFnParent() == 0) {
bool SizeIsNegative;
@ -2507,7 +2507,7 @@ void Sema::CheckVariableDeclaration(VarDecl *NewVD,
// which may impact compile time. See if we can find a better solution
// to this, perhaps only checking functions that contain gotos in C++?
(LangOpts.CPlusPlus && NewVD->hasLocalStorage()))
CurFunctionNeedsScopeChecking = true;
FunctionNeedsScopeChecking() = true;
if ((isVM && NewVD->hasLinkage()) ||
(T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
@ -4084,8 +4084,8 @@ Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) {
else
FD = cast<FunctionDecl>(D.getAs<Decl>());
CurFunctionNeedsScopeChecking = false;
NumErrorsAtStartOfFunction = getDiagnostics().getNumErrors();
// Enter a new function scope
PushFunctionScope();
// See if this is a redefinition.
// But don't complain if we're in GNU89 mode and the previous definition
@ -4217,11 +4217,9 @@ Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
// Verify and clean out per-function state.
assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?");
// Check goto/label use.
for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) {
I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) {
LabelStmt *L = I->second;
// Verify that we have no forward references left. If so, there was a goto
@ -4257,25 +4255,34 @@ Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
Elements.push_back(L);
Compound->setStmts(Context, &Elements[0], Elements.size());
}
FunctionLabelMap.clear();
if (!Body) return D;
if (Body) {
CheckUnreachable(AC);
CheckUnreachable(AC);
// C++ constructors that have function-try-blocks can't have return
// statements in the handlers of that block. (C++ [except.handle]p14)
// Verify this.
if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
// Verify that that gotos and switch cases don't jump into scopes illegally.
if (CurFunctionNeedsScopeChecking &&
NumErrorsAtStartOfFunction == getDiagnostics().getNumErrors())
DiagnoseInvalidJumps(Body);
// Verify that that gotos and switch cases don't jump into scopes illegally.
if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction())
DiagnoseInvalidJumps(Body);
// C++ constructors that have function-try-blocks can't have return
// statements in the handlers of that block. (C++ [except.handle]p14)
// Verify this.
if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl))
MarkBaseAndMemberDestructorsReferenced(Destructor);
if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl))
MarkBaseAndMemberDestructorsReferenced(Destructor);
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
// deletion in some later function.
if (PP.getDiagnostics().hasErrorOccurred())
ExprTemporaries.clear();
assert(ExprTemporaries.empty() && "Leftover temporaries in function");
}
PopFunctionOrBlockScope();
// If any errors have occurred, clear out any temporaries that may have
// been leftover. This ensures that these temporaries won't be picked up for
@ -4283,7 +4290,6 @@ Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg,
if (getDiagnostics().hasErrorOccurred())
ExprTemporaries.clear();
assert(ExprTemporaries.empty() && "Leftover temporaries in function");
return D;
}

6
clang/lib/Sema/SemaDeclObjC.cpp
View File

@ -49,9 +49,6 @@ void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, DeclPtrTy D) {
if (!MDecl)
return;
CurFunctionNeedsScopeChecking = false;
NumErrorsAtStartOfFunction = getDiagnostics().getNumErrors();
// Allow the rest of sema to find private method decl implementations.
if (MDecl->isInstanceMethod())
AddInstanceMethodToGlobalPool(MDecl);
@ -60,6 +57,7 @@ void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, DeclPtrTy D) {
// Allow all of Sema to see that we are entering a method definition.
PushDeclContext(FnBodyScope, MDecl);
PushFunctionScope();
// Create Decl objects for each parameter, entrring them in the scope for
// binding to their use.
@ -1989,7 +1987,7 @@ Sema::DeclPtrTy Sema::ActOnMethodDeclaration(
// Make sure we can establish a context for the method.
if (!ClassDecl) {
Diag(MethodLoc, diag::error_missing_method_context);
FunctionLabelMap.clear();
getLabelMap().clear();
return DeclPtrTy();
}
QualType resultDeclType;

68
clang/lib/Sema/SemaExpr.cpp
View File

@ -396,7 +396,7 @@ Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
/// This also keeps the 'hasBlockDeclRefExprs' in the BlockScopeInfo records
/// up-to-date.
///
static bool ShouldSnapshotBlockValueReference(BlockScopeInfo *CurBlock,
static bool ShouldSnapshotBlockValueReference(Sema &S, BlockScopeInfo *CurBlock,
ValueDecl *VD) {
// If the value is defined inside the block, we couldn't snapshot it even if
// we wanted to.
@ -421,8 +421,12 @@ static bool ShouldSnapshotBlockValueReference(BlockScopeInfo *CurBlock,
// which case that outer block doesn't get "hasBlockDeclRefExprs") or it may
// be defined outside all of the current blocks (in which case the blocks do
// all get the bit). Walk the nesting chain.
for (BlockScopeInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock;
NextBlock = NextBlock->PrevBlockInfo) {
for (unsigned I = S.FunctionScopes.size() - 1; I; --I) {
BlockScopeInfo *NextBlock = dyn_cast<BlockScopeInfo>(S.FunctionScopes[I]);
if (!NextBlock)
continue;
// If we found the defining block for the variable, don't mark the block as
// having a reference outside it.
if (NextBlock->TheDecl == VD->getDeclContext())
@ -1597,7 +1601,8 @@ Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
// We do not do this for things like enum constants, global variables, etc,
// as they do not get snapshotted.
//
if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) {
if (getCurBlock() &&
ShouldSnapshotBlockValueReference(*this, getCurBlock(), VD)) {
if (VD->getType().getTypePtr()->isVariablyModifiedType()) {
Diag(Loc, diag::err_ref_vm_type);
Diag(D->getLocation(), diag::note_declared_at);
@ -6722,29 +6727,15 @@ Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
/// ActOnBlockStart - This callback is invoked when a block literal is started.
void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
// Analyze block parameters.
BlockScopeInfo *BSI = new BlockScopeInfo();
// Add BSI to CurBlock.
BSI->PrevBlockInfo = CurBlock;
CurBlock = BSI;
BSI->ReturnType = QualType();
BSI->TheScope = BlockScope;
BSI->hasBlockDeclRefExprs = false;
BSI->hasPrototype = false;
BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking;
BSI->SavedNumErrorsAtStartOfFunction = NumErrorsAtStartOfFunction;
CurFunctionNeedsScopeChecking = false;
NumErrorsAtStartOfFunction = getDiagnostics().getNumErrors();
BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc);
CurContext->addDecl(BSI->TheDecl);
PushDeclContext(BlockScope, BSI->TheDecl);
BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
PushBlockScope(BlockScope, Block);
CurContext->addDecl(Block);
PushDeclContext(BlockScope, Block);
}
void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
BlockScopeInfo *CurBlock = getCurBlock();
if (ParamInfo.getNumTypeObjects() == 0
|| ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) {
@ -6847,15 +6838,9 @@ void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
/// ActOnBlockError - If there is an error parsing a block, this callback
/// is invoked to pop the information about the block from the action impl.
void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
// Ensure that CurBlock is deleted.
llvm::OwningPtr<BlockScopeInfo> CC(CurBlock);
CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking;
NumErrorsAtStartOfFunction = CurBlock->SavedNumErrorsAtStartOfFunction;
// Pop off CurBlock, handle nested blocks.
PopDeclContext();
CurBlock = CurBlock->PrevBlockInfo;
PopFunctionOrBlockScope();
// FIXME: Delete the ParmVarDecl objects as well???
}
@ -6867,14 +6852,10 @@ Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
if (!LangOpts.Blocks)
Diag(CaretLoc, diag::err_blocks_disable);
// Ensure that CurBlock is deleted.
llvm::OwningPtr<BlockScopeInfo> BSI(CurBlock);
BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
PopDeclContext();
// Pop off CurBlock, handle nested blocks.
CurBlock = CurBlock->PrevBlockInfo;
QualType RetTy = Context.VoidTy;
if (!BSI->ReturnType.isNull())
RetTy = BSI->ReturnType;
@ -6898,13 +6879,9 @@ Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
BlockTy = Context.getBlockPointerType(BlockTy);
// If needed, diagnose invalid gotos and switches in the block.
if (CurFunctionNeedsScopeChecking &&
NumErrorsAtStartOfFunction == getDiagnostics().getNumErrors())
if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction())
DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get()));
CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking;
NumErrorsAtStartOfFunction = BSI->SavedNumErrorsAtStartOfFunction;
BSI->TheDecl->setBody(body.takeAs<CompoundStmt>());
bool Good = true;
@ -6922,15 +6899,18 @@ Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
Good = false;
}
BSI->LabelMap.clear();
if (!Good)
if (!Good) {
PopFunctionOrBlockScope();
return ExprError();
}
AnalysisContext AC(BSI->TheDecl);
CheckFallThroughForBlock(BlockTy, BSI->TheDecl->getBody(), AC);
CheckUnreachable(AC);
return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy,
BSI->hasBlockDeclRefExprs));
Expr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy,
BSI->hasBlockDeclRefExprs);
PopFunctionOrBlockScope();
return Owned(Result);
}
Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,

9
clang/lib/Sema/SemaStmt.cpp
View File

@ -1036,6 +1036,7 @@ Action::OwningStmtResult
Sema::ActOnBlockReturnStmt(SourceLocation ReturnLoc, Expr *RetValExp) {
// If this is the first return we've seen in the block, infer the type of
// the block from it.
BlockScopeInfo *CurBlock = getCurBlock();
if (CurBlock->ReturnType.isNull()) {
if (RetValExp) {
// Don't call UsualUnaryConversions(), since we don't want to do
@ -1130,7 +1131,7 @@ static bool IsReturnCopyElidable(ASTContext &Ctx, QualType RetType,
Action::OwningStmtResult
Sema::ActOnReturnStmt(SourceLocation ReturnLoc, ExprArg rex) {
Expr *RetValExp = rex.takeAs<Expr>();
if (CurBlock)
if (getCurBlock())
return ActOnBlockReturnStmt(ReturnLoc, RetValExp);
QualType FnRetType;
@ -1500,7 +1501,7 @@ Sema::ActOnObjCAtFinallyStmt(SourceLocation AtLoc, StmtArg Body) {
Action::OwningStmtResult
Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc,
StmtArg Try, StmtArg Catch, StmtArg Finally) {
CurFunctionNeedsScopeChecking = true;
FunctionNeedsScopeChecking() = true;
return Owned(new (Context) ObjCAtTryStmt(AtLoc, Try.takeAs<Stmt>(),
Catch.takeAs<Stmt>(),
Finally.takeAs<Stmt>()));
@ -1533,7 +1534,7 @@ Sema::ActOnObjCAtThrowStmt(SourceLocation AtLoc, ExprArg expr,Scope *CurScope) {
Action::OwningStmtResult
Sema::ActOnObjCAtSynchronizedStmt(SourceLocation AtLoc, ExprArg SynchExpr,
StmtArg SynchBody) {
CurFunctionNeedsScopeChecking = true;
FunctionNeedsScopeChecking() = true;
// Make sure the expression type is an ObjC pointer or "void *".
Expr *SyncExpr = static_cast<Expr*>(SynchExpr.get());
@ -1643,7 +1644,7 @@ Sema::ActOnCXXTryBlock(SourceLocation TryLoc, StmtArg TryBlock,
// Neither of these are explicitly forbidden, but every compiler detects them
// and warns.
CurFunctionNeedsScopeChecking = true;
FunctionNeedsScopeChecking() = true;
RawHandlers.release();
return Owned(CXXTryStmt::Create(Context, TryLoc,
static_cast<Stmt*>(TryBlock.release()),

9
clang/test/Sema/warn-unused-variables.c
View File

@ -1,4 +1,4 @@
// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -verify %s
// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -fblocks -verify %s
struct s0 {
unsigned int i;
@ -23,3 +23,10 @@ int f2() {
int X = 4; // Shouldn't have a bogus 'unused variable X' warning.
return Y + X; // expected-error {{use of undeclared identifier 'Y'}}
}
int f3() {
int X1 = 4;
(void)(Y1 + X1); // expected-error {{use of undeclared identifier 'Y1'}}
(void)(^() { int X = 4; }); // expected-warning{{unused}}
(void)(^() { int X = 4; return Y + X; }); // expected-error {{use of undeclared identifier 'Y'}}
}

17
clang/test/SemaCXX/local-classes.cpp Normal file
View File

@ -0,0 +1,17 @@
// RUN: %clang_cc1 -fsyntax-only -verify %s
namespace PR6382 {
int foo()
{
goto error;
{
struct BitPacker {
BitPacker() {}
};
BitPacker packer;
}
error:
return -1;
}
}