From 36c49e3f258dced101949edabd72e9bc3f1dedc4 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Fri, 17 Sep 2010 15:54:40 +0000
Subject: Vendor import of clang r114020 (from the release_28 branch):
http://llvm.org/svn/llvm-project/cfe/branches/release_28@114020
Approved by: rpaulo (mentor)
---
lib/Sema/Sema.cpp | 261 ++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 184 insertions(+), 77 deletions(-)
(limited to 'lib/Sema/Sema.cpp')
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index cddc84e..17817d4 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -12,26 +12,36 @@
//
//===----------------------------------------------------------------------===//
-#include "Sema.h"
+#include "clang/Sema/SemaInternal.h"
+#include "clang/Sema/DelayedDiagnostic.h"
#include "TargetAttributesSema.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/APFloat.h"
+#include "clang/Sema/CXXFieldCollector.h"
#include "clang/Sema/ExternalSemaSource.h"
-#include "clang/AST/ASTConsumer.h"
+#include "clang/Sema/PrettyDeclStackTrace.h"
+#include "clang/Sema/Scope.h"
+#include "clang/Sema/ScopeInfo.h"
+#include "clang/Sema/SemaConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTDiagnostic.h"
+#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/PartialDiagnostic.h"
#include "clang/Basic/TargetInfo.h"
using namespace clang;
+using namespace sema;
FunctionScopeInfo::~FunctionScopeInfo() { }
void FunctionScopeInfo::Clear(unsigned NumErrors) {
- NeedsScopeChecking = false;
+ HasBranchProtectedScope = false;
+ HasBranchIntoScope = false;
+ HasIndirectGoto = false;
+
LabelMap.clear();
SwitchStack.clear();
Returns.clear();
@@ -40,13 +50,13 @@ void FunctionScopeInfo::Clear(unsigned NumErrors) {
BlockScopeInfo::~BlockScopeInfo() { }
-void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
+void Sema::ActOnTranslationUnitScope(Scope *S) {
TUScope = S;
PushDeclContext(S, Context.getTranslationUnitDecl());
VAListTagName = PP.getIdentifierInfo("__va_list_tag");
- if (!Context.isInt128Installed() && // May be set by PCHReader.
+ if (!Context.isInt128Installed() && // May be set by ASTReader.
PP.getTargetInfo().getPointerWidth(0) >= 64) {
TypeSourceInfo *TInfo;
@@ -68,7 +78,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
if (!PP.getLangOptions().ObjC1) return;
- // Built-in ObjC types may already be set by PCHReader (hence isNull checks).
+ // Built-in ObjC types may already be set by ASTReader (hence isNull checks).
if (Context.getObjCSelType().isNull()) {
// Create the built-in typedef for 'SEL'.
QualType SelT = Context.getPointerType(Context.ObjCBuiltinSelTy);
@@ -113,7 +123,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
PushOnScopeChains(ClassTypedef, TUScope);
Context.setObjCClassType(Context.getTypeDeclType(ClassTypedef));
Context.ObjCClassRedefinitionType = Context.getObjCClassType();
- }
+ }
}
Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
@@ -123,9 +133,8 @@ 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),
- PackContext(0), TopFunctionScope(0), ParsingDeclDepth(0),
- IdResolver(pp.getLangOptions()), StdNamespace(0), StdBadAlloc(0),
- GlobalNewDeleteDeclared(false),
+ PackContext(0), VisContext(0), ParsingDeclDepth(0),
+ IdResolver(pp.getLangOptions()), GlobalNewDeleteDeclared(false),
CompleteTranslationUnit(CompleteTranslationUnit),
NumSFINAEErrors(0), SuppressAccessChecking(false),
NonInstantiationEntries(0), CurrentInstantiationScope(0), TyposCorrected(0),
@@ -140,22 +149,52 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
&Context);
ExprEvalContexts.push_back(
- ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0));
+ ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0));
+
+ FunctionScopes.push_back(new FunctionScopeInfo(Diags.getNumErrors()));
+}
+
+void Sema::Initialize() {
+ // Tell the AST consumer about this Sema object.
+ Consumer.Initialize(Context);
+
+ // FIXME: Isn't this redundant with the initialization above?
+ if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
+ SC->InitializeSema(*this);
+
+ // Tell the external Sema source about this Sema object.
+ if (ExternalSemaSource *ExternalSema
+ = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
+ ExternalSema->InitializeSema(*this);
}
Sema::~Sema() {
if (PackContext) FreePackedContext();
+ if (VisContext) FreeVisContext();
delete TheTargetAttributesSema;
- while (!FunctionScopes.empty())
- PopFunctionOrBlockScope();
+
+ // Kill all the active scopes.
+ for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
+ delete FunctionScopes[I];
+ if (FunctionScopes.size() == 1)
+ delete FunctionScopes[0];
+
+ // Tell the SemaConsumer to forget about us; we're going out of scope.
+ if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
+ SC->ForgetSema();
+
+ // Detach from the external Sema source.
+ if (ExternalSemaSource *ExternalSema
+ = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
+ ExternalSema->ForgetSema();
}
/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
/// If there is already an implicit cast, merge into the existing one.
-/// If isLvalue, the result of the cast is an lvalue.
+/// The result is of the given category.
void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty,
- CastExpr::CastKind Kind,
- bool isLvalue, CXXBaseSpecifierArray BasePath) {
+ CastKind Kind, ExprValueKind VK,
+ const CXXCastPath *BasePath) {
QualType ExprTy = Context.getCanonicalType(Expr->getType());
QualType TypeTy = Context.getCanonicalType(Ty);
@@ -173,8 +212,8 @@ void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty,
// If this is a derived-to-base cast to a through a virtual base, we
// need a vtable.
- if (Kind == CastExpr::CK_DerivedToBase &&
- BasePathInvolvesVirtualBase(BasePath)) {
+ if (Kind == CK_DerivedToBase &&
+ BasePathInvolvesVirtualBase(*BasePath)) {
QualType T = Expr->getType();
if (const PointerType *Pointer = T->getAs<PointerType>())
T = Pointer->getPointeeType();
@@ -184,53 +223,96 @@ void Sema::ImpCastExprToType(Expr *&Expr, QualType Ty,
}
if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(Expr)) {
- if (ImpCast->getCastKind() == Kind && BasePath.empty()) {
+ if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
ImpCast->setType(Ty);
- ImpCast->setLvalueCast(isLvalue);
+ ImpCast->setValueKind(VK);
return;
}
}
- Expr = new (Context) ImplicitCastExpr(Ty, Kind, Expr, BasePath, isLvalue);
+ Expr = ImplicitCastExpr::Create(Context, Ty, Kind, Expr, BasePath, VK);
}
-void Sema::DeleteExpr(ExprTy *E) {
- if (E) static_cast<Expr*>(E)->Destroy(Context);
+ExprValueKind Sema::CastCategory(Expr *E) {
+ Expr::Classification Classification = E->Classify(Context);
+ return Classification.isRValue() ? VK_RValue :
+ (Classification.isLValue() ? VK_LValue : VK_XValue);
}
-void Sema::DeleteStmt(StmtTy *S) {
- if (S) static_cast<Stmt*>(S)->Destroy(Context);
+
+/// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
+static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
+ if (D->isUsed())
+ return true;
+
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+ // UnusedFileScopedDecls stores the first declaration.
+ // The declaration may have become definition so check again.
+ const FunctionDecl *DeclToCheck;
+ if (FD->hasBody(DeclToCheck))
+ return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
+
+ // Later redecls may add new information resulting in not having to warn,
+ // so check again.
+ DeclToCheck = FD->getMostRecentDeclaration();
+ if (DeclToCheck != FD)
+ return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
+ }
+
+ if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
+ // UnusedFileScopedDecls stores the first declaration.
+ // The declaration may have become definition so check again.
+ const VarDecl *DeclToCheck = VD->getDefinition();
+ if (DeclToCheck)
+ return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
+
+ // Later redecls may add new information resulting in not having to warn,
+ // so check again.
+ DeclToCheck = VD->getMostRecentDeclaration();
+ if (DeclToCheck != VD)
+ return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
+ }
+
+ return false;
}
/// ActOnEndOfTranslationUnit - This is called at the very end of the
/// translation unit when EOF is reached and all but the top-level scope is
/// popped.
-void Sema::ActOnEndOfTranslationUnit() {
- while (1) {
- // C++: Perform implicit template instantiations.
- //
- // FIXME: When we perform these implicit instantiations, we do not carefully
- // keep track of the point of instantiation (C++ [temp.point]). This means
- // that name lookup that occurs within the template instantiation will
- // always happen at the end of the translation unit, so it will find
- // some names that should not be found. Although this is common behavior
- // for C++ compilers, it is technically wrong. In the future, we either need
- // to be able to filter the results of name lookup or we need to perform
- // template instantiations earlier.
- PerformPendingImplicitInstantiations();
-
- /// If DefinedUsedVTables ends up marking any virtual member
- /// functions it might lead to more pending template
- /// instantiations, which is why we need to loop here.
- if (!DefineUsedVTables())
- break;
- }
+void Sema::ActOnEndOfTranslationUnit() {
+ // At PCH writing, implicit instantiations and VTable handling info are
+ // stored and performed when the PCH is included.
+ if (CompleteTranslationUnit)
+ while (1) {
+ // C++: Perform implicit template instantiations.
+ //
+ // FIXME: When we perform these implicit instantiations, we do not
+ // carefully keep track of the point of instantiation (C++ [temp.point]).
+ // This means that name lookup that occurs within the template
+ // instantiation will always happen at the end of the translation unit,
+ // so it will find some names that should not be found. Although this is
+ // common behavior for C++ compilers, it is technically wrong. In the
+ // future, we either need to be able to filter the results of name lookup
+ // or we need to perform template instantiations earlier.
+ PerformPendingInstantiations();
+
+ /// If DefinedUsedVTables ends up marking any virtual member
+ /// functions it might lead to more pending template
+ /// instantiations, which is why we need to loop here.
+ if (!DefineUsedVTables())
+ break;
+ }
- // Remove functions that turned out to be used.
- UnusedStaticFuncs.erase(std::remove_if(UnusedStaticFuncs.begin(),
- UnusedStaticFuncs.end(),
- std::bind2nd(std::mem_fun(&FunctionDecl::isUsed),
- true)),
- UnusedStaticFuncs.end());
+ // Remove file scoped decls that turned out to be used.
+ UnusedFileScopedDecls.erase(std::remove_if(UnusedFileScopedDecls.begin(),
+ UnusedFileScopedDecls.end(),
+ std::bind1st(std::ptr_fun(ShouldRemoveFromUnused),
+ this)),
+ UnusedFileScopedDecls.end());
+
+ if (!CompleteTranslationUnit) {
+ TUScope = 0;
+ return;
+ }
// Check for #pragma weak identifiers that were never declared
// FIXME: This will cause diagnostics to be emitted in a non-determinstic
@@ -244,9 +326,6 @@ void Sema::ActOnEndOfTranslationUnit() {
<< I->first;
}
- if (!CompleteTranslationUnit)
- return;
-
// C99 6.9.2p2:
// A declaration of an identifier for an object that has file
// scope without an initializer, and without a storage-class
@@ -293,14 +372,28 @@ void Sema::ActOnEndOfTranslationUnit() {
}
- // Output warning for unused functions.
- for (std::vector<FunctionDecl*>::iterator
- F = UnusedStaticFuncs.begin(),
- FEnd = UnusedStaticFuncs.end();
- F != FEnd;
- ++F)
- Diag((*F)->getLocation(), diag::warn_unused_function) << (*F)->getDeclName();
-
+ // Output warning for unused file scoped decls.
+ for (llvm::SmallVectorImpl<const DeclaratorDecl*>::iterator
+ I = UnusedFileScopedDecls.begin(),
+ E = UnusedFileScopedDecls.end(); I != E; ++I) {
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
+ const FunctionDecl *DiagD;
+ if (!FD->hasBody(DiagD))
+ DiagD = FD;
+ Diag(DiagD->getLocation(),
+ isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
+ : diag::warn_unused_function)
+ << DiagD->getDeclName();
+ } else {
+ const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
+ if (!DiagD)
+ DiagD = cast<VarDecl>(*I);
+ Diag(DiagD->getLocation(), diag::warn_unused_variable)
+ << DiagD->getDeclName();
+ }
+ }
+
+ TUScope = 0;
}
@@ -418,11 +511,11 @@ Scope *Sema::getScopeForContext(DeclContext *Ctx) {
/// \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);
+ if (FunctionScopes.size() == 1) {
+ // Use the "top" function scope rather than having to allocate
+ // memory for a new scope.
+ FunctionScopes.back()->Clear(getDiagnostics().getNumErrors());
+ FunctionScopes.push_back(FunctionScopes.back());
return;
}
@@ -436,21 +529,17 @@ void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
}
void Sema::PopFunctionOrBlockScope() {
- if (FunctionScopes.back() != &TopFunctionScope)
- delete FunctionScopes.back();
- else
- TopFunctionScope.Clear(getDiagnostics().getNumErrors());
-
- FunctionScopes.pop_back();
+ FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
+ assert(!FunctionScopes.empty() && "mismatched push/pop!");
+ if (FunctionScopes.back() != Scope)
+ delete Scope;
}
/// \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();
+ return getCurFunction()->NumErrorsAtStartOfFunction
+ != getDiagnostics().getNumErrors();
}
BlockScopeInfo *Sema::getCurBlock() {
@@ -462,3 +551,21 @@ BlockScopeInfo *Sema::getCurBlock() {
// Pin this vtable to this file.
ExternalSemaSource::~ExternalSemaSource() {}
+
+void PrettyDeclStackTraceEntry::print(llvm::raw_ostream &OS) const {
+ SourceLocation Loc = this->Loc;
+ if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
+ if (Loc.isValid()) {
+ Loc.print(OS, S.getSourceManager());
+ OS << ": ";
+ }
+ OS << Message;
+
+ if (TheDecl && isa<NamedDecl>(TheDecl)) {
+ std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
+ if (!Name.empty())
+ OS << " '" << Name << '\'';
+ }
+
+ OS << '\n';
+}
--
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