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//===- Scope.cpp - Lexical scope information --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Scope class, which is used for recording
// information about a lexical scope.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/Scope.h"
#include "clang/AST/Decl.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
void Scope::setFlags(Scope *parent, unsigned flags) {
AnyParent = parent;
Flags = flags;
if (parent && !(flags & FnScope)) {
BreakParent = parent->BreakParent;
ContinueParent = parent->ContinueParent;
} else {
// Control scopes do not contain the contents of nested function scopes for
// control flow purposes.
BreakParent = ContinueParent = nullptr;
}
if (parent) {
Depth = parent->Depth + 1;
PrototypeDepth = parent->PrototypeDepth;
PrototypeIndex = 0;
FnParent = parent->FnParent;
BlockParent = parent->BlockParent;
TemplateParamParent = parent->TemplateParamParent;
MSLastManglingParent = parent->MSLastManglingParent;
MSCurManglingNumber = getMSLastManglingNumber();
if ((Flags & (FnScope | ClassScope | BlockScope | TemplateParamScope |
FunctionPrototypeScope | AtCatchScope | ObjCMethodScope)) ==
0)
Flags |= parent->getFlags() & OpenMPSimdDirectiveScope;
} else {
Depth = 0;
PrototypeDepth = 0;
PrototypeIndex = 0;
MSLastManglingParent = FnParent = BlockParent = nullptr;
TemplateParamParent = nullptr;
MSLastManglingNumber = 1;
MSCurManglingNumber = 1;
}
// If this scope is a function or contains breaks/continues, remember it.
if (flags & FnScope) FnParent = this;
// The MS mangler uses the number of scopes that can hold declarations as
// part of an external name.
if (Flags & (ClassScope | FnScope)) {
MSLastManglingNumber = getMSLastManglingNumber();
MSLastManglingParent = this;
MSCurManglingNumber = 1;
}
if (flags & BreakScope) BreakParent = this;
if (flags & ContinueScope) ContinueParent = this;
if (flags & BlockScope) BlockParent = this;
if (flags & TemplateParamScope) TemplateParamParent = this;
// If this is a prototype scope, record that.
if (flags & FunctionPrototypeScope) PrototypeDepth++;
if (flags & DeclScope) {
if (flags & FunctionPrototypeScope)
; // Prototype scopes are uninteresting.
else if ((flags & ClassScope) && getParent()->isClassScope())
; // Nested class scopes aren't ambiguous.
else if ((flags & ClassScope) && getParent()->getFlags() == DeclScope)
; // Classes inside of namespaces aren't ambiguous.
else if ((flags & EnumScope))
; // Don't increment for enum scopes.
else
incrementMSManglingNumber();
}
}
void Scope::Init(Scope *parent, unsigned flags) {
setFlags(parent, flags);
DeclsInScope.clear();
UsingDirectives.clear();
Entity = nullptr;
ErrorTrap.reset();
NRVO.setPointerAndInt(nullptr, 0);
}
bool Scope::containedInPrototypeScope() const {
const Scope *S = this;
while (S) {
if (S->isFunctionPrototypeScope())
return true;
S = S->getParent();
}
return false;
}
void Scope::AddFlags(unsigned FlagsToSet) {
assert((FlagsToSet & ~(BreakScope | ContinueScope)) == 0 &&
"Unsupported scope flags");
if (FlagsToSet & BreakScope) {
assert((Flags & BreakScope) == 0 && "Already set");
BreakParent = this;
}
if (FlagsToSet & ContinueScope) {
assert((Flags & ContinueScope) == 0 && "Already set");
ContinueParent = this;
}
Flags |= FlagsToSet;
}
void Scope::mergeNRVOIntoParent() {
if (VarDecl *Candidate = NRVO.getPointer()) {
if (isDeclScope(Candidate))
Candidate->setNRVOVariable(true);
}
if (getEntity())
return;
if (NRVO.getInt())
getParent()->setNoNRVO();
else if (NRVO.getPointer())
getParent()->addNRVOCandidate(NRVO.getPointer());
}
LLVM_DUMP_METHOD void Scope::dump() const { dumpImpl(llvm::errs()); }
void Scope::dumpImpl(raw_ostream &OS) const {
unsigned Flags = getFlags();
bool HasFlags = Flags != 0;
if (HasFlags)
OS << "Flags: ";
while (Flags) {
if (Flags & FnScope) {
OS << "FnScope";
Flags &= ~FnScope;
} else if (Flags & BreakScope) {
OS << "BreakScope";
Flags &= ~BreakScope;
} else if (Flags & ContinueScope) {
OS << "ContinueScope";
Flags &= ~ContinueScope;
} else if (Flags & DeclScope) {
OS << "DeclScope";
Flags &= ~DeclScope;
} else if (Flags & ControlScope) {
OS << "ControlScope";
Flags &= ~ControlScope;
} else if (Flags & ClassScope) {
OS << "ClassScope";
Flags &= ~ClassScope;
} else if (Flags & BlockScope) {
OS << "BlockScope";
Flags &= ~BlockScope;
} else if (Flags & TemplateParamScope) {
OS << "TemplateParamScope";
Flags &= ~TemplateParamScope;
} else if (Flags & FunctionPrototypeScope) {
OS << "FunctionPrototypeScope";
Flags &= ~FunctionPrototypeScope;
} else if (Flags & FunctionDeclarationScope) {
OS << "FunctionDeclarationScope";
Flags &= ~FunctionDeclarationScope;
} else if (Flags & AtCatchScope) {
OS << "AtCatchScope";
Flags &= ~AtCatchScope;
} else if (Flags & ObjCMethodScope) {
OS << "ObjCMethodScope";
Flags &= ~ObjCMethodScope;
} else if (Flags & SwitchScope) {
OS << "SwitchScope";
Flags &= ~SwitchScope;
} else if (Flags & TryScope) {
OS << "TryScope";
Flags &= ~TryScope;
} else if (Flags & FnTryCatchScope) {
OS << "FnTryCatchScope";
Flags &= ~FnTryCatchScope;
} else if (Flags & SEHTryScope) {
OS << "SEHTryScope";
Flags &= ~SEHTryScope;
} else if (Flags & SEHExceptScope) {
OS << "SEHExceptScope";
Flags &= ~SEHExceptScope;
} else if (Flags & OpenMPDirectiveScope) {
OS << "OpenMPDirectiveScope";
Flags &= ~OpenMPDirectiveScope;
} else if (Flags & OpenMPLoopDirectiveScope) {
OS << "OpenMPLoopDirectiveScope";
Flags &= ~OpenMPLoopDirectiveScope;
} else if (Flags & OpenMPSimdDirectiveScope) {
OS << "OpenMPSimdDirectiveScope";
Flags &= ~OpenMPSimdDirectiveScope;
}
if (Flags)
OS << " | ";
}
if (HasFlags)
OS << '\n';
if (const Scope *Parent = getParent())
OS << "Parent: (clang::Scope*)" << Parent << '\n';
OS << "Depth: " << Depth << '\n';
OS << "MSLastManglingNumber: " << getMSLastManglingNumber() << '\n';
OS << "MSCurManglingNumber: " << getMSCurManglingNumber() << '\n';
if (const DeclContext *DC = getEntity())
OS << "Entity : (clang::DeclContext*)" << DC << '\n';
if (NRVO.getInt())
OS << "NRVO not allowed\n";
else if (NRVO.getPointer())
OS << "NRVO candidate : (clang::VarDecl*)" << NRVO.getPointer() << '\n';
}
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