428 lines
13 KiB
C++
428 lines
13 KiB
C++
//===- IdentifierResolver.cpp - Lexical Scope Name lookup -----------------===//
|
|
//
|
|
// 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 IdentifierResolver class, which is used for lexical
|
|
// scoped lookup, based on declaration names.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "clang/Sema/IdentifierResolver.h"
|
|
#include "clang/AST/Decl.h"
|
|
#include "clang/AST/DeclBase.h"
|
|
#include "clang/AST/DeclarationName.h"
|
|
#include "clang/Basic/IdentifierTable.h"
|
|
#include "clang/Basic/LangOptions.h"
|
|
#include "clang/Lex/ExternalPreprocessorSource.h"
|
|
#include "clang/Lex/Preprocessor.h"
|
|
#include "clang/Sema/Scope.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include <cassert>
|
|
#include <cstdint>
|
|
|
|
using namespace clang;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// IdDeclInfoMap class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// IdDeclInfoMap - Associates IdDeclInfos with declaration names.
|
|
/// Allocates 'pools' (vectors of IdDeclInfos) to avoid allocating each
|
|
/// individual IdDeclInfo to heap.
|
|
class IdentifierResolver::IdDeclInfoMap {
|
|
static const unsigned int POOL_SIZE = 512;
|
|
|
|
/// We use our own linked-list implementation because it is sadly
|
|
/// impossible to add something to a pre-C++0x STL container without
|
|
/// a completely unnecessary copy.
|
|
struct IdDeclInfoPool {
|
|
IdDeclInfoPool *Next;
|
|
IdDeclInfo Pool[POOL_SIZE];
|
|
|
|
IdDeclInfoPool(IdDeclInfoPool *Next) : Next(Next) {}
|
|
};
|
|
|
|
IdDeclInfoPool *CurPool = nullptr;
|
|
unsigned int CurIndex = POOL_SIZE;
|
|
|
|
public:
|
|
IdDeclInfoMap() = default;
|
|
|
|
~IdDeclInfoMap() {
|
|
IdDeclInfoPool *Cur = CurPool;
|
|
while (IdDeclInfoPool *P = Cur) {
|
|
Cur = Cur->Next;
|
|
delete P;
|
|
}
|
|
}
|
|
|
|
/// Returns the IdDeclInfo associated to the DeclarationName.
|
|
/// It creates a new IdDeclInfo if one was not created before for this id.
|
|
IdDeclInfo &operator[](DeclarationName Name);
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// IdDeclInfo Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// RemoveDecl - Remove the decl from the scope chain.
|
|
/// The decl must already be part of the decl chain.
|
|
void IdentifierResolver::IdDeclInfo::RemoveDecl(NamedDecl *D) {
|
|
for (DeclsTy::iterator I = Decls.end(); I != Decls.begin(); --I) {
|
|
if (D == *(I-1)) {
|
|
Decls.erase(I-1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
llvm_unreachable("Didn't find this decl on its identifier's chain!");
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// IdentifierResolver Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
IdentifierResolver::IdentifierResolver(Preprocessor &PP)
|
|
: LangOpt(PP.getLangOpts()), PP(PP), IdDeclInfos(new IdDeclInfoMap) {}
|
|
|
|
IdentifierResolver::~IdentifierResolver() {
|
|
delete IdDeclInfos;
|
|
}
|
|
|
|
/// isDeclInScope - If 'Ctx' is a function/method, isDeclInScope returns true
|
|
/// if 'D' is in Scope 'S', otherwise 'S' is ignored and isDeclInScope returns
|
|
/// true if 'D' belongs to the given declaration context.
|
|
bool IdentifierResolver::isDeclInScope(Decl *D, DeclContext *Ctx, Scope *S,
|
|
bool AllowInlineNamespace) const {
|
|
Ctx = Ctx->getRedeclContext();
|
|
|
|
if (Ctx->isFunctionOrMethod() || (S && S->isFunctionPrototypeScope())) {
|
|
// Ignore the scopes associated within transparent declaration contexts.
|
|
while (S->getEntity() && S->getEntity()->isTransparentContext())
|
|
S = S->getParent();
|
|
|
|
if (S->isDeclScope(D))
|
|
return true;
|
|
if (LangOpt.CPlusPlus) {
|
|
// C++ 3.3.2p3:
|
|
// The name declared in a catch exception-declaration is local to the
|
|
// handler and shall not be redeclared in the outermost block of the
|
|
// handler.
|
|
// C++ 3.3.2p4:
|
|
// Names declared in the for-init-statement, and in the condition of if,
|
|
// while, for, and switch statements are local to the if, while, for, or
|
|
// switch statement (including the controlled statement), and shall not be
|
|
// redeclared in a subsequent condition of that statement nor in the
|
|
// outermost block (or, for the if statement, any of the outermost blocks)
|
|
// of the controlled statement.
|
|
//
|
|
assert(S->getParent() && "No TUScope?");
|
|
if (S->getParent()->getFlags() & Scope::ControlScope) {
|
|
S = S->getParent();
|
|
if (S->isDeclScope(D))
|
|
return true;
|
|
}
|
|
if (S->getFlags() & Scope::FnTryCatchScope)
|
|
return S->getParent()->isDeclScope(D);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// FIXME: If D is a local extern declaration, this check doesn't make sense;
|
|
// we should be checking its lexical context instead in that case, because
|
|
// that is its scope.
|
|
DeclContext *DCtx = D->getDeclContext()->getRedeclContext();
|
|
return AllowInlineNamespace ? Ctx->InEnclosingNamespaceSetOf(DCtx)
|
|
: Ctx->Equals(DCtx);
|
|
}
|
|
|
|
/// AddDecl - Link the decl to its shadowed decl chain.
|
|
void IdentifierResolver::AddDecl(NamedDecl *D) {
|
|
DeclarationName Name = D->getDeclName();
|
|
if (IdentifierInfo *II = Name.getAsIdentifierInfo())
|
|
updatingIdentifier(*II);
|
|
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
|
|
if (!Ptr) {
|
|
Name.setFETokenInfo(D);
|
|
return;
|
|
}
|
|
|
|
IdDeclInfo *IDI;
|
|
|
|
if (isDeclPtr(Ptr)) {
|
|
Name.setFETokenInfo(nullptr);
|
|
IDI = &(*IdDeclInfos)[Name];
|
|
NamedDecl *PrevD = static_cast<NamedDecl*>(Ptr);
|
|
IDI->AddDecl(PrevD);
|
|
} else
|
|
IDI = toIdDeclInfo(Ptr);
|
|
|
|
IDI->AddDecl(D);
|
|
}
|
|
|
|
void IdentifierResolver::InsertDeclAfter(iterator Pos, NamedDecl *D) {
|
|
DeclarationName Name = D->getDeclName();
|
|
if (IdentifierInfo *II = Name.getAsIdentifierInfo())
|
|
updatingIdentifier(*II);
|
|
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
|
|
if (!Ptr) {
|
|
AddDecl(D);
|
|
return;
|
|
}
|
|
|
|
if (isDeclPtr(Ptr)) {
|
|
// We only have a single declaration: insert before or after it,
|
|
// as appropriate.
|
|
if (Pos == iterator()) {
|
|
// Add the new declaration before the existing declaration.
|
|
NamedDecl *PrevD = static_cast<NamedDecl*>(Ptr);
|
|
RemoveDecl(PrevD);
|
|
AddDecl(D);
|
|
AddDecl(PrevD);
|
|
} else {
|
|
// Add new declaration after the existing declaration.
|
|
AddDecl(D);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// General case: insert the declaration at the appropriate point in the
|
|
// list, which already has at least two elements.
|
|
IdDeclInfo *IDI = toIdDeclInfo(Ptr);
|
|
if (Pos.isIterator()) {
|
|
IDI->InsertDecl(Pos.getIterator() + 1, D);
|
|
} else
|
|
IDI->InsertDecl(IDI->decls_begin(), D);
|
|
}
|
|
|
|
/// RemoveDecl - Unlink the decl from its shadowed decl chain.
|
|
/// The decl must already be part of the decl chain.
|
|
void IdentifierResolver::RemoveDecl(NamedDecl *D) {
|
|
assert(D && "null param passed");
|
|
DeclarationName Name = D->getDeclName();
|
|
if (IdentifierInfo *II = Name.getAsIdentifierInfo())
|
|
updatingIdentifier(*II);
|
|
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
|
|
assert(Ptr && "Didn't find this decl on its identifier's chain!");
|
|
|
|
if (isDeclPtr(Ptr)) {
|
|
assert(D == Ptr && "Didn't find this decl on its identifier's chain!");
|
|
Name.setFETokenInfo(nullptr);
|
|
return;
|
|
}
|
|
|
|
return toIdDeclInfo(Ptr)->RemoveDecl(D);
|
|
}
|
|
|
|
/// begin - Returns an iterator for decls with name 'Name'.
|
|
IdentifierResolver::iterator
|
|
IdentifierResolver::begin(DeclarationName Name) {
|
|
if (IdentifierInfo *II = Name.getAsIdentifierInfo())
|
|
readingIdentifier(*II);
|
|
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
if (!Ptr) return end();
|
|
|
|
if (isDeclPtr(Ptr))
|
|
return iterator(static_cast<NamedDecl*>(Ptr));
|
|
|
|
IdDeclInfo *IDI = toIdDeclInfo(Ptr);
|
|
|
|
IdDeclInfo::DeclsTy::iterator I = IDI->decls_end();
|
|
if (I != IDI->decls_begin())
|
|
return iterator(I-1);
|
|
// No decls found.
|
|
return end();
|
|
}
|
|
|
|
namespace {
|
|
|
|
enum DeclMatchKind {
|
|
DMK_Different,
|
|
DMK_Replace,
|
|
DMK_Ignore
|
|
};
|
|
|
|
} // namespace
|
|
|
|
/// Compare two declarations to see whether they are different or,
|
|
/// if they are the same, whether the new declaration should replace the
|
|
/// existing declaration.
|
|
static DeclMatchKind compareDeclarations(NamedDecl *Existing, NamedDecl *New) {
|
|
// If the declarations are identical, ignore the new one.
|
|
if (Existing == New)
|
|
return DMK_Ignore;
|
|
|
|
// If the declarations have different kinds, they're obviously different.
|
|
if (Existing->getKind() != New->getKind())
|
|
return DMK_Different;
|
|
|
|
// If the declarations are redeclarations of each other, keep the newest one.
|
|
if (Existing->getCanonicalDecl() == New->getCanonicalDecl()) {
|
|
// If we're adding an imported declaration, don't replace another imported
|
|
// declaration.
|
|
if (Existing->isFromASTFile() && New->isFromASTFile())
|
|
return DMK_Different;
|
|
|
|
// If either of these is the most recent declaration, use it.
|
|
Decl *MostRecent = Existing->getMostRecentDecl();
|
|
if (Existing == MostRecent)
|
|
return DMK_Ignore;
|
|
|
|
if (New == MostRecent)
|
|
return DMK_Replace;
|
|
|
|
// If the existing declaration is somewhere in the previous declaration
|
|
// chain of the new declaration, then prefer the new declaration.
|
|
for (auto RD : New->redecls()) {
|
|
if (RD == Existing)
|
|
return DMK_Replace;
|
|
|
|
if (RD->isCanonicalDecl())
|
|
break;
|
|
}
|
|
|
|
return DMK_Ignore;
|
|
}
|
|
|
|
return DMK_Different;
|
|
}
|
|
|
|
bool IdentifierResolver::tryAddTopLevelDecl(NamedDecl *D, DeclarationName Name){
|
|
if (IdentifierInfo *II = Name.getAsIdentifierInfo())
|
|
readingIdentifier(*II);
|
|
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
|
|
if (!Ptr) {
|
|
Name.setFETokenInfo(D);
|
|
return true;
|
|
}
|
|
|
|
IdDeclInfo *IDI;
|
|
|
|
if (isDeclPtr(Ptr)) {
|
|
NamedDecl *PrevD = static_cast<NamedDecl*>(Ptr);
|
|
|
|
switch (compareDeclarations(PrevD, D)) {
|
|
case DMK_Different:
|
|
break;
|
|
|
|
case DMK_Ignore:
|
|
return false;
|
|
|
|
case DMK_Replace:
|
|
Name.setFETokenInfo(D);
|
|
return true;
|
|
}
|
|
|
|
Name.setFETokenInfo(nullptr);
|
|
IDI = &(*IdDeclInfos)[Name];
|
|
|
|
// If the existing declaration is not visible in translation unit scope,
|
|
// then add the new top-level declaration first.
|
|
if (!PrevD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
|
|
IDI->AddDecl(D);
|
|
IDI->AddDecl(PrevD);
|
|
} else {
|
|
IDI->AddDecl(PrevD);
|
|
IDI->AddDecl(D);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
IDI = toIdDeclInfo(Ptr);
|
|
|
|
// See whether this declaration is identical to any existing declarations.
|
|
// If not, find the right place to insert it.
|
|
for (IdDeclInfo::DeclsTy::iterator I = IDI->decls_begin(),
|
|
IEnd = IDI->decls_end();
|
|
I != IEnd; ++I) {
|
|
|
|
switch (compareDeclarations(*I, D)) {
|
|
case DMK_Different:
|
|
break;
|
|
|
|
case DMK_Ignore:
|
|
return false;
|
|
|
|
case DMK_Replace:
|
|
*I = D;
|
|
return true;
|
|
}
|
|
|
|
if (!(*I)->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
|
|
// We've found a declaration that is not visible from the translation
|
|
// unit (it's in an inner scope). Insert our declaration here.
|
|
IDI->InsertDecl(I, D);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Add the declaration to the end.
|
|
IDI->AddDecl(D);
|
|
return true;
|
|
}
|
|
|
|
void IdentifierResolver::readingIdentifier(IdentifierInfo &II) {
|
|
if (II.isOutOfDate())
|
|
PP.getExternalSource()->updateOutOfDateIdentifier(II);
|
|
}
|
|
|
|
void IdentifierResolver::updatingIdentifier(IdentifierInfo &II) {
|
|
if (II.isOutOfDate())
|
|
PP.getExternalSource()->updateOutOfDateIdentifier(II);
|
|
|
|
if (II.isFromAST())
|
|
II.setFETokenInfoChangedSinceDeserialization();
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// IdDeclInfoMap Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// Returns the IdDeclInfo associated to the DeclarationName.
|
|
/// It creates a new IdDeclInfo if one was not created before for this id.
|
|
IdentifierResolver::IdDeclInfo &
|
|
IdentifierResolver::IdDeclInfoMap::operator[](DeclarationName Name) {
|
|
void *Ptr = Name.getFETokenInfo<void>();
|
|
|
|
if (Ptr) return *toIdDeclInfo(Ptr);
|
|
|
|
if (CurIndex == POOL_SIZE) {
|
|
CurPool = new IdDeclInfoPool(CurPool);
|
|
CurIndex = 0;
|
|
}
|
|
IdDeclInfo *IDI = &CurPool->Pool[CurIndex];
|
|
Name.setFETokenInfo(reinterpret_cast<void*>(
|
|
reinterpret_cast<uintptr_t>(IDI) | 0x1)
|
|
);
|
|
++CurIndex;
|
|
return *IDI;
|
|
}
|
|
|
|
void IdentifierResolver::iterator::incrementSlowCase() {
|
|
NamedDecl *D = **this;
|
|
void *InfoPtr = D->getDeclName().getFETokenInfo<void>();
|
|
assert(!isDeclPtr(InfoPtr) && "Decl with wrong id ?");
|
|
IdDeclInfo *Info = toIdDeclInfo(InfoPtr);
|
|
|
|
BaseIter I = getIterator();
|
|
if (I != Info->decls_begin())
|
|
*this = iterator(I-1);
|
|
else // No more decls.
|
|
*this = iterator();
|
|
}
|