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//===-- DeclContextInternals.h - DeclContext Representation -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the data structures used in the implementation
// of DeclContext.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_DECLCONTEXTINTERNALS_H
#define LLVM_CLANG_AST_DECLCONTEXTINTERNALS_H
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclarationName.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallVector.h"
#include <algorithm>
namespace clang {
/// StoredDeclsList - This is an array of decls optimized a common case of only
/// containing one entry.
struct StoredDeclsList {
/// The kind of data encoded in this list.
enum DataKind {
/// \brief The data is a NamedDecl*.
DK_Decl = 0,
/// \brief The data is a declaration ID (an unsigned value),
/// shifted left by 2 bits.
DK_DeclID = 1,
/// \brief The data is a pointer to a vector (of type VectorTy)
/// that contains declarations.
DK_Decl_Vector = 2,
/// \brief The data is a pointer to a vector (of type VectorTy)
/// that contains declaration ID.
DK_ID_Vector = 3
};
/// VectorTy - When in vector form, this is what the Data pointer points to.
typedef llvm::SmallVector<uintptr_t, 4> VectorTy;
/// \brief The stored data, which will be either a declaration ID, a
/// pointer to a NamedDecl, or a pointer to a vector.
uintptr_t Data;
public:
StoredDeclsList() : Data(0) {}
StoredDeclsList(const StoredDeclsList &RHS) : Data(RHS.Data) {
if (VectorTy *RHSVec = RHS.getAsVector()) {
VectorTy *New = new VectorTy(*RHSVec);
Data = reinterpret_cast<uintptr_t>(New) | (Data & 0x03);
}
}
~StoredDeclsList() {
// If this is a vector-form, free the vector.
if (VectorTy *Vector = getAsVector())
delete Vector;
}
StoredDeclsList &operator=(const StoredDeclsList &RHS) {
if (VectorTy *Vector = getAsVector())
delete Vector;
Data = RHS.Data;
if (VectorTy *RHSVec = RHS.getAsVector()) {
VectorTy *New = new VectorTy(*RHSVec);
Data = reinterpret_cast<uintptr_t>(New) | (Data & 0x03);
}
return *this;
}
bool isNull() const { return (Data & ~0x03) == 0; }
NamedDecl *getAsDecl() const {
if ((Data & 0x03) != DK_Decl)
return 0;
return reinterpret_cast<NamedDecl *>(Data & ~0x03);
}
VectorTy *getAsVector() const {
if ((Data & 0x03) != DK_ID_Vector && (Data & 0x03) != DK_Decl_Vector)
return 0;
return reinterpret_cast<VectorTy *>(Data & ~0x03);
}
void setOnlyValue(NamedDecl *ND) {
assert(!getAsVector() && "Not inline");
Data = reinterpret_cast<uintptr_t>(ND);
}
void setFromDeclIDs(const llvm::SmallVectorImpl<unsigned> &Vec) {
if (Vec.size() > 1) {
VectorTy *Vector = getAsVector();
if (!Vector) {
Vector = new VectorTy;
Data = reinterpret_cast<uintptr_t>(Vector) | DK_ID_Vector;
}
Vector->resize(Vec.size());
std::copy(Vec.begin(), Vec.end(), Vector->begin());
return;
}
if (VectorTy *Vector = getAsVector())
delete Vector;
if (Vec.empty())
Data = 0;
else
Data = (Vec[0] << 2) | DK_DeclID;
}
/// \brief Force the stored declarations list to contain actual
/// declarations.
///
/// This routine will resolve any declaration IDs for declarations
/// that may not yet have been loaded from external storage.
void materializeDecls(ASTContext &Context);
bool hasDeclarationIDs() const {
DataKind DK = (DataKind)(Data & 0x03);
return DK == DK_DeclID || DK == DK_ID_Vector;
}
/// getLookupResult - Return an array of all the decls that this list
/// represents.
DeclContext::lookup_result getLookupResult(ASTContext &Context) {
if (isNull())
return DeclContext::lookup_result(0, 0);
if (hasDeclarationIDs())
materializeDecls(Context);
// If we have a single NamedDecl, return it.
if (getAsDecl()) {
assert(!isNull() && "Empty list isn't allowed");
// Data is a raw pointer to a NamedDecl*, return it.
void *Ptr = &Data;
return DeclContext::lookup_result((NamedDecl**)Ptr, (NamedDecl**)Ptr+1);
}
assert(getAsVector() && "Must have a vector at this point");
VectorTy &Vector = *getAsVector();
// Otherwise, we have a range result.
return DeclContext::lookup_result((NamedDecl **)&Vector[0],
(NamedDecl **)&Vector[0]+Vector.size());
}
/// HandleRedeclaration - If this is a redeclaration of an existing decl,
/// replace the old one with D and return true. Otherwise return false.
bool HandleRedeclaration(ASTContext &Context, NamedDecl *D) {
if (hasDeclarationIDs())
materializeDecls(Context);
// Most decls only have one entry in their list, special case it.
if (NamedDecl *OldD = getAsDecl()) {
if (!D->declarationReplaces(OldD))
return false;
setOnlyValue(D);
return true;
}
// Determine if this declaration is actually a redeclaration.
VectorTy &Vec = *getAsVector();
for (VectorTy::iterator OD = Vec.begin(), ODEnd = Vec.end();
OD != ODEnd; ++OD) {
NamedDecl *OldD = reinterpret_cast<NamedDecl *>(*OD);
if (D->declarationReplaces(OldD)) {
*OD = reinterpret_cast<uintptr_t>(D);
return true;
}
}
return false;
}
/// AddSubsequentDecl - This is called on the second and later decl when it is
/// not a redeclaration to merge it into the appropriate place in our list.
///
void AddSubsequentDecl(NamedDecl *D) {
assert(!hasDeclarationIDs() && "Must materialize before adding decls");
// If this is the second decl added to the list, convert this to vector
// form.
if (NamedDecl *OldD = getAsDecl()) {
VectorTy *VT = new VectorTy();
VT->push_back(reinterpret_cast<uintptr_t>(OldD));
Data = reinterpret_cast<uintptr_t>(VT) | DK_Decl_Vector;
}
VectorTy &Vec = *getAsVector();
if (isa<UsingDirectiveDecl>(D) ||
D->getIdentifierNamespace() == Decl::IDNS_Tag)
Vec.push_back(reinterpret_cast<uintptr_t>(D));
else if (reinterpret_cast<NamedDecl *>(Vec.back())
->getIdentifierNamespace() == Decl::IDNS_Tag) {
uintptr_t TagD = Vec.back();
Vec.back() = reinterpret_cast<uintptr_t>(D);
Vec.push_back(TagD);
} else
Vec.push_back(reinterpret_cast<uintptr_t>(D));
}
};
typedef llvm::DenseMap<DeclarationName, StoredDeclsList> StoredDeclsMap;
} // end namespace clang
#endif
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