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//======- ParsedAttr.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the ParsedAttr class implementation
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/ParsedAttr.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/AttrSubjectMatchRules.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include <cassert>
#include <cstddef>
#include <utility>
using namespace clang;
IdentifierLoc *IdentifierLoc::create(ASTContext &Ctx, SourceLocation Loc,
IdentifierInfo *Ident) {
IdentifierLoc *Result = new (Ctx) IdentifierLoc;
Result->Loc = Loc;
Result->Ident = Ident;
return Result;
}
size_t ParsedAttr::allocated_size() const {
if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
else if (IsTypeTagForDatatype)
return AttributeFactory::TypeTagForDatatypeAllocSize;
else if (IsProperty)
return AttributeFactory::PropertyAllocSize;
else if (HasParsedType)
return totalSizeToAlloc<ArgsUnion, detail::AvailabilityData,
detail::TypeTagForDatatypeData, ParsedType,
detail::PropertyData>(0, 0, 0, 1, 0);
return totalSizeToAlloc<ArgsUnion, detail::AvailabilityData,
detail::TypeTagForDatatypeData, ParsedType,
detail::PropertyData>(NumArgs, 0, 0, 0, 0);
}
AttributeFactory::AttributeFactory() {
// Go ahead and configure all the inline capacity. This is just a memset.
FreeLists.resize(InlineFreeListsCapacity);
}
AttributeFactory::~AttributeFactory() = default;
static size_t getFreeListIndexForSize(size_t size) {
assert(size >= sizeof(ParsedAttr));
assert((size % sizeof(void*)) == 0);
return ((size - sizeof(ParsedAttr)) / sizeof(void *));
}
void *AttributeFactory::allocate(size_t size) {
// Check for a previously reclaimed attribute.
size_t index = getFreeListIndexForSize(size);
if (index < FreeLists.size() && !FreeLists[index].empty()) {
ParsedAttr *attr = FreeLists[index].back();
FreeLists[index].pop_back();
return attr;
}
// Otherwise, allocate something new.
return Alloc.Allocate(size, alignof(AttributeFactory));
}
void AttributeFactory::deallocate(ParsedAttr *Attr) {
size_t size = Attr->allocated_size();
size_t freeListIndex = getFreeListIndexForSize(size);
// Expand FreeLists to the appropriate size, if required.
if (freeListIndex >= FreeLists.size())
FreeLists.resize(freeListIndex + 1);
#ifndef NDEBUG
// In debug mode, zero out the attribute to help find memory overwriting.
memset(Attr, 0, size);
#endif
// Add 'Attr' to the appropriate free-list.
FreeLists[freeListIndex].push_back(Attr);
}
void AttributeFactory::reclaimPool(AttributePool &cur) {
for (ParsedAttr *AL : cur.Attrs)
deallocate(AL);
}
void AttributePool::takePool(AttributePool &pool) {
Attrs.insert(Attrs.end(), pool.Attrs.begin(), pool.Attrs.end());
pool.Attrs.clear();
}
struct ParsedAttrInfo {
unsigned NumArgs : 4;
unsigned OptArgs : 4;
unsigned HasCustomParsing : 1;
unsigned IsTargetSpecific : 1;
unsigned IsType : 1;
unsigned IsStmt : 1;
unsigned IsKnownToGCC : 1;
unsigned IsSupportedByPragmaAttribute : 1;
bool (*DiagAppertainsToDecl)(Sema &S, const ParsedAttr &Attr, const Decl *);
bool (*DiagLangOpts)(Sema &S, const ParsedAttr &Attr);
bool (*ExistsInTarget)(const TargetInfo &Target);
unsigned (*SpellingIndexToSemanticSpelling)(const ParsedAttr &Attr);
void (*GetPragmaAttributeMatchRules)(
llvm::SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &Rules,
const LangOptions &LangOpts);
};
namespace {
#include "clang/Sema/AttrParsedAttrImpl.inc"
} // namespace
static const ParsedAttrInfo &getInfo(const ParsedAttr &A) {
return AttrInfoMap[A.getKind()];
}
unsigned ParsedAttr::getMinArgs() const { return getInfo(*this).NumArgs; }
unsigned ParsedAttr::getMaxArgs() const {
return getMinArgs() + getInfo(*this).OptArgs;
}
bool ParsedAttr::hasCustomParsing() const {
return getInfo(*this).HasCustomParsing;
}
bool ParsedAttr::diagnoseAppertainsTo(Sema &S, const Decl *D) const {
return getInfo(*this).DiagAppertainsToDecl(S, *this, D);
}
bool ParsedAttr::appliesToDecl(const Decl *D,
attr::SubjectMatchRule MatchRule) const {
return checkAttributeMatchRuleAppliesTo(D, MatchRule);
}
void ParsedAttr::getMatchRules(
const LangOptions &LangOpts,
SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &MatchRules)
const {
return getInfo(*this).GetPragmaAttributeMatchRules(MatchRules, LangOpts);
}
bool ParsedAttr::diagnoseLangOpts(Sema &S) const {
return getInfo(*this).DiagLangOpts(S, *this);
}
bool ParsedAttr::isTargetSpecificAttr() const {
return getInfo(*this).IsTargetSpecific;
}
bool ParsedAttr::isTypeAttr() const { return getInfo(*this).IsType; }
bool ParsedAttr::isStmtAttr() const { return getInfo(*this).IsStmt; }
bool ParsedAttr::existsInTarget(const TargetInfo &Target) const {
return getInfo(*this).ExistsInTarget(Target);
}
bool ParsedAttr::isKnownToGCC() const { return getInfo(*this).IsKnownToGCC; }
bool ParsedAttr::isSupportedByPragmaAttribute() const {
return getInfo(*this).IsSupportedByPragmaAttribute;
}
unsigned ParsedAttr::getSemanticSpelling() const {
return getInfo(*this).SpellingIndexToSemanticSpelling(*this);
}
bool ParsedAttr::hasVariadicArg() const {
// If the attribute has the maximum number of optional arguments, we will
// claim that as being variadic. If we someday get an attribute that
// legitimately bumps up against that maximum, we can use another bit to track
// whether it's truly variadic or not.
return getInfo(*this).OptArgs == 15;
}
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