forked from OSchip/llvm-project
128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
//===--- AttributeList.cpp --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the AttributeList class implementation
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/AttributeList.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Expr.h"
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#include "clang/Basic/IdentifierTable.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringSwitch.h"
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using namespace clang;
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size_t AttributeList::allocated_size() const {
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if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
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else if (IsTypeTagForDatatype)
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return AttributeFactory::TypeTagForDatatypeAllocSize;
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return (sizeof(AttributeList) + NumArgs * sizeof(Expr*));
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}
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AttributeFactory::AttributeFactory() {
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// Go ahead and configure all the inline capacity. This is just a memset.
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FreeLists.resize(InlineFreeListsCapacity);
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}
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AttributeFactory::~AttributeFactory() {}
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static size_t getFreeListIndexForSize(size_t size) {
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assert(size >= sizeof(AttributeList));
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assert((size % sizeof(void*)) == 0);
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return ((size - sizeof(AttributeList)) / sizeof(void*));
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}
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void *AttributeFactory::allocate(size_t size) {
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// Check for a previously reclaimed attribute.
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size_t index = getFreeListIndexForSize(size);
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if (index < FreeLists.size()) {
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if (AttributeList *attr = FreeLists[index]) {
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FreeLists[index] = attr->NextInPool;
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return attr;
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}
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}
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// Otherwise, allocate something new.
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return Alloc.Allocate(size, llvm::AlignOf<AttributeFactory>::Alignment);
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}
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void AttributeFactory::reclaimPool(AttributeList *cur) {
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assert(cur && "reclaiming empty pool!");
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do {
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// Read this here, because we're going to overwrite NextInPool
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// when we toss 'cur' into the appropriate queue.
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AttributeList *next = cur->NextInPool;
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size_t size = cur->allocated_size();
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size_t freeListIndex = getFreeListIndexForSize(size);
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// Expand FreeLists to the appropriate size, if required.
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if (freeListIndex >= FreeLists.size())
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FreeLists.resize(freeListIndex+1);
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// Add 'cur' to the appropriate free-list.
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cur->NextInPool = FreeLists[freeListIndex];
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FreeLists[freeListIndex] = cur;
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cur = next;
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} while (cur);
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}
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void AttributePool::takePool(AttributeList *pool) {
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assert(pool);
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// Fast path: this pool is empty.
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if (!Head) {
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Head = pool;
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return;
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}
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// Reverse the pool onto the current head. This optimizes for the
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// pattern of pulling a lot of pools into a single pool.
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do {
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AttributeList *next = pool->NextInPool;
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pool->NextInPool = Head;
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Head = pool;
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pool = next;
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} while (pool);
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}
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AttributeList *
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AttributePool::createIntegerAttribute(ASTContext &C, IdentifierInfo *Name,
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SourceLocation TokLoc, int Arg) {
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Expr *IArg = IntegerLiteral::Create(C, llvm::APInt(32, (uint64_t) Arg),
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C.IntTy, TokLoc);
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return create(Name, TokLoc, 0, TokLoc, 0, TokLoc, &IArg, 1,
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AttributeList::AS_GNU);
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}
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#include "clang/Sema/AttrParsedAttrKinds.inc"
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AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name,
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const IdentifierInfo *ScopeName,
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Syntax SyntaxUsed) {
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StringRef AttrName = Name->getName();
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// Normalize the attribute name, __foo__ becomes foo.
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if (AttrName.startswith("__") && AttrName.endswith("__") &&
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AttrName.size() >= 4)
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AttrName = AttrName.substr(2, AttrName.size() - 4);
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SmallString<64> Buf;
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if (ScopeName)
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Buf += ScopeName->getName();
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// Ensure that in the case of C++11 attributes, we look for '::foo' if it is
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// unscoped.
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if (ScopeName || SyntaxUsed == AS_CXX11)
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Buf += "::";
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Buf += AttrName;
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return ::getAttrKind(Buf);
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}
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