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117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
//===--- CompactArray.cpp -------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "sourcekitd/CompactArray.h"
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#include "SourceKit/Core/LLVM.h"
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#include "SourceKit/Support/UIdent.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <limits.h>
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using namespace SourceKit;
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using namespace sourcekitd;
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template <typename T>
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static void addScalar(T Val, SmallVectorImpl<uint8_t> &Buf) {
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const uint8_t *ValPtr = reinterpret_cast<const uint8_t *>(&Val);
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Buf.append(ValPtr, ValPtr + sizeof(Val));
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}
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CompactArrayBuilderImpl::CompactArrayBuilderImpl() {
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// Offset 0 is used for empty strings.
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StringBuffer += '\0';
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}
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void CompactArrayBuilderImpl::addImpl(uint8_t Val) {
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addScalar(Val, EntriesBuffer);
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}
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void CompactArrayBuilderImpl::addImpl(unsigned Val) {
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addScalar(Val, EntriesBuffer);
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}
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void CompactArrayBuilderImpl::addImpl(StringRef Val) {
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addScalar(getOffsetForString(Val), EntriesBuffer);
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}
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void CompactArrayBuilderImpl::addImpl(UIdent Val) {
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sourcekitd_uid_t uid = SKDUIDFromUIdent(Val);
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addScalar(uid, EntriesBuffer);
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}
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void CompactArrayBuilderImpl::addImpl(Optional<llvm::StringRef> Val) {
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if (Val.hasValue()) {
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addImpl(Val.getValue());
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} else {
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addImpl(unsigned(-1));
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}
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}
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unsigned CompactArrayBuilderImpl::getOffsetForString(StringRef Str) {
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if (Str.empty())
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return 0;
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unsigned Offset = StringBuffer.size();
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StringBuffer += Str;
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StringBuffer += '\0';
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return Offset;
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}
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std::unique_ptr<llvm::MemoryBuffer>
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CompactArrayBuilderImpl::createBuffer() const {
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size_t EntriesBufSize = EntriesBuffer.size();
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std::unique_ptr<llvm::MemoryBuffer> Buf;
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Buf = llvm::MemoryBuffer::getNewUninitMemBuffer(
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sizeof(uint64_t) +
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EntriesBufSize +
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StringBuffer.size());
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char *BufPtr = (char*)Buf->getBufferStart();
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*reinterpret_cast<uint64_t*>(BufPtr) = EntriesBufSize;
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BufPtr += sizeof(uint64_t);
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memcpy(BufPtr, EntriesBuffer.data(), EntriesBufSize);
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BufPtr += EntriesBufSize;
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memcpy(BufPtr, StringBuffer.data(), StringBuffer.size());
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return Buf;
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}
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bool CompactArrayBuilderImpl::empty() const {
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return EntriesBuffer.empty();
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}
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template <typename T>
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static void readScalar(const uint8_t *Buf, T &Val) {
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memcpy(&Val, Buf, sizeof(Val));
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}
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void CompactArrayReaderImpl::readImpl(size_t Offset, uint8_t &Val) {
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readScalar(getEntriesBufStart() + Offset, Val);
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}
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void CompactArrayReaderImpl::readImpl(size_t Offset, unsigned &Val) {
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readScalar(getEntriesBufStart() + Offset, Val);
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}
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void CompactArrayReaderImpl::readImpl(size_t Offset, const char * &Val) {
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unsigned StrOffset;
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readScalar(getEntriesBufStart() + Offset, StrOffset);
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if (StrOffset == unsigned(-1)) {
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Val = nullptr;
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return;
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}
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Val = getStringBufStart() + StrOffset;
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}
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void CompactArrayReaderImpl::readImpl(size_t Offset, sourcekitd_uid_t &Val) {
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readScalar(getEntriesBufStart() + Offset, Val);
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}
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