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121 lines
4.1 KiB
C++
121 lines
4.1 KiB
C++
//===-- TestModuleFileExtension.cpp - Module Extension Tester -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "TestModuleFileExtension.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Serialization/ASTReader.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/Bitcode/BitstreamWriter.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdio>
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using namespace clang;
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using namespace clang::serialization;
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TestModuleFileExtension::Writer::~Writer() { }
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void TestModuleFileExtension::Writer::writeExtensionContents(
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Sema &SemaRef,
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llvm::BitstreamWriter &Stream) {
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using namespace llvm;
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// Write an abbreviation for this record.
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auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
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Abv->Add(BitCodeAbbrevOp(FIRST_EXTENSION_RECORD_ID));
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Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of characters
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Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // message
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auto Abbrev = Stream.EmitAbbrev(std::move(Abv));
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// Write a message into the extension block.
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SmallString<64> Message;
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{
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auto Ext = static_cast<TestModuleFileExtension *>(getExtension());
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raw_svector_ostream OS(Message);
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OS << "Hello from " << Ext->BlockName << " v" << Ext->MajorVersion << "."
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<< Ext->MinorVersion;
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}
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uint64_t Record[] = {FIRST_EXTENSION_RECORD_ID, Message.size()};
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Stream.EmitRecordWithBlob(Abbrev, Record, Message);
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}
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TestModuleFileExtension::Reader::Reader(ModuleFileExtension *Ext,
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const llvm::BitstreamCursor &InStream)
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: ModuleFileExtensionReader(Ext), Stream(InStream)
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{
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// Read the extension block.
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SmallVector<uint64_t, 4> Record;
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while (true) {
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llvm::BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
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switch (Entry.Kind) {
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case llvm::BitstreamEntry::SubBlock:
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case llvm::BitstreamEntry::EndBlock:
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case llvm::BitstreamEntry::Error:
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return;
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case llvm::BitstreamEntry::Record:
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break;
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}
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Record.clear();
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StringRef Blob;
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unsigned RecCode = Stream.readRecord(Entry.ID, Record, &Blob);
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switch (RecCode) {
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case FIRST_EXTENSION_RECORD_ID: {
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StringRef Message = Blob.substr(0, Record[0]);
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fprintf(stderr, "Read extension block message: %s\n",
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Message.str().c_str());
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break;
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}
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}
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}
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}
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TestModuleFileExtension::Reader::~Reader() { }
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TestModuleFileExtension::~TestModuleFileExtension() { }
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ModuleFileExtensionMetadata
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TestModuleFileExtension::getExtensionMetadata() const {
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return { BlockName, MajorVersion, MinorVersion, UserInfo };
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}
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llvm::hash_code TestModuleFileExtension::hashExtension(
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llvm::hash_code Code) const {
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if (Hashed) {
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Code = llvm::hash_combine(Code, BlockName);
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Code = llvm::hash_combine(Code, MajorVersion);
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Code = llvm::hash_combine(Code, MinorVersion);
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Code = llvm::hash_combine(Code, UserInfo);
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}
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return Code;
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}
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std::unique_ptr<ModuleFileExtensionWriter>
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TestModuleFileExtension::createExtensionWriter(ASTWriter &) {
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return std::unique_ptr<ModuleFileExtensionWriter>(new Writer(this));
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}
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std::unique_ptr<ModuleFileExtensionReader>
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TestModuleFileExtension::createExtensionReader(
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const ModuleFileExtensionMetadata &Metadata,
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ASTReader &Reader, serialization::ModuleFile &Mod,
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const llvm::BitstreamCursor &Stream)
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{
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assert(Metadata.BlockName == BlockName && "Wrong block name");
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if (std::make_pair(Metadata.MajorVersion, Metadata.MinorVersion) !=
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std::make_pair(MajorVersion, MinorVersion)) {
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Reader.getDiags().Report(Mod.ImportLoc,
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diag::err_test_module_file_extension_version)
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<< BlockName << Metadata.MajorVersion << Metadata.MinorVersion
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<< MajorVersion << MinorVersion;
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return nullptr;
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}
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return std::unique_ptr<ModuleFileExtensionReader>(
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new TestModuleFileExtension::Reader(this, Stream));
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}
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