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c8ecd0ba25
Alternately, "add a system of ridiculous overkill for bitcode record layout", in the spirit of DRY over YAGNI. It /is/ much more concise than the LLVM way. Use this to emit a sketch of Clang's PCH control block, although nothing's in there yet besides "version 1.0" and the LLVM revision number; the latter is more "proof of concept" than actually useful. We should figure out a good way to identify trunk Swift compilers; this shouldn't be difficult. Swift SVN r5107
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
//===--- Serialization.cpp - Read and write Swift modules -----------------===//
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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 "swift/Serialization/Serialization.h"
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#include "swift/AST/AST.h"
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#include "swift/AST/Diagnostics.h"
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#include "swift/Serialization/BCRecordLayout.h"
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#include "swift/Subsystems.h"
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#include "llvm/Bitcode/BitstreamWriter.h"
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#include "llvm/Config/Config.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace swift;
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using namespace swift::serialization;
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namespace {
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class Serializer {
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SmallVector<char, 0> Buffer;
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llvm::BitstreamWriter Out;
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/// A reusable buffer for emitting records.
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SmallVector<uint64_t, 64> ScratchRecord;
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/// Writes the Swift module file header and BLOCKINFO block.
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void writeHeader();
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/// Top-level entry point for serializing a translation unit module.
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void writeTranslationUnit(const TranslationUnit *TU);
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public:
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Serializer() : Out(Buffer) {}
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/// Serialize a translation unit to the given stream.
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void writeToStream(const TranslationUnit *TU, raw_ostream &os);
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};
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} // end anonymous namespace
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void Serializer::writeHeader() {
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// Swift module file type: 'SMod'.
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Out.Emit((unsigned)'S', 8);
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Out.Emit((unsigned)'M', 8);
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Out.Emit((unsigned)'o', 8);
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Out.Emit((unsigned)'d', 8);
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{
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BCBlockRAII restoreBlock(Out, llvm::bitc::BLOCKINFO_BLOCK_ID, 2);
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}
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{
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BCBlockRAII restoreBlock(Out, CONTROL_BLOCK_ID, 3);
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BCRecordLayout<
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BCLiteral<METADATA>, // ID
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BCFixed<16>, // Module format major version
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BCFixed<16>, // Module format minor version
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BCBlob // misc. version information
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> Metadata(Out);
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// FIXME: put a real version in here.
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#ifdef LLVM_VERSION_INFO
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# define EXTRA_VERSION_STRING PACKAGE_STRING LLVM_VERSION_INFO
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#else
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# define EXTRA_VERSION_STRING PACKAGE_STRING
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#endif
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Metadata.emit(ScratchRecord,
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METADATA, VERSION_MAJOR, VERSION_MINOR, EXTRA_VERSION_STRING);
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#undef EXTRA_VERSION_STRING
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}
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}
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void Serializer::writeTranslationUnit(const TranslationUnit *TU) {
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(void)TU;
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}
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void Serializer::writeToStream(const TranslationUnit *TU, raw_ostream &os) {
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writeHeader();
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writeTranslationUnit(TU);
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os.write(Buffer.data(), Buffer.size());
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os.flush();
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Buffer.clear();
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}
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void swift::serialize(const TranslationUnit *TU, const char *outputPath) {
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std::string errorInfo;
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llvm::raw_fd_ostream out(outputPath, errorInfo,
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llvm::raw_fd_ostream::F_Binary);
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if (out.has_error() || !errorInfo.empty()) {
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TU->Ctx.Diags.diagnose(SourceLoc(), diag::error_opening_output, outputPath,
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errorInfo);
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out.clear_error();
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return;
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}
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Serializer S;
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S.writeToStream(TU, out);
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}
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