mirror of
https://github.com/apple/swift.git
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5ef93af269
This reverts commit 3cc2831608.
The compiler's revision check has been relaxed since the feature was introduced
and so it's nos better to reduce the number of special code paths for LLDB in
the compiler to facilitate reasoning about it.
rdar://117824367
119 lines
4.1 KiB
C++
119 lines
4.1 KiB
C++
//===--- ASTSectionImporter.cpp - Import AST Section 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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements support for loading modules serialized into a
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// Mach-O AST section into Swift.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/ASTSectionImporter/ASTSectionImporter.h"
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#include "../Serialization/ModuleFormat.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/Serialization/SerializedModuleLoader.h"
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#include "swift/Serialization/Validation.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace swift;
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std::string ASTSectionParseError::toString() const {
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std::string S;
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llvm::raw_string_ostream SS(S);
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SS << serialization::StatusToString(Error);
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if (!ErrorMessage.empty())
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SS << ": " << ErrorMessage;
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return SS.str();
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}
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void ASTSectionParseError::log(raw_ostream &OS) const { OS << toString(); }
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std::error_code ASTSectionParseError::convertToErrorCode() const {
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llvm_unreachable("Function not implemented.");
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}
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char ASTSectionParseError::ID;
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llvm::Expected<SmallVector<std::string, 4>>
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swift::parseASTSection(MemoryBufferSerializedModuleLoader &Loader,
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StringRef buf,
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const llvm::Triple &filter) {
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if (!serialization::isSerializedAST(buf))
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return llvm::make_error<ASTSectionParseError>(
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serialization::Status::Malformed);
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SmallVector<std::string, 4> foundModules;
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bool haveFilter = filter.getOS() != llvm::Triple::UnknownOS &&
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filter.getArch() != llvm::Triple::UnknownArch;
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// An AST section consists of one or more AST modules, optionally with
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// headers. Iterate over all AST modules.
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while (!buf.empty()) {
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auto info = serialization::validateSerializedAST(
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buf, Loader.isRequiredOSSAModules(), /*requiredSDK*/StringRef());
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assert(info.name.size() < (2 << 10) && "name failed sanity check");
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std::string error;
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llvm::raw_string_ostream errs(error);
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if (info.status == serialization::Status::Valid) {
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assert(info.bytes != 0);
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bool selected = true;
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if (haveFilter) {
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llvm::Triple moduleTriple(info.targetTriple);
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selected = serialization::areCompatible(moduleTriple, filter);
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}
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if (!info.name.empty() && selected) {
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StringRef moduleData = buf.substr(0, info.bytes);
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std::unique_ptr<llvm::MemoryBuffer> bitstream(
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llvm::MemoryBuffer::getMemBuffer(moduleData, info.name, false));
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// Register the memory buffer.
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Loader.registerMemoryBuffer(info.name, std::move(bitstream),
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info.userModuleVersion);
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foundModules.push_back(info.name.str());
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}
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} else {
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errs << "Unable to load module";
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if (!info.name.empty())
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errs << " '" << info.name << '\'';
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errs << ".";
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}
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if (info.bytes == 0)
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return llvm::make_error<ASTSectionParseError>(info.status, errs.str());
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if (info.bytes > buf.size()) {
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errs << "AST section too small.";
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return llvm::make_error<ASTSectionParseError>(
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serialization::Status::Malformed, errs.str());
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}
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buf = buf.substr(
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llvm::alignTo(info.bytes, swift::serialization::SWIFTMODULE_ALIGNMENT));
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}
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return foundModules;
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}
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bool swift::parseASTSection(MemoryBufferSerializedModuleLoader &Loader,
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StringRef buf,
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const llvm::Triple &filter,
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SmallVectorImpl<std::string> &foundModules) {
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auto Result = parseASTSection(Loader, buf, filter);
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if (auto E = Result.takeError()) {
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llvm::dbgs() << toString(std::move(E));
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return false;
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}
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for (auto m : *Result)
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foundModules.push_back(m);
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return true;
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}
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