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Add in-source rationale for why Placeholder dependencies are needed.

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This commit is contained in:
Artem Chikin
2020-07-22 09:52:14 -07:00
parent 746e89b252
commit 965ca698d5
7 changed files with 107 additions and 89 deletions
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64
lib/Frontend/ModuleInterfaceLoader.cpp
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@@ -1530,70 +1530,6 @@ struct ExplicitSwiftModuleLoader::Implementation {
}
};
StringRef ExplicitModuleMapParser::getScalaNodeText(llvm::yaml::Node *N) {
SmallString<32> Buffer;
return Saver.save(cast<llvm::yaml::ScalarNode>(N)->getValue(Buffer));
}
bool ExplicitModuleMapParser::parseSingleModuleEntry(
llvm::yaml::Node &node, llvm::StringMap<ExplicitModuleInfo> &moduleMap) {
using namespace llvm::yaml;
auto *mapNode = dyn_cast<MappingNode>(&node);
if (!mapNode)
return true;
StringRef moduleName;
ExplicitModuleInfo result;
for (auto &entry : *mapNode) {
auto key = getScalaNodeText(entry.getKey());
auto val = getScalaNodeText(entry.getValue());
if (key == "moduleName") {
moduleName = val;
} else if (key == "modulePath") {
result.modulePath = val;
} else if (key == "docPath") {
result.moduleDocPath = val;
} else if (key == "sourceInfoPath") {
result.moduleSourceInfoPath = val;
} else {
// Being forgiving for future fields.
continue;
}
}
if (moduleName.empty())
return true;
moduleMap[moduleName] = std::move(result);
return false;
}
std::error_code ExplicitModuleMapParser::parseSwiftExplicitModuleMap(
const StringRef fileName, llvm::StringMap<ExplicitModuleInfo> &moduleMap) {
using namespace llvm::yaml;
// Load the input file.
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileBufOrErr =
llvm::MemoryBuffer::getFile(fileName);
if (!fileBufOrErr) {
return std::make_error_code(std::errc::no_such_file_or_directory);
}
StringRef Buffer = fileBufOrErr->get()->getBuffer();
// Use a new source manager instead of the one from ASTContext because we
// don't want the JSON file to be persistent.
llvm::SourceMgr SM;
Stream Stream(llvm::MemoryBufferRef(Buffer, fileName), SM);
for (auto DI = Stream.begin(); DI != Stream.end(); ++DI) {
assert(DI != Stream.end() && "Failed to read a document");
if (auto *MN = dyn_cast_or_null<SequenceNode>(DI->getRoot())) {
for (auto &entry : *MN) {
if (parseSingleModuleEntry(entry, moduleMap)) {
return std::make_error_code(std::errc::invalid_argument);
}
}
} else {
return std::make_error_code(std::errc::invalid_argument);
}
}
return std::error_code{}; // success
}
ExplicitSwiftModuleLoader::ExplicitSwiftModuleLoader(
ASTContext &ctx,
DependencyTracker *tracker,