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SerializeLoc: serialize basic decl source location information to .swiftsourceinfo file

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After setting up the .swiftsourceinfo file, this patch starts to actually serialize
and de-serialize source locations for declaration. The binary format of .swiftsourceinfo
currently contains these three records:

BasicDeclLocs: a hash table mapping from a USR ID to a list of basic source locations. The USR id
could be retrieved from the following DeclUSRs record using an actual decl USR. The basic source locations
include a file ID and the results from Decl::getLoc(), ValueDecl::getNameLoc(), Decl::getStartLoc() and Decl::getEndLoc().
The file ID could be used to retrieve the actual file name from the following SourceFilePaths record.
Each location is encoded as a line:column pair.

DeclUSRS: a hash table mapping from USR to a USR ID used by location records.

SourceFilePaths: a hash table mapping from a file ID to actual file name.

BasicDeclLocs should be sufficient for most diagnostic cases. If additional source locations
are needed, we could always add new source location records without breaking the backward compatibility.
When de-serializing the source location from a module-imported decl, we calculate its USR, retrieve the USR ID
from the DeclUSRS record, and use the USR ID to look up the basic location list in the BasicDeclLocs record.

For more details about .swiftsourceinfo file: https://forums.swift.org/t/proposal-emitting-source-information-file-during-compilation
This commit is contained in:
Xi Ge
2019-09-30 16:28:01 -07:00
parent 0587470a2b
commit e9dfdea6fd
22 changed files with 1167 additions and 136 deletions
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4
lib/Frontend/ModuleInterfaceLoader.cpp
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@@ -988,8 +988,10 @@ bool ModuleInterfaceLoader::isCached(StringRef DepPath) {
std::error_code ModuleInterfaceLoader::findModuleFilesInDirectory(
AccessPathElem ModuleID, StringRef DirPath, StringRef ModuleFilename,
StringRef ModuleDocFilename,
StringRef ModuleSourceInfoFilename,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer) {
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer) {
// If running in OnlySerialized mode, ModuleInterfaceLoader
// should not have been constructed at all.