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Frontend: teach the compiler to use a backup directory to find .swiftinterface files to compile

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This mechanism allows the compiler to use a backup interface file to build into a binary module when
a corresponding interface file from the SDK is failing for whatever reasons. This mechansim should be entirely opaque
to end users except several diagnostic messages communicating backup interfaces are used.

Part of rdar://77676064
This commit is contained in:
Xi Ge
2021-05-10 16:31:58 -07:00
parent 7487c12d05
commit b6cd513534
20 changed files with 303 additions and 74 deletions
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37
lib/Serialization/SerializedModuleLoader.cpp
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@@ -973,6 +973,27 @@ bool swift::extractCompilerFlagsFromInterface(StringRef buffer,
return false;
}
llvm::VersionTuple
swift::extractUserModuleVersionFromInterface(StringRef moduleInterfacePath) {
llvm::VersionTuple result;
// Read the inteface file and extract its compiler arguments line
if (auto file = llvm::MemoryBuffer::getFile(moduleInterfacePath)) {
llvm::BumpPtrAllocator alloc;
llvm::StringSaver argSaver(alloc);
SmallVector<const char*, 8> args;
(void)extractCompilerFlagsFromInterface((*file)->getBuffer(), argSaver, args);
for (unsigned I = 0, N = args.size(); I + 1 < N; I++) {
// Check the version number specified via -user-module-version.
StringRef current(args[I]), next(args[I + 1]);
if (current == "-user-module-version") {
result.tryParse(next);
break;
}
}
}
return result;
}
bool SerializedModuleLoaderBase::canImportModule(
ImportPath::Element mID, llvm::VersionTuple version, bool underlyingVersion) {
// If underlying version is specified, this should be handled by Clang importer.
@@ -1009,21 +1030,7 @@ bool SerializedModuleLoaderBase::canImportModule(
assert(!underlyingVersion);
llvm::VersionTuple currentVersion;
if (!moduleInterfacePath.empty()) {
// Read the inteface file and extract its compiler arguments line
if (auto file = llvm::MemoryBuffer::getFile(moduleInterfacePath)) {
llvm::BumpPtrAllocator alloc;
llvm::StringSaver argSaver(alloc);
SmallVector<const char*, 8> args;
(void)extractCompilerFlagsFromInterface((*file)->getBuffer(), argSaver, args);
for (unsigned I = 0, N = args.size(); I + 1 < N; I++) {
// Check the version number specified via -user-module-version.
StringRef current(args[I]), next(args[I + 1]);
if (current == "-user-module-version") {
currentVersion.tryParse(next);
break;
}
}
}
currentVersion = extractUserModuleVersionFromInterface(moduleInterfacePath);
}
// If failing to extract the user version from the interface file, try the binary
// format, if present.