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[Index] Prevent re-indexing system modules repeatedly

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If a module was first read using the adjacent swiftmodule and then
reloaded using the swiftinterface, we would do an up to date check on
the adjacent module but write out the unit using the swiftinterface.
This would cause the same modules to be indexed repeatedly for the first
invocation using a new SDK. On the next run we would instead raad the
swiftmodule from the cache and thus the out of date check would match
up.

The impact of this varies depending on the size of the module graph in
the initial compilation and the number of jobs started at the same time.
Each SDK dependency is re-indexed *and* reloaded, which is a drain on
both CPU and memory. Thus, if many jobs are initially started and
they're all going down this path, it can cause the system to run out of
memory very quickly.

Resolves rdar://103119964.
This commit is contained in:
Ben Barham
2023-02-02 17:23:38 -08:00
parent 9401926304
commit 6269643b4d
18 changed files with 393 additions and 251 deletions
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29
include/swift/Frontend/ModuleInterfaceLoader.h
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@@ -138,6 +138,7 @@ class ExplicitSwiftModuleLoader: public SerializedModuleLoaderBase {
bool findModule(ImportPath::Element moduleID,
SmallVectorImpl<char> *moduleInterfacePath,
SmallVectorImpl<char> *moduleInterfaceSourcePath,
std::unique_ptr<llvm::MemoryBuffer> *moduleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *moduleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *moduleSourceInfoBuffer,
@@ -145,13 +146,13 @@ class ExplicitSwiftModuleLoader: public SerializedModuleLoaderBase {
bool &isSystemModule) override;
std::error_code findModuleFilesInDirectory(
ImportPath::Element ModuleID,
const SerializedModuleBaseName &BaseName,
SmallVectorImpl<char> *ModuleInterfacePath,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
bool skipBuildingInterface, bool IsFramework) override;
ImportPath::Element ModuleID, const SerializedModuleBaseName &BaseName,
SmallVectorImpl<char> *ModuleInterfacePath,
SmallVectorImpl<char> *ModuleInterfaceSourcePath,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
bool skipBuildingInterface, bool IsFramework) override;
bool canImportModule(ImportPath::Module named,
ModuleVersionInfo *versionInfo) override;
@@ -418,13 +419,13 @@ class ModuleInterfaceLoader : public SerializedModuleLoaderBase {
ArrayRef<std::string> PreferInterfaceForModules;
std::error_code findModuleFilesInDirectory(
ImportPath::Element ModuleID,
const SerializedModuleBaseName &BaseName,
SmallVectorImpl<char> *ModuleInterfacePath,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
bool skipBuildingInterface, bool IsFramework) override;
ImportPath::Element ModuleID, const SerializedModuleBaseName &BaseName,
SmallVectorImpl<char> *ModuleInterfacePath,
SmallVectorImpl<char> *ModuleInterfaceSourcePath,
std::unique_ptr<llvm::MemoryBuffer> *ModuleBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleDocBuffer,
std::unique_ptr<llvm::MemoryBuffer> *ModuleSourceInfoBuffer,
bool skipBuildingInterface, bool IsFramework) override;
bool isCached(StringRef DepPath) override;
public: