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serialization: obfuscate the serialized search paths

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We noticed some Swift clients rely on the serialized search paths in the module to
find dependencies and droping these paths altogether can lead to build failures like
rdar://85840921.

This change teaches the serialization to obfuscate the search paths and the deserialization
to recover them. This allows clients to keep accessing these paths without exposing
them when shipping the module to other users.
This commit is contained in:
Xi Ge
2021-11-30 18:52:21 -08:00
parent f00f2841ab
commit 0047d81f9a
21 changed files with 139 additions and 27 deletions
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5
include/swift/Frontend/FrontendOptions.h
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@@ -15,6 +15,7 @@
#include "swift/Basic/FileTypes.h"
#include "swift/Basic/Version.h"
#include "swift/Basic/PathRemapper.h"
#include "swift/Frontend/FrontendInputsAndOutputs.h"
#include "swift/Frontend/InputFile.h"
#include "llvm/ADT/Hashing.h"
@@ -437,6 +438,10 @@ public:
/// Whether to include symbols with SPI information in the symbol graph.
bool IncludeSPISymbolsInSymbolGraph = false;
/// This is used to obfuscate the serialized search paths so we don't have
/// to encode the actual paths into the .swiftmodule file.
PathObfuscator serializedPathObfuscator;
private:
static bool canActionEmitDependencies(ActionType);
static bool canActionEmitReferenceDependencies(ActionType);