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ModuleLoader: teach canImport to check Swift user module versions

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For config condition `canImport(Foo, version: N)`, this patch teaches the compiler to check N
against the version of the Swift module Foo on disk. It returns true if the module version on
disk is greater or equal to N and returns false otherwise.

Part of rdar://73992299
This commit is contained in:
Xi Ge
2021-05-03 11:41:20 -07:00
parent 1bdf006b1f
commit 8fa2e8a03d
7 changed files with 165 additions and 27 deletions
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13
include/swift/Serialization/SerializedModuleLoader.h
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@@ -250,7 +250,13 @@ public:
/// Imports serialized Swift modules from a MemoryBuffer into an ASTContext.
/// This interface is primarily used by LLDB.
class MemoryBufferSerializedModuleLoader : public SerializedModuleLoaderBase {
llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> MemoryBuffers;
struct MemoryBufferInfo {
std::unique_ptr<llvm::MemoryBuffer> buffer;
llvm::VersionTuple userVersion;
};
llvm::StringMap<MemoryBufferInfo> MemoryBuffers;
MemoryBufferSerializedModuleLoader(ASTContext &ctx,
DependencyTracker *tracker,
@@ -289,8 +295,9 @@ public:
///
/// FIXME: make this an actual import *path* once submodules are designed.
void registerMemoryBuffer(StringRef importPath,
std::unique_ptr<llvm::MemoryBuffer> input) {
MemoryBuffers[importPath] = std::move(input);
std::unique_ptr<llvm::MemoryBuffer> input,
llvm::VersionTuple version) {
MemoryBuffers[importPath] = {std::move(input), version};
}
void collectVisibleTopLevelModuleNames(