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[ParseableInterface] Add ‘forwarding modules’

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A ‘forwarding module’ is a YAML file that’s meant to stand in for a .swiftmodule file and provide an up-to-date description of its dependencies, always using modification times.

When a ‘prebuilt module’ is first loaded, we verify that it’s up-to-date by hashing all of its dependencies. Since this is orders of magnitude slower than reading mtimes, we’ll install a `forwarding module` containing the mtimes of the now-validated dependencies.
This commit is contained in:
Harlan Haskins
2019-02-13 17:36:55 -08:00
parent 67a447f15f
commit 366bbf48b9
17 changed files with 1315 additions and 703 deletions
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4
test/ParseableInterface/ModuleCache/prebuilt-module-cache-recursive.swift
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@@ -9,7 +9,9 @@
// RUN: %empty-directory(%t/MCP)
// RUN: sed -e 's/FromInterface/FromPrebuilt/g' %S/Inputs/prebuilt-module-cache/Lib.swiftinterface | %target-swift-frontend -parse-stdlib -module-cache-path %t/MCP -emit-module-path %t/prebuilt-cache/Lib.swiftmodule - -module-name Lib
// RUN: not %target-swift-frontend -typecheck -enable-parseable-module-interface -parse-stdlib -module-cache-path %t/MCP -sdk %S/Inputs -I %S/Inputs/prebuilt-module-cache/ -prebuilt-module-cache-path %t/prebuilt-cache %s 2>&1 | %FileCheck -check-prefix=FROM-PREBUILT %s
// RUN: ls %t/MCP | grep -v LibExporter | not grep swiftmodule
// Make sure we installed a forwarding module.
// RUN: %{python} %S/Inputs/check-is-forwarding-module.py %t/MCP/Lib-*.swiftmodule
// What if the module is invalid?
// RUN: rm %t/prebuilt-cache/Lib.swiftmodule && touch %t/prebuilt-cache/Lib.swiftmodule