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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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46
test/ParseableInterface/ModuleCache/prebuilt-module-cache-forwarding.swift Normal file
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// RUN: %empty-directory(%t)
// RUN: %empty-directory(%t/MCP)
// RUN: %empty-directory(%t/prebuilt-cache)
// First, prebuild a module and put it in the prebuilt cache.
// RUN: sed -e 's/FromInterface/FromPrebuilt/g' %S/Inputs/prebuilt-module-cache/Lib.swiftinterface > %t/Lib.swiftinterface
// RUN: %target-swift-frontend -build-module-from-parseable-interface -module-cache-path %t/MCP -serialize-parseable-module-interface-dependency-hashes -o %t/prebuilt-cache/Lib.swiftmodule %t/Lib.swiftinterface
// Next, use the module and check if the forwarding module is in place.
// 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
// Make sure we installed a forwarding module.
// RUN: %{python} %S/Inputs/check-is-forwarding-module.py %t/MCP/Lib-*.swiftmodule
// Now invalidate a dependency of the prebuilt module, and make sure the forwarding file is replaced with a real module.
// RUN: touch %t/Lib.swiftinterface
// 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-INTERFACE %s
// Delete the cached module we just created, and create the forwarding module again
// RUN: %empty-directory(%t/MCP)
// 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
// Move the prebuilt module out of the way, so the forwarding module points to nothing.
// RUN: mv %t/prebuilt-cache/Lib.swiftmodule %t/prebuilt-cache/NotLib.swiftmodule
// Make sure we delete the existing forwarding module and rebuild from an interface.
// 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-INTERFACE %s
// Move the prebuilt module back to its original path
// RUN: mv %t/prebuilt-cache/NotLib.swiftmodule %t/prebuilt-cache/Lib.swiftmodule
// If the forwarding module is corrupted, we shouldn't rebuild the module in the cache,
// we should delete it and generate a new forwarding module.
// RUN: %empty-directory(%t/MCP)
// 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
// RUN: %{python} %S/Inputs/check-is-forwarding-module.py %t/MCP/Lib-*.swiftmodule
// RUN: chmod a-r %t/MCP/Lib-*.swiftmodule
// 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: %{python} %S/Inputs/check-is-forwarding-module.py %t/MCP/Lib-*.swiftmodule
import Lib
struct X {}
let _: X = Lib.testValue
// FROM-INTERFACE: [[@LINE-1]]:16: error: cannot convert value of type 'FromInterface' to specified type 'X'
// FROM-PREBUILT: [[@LINE-2]]:16: error: cannot convert value of type 'FromPrebuilt' to specified type 'X'