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Frontend: teach the compiler to use a backup directory to find .swiftinterface files to compile

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This mechanism allows the compiler to use a backup interface file to build into a binary module when
a corresponding interface file from the SDK is failing for whatever reasons. This mechansim should be entirely opaque
to end users except several diagnostic messages communicating backup interfaces are used.

Part of rdar://77676064
This commit is contained in:
Xi Ge
2021-05-10 16:31:58 -07:00
parent 7487c12d05
commit b6cd513534
20 changed files with 303 additions and 74 deletions
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38
test/ModuleInterface/build-alternative-interface.swift Normal file
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// RUN: %empty-directory(%t)
// RUN: %empty-directory(%t/sources)
// RUN: %empty-directory(%t/inputs)
// RUN: %empty-directory(%t/alternative-inputs)
// RUN: %empty-directory(%t/module-cache)
// RUN: echo "public func foo() {}" > %t/sources/Foo.swift
// RUN: %target-swift-frontend-typecheck -emit-module-interface-path %t/inputs/Foo.swiftinterface %t/sources/Foo.swift -module-name Foo -disable-implicit-concurrency-module-import -enable-library-evolution -module-cache-path %t/module-cache -I %t/inputs -swift-version 5
// RUN: cp %t/inputs/Foo.swiftinterface %t/alternative-inputs/Foo.swiftinterface
// RUN: echo "import Foo" > %t/sources/Bar.swift
// RUN: echo "public func foo() {}" >> %t/sources/Bar.swift
// RUN: %target-swift-frontend-typecheck -emit-module-interface-path %t/inputs/Bar.swiftinterface %t/sources/Bar.swift -module-name Bar -disable-implicit-concurrency-module-import -enable-library-evolution -module-cache-path %t/module-cache -I %t/inputs -swift-version 5
// RUN: cp %t/inputs/Bar.swiftinterface %t/alternative-inputs/Bar.swiftinterface
// RUN: echo "import Bar" > %t/sources/FooBar.swift
// RUN: echo "public func foo() {}" >> %t/sources/FooBar.swift
// RUN: %target-swift-frontend-typecheck -emit-module-interface-path %t/inputs/FooBar.swiftinterface %t/sources/FooBar.swift -module-name FooBar -disable-implicit-concurrency-module-import -enable-library-evolution -module-cache-path %t/module-cache -I %t/inputs -swift-version 5
// RUN: echo "messmessmess" >> %t/inputs/Foo.swiftinterface
// RUN: echo "messmessmess" >> %t/inputs/Bar.swiftinterface
// RUN: %target-typecheck-verify-swift -disable-implicit-concurrency-module-import -I %t/inputs -backup-module-interface-path %t/alternative-inputs -module-cache-path %t/module-cache
// RUN: touch %t/inputs/Bar.swiftinterface
// RUN: %target-swift-frontend-typecheck -disable-implicit-concurrency-module-import -I %t/inputs -backup-module-interface-path %t/alternative-inputs -module-cache-path %t/module-cache -Rmodule-interface-rebuild %s &> %t/remarks.txt
// RUN: %FileCheck --input-file %t/remarks.txt %s --check-prefix=CHECK-REBUILD
// CHECK-REBUILD: remark: rebuilding module 'FooBar' from interface
// CHECK-REBUILD: remark: rebuilding module 'Bar' from interface
// RUN: %target-swift-frontend-typecheck -disable-implicit-concurrency-module-import -I %t/inputs -backup-module-interface-path %t/alternative-inputs -module-cache-path %t/module-cache -Rmodule-interface-rebuild %s &> %t/no-remarks.txt
// RUN: echo "additional" >> %t/no-remarks.txt
// RUN: %FileCheck --input-file %t/no-remarks.txt %s --check-prefix=CHECK-REBUILD-NOT
// CHECK-REBUILD-NOT-NOT: remark
import FooBar
import Foo
import Bar