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7000969f14
Align the grammar of macro declarations with SE-0382, so that macro
definitions are parsed as an expression. External macro definitions
are referenced via a referenced to the macro `#externalMacro`. Define
that macro in the standard library, and recognize uses of it as the
definition of other macros to use externally-defined macros. For
example, this means that the "stringify" macro used in a lot of
examples is now defined as something like this:
@expression macro stringify<T>(_ value: T) -> (T, String) =
#externalMacro(module: "MyMacros", type: "StringifyMacro")
We still parse the old "A.B" syntax for two reasons. First, it's
helpful to anyone who has existing code using the prior syntax, so they
get a warning + Fix-It to rewrite to the new syntax. Second, we use it
to define builtin macros like `externalMacro` itself, which looks like this:
@expression
public macro externalMacro<T>(module: String, type: String) -> T =
Builtin.ExternalMacro
This uses the same virtual `Builtin` module as other library builtins,
and we can expand it to handle other builtin macro implementations
(such as #line) over time.
21 lines
1.2 KiB
Swift
21 lines
1.2 KiB
Swift
// REQUIRES: asserts
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// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -typecheck -module-name Macros -emit-module-interface-path %t/Macros.swiftinterface -enable-experimental-feature Macros %s
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// RUN: %FileCheck %s < %t/Macros.swiftinterface --check-prefix CHECK
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// RUN: %target-swift-frontend -compile-module-from-interface %t/Macros.swiftinterface -o %t/Macros.swiftmodule
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// CHECK: #if compiler(>=5.3) && $Macros
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// CHECK-NEXT: @expression public macro publicStringify<T>(_ value: T) -> (T, Swift.String) = #externalMacro(module: "SomeModule", type: "StringifyMacro")
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// CHECK-NEXT: #endif
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@expression public macro publicStringify<T>(_ value: T) -> (T, String) = #externalMacro(module: "SomeModule", type: "StringifyMacro")
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// CHECK: #if compiler(>=5.3) && $Macros
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// CHECK: @expression public macro publicLine<T>: T = #externalMacro(module: "SomeModule", type: "Line") where T : Swift.ExpressibleByIntegerLiteral
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// CHECK-NEXT: #endif
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@expression public macro publicLine<T: ExpressibleByIntegerLiteral>: T = #externalMacro(module: "SomeModule", type: "Line")
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// CHECK-NOT: internalStringify
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@expression macro internalStringify<T>(_ value: T) -> (T, String) = #externalMacro(module: "SomeModule", type: "StringifyMacro")
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