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https://github.com/apple/swift.git
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Doug Gregor
c24a4c399e
`%target-embedded-link` now bundles `libswiftCore.a` (and `libswiftEmbeddedPlatformPOSIX.a` when available), so RUN lines that spell out `%target-embedded-posix-shim` or `%embedded-stdlib` alongside it are redundant. Also switch `concurrency-dynamic-isolation-link.swift` from raw `%target-clang` to `%target-embedded-link` so it picks up the stdlib archive through the same substitution.
57 lines
1.9 KiB
Swift
57 lines
1.9 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -parse-as-library -enable-experimental-feature Extern -enable-experimental-feature Embedded -wmo %s -c -o %t/main.o
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// RUN: %target-embedded-link %target-clang-resource-dir-opt %t/main.o -o %t/a.out -dead_strip
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// RUN: %target-run %t/a.out | %FileCheck %s
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// REQUIRES: executable_test
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// REQUIRES: optimized_stdlib
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// REQUIRES: OS=macosx || OS=linux-gnu
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// REQUIRES: swift_feature_Embedded
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// REQUIRES: swift_feature_Extern
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// Bind to libc's `vprintf` directly. Use @_extern(c) rather than
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// @_silgen_name so the call uses the C calling convention: on aarch64
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// Linux, CVaListPointer is a 32-byte struct that AAPCS64 requires to be
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// passed by hidden pointer, and Swift's default convention doesn't match.
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@_extern(c)
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func vprintf(_ fmt: UnsafePointer<CChar>, _ va: CVaListPointer) -> CInt
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// A Swift wrapper that takes CVarArg values and forwards them into vprintf.
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func swiftPrintf(_ fmt: StaticString, _ args: CVarArg...) {
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fmt.withUTF8Buffer { buf in
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buf.baseAddress!.withMemoryRebound(to: CChar.self, capacity: buf.count) { cfmt in
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_ = withVaList(args) { va in vprintf(cfmt, va) }
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}
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}
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}
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@main
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struct Main {
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static func main() {
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// 1. Forwarded through a Swift CVarArg... wrapper.
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swiftPrintf("[wrapper] %d + %d = %d\n", 40 as Int32, 2 as Int32, 42 as Int32)
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// CHECK: [wrapper] 40 + 2 = 42
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// 2. Direct withVaList on a [CVarArg] literal.
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_ = withVaList([1.5 as Double, 2.5 as Double]) { va in
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"[direct] %g and %g\n".withCString { fmt in
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vprintf(fmt, va)
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}
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}
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// CHECK: [direct] 1.5 and 2.5
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// 3. Mixed types, including a string pointer.
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"hello".withCString { s in
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_ = withVaList([Int32(3), OpaquePointer(s)]) { va in
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"[mixed] count=%d str=%s\n".withCString { fmt in
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vprintf(fmt, va)
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}
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}
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}
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// CHECK: [mixed] count=3 str=hello
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print("done")
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// CHECK: done
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}
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}
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