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51d5d7bbae
One of the main user of these kind of coroutines is swift. There yield-once (`retcon.once`) coroutines are used to temporary "expose" pointers to internal fields of various objects creating borrow scopes. However, in some cases it might be useful also to allow these coroutines to produce a normal result, but there is no convenient way to represent this (as compared to switched-resume kind of coroutines where C++ `co_return` is transformed to a member / callback call on promise object). The extension is simple: we allow continuation function to have a non-void result and accept optional extra arguments via a special `llvm.coro.end.result` intrinsic that would essentially forward them as normal results.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc18.0.0 -fcoroutines -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
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void *myAlloc(long long);
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// CHECK-LABEL: f(
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void f(int n) {
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// CHECK: %n.addr = alloca i32
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// CHECK: %promise = alloca i32
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int promise;
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// CHECK: %[[COROID:.+]] = call token @llvm.coro.id(i32 32, ptr %promise, ptr null, ptr null)
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__builtin_coro_id(32, &promise, 0, 0);
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// CHECK-NEXT: call i1 @llvm.coro.alloc(token %[[COROID]])
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__builtin_coro_alloc();
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// CHECK-NEXT: call ptr @llvm.coro.noop()
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__builtin_coro_noop();
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// CHECK-NEXT: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
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// CHECK-NEXT: %[[MEM:.+]] = call ptr @myAlloc(i64 noundef %[[SIZE]])
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// CHECK-NEXT: %[[FRAME:.+]] = call ptr @llvm.coro.begin(token %[[COROID]], ptr %[[MEM]])
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__builtin_coro_begin(myAlloc(__builtin_coro_size()));
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// CHECK-NEXT: call void @llvm.coro.resume(ptr %[[FRAME]])
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__builtin_coro_resume(__builtin_coro_frame());
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// CHECK-NEXT: call void @llvm.coro.destroy(ptr %[[FRAME]])
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__builtin_coro_destroy(__builtin_coro_frame());
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// CHECK-NEXT: call i1 @llvm.coro.done(ptr %[[FRAME]])
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__builtin_coro_done(__builtin_coro_frame());
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// CHECK-NEXT: call ptr @llvm.coro.promise(ptr %[[FRAME]], i32 48, i1 false)
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__builtin_coro_promise(__builtin_coro_frame(), 48, 0);
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// CHECK-NEXT: call ptr @llvm.coro.free(token %[[COROID]], ptr %[[FRAME]])
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__builtin_coro_free(__builtin_coro_frame());
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// CHECK-NEXT: call i1 @llvm.coro.end(ptr %[[FRAME]], i1 false, token none)
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__builtin_coro_end(__builtin_coro_frame(), 0);
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// CHECK-NEXT: call i8 @llvm.coro.suspend(token none, i1 true)
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__builtin_coro_suspend(1);
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}
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