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cc3ff9c81d
Summary: [Coroutines] Part 9: Add cleanup subfunction. This patch completes coroutine heap allocation elision. Now, the heap elision example from docs\Coroutines.rst compiles and produces expected result (see test/Transform/Coroutines/ex3.ll) Intrinsic Changes: * coro.free gets a token parameter tying it to coro.id to allow reliably discovering all coro.frees associated with a particular coroutine. * coro.id gets an extra parameter that points back to a coroutine function. This allows to check whether a coro.id describes the enclosing function or it belongs to a different function that was later inlined. CoroSplit now creates three subfunctions: # f$resume - resume logic # f$destroy - cleanup logic, followed by a deallocation code # f$cleanup - just the cleanup code CoroElide pass during devirtualization replaces coro.destroy with either f$destroy or f$cleanup depending whether heap elision is performed or not. Other fixes, improvements: * Fixed buglet in Shape::buildFrame that was not creating coro.save properly if coroutine has more than one suspend point. * Switched to using variable width suspend index field (no longer limited to 32 bit index field can be as little as i1 or as large as i<whatever-size_t-is>) Reviewers: majnemer Subscribers: llvm-commits, mehdi_amini Differential Revision: https://reviews.llvm.org/D23844 llvm-svn: 279971
61 lines
1.8 KiB
LLVM
61 lines
1.8 KiB
LLVM
; Third example from Doc/Coroutines.rst (two suspend points)
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; RUN: opt < %s -O2 -enable-coroutines -S | FileCheck %s
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define i8* @f(i32 %n) {
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entry:
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%id = call token @llvm.coro.id(i32 0, i8* null, i8* null, i8* null)
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%size = call i32 @llvm.coro.size.i32()
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%alloc = call i8* @malloc(i32 %size)
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%hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %alloc)
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br label %loop
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loop:
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%n.val = phi i32 [ %n, %entry ], [ %inc, %loop.resume ]
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call void @print(i32 %n.val) #4
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%0 = call i8 @llvm.coro.suspend(token none, i1 false)
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switch i8 %0, label %suspend [i8 0, label %loop.resume
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i8 1, label %cleanup]
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loop.resume:
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%inc = add nsw i32 %n.val, 1
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%sub = xor i32 %n.val, -1
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call void @print(i32 %sub)
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%1 = call i8 @llvm.coro.suspend(token none, i1 false)
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switch i8 %1, label %suspend [i8 0, label %loop
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i8 1, label %cleanup]
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cleanup:
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%mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
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call void @free(i8* %mem)
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br label %suspend
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suspend:
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call void @llvm.coro.end(i8* %hdl, i1 false)
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ret i8* %hdl
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}
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; CHECK-LABEL: @main
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define i32 @main() {
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entry:
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%hdl = call i8* @f(i32 4)
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call void @llvm.coro.resume(i8* %hdl)
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call void @llvm.coro.resume(i8* %hdl)
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call void @llvm.coro.destroy(i8* %hdl)
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ret i32 0
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; CHECK: call void @print(i32 4)
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; CHECK-NEXT: call void @print(i32 -5)
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; CHECK-NEXT: call void @print(i32 5)
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; CHECK: ret i32 0
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}
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declare i8* @malloc(i32)
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declare void @free(i8*)
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declare void @print(i32)
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declare token @llvm.coro.id(i32, i8*, i8*, i8*)
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declare i1 @llvm.coro.alloc(token)
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declare i32 @llvm.coro.size.i32()
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declare i8* @llvm.coro.begin(token, i8*)
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declare i8 @llvm.coro.suspend(token, i1)
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declare i8* @llvm.coro.free(token, i8*)
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declare void @llvm.coro.end(i8*, i1)
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declare void @llvm.coro.resume(i8*)
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declare void @llvm.coro.destroy(i8*)
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