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c60ad3e1fe
Summary: This patch changes gc.statepoint intrinsic's return type to token type instead of i32 type. Using token types could prevent LLVM to merge different gc.statepoint nodes into PHI nodes and cause further problems with gc relocations. The patch also changes the way on how gc.relocate and gc.result look for their corresponding gc.statepoint on unwind path. The current implementation uses the selector value extracted from a { i8*, i32 } landingpad as a hook to find the gc.statepoint, while the patch directly uses a token type landingpad (http://reviews.llvm.org/D15405) to find the gc.statepoint.
Reviewers: sanjoy, JosephTremoulet, pgavlin, igor-laevsky, mjacob
Subscribers: reames, mjacob, sanjoy, llvm-commits
Differential Revision: http://reviews.llvm.org/D15662
llvm-svn: 256443
82 lines
3.9 KiB
LLVM
82 lines
3.9 KiB
LLVM
; RUN: opt -S %s -verify | FileCheck %s
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declare void @use(...)
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declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32, i32)
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declare i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token, i32, i32)
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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declare i32 @"personality_function"()
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;; Basic usage
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define i64 addrspace(1)* @test1(i8 addrspace(1)* %arg) gc "statepoint-example" {
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entry:
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%cast = bitcast i8 addrspace(1)* %arg to i64 addrspace(1)*
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%safepoint_token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* undef, i32 0, i32 0, i32 0, i32 5, i32 0, i32 0, i32 0, i32 10, i32 0, i8 addrspace(1)* %arg, i64 addrspace(1)* %cast, i8 addrspace(1)* %arg, i8 addrspace(1)* %arg)
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%reloc = call i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %safepoint_token, i32 12, i32 13)
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;; It is perfectly legal to relocate the same value multiple times...
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%reloc2 = call i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %safepoint_token, i32 12, i32 13)
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%reloc3 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 13, i32 12)
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ret i64 addrspace(1)* %reloc
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; CHECK-LABEL: test1
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; CHECK: statepoint
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; CHECK: gc.relocate
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; CHECK: gc.relocate
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; CHECK: gc.relocate
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; CHECK: ret i64 addrspace(1)* %reloc
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}
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; This test catches two cases where the verifier was too strict:
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; 1) A base doesn't need to be relocated if it's never used again
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; 2) A value can be replaced by one which is known equal. This
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; means a potentially derived pointer can be known base and that
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; we can't check that derived pointer are never bases.
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define void @test2(i8 addrspace(1)* %arg, i64 addrspace(1)* %arg2) gc "statepoint-example" {
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entry:
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%cast = bitcast i8 addrspace(1)* %arg to i64 addrspace(1)*
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%c = icmp eq i64 addrspace(1)* %cast, %arg2
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br i1 %c, label %equal, label %notequal
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notequal:
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ret void
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equal:
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%safepoint_token = call token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* undef, i32 0, i32 0, i32 0, i32 5, i32 0, i32 0, i32 0, i32 10, i32 0, i8 addrspace(1)* %arg, i64 addrspace(1)* %cast, i8 addrspace(1)* %arg, i8 addrspace(1)* %arg)
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%reloc = call i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %safepoint_token, i32 12, i32 13)
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call void undef(i64 addrspace(1)* %reloc)
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ret void
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; CHECK-LABEL: test2
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; CHECK-LABEL: equal
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; CHECK: statepoint
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; CHECK-NEXT: %reloc = call
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; CHECK-NEXT: call
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; CHECK-NEXT: ret voi
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}
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; Basic test for invoke statepoints
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define i8 addrspace(1)* @test3(i8 addrspace(1)* %obj, i8 addrspace(1)* %obj1) gc "statepoint-example" personality i32 ()* @"personality_function" {
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; CHECK-LABEL: test3
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entry:
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; CHECK-LABEL: entry
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; CHECK: statepoint
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%0 = invoke token (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* undef, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i8 addrspace(1)* %obj, i8 addrspace(1)* %obj1)
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to label %normal_dest unwind label %exceptional_return
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normal_dest:
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; CHECK-LABEL: normal_dest:
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; CHECK: gc.relocate
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; CHECK: gc.relocate
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; CHECK: ret
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%obj.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %0, i32 12, i32 12)
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%obj1.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %0, i32 12, i32 12)
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ret i8 addrspace(1)* %obj.relocated
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exceptional_return:
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; CHECK-LABEL: exceptional_return
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; CHECK: gc.relocate
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; CHECK: gc.relocate
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%landing_pad = landingpad token
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cleanup
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%obj.relocated1 = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %landing_pad, i32 12, i32 12)
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%obj1.relocated1 = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %landing_pad, i32 12, i32 12)
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ret i8 addrspace(1)* %obj1.relocated1
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}
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