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2f21b887d3
Original Patch and summary by Philip Reames. RewriteStatepointsForGC tries to rewrite a function in a manner where the optimizer can't end up using a pointer value after it might have been relocated by a safepoint. This pass checks the invariant that RSForGC is supposed to establish and that (if we constructed semantics correctly) later passes must preserve. This has been a really useful diagnostic tool when initially developing the rewriting scheme and has found numerous bugs. Differential Revision: https://reviews.llvm.org/D15940 Reviewed by: swaroop.sridhar, mjacob Subscribers: llvm-commits llvm-svn: 307112
24 lines
1.2 KiB
LLVM
24 lines
1.2 KiB
LLVM
; RUN: opt -safepoint-ir-verifier-print-only -verify-safepoint-ir -S %s 2>&1 | FileCheck %s
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; This test checks that if a value is used immediately after a
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; safepoint without using the relocated value that the verifier
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; catches this.
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%jObject = type { [8 x i8] }
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; Function Attrs: nounwind
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define %jObject addrspace(1)* @test(%jObject addrspace(1)* %arg) gc "statepoint-example" {
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bci_0:
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%safepoint_token3 = tail call token (i64, i32, double (double)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_f64f64f(i64 0, i32 0, double (double)* undef, i32 1, i32 0, double undef, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, %jObject addrspace(1)* %arg)
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%arg2.relocated4 = call coldcc %jObject addrspace(1)* @llvm.experimental.gc.relocate.p1jObject(token %safepoint_token3, i32 13, i32 13)
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ret %jObject addrspace(1)* %arg
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; CHECK: Illegal use of unrelocated value found!
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; CHECK-NEXT: Def: %jObject addrspace(1)* %arg
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; CHECK-NEXT: Use: ret %jObject addrspace(1)* %arg
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}
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; Function Attrs: nounwind
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declare %jObject addrspace(1)* @llvm.experimental.gc.relocate.p1jObject(token, i32, i32) #3
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declare token @llvm.experimental.gc.statepoint.p0f_f64f64f(i64, i32, double (double)*, i32, i32, ...)
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