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3087bcdef2
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307112 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
3.7 KiB
LLVM
71 lines
3.7 KiB
LLVM
; RUN: opt -safepoint-ir-verifier-print-only -verify-safepoint-ir -S %s 2>&1 | FileCheck %s
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define i8 addrspace(1)* @test1(i64 %arg) gc "statepoint-example" {
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; CHECK: No illegal uses found by SafepointIRVerifier in: test1
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entry:
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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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* null
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}
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define i8 addrspace(1)* @test2(i64 %arg) gc "statepoint-example" {
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; CHECK: No illegal uses found by SafepointIRVerifier in: test2
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entry:
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%load_addr = getelementptr i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*), i64 %arg
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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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %load_addr
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}
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define i8 addrspace(1)* @test3(i64 %arg) gc "statepoint-example" {
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; CHECK: No illegal uses found by SafepointIRVerifier in: test3
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entry:
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%load_addr = getelementptr i32, i32 addrspace(1)* inttoptr (i64 15 to i32 addrspace(1)*), i64 %arg
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%load_addr.cast = bitcast i32 addrspace(1)* %load_addr to i8 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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %load_addr.cast
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}
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define i8 addrspace(1)* @test4(i64 %arg, i1 %cond) gc "statepoint-example" {
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; CHECK: No illegal uses found by SafepointIRVerifier in: test4
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entry:
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%load_addr.1 = getelementptr i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*), i64 %arg
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br i1 %cond, label %split, label %join
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split:
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%load_addr.2 = getelementptr i8, i8 addrspace(1)* inttoptr (i64 30 to i8 addrspace(1)*), i64 %arg
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br label %join
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join:
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%load_addr = phi i8 addrspace(1)* [%load_addr.1, %entry], [%load_addr.2, %split]
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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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %load_addr
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}
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define i8 addrspace(1)* @test5(i64 %arg, i1 %cond) gc "statepoint-example" {
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; CHECK: No illegal uses found by SafepointIRVerifier in: test5
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entry:
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%load_addr.1 = getelementptr i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*), i64 %arg
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%load_addr.2 = getelementptr i8, i8 addrspace(1)* inttoptr (i64 30 to i8 addrspace(1)*), i64 %arg
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%load_addr = select i1 %cond, i8 addrspace(1)* %load_addr.1, i8 addrspace(1)* %load_addr.2
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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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %load_addr
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}
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define i8 addrspace(1)* @test6(i64 %arg, i1 %cond, i8 addrspace(1)* %base) gc "statepoint-example" {
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; CHECK-LABEL: Verifying gc pointers in function: test6
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; CHECK: Illegal use of unrelocated value found!
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entry:
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%load_addr.1 = getelementptr i8, i8 addrspace(1)* %base, i64 %arg
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br i1 %cond, label %split, label %join
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split:
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%load_addr.2 = getelementptr i8, i8 addrspace(1)* inttoptr (i64 30 to i8 addrspace(1)*), i64 %arg
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br label %join
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join:
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%load_addr = phi i8 addrspace(1)* [%load_addr.1, %entry], [%load_addr.2, %split]
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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 -1, i32 0, i32 0, i32 0)
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ret i8 addrspace(1)* %load_addr
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}
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
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