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llvm-project/llvm/test/SafepointIRVerifier/uses-in-phi-nodes.ll

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[SafepointIRVerifier] Add verifier pass for finding GC relocation bugs 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
2017-07-05 09:16:29 +08:00
; RUN: opt -safepoint-ir-verifier-print-only -verify-safepoint-ir -S %s 2>&1 | FileCheck %s
define i8 addrspace(1)* @test.not.ok.0(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.not.ok.0
bci_0:
br i1 undef, label %left, label %right
left:
%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)
br label %merge
right:
br label %merge
merge:
; CHECK: Illegal use of unrelocated value found!
[SafepointIRVerifier] Allow non-dereferencing uses of unrelocated or poisoned PHI nodes PHI that has at least one unrelocated input cannot cause any issues by itself, though its uses should be carefully verified. With this patch PHIs are allowed to have any inputs but when all inputs are unrelocated the PHI is marked as unrelocated and if not all inputs are unrelocated then the PHI is marked as poisoned. Poisoned pointers can be used only in three ways: to derive new pointers, in PHIs or in comparisons against constants that are exclusively derived from null. Patch by Daniil Suchkov! Differential Revision: https://reviews.llvm.org/D41006 llvm-svn: 321438
2017-12-25 17:35:10 +08:00
; CHECK-NEXT: Def: %val = phi i8 addrspace(1)* [ %arg, %left ], [ %arg, %right ]
; CHECK-NEXT: Use: ret i8 addrspace(1)* %val
%val = phi i8 addrspace(1)* [ %arg, %left ], [ %arg, %right ]
[SafepointIRVerifier] Add verifier pass for finding GC relocation bugs 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
2017-07-05 09:16:29 +08:00
ret i8 addrspace(1)* %val
}
define i8 addrspace(1)* @test.not.ok.1(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.not.ok.1
bci_0:
br i1 undef, label %left, label %right
left:
%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)
br label %merge
right:
br label %merge
merge:
; CHECK: Illegal use of unrelocated value found!
[SafepointIRVerifier] Allow non-dereferencing uses of unrelocated or poisoned PHI nodes PHI that has at least one unrelocated input cannot cause any issues by itself, though its uses should be carefully verified. With this patch PHIs are allowed to have any inputs but when all inputs are unrelocated the PHI is marked as unrelocated and if not all inputs are unrelocated then the PHI is marked as poisoned. Poisoned pointers can be used only in three ways: to derive new pointers, in PHIs or in comparisons against constants that are exclusively derived from null. Patch by Daniil Suchkov! Differential Revision: https://reviews.llvm.org/D41006 llvm-svn: 321438
2017-12-25 17:35:10 +08:00
; CHECK-NEXT: Def: %val = phi i8 addrspace(1)* [ %arg, %left ], [ null, %right ]
; CHECK-NEXT: Use: ret i8 addrspace(1)* %val
%val = phi i8 addrspace(1)* [ %arg, %left ], [ null, %right ]
[SafepointIRVerifier] Add verifier pass for finding GC relocation bugs 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
2017-07-05 09:16:29 +08:00
ret i8 addrspace(1)* %val
}
define i8 addrspace(1)* @test.ok.0(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK: No illegal uses found by SafepointIRVerifier in: test.ok.0
bci_0:
br i1 undef, label %left, label %right
left:
%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)
br label %merge
right:
br label %merge
merge:
%val = phi i8 addrspace(1)* [ null, %left ], [ null, %right]
ret i8 addrspace(1)* %val
}
define i8 addrspace(1)* @test.ok.1(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK: No illegal uses found by SafepointIRVerifier in: test.ok.1
bci_0:
br i1 undef, label %left, label %right
left:
call void @not_statepoint()
br label %merge
right:
br label %merge
merge:
%val = phi i8 addrspace(1)* [ %arg, %left ], [ %arg, %right]
ret i8 addrspace(1)* %val
}
[SafepointIRVerifier] Allow non-dereferencing uses of unrelocated or poisoned PHI nodes PHI that has at least one unrelocated input cannot cause any issues by itself, though its uses should be carefully verified. With this patch PHIs are allowed to have any inputs but when all inputs are unrelocated the PHI is marked as unrelocated and if not all inputs are unrelocated then the PHI is marked as poisoned. Poisoned pointers can be used only in three ways: to derive new pointers, in PHIs or in comparisons against constants that are exclusively derived from null. Patch by Daniil Suchkov! Differential Revision: https://reviews.llvm.org/D41006 llvm-svn: 321438
2017-12-25 17:35:10 +08:00
; It should be allowed to compare poisoned ptr with null.
define void @test.poisoned.cmp.ok(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.poisoned.cmp.ok
bci_0:
br i1 undef, label %left, label %right
left:
%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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
%arg.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; arg, arg
br label %merge
right:
%safepoint_token2 = 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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
br label %merge
merge:
; CHECK: No illegal uses found by SafepointIRVerifier in: test.poisoned.cmp.ok
%val.poisoned = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg, %right ]
%c = icmp eq i8 addrspace(1)* %val.poisoned, null
ret void
}
; It is illegal to compare poisoned ptr and relocated.
define void @test.poisoned.cmp.fail.0(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.poisoned.cmp.fail.0
bci_0:
br i1 undef, label %left, label %right
left:
%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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
%arg.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; arg, arg
br label %merge
right:
%safepoint_token2 = 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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
%arg.relocated2 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token2, i32 7, i32 7) ; arg, arg
br label %merge
merge:
; CHECK: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %val.poisoned = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg, %right ]
; CHECK-NEXT: Use: %c = icmp eq i8 addrspace(1)* %val.poisoned, %val
%val.poisoned = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg, %right ]
%val = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg.relocated2, %right ]
%c = icmp eq i8 addrspace(1)* %val.poisoned, %val
ret void
}
; It is illegal to compare poisoned ptr and unrelocated.
define void @test.poisoned.cmp.fail.1(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.poisoned.cmp.fail.1
bci_0:
br i1 undef, label %left, label %right
left:
%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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
%arg.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; arg, arg
br label %merge
right:
%safepoint_token2 = 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 0, i8 addrspace(1)* %arg , i32 -1, i32 0, i32 0, i32 0)
%arg.relocated2 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token2, i32 7, i32 7) ; arg, arg
br label %merge
merge:
; CHECK: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %val.poisoned = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg, %right ]
; CHECK-NEXT: Use: %c = icmp eq i8 addrspace(1)* %val.poisoned, %arg
%val.poisoned = phi i8 addrspace(1)* [ %arg.relocated, %left ], [ %arg, %right ]
%c = icmp eq i8 addrspace(1)* %val.poisoned, %arg
ret void
}
; It should be allowed to compare unrelocated phi with unrelocated value.
define void @test.unrelocated-phi.cmp.ok(i8 addrspace(1)* %arg) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.unrelocated-phi.cmp.ok
bci_0:
br i1 undef, label %left, label %right
left:
%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)
br label %merge
right:
br label %merge
merge:
; CHECK: No illegal uses found by SafepointIRVerifier in: test.unrelocated-phi.cmp.ok
%val.unrelocated = phi i8 addrspace(1)* [ %arg, %left ], [ null, %right ]
%c = icmp eq i8 addrspace(1)* %val.unrelocated, %arg
ret void
}
[SafepointIRVerifier] Add verifier pass for finding GC relocation bugs 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
2017-07-05 09:16:29 +08:00
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
[SafepointIRVerifier] Allow non-dereferencing uses of unrelocated or poisoned PHI nodes PHI that has at least one unrelocated input cannot cause any issues by itself, though its uses should be carefully verified. With this patch PHIs are allowed to have any inputs but when all inputs are unrelocated the PHI is marked as unrelocated and if not all inputs are unrelocated then the PHI is marked as poisoned. Poisoned pointers can be used only in three ways: to derive new pointers, in PHIs or in comparisons against constants that are exclusively derived from null. Patch by Daniil Suchkov! Differential Revision: https://reviews.llvm.org/D41006 llvm-svn: 321438
2017-12-25 17:35:10 +08:00
declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32, i32)
[SafepointIRVerifier] Add verifier pass for finding GC relocation bugs 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
2017-07-05 09:16:29 +08:00
declare void @not_statepoint()