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llvm-mirror/test/SafepointIRVerifier/uses-in-phi-nodes.ll
Max Kazantsev ee9e4fc042 [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 09:35:10 +00:00

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; 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!
; 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 ]
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!
; 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 ]
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
}
; 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
}
declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32, i32)
declare void @not_statepoint()
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