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llvm-mirror/test/SafepointIRVerifier/use-derived-unrelocated.ll
Anna Thomas 83fe6115e6 [SafepointIRVerifier] Allow deriving pointers from unrelocated base 
Summary:
This patch allows to use derived pointers (GEPs/bitcasts) of unrelocated
base pointers. We care only about the uses of these derived pointers.

It is acheived by two changes:
1. When we have enough information to say if the pointer is unrelocated at some
point or not, we walk all BBs to remove from their Contributions all valid defs
of unrelocated pointers (GEP with unrelocated base or bitcast of unrelocated
pointer).
2. When it comes to verification we just ignore instructions that were removed
at stage 1.

Patch by Daniil Suchkov!

Reviewers: anna, reames, apilipenko, mkazantsev

Reviewed By: anna, mkazantsev

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D40289

llvm-svn: 319838
2017-12-05 21:39:37 +00:00

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9.5 KiB
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; RUN: opt -safepoint-ir-verifier-print-only -verify-safepoint-ir -S %s 2>&1 | FileCheck %s
; Checking if verifier accepts chain of GEPs/bitcasts.
define void @test.deriving.ok(i32, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.deriving.ok
; CHECK-NEXT: No illegal uses found by SafepointIRVerifier in: test.deriving.ok
%ptr = getelementptr i8, i8 addrspace(1)* %base1, i64 4
%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)* %base1)
%ptr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
%ptr.i32 = bitcast i8 addrspace(1)* %ptr to i32 addrspace(1)*
%ptr2.i32 = bitcast i8 addrspace(1)* %ptr2 to i32 addrspace(1)*
ret void
}
; Checking if verifier accepts cmp of two derived pointers when one defined
; before safepoint and one after and both have unrelocated base.
define void @test.cmp.ok(i32, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.cmp.ok
; CHECK-NEXT: No illegal uses found by SafepointIRVerifier in: test.cmp.ok
%ptr = getelementptr i8, i8 addrspace(1)* %base1, i64 4
%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)* %base1)
%ptr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
%c2 = icmp sgt i8 addrspace(1)* %ptr2, %ptr
ret void
}
; Checking if verifier accepts cmp of two derived pointers when one defined
; before safepoint and one after and both have unrelocated base. One of pointers
; defined as a long chain of geps/bitcasts.
define void @test.cmp-long_chain.ok(i32, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.cmp-long_chain.ok
; CHECK-NEXT: No illegal uses found by SafepointIRVerifier in: test.cmp-long_chain.ok
%ptr = getelementptr i8, i8 addrspace(1)* %base1, i64 4
%ptr.i32 = bitcast i8 addrspace(1)* %ptr to i32 addrspace(1)*
%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)* %base1)
%ptr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
%ptr2.i32 = bitcast i8 addrspace(1)* %ptr2 to i32 addrspace(1)*
%ptr2.i32.2 = getelementptr i32, i32 addrspace(1)* %ptr2.i32, i64 4
%ptr2.i32.3 = getelementptr i32, i32 addrspace(1)* %ptr2.i32.2, i64 8
%ptr2.i32.4 = getelementptr i32, i32 addrspace(1)* %ptr2.i32.3, i64 8
%ptr2.i32.5 = getelementptr i32, i32 addrspace(1)* %ptr2.i32.4, i64 8
%ptr2.i32.6 = getelementptr i32, i32 addrspace(1)* %ptr2.i32.5, i64 8
%ptr2.i32.6.i8 = bitcast i32 addrspace(1)* %ptr2.i32.6 to i8 addrspace(1)*
%ptr2.i32.6.i8.i32 = bitcast i8 addrspace(1)* %ptr2.i32.6.i8 to i32 addrspace(1)*
%ptr2.i32.6.i8.i32.2 = getelementptr i32, i32 addrspace(1)* %ptr2.i32.6.i8.i32, i64 8
%c2 = icmp sgt i32 addrspace(1)* %ptr2.i32.6.i8.i32.2, %ptr.i32
ret void
}
; GEP and bitcast of unrelocated pointer is acceptable, but load by resulting
; pointer should be reported.
define void @test.load.fail(i32, i8 addrspace(1)* %base) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.load.fail
%ptr = getelementptr i8, i8 addrspace(1)* %base, i64 4
%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)* %base)
%ptr.i32 = bitcast i8 addrspace(1)* %ptr to i32 addrspace(1)* ; it's ok
; CHECK-NEXT: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %ptr.i32 = bitcast i8 addrspace(1)* %ptr to i32 addrspace(1)*
; CHECK-NEXT: Use: %ptr.val = load i32, i32 addrspace(1)* %ptr.i32
%ptr.val = load i32, i32 addrspace(1)* %ptr.i32
ret void
}
; Comparison between pointer derived from unrelocated one (though defined after
; safepoint) and relocated pointer should be reported.
define void @test.cmp.fail(i64 %arg, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.cmp.fail
%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)* %base2 , i32 -1, i32 0, i32 0, i32 0)
%base2.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; base2, base2
%addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
; CHECK-NEXT: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
; CHECK-NEXT: Use: %cmp = icmp eq i8 addrspace(1)* %addr1, %base2.relocated
%cmp = icmp eq i8 addrspace(1)* %addr1, %base2.relocated
ret void
}
; Same as test.cmp.fail but splitted into two BBs.
define void @test.cmp2.fail(i64 %arg, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
.b0:
; CHECK-LABEL: Verifying gc pointers in function: test.cmp2.fail
%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)* %base2 , i32 -1, i32 0, i32 0, i32 0)
%base2.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; base2, base2
%addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
br label %.b1
.b1:
; CHECK-NEXT: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
; CHECK-NEXT: Use: %cmp = icmp eq i8 addrspace(1)* %addr1, %base2.relocated
%cmp = icmp eq i8 addrspace(1)* %addr1, %base2.relocated
ret void
}
; Checking that cmp of two unrelocated pointers is OK and load is not.
define void @test.cmp-load.fail(i64 %arg, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.cmp-load.fail
%addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
%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)* %base2 , i32 -1, i32 0, i32 0, i32 0)
%addr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
%cmp = icmp eq i8 addrspace(1)* %addr1, %addr2
; CHECK-NEXT: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %addr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
; CHECK-NEXT: Use: %val = load i8, i8 addrspace(1)* %addr2
%val = load i8, i8 addrspace(1)* %addr2
ret void
}
; Same as test.cmp-load.fail but splitted into thee BBs.
define void @test.cmp-load2.fail(i64 %arg, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
.b0:
; CHECK-LABEL: Verifying gc pointers in function: test.cmp-load2.fail
%addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
%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)* %base2 , i32 -1, i32 0, i32 0, i32 0)
br label %.b1
.b1:
%addr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
br label %.b2
.b2:
%cmp = icmp eq i8 addrspace(1)* %addr1, %addr2
; CHECK-NEXT: Illegal use of unrelocated value found!
; CHECK-NEXT: Def: %addr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 8
; CHECK-NEXT: Use: %val = load i8, i8 addrspace(1)* %addr2
%val = load i8, i8 addrspace(1)* %addr2
ret void
}
; Same as test.cmp.ok but with multiple safepoints within one BB. And the last
; one is in the very end of BB so that Contribution of this BB is empty.
define void @test.cmp.multi-sp.ok(i64 %arg, i8 addrspace(1)* %base1, i8 addrspace(1)* %base2) gc "statepoint-example" {
; CHECK-LABEL: Verifying gc pointers in function: test.cmp.multi-sp.ok
; CHECK-NEXT: No illegal uses found by SafepointIRVerifier in: test.cmp.multi-sp.ok
%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)* %base2 , i32 -1, i32 0, i32 0, i32 0)
%base2.relocated = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token, i32 7, i32 7) ; base2, base2
%addr1 = getelementptr i8, i8 addrspace(1)* %base1, i64 %arg
%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)* %base2.relocated, i32 -1, i32 0, i32 0, i32 0)
%base2.relocated2 = call i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token %safepoint_token2, i32 7, i32 7) ; base2.relocated, base2.relocated
%addr2 = getelementptr i8, i8 addrspace(1)* %base2, i64 %arg
%cmp = icmp eq i8 addrspace(1)* %addr1, %addr2
%safepoint_token3 = 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)* %base2.relocated2, i32 -1, i32 0, i32 0, i32 0)
ret void
}
; Function Attrs: nounwind
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)
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