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5b5782c20e
Summary: In RewriteStatepointsForGC pass, we create a gc_relocate intrinsic for each relocated pointer, and the gc_relocate has the same type with the pointer. During the creation of gc_relocate intrinsic, llvm requires to mangle its type. However, llvm does not support mangling of all possible types. RewriteStatepointsForGC will hit an assertion failure when it tries to create a gc_relocate for pointer to vector of pointers because mangling for vector of pointers is not supported. This patch changes the way RewriteStatepointsForGC pass creates gc_relocate. For each relocated pointer, we erase the type of pointers and create an unified gc_relocate of type i8 addrspace(1)*. Then a bitcast is inserted to convert the gc_relocate to the correct type. In this way, gc_relocate does not need to deal with different types of pointers and the unsupported type mangling is no longer a problem. This change would also ease further merge when LLVM erases types of pointers and introduces an unified pointer type. Some minor changes are also introduced to gc_relocate related part in InstCombineCalls, CodeGenPrepare, and Verifier accordingly. Patch by Chen Li! Reviewers: reames, AndyAyers, sanjoy Reviewed By: sanjoy Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D9592 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237009 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
1.1 KiB
LLVM
20 lines
1.1 KiB
LLVM
; RUN: opt %s -rewrite-statepoints-for-gc -S 2>&1 | FileCheck %s
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; This test is to verify gc.relocate can handle pointer to vector of
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; pointers (<2 x i32 addrspace(1)*> addrspace(1)* in this case).
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; The old scheme to create a gc.relocate of <2 x i32 addrspace(1)*> addrspace(1)*
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; type will fail because llvm does not support mangling vector of pointers.
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; The new scheme will create all gc.relocate to i8 addrspace(1)* type and
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; then bitcast to the correct type.
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declare void @foo()
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declare void @use(...)
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)
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define void @test1(<2 x i32 addrspace(1)*> addrspace(1)* %obj) gc "statepoint-example" {
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entry:
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%safepoint_token = call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @foo, i32 0, i32 0, i32 0, i32 0)
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; CHECK: %obj.relocated = call coldcc i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(i32 %safepoint_token, i32 5, i32 5)
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; CHECK-NEXT: %obj.relocated.casted = bitcast i8 addrspace(1)* %obj.relocated to <2 x i32 addrspace(1)*> addrspace(1)*
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call void (...) @use(<2 x i32 addrspace(1)*> addrspace(1)* %obj)
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ret void
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} |