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https://github.com/c64scene-ar/llvm-6502.git
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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
35 lines
1.1 KiB
LLVM
35 lines
1.1 KiB
LLVM
;; RUN: opt -rewrite-statepoints-for-gc -verify -S < %s | FileCheck %s
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;; This test is to verify that RewriteStatepointsForGC correctly relocates values
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;; defined by invoke instruction results.
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declare i64* addrspace(1)* @non_gc_call()
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declare void @gc_call()
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declare i32* @fake_personality_function()
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; Function Attrs: nounwind
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define i64* addrspace(1)* @test() gc "statepoint-example" {
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entry:
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%obj = invoke i64* addrspace(1)* @non_gc_call()
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to label %normal_dest unwind label %unwind_dest
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unwind_dest:
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%lpad = landingpad { i8*, i32 } personality i32* ()* @fake_personality_function
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cleanup
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resume { i8*, i32 } undef
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normal_dest:
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;; CHECK-LABEL: normal_dest:
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;; CHECK-NEXT: gc.statepoint
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;; CHECK-NEXT: %obj.relocated = call coldcc i8 addrspace(1)*
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;; CHECK-NEXT: bitcast
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%safepoint_token = call i32 (void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()* @gc_call, i32 0, i32 0, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0)
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ret i64* addrspace(1)* %obj
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}
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(void ()*, i32, i32, ...)
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