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[Statepoints] Let patchable statepoints have a symbolic call target.

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Summary:
As added initially, statepoints required their call targets to be a
constant pointer null if ``numPatchBytes`` was non-zero.  This turns out
to be a problem ergonomically, since there is no way to mark patchable
statepoints as calling a (readable) symbolic value.

This change remove the restriction of requiring ``null`` call targets
for patchable statepoints, and changes PlaceSafepoints to maintain the
symbolic call target through its transformation.

Reviewers: reames, swaroop.sridhar

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11550

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-07-28 23:50:30 +00:00
parent a27dfaf544
commit 44d65eac43
6 changed files with 25 additions and 32 deletions
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2
test/Transforms/PlaceSafepoints/patchable-statepoints.ll
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@@ -22,7 +22,7 @@ define void @test_num_patch_bytes() gc "statepoint-example" personality i32 ()*
; CHECK-LABEL: @test_num_patch_bytes(
entry:
; CHECK-LABEL: entry:
; CHECK: invoke i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 99, void ()* null,
; CHECK: invoke i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 99, void ()* @f,
invoke void @f() "statepoint-num-patch-bytes"="99" to label %normal_return unwind label %exceptional_return
normal_return: