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c022b8d288
This changes the shape of the statepoint intrinsic from:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 unused, ...call args, i32 # deopt args, ...deopt args, ...gc args)
to:
@llvm.experimental.gc.statepoint(anyptr target, i32 # call args, i32 flags, ...call args, i32 # transition args, ...transition args, i32 # deopt args, ...deopt args, ...gc args)
This extension offers the backend the opportunity to insert (somewhat) arbitrary code to manage the transition from GC-aware code to code that is not GC-aware and back.
In order to support the injection of transition code, this extension wraps the STATEPOINT ISD node generated by the usual lowering lowering with two additional nodes: GC_TRANSITION_START and GC_TRANSITION_END. The transition arguments that were passed passed to the intrinsic (if any) are lowered and provided as operands to these nodes and may be used by the backend during code generation.
Eventually, the lowering of the GC_TRANSITION_{START,END} nodes should be informed by the GC strategy in use for the function containing the intrinsic call; for now, these nodes are instead replaced with no-ops.
Differential Revision: http://reviews.llvm.org/D9501
llvm-svn: 236888
105 lines
4.0 KiB
LLVM
105 lines
4.0 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; This file contains a collection of basic tests to ensure we didn't
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; screw up normal call lowering when there are no deopt or gc arguments.
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target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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declare zeroext i1 @return_i1()
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declare zeroext i32 @return_i32()
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declare i32* @return_i32ptr()
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declare float @return_float()
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declare void @varargf(i32, ...)
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define i1 @test_i1_return() gc "statepoint-example" {
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; CHECK-LABEL: test_i1_return
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; This is just checking that a i1 gets lowered normally when there's no extra
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; state arguments to the statepoint
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; CHECK: pushq %rax
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; CHECK: callq return_i1
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; CHECK: popq %rdx
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; CHECK: retq
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entry:
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%safepoint_token = tail call i32 (i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0)
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%call1 = call zeroext i1 @llvm.experimental.gc.result.i1(i32 %safepoint_token)
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ret i1 %call1
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}
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define i32 @test_i32_return() gc "statepoint-example" {
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; CHECK-LABEL: test_i32_return
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; CHECK: pushq %rax
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; CHECK: callq return_i32
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; CHECK: popq %rdx
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; CHECK: retq
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entry:
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%safepoint_token = tail call i32 (i32 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i32f(i32 ()* @return_i32, i32 0, i32 0, i32 0, i32 0)
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%call1 = call zeroext i32 @llvm.experimental.gc.result.i32(i32 %safepoint_token)
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ret i32 %call1
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}
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define i32* @test_i32ptr_return() gc "statepoint-example" {
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; CHECK-LABEL: test_i32ptr_return
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; CHECK: pushq %rax
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; CHECK: callq return_i32ptr
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; CHECK: popq %rdx
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; CHECK: retq
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entry:
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%safepoint_token = tail call i32 (i32* ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p0i32f(i32* ()* @return_i32ptr, i32 0, i32 0, i32 0, i32 0)
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%call1 = call i32* @llvm.experimental.gc.result.p0i32(i32 %safepoint_token)
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ret i32* %call1
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}
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define float @test_float_return() gc "statepoint-example" {
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; CHECK-LABEL: test_float_return
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; CHECK: pushq %rax
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; CHECK: callq return_float
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; CHECK: popq %rax
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; CHECK: retq
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entry:
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%safepoint_token = tail call i32 (float ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_f32f(float ()* @return_float, i32 0, i32 0, i32 0, i32 0)
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%call1 = call float @llvm.experimental.gc.result.f32(i32 %safepoint_token)
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ret float %call1
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}
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define i1 @test_relocate(i32 addrspace(1)* %a) gc "statepoint-example" {
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; CHECK-LABEL: test_relocate
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; Check that an ununsed relocate has no code-generation impact
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; CHECK: pushq %rax
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; CHECK: callq return_i1
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; CHECK-NEXT: .Ltmp9:
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; CHECK-NEXT: popq %rdx
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; CHECK-NEXT: retq
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entry:
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%safepoint_token = tail call i32 (i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0, i32 addrspace(1)* %a)
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%call1 = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %safepoint_token, i32 5, i32 5)
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%call2 = call zeroext i1 @llvm.experimental.gc.result.i1(i32 %safepoint_token)
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ret i1 %call2
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}
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define void @test_void_vararg() gc "statepoint-example" {
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; CHECK-LABEL: test_void_vararg
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; Check a statepoint wrapping a *void* returning vararg function works
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; CHECK: callq varargf
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entry:
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%safepoint_token = tail call i32 (void (i32, ...)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidi32varargf(void (i32, ...)* @varargf, i32 2, i32 0, i32 42, i32 43, i32 0, i32 0)
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;; if we try to use the result from a statepoint wrapping a
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;; non-void-returning varargf, we will experience a crash.
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ret void
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}
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declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i1 ()*, i32, i32, ...)
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declare i1 @llvm.experimental.gc.result.i1(i32)
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declare i32 @llvm.experimental.gc.statepoint.p0f_i32f(i32 ()*, i32, i32, ...)
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declare i32 @llvm.experimental.gc.result.i32(i32)
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declare i32 @llvm.experimental.gc.statepoint.p0f_p0i32f(i32* ()*, i32, i32, ...)
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declare i32* @llvm.experimental.gc.result.p0i32(i32)
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declare i32 @llvm.experimental.gc.statepoint.p0f_f32f(float ()*, i32, i32, ...)
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declare float @llvm.experimental.gc.result.f32(i32)
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declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidi32varargf(void (i32, ...)*, i32, i32, ...)
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declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)
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