forked from OSchip/llvm-project
125 lines
5.9 KiB
LLVM
125 lines
5.9 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=i686-win32 | FileCheck %s
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; RUN: llc -verify-machineinstrs < %s -mtriple=i686-win32 -O0 | FileCheck %s
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; IR simplified from the following C++ snippet compiled for i686-windows-msvc:
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; struct A { A(); ~A(); int a; };
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;
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; struct B {
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; virtual int f(int);
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; virtual int g(A, int, A);
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; virtual void h(A, int, A);
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; virtual A i(A, int, A);
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; virtual A j(int);
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; };
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;
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; int (B::*mp_f)(int) = &B::f;
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; int (B::*mp_g)(A, int, A) = &B::g;
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; void (B::*mp_h)(A, int, A) = &B::h;
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; A (B::*mp_i)(A, int, A) = &B::i;
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; A (B::*mp_j)(int) = &B::j;
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; Each member pointer creates a thunk. The ones with inalloca are required to
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; tail calls by the ABI, even at O0.
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%struct.B = type { i32 (...)** }
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%struct.A = type { i32 }
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; CHECK-LABEL: f_thunk:
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_thiscallcc i32 @f_thunk(%struct.B* %this, i32) {
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entry:
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%1 = bitcast %struct.B* %this to i32 (%struct.B*, i32)***
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%vtable = load i32 (%struct.B*, i32)**, i32 (%struct.B*, i32)*** %1
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%2 = load i32 (%struct.B*, i32)*, i32 (%struct.B*, i32)** %vtable
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%3 = musttail call x86_thiscallcc i32 %2(%struct.B* %this, i32 %0)
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ret i32 %3
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}
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; Inalloca thunks shouldn't require any stores to the stack.
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; CHECK-LABEL: g_thunk:
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; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}}
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_thiscallcc i32 @g_thunk(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca) {
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entry:
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%1 = bitcast %struct.B* %this to i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)***
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%vtable = load i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)**, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** %1
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%vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 1
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%2 = load i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vfn
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%3 = musttail call x86_thiscallcc i32 %2(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca %0)
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ret i32 %3
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}
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; CHECK-LABEL: h_thunk:
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; CHECK: jmpl
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; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}}
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; CHECK-NOT: ret
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define x86_thiscallcc void @h_thunk(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca) {
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entry:
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%1 = bitcast %struct.B* %this to void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)***
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%vtable = load void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)**, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*** %1
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%vfn = getelementptr inbounds void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vtable, i32 2
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%2 = load void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)*, void (%struct.B*, <{ %struct.A, i32, %struct.A }>*)** %vfn
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musttail call x86_thiscallcc void %2(%struct.B* %this, <{ %struct.A, i32, %struct.A }>* inalloca %0)
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ret void
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}
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; CHECK-LABEL: i_thunk:
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; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}}
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_thiscallcc %struct.A* @i_thunk(%struct.B* %this, <{ %struct.A*, %struct.A, i32, %struct.A }>* inalloca) {
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entry:
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%1 = bitcast %struct.B* %this to %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)***
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%vtable = load %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)**, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*** %1
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%vfn = getelementptr inbounds %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)** %vtable, i32 3
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%2 = load %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)*, %struct.A* (%struct.B*, <{ %struct.A*, %struct.A, i32, %struct.A }>*)** %vfn
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%3 = musttail call x86_thiscallcc %struct.A* %2(%struct.B* %this, <{ %struct.A*, %struct.A, i32, %struct.A }>* inalloca %0)
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ret %struct.A* %3
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}
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; CHECK-LABEL: j_thunk:
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_thiscallcc void @j_thunk(%struct.A* noalias sret %agg.result, %struct.B* %this, i32) {
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entry:
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%1 = bitcast %struct.B* %this to void (%struct.A*, %struct.B*, i32)***
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%vtable = load void (%struct.A*, %struct.B*, i32)**, void (%struct.A*, %struct.B*, i32)*** %1
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%vfn = getelementptr inbounds void (%struct.A*, %struct.B*, i32)*, void (%struct.A*, %struct.B*, i32)** %vtable, i32 4
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%2 = load void (%struct.A*, %struct.B*, i32)*, void (%struct.A*, %struct.B*, i32)** %vfn
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musttail call x86_thiscallcc void %2(%struct.A* sret %agg.result, %struct.B* %this, i32 %0)
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ret void
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}
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; CHECK-LABEL: _stdcall_thunk@8:
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; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}}
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_stdcallcc i32 @stdcall_thunk(<{ %struct.B*, %struct.A }>* inalloca) {
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entry:
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%this_ptr = getelementptr inbounds <{ %struct.B*, %struct.A }>, <{ %struct.B*, %struct.A }>* %0, i32 0, i32 0
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%this = load %struct.B*, %struct.B** %this_ptr
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%1 = bitcast %struct.B* %this to i32 (<{ %struct.B*, %struct.A }>*)***
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%vtable = load i32 (<{ %struct.B*, %struct.A }>*)**, i32 (<{ %struct.B*, %struct.A }>*)*** %1
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%vfn = getelementptr inbounds i32 (<{ %struct.B*, %struct.A }>*)*, i32 (<{ %struct.B*, %struct.A }>*)** %vtable, i32 1
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%2 = load i32 (<{ %struct.B*, %struct.A }>*)*, i32 (<{ %struct.B*, %struct.A }>*)** %vfn
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%3 = musttail call x86_stdcallcc i32 %2(<{ %struct.B*, %struct.A }>* inalloca %0)
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ret i32 %3
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}
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; CHECK-LABEL: @fastcall_thunk@8:
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; CHECK-NOT: mov %{{.*}}, {{.*(.*esp.*)}}
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; CHECK: jmpl
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; CHECK-NOT: ret
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define x86_fastcallcc i32 @fastcall_thunk(%struct.B* inreg %this, <{ %struct.A }>* inalloca) {
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entry:
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%1 = bitcast %struct.B* %this to i32 (%struct.B*, <{ %struct.A }>*)***
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%vtable = load i32 (%struct.B*, <{ %struct.A }>*)**, i32 (%struct.B*, <{ %struct.A }>*)*** %1
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%vfn = getelementptr inbounds i32 (%struct.B*, <{ %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A }>*)** %vtable, i32 1
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%2 = load i32 (%struct.B*, <{ %struct.A }>*)*, i32 (%struct.B*, <{ %struct.A }>*)** %vfn
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%3 = musttail call x86_fastcallcc i32 %2(%struct.B* inreg %this, <{ %struct.A }>* inalloca %0)
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ret i32 %3
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}
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