b3458fdec5
Windows x64 Unwind V2 adds epilog information to unwind data: specifically, the length of the epilog and the offset of each epilog. The first step to do this is to add markers to the beginning and end of each epilog when generating Windows x64 code. I've modelled this after how LLVM was marking ARM and AArch64 epilogs in Windows (and unified the code between the three).
98 lines
2.6 KiB
LLVM
98 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=x86_64-windows-msvc < %s | FileCheck %s
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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define void @"\01?f@@YAXXZ"(i1 %B) personality ptr @__CxxFrameHandler3 {
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entry:
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invoke void @g()
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to label %unreachable unwind label %cleanupblock
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cleanupblock:
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%cleanp = cleanuppad within none []
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call void @g() [ "funclet"(token %cleanp) ]
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cleanupret from %cleanp unwind label %catch.dispatch
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catch.dispatch:
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%cs1 = catchswitch within none [label %catch] unwind to caller
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catch:
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%cp = catchpad within %cs1 [ptr null, i32 64, ptr null]
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call void @g() [ "funclet"(token %cp) ]
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catchret from %cp to label %try.cont
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try.cont:
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ret void
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unreachable:
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unreachable
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}
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declare void @g()
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declare i32 @__CxxFrameHandler3(...)
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; Destructors need CFI but they shouldn't use the .seh_handler directive.
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; CHECK: "?dtor$[[cleanup:[0-9]+]]@?0??f@@YAXXZ@4HA":
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; CHECK: .seh_proc "?dtor$[[cleanup]]@?0??f@@YAXXZ@4HA"
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; CHECK-NOT: .seh_handler __CxxFrameHandler3
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; CHECK: LBB0_[[cleanup]]: # %cleanupblock{{$}}
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; Emit CFI for pushing RBP.
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; CHECK: movq %rdx, 16(%rsp)
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; CHECK: pushq %rbp
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; CHECK: .seh_pushreg %rbp
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; Emit CFI for allocating from the stack pointer.
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; CHECK: subq $32, %rsp
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; CHECK: .seh_stackalloc 32
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; CHECK: leaq 48(%rdx), %rbp
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; CHECK-NOT: .seh_setframe
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; Prologue is done, emit the .seh_endprologue directive.
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; CHECK: .seh_endprologue
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; Make sure there is a nop after a call if the call precedes the epilogue.
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; CHECK: callq g
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; CHECK-NEXT: nop
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; CHECK-NEXT: .seh_startepilogue
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; Don't emit a reference to the LSDA.
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; CHECK: .seh_handlerdata
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; CHECK-NOT: .long ("$cppxdata$?f@@YAXXZ")@IMGREL
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; CHECK-NEXT: .text
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; CHECK: .seh_endproc
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; CHECK: "?catch$[[catch:[0-9]+]]@?0??f@@YAXXZ@4HA":
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; CHECK: .seh_proc "?catch$[[catch]]@?0??f@@YAXXZ@4HA"
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; CHECK-NEXT: .seh_handler __CxxFrameHandler3, @unwind, @except
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; CHECK: LBB0_[[catch]]: # %catch{{$}}
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; Emit CFI for pushing RBP.
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; CHECK: movq %rdx, 16(%rsp)
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; CHECK: pushq %rbp
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; CHECK: .seh_pushreg %rbp
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; Emit CFI for allocating from the stack pointer.
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; CHECK: subq $32, %rsp
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; CHECK: .seh_stackalloc 32
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; CHECK: leaq 48(%rdx), %rbp
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; CHECK-NOT: .seh_setframe
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; Prologue is done, emit the .seh_endprologue directive.
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; CHECK: .seh_endprologue
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; Make sure there is at least one instruction after a call before the epilogue.
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; CHECK: callq g
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; CHECK-NEXT: leaq .LBB0_{{[0-9]+}}(%rip), %rax
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; CHECK-NEXT: .seh_startepilogue
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; Emit a reference to the LSDA.
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; CHECK: .seh_handlerdata
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; CHECK-NEXT: .long ("$cppxdata$?f@@YAXXZ")@IMGREL
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; CHECK-NEXT: .text
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; CHECK: .seh_endproc
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