5e3d9fcc3a
The IR stack protector pass must insert stack checks before the call instead of between it and the return. Similarly, SDAG one should recognize that ADJCALLFRAME instructions could be part of the terminal sequence of a tail call. In this case because such call frames cannot be nested in LLVM the stack protection code must skip over the whole sequence (or risk clobbering argument registers).
27 lines
665 B
LLVM
27 lines
665 B
LLVM
; RUN: llc -mtriple=x86_64-windows-msvc %s -o - -verify-machineinstrs | FileCheck %s
|
|
|
|
declare void @h(i8*, i64, i8*)
|
|
|
|
define tailcc void @tailcall_frame(i8* %0, i64 %1) sspreq {
|
|
; CHECK-LABEL: tailcall_frame:
|
|
; CHECK: callq __security_check_cookie
|
|
; CHECK: xorl %ecx, %ecx
|
|
; CHECK: jmp h
|
|
|
|
tail call tailcc void @h(i8* null, i64 0, i8* null)
|
|
ret void
|
|
}
|
|
|
|
declare void @bar()
|
|
define void @tailcall_unrelated_frame() sspreq {
|
|
; CHECK-LABEL: tailcall_unrelated_frame:
|
|
; CHECK: subq [[STACK:\$.*]], %rsp
|
|
; CHECK: callq bar
|
|
; CHECK: callq __security_check_cookie
|
|
; CHECK: addq [[STACK]], %rsp
|
|
; CHECK: jmp bar
|
|
call void @bar()
|
|
tail call void @bar()
|
|
ret void
|
|
}
|