maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/CodeGen/X86/patchable-prologue.ll

44 lines
1.1 KiB
LLVM
Raw Normal View History

Introduce a "patchable-function" function attribute Summary: The `"patchable-function"` attribute can be used by an LLVM client to influence LLVM's code generation in ways that makes the generated code easily patchable at runtime (for instance, to redirect control). Right now only one patchability scheme is supported, `"prologue-short-redirect"`, but this can be expanded in the future. Reviewers: joker.eph, rnk, echristo, dberris Subscribers: joker.eph, echristo, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19046 llvm-svn: 266715
2016-04-19 13:24:47 +08:00
; RUN: llc -filetype=obj -o - -mtriple=x86_64-apple-macosx < %s | llvm-objdump -triple x86_64-apple-macosx -disassemble - | FileCheck %s
; RUN: llc -mtriple=x86_64-apple-macosx < %s | FileCheck %s --check-prefix=CHECK-ALIGN
declare void @callee(i64*)
define void @f0() "patchable-function"="prologue-short-redirect" {
; CHECK-LABEL: _f0:
; CHECK-NEXT: 66 90 nop
; CHECK-ALIGN: .p2align 4, 0x90
; CHECK-ALIGN: _f0:
ret void
}
define void @f1() "patchable-function"="prologue-short-redirect" "no-frame-pointer-elim"="true" {
; CHECK-LABEL: _f1
; CHECK-NEXT: ff f5 pushq %rbp
; CHECK-ALIGN: .p2align 4, 0x90
; CHECK-ALIGN: _f1:
ret void
}
define void @f2() "patchable-function"="prologue-short-redirect" {
; CHECK-LABEL: _f2
; CHECK-NEXT: 48 81 ec a8 00 00 00 subq $168, %rsp
; CHECK-ALIGN: .p2align 4, 0x90
; CHECK-ALIGN: _f2:
%ptr = alloca i64, i32 20
call void @callee(i64* %ptr)
ret void
}
define void @f3() "patchable-function"="prologue-short-redirect" optsize {
; CHECK-LABEL: _f3
; CHECK-NEXT: 66 90 nop
; CHECK-ALIGN: .p2align 4, 0x90
; CHECK-ALIGN: _f3:
ret void
}