derek.holloway
7502bf64a4
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67 lines
1.9 KiB
ArmAsm
67 lines
1.9 KiB
ArmAsm
## This checks that shrink wrapping uses the red zone defined in the X86 ABI by
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## placing restores that access elements already deallocated by the stack.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
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# RUN: %s -o %t.o
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# RUN: link_fdata %s %t.o %t.fdata
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# RUN: llvm-strip --strip-unneeded %t.o
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# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -nostdlib
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# RUN: llvm-bolt -relocs %t.exe -o %t.out -data %t.fdata \
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# RUN: -frame-opt=all -simplify-conditional-tail-calls=false \
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# RUN: -experimental-shrink-wrapping \
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# RUN: -eliminate-unreachable=false | FileCheck %s
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# RUN: llvm-objdump -d %t.out --print-imm-hex | \
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# RUN: FileCheck --check-prefix CHECK-OBJDUMP %s
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## Here we create a CFG where the restore position matches the previous (deleted)
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## restore position. Shrink wrapping then will put a stack access to an element
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## that was deallocated at the previously deleted POP, which falls in the red
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## zone and should be safe for X86 Linux ABI.
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.globl _start
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.type _start, %function
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_start:
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.cfi_startproc
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# FDATA: 0 [unknown] 0 1 _start 0 0 1
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push %rbp
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mov %rsp, %rbp
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push %rbx
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push %r14
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subq $0x20, %rsp
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b: je hot_path
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# FDATA: 1 _start #b# 1 _start #hot_path# 0 1
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cold_path:
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mov %r14, %rdi
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mov %rbx, %rdi
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movq rel(%rip), %rdi # Add this to create a relocation and run bolt w/ relocs
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leaq -0x20(%rbp), %r14
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movq -0x20(%rbp), %rdi
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leaq -0x10(%rbp), %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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hot_path:
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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.cfi_endproc
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end:
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.size _start, .-_start
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.data
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rel: .quad end
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# CHECK: BOLT-INFO: Shrink wrapping moved 2 spills inserting load/stores and 0 spills inserting push/pops
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# CHECK-OBJDUMP: <_start>:
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# CHECK-OBJDUMP: leaq (%rbp), %rsp
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# CHECK-OBJDUMP-NEXT: popq %rbp
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# CHECK-OBJDUMP-NEXT: movq -0x10(%rsp), %rbx
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# CHECK-OBJDUMP-NEXT: movq -0x18(%rsp), %r14
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# CHECK-OBJDUMP-NEXT: retq
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