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4591f8af22
The LocalStackSlotPass pre-allocates a stack protector and makes sure that it comes before the local variables on the stack. We need to make sure that later during PEI we don't re-allocate a new stack protector slot. If that happens, the new stack protector slot will end up being **after** the local variables that it should be protecting. Therefore, we would have two slots assigned for two different stack protectors, one at the top of the stack, and one at the bottom. Since PEI will overwrite the assigned slot for the stack protector, the load that is used to compare the value of the stack protector will use the slot assigned by PEI, which is wrong. For this, we need to check if the object is pre-allocated, and re-use that pre-allocated slot. Differential Revision: https://reviews.llvm.org/D64757 llvm-svn: 366371
35 lines
1.5 KiB
YAML
35 lines
1.5 KiB
YAML
# RUN: llc -mtriple=arm64-apple-ios -start-before=localstackalloc -stop-after=prologepilog -o - %s | FileCheck %s
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--- |
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@__stack_chk_guard = external global i8*
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define i32 @main(i32, i8**) {
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%StackGuardSlot = alloca i8*
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unreachable
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}
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...
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---
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name: main
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tracksRegLiveness: true
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frameInfo:
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# CHECK: stackSize: 544
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stackProtector: '%stack.0.StackGuardSlot'
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stack:
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- { id: 0, name: StackGuardSlot, size: 8, alignment: 8, stack-id: default }
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# Verify that the offset assigned to the stack protector is at the top of the
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# frame, covering the locals.
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# CHECK: - { id: 0, name: StackGuardSlot, type: default, offset: -24, size: 8,
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# CHECK-NEXT: alignment: 8, stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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# CHECK-NEXT: local-offset: -8, debug-info-variable: '', debug-info-expression: '',
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# CHECK-NEXT: debug-info-location: '' }
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- { id: 1, size: 512, alignment: 1, stack-id: default }
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- { id: 2, size: 4, alignment: 4, stack-id: default }
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body: |
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bb.0:
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%25:gpr64common = LOAD_STACK_GUARD :: (dereferenceable invariant load 8 from @__stack_chk_guard)
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STRXui killed %25, %stack.0.StackGuardSlot, 0 :: (volatile store 8 into %stack.0.StackGuardSlot)
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%28:gpr64 = LDRXui %stack.0.StackGuardSlot, 0 :: (volatile load 8 from %stack.0.StackGuardSlot)
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%29:gpr64common = LOAD_STACK_GUARD :: (dereferenceable invariant load 8 from @__stack_chk_guard)
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RET_ReallyLR implicit undef $w0, implicit killed %28, implicit killed %29
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...
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