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MachO: trap unreachable instructions

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Debugability is more important than saving 4 bytes to let us to fall
through to nonense.

llvm-svn: 330073
This commit is contained in:
Tim Northover 2018-04-13 22:25:20 +00:00
parent 319405d79c
commit ab39f1740c
14 changed files with 47 additions and 12 deletions
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3
lib/Target/AArch64/AArch64TargetMachine.cpp
View File

@ -244,6 +244,9 @@ AArch64TargetMachine::AArch64TargetMachine(const Target &T, const Triple &TT,
TLOF(createTLOF(getTargetTriple())), isLittle(LittleEndian) {
initAsmInfo();
if (TT.isOSBinFormatMachO())
this->Options.TrapUnreachable = true;
// Enable GlobalISel at or below EnableGlobalISelAt0.
if (getOptLevel() <= EnableGlobalISelAtO)
setGlobalISel(true);

3
lib/Target/ARM/ARMTargetMachine.cpp
View File

@ -238,6 +238,9 @@ ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, const Triple &TT,
this->Options.EABIVersion = EABI::EABI5;
}
if (TT.isOSBinFormatMachO())
this->Options.TrapUnreachable = true;
initAsmInfo();
}

3
lib/Target/X86/X86TargetMachine.cpp
View File

@ -224,7 +224,8 @@ X86TargetMachine::X86TargetMachine(const Target &T, const Triple &TT,
// The check here for 64-bit windows is a bit icky, but as we're unlikely
// to ever want to mix 32 and 64-bit windows code in a single module
// this should be fine.
if ((TT.isOSWindows() && TT.getArch() == Triple::x86_64) || TT.isPS4())
if ((TT.isOSWindows() && TT.getArch() == Triple::x86_64) || TT.isPS4() ||
TT.isOSBinFormatMachO())
this->Options.TrapUnreachable = true;
initAsmInfo();

7
test/CodeGen/AArch64/macho-trap.ll Normal file
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@ -0,0 +1,7 @@
; RUN: llc -mtriple=aarch64-apple-ios7.0 %s -o - | FileCheck %s
define void @test_unreachable() {
; CHECK-LABEL: test_unreachable:
; CHECK: brk #0x1
unreachable
}

2
test/CodeGen/ARM/fast-isel-shift-materialize.ll
View File

@ -19,7 +19,7 @@ bb:
%tmp4 = lshr i32 %tmp3, 2
%tmp10 = lshr i32 %tmp9, 2
call void @foo(i32 %tmp10, i32 %tmp4)
unreachable
ret i32 undef
}
attributes #0 = { minsize }

10
test/CodeGen/ARM/macho-trap.ll Normal file
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@ -0,0 +1,10 @@
; RUN: llc -mtriple=armv7-apple-ios7.0 %s -o - | FileCheck %s
; RUN: llc -mtriple=thumbv7-apple-ios7.0 %s -o - | FileCheck %s
; RUN: llc -mtriple=thumbv7m-apple-macho %s -o - | FileCheck %s
; RUN: llc -mtriple=thumbv6m-apple-macho %s -o - | FileCheck %s
define void @test_unreachable() {
; CHECK-LABEL: test_unreachable:
; CHECK: trap
unreachable
}

4
test/CodeGen/Thumb2/thumb2-ifcvt2.ll
View File

@ -72,7 +72,7 @@ entry:
cond_true: ; preds = %entry
tail call void @abort( )
unreachable
ret void
cond_false: ; preds = %entry
ret void
@ -82,7 +82,7 @@ define fastcc void @t2() nounwind {
entry:
; CHECK-LABEL: t2:
; CHECK: cmp r0, #0
; CHECK: %growMapping.exit
; CHECK: trap
br i1 undef, label %bb.i.i3, label %growMapping.exit
bb.i.i3: ; preds = %entry

1
test/CodeGen/X86/avx512-fsel.ll
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@ -19,6 +19,7 @@ define i32 @test(float %a, float %b) {
; CHECK-NEXT: jmp LBB0_2
; CHECK-NEXT: LBB0_1: ## %L_0
; CHECK-NEXT: callq ___assert_rtn
; CHECK-NEXT: ud2
; CHECK-NEXT: LBB0_2: ## %L_1
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: popq %rcx

3
test/CodeGen/X86/br-fold.ll
View File

@ -5,8 +5,7 @@
; RUN: llc -mtriple=x86_64-scei-ps4 < %s | FileCheck -check-prefix=PS4 %s
; X64_DARWIN: orq
; X64_DARWIN-NEXT: jne
; X64_DARWIN-NEXT: %bb8.i329
; X64-DARWIN-NEXT: ud2
; X64_LINUX: orq %rax, %rcx
; X64_LINUX-NEXT: jne

1
test/CodeGen/X86/eh-frame-unreachable.ll
View File

@ -2,6 +2,7 @@
; Test that we don't emit a row that extends beyond the FDE's range_size.
;
; CHECK: movq %rsp, %rbp
; CHECK: ud2
; CHECK-NEXT: .cfi_endproc
; CHECK-NOT: .cfi

5
test/CodeGen/X86/empty-functions.ll
View File

@ -11,7 +11,7 @@ entry:
; MachO cannot handle an empty function.
; CHECK-NO-FP: _func:
; CHECK-NO-FP-NEXT: .cfi_startproc
; CHECK-NO-FP: nop
; CHECK-NO-FP: ud2
; CHECK-NO-FP-NEXT: .cfi_endproc
; CHECK-FP: _func:
@ -21,7 +21,8 @@ entry:
; CHECK-FP-NEXT: .cfi_def_cfa_offset 16
; CHECK-FP-NEXT: .cfi_offset %rbp, -16
; CHECK-FP-NEXT: movq %rsp, %rbp
; CHECK-FP-NEXT: .cfi_endproc
; CHECK-FP: ud2
; CHECK-FP: .cfi_endproc
; An empty function is perfectly fine on ELF.
; LINUX-NO-FP: func:

7
test/CodeGen/X86/macho-trap.ll Normal file
View File

@ -0,0 +1,7 @@
; RUN: llc -mtriple=x86_64-apple-macosx10.11 %s -o - | FileCheck %s
define void @test_unreachable() {
; CHECK-LABEL: test_unreachable:
; CHECK: ud2
unreachable
}

2
test/CodeGen/X86/pr34421.ll
View File

@ -14,6 +14,7 @@ define void @thread_selfcounts() noimplicitfloat noredzone nounwind {
; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X86-NEXT: movl %ecx, {{[0-9]+}}(%esp)
; X86-NEXT: movl %eax, {{[0-9]+}}(%esp)
; X86-NEXT: ud2
; X86-NEXT: ## -- End function
;
; X64-LABEL: thread_selfcounts:
@ -23,6 +24,7 @@ define void @thread_selfcounts() noimplicitfloat noredzone nounwind {
; X64-NEXT: movq {{[0-9]+}}(%rsp), %rcx
; X64-NEXT: movq %rax, (%rsp)
; X64-NEXT: movq %rcx, {{[0-9]+}}(%rsp)
; X64-NEXT: ud2
; X64-NEXT: ## -- End function
entry:
%counts = alloca [2 x i64], align 16

8
test/MC/MachO/ARM/empty-function-nop.ll
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@ -10,14 +10,14 @@ define internal fastcc void @empty_function() {
unreachable
}
; CHECK-T1: SectionData (
; CHECK-T1: 0000: C046 |.F|
; CHECK-T1: 0000: FEDE |..|
; CHECK-T1: )
; CHECK-T2: SectionData (
; CHECK-T2: 0000: 00BF |..|
; CHECK-T2: 0000: FEDE |..|
; CHECK-T2: )
; CHECK-ARM: SectionData (
; CHECK-ARM: 0000: 0000A0E1 |....|
; CHECK-ARM: 0000: FEDEFFE7 |....|
; CHECK-ARM: )
; CHECK-ARMV7: SectionData (
; CHECK-ARMV7: 0000: 00F020E3 |.. .|
; CHECK-ARMV7: 0000: FEDEFFE7 |....|
; CHECK-ARMV7: )