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[AArch64] Avoid crashing on .seh directives in assembly

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Differential Revision: https://reviews.llvm.org/D55670

llvm-svn: 349549
This commit is contained in:
Martin Storsjo 2018-12-18 22:10:17 +00:00
parent 1ec06e8f9f
commit f941197b23
2 changed files with 88 additions and 4 deletions
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8
lib/MC/MCWin64EH.cpp
View File

@ -468,10 +468,10 @@ static void ARM64EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) {
info->Symbol = Label;
uint32_t FuncLength = 0x0;
FuncLength = (uint32_t)GetAbsDifference(streamer, info->FuncletOrFuncEnd,
info->Begin);
if (FuncLength)
FuncLength /= 4;
if (info->FuncletOrFuncEnd)
FuncLength = (uint32_t)GetAbsDifference(streamer, info->FuncletOrFuncEnd,
info->Begin);
FuncLength /= 4;
uint32_t PrologCodeBytes = ARM64CountOfUnwindCodes(info->Instructions);
uint32_t TotalCodeBytes = PrologCodeBytes;

84
test/MC/AArch64/seh.s Normal file
View File

@ -0,0 +1,84 @@
// This test checks that the SEH directives emit the correct unwind data.
// RUN: llvm-mc -triple aarch64-pc-win32 -filetype=obj %s | llvm-readobj -s -r | FileCheck %s
// CHECK: Sections [
// CHECK: Section {
// CHECK: Name: .text
// CHECK: RelocationCount: 0
// CHECK: Characteristics [
// CHECK-NEXT: ALIGN_4BYTES
// CHECK-NEXT: CNT_CODE
// CHECK-NEXT: MEM_EXECUTE
// CHECK-NEXT: MEM_READ
// CHECK-NEXT: ]
// CHECK-NEXT: }
// CHECK: Section {
// CHECK: Name: .xdata
// CHECK: RawDataSize: 24
// CHECK: RelocationCount: 1
// CHECK: Characteristics [
// CHECK-NEXT: ALIGN_4BYTES
// CHECK-NEXT: CNT_INITIALIZED_DATA
// CHECK-NEXT: MEM_READ
// CHECK-NEXT: ]
// CHECK-NEXT: }
// CHECK: Section {
// CHECK: Name: .pdata
// CHECK: RelocationCount: 6
// CHECK: Characteristics [
// CHECK-NEXT: ALIGN_4BYTES
// CHECK-NEXT: CNT_INITIALIZED_DATA
// CHECK-NEXT: MEM_READ
// CHECK-NEXT: ]
// CHECK-NEXT: }
// CHECK-NEXT: ]
// CHECK-NEXT: Relocations [
// CHECK-NEXT: Section (4) .xdata {
// CHECK-NEXT: 0x8 IMAGE_REL_ARM64_ADDR32NB __C_specific_handler
// CHECK-NEXT: }
// CHECK-NEXT: Section (5) .pdata {
// CHECK-NEXT: 0x0 IMAGE_REL_ARM64_ADDR32NB func
// CHECK-NEXT: 0x4 IMAGE_REL_ARM64_ADDR32NB .xdata
// CHECK-NEXT: 0x8 IMAGE_REL_ARM64_ADDR32NB func
// CHECK-NEXT: 0xC IMAGE_REL_ARM64_ADDR32NB .xdata
// CHECK-NEXT: 0x10 IMAGE_REL_ARM64_ADDR32NB smallFunc
// CHECK-NEXT: 0x14 IMAGE_REL_ARM64_ADDR32NB .xdata
// CHECK-NEXT: }
// CHECK-NEXT: ]
.text
.globl func
.def func
.scl 2
.type 32
.endef
.seh_proc func
func:
sub sp, sp, #24
.seh_stackalloc 24
mov x29, sp
.seh_endprologue
.seh_handler __C_specific_handler, @except
.seh_handlerdata
.long 0
.text
.seh_startchained
.seh_endprologue
.seh_endchained
add sp, sp, #24
ret
.seh_endproc
// Test emission of small functions.
.globl smallFunc
.def smallFunc
.scl 2
.type 32
.endef
.seh_proc smallFunc
smallFunc:
ret
.seh_endproc