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[AArch64] [Windows] Fix llvm-readobj -unwind output with many epilogs.

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The number of epilog scopes may not fit into a uint8_t.

Fixes https://bugs.llvm.org/show_bug.cgi?id=40855

Differential Revision: https://reviews.llvm.org/D58693

llvm-svn: 355135
This commit is contained in:
Eli Friedman 2019-02-28 20:33:22 +00:00
parent 3581c4535e
commit 35f2f3bd52
2 changed files with 27 additions and 1 deletions
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2
include/llvm/Support/ARMWinEH.h
View File

@ -382,7 +382,7 @@ struct ExceptionDataRecord {
return ((Data[0] & 0x00400000) >> 22);
}
uint8_t EpilogueCount() const {
uint16_t EpilogueCount() const {
if (HeaderWords(*this) == 1) {
if (isAArch64)
return (Data[0] & 0x07C00000) >> 22;

26
test/tools/llvm-readobj/arm64-many-epilogs.s Normal file
View File

@ -0,0 +1,26 @@
// REQUIRES: aarch64-registered-target
// RUN: llvm-mc -filetype=obj -triple aarch64-windows %s -o - \
// RUN: | not llvm-readobj -unwind - | FileCheck %s
// Older versions of LLVM had a bug where we would accidentally
// truncate the number of epilogue scopes to a uint8_t; make
// sure this doesn't happen.
//
// We expect the llvm-readobj invocation to fail because the
// xdata section is truncated (to reduce the size of the testcase).
// CHECK: EpilogueScopes: 256
.section .pdata,"dr"
.long "?func@@YAHXZ"@IMGREL
.long "$unwind$func@@YAHXZ"@IMGREL
.text
.globl "?func@@YAHXZ"
.p2align 3
"?func@@YAHXZ":
ret
.section .xdata,"dr"
"$unwind$func@@YAHXZ":
.long 0x00000000, 0x02010100, 0x09000000, 0x0A000000