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[Windows SEH] Fix crash on empty seh block (#107031)
Fixes #105813 and #106915. Adds a check for the end of the iterator, which can be a sentinel. The issue was introduced in 0efe111 from what I can see, so along with the introduction of /EHa support. (cherry picked from commit 2e0ded3)
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5 | ||
; RUN: llc -mtriple=x86_64-pc-windows-msvc19.41.34120 < %s | FileCheck %s | ||
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define void @foo() personality ptr @__CxxFrameHandler3 { | ||
; CHECK-LABEL: foo: | ||
; CHECK: # %bb.0: | ||
; CHECK-NEXT: nop # avoids zero-length function | ||
call void @llvm.seh.scope.begin() | ||
unreachable | ||
} | ||
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declare i32 @__CxxFrameHandler3(...) | ||
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declare void @llvm.seh.scope.begin() | ||
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!llvm.module.flags = !{!0} | ||
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!0 = !{i32 2, !"eh-asynch", i32 1} |