[llvm] [llvm-debuginfo-analyzer] Fix crash with WebAssembly dead code (PR #141616)

[Carlos Alberto Enciso via llvm-commits]

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@@ -0,0 +1,124 @@
+# REQUIRES: x86-registered-target
+
+# llvm-debuginfo-analyzer crashes on dead code
+# https://github.com/llvm/llvm-project/issues/136772
+
+# For the attached reproducer:
+# llvm-dwarfdump out/lzma-lzmadec.wasm --all
+#
+# shows:
+#
+# 0x000002b3:   DW_TAG_subprogram
+#                 DW_AT_low_pc	(dead code)
+#                 DW_AT_high_pc	(0x00000362)
+#                 DW_AT_frame_base	(DW_OP_WASM_location 0x0 0x6, DW_OP_stack_value)
+
+# llvm-debuginfo-analyzer out/lzma-lzmadec.wasm --print=instructions
+#
+# crashes and shows a stack dump:
+#
+# PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/
+# and include the crash backtrace.
+# Stack dump:
+# 0. Program arguments: llvm-debuginfo-analyzer out/lzma-lzmadec.wasm --print=instructions
+
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CarlosAlbertoEnciso wrote:

Renamed the test case and reworked the comments to add clarity.

https://github.com/llvm/llvm-project/pull/141616