Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/tools/llvm-dwarfdump/X86/Inputs/typeunit-header.s

@@ -0,0 +1,49 @@
+# Test object with an artifically constructed type unit header to verify 
+# that the length field is correctly used to verify the validity of the
+# type_offset field.
+#
+# To generate the test object:
+# llvm-mc -triple x86_64-unknown-linux typeunit-header.s -filetype=obj \
+#         -o typeunit-header.elf-x86-64
+#
+# We only have an abbreviation for the type unit die which is all we need.
+# Real type unit dies have quite different attributes of course, but we
+# just need to demonstrate an issue with validating length, so we just give it
+# a single visibility attribute.
+        .section .debug_abbrev,"",@progbits
+        .byte 0x01  # Abbrev code
+        .byte 0x41  # DW_TAG_type_unit
+        .byte 0x01  # DW_CHILDREN_yes
+        .byte 0x17  # DW_AT_visibility
+        .byte 0x0b  # DW_FORM_data1
+        .byte 0x00  # EOM(1)
+        .byte 0x00  # EOM(2)
+        .byte 0x02  # Abbrev code
+        .byte 0x13  # DW_TAG_structure_type
+        .byte 0x00  # DW_CHILDREN_no (no members)
+        .byte 0x17  # DW_AT_visibility
+        .byte 0x0b  # DW_FORM_data1
+        .byte 0x00  # EOM(1)
+        .byte 0x00  # EOM(2)
+        .byte 0x00  # EOM(3)
+        
+        .section .debug_types,"",@progbits
+# DWARF v4 Type unit header - DWARF32 format.
+TU_4_32_start:
+        .long TU_4_32_end-TU_4_32_version  # Length of Unit
+TU_4_32_version:
+        .short 4               # DWARF version number
+        .long .debug_abbrev    # Offset Into Abbrev. Section
+        .byte 8                # Address Size (in bytes)
+        .quad 0x0011223344556677 # Type Signature
+        .long TU_4_32_type-TU_4_32_start # Type offset
+# The type-unit DIE, which has just a visibility attribute.
+        .byte 1                # Abbreviation code
+        .byte 1                # DW_VIS_local
+# The type DIE, which also just has a one-byte visibility attribute.
+TU_4_32_type:
+        .byte 2                # Abbreviation code
+        .byte 1                # DW_VIS_local
+        .byte 0 # NULL
+        .byte 0 # NULL
+TU_4_32_end: