[llvm] [BOLT][DWARF] Update DW_AT_comp_dir/DW_AT_dwo_name for DWO TUs (PR #91486)

[via llvm-commits]

================
@@ -0,0 +1,198 @@
+; RUN: rm -rf %t
+; RUN: mkdir %t
+; RUN: cd %t
+; RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-df-types-debug-names-main.s \
+; RUN: -split-dwarf-file=main.dwo -o main.o
+; RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-df-types-dup-helper.s \
+; RUN: -split-dwarf-file=helper.dwo -o helper.o
+; RUN: %clang %cflags -gdwarf-5 -gsplit-dwarf=split main.o helper.o -o main.exe
+; RUN: llvm-bolt main.exe -o main.exe.bolt --update-debug-sections
+; RUN: llvm-dwarfdump --debug-info -r 0 main.exe.bolt > log.txt
+; RUN: llvm-dwarfdump --debug-info -r 0 main.dwo.dwo >> log.txt
+; RUN: llvm-dwarfdump --debug-info -r 0 helper.dwo.dwo >> log.txt
+; RUN: llvm-dwarfdump --debug-str-offsets main.dwo.dwo >> log.txt
+; RUN: llvm-dwarfdump --debug-str-offsets helper.dwo.dwo >> log.txt
+; RUN: cat log.txt | FileCheck -check-prefix=BOLT %s
+
+;; Test is a mix of DWARF5 TUs where one has DW_AT_comp_dir/DW_AT_dwo_name, and another one doesn't.
+;; Tests that BOLT correctly updates DW_AT_dwo_name for TUs.
+
+; BOLT: DW_TAG_skeleton_unit
+; BOLT: DW_AT_comp_dir  (".")
+; BOLT: DW_AT_dwo_name  ("main.dwo.dwo")
+; BOLT: DW_TAG_skeleton_unit
+; BOLT: DW_AT_comp_dir  (".")
+; BOLT: DW_AT_dwo_name  ("helper.dwo.dwo")
+; BOLT: DW_TAG_type_unit
+; BOLT: DW_AT_comp_dir  (".")
+; BOLT: DW_AT_dwo_name  ("main.dwo.dwo")
+; BOLT: DW_TAG_type_unit
+; BOLT: DW_AT_comp_dir  (".")
+; BOLT: DW_AT_dwo_name  ("main.dwo.dwo")
+; BOLT: DW_TAG_type_unit
+; BOLT-NOT: DW_AT_dwo_name
+; BOLT: DW_TAG_type_unit
+; BOLT-NOT: DW_AT_dwo_name
+; BOLT: DW_TAG_compile_unit
+; BOLT:      .debug_str_offsets.dwo contents:
+; BOLT-NEXT: 0x00000000: Contribution size = 68, Format = DWARF32, Version = 5
+; BOLT-NEXT: "main"
+; BOLT-NEXT: "int"
+; BOLT-NEXT: "argc"
+; BOLT-NEXT: "argv"
+; BOLT-NEXT: "char"
+; BOLT-NEXT: "f2"
+; BOLT-NEXT: "."
+; BOLT-NEXT: "main.dwo.dwo"
+; BOLT-NEXT: "c1"
+; BOLT-NEXT: "Foo2"
+; BOLT-NEXT: "f3"
+; BOLT-NEXT: "c2"
+; BOLT-NEXT: "c3"
+; BOLT-NEXT: "Foo2a"
+; BOLT-NEXT: "clang version 18.0.0git (git at github.com:ayermolo/llvm-project.git db35fa8fc524127079662802c4735dbf397f86d0)"
----------------
klensy wrote:

hardcoded version should fail?

https://github.com/llvm/llvm-project/pull/91486