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8c0f3b6e8f
This patch fixes a bug in BOLT's debug line emission where functions that belong to multiple compilation units (such as inline functions in header files) were not handled correctly. Previously, BOLT incorrectly assumed that a binary function could belong to only one compilation unit, leading to incomplete or incorrect debug line information. ### **Problem** When a function appears in multiple compilation units (common scenarios include): * Template instantiated functions * Inline functions defined in header files included by multiple source files BOLT would only emit debug line information for one compilation unit, losing debug information for other CUs where the function was compiled. This resulted in incomplete debugging information and could cause debuggers to fail to set breakpoints or show incorrect source locations. ### **Root Cause** The issue was in BOLT's assumption that each binary function maps to exactly one compilation unit. However, when the same function (e.g., an inline function from a header) is compiled into multiple object files, it legitimately belongs to multiple CUs in the final binary.
106 lines
2.9 KiB
Bash
Executable File
106 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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# Script to process llvm-dwarfdump --debug-line output and create a normalized table
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# Usage: process-debug-line.sh <debug-line.txt>
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#
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# Output format: CU_FILE LINE COLUMN FILE_NAME [additional_info]
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# This strips addresses to make rows unique and adds context about which CU and file each line belongs to
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if [ $# -ne 1 ]; then
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echo "Usage: $0 <debug-line.txt>" >&2
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exit 1
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fi
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debug_line_file="$1"
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if [ ! -f "$debug_line_file" ]; then
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echo "Error: File '$debug_line_file' not found" >&2
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exit 1
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fi
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awk '
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BEGIN {
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cu_count = 0
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current_cu_file = ""
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# Initialize file names array
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for (i = 0; i < 100; i++) {
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current_file_names[i] = ""
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}
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}
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# Track debug_line sections (new CU)
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/^debug_line\[/ {
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cu_count++
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current_cu_file = ""
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# Clear file names array for new CU
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for (i = 0; i < 100; i++) {
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current_file_names[i] = ""
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}
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next
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}
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# Capture file names and their indices
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/^file_names\[.*\]:/ {
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# Extract file index using simple string operations
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line_copy = $0
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gsub(/file_names\[/, "", line_copy)
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gsub(/\]:.*/, "", line_copy)
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gsub(/[ \t]/, "", line_copy)
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file_index = line_copy
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getline # Read the next line which contains the actual filename
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# Extract filename from name: "filename" format
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if (match($0, /name:[ \t]*"/)) {
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filename = $0
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gsub(/.*name:[ \t]*"/, "", filename)
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gsub(/".*/, "", filename)
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current_file_names[file_index] = filename
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# Extract basename for main CU file (first .c/.cpp/.cc file we see)
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if (current_cu_file == "" && match(filename, /\.(c|cpp|cc)$/)) {
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cu_filename = filename
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gsub(/.*\//, "", cu_filename)
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current_cu_file = cu_filename
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}
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}
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next
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}
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# Process line table entries
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/^0x[0-9a-f]+/ {
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# Parse the line entry: Address Line Column File ISA Discriminator OpIndex Flags
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if (NF >= 4) {
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line = $2
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column = $3
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file_index = $4
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# Get the filename for this file index
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filename = current_file_names[file_index]
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if (filename == "") {
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filename = "UNKNOWN_FILE_" file_index
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} else {
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# Extract just the basename
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basename = filename
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gsub(/.*\//, "", basename)
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filename = basename
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}
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# Build additional info (flags, etc.)
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additional_info = ""
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for (i = 8; i <= NF; i++) {
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if (additional_info != "") {
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additional_info = additional_info " "
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}
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additional_info = additional_info $i
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}
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# Output normalized row: CU_FILE LINE COLUMN FILE_NAME [additional_info]
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printf "%s %s %s %s", current_cu_file, line, column, filename
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if (additional_info != "") {
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printf " %s", additional_info
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}
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printf "\n"
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}
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}
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' "$debug_line_file"
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