tools/perf/util/debuginfo.c

File Facts

System

Linux kernel

Corpus path

tools/perf/util/debuginfo.c

Extension

.c

Size

4738 bytes

Lines

213

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• errno.h
• fcntl.h
• stdio.h
• stdlib.h
• string.h
• unistd.h
• linux/zalloc.h
• build-id.h
• dso.h
• debug.h
• debuginfo.h
• symbol.h
• elfutils/debuginfod.h

Detected Declarations

• function debuginfo__init_offline_dwarf
• function debuginfo__delete
• function debuginfo__get_text_offset
• function get_source_from_debuginfod

Annotated Snippet

if (strcmp(p, ".text") == 0) {
			/* OK, get the section header */
			scn = elf_getscn(elf, shndx);
			if (!scn)
				return -ENOENT;
			shdr = gelf_getshdr(scn, &mem);
			if (!shdr)
				return -ENOENT;
			*offs = shdr->sh_addr;
			if (adjust_offset)
				*offs -= shdr->sh_offset;
		}
	}
	return 0;
}

#ifdef HAVE_DEBUGINFOD_SUPPORT
int get_source_from_debuginfod(const char *raw_path,
			       const char *sbuild_id, char **new_path)
{
	debuginfod_client *c = debuginfod_begin();
	const char *p = raw_path;
	int fd;

	if (!c)
		return -ENOMEM;

	fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id,
				0, p, new_path);
	pr_debug("Search %s from debuginfod -> %d\n", p, fd);
	if (fd >= 0)
		close(fd);
	debuginfod_end(c);
	if (fd < 0) {
		pr_debug("Failed to find %s in debuginfod (%s)\n",
			raw_path, sbuild_id);
		return -ENOENT;
	}
	pr_debug("Got a source %s\n", *new_path);

	return 0;
}
#endif /* HAVE_DEBUGINFOD_SUPPORT */

Annotation

• Immediate include surface: `errno.h`, `fcntl.h`, `stdio.h`, `stdlib.h`, `string.h`, `unistd.h`, `linux/zalloc.h`, `build-id.h`.
• Detected declarations: `function debuginfo__init_offline_dwarf`, `function debuginfo__delete`, `function debuginfo__get_text_offset`, `function get_source_from_debuginfod`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.