tools/perf/util/symbol.c

Source file repositories/reference/linux-study-clean/tools/perf/util/symbol.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/symbol.c
Extension
.c
Size
62905 bytes
Lines
2638
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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct map_list_node {
	struct list_head node;
	struct map *map;
};

static struct map_list_node *map_list_node__new(void)
{
	return malloc(sizeof(struct map_list_node));
}

static enum dso_binary_type binary_type_symtab[] = {
	DSO_BINARY_TYPE__KALLSYMS,
	DSO_BINARY_TYPE__GUEST_KALLSYMS,
	DSO_BINARY_TYPE__JAVA_JIT,
	DSO_BINARY_TYPE__DEBUGLINK,
	DSO_BINARY_TYPE__BUILD_ID_CACHE,
	DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
	DSO_BINARY_TYPE__GNU_DEBUGDATA,
	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
	DSO_BINARY_TYPE__GUEST_KMODULE,
	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
	DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
	DSO_BINARY_TYPE__NOT_FOUND,
};

#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)

static bool symbol_type__filter(char symbol_type)
{
	symbol_type = toupper(symbol_type);
	return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
}

static int prefix_underscores_count(const char *str)
{
	const char *tail = str;

	while (*tail == '_')
		tail++;

	return tail - str;
}

const char * __weak arch__normalize_symbol_name(const char *name)
{
	return name;
}

int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
{
	return strcmp(namea, nameb);
}

int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
					unsigned int n)
{
	return strncmp(namea, nameb, n);
}

int __weak arch__choose_best_symbol(struct symbol *syma,
				    struct symbol *symb __maybe_unused)
{
	/* Avoid "SyS" kernel syscall aliases */
	if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
		return SYMBOL_B;
	if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
		return SYMBOL_B;

	return SYMBOL_A;
}

static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
{
	s64 a;
	s64 b;
	size_t na, nb;

	/* Prefer a symbol with non zero length */
	a = syma->end - syma->start;
	b = symb->end - symb->start;
	if ((b == 0) && (a > 0))
		return SYMBOL_A;
	else if ((a == 0) && (b > 0))
		return SYMBOL_B;

Annotation

Implementation Notes