auto import from //depot/cupcake/@135843
diff --git a/tools/lsd/lsd.c b/tools/lsd/lsd.c
new file mode 100644
index 0000000..03c235b
--- /dev/null
+++ b/tools/lsd/lsd.c
@@ -0,0 +1,777 @@
+#include <stdio.h>
+#include <common.h>
+#include <debug.h>
+#include <libelf.h>
+#include <libebl.h>
+#include <elf.h>
+#include <gelf.h>
+#include <string.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <hash.h>
+#include <lsd.h>
+
+extern int verbose_flag;
+
+typedef struct source_t source_t;
+
+typedef struct {
+ Elf_Scn *scn;
+ GElf_Shdr shdr;
+ Elf_Data *data;
+} section_info_t;
+
+typedef struct next_export_t {
+ source_t *source;
+ int next_idx;
+} next_export_t;
+
+struct source_t {
+ source_t *next;
+ int visited;
+
+ char *name; /* full path name of this executable file */
+ /* ELF-related information: */
+ Elf *elf;
+ int elf_fd;
+ GElf_Ehdr elf_hdr;
+ size_t shstrndx;
+ int shnum; /* number of sections */
+
+ section_info_t symtab;
+ section_info_t strtab;
+ section_info_t dynamic;
+ section_info_t hash;
+
+ section_info_t *relocations;
+ int num_relocations; /* number of relocs (<= relocations_size) */
+ int relocations_size; /* sice of array -- NOT number of relocs! */
+
+ /* satisfied_execs: array containing pointers to the libraries or
+ executables that this executable satisfies symbol references for. */
+ source_t **satisfied_execs;
+ int num_satisfied_execs;
+ int satisfied_execs_size;
+
+ /* satisfied: array is parallel to symbol table; for each undefined symbol
+ in that array, we maintain a flag stating whether that symbol has been
+ satisfied, and if so, by which library. This applies both to executable
+ files and libraries.
+ */
+ source_t **satisfied;
+
+ /* exports: array is parallel to symbol table; for each global symbol
+ in that array, we maintain a flag stating whether that symbol satisfies
+ a dependency in some other file. num_syms is the length of the exports
+ array, as well as the satisfied array. This applied to libraries only.
+
+ next_exports: this is a bit tricky. We use this field to maintain a
+ linked list of source_t for each global symbol of a shared library.
+ For a shared library's global symbol at index N has the property that
+ exports[N] is the head of a linked list (threaded through next_export)
+ of all source_t that this symbol resolves a reference to. For example,
+ if symbol printf has index 1000 in libc.so, and an executable A and
+ library L use printf, then the source_t entry corresponding to libc.so
+ will have exports[1000] be a linked list that contains the nodes for
+ application A and library L.
+ */
+
+ next_export_t *exports;
+ /* num_exported is the number of symbols in this file actually used by
+ somebody else; it's not the size of the exports array. */
+ int num_exported;
+ next_export_t *next_export;
+ int num_next_export;
+ int next_export_size;
+
+ int num_syms; /* number of symbols in symbol table. This is the length of
+ both exports[] and satisfied[] arrays. */
+
+ /* This is an array that contains one element for each library dependency
+ listed in the executable or shared library. */
+ source_t **lib_deps; /* list of library dependencies */
+ int num_lib_deps; /* actual number of library dependencies */
+ int lib_deps_size; /* size of lib_deps array--NOT actual number of deps! */
+
+};
+
+static source_t *sources = NULL;
+
+static char * find_file(const char *libname,
+ char **lib_lookup_dirs,
+ int num_lib_lookup_dirs);
+
+static inline source_t* find_source(const char *name,
+ char **lib_lookup_dirs,
+ int num_lib_lookup_dirs) {
+ source_t *trav = sources;
+ char *full = find_file(name, lib_lookup_dirs, num_lib_lookup_dirs);
+ FAILIF(full == NULL, "Cannot construct full path for file [%s]!\n", name);
+ while (trav) {
+ if (!strcmp(trav->name, full))
+ break;
+ trav = trav->next;
+ }
+ free(full);
+ return trav;
+}
+
+static inline void add_to_sources(source_t *src) {
+ src->next = sources;
+ sources = src;
+}
+
+static source_t* init_source(char *full_path) {
+ source_t *source = (source_t *)CALLOC(1, sizeof(source_t));
+
+ ASSERT(full_path);
+ source->name = full_path;
+ source->elf_fd = -1;
+
+ INFO("Opening %s...\n", full_path);
+ source->elf_fd = open(full_path, O_RDONLY);
+ FAILIF(source->elf_fd < 0, "open(%s): %s (%d)\n",
+ full_path,
+ strerror(errno),
+ errno);
+ INFO("Calling elf_begin(%s)...\n", full_path);
+ source->elf = elf_begin(source->elf_fd, ELF_C_READ, NULL);
+ FAILIF_LIBELF(source->elf == NULL, elf_begin);
+
+ /* libelf can recognize COFF and A.OUT formats, but we handle only ELF. */
+ if (elf_kind(source->elf) != ELF_K_ELF) {
+ ERROR("Input file %s is not in ELF format!\n", full_path);
+ return NULL;
+ }
+
+ /* Make sure this is a shared library or an executable. */
+ {
+ INFO("Making sure %s is a shared library or an executable...\n",
+ full_path);
+ FAILIF_LIBELF(0 == gelf_getehdr(source->elf, &source->elf_hdr), gelf_getehdr);
+ FAILIF(source->elf_hdr.e_type != ET_DYN &&
+ source->elf_hdr.e_type != ET_EXEC,
+ "%s must be a shared library (elf type is %d, expecting %d).\n",
+ full_path,
+ source->elf_hdr.e_type,
+ ET_DYN);
+ }
+
+ /* Get the index of the section-header-strings-table section. */
+ FAILIF_LIBELF(elf_getshstrndx (source->elf, &source->shstrndx) < 0,
+ elf_getshstrndx);
+
+ FAILIF_LIBELF(elf_getshnum (source->elf, &source->shnum) < 0, elf_getshnum);
+
+ /* Find various sections. */
+ size_t scnidx;
+ Elf_Scn *scn;
+ GElf_Shdr *shdr, shdr_mem;
+ INFO("Locating %d sections in %s...\n", source->shnum, full_path);
+ for (scnidx = 1; scnidx < source->shnum; scnidx++) {
+ scn = elf_getscn(source->elf, scnidx);
+ FAILIF_LIBELF(NULL == scn, elf_getscn);
+ shdr = gelf_getshdr(scn, &shdr_mem);
+ FAILIF_LIBELF(NULL == shdr, gelf_getshdr);
+ INFO("\tfound section [%s]...\n", elf_strptr(source->elf, source->shstrndx, shdr->sh_name));
+ if (shdr->sh_type == SHT_DYNSYM) {
+ source->symtab.scn = scn;
+ source->symtab.data = elf_getdata(scn, NULL);
+ FAILIF_LIBELF(NULL == source->symtab.data, elf_getdata);
+ memcpy(&source->symtab.shdr, shdr, sizeof(GElf_Shdr));
+
+ /* The sh_link field of the section header of the symbol table
+ contains the index of the associated strings table. */
+ source->strtab.scn = elf_getscn(source->elf,
+ source->symtab.shdr.sh_link);
+ FAILIF_LIBELF(NULL == source->strtab.scn, elf_getscn);
+ FAILIF_LIBELF(NULL == gelf_getshdr(scn, &source->strtab.shdr),
+ gelf_getshdr);
+ source->strtab.data = elf_getdata(source->strtab.scn, NULL);
+ FAILIF_LIBELF(NULL == source->strtab.data, elf_getdata);
+ }
+ else if (shdr->sh_type == SHT_DYNAMIC) {
+ source->dynamic.scn = scn;
+ source->dynamic.data = elf_getdata(scn, NULL);
+ FAILIF_LIBELF(NULL == source->symtab.data, elf_getdata);
+ memcpy(&source->dynamic.shdr, shdr, sizeof(GElf_Shdr));
+ }
+ else if (shdr->sh_type == SHT_HASH) {
+ source->hash.scn = scn;
+ source->hash.data = elf_getdata(scn, NULL);
+ FAILIF_LIBELF(NULL == source->hash.data, elf_getdata);
+ memcpy(&source->hash.shdr, shdr, sizeof(GElf_Shdr));
+ }
+ else if (shdr->sh_type == SHT_REL || shdr->sh_type == SHT_RELA) {
+ if (source->num_relocations == source->relocations_size) {
+ source->relocations_size += 5;
+ source->relocations =
+ (section_info_t *)REALLOC(source->relocations,
+ source->relocations_size *
+ sizeof(section_info_t));
+ }
+ section_info_t *reloc =
+ source->relocations + source->num_relocations;
+ reloc->scn = scn;
+ reloc->data = elf_getdata(scn, NULL);
+ FAILIF_LIBELF(NULL == reloc->data, elf_getdata);
+ memcpy(&reloc->shdr, shdr, sizeof(GElf_Shdr));
+ source->num_relocations++;
+ }
+ }
+
+ if (source->dynamic.scn == NULL) {
+ INFO("File [%s] does not have a dynamic section!\n", full_path);
+ return 0;
+ }
+
+ FAILIF(source->symtab.scn == NULL,
+ "File [%s] does not have a dynamic symbol table!\n",
+ full_path);
+
+ FAILIF(source->hash.scn == NULL,
+ "File [%s] does not have a hash table!\n",
+ full_path);
+ FAILIF(source->hash.shdr.sh_link != elf_ndxscn(source->symtab.scn),
+ "Hash points to section %d, not to %d as expected!\n",
+ source->hash.shdr.sh_link,
+ elf_ndxscn(scn));
+
+ /* Now, find out how many symbols we have and allocate the array of
+ satisfied symbols.
+
+ NOTE: We don't count the number of undefined symbols here; we will
+ iterate over the symbol table later, and count them then, when it is
+ more convenient.
+ */
+ size_t symsize = gelf_fsize (source->elf,
+ ELF_T_SYM,
+ 1, source->elf_hdr.e_version);
+ ASSERT(symsize);
+
+ source->num_syms = source->symtab.data->d_size / symsize;
+ source->satisfied = (source_t **)CALLOC(source->num_syms,
+ sizeof(source_t *));
+ source->exports = (source_t **)CALLOC(source->num_syms,
+ sizeof(next_export_t));
+
+ source->num_exported = 0;
+ source->satisfied_execs = NULL;
+ source->num_satisfied_execs = 0;
+ source->satisfied_execs_size = 0;
+
+ add_to_sources(source);
+ return source;
+}
+
+static void destroy_source(source_t *source) {
+ FREE(source->satisfied_execs);
+ FREE(source->satisfied);
+ FREE(source->exports);
+ FREE(source->next_export);
+ FREE(source->lib_deps); /* list of library dependencies */
+ FAILIF_LIBELF(elf_end(source->elf), elf_end);
+ FAILIF(close(source->elf_fd) < 0, "Could not close file %s: %s (%d)!\n",
+ source->name, strerror(errno), errno);
+ FREE(source->name);
+ FREE(source);
+}
+
+static void print_needed_libs(source_t *source)
+{
+ size_t idx;
+ for (idx = 0; idx < source->num_lib_deps; idx++) {
+ PRINT("%s:%s\n",
+ source->name,
+ source->lib_deps[idx]->name);
+ }
+}
+
+static int is_symbol_imported(source_t *source,
+ GElf_Sym *sym,
+ size_t symidx)
+{
+ const char *symname = elf_strptr(source->elf,
+ elf_ndxscn(source->strtab.scn),
+ sym->st_name);
+
+ /* A symbol is imported by an executable or a library if it is undefined
+ and is either global or weak. There is an additional case for
+ executables that we will check below. */
+ if (sym->st_shndx == SHN_UNDEF &&
+ (GELF_ST_BIND(sym->st_info) == STB_GLOBAL ||
+ GELF_ST_BIND(sym->st_info) == STB_WEAK)) {
+ INFO("*** symbol [%s:%s] is imported (UNDEFIEND).\n",
+ source->name,
+ symname);
+ return 1;
+ }
+
+#ifdef ARM_SPECIFIC_HACKS
+ /* A symbol is imported by an executable if is marked as an undefined
+ symbol--this is standard to all ELF formats. Alternatively, according
+ to the ARM specifications, a symbol in a BSS section that is also marked
+ by an R_ARM_COPY relocation is also imported. */
+
+ if (source->elf_hdr.e_type != ET_EXEC) {
+ INFO("is_symbol_imported(): [%s] is a library, "
+ "no further checks.\n", source->name);
+ return 0;
+ }
+
+ /* Is the symbol in the BSS section, and is there a COPY relocation on
+ that symbol? */
+ INFO("*** [%s:%s] checking further to see if symbol is imported.\n",
+ source->name, symname);
+ if (sym->st_shndx < source->shnum) {
+ /* Is it the .bss section? */
+ Elf_Scn *scn = elf_getscn(source->elf, sym->st_shndx);
+ FAILIF_LIBELF(NULL == scn, elf_getscn);
+ GElf_Shdr *shdr, shdr_mem;
+ shdr = gelf_getshdr(scn, &shdr_mem);
+ FAILIF_LIBELF(NULL == shdr, gelf_getshdr);
+ if (!strcmp(".bss", elf_strptr(source->elf,
+ source->shstrndx,
+ shdr->sh_name)))
+ {
+ /* Is there an R_ARM_COPY relocation on this symbol? Iterate
+ over the list of relocation sections and scan each section for
+ an entry that matches the symbol. */
+ size_t idx;
+ for (idx = 0; idx < source->num_relocations; idx++) {
+ section_info_t *reloc = source->relocations + idx;
+ /* Does the relocation section refer to the symbol table in
+ which this symbol resides, and does it relocate the .bss
+ section? */
+ if (reloc->shdr.sh_link == elf_ndxscn(source->symtab.scn) &&
+ reloc->shdr.sh_info == sym->st_shndx)
+ {
+ /* Go over the relocations and see if any of them matches
+ our symbol. */
+ size_t nrels = reloc->shdr.sh_size / reloc->shdr.sh_entsize;
+ size_t relidx, newidx;
+ if (reloc->shdr.sh_type == SHT_REL) {
+ for (newidx = relidx = 0; relidx < nrels; ++relidx) {
+ GElf_Rel rel_mem;
+ FAILIF_LIBELF(gelf_getrel (reloc->data,
+ relidx,
+ &rel_mem) == NULL,
+ gelf_getrel);
+ if (GELF_R_TYPE(rel_mem.r_info) == R_ARM_COPY &&
+ GELF_R_SYM (rel_mem.r_info) == symidx)
+ {
+ INFO("*** symbol [%s:%s] is imported "
+ "(DEFINED, REL-COPY-RELOCATED).\n",
+ source->name,
+ symname);
+ return 1;
+ }
+ } /* for each rel entry... */
+ } else {
+ for (newidx = relidx = 0; relidx < nrels; ++relidx) {
+ GElf_Rela rel_mem;
+ FAILIF_LIBELF(gelf_getrela (reloc->data,
+ relidx,
+ &rel_mem) == NULL,
+ gelf_getrela);
+ if (GELF_R_TYPE(rel_mem.r_info) == R_ARM_COPY &&
+ GELF_R_SYM (rel_mem.r_info) == symidx)
+ {
+ INFO("*** symbol [%s:%s] is imported "
+ "(DEFINED, RELA-COPY-RELOCATED).\n",
+ source->name,
+ symname);
+ return 1;
+ }
+ } /* for each rela entry... */
+ } /* if rel else rela */
+ }
+ }
+ }
+ }
+#endif/*ARM_SPECIFIC_HACKS*/
+
+ return 0;
+}
+
+static void resolve(source_t *source) {
+ /* Iterate the symbol table. For each undefined symbol, scan the
+ list of dependencies till we find a global symbol in one of them that
+ satisfies the undefined reference. At this point, we update both the
+ satisfied[] array of the sources entry, as well as the exports array of
+ the dependency where we found the match.
+ */
+
+ GElf_Sym *sym, sym_mem;
+ size_t symidx;
+ for (symidx = 0; symidx < source->num_syms; symidx++) {
+ sym = gelf_getsymshndx(source->symtab.data,
+ NULL,
+ symidx,
+ &sym_mem,
+ NULL);
+ FAILIF_LIBELF(NULL == sym, gelf_getsymshndx);
+ if (is_symbol_imported(source, sym, symidx))
+ {
+ /* This is an undefined symbol. Go over the list of libraries
+ and look it up. */
+ size_t libidx;
+ int found = 0;
+ source_t *last_found = NULL;
+ const char *symname = elf_strptr(source->elf,
+ elf_ndxscn(source->strtab.scn),
+ sym->st_name);
+ for (libidx = 0; libidx < source->num_lib_deps; libidx++) {
+ source_t *lib = source->lib_deps[libidx];
+ int lib_symidx = hash_lookup(lib->elf,
+ lib->hash.data,
+ lib->symtab.data,
+ lib->strtab.data,
+ symname);
+ if (STN_UNDEF != lib_symidx)
+ {
+ /* We found the symbol--now check to see if it is global
+ or weak. If this is the case, then the symbol satisfies
+ the dependency. */
+ GElf_Sym *lib_sym, lib_sym_mem;
+ lib_sym = gelf_getsymshndx(lib->symtab.data,
+ NULL,
+ lib_symidx,
+ &lib_sym_mem,
+ NULL);
+ FAILIF_LIBELF(NULL == lib_sym, gelf_getsymshndx);
+
+ if(lib_sym->st_shndx != STN_UNDEF &&
+ (GELF_ST_BIND(lib_sym->st_info) == STB_GLOBAL ||
+ GELF_ST_BIND(lib_sym->st_info) == STB_WEAK))
+ {
+ /* We found the symbol! Update the satisfied array at this
+ index location. */
+ source->satisfied[symidx] = lib;
+ /* Now, link this structure into the linked list
+ corresponding to the found symbol in the library's
+ global array. */
+ if (source->num_next_export == source->next_export_size) {
+ source->next_export_size += 30;
+ source->next_export =
+ (source_t **)REALLOC(source->next_export,
+ source->next_export_size *
+ sizeof(struct next_export_t));
+ }
+ source->next_export[source->num_next_export] = lib->exports[lib_symidx];
+ lib->exports[lib_symidx].source = source;
+ lib->exports[lib_symidx].next_idx = source->num_next_export;
+
+ source->num_next_export++;
+ lib->num_exported++;
+
+ INFO("[%s:%s (index %d)] satisfied by [%s] (index %d)\n",
+ source->name,
+ symname,
+ symidx,
+ lib->name,
+ lib_symidx);
+ if (found) {
+ if (found == 1) {
+ found++;
+ ERROR("ERROR: multiple definitions found for [%s:%s]!\n",
+ source->name, symname);
+ ERROR("\tthis definition [%s]\n", lib->name);
+ }
+ ERROR("\tprevious definition [%s]\n", last_found->name);
+ }
+
+ last_found = lib;
+ if (!found) found = 1;
+ }
+ }
+ }
+ if(found == 0) {
+ ERROR("ERROR: could not find match for %s:%s.\n",
+ source->name,
+ symname);
+ }
+ } /* if we found the symbol... */
+ } /* for each symbol... */
+} /* resolve() */
+
+static void print_used_symbols(source_t *source) {
+
+ int name_len = strlen(source->name);
+ static const char ext[] = ".syms";
+ char *filter = (char *)MALLOC(name_len + sizeof(ext));
+ strcpy(filter, source->name);
+ strcpy(filter + name_len, ext);
+
+ FILE *fp = fopen(filter, "w+");
+ FAILIF(NULL == fp,
+ "Can't open %s: %s (%d)\n",
+ filter,
+ strerror(errno), errno);
+
+ /* Is anybody using the symbols defined in source? */
+
+ if (source->num_exported > 0) {
+ INFO("[%s] exports %d symbols to %d libraries and executables.\n",
+ source->name,
+ source->num_exported,
+ source->num_satisfied_execs);
+ size_t symidx;
+ for (symidx = 0; symidx < source->num_syms; symidx++) {
+ if (source->exports[symidx].source != NULL) {
+ GElf_Sym *sym, sym_mem;
+ sym = gelf_getsymshndx(source->symtab.data,
+ NULL,
+ symidx,
+ &sym_mem,
+ NULL);
+ FAILIF_LIBELF(NULL == sym, gelf_getsymshndx);
+ fprintf(fp, "%s\n", elf_strptr(source->elf,
+ elf_ndxscn(source->strtab.scn),
+ sym->st_name));
+ }
+ }
+ }
+ else if (source->num_satisfied_execs > 0) {
+
+ /* Is the source listed as a depenency on anyone? If so, then the source exports no symbols
+ to anyone, but someone lists it as a dependency, which is unnecessary, so we print a warning.
+ */
+
+ ERROR("WARNING: [%s] is listed as a dependency in: ", source->name);
+ int i;
+ for (i = 0; i < source->num_satisfied_execs; i++) {
+ ERROR(" [%s],", source->satisfied_execs[i]->name);
+ }
+ ERROR(" but none of its symbols are used!.\n");
+ }
+#if 0 /* This is not really an error--a library's symbols may not be used anyone as specified in the ELF file,
+ but someone may still open a library via dlopen().
+ */
+ else {
+ ERROR("WARNING: None of [%s]'s symbols are used by any library or executable!\n", source->name);
+ }
+#endif
+
+ fclose(fp);
+ FREE(filter);
+}
+
+static void print_symbol_references(source_t *source) {
+
+ int name_len = strlen(source->name);
+ static const char ext[] = ".info";
+ char *filter = (char *)MALLOC(name_len + sizeof(ext));
+ strcpy(filter, source->name);
+ strcpy(filter + name_len, ext);
+
+ FILE *fp = fopen(filter, "w+");
+ FAILIF(NULL == fp,
+ "Can't open %s: %s (%d)\n",
+ filter,
+ strerror(errno), errno);
+
+ if (source->num_exported > 0) {
+ size_t symidx;
+ for (symidx = 0; symidx < source->num_syms; symidx++) {
+ if (source->exports[symidx].source != NULL) {
+ const char *symname;
+ GElf_Sym *sym, sym_mem;
+ sym = gelf_getsymshndx(source->symtab.data,
+ NULL,
+ symidx,
+ &sym_mem,
+ NULL);
+ FAILIF_LIBELF(NULL == sym, gelf_getsymshndx);
+ symname = elf_strptr(source->elf,
+ elf_ndxscn(source->strtab.scn),
+ sym->st_name);
+ fprintf(fp, "%s\n", symname);
+ next_export_t *export = &source->exports[symidx];
+ while (export->source != NULL) {
+ //fprintf(stderr, "%s:%s\n", symname, export->source->name);
+ fprintf(fp, "\t%s\n", export->source->name);
+ export = &export->source->next_export[export->next_idx];
+ }
+ }
+ }
+ }
+
+ fclose(fp);
+ FREE(filter);
+}
+
+static char * find_file(const char *libname,
+ char **lib_lookup_dirs,
+ int num_lib_lookup_dirs) {
+ if (libname[0] == '/') {
+ /* This is an absolute path name--just return it. */
+ INFO("ABSOLUTE PATH: [%s].\n", libname);
+ return strdup(libname);
+ } else {
+ /* First try the working directory. */
+ int fd;
+ if ((fd = open(libname, O_RDONLY)) > 0) {
+ close(fd);
+ INFO("FOUND IN CURRENT DIR: [%s].\n", libname);
+ return strdup(libname);
+ } else {
+ /* Iterate over all library paths. For each path, append the file
+ name and see if there is a file at that place. If that fails,
+ bail out. */
+
+ char *name;
+ while (num_lib_lookup_dirs--) {
+ size_t lib_len = strlen(*lib_lookup_dirs);
+ /* one extra character for the slash, and another for the
+ terminating NULL. */
+ name = (char *)MALLOC(lib_len + strlen(libname) + 2);
+ strcpy(name, *lib_lookup_dirs);
+ name[lib_len] = '/';
+ strcpy(name + lib_len + 1, libname);
+ if ((fd = open(name, O_RDONLY)) > 0) {
+ close(fd);
+ INFO("FOUND: [%s] in [%s].\n", libname, name);
+ return name;
+ }
+ INFO("NOT FOUND: [%s] in [%s].\n", libname, name);
+ free(name);
+ }
+ }
+ }
+ return NULL;
+}
+
+static source_t* process_library(const char *libname,
+ char **lib_lookup_dirs,
+ int num_lib_lookup_dirs) {
+ source_t *source = find_source(libname, lib_lookup_dirs, num_lib_lookup_dirs);
+ if (NULL == source) {
+ INFO("Processing [%s].\n", libname);
+ char *full = find_file(libname, lib_lookup_dirs, num_lib_lookup_dirs);
+ FAILIF(NULL == full,
+ "Could not find [%s] in the current directory or in any of "
+ "the search paths!\n", libname);
+ source = init_source(full);
+ if (source) {
+ GElf_Dyn *dyn, dyn_mem;
+ size_t dynidx;
+ size_t numdyn =
+ source->dynamic.shdr.sh_size /
+ source->dynamic.shdr.sh_entsize;
+
+ for (dynidx = 0; dynidx < numdyn; dynidx++) {
+ dyn = gelf_getdyn (source->dynamic.data,
+ dynidx,
+ &dyn_mem);
+ FAILIF_LIBELF(NULL == dyn, gelf_getdyn);
+ if (dyn->d_tag == DT_NEEDED) {
+ /* Process the needed library recursively. */
+ const char *dep_lib =
+ elf_strptr (source->elf,
+ source->dynamic.shdr.sh_link,
+ dyn->d_un.d_val);
+ INFO("[%s] depends on [%s].\n", libname, dep_lib);
+ source_t *dep = process_library(dep_lib,
+ lib_lookup_dirs,
+ num_lib_lookup_dirs);
+
+ /* Tell dep that source depends on it. */
+ if (dep->num_satisfied_execs == dep->satisfied_execs_size) {
+ dep->satisfied_execs_size += 10;
+ dep->satisfied_execs =
+ REALLOC(dep->satisfied_execs,
+ dep->satisfied_execs_size *
+ sizeof(source_t *));
+ }
+ dep->satisfied_execs[dep->num_satisfied_execs++] = source;
+
+ /* Add the library to the dependency list. */
+ if (source->num_lib_deps == source->lib_deps_size) {
+ source->lib_deps_size += 10;
+ source->lib_deps = REALLOC(source->lib_deps,
+ source->lib_deps_size *
+ sizeof(source_t *));
+ }
+ source->lib_deps[source->num_lib_deps++] = dep;
+ }
+ } /* for each dynamic entry... */
+ }
+ } else INFO("[%s] has been processed already.\n", libname);
+
+ return source;
+}
+
+void lsd(char **execs, int num_execs,
+ int list_needed_libs,
+ int print_info,
+ char **lib_lookup_dirs, int num_lib_lookup_dirs) {
+
+ source_t *source; /* for general usage */
+ int input_idx;
+
+ for (input_idx = 0; input_idx < num_execs; input_idx++) {
+ INFO("executable: [%s]\n", execs[input_idx]);
+ /* Here process library is actually processing the top-level executable
+ files. */
+ process_library(execs[input_idx], lib_lookup_dirs, num_lib_lookup_dirs);
+ /* if source is NULL, then the respective executable is static */
+ /* Mark the source as an executable */
+ } /* for each input executable... */
+
+ if (list_needed_libs) {
+ source = sources;
+ while (source) {
+ print_needed_libs(source);
+ source = source->next;
+ }
+ }
+
+ /* Now, for each entry in the sources array, iterate its symbol table. For
+ each undefined symbol, scan the list of dependencies till we find a
+ global symbol in one of them that satisfies the undefined reference.
+ At this point, we update both the satisfied[] array of the sources entry,
+ as well as the exports array of the dependency where we found the match.
+ */
+
+ source = sources;
+ while (source) {
+ resolve(source);
+ source = source->next;
+ }
+
+ /* We are done! Since the end result of our calculations is a set of
+ symbols for each library that other libraries or executables link
+ against, we iterate over the set of libraries one last time, and for
+ each symbol that is marked as satisfying some dependence, we emit
+ a line with the symbol's name to a text file derived from the library's
+ name by appending the suffix .syms to it. */
+
+ source = sources;
+ while (source) {
+ /* If it's a library, print the results. */
+ if (source->elf_hdr.e_type == ET_DYN) {
+ print_used_symbols(source);
+ if (print_info)
+ print_symbol_references(source);
+ }
+ source = source->next;
+ }
+
+ /* Free the resources--you can't do it in the loop above because function
+ print_symbol_references() accesses nodes other than the one being
+ iterated over.
+ */
+ source = sources;
+ while (source) {
+ source_t *old = source;
+ source = source->next;
+ /* Destroy the evidence. */
+ destroy_source(old);
+ }
+}
+