毕业设计代做网站php,全渠道营销成功案例,中山手机网站制作哪家好,东台做网站的一、ldemul_create_output_section_statements()
位于lang_process()中11行 。 该函数用于创建与目标有关的输出段的语句。这些语句将用于描述输出段的属性和分配。
void
ldemul_create_output_section_statements (void)
{if (ld_emulation-create_output_section_sta…一、ldemul_create_output_section_statements()
位于lang_process()中11行 。 该函数用于创建与目标有关的输出段的语句。这些语句将用于描述输出段的属性和分配。
void
ldemul_create_output_section_statements (void)
{if (ld_emulation-create_output_section_statements)ld_emulation-create_output_section_statements ();
}static ld_emulation_xfer_type *ld_emulation; /* Create any output sections needed by the target. */void (*create_output_section_statements) (void); // 14
typedef struct ld_emulation_xfer_struct {/* Run before parsing the command line and script file.Set the architecture, maybe other things. */void (*before_parse) (void); // 1/* Handle the SYSLIB (low level library) script command. */void (*syslib) (char *); // 2/* Handle the HLL (high level library) script command. */void (*hll) (char *); // 3/* Run after parsing the command line and script file. */void (*after_parse) (void); // 4/* Run after opening all input files, and loading the symbols. */void (*after_open) (void); // 5/* Run after allocating output sections. */void (*after_allocation) (void); // 6/* Set the output architecture and machine if possible. */void (*set_output_arch) (void); // 7/* Decide which target name to use. */char * (*choose_target) (int, char**); // 8/* Run before allocating output sections. */void (*before_allocation) (void); // 9/* Return the appropriate linker script. */char * (*get_script) (int *isfile); // 10/* The name of this emulation. */char *emulation_name; // 11/* The output format. */char *target_name; // 12/* Run after assigning values from the script. */void (*finish) (void); // 13/* Create any output sections needed by the target. */void (*create_output_section_statements) (void); // 14/* Try to open a dynamic library. ARCH is an architecture name, andis normally the empty string. ENTRY is the lang_input_statementthat should be opened. */bfd_boolean (*open_dynamic_archive)(const char *arch, struct search_dirs *,struct lang_input_statement_struct *entry); // 15/* Place an orphan section. Return TRUE if it was placed, FALSE ifthe default action should be taken. This field may be NULL, inwhich case the default action will always be taken. */lang_output_section_statement_type *(*place_orphan)(asection *, const char *, int); // 16/* Run after assigning parsing with the args, but beforereading the script. Used to initialize symbols used in the script. */void (*set_symbols) (void); // 17/* Parse args which the base linker doesnt understand.Return TRUE if the arg needs no further processing. */bfd_boolean (*parse_args) (int, char **); // 18/* Hook to add options to parameters passed by the base linker togetopt_long and getopt_long_only calls. */void (*add_options)(int, char **, int, struct option **, int, struct option **); // 19/* Companion to the above to handle an option. Returns TRUE if it isone of our options. */bfd_boolean (*handle_option) (int); // 20/* Run to handle files which are not recognized as object files orarchives. Return TRUE if the file was handled. */bfd_boolean (*unrecognized_file)(struct lang_input_statement_struct *); // 21/* Run to list the command line options which parse_args handles. */void (* list_options) (FILE *); // 22/* Run to specially handle files which *are* recognized as objectfiles or archives. Return TRUE if the file was handled. */bfd_boolean (*recognized_file)(struct lang_input_statement_struct *); // 23/* Called when looking for libraries in a directory specifiedvia a linker command line option or linker script option.Files that match the pattern lib*.a have already been scanned.(For VMS files matching :lib*.a have also been scanned). */int (* find_potential_libraries)(char *, struct lang_input_statement_struct *); // 24/* Called when adding a new version pattern. PowerPC64-ELF usesthis hook to add a pattern matching .foo for every foo. */struct bfd_elf_version_expr * (*new_vers_pattern)(struct bfd_elf_version_expr *); // 25/* Called when printing the map file, in case there areemulation-specific sections for it. */void (*extra_map_file_text)(bfd *, struct bfd_link_info *, FILE *); // 26} ld_emulation_xfer_type;
二、lang_place_undefineds () 将命令行中所有未定义的符号加入哈希表中 结构体类型
struct bfd_sym_chain
这是一个结构体定义表示符号链的链接列表节点。每个节点包含指向下一个节点的指针和指向字符字符串的指针可能是符号名称。 typedef struct bfd_sym_chain ldlang_undef_chain_list_type 这行代码为struct bfd_sym_chain创建了类型别名ldlang_undef_chain_list_type以便更容易使用和声明这种类型的变量。 #define ldlang_undef_chain_list_head entry_symbol.next 这似乎是一个预处理器宏将ldlang_undef_chain_list_head定义为entry_symbol.next。它可能用作访问符号链节点的next字段的简写。
struct bfd_sym_chain
{struct bfd_sym_chain *next;const char *name;
};typedef struct bfd_sym_chain ldlang_undef_chain_list_type;#define ldlang_undef_chain_list_head entry_symbol.next
函数
static void lang_place_undefineds(void)
这是一个函数定义的开始名为lang_place_undefineds。它是一个静态函数意味着它仅限于当前的翻译单元。这个函数的目的是遍历未定义符号ldlang_undef_chain_list_type的列表并为每个符号的名称调用insert_undefined。
static void
lang_place_undefineds (void)
// /* Add to the hash table all undefineds on the command line. */
{ldlang_undef_chain_list_type *ptr;for (ptr ldlang_undef_chain_list_head; ptr ! NULL; ptr ptr-next)insert_undefined (ptr-name);
}
static void insert_undefined(const char *name)
这是另一个静态函数定义名为insert_undefined。它以字符串name作为参数。这个函数的目的是将未定义符号插入符号表中。它首先使用bfd_link_hash_lookup在哈希表中查找符号如果找不到则使用bfd_link_add_undef添加它。 /* Insert NAME as undefined in the symbol table. */static void
insert_undefined (const char *name)
{struct bfd_link_hash_entry *h;h bfd_link_hash_lookup (link_info.hash, name, TRUE, FALSE, TRUE);if (h NULL)einfo (_(%P%F: bfd_link_hash_lookup failed: %E\n));if (h-type bfd_link_hash_new){h-type bfd_link_hash_undefined;h-u.undef.abfd NULL;bfd_link_add_undef (link_info.hash, h);}
}
bfd_link_hash_lookup和bfd_hash_lookup函数
这些函数用于在哈希表中查找条目。bfd_link_hash_lookup似乎用于在符号哈希表中查找条目而bfd_hash_lookup是一个更一般的哈希表查找函数。这些函数通过对输入字符串进行哈希并在哈希表中搜索相应的条目来工作。 bfd_hash_insert函数 此函数用于将新条目插入哈希表。它为条目分配内存计算哈希值并将条目插入哈希表的适当位置。如果需要它还处理表的大小调整。
struct bfd_link_hash_entry *
bfd_link_hash_lookup (struct bfd_link_hash_table *table,const char *string,bfd_boolean create, // Tbfd_boolean copy, // Fbfd_boolean follow) // T
{struct bfd_link_hash_entry *ret;ret ((struct bfd_link_hash_entry *)bfd_hash_lookup (table-table, string, create, copy));if (follow ret ! NULL){while (ret-type bfd_link_hash_indirect|| ret-type bfd_link_hash_warning)ret ret-u.i.link;}return ret;
}
struct bfd_hash_entry *
bfd_hash_lookup (struct bfd_hash_table *table,const char *string,bfd_boolean create, // Tbfd_boolean copy) // F
{unsigned long hash;struct bfd_hash_entry *hashp;unsigned int len;unsigned int _index;hash bfd_hash_hash (string, len);_index hash % table-size;for (hashp table-table[_index];hashp ! NULL;hashp hashp-next){if (hashp-hash hash strcmp (hashp-string, string) 0)return hashp;}if (! create)return NULL;if (copy){char *new_string;new_string (char *) objalloc_alloc ((struct objalloc *) table-memory,len 1);if (!new_string){bfd_set_error (bfd_error_no_memory);return NULL;}memcpy (new_string, string, len 1);string new_string;}return bfd_hash_insert (table, string, hash);
}
struct bfd_hash_entry *
bfd_hash_insert (struct bfd_hash_table *table,const char *string,unsigned long hash)
{struct bfd_hash_entry *hashp;unsigned int _index;hashp (*table-newfunc) (NULL, table, string);if (hashp NULL)return NULL;hashp-string string;hashp-hash hash;_index hash % table-size;hashp-next table-table[_index];table-table[_index] hashp;table-count;if (!table-frozen table-count table-size * 3 / 4){unsigned long newsize higher_prime_number (table-size);struct bfd_hash_entry **newtable;unsigned int hi;unsigned long alloc newsize * sizeof (struct bfd_hash_entry *);/* If we cant find a higher prime, or we cant possibly allocthat much memory, dont try to grow the table. */if (newsize 0 || alloc / sizeof (struct bfd_hash_entry *) ! newsize){table-frozen 1;return hashp;}newtable ((struct bfd_hash_entry **)objalloc_alloc ((struct objalloc *) table-memory, alloc));if (newtable NULL){table-frozen 1;return hashp;}memset (newtable, 0, alloc);for (hi 0; hi table-size; hi )while (table-table[hi]){struct bfd_hash_entry *chain table-table[hi];struct bfd_hash_entry *chain_end chain;while (chain_end-next chain_end-next-hash chain-hash)chain_end chain_end-next;table-table[hi] chain_end-next;_index chain-hash % newsize;chain_end-next newtable[_index];newtable[_index] chain;}table-table newtable;table-size newsize;}return hashp;
}
