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Add support for symbol table in .com files

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This change fixes minor bugs and adds a feature, which lets us store the
ELF symbol table, inside the ZIP directory. We use the path /zip/.symtab
which can be safely removed using a zip editing tool, to make the binary
smaller after compilation. This supplements the existing method of using
a separate .com.dbg file, which is still supported. The intent is people
don't always know that it's a good idea to download the debug file. It's
not great having someone's first experience be a crash report, that only
has numbers rather than symbols. This will help fix that!
This commit is contained in:
Justine Tunney 2022-03-23 06:31:55 -07:00
parent 393ca4be40
commit 23b72eb617
61 changed files with 963 additions and 510 deletions
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23
libc/runtime/symbols.internal.h
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@ -1,21 +1,30 @@
#ifndef COSMOPOLITAN_LIBC_SYMBOLS_H_
#define COSMOPOLITAN_LIBC_SYMBOLS_H_
#include "libc/bits/bits.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define SYMBOLS_MAGIC READ32LE("SYMT")
#define SYMBOLS_ABI 1
struct Symbol {
unsigned x; /* start (relative to addr_base) */
unsigned y; /* start + size - 1 (inclusive) */
};
struct SymbolTable {
size_t count; /* of `symbols` */
size_t mapsize; /* of this object */
intptr_t addr_base; /* IMAGE_BASE_VIRTUAL */
intptr_t addr_end; /* _end - 1 */
unsigned *names; /* relative to `name_base` */
char *name_base; /* double-nul terminated w/ empty first */
struct Symbol symbols[]; /* sorted and non-overlapping intervals */
uint32_t magic; /* 0xFEEDABEE little endian */
uint32_t abi; /* 1 */
uint64_t count; /* of `symbols` */
uint64_t size; /* file size */
uint64_t mapsize; /* of this object */
int64_t addr_base; /* IMAGE_BASE_VIRTUAL */
int64_t addr_end; /* _end - 1 */
uint32_t *names; /* relative to `name_base` */
char *name_base; /* double-nul terminated w/ empty first */
uint32_t names_offset; /* for file loading */
uint32_t name_base_offset; /* for file loading */
struct Symbol symbols[]; /* sorted and non-overlapping intervals */
};
struct SymbolTable *GetSymbolTable(void);