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https://github.com/jart/cosmopolitan.git
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b01282e23e
This reduces the virtual memory usage of Emacs for me by 30%. We now have a simpler implementation that uses read(), rather mmap()ing the whole executable.
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_SYMBOLS_H_
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#define COSMOPOLITAN_LIBC_SYMBOLS_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define SYMBOLS_MAGIC 0x544d5953 /* SYMT */
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#define SYMBOLS_ABI 1
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struct Symbol {
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unsigned x; /* start (relative to addr_base) */
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unsigned y; /* start + size - 1 (inclusive) */
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};
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struct SymbolTable {
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uint32_t magic; /* 0xFEEDABEE little endian */
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uint32_t abi; /* 1 */
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uint64_t count; /* of `symbols` */
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uint64_t size; /* file size */
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uint64_t mapsize; /* of this object */
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int64_t addr_base; /* IMAGE_BASE_VIRTUAL */
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int64_t addr_end; /* _end - 1 */
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uint32_t *names; /* relative to `name_base` */
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char *name_base; /* double-nul terminated w/ empty first */
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uint32_t names_offset; /* for file loading */
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uint32_t name_base_offset; /* for file loading */
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struct Symbol symbols[]; /* sorted and non-overlapping intervals */
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};
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struct SymbolTableLoader {
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_Atomic(unsigned) once;
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struct SymbolTable *st;
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};
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extern struct SymbolTableLoader __symtab;
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struct SymbolTable *GetSymbolTable(void);
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const char *FindComBinary(void);
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const char *FindDebugBinary(void);
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struct SymbolTable *OpenSymbolTable(const char *);
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int CloseSymbolTable(struct SymbolTable **);
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int __hook(void *, struct SymbolTable *);
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int __get_symbol(struct SymbolTable *, intptr_t);
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char *__get_symbol_name(struct SymbolTable *, int);
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_SYMBOLS_H_ */
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