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Rewrite Cosmopolitan Ar

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The build/bootstrap/ar.com program is now tinier. This change reduces
its size from 140kb to 53kb. Nothing was traded away. Cosmopolitan Ar
performance is now 2x better than llvm-ar largely thanks to using the
copy_file_range() system call. This change homebrews a new allocation
API that addresses the shortcomings of the C standard library design.
Using these new balloc() and reballoc() functions I managed to reduce
memory consumption so much that Cosmpolitan Ar should now use roughly
100x fewer bytes of peak resident memory compared to llvm-ar. Correct
behavior with better compatibility has been assured. Binary output is
now pretty much bit-identical to llvm-ar, as of this change. This can
and should be the living proof we need to show that a better world is
possible for software.
This commit is contained in:
Justine Tunney 2023-07-02 10:19:16 -07:00
parent 197aa0d465
commit 0c630d95b5
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GPG key ID: BE714B4575D6E328
27 changed files with 916 additions and 341 deletions
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11
libc/elf/elf.h
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@ -11,16 +11,17 @@ COSMOPOLITAN_C_START_
│ cosmopolitan § executable linkable format ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
char *GetElfStringTable(const Elf64_Ehdr *, size_t, const char *);
Elf64_Sym *GetElfSymbolTable(const Elf64_Ehdr *, size_t, int, Elf64_Xword *);
bool IsElf64Binary(const Elf64_Ehdr *, size_t);
bool IsElfSymbolContent(const Elf64_Sym *);
bool IsElf64Binary(const Elf64_Ehdr *, size_t);
char *GetElfStringTable(const Elf64_Ehdr *, size_t, const char *);
Elf64_Sym *GetElfSymbols(const Elf64_Ehdr *, size_t, int, Elf64_Xword *);
Elf64_Shdr *GetElfSymbolTable(const Elf64_Ehdr *, size_t, int, Elf64_Xword *);
Elf64_Phdr *GetElfProgramHeaderAddress(const Elf64_Ehdr *, size_t, Elf64_Half);
Elf64_Shdr *GetElfSectionHeaderAddress(const Elf64_Ehdr *, size_t, Elf64_Half);
const char *GetElfString(const Elf64_Ehdr *, size_t, const char *, Elf64_Word);
void *GetElfSectionAddress(const Elf64_Ehdr *, size_t, const Elf64_Shdr *);
char *GetElfSectionNameStringTable(const Elf64_Ehdr *, size_t);
char *GetElfString(const Elf64_Ehdr *, size_t, const char *, Elf64_Word);
const char *GetElfSectionName(const Elf64_Ehdr *, size_t, Elf64_Shdr *);
char *GetElfSectionNameStringTable(const Elf64_Ehdr *, size_t);
#endif /* COSMO */
COSMOPOLITAN_C_END_