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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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2
libc/elf/getelfprogramheaderaddress.c
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@ -31,7 +31,7 @@
Elf64_Phdr *GetElfProgramHeaderAddress(const Elf64_Ehdr *elf, //
size_t mapsize, //
Elf64_Half i) { //
uint64_t off;
Elf64_Off off;
if (i >= elf->e_phnum) return 0;
if (elf->e_phoff <= 0) return 0;
if (elf->e_phoff >= mapsize) return 0;