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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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7
tool/decode/elf.c
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@ -20,6 +20,7 @@
#include "libc/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/elf/def.h"
#include "libc/elf/elf.h"
#include "libc/elf/struct/rela.h"
#include "libc/elf/struct/shdr.h"
#include "libc/errno.h"
@ -273,8 +274,7 @@ static void printelfsymbol(Elf64_Sym *sym, char *strtab, char *shstrtab) {
static void printelfsymboltable(void) {
size_t i, symcount = 0;
Elf64_Sym *symtab =
GetElfSymbolTable(elf, st->st_size, SHT_SYMTAB, &symcount);
Elf64_Sym *symtab = GetElfSymbols(elf, st->st_size, SHT_SYMTAB, &symcount);
if (!symtab) return;
char *strtab = GetElfStringTable(elf, st->st_size, ".strtab");
char *shstrtab = GetElfSectionNameStringTable(elf, st->st_size);
@ -290,8 +290,7 @@ static void printelfsymboltable(void) {
static void printelfdynsymboltable(void) {
size_t i, symcount = 0;
Elf64_Sym *symtab =
GetElfSymbolTable(elf, st->st_size, SHT_DYNSYM, &symcount);
Elf64_Sym *symtab = GetElfSymbols(elf, st->st_size, SHT_DYNSYM, &symcount);
if (!symtab) return;
char *strtab = GetElfStringTable(elf, st->st_size, ".dynstr");
char *shstrtab = GetElfSectionNameStringTable(elf, st->st_size);