Hojun-Cho
2c33228b7e
Plan 9-style w-prefix on the per-arch tools, disambiguating from the
real Plan 9 6c/6a/6l in ref/plan9front/:
cmd/wwc/ → cmd/wcc/ libwwc.a → libwcc.a
cmd/6{c,a,l} → cmd/w6{c,a,l} binary names too
test/wwc/ → test/wcc/ 6 test files w/ w6 prefix
selfhost/cmd mirror in lockstep
bootstrap/amd64/{w6c,w6a,w6l} snapshot binaries (gitignored)
WW_6{C,A,L} → WW_W6{C,A,L} env-var overrides
Plan 9 source-tree refs ("Plan 9 6c shape", ref/plan9front/, etc.)
preserved. Hare-style driver, both C and ww sides:
ww test [path] discover *_test.ww in a directory module, run
each; single-file mode for `ww test foo.ww`
Module-by-name `ww build foo` resolves to foo.ww or foo/foo.ww
via search path (cwd : -I dirs : $WW_LIB)
Default-to-cwd `ww build` / `ww test` build the cwd module
Run pass-through `ww run path arg1 arg2` reaches the program
lib/os: getcwd (79) and getdents64 (217) syscalls power `.` resolution
and directory enumeration on the ww side.
Makefile: wwstage tool deps now include lib/os/os.ww (+ lib/strconv
for wwdump_ww) so lib/* edits force their rebuild instead of leaving
stale binaries — surfaced when test 995 first failed against a stale
w6c_ww built before the lib/os additions.
Test 993 byte-identical parity gate (C-side ww vs ww-side ww_ww on a
build corpus) stays green; all 19 tests pass.
118 lines
2.2 KiB
C
118 lines
2.2 KiB
C
/*
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* mem.c — arena allocator. No free per allocation; freearena releases
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* the whole chain. Aligned to 16 so structs with 8-byte fields and
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* doubles are happy.
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*
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* Hot allocations in the compiler land in arenas: tokens, AST nodes,
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* symbols, types. The chunk size doubles up to a cap so we don't
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* fragment on huge inputs.
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*/
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#include "ww.h"
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#include <stdlib.h>
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#include <string.h>
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#define ALIGN 16
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#define INIT_CHUNK (64 * 1024)
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#define MAX_CHUNK (4 * 1024 * 1024)
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static u64
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roundup(u64 n, u64 a)
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{
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return (n + a - 1) & ~(a - 1);
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}
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Arena *
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newarena(void)
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{
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Arena *a = calloc(1, sizeof *a);
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if (a == NULL)
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fatal("newarena: out of memory");
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a->buf = malloc(INIT_CHUNK);
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if (a->buf == NULL)
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fatal("newarena: out of memory");
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a->cap = INIT_CHUNK;
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return a;
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}
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static void
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grow(Arena *a, u64 need)
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{
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u64 ncap = a->cap * 2;
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if (ncap > MAX_CHUNK)
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ncap = MAX_CHUNK;
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if (ncap < need)
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ncap = roundup(need, ALIGN);
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/* push current chunk onto chain, allocate fresh head */
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Arena *old = malloc(sizeof *old);
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if (old == NULL)
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fatal("arena: oom");
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*old = *a;
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a->next = old;
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a->buf = malloc(ncap);
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if (a->buf == NULL)
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fatal("arena: oom (chunk=%llu)", (unsigned long long)ncap);
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a->off = 0;
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a->cap = ncap;
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}
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void *
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amalloc(Arena *a, u64 n)
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{
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n = roundup(n, ALIGN);
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if (n > a->cap - a->off)
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grow(a, n);
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void *p = a->buf + a->off;
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a->off += n;
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a->total += n;
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memset(p, 0, n);
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return p;
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}
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char *
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astrdup(Arena *a, const char *s)
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{
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u64 n = strlen(s);
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char *p = amalloc(a, n + 1);
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memcpy(p, s, n);
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return p;
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}
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char *
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astrndup(Arena *a, const char *s, u64 n)
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{
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char *p = amalloc(a, n + 1);
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memcpy(p, s, n);
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return p;
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}
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char *
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aprintf(Arena *a, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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int n = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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if (n < 0)
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fatal("aprintf: vsnprintf failed");
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char *p = amalloc(a, (u64)n + 1);
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va_start(ap, fmt);
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vsnprintf(p, (size_t)n + 1, fmt, ap);
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va_end(ap);
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return p;
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}
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void
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freearena(Arena *a)
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{
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while (a) {
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Arena *next = a->next;
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free(a->buf);
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/* The head Arena was returned by newarena() and is the only
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* one we should free as a struct; the linked older ones were
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* allocated by grow() and are also freeable. */
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free(a);
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a = next;
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}
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}
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