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ed
2026-08-13 02:13:47 -04:00
parent d5f28b83ea
commit 7f0bdefbcb
7 changed files with 155 additions and 58 deletions
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code/duffle/memory.h
+12 -5
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@@ -18,7 +18,7 @@ I_ U4 align_pow2(U4 x, U4 b) {
#define align_struct(type_width) ((U4)(((type_width) + 3) & ~3))
FI_ void mem_bump(U4 start, U4 cap, U4*R_ used, U4 amount) {
FI_ void mem_bump(U4 cap, U4*R_ used, U4 amount) {
assert(amount <= (cap - used[0]));
used[0] += amount;
}
@@ -72,7 +72,7 @@ typedef Slice_(B1);
#define slice_to_ut(s) slice_ut_(u4_((s).ptr), S_slice(s))
#define slice_iter(container, iter) (T_((container).ptr) iter = (container).ptr; iter != slice_end(container); ++ iter)
#define slice_arg_from_array(type, ...) & (tmpl(Slice,type)) { .ptr = array_decl(type,__VA_ARGS__), .len = array_len( array_decl(type,__VA_ARGS__)) }
#define slice_arg_from_array(type, ...) & (tmpl(Slice,type)) { .ptr = Array_decl(type,__VA_ARGS__), .len = Array_len( Array_decl(type,__VA_ARGS__)) }
#define slice_from_array(type, array) (tmpl(Slice,type)) { .ptr = array, .len = S_(array) / S_(type) }
FI_ void slice_zero_(Slice s) { slice_assert(s); mem_zero(u4_(s.ptr), s.len); }
@@ -89,6 +89,12 @@ FI_ void slice_copy_(Slice dest, Slice src) {
slice_copy_(slice_to_ut(dest), slice_to_ut(src)); \
} while(0)
FI_ Slice slice_bump(U4_R used, U4 start, U4 len, U4 amount) {
assert(len - used[0] - amount);
U4 ptr = start + used[0]; used[0] += amount;
return slice_ut(ptr, amount);
}
typedef Slice_(U1);
typedef Slice_(U4);
@@ -104,12 +110,13 @@ FI_ void farena_init(FArena_R arena, Slice mem) { assert(arena != nullptr);
arena->used = 0;
}
FI_ FArena farena_make(Slice mem) { FArena a; farena_init(& a, mem); return a; }
I_ Slice farena_push(FArena_R arena, U4 amount, Opt_farena o) {
FI_ Slice farena_bump(FArena_R a, U4 amount) { return slice_bump(& a->used, a->start, a->capacity, amount); }
I_ Slice farena_push(FArena_R arena, U4 amount, Opt_farena o) {
if (amount == 0) { return (Slice){}; }
U4 desired = amount * (o.type_width == 0 ? 1 : o.type_width);
U4 to_commit = align_pow2(desired, o.alignment ? o.alignment : MEM_ALIGNMENT_DEFAULT);
U4 ptr = arena->start + arena->used;
mem_bump(arena->start, arena->capacity, & arena->used, to_commit);
mem_bump(arena->capacity, & arena->used, to_commit);
return (Slice){ (B1*)ptr, to_commit };
}
FI_ void farena_reset (FArena_R arena) { arena->used = 0; }
@@ -117,7 +124,7 @@ FI_ void farena_rewind(FArena_R arena, U4 save_point) {
U4 end = arena->start + arena->used; assert_bounds(save_point, arena->start, end);
arena->used -= save_point - arena->start;
}
FI_ U4 farena_save(FArena arena) { return arena.used; }
FI_ U4 farena_save(FArena arena) { return arena.used; }
FI_ U4 farena_unused_start(FArena arena) { return arena.start + arena.used; }
#define farena_push_(arena, amount, ...) farena_push((arena), (amount), opt_(farena, __VA_ARGS__))
#define farena_push_type(arena, type, ...) C_(type*, farena_push((arena), 1, opt_(farena, .type_width=S_(type), __VA_ARGS__)).ptr)