50 lines
1.1 KiB
Plaintext
50 lines
1.1 KiB
Plaintext
// rt/append.ww — slice runtime helpers, archived into libwwrt.a.
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//
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// The compiler lowers `append(s, v)` to a CALL to one of these by
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// element size (1 byte → appendu8, else → appendi64). User code
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// never `use`s this — the symbol comes in via the runtime archive,
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// like rt_alloc and rt_streq.
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@symbol("rt_alloc") fn alloc(n: u64) *void;
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@symbol("rt_free") fn free(p: *void, n: u64) void;
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export fn appendu8(s: *[]u8, v: u8) void = {
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if (s.len >= s.cap) {
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let nc: i32 = s.cap * 2;
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if (nc < 8) { nc = 8; };
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let np: *u8 = alloc(nc: u64): *u8;
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let i: i32 = 0;
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for (i < s.len) {
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np[i] = s.ptr[i];
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i += 1;
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};
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if (s.cap > 0) {
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free(s.ptr: *void, s.cap: u64);
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};
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s.ptr = np;
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s.cap = nc;
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};
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s.ptr[s.len] = v;
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s.len += 1;
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};
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export fn appendi64(s: *[]i64, v: i64) void = {
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if (s.len >= s.cap) {
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let nc: i32 = s.cap * 2;
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if (nc < 8) { nc = 8; };
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let np: *i64 = alloc((nc * 8): u64): *i64;
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let i: i32 = 0;
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for (i < s.len) {
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np[i] = s.ptr[i];
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i += 1;
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};
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if (s.cap > 0) {
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free(s.ptr: *void, (s.cap * 8): u64);
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};
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s.ptr = np;
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s.cap = nc;
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};
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s.ptr[s.len] = v;
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s.len += 1;
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};
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