126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
// Type infos and methods for Pointer types
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#include <ctype.h>
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#include <err.h>
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#include <gc.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include "integers.h"
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#include "metamethods.h"
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#include "tables.h"
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#include "text.h"
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#include "types.h"
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#include "util.h"
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public Text_t Pointer$as_text(const void *x, bool colorize, const TypeInfo_t *type) {
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auto ptr_info = type->PointerInfo;
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if (!x) {
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Text_t typename = generic_as_text(NULL, false, ptr_info.pointed);
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Text_t text;
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if (colorize)
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text = Text$concat(Text("\x1b[34;1m"), Text$from_str(ptr_info.sigil), typename, Text("\x1b[m"));
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else
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text = Text$concat(Text$from_str(ptr_info.sigil), typename);
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return text;
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}
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const void *ptr = *(const void**)x;
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if (!ptr) {
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Text_t typename = generic_as_text(NULL, false, ptr_info.pointed);
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if (colorize)
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return Text$concat(Text("\x1b[34;1m!"), typename, Text("\x1b[m"));
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else
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return Text$concat(Text("!"), typename);
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}
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static const void *root = NULL;
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static Table_t pending = {};
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bool top_level = (root == NULL);
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// Check for recursive references, so if `x.foo = x`, then it prints as
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// `@Foo{foo=@~1}` instead of overflowing the stack:
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if (top_level) {
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root = ptr;
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} else if (ptr == root) {
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return Text$format(colorize ? "\x1b[34;1m%s~1\x1b[m" : "%s~1", ptr_info.sigil);
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} else {
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TypeInfo_t rec_table = *Table$info(type, &Int64$info);
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int64_t *id = Table$get(pending, x, &rec_table);
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if (id)
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return Text$format(colorize ? "\x1b[34;1m%s~%ld\x1b[m" : "%s~%ld", ptr_info.sigil, *id);
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int64_t next_id = pending.entries.length + 2;
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Table$set(&pending, x, &next_id, &rec_table);
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}
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Text_t pointed = generic_as_text(ptr, colorize, ptr_info.pointed);
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if (top_level) {
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pending = (Table_t){}; // Restore
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root = NULL;
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}
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Text_t text;
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if (colorize)
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text = Text$concat(Text("\x1b[34;1m"), Text$from_str(ptr_info.sigil), Text("\x1b[m"), pointed);
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else
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text = Text$concat(Text$from_str(ptr_info.sigil), pointed);
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return text;
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}
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PUREFUNC public int32_t Pointer$compare(const void *x, const void *y, const TypeInfo_t*) {
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const void *xp = *(const void**)x, *yp = *(const void**)y;
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return (xp > yp) - (xp < yp);
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}
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PUREFUNC public bool Pointer$equal(const void *x, const void *y, const TypeInfo_t*) {
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const void *xp = *(const void**)x, *yp = *(const void**)y;
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return xp == yp;
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}
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PUREFUNC public bool Pointer$is_none(const void *x, const TypeInfo_t*)
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{
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return *(void**)x == NULL;
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}
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public void Pointer$serialize(const void *obj, FILE *out, Table_t *pointers, const TypeInfo_t *type)
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{
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void *ptr = *(void**)obj;
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assert(ptr != NULL);
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const TypeInfo_t ptr_to_int_table = {.size=sizeof(Table_t), .align=__alignof__(Table_t),
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.tag=TableInfo, .TableInfo.key=type, .TableInfo.value=&Int64$info};
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int64_t *id_ptr = Table$get(*pointers, &ptr, &ptr_to_int_table);
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int64_t id;
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if (id_ptr) {
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id = *id_ptr;
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} else {
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id = pointers->entries.length + 1;
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Table$set(pointers, &ptr, &id, &ptr_to_int_table);
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}
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Int64$serialize(&id, out, pointers, &Int64$info);
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if (!id_ptr)
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_serialize(ptr, out, pointers, type->PointerInfo.pointed);
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}
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public void Pointer$deserialize(FILE *in, void *outval, Array_t *pointers, const TypeInfo_t *type)
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{
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int64_t id = 0;
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Int64$deserialize(in, &id, pointers, &Int64$info);
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assert(id != 0);
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if (id > pointers->length) {
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void *obj = GC_MALLOC((size_t)type->PointerInfo.pointed->size);
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Array$insert(pointers, &obj, I(0), sizeof(void*));
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_deserialize(in, obj, pointers, type->PointerInfo.pointed);
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*(void**)outval = obj;
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} else {
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*(void**)outval = *(void**)(pointers->data + (id-1)*pointers->stride);
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}
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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