127 lines
3.0 KiB
C++
127 lines
3.0 KiB
C++
#include "master.hpp"
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namespace factor
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{
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/* Allocates memory */
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string *factor_vm::allot_string_internal(cell capacity)
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{
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string *str = allot<string>(string_size(capacity));
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str->length = tag_fixnum(capacity);
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str->hashcode = false_object;
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str->aux = false_object;
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return str;
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}
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/* Allocates memory */
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void factor_vm::fill_string(string *str_, cell start, cell capacity, cell fill)
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{
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data_root<string> str(str_,this);
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if(fill <= 0x7f)
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memset(&str->data()[start],(u8)fill,capacity - start);
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else
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{
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byte_array *aux;
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if(to_boolean(str->aux))
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aux = untag<byte_array>(str->aux);
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else
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{
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aux = allot_uninitialized_array<byte_array>(untag_fixnum(str->length) * 2);
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str->aux = tag<byte_array>(aux);
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write_barrier(&str->aux);
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}
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u8 lo_fill = (u8)((fill & 0x7f) | 0x80);
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u16 hi_fill = (u16)((fill >> 7) ^ 0x1);
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memset(&str->data()[start],lo_fill,capacity - start);
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memset_2(&aux->data<u16>()[start],hi_fill,(capacity - start) * sizeof(u16));
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}
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}
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/* Allocates memory */
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string *factor_vm::allot_string(cell capacity, cell fill)
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{
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data_root<string> str(allot_string_internal(capacity),this);
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fill_string(str.untagged(),0,capacity,fill);
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return str.untagged();
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}
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/* Allocates memory */
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void factor_vm::primitive_string()
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{
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cell initial = to_cell(ctx->pop());
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cell length = unbox_array_size();
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ctx->push(tag<string>(allot_string(length,initial)));
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}
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bool factor_vm::reallot_string_in_place_p(string *str, cell capacity)
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{
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return nursery.contains_p(str)
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&& (!to_boolean(str->aux) || nursery.contains_p(untag<byte_array>(str->aux)))
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&& capacity <= string_capacity(str);
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}
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/* Allocates memory */
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string* factor_vm::reallot_string(string *str_, cell capacity)
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{
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data_root<string> str(str_,this);
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if(reallot_string_in_place_p(str.untagged(),capacity))
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{
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str->length = tag_fixnum(capacity);
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if(to_boolean(str->aux))
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{
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byte_array *aux = untag<byte_array>(str->aux);
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aux->capacity = tag_fixnum(capacity * 2);
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}
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return str.untagged();
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}
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else
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{
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cell to_copy = string_capacity(str.untagged());
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if(capacity < to_copy)
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to_copy = capacity;
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data_root<string> new_str(allot_string_internal(capacity),this);
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memcpy(new_str->data(),str->data(),to_copy);
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if(to_boolean(str->aux))
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{
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byte_array *new_aux = allot_uninitialized_array<byte_array>(capacity * 2);
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new_str->aux = tag<byte_array>(new_aux);
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write_barrier(&new_str->aux);
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byte_array *aux = untag<byte_array>(str->aux);
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memcpy(new_aux->data<u16>(),aux->data<u16>(),to_copy * sizeof(u16));
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}
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fill_string(new_str.untagged(),to_copy,capacity,'\0');
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return new_str.untagged();
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}
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}
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/* Allocates memory */
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void factor_vm::primitive_resize_string()
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{
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data_root<string> str(ctx->pop(),this);
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str.untag_check(this);
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cell capacity = unbox_array_size();
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ctx->push(tag<string>(reallot_string(str.untagged(),capacity)));
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}
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void factor_vm::primitive_set_string_nth_fast()
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{
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string *str = untag<string>(ctx->pop());
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cell index = untag_fixnum(ctx->pop());
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cell value = untag_fixnum(ctx->pop());
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str->data()[index] = (u8)value;
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}
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}
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