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comparison runtime/context.c @ 8:8d74ef7fa357

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Improved helper macros and added separate Rhope stack in runtime
author Mike Pavone <pavone@retrodev.com>
date Wed, 13 May 2009 23:37:19 -0400
parents
children 31f8182f3433
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7:d61550e2c001 8:8d74ef7fa357
1 #include "context.h"
2 #include "object.h"
3 #include <stdlib.h>
4 #include <stddef.h>
5 #include <stdio.h>
6
7 stackchunk * new_stack()
8 {
9 stackchunk * st = malloc(sizeof(stackchunk));
10 st->prev = NULL;
11 st->next = NULL;
12 st->used = 0;
13 return st;
14 }
15
16 context * new_context()
17 {
18 context * c = malloc(sizeof(context));
19 c->stack_begin = new_stack();
20 c->current_stack = c->stack_begin;
21 c->unwind = NULL;
22 return c;
23 }
24
25 void * alloc_stack(context * ct, uint32_t size)
26 {
27 void * ret;
28 stackchunk * current = ct->current_stack;
29 if(size > STACK_CHUNK_SIZE)
30 return NULL;
31 while(current && STACK_CHUNK_SIZE - current->used < size)
32 {
33 if(!current->next)
34 current->next = new_stack();
35 current = current->next;
36 }
37 if(!current)
38 return NULL;
39 ct->current_stack = current;
40 ret = current->data + current->used;
41 current->used += size;
42 return ret;
43 }
44
45 calldata * alloc_cdata(context * ct, uint32_t num_params)
46 {
47 calldata * out = alloc_stack(ct, sizeof(calldata)+(num_params-1)*sizeof(object *));
48 if(out)
49 out->ct = ct;
50 return out;
51 }
52
53 void free_stack(context * ct, void * data)
54 {
55 char * cdata = data;
56 if(cdata < ct->current_stack->data || cdata >= ct->current_stack->data+STACK_CHUNK_SIZE) {
57 fputs("Tried to free stack data from outside of current stack chunk!", stderr);
58 exit(-1);
59 }
60 ct->current_stack->used = cdata-ct->current_stack->data;
61 if(!ct->current_stack->used && ct->current_stack->prev)
62 ct->current_stack = ct->current_stack->prev;
63 }
64