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annotate runtime/context.c @ 56:d2f9b0a9403d

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Initial experiment with goto and switch
author Mike Pavone <pavone@retrodev.com>
date Thu, 08 Oct 2009 01:52:38 -0400
parents 640f541e9116
children 04baa003de5a
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1 #include "context.h"
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2 #include "object.h"
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3 #include <stdlib.h>
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4 #include <stddef.h>
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5 #include <stdio.h>
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6
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7 stackchunk * new_stack()
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8 {
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9 stackchunk * st = malloc(sizeof(stackchunk));
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10 st->prev = NULL;
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11 st->next = NULL;
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12 st->used = 0;
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13 return st;
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14 }
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16 context * new_context()
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17 {
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18 context * c = malloc(sizeof(context));
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19 c->stack_begin = new_stack();
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20 c->current_stack = c->stack_begin;
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21 return c;
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22 }
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23
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24 void * alloc_stack(context * ct, uint32_t size)
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25 {
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26 void * ret;
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27 stackchunk * current = ct->current_stack;
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28 if(size > STACK_CHUNK_SIZE)
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29 {
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30 fprintf(stderr, "%d is bigger than stack chunk size of %d\n", size, STACK_CHUNK_SIZE);
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31 return NULL;
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32 }
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33 while(current && STACK_CHUNK_SIZE - current->used < size)
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34 {
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35 if(!current->next)
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36 {
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37 current->next = new_stack();
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38 current->next->prev = current;
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39 }
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40 current = current->next;
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41 }
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42 if(!current)
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43 {
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44 fprintf(stderr, "Failed to allocate stack chunk");
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45 return NULL;
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46 }
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47 ct->current_stack = current;
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48 ret = current->data + current->used;
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49 current->used += size;
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50 return ret;
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51 }
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52
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53 calldata * alloc_cdata(context * ct, calldata * lastframe, uint32_t num_params)
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54 {
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55 calldata * retval = (calldata *)(((char *)alloc_stack(ct, sizeof(calldata)+(num_params-1)*sizeof(object *))) + sizeof(object *)*(num_params-1));
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56 retval->lastframe = lastframe;
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57 return retval;
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58 }
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59
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60 void free_stack(context * ct, void * data)
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61 {
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62 char * cdata = data;
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63 while(cdata < ct->current_stack->data || cdata >= ct->current_stack->data+STACK_CHUNK_SIZE) {
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64 if(ct->current_stack == ct->stack_begin)
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65 {
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66 fprintf(stderr, "Attempt to free memory at %X using free_stack, but %X doesn't appear to be stack allocated\n", data, data);
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67 exit(-1);
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68 }
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69 ct->current_stack->used = 0;
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70 ct->current_stack = ct->current_stack->prev;
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71 }
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72 ct->current_stack->used = cdata-ct->current_stack->data;
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73 if(!ct->current_stack->used && ct->current_stack->prev)
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74 ct->current_stack = ct->current_stack->prev;
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75 }
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76