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annotate runtime/context.c @ 52:079200bc3e75

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String literals almost working. Print moved out of C runtime.
author Mike Pavone <pavone@retrodev.com>
date Wed, 28 Apr 2010 01:23:30 -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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15
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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 c->unwind = NULL;
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22 return c;
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23 }
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24
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25 void free_context(context * c)
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26 {
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27 stackchunk *next,*current = c->stack_begin;
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28 while(current)
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29 {
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30 next = current->next;
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31 free(current);
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32 current = next;
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33 }
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34 free(c);
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35 }
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36
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37 void * alloc_stack(context * ct, uint32_t size)
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38 {
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39 void * ret;
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40 stackchunk * current = ct->current_stack;
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41 if(size > STACK_CHUNK_SIZE)
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42 {
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43 fprintf(stderr, "%d is bigger than stack chunk size of %d\n", size, STACK_CHUNK_SIZE);
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44 return NULL;
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45 }
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46 while(current && STACK_CHUNK_SIZE - current->used < size)
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47 {
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48 if(!current->next)
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49 {
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50 current->next = new_stack();
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51 current->next->prev = current;
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52 }
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53 current = current->next;
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54 }
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55 if(!current)
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56 {
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57 fprintf(stderr, "Failed to allocate stack chunk");
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58 return NULL;
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59 }
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60 ct->current_stack = current;
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61 ret = current->data + current->used;
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62 current->used += size;
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63 return ret;
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64 }
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65
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66 calldata * alloc_cdata(context * ct, uint32_t num_params)
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67 {
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68 calldata * out = alloc_stack(ct, sizeof(calldata)+(num_params-1)*sizeof(object *));
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69 if(out)
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70 out->ct = ct;
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71 return out;
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72 }
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73
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74 void free_stack(context * ct, void * data)
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75 {
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76 char * cdata = data;
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77 while(cdata < ct->current_stack->data || cdata >= ct->current_stack->data+STACK_CHUNK_SIZE) {
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78 if(ct->current_stack == ct->stack_begin)
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79 {
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80 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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81 exit(-1);
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82 }
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83 ct->current_stack->used = 0;
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84 ct->current_stack = ct->current_stack->prev;
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85 }
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86 ct->current_stack->used = cdata-ct->current_stack->data;
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87 if(!ct->current_stack->used && ct->current_stack->prev)
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88 ct->current_stack = ct->current_stack->prev;
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89 }
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90