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fix labels #23

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Merged
shenao78 merged 1 commit into from
Aug 10, 2021
Merged

fix labels #23

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56 changes: 50 additions & 6 deletions compiler/codegen.c
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Original file line number Diff line number Diff line change
Expand Up @@ -133,12 +133,48 @@ generate_statement_list(SVM_Executable *exe, Block *current_block,
static void generate_expression(SVM_Executable *exe, Block *current_block,
Expression *expr, OpcodeBuf *ob);

static void
fix_labels(OpcodeBuf *ob)
{
int i;
int j;
OpcodeInfo *info;
int label;
int address;

for (i = 0; i < ob->size; i++) {
if (ob->code[i] == JUMP
|| ob->code[i] == JUMPIF) {
label = (ob->code[i+1] << 8) + (ob->code[i+2]);
address = ob->label_table[label].label_address;
ob->code[i+1] = (SVM_Byte)(address >> 8);
ob->code[i+2] = (SVM_Byte)(address &0xff);
}
info = &svm_opcode_info[ob->code[i]];
for (j = 0; info->parameter[j] != '\0'; j++) {
switch (info->parameter[j]) {
case 'b':
i++;
break;
case 's':
case 'p':
i += 2;
break;
default:
printf("param..%s, j..%d", info->parameter, j);
exit(1);
}
}
}
}

static void
add_function(SVM_Executable *exe, FuncDefinition *src)
{
OpcodeBuf ob;
init_opcode_buf(&ob);
generate_statement_list(exe, src->block, src->block->statement_list, &ob);
fix_labels(&ob);
}

static void
Expand Down Expand Up @@ -286,12 +322,25 @@ generate_binary_expression(SVM_Executable *exe, Block *block,
static int
get_label(OpcodeBuf *ob)
{
return 0;
int ret;

if (ob->label_table_alloc_size < ob->label_table_size + 1) {
ob->label_table = realloc(ob->label_table,
(ob->label_table_alloc_size
+ LABEL_TABLE_ALLOC_SIZE)
* sizeof(LabelTable));
ob->label_table_alloc_size += LABEL_TABLE_ALLOC_SIZE;
}
ret = ob->label_table_size;
ob->label_table_size++;

return ret;
}

static void
set_label(OpcodeBuf *ob, int label)
{
ob->label_table[label].label_address = ob->size;
}

static void
Expand Down Expand Up @@ -445,11 +494,6 @@ generate_statement_list(SVM_Executable *exe, Block *current_block,
}
}

static void
fix_labels(OpcodeBuf *ob)
{
}

static SVM_Byte *
fix_opcode_buf(OpcodeBuf *ob)
{
Expand Down