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fix label #47

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Merged
shenao78 merged 1 commit into from
Sep 3, 2021
Merged

fix label #47

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47 changes: 38 additions & 9 deletions compiler/codegen.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,12 +69,19 @@ fix_labels(OpcodeBuf *ob)
int address;

for (i = 0; i < ob->size; i++) {
// ignore stack data
if (ob->code[i] >= OP_DATA_1 && ob->code[i] <= OP_DATA_75) {
int len = ob->code[i] - OP_DATA_1 + 1;
i += len;
continue;
}

// fix jump table label
if (ob->code[i] == OP_JUMP
|| ob->code[i] == OP_JUMPIF) {
label = (ob->code[i+1] << 8) + (ob->code[i+2]);
label = ob->code[i+1];
address = ob->label_table[label].label_address;
ob->code[i+1] = (SVM_Byte)(address >> 8);
ob->code[i+2] = (SVM_Byte)(address &0xff);
ob->code[i+1] = (SVM_Byte)address;
}
}
}
Expand Down Expand Up @@ -108,7 +115,7 @@ fix_opcode_buf(OpcodeBuf *ob)
{
SVM_Byte *ret;

// fix_labels(ob);
fix_labels(ob);
ret = realloc(ob->code, ob->size);
free(ob->label_table);

Expand Down Expand Up @@ -300,6 +307,17 @@ generate_block_statement(SVM_Executable *exe, Block *current_block,
generate_statement_list(exe, current_block, block_stmt->statement_list, ob);
}

/*
1) if_s->condition expr
2) IF_FALSE op, label_address op
2) label OP_JUMP
3) if_s->then_block->statement_list expr
4) OP_JUMP op, label_address op
5) set fasle label
6) forloop if_s->elsif_list repeat 1) - 5)
7) else_block->statement_list expr
8) set end label
*/
static void
generate_if_statement(SVM_Executable *exe, Block *block,
IfStatement *if_s, OpcodeBuf *ob)
Expand All @@ -309,22 +327,33 @@ generate_if_statement(SVM_Executable *exe, Block *block,
Elseif *elseif;

generate_expression(exe, block, if_s->condition, ob);

if_false_label = get_label(ob);
generate_code(ob, OP_JUMPIF, if_false_label);
// TODO: set JumpTarget
generate_code(ob, OP_NOT);
generate_code(ob, OP_JUMPIF);
generate_code(ob, if_false_label);

generate_statement_list(exe, if_s->then_block,
if_s->then_block->statement_list, ob);

end_label = get_label(ob);
generate_code(ob, OP_JUMP, end_label);
generate_code(ob, OP_JUMP);
generate_code(ob, end_label);
set_label(ob, if_false_label);

for (elseif = if_s->elseif_list; elseif; elseif = elseif->next) {
generate_expression(exe, block, elseif->condition, ob);

if_false_label = get_label(ob);
generate_code(ob, OP_JUMPIF, if_false_label);
generate_code(ob, OP_NOT);
generate_code(ob, OP_JUMPIF);
generate_code(ob, if_false_label);

generate_statement_list(exe, elseif->block,
elseif->block->statement_list, ob);
generate_code(ob, OP_JUMP, end_label);

generate_code(ob, end_label);
generate_code(ob, OP_JUMP);
set_label(ob, if_false_label);
}
if (if_s->else_block) {
Expand Down