65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
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#include "instruction.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "classfile.h"
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Instruction* Instruction_parse(uint32_t bytes_length, uint8_t* bytes) {
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Instruction* start = (Instruction*)malloc(sizeof(Instruction));
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Instruction* current = start;
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u4 i = 0, n = 0;
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while (i < bytes_length) {
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current->opcode = bytes[i++];
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switch (current->opcode) {
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case ALOAD_0:
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case RETURN:
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current->operands = NULL;
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break;
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case LDC:
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*(u1*)¤t->operands = bytes[i++];
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break;
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case GETSTATIC:
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case INVOKESPECIAL:
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case INVOKEVIRTUAL:
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// current->operands = malloc(sizeof(u2));
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*(u2*)¤t->operands = (*(u2*)&bytes[i] << 8) | bytes[i + 1];
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i += 2;
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break;
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}
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if (i < bytes_length) {
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current->next = (Instruction*)malloc(sizeof(Instruction));
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current = current->next;
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} else {
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current->next = NULL;
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}
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}
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return start;
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}
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void Instruction_print_code(Instruction* code) {
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u4 i = 0;
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while (code) {
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printf("\t\t%hx ", (u1)code[i].opcode);
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switch (code[i].opcode) {
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case ALOAD_0:
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case RETURN:
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putchar('\n');
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break;
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case LDC:
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printf("#%hhu\n", *(u1*)&code[i].operands);
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break;
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case GETSTATIC:
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case INVOKESPECIAL:
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case INVOKEVIRTUAL:
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printf("#%hu\n", *(u2*)&code[i].operands);
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break;
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}
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code = code->next;
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}
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}
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