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code_writer.c
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code_writer.c
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#include "code_writer.h"
#include "string.h"
#include "stdio.h"
#include "file.h"
static FILE* file;
static int label_i = 0;
int init_writer(const char* filepath) {
if(file != NULL) {
fclose(file);
}
file = fopen(filepath, "w");
if(file == NULL) {
puts("Bad file.");
return 1;
}
return 0;
}
int write_pop(command* command) {
return 0;
}
int write_push(command* command) {
printf("Writing Push: %s", command->arg2);
char* code = malloc(1024);
strcat(code, "@");
strcat(code, command->arg2);
strcat(code, "\nD=A\n@SP\nA=M\nM=D\n@SP\nM=M-1\n");
fwrite(code, strlen(code), 1, file);
free(code);
return 0;
}
int write_command(command* command) {
if (command->type == NULL) {
return 1;
}
printf("Got cmd: %s arg1: %s arg2: %s\n", command->type, command->arg1, command->arg2);
if (strcmp(command->type, "C_ARITHMETIC") == 0) {
write_arithmetic(command);
}
if (strcmp(command->type, "C_POP") == 0) {
write_pop(command);
}
if (strcmp(command->type, "C_PUSH") == 0) {
write_push(command);
}
return 0;
}
int write_arithmetic(command* command) {
char* pop_code = "@SP\nM=M+1\nA=M\nD=M\n@ARG\nA=M\nM=D\n";
char* code = malloc(1024);
strcat(code, pop_code);
strcat(code, "@ARG\nA=M\nD=M\n@SP\nA=M\n");
if(strcmp(command->arg1, "add") == 0 ) {
strcat(code, "D=D+M\n");
}
if(strcmp(command->arg1, "sub") == 0 ) {
strcat(code, "D=D-M\n");
}
if(strcmp(command->arg1, "and") == 0 ) {
strcat(code, "D=D&M\n");
}
if(strcmp(command->arg1, "or") == 0 ) {
strcat(code, "D=D|M\n");
}
if(strcmp(command->arg1, "add") == 0 ) {
sprintf(code, "@CMP_EQ%d\nD;JEQ\nD=0\n@CMP_EQ%d_END\n0;JMP",
label_i, label_i);
}
// Push D to curr stack
strcat(code, "@SP\nA=M\nM=D\n@SP\nM=M-1\n");
fwrite(code, strlen(code), 1, file);
return 0;
}