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command.c
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command.c
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#include <stdio.h>
#include <string.h>
#include <math.h>
#include "command.h"
#include "hash.h"
void output(const char *str)
{
printf("%s\n", str);
}
static int func_is_main(int funcname)
{
if (funcname == ELFHash("main", 4))
return 1;
return 0;
}
static void getvarstr(char *varstr, int offset)
{
if (offset >= 0)
sprintf(varstr, "[%s+%d]", EBP, offset);
else
sprintf(varstr, "[%s%d]", EBP, offset);
}
static int getregstr(char *regstr, int reg)
{
switch (reg) {
case 1:
strcpy(regstr, EAX);
return 0;
case 2:
strcpy(regstr, EBX);
return 0;
case 3:
strcpy(regstr, ECX);
return 0;
case 4:
strcpy(regstr, EDX);
return 0;
}
return -1;
}
int creat_label()
{
static int labelno = 0;
return ++labelno;
}
void code_label(int labelno)
{
sprintf(strbucket, "%s%d:", LABEL, labelno);
output(strbucket);
}
void code_jmp(int labelno)
{
sprintf(strbucket, "%s\t%s%d", JMP, LABEL, labelno);
output(strbucket);
}
void code_pop(int reg)
{
char regstr[REGSTR_LENGTH];
getregstr(regstr, reg);
sprintf(strbucket, "%s\t%s", POP, regstr);
output(strbucket);
}
void code_lea_global(int target, int addr, int offset)
{
int array;
char offreg[REGSTR_LENGTH];
char tarreg[REGSTR_LENGTH];
array = getregstr(offreg, offset);
getregstr(tarreg, target);
if (array == -1) { /* not array */
sprintf(strbucket, "%s\t%s, [%s%d]", LEA, tarreg, GDATA_PRE,
addr);
} else { /* array with offset */
sprintf(strbucket, "%s\t%s, [%s%d+%s]", LEA, tarreg, GDATA_PRE,
addr, offreg);
}
output(strbucket);
}
void code_lea_local(int target, int var)
{
char t_reg[REGSTR_LENGTH];
char s_var[VARSTR_LENGTH];
getregstr(t_reg, target);
getvarstr(s_var, var);
sprintf(strbucket, "%s\t%s, %s", LEA, t_reg, s_var);
output(strbucket);
}
void code_move_reg(int target, int source)
{
char t_reg[REGSTR_LENGTH];
char s_reg[REGSTR_LENGTH];
if (target == source)
return;
getregstr(t_reg, target);
getregstr(s_reg, source);
sprintf(strbucket, "%s\t%s, %s", MOV, t_reg, s_reg);
output(strbucket);
}
void code_push_mem(int addr, int offset)
{
char regstr[REGSTR_LENGTH];
getregstr(regstr, offset);
sprintf(strbucket, "%s\t%s [%s%d+%s]", PUSH, VARSIZE,
GDATA_PRE, addr, regstr);
output(strbucket);
}
void code_push_reg(int reg, int mem)
{
char regstr[REGSTR_LENGTH];
getregstr(regstr, reg);
if (mem) {
sprintf(strbucket, "%s\t%s [%s]", PUSH, VARSIZE, regstr);
} else {
sprintf(strbucket, "%s\t%s %s", PUSH, VARSIZE, regstr);
}
output(strbucket);
}
void code_push_ind(int idx)
{
char varstr[VARSTR_LENGTH];
getvarstr(varstr, idx);
sprintf(strbucket, "%s\t%s %s", PUSH, VARSIZE, varstr);
output(strbucket);
}
void code_push_cons(int constant)
{
sprintf(strbucket, "%s\t%s %d", PUSH, VARSIZE, constant);
output(strbucket);
}
void code_push_global_var(int var, int offset)
{
if (offset >= 0) {
sprintf(strbucket, "%s\t%s [%s%d+%d]", PUSH, VARSIZE, GDATA_PRE,
var, offset);
} else {
sprintf(strbucket, "%s\t%s [%s%d%d]", PUSH, VARSIZE, GDATA_PRE,
var, offset);
}
output(strbucket);
}
void code_push_global_array(int var)
{
sprintf(strbucket, "%s\t%s %s%d", PUSH, VARSIZE, GDATA_PRE, var);
output(strbucket);
}
void code_call_func(int funcname)
{
sprintf(strbucket, "%s\t%s%d", CALLF, FUNC_PRE, funcname);
output(strbucket);
}
void code_start_bss()
{
static int bss_mark = 0;
if (!bss_mark) {
strcpy(strbucket, "section .bss");
output(strbucket);
++bss_mark;
}
}
void code_start_text()
{
static int text_mark = 0;
if (!text_mark) {
strcpy(strbucket, "section .text");
output(strbucket);
++text_mark;
}
}
void code_declare_global_var(int varname, int size)
{
sprintf(strbucket, "%s%d:\t%s %d", GDATA_PRE, varname,
GLOBAL_VAR_DEFINE, GLOBAL_VAR_LENGTH * size);
output(strbucket);
}
void code_start_func(int funcname)
{
if (func_is_main(funcname)) {
strcpy(strbucket, "global _start\n_start:");
} else {
sprintf(strbucket, "global %s%d\n%s%d:", FUNC_PRE, funcname,
FUNC_PRE, funcname);
}
output(strbucket);
sprintf(strbucket, "%s\t%s", PUSH, EBP);
output(strbucket);
sprintf(strbucket, "%s\t%s, %s", MOV, EBP, ESP);
output(strbucket);
}
void code_clean_stack(int height)
{
sprintf(strbucket, "%s\t%s, %d", ADD, ESP, height);
output(strbucket);
}
void code_end_func(int funcname)
{
sprintf(strbucket, "%s", LEAVE);
output(LEAVE);
if (!func_is_main(funcname)) {
output(RET);
} else {
code_end_main();
}
}
void code_sub_esp(int size)
{
sprintf(strbucket, "%s\t%s, %d", SUB, ESP, size);
output(strbucket);
}
void code_test_condition(int reg, int test, int labelno)
{
char regstr[REGSTR_LENGTH];
getregstr(regstr, reg);
sprintf(strbucket, "%s\t%s, %d", CMP, regstr, test);
output(strbucket);
sprintf(strbucket, "%s\t%s%d", JE, LABEL, labelno);
output(strbucket);
}
void code_op_assign(int target, int source)
{
char t_reg[VARSTR_LENGTH];
char s_reg[REGSTR_LENGTH];
getregstr(s_reg, source);
getregstr(t_reg, target);
sprintf(strbucket, "%s\t%s [%s], %s", MOV, VARSIZE, t_reg, s_reg);
output(strbucket);
}
int code_get_array_offset(int baseoff, int idxreg, int varlength, int global)
{
char regstr[REGSTR_LENGTH];
getregstr(regstr, idxreg);
if (global == 0) { /* general local var */
sprintf(strbucket, "%s\t%s, %s", MOV, EBX, EBP);
output(strbucket);
} else if (global == -1) { /* parameter */
/* the array position in memory */
sprintf(strbucket, "%s\t%s, [%s+%d]", MOV, EBX, EBP, baseoff);
output(strbucket);
} else { /* global var, just calculate the array index offset */
sprintf(strbucket, "%s\t%s, 0", MOV, EBX);
output(strbucket);
}
/* get the array index offset */
sprintf(strbucket, "%s\t%s, %d", IMUL, regstr, varlength);
output(strbucket);
sprintf(strbucket, "%s\t%s, %s", ADD, EBX, EAX);
output(strbucket);
if (global == 0) {
sprintf(strbucket, "%s\t%s, %d", SUB, EBX, abs(baseoff));
output(strbucket);
}
return 2; /* store in ebx */
}
/* put the result in eax */
int code_op_binary(int v1, int v2, char *op)
{
char regstr1[REGSTR_LENGTH];
char regstr2[REGSTR_LENGTH];
getregstr(regstr1, v1);
getregstr(regstr2, v2);
int sar = 31;
if (strcmp(op, "+") == 0) {
sprintf(strbucket, "%s\t%s, [%s+%s]", LEA, EAX, regstr1,
regstr2);
} else if (strcmp(op, "-") == 0) {
sprintf(strbucket, "%s\t%s, %s", SUB, regstr1, regstr2);
} else if (strcmp(op, "*") == 0) {
sprintf(strbucket, "%s\t%s, %s", IMUL, regstr1, regstr2);
} else if (strcmp(op, "/") == 0) {
sprintf(strbucket, "%s\t%s, %s", MOV, EDX, regstr1);
output(strbucket);
sprintf(strbucket, "%s\t%s, %d", SAR, EDX, sar);
output(strbucket);
sprintf(strbucket, "%s\t%s", IDIV, regstr2);
} else { /* relop */
sprintf(strbucket, "%s\t%s, %s", CMP, regstr1, regstr2);
output(strbucket);
if (strcmp(op, "==") == 0) {
sprintf(strbucket, "%s\t%s", SETE, AL);
} else if (strcmp(op, "!=") == 0) {
sprintf(strbucket, "%s\t%s", SETNE, AL);
} else if (strcmp(op, ">") == 0) {
sprintf(strbucket, "%s\t%s", SETG, AL);
} else if (strcmp(op, "<") == 0) {
sprintf(strbucket, "%s\t%s", SETL, AL);
} else if (strcmp(op, ">=") == 0) {
sprintf(strbucket, "%s\t%s", SETGE, AL);
} else if (strcmp(op, "<=") == 0) {
sprintf(strbucket, "%s\t%s", SETLE, AL);
}
output(strbucket);
sprintf(strbucket, "%s\t%s, %s", MOVZX, EAX, AL);
}
output(strbucket);
return 1; /* return which reg it stores the result */
}
int code_data_section()
{
static int data_mark = 0;
if (!data_mark) {
strcpy(strbucket, "section .data");
output(strbucket);
strcpy(strbucket, "numbers db \"0123456789\", 0xA");
output(strbucket);
strcpy(strbucket, "inputchar db 0");
output(strbucket);
++data_mark;
return 0;
}
return data_mark;
}
/* output function */
void code_func_output()
{
/*code_start_func(); */
strcpy(strbucket,
"sub esp, 4\nmov dword [ebp-4], 0\njmp G2\nG1:\nadd dword [ebp-4], 1\npush edx");
output(strbucket);
strcpy(strbucket,
"G2:\nmov edx, 0\nmov eax, [ebp+8]\nmov ebx, 10\ndiv ebx\nmov [ebp+8], eax");
output(strbucket);
strcpy(strbucket,
"cmp eax, 0\njnz G1\npush edx\nadd dword [ebp-4], 1\njmp G3");
output(strbucket);
strcpy(strbucket,
"G4:\nsub dword [ebp-4], 1\npop edx\nmov eax, 4\nmov ebx, 1\nmov ecx, numbers");
output(strbucket);
strcpy(strbucket, "add ecx, edx\nmov edx, 1\nint 80h");
output(strbucket);
strcpy(strbucket,
"G3:\ncmp dword [ebp-4], 0\njnz G4\nmov eax, 4\nmov ebx, 1\nlea ecx, [numbers+10]");
output(strbucket);
strcpy(strbucket, "mov edx, 1\nint 80h");
output(strbucket);
}
/* input function */
void code_func_input()
{
strcpy(strbucket,
"sub esp, 4\nmov dword [ebp-4], 0\nmov byte [inputchar], 0\njmp G6");
output(strbucket);
strcpy(strbucket,
"G5:\nmov dword eax, [ebp-4]\nmov ebx, 10\nmul ebx\nxor ecx, ecx");
output(strbucket);
strcpy(strbucket,
"mov byte cl, [inputchar]\nsub ecx, 48\nadd eax, ecx\nmov dword [ebp-4], eax");
output(strbucket);
strcpy(strbucket,
"G6:\nmov eax, 03h\nmov ebx, 00h\nmov ecx, inputchar\nmov edx, 01h");
output(strbucket);
strcpy(strbucket,
"int 80h\ncmp byte [inputchar], 0ah\njne G5\nmov dword eax, [ebp-4]");
output(strbucket);
}
static void code_end_main()
{
sprintf(strbucket, "mov ebx, eax\nmov eax,1\nint 80h");
output(strbucket);
}