aus_sammelwut/paulchen/ublu/ss08/abgabe/codeb/code_gen.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "code_gen.h"
   4
   5 int variables;
   6
   7 void function_header(char *name, int vars) {
   8         variables = vars;
   9         printf("\t.globl %s\n\t.type %s, @function\n%s:\n", name, name, name);
  10         if(vars>0) {
  11                 printf("\tpushq %%rbp\n\tmovq %%rsp, %%rbp\n\tsubq $%i, %%rsp\n", 8*vars);
  12         }
  13 }
  14
  15 char *get_next_reg(char *name, int skip_reg) {
  16         char *reg_names[]={"rax", "r10", "r11", "r9", "r8", "rcx", "rdx", "rsi", "rdi"};
  17         int index, a;
  18         if(name==(char *)NULL) {
  19                 index=0;
  20         }
  21         else {
  22                 for(a=0;a<9;a++) {
  23                         if(!strcmp(name,reg_names[a])) {
  24                                 index=a+1;
  25                                 break;
  26                         }
  27                 }
  28         }
  29         if(skip_reg) {
  30                 index++;
  31         }
  32         return reg_names[index];
  33 }
  34
  35 char *get_param_reg(long number) {
  36         char *reg_names[]={"rdi", "rsi", "rdx", "rcx", "r8", "r9"};
  37         return reg_names[number-1];
  38 }
  39
  40 void ret(void) {
  41         if(variables>0) {
  42                 printf("\tleave\n");
  43         }
  44         printf("\tret\n");
  45 }
  46
  47 void move(char *src, char *dst) {
  48         if(strcmp(src,dst)) {
  49                 printf("\tmovq %%%s, %%%s\n",src,dst);
  50         }
  51 }
  52