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spl.h
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spl.h
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#include<string.h>
#include "data.h"
#define LEGAL 0
//Pre-defined constants in SPL
#define SCRATCHPAD 512
#define PAGE_TABLE 1024
#define MEM_LIST 1280
#define FILE_TABLE 1344
#define READY_LIST 1536
#define FAT 2560
#define DISK_LIST 3072
#define EX_HANDLER 3584
#define T_INTERRUPT 4608
#define INTERRUPT 5632
#define USER_PROG 12800
#define PAGE_PER_INTERRUPT 2
#define PAGE_SIZE 512
extern int linecount;
unsigned long temp_pos; //temporary lseek
int out_linecount=0; //no of lines of code generated
int addrBaseVal; //Starting Address where the compiled code will be loaded
int flag_break=0;
int regcount=0;
struct tree
{
char nodetype; /* +, -, *, /, %, =, <, >
?-if statement, I-ireturn, L-load
S-store, P-strcmp, Y-strcpy, w-while,
R-register //value=0-15, 20-SP, 21-BP, 22-IP 23-PTBR 24-PTLR
e-double equals, l-lessthan or equals
g-greaterthan or equals !-not equal
a-AND o-OR x-NOT
c-number, i-identifier,
n-nonterminal
b-break t-continue m-addresing expr
h-halt C-checkpoint I-ireturn
1-IN 2-OUT 3-INLINE
*/
char *name;
int value;
struct define *entry;
struct tree *ptr1, *ptr2, *ptr3;
};
FILE *fp;
//start labels
int labelcount=0;
struct jmp_point
{
unsigned long pos;
char instr[32];
struct jmp_point *next;
struct jmp_point *points;
};
struct label
{
int i;
unsigned long pos1,pos2;
char instr1[32],instr2[32];
struct label *next;
struct jmp_point *points;
};
struct label *root_label=NULL, *root_while=NULL;
void push_label()
{
struct label *temp;
temp=malloc(sizeof(struct label));
temp->i=labelcount;
temp->pos1=0;
temp->pos2=0;
bzero(temp->instr1,32);
bzero(temp->instr2,32);
temp->points=NULL;
temp->next=root_label;
root_label=temp;
labelcount++;
}
int pop_label()
{
int i;
struct label *temp;
temp=root_label;
root_label=root_label->next;
i=temp->i;
free(temp);
return i;
}
void push_while(int n)
{
struct label *temp;
temp=malloc(sizeof(struct label));
temp->i=n;
temp->pos1=0;
temp->pos2=0;
bzero(temp->instr1,32);
bzero(temp->instr2,32);
temp->points=NULL;
temp->next=root_while;
root_while=temp;
}
void pop_while()
{
struct label *temp;
temp=root_while;
root_while=root_while->next;
free(temp);
}
void add_jmp_point(char instr[32])
{
struct jmp_point *temp;
temp=malloc(sizeof(struct jmp_point));
fflush(fp);
temp->pos = ftell(fp);
strcpy(temp->instr,instr);
temp->next = root_while->points;
root_while->points = temp;
}
void use_jmp_points(struct jmp_point *root)
{
if(root == NULL)
return;
else
{
fflush(fp);
temp_pos = ftell(fp);
fseek(fp,root->pos,SEEK_SET);
fprintf(fp,"%s %05d",root->instr,addrBaseVal + out_linecount*2);
fseek(fp,temp_pos,SEEK_SET);
use_jmp_points(root->next);
free(root);
}
}
///end labels
///start constants and aliasing
struct define
{
char name[30];
int value;
struct define *next;
};
struct define *root_define=NULL;
char alias_table[8][30];
struct define* lookup_constant(char *name)
{
struct define *temp=root_define;
while(temp!=NULL)
{
if(strcmp(name, temp->name)==0)
return temp;
temp=temp->next;
}
return NULL;
}
int depth=0;
struct alias
{
char name[30];
int no, depth;
struct alias *next;
};
struct alias *root_alias=NULL;
struct alias * lookup_alias(char *name)
{
struct alias *temp=root_alias;
while(temp!=NULL)
{
if(strcmp(temp->name, name)==0)
return(temp);
temp=temp->next;
}
return(NULL);
}
struct alias * lookup_alias_reg(int no)
{
struct alias *temp=root_alias;
while(temp!=NULL)
{
if(no==temp->no)
return(temp);
temp=temp->next;
}
return(NULL);
}
void push_alias(char *name, int no)
{
struct alias *temp;
if(lookup_constant(name)!=NULL)
{
printf("\n%d: Alias name %s already used as symbolic contant!!\n", linecount, name);
exit(0);
}
temp=lookup_alias(name);
if(temp!=NULL && temp->depth == depth)
{
printf("\n%d: Alias name %s already used as in the current block!!\n", linecount, name);
exit(0);
}
else
{ temp=lookup_alias_reg(no);
if(temp!=NULL && temp->depth==depth)
strcpy(temp->name, name);
else
{
temp=malloc(sizeof(struct alias));
strcpy(temp->name, name);
temp->no=no;
temp->depth=depth;
temp->next=root_alias;
root_alias=temp;
}
}
}
void pop_alias()
{
struct alias *temp;
temp=root_alias;
while(temp!=NULL && temp->depth==depth)
{
root_alias=temp->next;
free(temp);
temp=root_alias;
}
}
void insert_constant(char *name, int value)
{
struct define * temp;
temp=lookup_constant(name);
if(temp==NULL)
{
temp=malloc(sizeof(struct define));
strcpy(temp->name,name);
temp->value=value;
temp->next=root_define;
root_define=temp;
}
else
{
printf("\n%d: Multiple Definition for Contant %s \n", linecount, name);
exit(0);
}
}
void add_predefined_constants()
{
struct define * temp;
char name[15];
bzero(name,15);
strcpy(name, "SCRATCHPAD");
if(lookup_constant(name)==NULL)
insert_constant(name, SCRATCHPAD);
bzero(name,15);
strcpy(name, "PAGE_TABLE");
if(lookup_constant(name)==NULL)
insert_constant(name, PAGE_TABLE);
bzero(name,15);
strcpy(name, "MEM_LIST");
if(lookup_constant(name)==NULL)
insert_constant(name, MEM_LIST);
bzero(name,15);
strcpy(name, "FILE_TABLE");
if(lookup_constant(name)==NULL)
insert_constant(name, FILE_TABLE);
bzero(name,15);
strcpy(name, "READY_LIST");
if(lookup_constant(name)==NULL)
insert_constant(name, READY_LIST);
bzero(name,15);
strcpy(name, "FAT");
if(lookup_constant(name)==NULL)
insert_constant(name, FAT);
bzero(name,15);
strcpy(name, "DISK_LIST");
if(lookup_constant(name)==NULL)
insert_constant(name, DISK_LIST);
bzero(name,15);
strcpy(name, "EX_HANDLER");
if(lookup_constant(name)==NULL)
insert_constant(name, EX_HANDLER);
bzero(name,15);
strcpy(name, "T_INTERRUPT");
if(lookup_constant(name)==NULL)
insert_constant(name, T_INTERRUPT);
bzero(name,15);
strcpy(name, "INTERRUPT");
if(lookup_constant(name)==NULL)
insert_constant(name, INTERRUPT);
bzero(name,15);
strcpy(name, "USER_PROG");
if(lookup_constant(name)==NULL)
insert_constant(name, USER_PROG);
}
struct tree * substitute_id(struct tree *id)
{
struct define *temp;
struct alias *temp2;
temp=lookup_constant(id->name);
if(temp!=NULL)
{
id->nodetype='c';
id->name=NULL;
id->value=temp->value;
return(id);
}
temp2=lookup_alias(id->name);
if(temp2==NULL)
{
printf("\n%d: Unknown identifier %s used!!\n", linecount, id->name);
exit(0);
}
id->nodetype='R';
id->name=NULL;
id->value=temp2->no;
return(id);
}
///end of constants and alias
///start tree create fns
struct tree * create_nonterm_node(char *name, struct tree *a, struct tree *b)
{
struct tree *temp=malloc(sizeof(struct tree));
temp->nodetype='n';
temp->name=name;
temp->entry=NULL;
temp->ptr1=a;
temp->ptr2=b;
temp->ptr3=NULL;
return temp;
}
struct tree * create_tree(struct tree *a, struct tree *b, struct tree *c, struct tree *d)
{
a->ptr1=b;
a->ptr2=c;
a->ptr3=d;
return a;
}
///end tree create fns
void getreg(struct tree *root, char reg[])
{
if(root->value >= R0 && root->value <= R7)
sprintf(reg, "R%d", root->value - R0);
else if(root->value >= S0 && root->value <= S15)
sprintf(reg, "S%d", root->value - S0);
else if(root->value == BP_REG)
sprintf(reg, "BP");
else if(root->value == SP_REG)
sprintf(reg, "SP");
else if(root->value == IP_REG)
sprintf(reg, "IP");
else if(root->value == PTBR_REG)
sprintf(reg, "PTBR");
else if(root->value == PTLR_REG)
sprintf(reg, "PTLR");
else if(root->value == EFR_REG)
sprintf(reg, "EFR");
}
void codegen(struct tree * root)
{
int n;
char reg1[5], reg2[5];
if(root==NULL)
return;
switch(root->nodetype)
{
case '<':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nLT T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "GT T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "LT T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "LT T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '>':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nGT T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "LT T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "GT T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "GT T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'e': //double equals
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nEQ T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "EQ T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "EQ T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "EQ T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'l': //lessthan or equals
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nLE T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "GE T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "LE T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "LE T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'g': //greaterthan or equals
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nGE T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "LE T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "GE T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "GE T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '!': //not equal
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nNE T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "NE T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "NE T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "NE T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'a': //AND operator
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nMUL T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MUL T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MUL T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MUL T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'o': //OR operator
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nADD T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "ADD T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "ADD T%d, %s\n", regcount-1, reg2);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "ADD T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case 'x': //NOT operator
out_linecount++;
fprintf(fp, "MOV T%d, 1\n", regcount);
regcount++;
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
out_linecount++;
fprintf(fp, "SUB T%d, %s\n", regcount-1, reg1);
}
else
{
codegen(root->ptr1);
out_linecount++;
fprintf(fp, "SUB T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
break;
case 'n': //statement list
codegen(root->ptr1);
codegen(root->ptr2);
break;
case '+':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nADD T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else if(root->ptr2->nodetype=='c')
{
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nADD T%d, %d\n", regcount, reg1, regcount, root->ptr2->value);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "ADD T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "ADD T%d, %s\n", regcount-1, reg2);
}
else if(root->ptr2->nodetype=='c')
{
out_linecount++;
fprintf(fp, "ADD T%d, %d\n", regcount-1, root->ptr2->value);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "ADD T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '-':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nSUB T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else if(root->ptr2->nodetype=='c')
{
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nSUB T%d, %d\n", regcount, reg1, regcount, root->ptr2->value);
regcount++;
}
else
{
out_linecount++;
fprintf(fp, "MOV T%d, %s\n", regcount, reg1);
regcount++;
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "SUB T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "SUB T%d, %s\n", regcount-1, reg2);
}
else if(root->ptr2->nodetype=='c')
{
out_linecount++;
fprintf(fp, "SUB T%d, %d\n", regcount-1, root->ptr2->value);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "SUB T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '*':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nMUL T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else if(root->ptr2->nodetype=='c')
{
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nMUL T%d, %d\n", regcount, reg1, regcount, root->ptr2->value);
regcount++;
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MUL T%d, %s\n", regcount-1, reg1);
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MUL T%d, %s\n", regcount-1, reg2);
}
else if(root->ptr2->nodetype=='c')
{
out_linecount++;
fprintf(fp, "MUL T%d, %d\n", regcount-1, root->ptr2->value);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MUL T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '/':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nDIV T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else if(root->ptr2->nodetype=='c')
{
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nDIV T%d, %d\n", regcount, reg1, regcount, root->ptr2->value);
regcount++;
}
else
{
out_linecount++;
fprintf(fp, "MOV T%d, %s\n", regcount, reg1);
regcount++;
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "DIV T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "DIV T%d, %s\n", regcount-1, reg2);
}
else if(root->ptr2->nodetype=='c')
{
out_linecount++;
fprintf(fp, "DIV T%d, %d\n", regcount-1, root->ptr2->value);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "DIV T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '%':
if(root->ptr1->nodetype=='R')
{
getreg(root->ptr1, reg1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nMOD T%d, %s\n", regcount, reg1, regcount, reg2);
regcount++;
}
else if(root->ptr2->nodetype=='c')
{
out_linecount+=2;
fprintf(fp, "MOV T%d, %s\nMOD T%d, %d\n", regcount, reg1, regcount, root->ptr2->value);
regcount++;
}
else
{
out_linecount++;
fprintf(fp, "MOV T%d, %s\n", regcount, reg1);
regcount++;
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MOD T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
else
{
codegen(root->ptr1);
if(root->ptr2->nodetype=='R')
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MOD T%d, %s\n", regcount-1, reg2);
}
else if(root->ptr2->nodetype=='c')
{
out_linecount++;
fprintf(fp, "MOD T%d, %d\n", regcount-1, root->ptr2->value);
}
else
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MOD T%d, T%d\n", regcount-2, regcount-1);
regcount--;
}
}
break;
case '=': //assignment
if(root->ptr1->nodetype=='m') //[expr/no]=*
{
if(root->ptr1->ptr1->nodetype=='c') //[no]=*
{
if(root->ptr2->nodetype=='R') //[no]=reg
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MOV [%d], %s\n", root->ptr1->ptr1->value, reg2);
}
else if(root->ptr2->nodetype=='c') //[no]=no
{
out_linecount++;
fprintf(fp, "MOV [%d], %d\n", root->ptr1->ptr1->value, root->ptr2->value);
}
else if(root->ptr2->nodetype=='s') //[no]=string
{
out_linecount++;
fprintf(fp, "MOV [%d], %s\n", root->ptr1->ptr1->value, root->ptr2->name);
}
else //[no]=expr
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MOV [%d], T%d\n", root->ptr1->ptr1->value, regcount-1);
regcount--;
}
}
else if(root->ptr1->ptr1->nodetype=='R') //[reg]=*
{
getreg(root->ptr1->ptr1, reg1);
if(root->ptr2->nodetype=='R') //[reg]=reg
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MOV [%s], %s\n", reg1, reg2);
}
else if(root->ptr2->nodetype=='c') //[reg]=no
{
out_linecount++;
fprintf(fp, "MOV [%s], %d\n", reg1, root->ptr2->value);
}
else if(root->ptr2->nodetype=='s') //[reg]=string
{
out_linecount++;
fprintf(fp, "MOV [%s], %s\n", reg1, root->ptr2->name);
}
else //[reg]=expr
{
codegen(root->ptr2);
out_linecount++;
fprintf(fp, "MOV [%s], T%d\n", reg1, regcount-1);
regcount--;
}
}
else //[expr]=*
{
codegen(root->ptr1->ptr1);
if(root->ptr2->nodetype=='R') //[expr]=reg
{
getreg(root->ptr2, reg2);
out_linecount++;
fprintf(fp, "MOV [T%d], %s\n", regcount-1, reg2);