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codegen.c
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FILE *intermediate;
int res, counter = -1, label = 3, temporary = 0, offset = 0, offset1 = 0, Loffset = 0, isamp = 0, i, j, fld = 0, w1, w2, st = 1, arg_count = 0;
//w1 & w2 stores the start and end of while loop (label numbers) which are used by break and continue to transfer control.
//arg_count is to count the number of arguments in exposcall function.
int class_addr; //pointer to the class in the data structure created for classes i.e 4096 + (8*ClassIndex)
struct Lsymbol *Ltemp;
int tree_iter = 0, flditer = 0, we1 = 0, we2 = 0; //we1 and we2 are boolean variables for read and write in exposcall
struct Gsymbol *Gtemp;
struct Paramstruct *Argtemp, *Arg_callee;
struct Fieldlist *fldtemp1, *fldtemp2;
int getlabel()
{
return ++label;
}
void freereg()
{
if (counter >= 0)
counter--;
}
void freeallreg()
{
counter = -1;
}
int getreg()
{
if (counter < 16)
return ++counter;
else
{
printf("Running out of registers\n");
exit(1);
}
}
int codegen(struct ASTNode *root)
{
int number, a, r1, r2, r3, l1, l2, i, status = 0, fld_backup;
struct ASTNode *temp, *temp1;
struct ASTNode *Ttemp;
if (intermediate == NULL)
{
printf("Error while generating assemblycode\n");
exit(1);
}
if (root == NULL)
return 0;
if (root->nodetype == NODE_EXPR)
{
tree_iter = 0;
Arg_callee = root->ptr3;
Argtemp = Arg_callee;
while (Argtemp != NULL)
{
++tree_iter;
Argtemp = Argtemp->next;
}
Ttemp = root;
while (tree_iter != 1)
{
if (Ttemp->ptr1->nodetype == NODE_ID)
{
Argtemp = Arg_callee;
for (i = 1; i < tree_iter; i++)
Argtemp = Argtemp->next;
}
if (Ttemp->ptr1->nodetype == NODE_FIELD)
{
Argtemp = Arg_callee;
for (i = 1; i < tree_iter; i++)
Argtemp = Argtemp->next;
}
a = codegen(Ttemp->ptr1);
fprintf(intermediate, "PUSH R%d\n", a);
freereg();
Ttemp = Ttemp->ptr2;
tree_iter--;
}
if (Ttemp->nodetype == NODE_ID)
{
Argtemp = Arg_callee;
for (i = 1; i < tree_iter; i++)
Argtemp = Argtemp->next;
}
if (Ttemp->nodetype == NODE_FIELD)
{
Argtemp = Arg_callee;
for (i = 1; i < tree_iter; i++)
Argtemp = Argtemp->next;
}
a = codegen(Ttemp);
fprintf(intermediate, "PUSH R%d\n", a);
freereg();
}
else if (root->nodetype == DEFAULT)
{
codegen(root->ptr1);
codegen(root->ptr2);
}
else
{
temp = root;
switch (temp->nodetype)
{
case NODE_LE:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "LE R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_GE:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "GE R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_LT:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "LT R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_GT:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "GT R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_DEQ:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "EQ R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_NEQ:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "NE R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_AND:
r1 = codegen(temp->ptr1);
r2 = getreg();
fprintf(intermediate, "MOV R%d,1\n", r2);
l1 = getlabel();
fprintf(intermediate, "JZ R%d,L%d\n", r1, l1);
r3 = codegen(temp->ptr2);
fprintf(intermediate, "MOV R%d,R%d\n", r2, r3);
freereg();
fprintf(intermediate, "L%d:\n", l1);
fprintf(intermediate, "MUL R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_OR:
r1 = codegen(temp->ptr1);
r2 = getreg();
fprintf(intermediate, "MOV R%d,1\n", r2);
l1 = getlabel();
fprintf(intermediate, "JNZ R%d,L%d\n", r1, l1);
r3 = codegen(temp->ptr2);
fprintf(intermediate, "MOV R%d,R%d\n", r2, r3);
freereg();
fprintf(intermediate, "L%d:\n", l1);
fprintf(intermediate, "ADD R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_NOT:
r1 = codegen(temp->ptr2);
l1 = getlabel();
fprintf(intermediate, "JNZ R%d,L%d\n", r1, l1);
fprintf(intermediate, "MOV R%d,1\n", r1);
l2 = getlabel();
fprintf(intermediate, "JMP L%d\n", l2);
fprintf(intermediate, "L%d:\n", l1);
fprintf(intermediate, "MOV R%d,0\n", r1);
fprintf(intermediate, "L%d:\n", l2);
return r1;
case NODE_ID:
r1 = getreg();
Ltemp = LLookup(temp->name);
if (Ltemp != NULL)
{
Ltemp = Lhead;
Loffset = 0;
while (strcmp(temp->name, Ltemp->name) != 0)
{
Loffset = Loffset + 1;
Ltemp = Ltemp->next;
}
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
fprintf(intermediate, "MOV R%d,%d\n", r1, Loffset + 1);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
if (isamp)
{
fprintf(intermediate, "MOV R%d,R%d\n", r1, r2);
isamp = 0;
}
else
{
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
if (fld)
{
fprintf(intermediate, "MOV R%d,R%d\n", r1, r2);
fld = 0;
}
}
freereg();
}
else
{
Argtemp = PLookup(temp->name);
// BRING THIGS FROM STACK
if (Argtemp != NULL)
{
Argtemp = Phead;
offset = 0;
while (strcmp(Argtemp->name, temp->name) != 0)
{
offset = offset + 1;
Argtemp = Argtemp->next;
}
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
r3 = getreg();
fprintf(intermediate, "MOV R%d,2\n", r3);
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
fprintf(intermediate, "MOV R%d,%d\n", r3, (offset + 1));
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
freereg();
if (isamp || fld)
{
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2); //BP-2-(offset+1)
isamp = 0;
fld = 0;
}
else
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2); //BP-2-(offset+1)
freereg();
}
else
{
if (isamp)
{
fprintf(intermediate, "MOV R%d,%d\n", r1, (temp->Gentry->binding));
isamp = 0;
}
else
{
fprintf(intermediate, "MOV R%d,[%d]\n", r1, (temp->Gentry->binding));
if (fld)
{
fprintf(intermediate, "MOV R%d,%d\n", r1, (temp->Gentry->binding));
fld = 0;
}
}
}
}
return r1;
break;
case NODE_FIELD:
r1 = getreg();
Ltemp = LLookup(temp->name);
if (Ltemp != NULL)
{
Ltemp = Lhead;
Loffset = 0;
while (strcmp(temp->name, Ltemp->name) != 0)
{
Loffset = Loffset + 1;
Ltemp = Ltemp->next;
}
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
fprintf(intermediate, "MOV R%d,%d\n", r1, Loffset + 1);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
freereg();
fldtemp2 = fldtemp1 = Ltemp->type->fields;
flditer = 0;
temp1 = temp;
while (temp1->ptr2 != NULL)
{
flditer = 1;
fldtemp2 = fldtemp1;
while (fldtemp2 != NULL)
{
if (strcmp(fldtemp2->name, temp1->ptr2->name) == 0)
{
r2 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r2, flditer);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
freereg();
break;
}
flditer++;
fldtemp2 = fldtemp2->next;
}
temp1 = temp1->ptr2;
}
if (fld == 1)
{
fprintf(intermediate, "MOV R%d,R%d\n", r1, r2);
fld = 0;
}
}
else
{
Argtemp = PLookup(temp->name);
if (Argtemp != NULL)
{
Argtemp = Phead;
offset = 0;
while (strcmp(Argtemp->name, temp->name) != 0)
{
offset = offset + 1;
Argtemp = Argtemp->next;
}
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
r3 = getreg();
fprintf(intermediate, "MOV R%d,2\n", r3);
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
fprintf(intermediate, "MOV R%d,%d\n", r3, (offset + 1));
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
freereg();
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2); //BP-2-(offset+1)
freereg();
fldtemp2 = fldtemp1 = Argtemp->type->fields;
flditer = 0;
temp1 = temp;
while (temp1->ptr2 != NULL)
{
flditer = 1;
fldtemp2 = fldtemp1;
while (fldtemp2 != NULL)
{
if (strcmp(fldtemp2->name, temp1->ptr2->name) == 0)
{
r2 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r2, flditer);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
freereg();
break;
}
flditer++;
fldtemp2 = fldtemp2->next;
}
temp1 = temp1->ptr2;
}
if (fld == 1)
{
fprintf(intermediate, "MOV R%d,R%d\n", r1, r2);
fld = 0;
}
}
else
{
fprintf(intermediate, "MOV R%d,[%d]\n", r1, (temp->Gentry->binding));
fldtemp2 = fldtemp1 = temp->Gentry->type->fields;
flditer = 0;
temp1 = temp;
while (temp1->ptr2 != NULL)
{
flditer = 1;
fldtemp2 = fldtemp1;
while (fldtemp2 != NULL)
{
if (strcmp(fldtemp2->name, temp1->ptr2->name) == 0)
{
r2 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r2, flditer);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
freereg();
break;
}
flditer++;
fldtemp2 = fldtemp2->next;
}
temp1 = temp1->ptr2;
}
if (fld == 1)
{
fprintf(intermediate, "MOV R%d,R%d\n", r1, r2);
fld = 0;
}
}
}
return r1;
break;
case NODE_ARRAY:
fld_backup = fld;
fld = 0;
offset = codegen(temp->ptr2);
fld = fld_backup;
r1 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r1, (temp->ptr1->Gentry->binding));
fprintf(intermediate, "ADD R%d,R%d\n", r1, offset);
fprintf(intermediate, "MOV R%d,[R%d]\n", offset, r1);
if (fld)
{
fprintf(intermediate, "MOV R%d,R%d\n", offset, r1);
fld = 0;
}
freereg();
return offset;
break;
case NODE_NUM:
r1 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r1, (root->value));
return r1;
break;
case NODE_STRVAL:
r1 = getreg();
fprintf(intermediate, "MOV R%d,\"%s\"\n", r1, (root->name));
return r1;
break;
case NODE_PLUS:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "ADD R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_MINUS:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "SUB R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_MUL:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "MUL R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_DIV:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "DIV R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_MOD:
r1 = codegen(temp->ptr1);
r2 = codegen(temp->ptr2);
fprintf(intermediate, "MOD R%d,R%d\n", r1, r2);
freereg();
return r1;
break;
case NODE_ASGN:
number = codegen(temp->ptr2);
if (temp->ptr1->nodetype == NODE_FIELD)
{
fld = 1;
r1 = codegen(temp->ptr1);
fprintf(intermediate, "MOV [R%d],R%d\n", r1, number);
freereg();
}
else
{
Ltemp = LLookup(temp->ptr1->name);
if (Ltemp != NULL)
{
Ltemp = Lhead;
Loffset = 0;
while (strcmp(temp->ptr1->name, Ltemp->name) != 0)
{
Loffset = Loffset + 1;
Ltemp = Ltemp->next;
}
r1 = getreg();
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
fprintf(intermediate, "MOV R%d,%d\n", r1, Loffset + 1);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV [R%d],R%d\n", r2, number);
freereg();
freereg();
}
else
{
Argtemp = PLookup(temp->ptr1->name);
// BRING THIGS FROM STACK
if (Argtemp != NULL)
{
Argtemp = Phead;
offset = 0;
while (strcmp(Argtemp->name, temp->ptr1->name) != 0)
{
offset = offset + 1;
Argtemp = Argtemp->next;
}
r1 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r1);
r2 = getreg();
fprintf(intermediate, "MOV R%d,2\n", r2);
fprintf(intermediate, "SUB R%d,R%d\n", r1, r2);
fprintf(intermediate, "MOV R%d,%d\n", r2, (offset + 1));
fprintf(intermediate, "SUB R%d,R%d\n", r1, r2);
freereg();
fprintf(intermediate, "MOV [R%d],R%d\n", r1, number); //BP-2-(offset+1)
freereg();
}
else
fprintf(intermediate, "MOV [%d],R%d\n", (temp->ptr1->Gentry->binding), number);
}
}
freereg();
break;
case NODE_ARRAY_ASGN:
offset1 = codegen(temp->ptr2);
r1 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r1, (temp->ptr1->Gentry->binding));
fprintf(intermediate, "ADD R%d,R%d\n", offset1, r1);
freereg();
r1 = codegen(temp->ptr3);
fprintf(intermediate, "MOV [R%d],R%d\n", offset1, r1);
freereg();
freereg();
break;
case NODE_READ:
temporary = 0;
if (temp->ptr2->nodetype == NODE_FIELD)
{
fld = 1;
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
fprintf(intermediate, "MOV R0,\"Read\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Read"
fprintf(intermediate, "MOV R0,-1\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
r2 = codegen(temp->ptr2);
fprintf(intermediate, "PUSH R%d\n", r2); //Argument 2
freereg();
temporary++;
status = counter;
}
else
{
Ltemp = LLookup(temp->ptr2->name);
if (Ltemp != NULL)
{
Ltemp = Lhead;
Loffset = 0;
while (strcmp(temp->ptr2->name, Ltemp->name) != 0)
{
Loffset = Loffset + 1;
Ltemp = Ltemp->next;
}
r2 = getreg();
r3 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r3);
fprintf(intermediate, "MOV R%d,%d\n", r2, Loffset + 1);
fprintf(intermediate, "ADD R%d,R%d\n", r3, r2);
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
fprintf(intermediate, "MOV R0,\"Read\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Read"
fprintf(intermediate, "MOV R0,-1\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
fprintf(intermediate, "PUSH R%d\n", r3); //Argument 2
freereg();
temporary++;
freereg();
temporary++;
status = counter;
}
else
{
Argtemp = PLookup(temp->ptr2->name);
if (Argtemp != NULL)
{
Argtemp = Phead;
offset = 0;
while (strcmp(Argtemp->name, temp->ptr2->name) != 0)
{
offset = offset + 1;
Argtemp = Argtemp->next;
}
r2 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r2);
r3 = getreg();
fprintf(intermediate, "MOV R%d,2\n", r3);
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
fprintf(intermediate, "MOV R%d,%d\n", r3, (offset + 1));
fprintf(intermediate, "SUB R%d,R%d\n", r2, r3);
freereg();
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
fprintf(intermediate, "MOV R0,\"Read\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Read"
fprintf(intermediate, "MOV R0,-1\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
fprintf(intermediate, "PUSH R%d\n", r2); //Argument 2
freereg();
temporary++;
status = counter;
}
else
{
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
fprintf(intermediate, "MOV R0,\"Read\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Read"
fprintf(intermediate, "MOV R0,-1\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
fprintf(intermediate, "MOV R0,%d\n", (temp->ptr2->Gentry->binding));
fprintf(intermediate, "PUSH R0\n"); //Argument 2
status = counter;
}
}
}
fprintf(intermediate, "ADD SP,2\n");
freeallreg();
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
for (i = temporary; i > 0; i--)
fprintf(intermediate, "POP R0\n");
for (i = status; i >= 0; i--)
fprintf(intermediate, "POP R%d\n", i);
counter = status;
break;
case NODE_ARRAY_READ:
temporary = 0;
offset = codegen(temp->ptr3);
r1 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r1, (temp->ptr2->Gentry->binding));
r2 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r2, (temp->ptr2->Gentry->size));
fprintf(intermediate, "GT R%d,R%d\n", r2, offset);
l1 = getlabel();
fprintf(intermediate, "JNZ R%d,L%d\n", r2, l1);
fprintf(intermediate, "INT 10\n");
fprintf(intermediate, "L%d:\n", l1);
freereg();
fprintf(intermediate, "ADD R%d,R%d\n", offset, r1);
freereg();
fprintf(intermediate, "MOV [2044],R%d\n", offset); // The address of the reg to be read is stored
// in 2044 and this passed as an argument to
// read system call
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
fprintf(intermediate, "MOV R0,\"Read\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Read"
fprintf(intermediate, "MOV R0,-1\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
fprintf(intermediate, "MOV R0,[2044]\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 2
freereg();
temporary++;
status = counter;
fprintf(intermediate, "ADD SP,2\n");
freeallreg();
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
for (i = temporary; i > 0; i--)
fprintf(intermediate, "POP R0\n");
for (i = status; i >= 0; i--)
fprintf(intermediate, "POP R%d\n", i);
counter = status;
temporary = 0;
break;
case NODE_WRITE:
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
fprintf(intermediate, "MOV R0,\"Write\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Write"
fprintf(intermediate, "MOV R0,-2\n");
fprintf(intermediate, "PUSH R0\n"); //Argument 1
number = codegen(temp->ptr2);
fprintf(intermediate, "PUSH R%d\n", number); //Argument 2
freereg();
fprintf(intermediate, "ADD SP,2\n");
freeallreg();
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
for (i = status; i >= 0; i--)
fprintf(intermediate, "POP R%d\n", i);
counter = status;
break;
case NODE_IF:
l1 = getlabel();
number = codegen(temp->ptr1);
fprintf(intermediate, "JZ R%d,L%d\n", number, l1);
number = codegen(temp->ptr2);
fprintf(intermediate, "L%d:\n", l1);
freereg();
break;
case NODE_IF_ELSE:
number = codegen(temp->ptr1);
l1 = getlabel();
l2 = getlabel();
fprintf(intermediate, "JZ R%d,L%d\n", number, l1);
freereg();
number = codegen(temp->ptr2);
fprintf(intermediate, "JMP L%d\n", l2);
fprintf(intermediate, "L%d:\n", l1);
freereg();
number = codegen(temp->ptr3);
fprintf(intermediate, "L%d:\n", l2);
break;
case NODE_WHILE:
l1 = getlabel();
l2 = getlabel();
w1 = l1;
w2 = l2;
fprintf(intermediate, "L%d:\n", l1);
number = codegen(temp->ptr1);
fprintf(intermediate, "JZ R%d,L%d\n", number, l2);
freereg();
number = codegen(temp->ptr2);
fprintf(intermediate, "JMP L%d\n", l1);
fprintf(intermediate, "L%d:\n", l2);
freereg();
break;
case NODE_FUNC:
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
freeallreg();
if (temp->ptr3 == NULL && temp->ptr2 == NULL)
{
}
else if (temp->ptr2 != NULL)
{
codegen(temp->ptr2); //more than 1 argument
}
else
{
if ((temp->ptr3->nodetype == NODE_ID) || (temp->ptr3->nodetype == NODE_FIELD) || (temp->ptr3->nodetype == NODE_ARRAY))
Argtemp = temp->ptr3->ptr3;
a = codegen(temp->ptr3);
fprintf(intermediate, "PUSH R%d\n", a);
freereg();
}
fprintf(intermediate, "PUSH R0\n"); //space for return value
Gtemp = GLookup(temp->name);
fprintf(intermediate, "CALL F%d\n", Gtemp->binding);
r1 = status + 1;
fprintf(intermediate, "POP R%d\n", r1); // for return value
if (status == -1)
r2 = getreg();
r2 = getreg();
Argtemp = Gtemp->paramlist;
temporary = 0;
while (Argtemp != NULL)
{
temporary = temporary + 1;
fprintf(intermediate, "POP R%d\n", r2);
Argtemp = Argtemp->next;
}
if (status == -1)
freereg();
freereg();
for (i = status; i >= 0; i--)
{
temporary = temporary + 1;
fprintf(intermediate, "POP R%d\n", i);
}
counter = status;
r1 = getreg();
return r1;
break;
case NODE_RET:
res = codegen(temp->ptr2);
r1 = getreg();
fprintf(intermediate, "MOV R%d,BP\n", r1);
r2 = getreg();
fprintf(intermediate, "MOV R%d,2\n", r2);
fprintf(intermediate, "SUB R%d,R%d\n", r1, r2);
freereg();
fprintf(intermediate, "MOV [R%d],R%d\n", r1, res);
freereg();
freereg();
Ltemp = Lhead;
while (Ltemp != NULL)
{
fprintf(intermediate, "POP R0\n");
Ltemp = Ltemp->next;
}
fprintf(intermediate, "MOV BP,[SP]\n");
fprintf(intermediate, "POP R0\n");
fprintf(intermediate, "RET\n");
break;
case NODE_BRK:
fprintf(intermediate, "JMP L%d\n", w2);
break;
case NODE_CONTINUE:
fprintf(intermediate, "JMP L%d\n", w1);
break;
case NODE_BRKP:
fprintf(intermediate, "BRKP\n");
break;
case NODE_ALLOC:
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
freeallreg();
fprintf(intermediate, "MOV R0,\"Alloc\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Alloc"
fprintf(intermediate, "MOV R0,8\n");
fprintf(intermediate, "PUSH R0\n"); // size, Arg 1
fprintf(intermediate, "ADD SP,2\n");
fprintf(intermediate, "PUSH R0\n"); //return value
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
temporary = 0;
for (i = status; i >= 0; i--)
{
temporary = temporary + 1;
fprintf(intermediate, "POP R%d\n", i);
}
counter = status;
r1 = getreg();
r2 = getreg();
fprintf(intermediate, "MOV R%d,%d\n", r1, (temporary + 5));
fprintf(intermediate, "MOV R%d,SP\n", r2);
fprintf(intermediate, "ADD R%d,R%d\n", r2, r1);
fprintf(intermediate, "MOV R%d,[R%d]\n", r1, r2);
freereg();
return r1;
break;
case NODE_FREE:
r1 = getreg();
r1 = codegen(temp->ptr2);
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
freeallreg();
fprintf(intermediate, "MOV R0,\"Free\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Free"
fprintf(intermediate, "PUSH R%d\n", r1); // Argument 1
fprintf(intermediate, "ADD SP,2\n");
fprintf(intermediate, "PUSH R0\n"); // return value
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
for (i = status; i >= 0; i--)
fprintf(intermediate, "POP R%d\n", i);
counter = status;
return 0;
break;
case NODE_NILL:
r1 = getreg();
fprintf(intermediate, "MOV R%d,-1\n", r1);
return r1;
break;
case NODE_INIT:
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
freeallreg();
fprintf(intermediate, "MOV R0,\"Heapset\"\n");
fprintf(intermediate, "PUSH R0\n"); // function code "Initialize"
fprintf(intermediate, "ADD SP,3\n");
fprintf(intermediate, "PUSH R0\n"); // return value
fprintf(intermediate, "CALL 0\n");
fprintf(intermediate, "SUB SP,5\n");
for (i = status; i >= 0; i--)
fprintf(intermediate, "POP R%d\n", i);
counter = status;
return 0;
break;
case NODE_EXPOSCALL:
for (i = 0; i <= counter; i++)
fprintf(intermediate, "PUSH R%d\n", i);
status = counter;
freeallreg();
temp1 = temp->ptr3;
arg_count = 0;
if (strcmp(temp1->name, "Write") == 0)
we1 = 1;
if (strcmp(temp1->name, "Read") == 0)
we2 = 1;
if (temp1->nodetype == NODE_STRVAL)
{
fprintf(intermediate, "MOV R0,\"%s\"\n", temp1->name);
fprintf(intermediate, "PUSH R0\n"); //function code
}
else if (temp1->nodetype == NODE_ID)
{
number = codegen(temp1);
fprintf(intermediate, "MOV R0,R%d\n", number);
fprintf(intermediate, "PUSH R0\n"); //function code
}
arg_count++;
temp1 = temp1->ptr1;
while (temp1 != NULL)
{
if (temp1->nodetype == NODE_STRVAL)
fprintf(intermediate, "MOV R0,\"%s\"\n", temp1->name);
else if (temp1->nodetype == NODE_NUM)
fprintf(intermediate, "MOV R0,%d\n", temp1->value);
else if (temp1->nodetype == NODE_ID)
{
if ((arg_count == 2) && (we2))
{
fld = 1;
we2 = 0; //put junk value in we2
}
number = codegen(temp1);
fprintf(intermediate, "MOV R0,R%d\n", number);
}
else if (temp1->nodetype == NODE_ARRAY)
{
if ((arg_count == 2) && (we2))
{
fld = 1;
we2 = 0; //put junk value in we2
}
number = codegen(temp1);
fprintf(intermediate, "MOV R0,R%d\n", number);
}
else if (temp1->nodetype == NODE_FIELD)