void Expression(){
if (IsAddop(Look[0]))
EmitLn("CLR D0");
else
Term();
EmitLn("MOVE D0,D1");
while (IsAddop(Look[0])){
switch (Look[0]){
case '+': Add();
break;
case '-': Subtract();
break;
default:
Expected("Addop");
}
}
}
void Expression() {
Term();
while(IsAddop(Look)) {
EmitLn("push rax");
switch(Look) {
case '+': Add(); break;
case '-': Subtract(); break;
}
}
}
void Expression() {
FirstTerm();
NewLine();
while(IsAddop(Look)) {
Push();
switch(Look) {
case '+': Add(); break;
case '-': Subtract(); break;
}
NewLine();
}
}
void Expression()
{
if (IsAddop(Token)) {
Clear();
} else {
Term();
}
while(IsAddop(Token)) {
Push();
switch(Token) {
case '+':
Add();
break;
case '-':
Subtract();
break;
default:
break;
}
}
}
/* parse and tranlate an expression
* vestigial version */
char Expression()
{
char type;
if (IsAddop(Look)) {
type = Unop();
} else {
type = Term();
}
while(IsAddop(Look)) {
Push(type);
switch (Look) {
case '+':
type = Add(type);
break;
case '-':
type = Subtract(type);
break;
default:
break;
}
}
return type;
}
void Expression()
{
FirstTerm();
while(IsAddop(Look)) {
EmitLn("pushl %eax");
switch (Look) {
case '+':
Add();
break;
case '-':
Subtract();
break;
default:
Expected("Addop");
}
}
}
void Factor()
{
if(Look == '(') {
Match('(');
Expression();
Match(')');
} else if(IsAddop(Look)) {
Match('-');
sprintf(tmp,"movl $%c, %%eax", GetNum());
EmitLn(tmp);
EmitLn("negl %eax");
} else {
sprintf(tmp,"movl $%c, %%eax", GetNum());
EmitLn(tmp);
}
}
void Expression()
{
if(IsAddop(Look))
EmitLn("xor %eax, %eax");
else
Term();
while (strchr("+-", Look)) {
EmitLn("pushl %eax");
switch(Look)
{
case '+':
Add();
break;
case '-':
Substract();
break;
default:
Expected("Addop");
}
}
}
