void Assignment() {
char Name = GetName();
Match('=');
BoolExpression();
sprintf(tmp, "mov [%c], rax", Name);
EmitLn(tmp);
}
void Assignment() {
char Name[100];
strcpy(Name, Value);
Match('=');
BoolExpression();
Store(Name);
}
void DoWhile(void)
{
char code[MAXMSG];
char l1[MAXLBL];
char l2[MAXLBL];
Match('w');
NewLabel();
strncpy(l1, label, MAXLBL);
NewLabel();
strncpy(l2, label, MAXLBL);
PostLabel(l1);
BoolExpression();
snprintf(code, MAXMSG, "je .%s", l2);
EmitLn(code);
Block(l2);
Match('e'); // ENDWHILE
printf("#ENDWHILE\n");
snprintf(code, MAXMSG, "jmp .%s", l1);
EmitLn(code);
PostLabel(l2);
}
void DoIf(char *L)
{
char L1[MAX_BUF];
char L2[MAX_BUF];
strcpy(L1, NewLabel());
strcpy(L2, L1);
Match('i');
BoolExpression();
sprintf(tmp, "jz %s", L1);
EmitLn(tmp);
Block(L);
dprint("DoIf: Got Look = %c\n", Look);
if (Look == 'l') {
/* match *else* statement */
Match('l');
strcpy(L2, NewLabel());
sprintf(tmp, "jmp %s", L2);
EmitLn(tmp);
PostLabel(L1);
Block(L);
}
Match('e');
PostLabel(L2);
}
void DoIf(char *exit_label)
{
char code[MAXMSG];
char l1[MAXLBL];
char l2[MAXLBL];
Match('i');
printf("# IF\n");
NewLabel();
strncpy(l1, label, MAXLBL);
strncpy(l2, label, MAXLBL);
BoolExpression();
snprintf(code, MAXMSG, "je .%s", l1);
EmitLn(code);
printf("# TRUE\n");
// here, tutorial 05 only matches 'e' once, after the if statement
// this doesn't seem to work unless i add Look=='l' to the test in
// Blocks().
Block(exit_label);
if (Look=='l') {
Match('l');
printf("#ELSE\n");
NewLabel();
strncpy(l2, label, MAXLBL);
snprintf(code, MAXMSG, "jmp .%s", l2);
EmitLn(code);
PostLabel(l1);
Block(exit_label);
}
Match('e'); // ENDIF
printf("#ENDIF\n");
PostLabel(l2);
}
void Assignment()
{
char name[MAX_BUF];
sprintf(name, Value);
Next();
MatchString("=");
BoolExpression();
Store(name);
}
void Assignment()
{
char c = GetName();
Match('=');
BoolExpression();
sprintf(tmp, "lea %c, %%ebx", c);
EmitLn(tmp);
EmitLn("movl %eax, (%ebx)");
}
void DoRepeat() {
char L[100];
Match('r');
strcpy(L, NewLabel());
PostLabel(L);
Block();
Match('u');
BoolExpression();
sprintf(tmp, "jmp %s", L);
EmitLn(tmp);
}
void Factor() {
if(Look == '(') {
Match('(');
BoolExpression();
Match(')');
}
else if(IsAlpha(Look)) {
GetName();
LoadVar(Value);
} else {
LoadConst(GetNum());
}
}
void DoWhile() {
char L1[100];
char L2[100];
strcpy(L1, NewLabel());
strcpy(L2, NewLabel());
PostLabel(L1);
BoolExpression();
BranchFalse(L2);
Block();
MatchString("ENDWHILE");
Branch(L1);
PostLabel(L2);
}
void DoWhile()
{
Next();
char L1[MAX_BUF];
char L2[MAX_BUF];
sprintf(L1, NewLabel());
sprintf(L2, NewLabel());
PostLabel(L1);
BoolExpression();
BranchFalse(L2);
Block();
MatchString("ENDWHILE");
Branch(L1);
PostLabel(L2);
}
void DoRepeat()
{
char L1[MAX_BUF];
char L2[MAX_BUF];
Match('r');
strcpy(L1, NewLabel());
strcpy(L2, NewLabel());
PostLabel(L1);
Block(L2);
Match('u');
BoolExpression();
sprintf(tmp, "jz %s", L1);
EmitLn(tmp);
PostLabel(L2);
}
void DoWhile() {
char L1[100];
char L2[100];
Match('w');
strcpy(L1, NewLabel());
strcpy(L2, NewLabel());
PostLabel(L1);
BoolExpression();
sprintf(tmp, "jz %s", L2);
EmitLn(tmp);
Block();
Match('e');
sprintf(tmp, "jmp %s", L1);
EmitLn(tmp);
PostLabel(L2);
}
void Factor()
{
if (Token == '(') {
Next();
BoolExpression();
MatchString(")");
} else {
if (Token == 'x') {
LoadVar(Value);
} else if (Token == '#') {
LoadConst(Value);
} else {
Expected("Math Factor");
}
Next();
}
}
void DoIf() {
char L1[100];
char L2[100];
BoolExpression();
strcpy(L1, NewLabel());
strcpy(L2, L1);
BranchFalse(L1);
Block();
if(Token == 'l') {
Match('l');
strcpy(L2, NewLabel());
Branch(L2);
PostLabel(L1);
Block();
}
PostLabel(L2);
MatchString("ENDIF");
}
/* Recognize and Translate an IF construct */
void DoIf()
{
Next();
char L1[MAX_BUF];
char L2[MAX_BUF];
sprintf(L1, NewLabel());
sprintf(L2, L1);
BoolExpression();
BranchFalse(L1);
Block();
if (Token == 'l') {
Next();
sprintf(L2, NewLabel());
Branch(L2);
PostLabel(L1);
Block();
}
PostLabel(L2);
MatchString("ENDIF");
}
void DoIf() {
char L1[100];
char L2[100];
Match('i');
BoolExpression();
strcpy(L1, NewLabel());
strcpy(L2, L1);
sprintf(tmp, "jz %s", L1);
EmitLn(tmp);
Block();
if(Look == 'l') {
Match('l');
strcpy(L2, NewLabel());
sprintf(tmp, "jmp %s", L2);
EmitLn(tmp);
PostLabel(L1);
Block();
}
Match('e');
PostLabel(L2);
}
void DoRepeat(void)
{
char code[MAXMSG];
char l1[MAXLBL];
char l2[MAXLBL];
Match('r');
printf("# REPEAT\n");
NewLabel();
strncpy(l1, label, MAXLBL);
NewLabel();
strncpy(l2, label, MAXLBL);
PostLabel(l1);
Block(l2);
Match('u');
printf("# UNTIL\n");
BoolExpression();
snprintf(code, MAXMSG, "je .%s\t\t#repeat loop", l1);
EmitLn(code);
PostLabel(l2); // exit point
}