/* Generate code for a statement list */
void genStmtList(node *stmtlist, codelabel *next)
{
if (stmtlist != NULL) {
codelabel nextstmt;
while (stmtlist->internal.child[1] != NULL){
initLabel(&nextstmt,"stmt");
genStmt(stmtlist->internal.child[0], &nextstmt);
placeLabel(&nextstmt);
stmtlist = stmtlist->internal.child[1];
}
// do the last statement
genStmt(stmtlist->internal.child[0], next);
}
}
/* generate code for an if/elseif statement */
void genIf(node *stmt, codelabel *endif)
{
node *expr = stmt->internal.child[0];
node *thenstmts = stmt->internal.child[1]; /* stmtlist */
node *elsestmt = stmt->internal.child[2]; /* Nelseif/Nelse */
codelabel elselabel;
if(elsestmt) { //make sure there is an else
initLabel(&elselabel, "else");
genCondExpr(expr, FALSE, &elselabel);
} else {
genCondExpr(expr, FALSE, endif);
}
genStmtList(thenstmts, endif);
if(elsestmt) {
outputCmd("jmp", 0);
outputLabel(endif);
placeLabel(&elselabel);
genStmt(elsestmt, endif);
}
}
/* Procedure cGen recursively generates code by
* tree traversal
*/
static void cGen( TreeNode * tree)
{ if (tree != NULL)
{ switch (tree->nodekind) {
case StmtK:
genStmt(tree);
break;
case ExpK:
genExp(tree);
break;
default:
break;
}
cGen(tree->sibling);
}
}