Ejemplo n.º 1
0
/* 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);
                 
    }
}
Ejemplo n.º 2
0
/* 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);
    }

}
Ejemplo n.º 3
0
/* 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);
  }
}