public function gen()
{
if (is_object($this->obj->content[0])) {
/* it is a arithmetic expression */
$ir = "";
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($this->obj->content[0]);
$obj = new $name($this->obj->content[0]);
$var =& \Tables::updateLocalVariable($this->obj->function, $this->obj->name);
$ir .= $obj->gen();
for ($i = 0; $i <= $this->obj->line; $i++) {
if (isset($var->type[$i])) {
$type = $var->type[$i];
}
}
$var->type[$this->obj->line] = $type | \Tables::POINTER;
$var->type[$this->obj->line] &= ~\Tables::POINTER;
$var->name = \Tables::$register_alloc;
} elseif (!is_null(\Tables::localVariable($this->obj->function, $this->obj->name))) {
/* allocate and get everything ready */
$reg1 = \Tables::alloc();
/* the reg number */
$reg2 = \Tables::alloc();
/* the reg number */
$var =& \Tables::updateLocalVariable($this->obj->function, $this->obj->name);
/* our reference to the variable */
/* get the correct type */
for ($i = 0; $i <= $this->obj->line; $i++) {
if (isset($var->type[$i])) {
$type = $var->type[$i];
}
}
$type = \Misc::getType($type);
/* its type */
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($this->obj->content[0]);
$obj = new $name($this->obj->content[0]);
/* the code that is to be moved into the reg */
$code = $obj->arg();
/* change the name of the variable to the new register */
$var->name = $reg2;
/* generate the code */
$ir = "\t%{$reg1} = alloca {$type}" . PHP_EOL;
/* allocate the register */
$ir .= "\tstore " . $code . ", {$type}* %{$reg1}" . PHP_EOL;
/* store our value in it */
$ir .= "\t%{$reg2} = load {$type}* %{$reg1}" . PHP_EOL;
/* move it into a register we don't have to reference it as a pointer */
}
return $ir;
}
public function analyze($ast, $parent = NULL)
{
/* holds the name of the currently compiled function */
$function = "";
foreach ($ast as $i => $node) {
/* set the function name in the objects */
if ($node instanceof \Parser\Parsers\FunctionDefinition) {
$function = $node->name;
$node->function = $node->name;
} elseif (!empty($node->function)) {
$function = $node->function;
} else {
if (isset($node->name) && $node->name == "extern") {
continue;
} elseif (!empty($function)) {
$node->function = $function;
} else {
if (!empty($parent->function)) {
$node->function = $parent->function;
} elseif (!empty($function)) {
$node->function = $function;
}
}
}
/* set the arguments as local variables */
if ($node instanceof \Parser\Parsers\FunctionDefinition && count($node->arguments) > 0) {
foreach ($node->arguments as $arg) {
\Tables::addLocalVariable($function, $arg->name);
}
}
if ($node instanceof \Parser\Parsers\Assignment) {
/* deal with assignments */
if (is_object($node->content)) {
if (\Tables::localVariable($node->function, $node->name)) {
$var =& \Tables::updateLocalVariable($node->function, $node->name);
} else {
$var =& \Tables::addLocalVariable($node->function, $node->name);
}
$var->type[$node->line] = \Tables::I32;
continue;
}
switch (\Misc::baseClass($node->content[0])) {
case "String":
$type = \Tables::STRING;
break;
case "Integer":
$type = \Tables::I32;
break;
case "Addition":
case "Subtraction":
case "Multiplication":
case "Division":
$type = \Tables::I32;
break;
default:
error("unknown assignment type '" . \Misc::baseClass($node->content[0]) . "' in line {$node->line}");
}
if (\Tables::localVariable($node->function, $node->name)) {
$var =& \Tables::updateLocalVariable($node->function, $node->name);
} else {
$var =& \Tables::addLocalVariable($node->function, $node->name);
}
$var->type[$node->line] = $type;
} elseif (!$node instanceof \Parser\Parsers\Variable && count($node->content) > 0) {
/* analyze recursively if needed */
if ($node instanceof \Parser\Parsers\FunctionDefinition && !empty($node->arguments)) {
foreach ($node->arguments as $arg) {
$arg->function = $function;
}
}
$this->analyze($node->content, $node);
} elseif ($node instanceof \Parser\Parsers\Variable) {
/* do type inference based on printf */
if ($parent instanceof \Parser\Parsers\Call) {
if ($parent->name == "printf") {
$matches = array();
preg_match_all("/%[scdiu]/", $ast[0]->string, $matches);
$format = substr($matches[0][$i - 1], -1);
$type = 0;
switch ($format) {
case 'd':
case 'i':
case 'c':
$type |= \Tables::I32;
break;
case 's':
$type |= \Tables::STRING;
}
$var =& \Tables::updateLocalVariable($node->function, $node->name);
if ($var == NULL) {
continue;
}
$node->type[$node->line] = $type;
}
}
}
}
}
