public function gen()
{
$ir = "";
$leftname = "\\Codegen\\Generator\\" . \Misc::baseClass($this->obj->left);
$left = new $leftname($this->obj->left);
$ir .= $left->gen();
$rightname = "\\Codegen\\Generator\\" . \Misc::baseClass($this->obj->right);
$right = new $rightname($this->obj->right);
$ir .= $right->gen();
$leftreg = \Tables::$register_alloc - 1;
$rightreg = $leftreg + 1;
if ($this->obj->left instanceof \Parser\Parsers\Integer) {
$reg1 = \Tables::alloc();
/* holds the left value */
$ir .= "\t%{$reg1} = load i32* %{$leftreg}" . PHP_EOL;
} else {
$reg1 = $leftreg;
}
if ($this->obj->right instanceof \Parser\Parsers\Integer) {
$reg2 = \Tables::alloc();
/* holds the right value */
$ir .= "\t%{$reg2} = load i32* %{$rightreg}" . PHP_EOL;
} else {
$reg2 = $rightreg;
}
$reg3 = \Tables::alloc();
/* holds the result */
$ir .= "\t%{$reg3} = sub nsw i32 %{$reg1}, %{$reg2}" . PHP_EOL;
$this->resultreg = $reg3;
return $ir;
}
public function gen()
{
$ir = "";
foreach ($this->ast as $item) {
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($item);
$gen = new $name($item);
$ir .= $gen->gen();
}
return $ir;
}
public function gen()
{
if (is_object($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 gen()
{
$ir = "";
if (\Tables::declaration($this->obj->name) || \Tables::func($this->obj->name)) {
$gen = array();
$ir .= "\t; prepare the arguments" . PHP_EOL;
for ($i = 0; $i < count($this->obj->content); $i++) {
$arg = $this->obj->content[$i];
if (\Misc::baseClass($arg) == "Addition" || \Misc::baseClass($arg) == "Subtraction" || \Misc::baseClass($arg) == "Multiplication" || \Misc::baseClass($arg) == "Division" || \Misc::baseClass($arg) == "Call") {
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($arg);
$obj = new $name($arg);
$ir .= $obj->gen();
$gen[$i] = $obj;
}
}
if (\Tables::declaration($this->obj->name)) {
$dec = \Tables::getDeclaration($this->obj->name);
} elseif (\Tables::func($this->obj->name)) {
$dec = \Tables::getFunc($this->obj->name);
}
$reg = \Tables::alloc();
$this->result = $reg;
$ir .= "\t; call {$dec->name}" . PHP_EOL;
if (empty($dec->args)) {
$ir .= "\t%{$reg} = call {$dec->return} @{$dec->name}";
} else {
$ir .= "\t%{$reg} = call {$dec->return} {$dec->args}* @{$dec->name}";
}
if (count($this->obj->content) > 0) {
for ($i = 0; $i < count($this->obj->content); $i++) {
$arg = $this->obj->content[$i];
if (isset($gen[$i]) && !empty($gen[$i])) {
$obj = $gen[$i];
} else {
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($arg);
$obj = new $name($arg);
}
$ir .= $obj->arg() . ", ";
}
$ir = substr($ir, 0, -2);
}
$ir .= ")" . PHP_EOL;
$ir .= "\t; end of call to {$dec->name}" . PHP_EOL . PHP_EOL;
} else {
error("unknown function in line {$this->obj->line}");
}
return $ir;
}
public function gen()
{
$ir = "";
$item = $this->obj->content[0];
if ($item instanceof \Parser\Parsers\Integer) {
$ir .= "\tret i32 {$item->value}" . PHP_EOL;
} elseif ($item instanceof \Parser\Parsers\Variable) {
$val = new \Codegen\Generator\Variable($item);
$ir .= "\tret " . $val->arg() . PHP_EOL;
/* TODO: maybe have a function that checks for arithmetic parsers/codegenerators? */
} elseif ($item instanceof \Parser\Parsers\Addition || $item instanceof \Parser\Parsers\Subtraction || $item instanceof \Parser\Parsers\Multiplication || $item instanceof \Parser\Parsers\Division) {
$name = "\\Codegen\\Generator\\" . \Misc::baseClass($item);
$val = new $name($item);
$ir .= $val->gen();
$ir .= "\tret i32 %" . \Tables::$register_alloc . PHP_EOL;
} else {
error("invalid return type '" . \Misc::baseClass($item) . "' in line {$this->obj->line}");
}
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;
}
}
}
}
}
