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ConstantPool.php
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167 lines (152 loc) · 5.2 KB
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<?php
declare(strict_types=1);
namespace PHPJava\Core\JVM;
use PHPJava\Core\Stream\Reader\ReaderInterface;
use PHPJava\Exceptions\ReadEntryException;
use PHPJava\Exceptions\ReadOnlyException;
use PHPJava\Exceptions\RuntimeException;
use PHPJava\Kernel\Maps\ConstantPoolTag;
use PHPJava\Kernel\Structures\ClassInfo;
use PHPJava\Kernel\Structures\DoubleInfo;
use PHPJava\Kernel\Structures\FieldrefInfo;
use PHPJava\Kernel\Structures\FloatInfo;
use PHPJava\Kernel\Structures\FreezableInterface;
use PHPJava\Kernel\Structures\IntegerInfo;
use PHPJava\Kernel\Structures\InterfaceMethodrefInfo;
use PHPJava\Kernel\Structures\InvokeDynamicInfo;
use PHPJava\Kernel\Structures\LongInfo;
use PHPJava\Kernel\Structures\MethodHandleInfo;
use PHPJava\Kernel\Structures\MethodrefInfo;
use PHPJava\Kernel\Structures\MethodTypeInfo;
use PHPJava\Kernel\Structures\NameAndTypeInfo;
use PHPJava\Kernel\Structures\StringInfo;
use PHPJava\Kernel\Structures\StructureInterface;
use PHPJava\Kernel\Structures\Utf8Info;
class ConstantPool implements \ArrayAccess, \Countable, \IteratorAggregate
{
/**
* @var StructureInterface[]
*/
private $entries = [];
/**
* @var ReaderInterface
*/
private $reader;
/**
* @throws ReadEntryException
*/
public function __construct(ReaderInterface $reader, int $entries)
{
$this->reader = $reader;
for ($i = 1; $i < $entries; $i++) {
$this->entries[$i] = $this->read(
$reader->getReader()->readUnsignedByte()
);
// execute
$this->entries[$i]->execute();
// Java's Long and Double problem.
if ($this->entries[$i] instanceof LongInfo ||
$this->entries[$i] instanceof DoubleInfo) {
$i++;
}
}
}
/**
* @return StructureInterface[]
*/
public function getEntries(): array
{
return $this->entries;
}
/**
* @throws ReadEntryException
*/
private function read(int $entryTag): ?StructureInterface
{
switch ($entryTag) {
case ConstantPoolTag::CONSTANT_Class:
return new ClassInfo($this->reader);
case ConstantPoolTag::CONSTANT_Fieldref:
return new FieldrefInfo($this->reader);
case ConstantPoolTag::CONSTANT_Methodref:
return new MethodrefInfo($this->reader);
case ConstantPoolTag::CONSTANT_String:
return new StringInfo($this->reader);
case ConstantPoolTag::CONSTANT_Integer:
return new IntegerInfo($this->reader);
case ConstantPoolTag::CONSTANT_Float:
return new FloatInfo($this->reader);
case ConstantPoolTag::CONSTANT_Long:
return new LongInfo($this->reader);
case ConstantPoolTag::CONSTANT_Double:
return new DoubleInfo($this->reader);
case ConstantPoolTag::CONSTANT_NameAndType:
return new NameAndTypeInfo($this->reader);
case ConstantPoolTag::CONSTANT_Utf8:
return new Utf8Info($this->reader);
case ConstantPoolTag::CONSTANT_InterfaceMethodref:
return new InterfaceMethodrefInfo($this->reader);
case ConstantPoolTag::CONSTANT_InvokeDynamic:
return new InvokeDynamicInfo($this->reader);
case ConstantPoolTag::CONSTANT_MethodHandle:
return new MethodHandleInfo($this->reader);
case ConstantPoolTag::CONSTANT_MethodType:
return new MethodTypeInfo($this->reader);
case ConstantPoolTag::CONSTANT_Module:
case ConstantPoolTag::CONSTANT_Package:
throw new ReadEntryException('Entry tag ' . sprintf('0x%04X', $entryTag) . ' is not implemented.');
}
throw new ReadEntryException('Entry tag ' . sprintf('0x%04X', $entryTag) . ' is not defined.');
}
/**
* @return bool
*/
public function offsetExists($offset)
{
return isset($this->entries[$offset]);
}
/**
* @throws RuntimeException
* @return StructureInterface
*/
public function offsetGet($offset)
{
if ($this->entries[$offset] instanceof FreezableInterface) {
$this->entries[$offset]->freeze();
}
if (!array_key_exists($offset, $this->entries)) {
throw new RuntimeException(
'Cannot refer to an entry on the Constant Pool (index: ' . $offset . ')'
);
}
return $this->entries[$offset];
}
/**
* @return int
*/
public function count()
{
return count($this->entries);
}
/**
* @throws ReadOnlyException
*/
public function offsetSet($offset, $value)
{
throw new ReadOnlyException('You cannot rewrite datum. The Constant Pool is read-only.');
}
/**
* @throws ReadOnlyException
*/
public function offsetUnset($offset)
{
throw new ReadOnlyException('You cannot rewrite datum. The Constant Pool is read-only.');
}
/**
* @return \ArrayIterator<StructureInterface>
*/
public function getIterator()
{
return new \ArrayIterator($this->entries);
}
}