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Accumulator.php
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155 lines (131 loc) · 3.72 KB
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<?php
declare(strict_types=1);
namespace PHPJava\Compiler\Emulator;
use PHPJava\Compiler\Builder\Attributes\Architects\Frames\Frame;
use PHPJava\Compiler\Builder\Generator\Operation\Operation;
use PHPJava\Exceptions\EmulatorException;
use PHPJava\Utilities\DebugTool;
class Accumulator
{
protected $backtraces = [];
protected $stacks = [];
protected $locals = [];
protected $frames = [];
protected $enableStack = true;
protected $effectiveProgramCounter = 0;
/**
* @var DebugTool
*/
protected $debugTool;
public static function factory()
{
return new static();
}
public function __construct()
{
$this->debugTool = new DebugTool(__CLASS__);
}
public function popFromOperandStack()
{
$this->debugTool->getLogger()->debug(
'Popped an item, remaining stacks: ' . (count($this->stacks) - 1)
);
if ((count($this->stacks) - 1) < 0) {
// Build backtrace
$backtrace = '';
foreach ($this->backtraces as [$programCounter, $operation]) {
/**
* @var Operation $operation
*/
$backtrace .= sprintf(
"%004s\t0x%02X\t%d\t%s\n",
$programCounter,
$operation->getOpCode(),
count($operation->getOperands()),
ltrim($operation->getMnemonic(), '_')
);
}
throw new EmulatorException(
'Cannot pop an item because stack is underflow.' . "\n" .
'Backtraces: ' . "\n" .
$backtrace
);
}
if (!$this->enableStack) {
// Dup a stack
$stack = array_pop($this->stacks);
$this->stacks[] = $stack;
return $stack;
}
return array_pop($this->stacks);
}
public function pushToOperandStack($item): self
{
$this->debugTool->getLogger()->debug(
'Stack an item, remaining stacks: ' . (count($this->stacks) + 1)
);
if (!$this->enableStack) {
return $this;
}
$this->stacks[] = $item;
return $this;
}
public function getFromLocal(int $index)
{
if (!array_key_exists($index, $this->locals)) {
throw new EmulatorException(
'Cannot get an item because item is not available.'
);
}
return $this->locals[$index];
}
public function setToLocal(int $index, $value): self
{
$this->locals[$index] = $value;
return $this;
}
public function getStacks(): array
{
return $this->stacks;
}
public function getLocals(): array
{
return $this->locals;
}
public function countStacks(): int
{
return count($this->stacks);
}
public function countLocals(): int
{
return count($this->locals);
}
public function enableStack(bool $enable): self
{
$this->enableStack = $enable;
return $this;
}
public function setEffectiveProgramCounter(int $programCounter): self
{
$this->effectiveProgramCounter = $programCounter;
return $this;
}
public function getEffectiveProgramCounter(): int
{
return $this->effectiveProgramCounter;
}
public function addFrame(Frame $frame): self
{
$this->frames[] = $frame;
return $this;
}
public function getFrames(): array
{
return $this->frames;
}
public function addBacktrace(int $programCounter, Operation $operation): self
{
$this->backtraces[] = [$programCounter, $operation];
return $this;
}
}