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<?php
declare(strict_types=1);
namespace Nsfisis\Waddiwasi\Execution;
use Nsfisis\Waddiwasi\Structure\Types\RefType;
final class Stack
{
/**
* @var list<StackEntries\Frame>
*/
private array $frames = [];
/**
* @param list<StackEntry> $entries
*/
public function __construct(
private array $entries,
) {
}
public function pushFrame(StackEntries\Frame $frame): void
{
$this->push($frame);
$this->frames[] = $frame;
}
public function pushLabel(StackEntries\Label $label): void
{
$this->push($label);
}
public function pushValue(Val $val): void
{
$this->push(StackEntry::Value($val));
}
public function pushBool(bool $value): void
{
$this->pushValue(Val::NumI32((int)$value));
}
/**
* @param S32 $value
*/
public function pushI32(int $value): void
{
$this->pushValue(Val::NumI32($value));
}
/**
* @param S64 $value
*/
public function pushI64(int $value): void
{
$this->pushValue(Val::NumI64($value));
}
/**
* @param F32 $value
*/
public function pushF32(float $value): void
{
$this->pushValue(Val::NumF32($value));
}
/**
* @param F64 $value
*/
public function pushF64(float $value): void
{
$this->pushValue(Val::NumF64($value));
}
public function pushRefNull(RefType $type): void
{
$this->pushValue(Val::RefNull($type));
}
public function pushRefFunc(FuncAddr $addr): void
{
$this->pushValue(Val::RefFunc($addr));
}
public function pushRefExtern(ExternAddr $addr): void
{
$this->pushValue(Val::RefExtern($addr));
}
public function popFrame(): StackEntries\Frame
{
$result = $this->pop();
assert($result instanceof StackEntries\Frame);
array_pop($this->frames);
return $result;
}
public function popValue(): Val
{
$result = $this->pop();
assert($result instanceof StackEntries\Value, 'Expected a value on the stack, but got ' . print_r($result, true));
return $result->inner;
}
/**
* @return list<Val>
*/
public function popNValues(int $n): array
{
$results = [];
for ($i = 0; $i < $n; $i++) {
$results[] = $this->popValue();
}
return $results;
}
/**
* @return S32
*/
public function popI32(): int
{
$v = $this->popValue();
assert($v instanceof Vals\Num);
assert($v->inner instanceof Nums\I32);
return $v->inner->value;
}
/**
* @return S64
*/
public function popI64(): int
{
$v = $this->popValue();
assert($v instanceof Vals\Num);
assert($v->inner instanceof Nums\I64);
return $v->inner->value;
}
/**
* @return F32
*/
public function popF32(): float
{
$v = $this->popValue();
assert($v instanceof Vals\Num);
assert($v->inner instanceof Nums\F32_);
return $v->inner->value;
}
/**
* @return F64
*/
public function popF64(): float
{
$v = $this->popValue();
assert($v instanceof Vals\Num);
assert($v->inner instanceof Nums\F64_);
return $v->inner->value;
}
public function popRef(): Ref
{
$v = $this->popValue();
assert($v instanceof Vals\Ref);
return $v->inner;
}
/**
* @return list<Val>
*/
public function popValuesToLabel(): array
{
$results = [];
while (!$this->isEmpty()) {
$top = $this->pop();
if ($top instanceof StackEntries\Value) {
$results[] = $top->inner;
} else {
assert($top instanceof StackEntries\Label);
break;
}
}
return $results;
}
public function popEntriesToCurrentFrame(): void
{
while (!$this->isEmpty()) {
if ($this->pop() instanceof StackEntries\Frame) {
break;
}
}
array_pop($this->frames);
}
public function top(): ?StackEntry
{
$n = array_key_last($this->entries);
return $n === null ? null : $this->entries[$n];
}
public function count(): int
{
return count($this->entries);
}
public function isEmpty(): bool
{
return $this->count() === 0;
}
public function currentFrame(): StackEntries\Frame
{
assert(count($this->frames) !== 0);
return $this->frames[count($this->frames) - 1];
}
private function push(StackEntry $entry): void
{
$this->entries[] = $entry;
}
private function pop(): ?StackEntry
{
return array_pop($this->entries);
}
}
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