add implementations of addrx and constx for DWARF expressions

Author: sj-i

src/Lib/Dwarf/Expression/Opcodes/LiteralEncodings/AddrConstX.php

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\Dwarf\Expression\Opcodes\LiteralEncodings;
+
+use PhpProfiler\Lib\Dwarf\Expression\ExpressionContext;
+use PhpProfiler\Lib\Dwarf\Expression\Opcodes\Opcode;
+use PhpProfiler\Lib\Dwarf\Expression\Stack;
+
+final class AddrConstX implements Opcode
+{
+    public function __construct(
+        private ExpressionContext $expression_context,
+    ) {
+    }
+
+    public function execute(Stack $stack, ...$operands): int
+    {
+        $unit_die = $this->expression_context->getCompilationUnit()->unit_die;
+        $address_table = $this->expression_context->getExecutableFile()->debug_addr->address_table;
+        $address_base = $unit_die->getAddressBase();
+        $address = $operands[0] * $address_table->address_table_header->address_size + $address_base;
+        $index = $address / $address_table->address_table_header->address_size;
+
+        $stack->push($address_table->addresses[$index]);
+        return 1;
+    }
+}

src/Lib/Dwarf/Expression/Operation.php

@@ -221,6 +221,8 @@ public function getOpcode(ExpressionContext $expression_context): Opcode
             self::DW_OP_const8s, self::DW_OP_const8u,
             self::DW_OP_consts, self::DW_OP_constu
                 => new Constant(),
+            self::DW_OP_constx, self::DW_OP_addrx
+                => new AddrConstX($expression_context),
         };
     }