From 34db445076b2d51019b3ec981c8a610614d39af3 Mon Sep 17 00:00:00 2001
From: Xuefer <xuefer@gmail.com>
Date: Wed, 8 Jun 2011 03:45:25 +0000
Subject: [PATCH] decode optimized if/return

git-svn-id: svn://svn.lighttpd.net/xcache/trunk@820 c26eb9a1-5813-0410-bd6c-c2e55f420ca7
---
 Decompiler.class.php | 14 ++++++++++++++
 phpdop.phpr          |  7 ++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/Decompiler.class.php b/Decompiler.class.php
index b9e900b..4a441dc 100644
--- a/Decompiler.class.php
+++ b/Decompiler.class.php
@@ -905,6 +905,20 @@ class Decompiler
 			$this->endComplexBlock($EX);
 			return;
 		}
+		if ($firstOp['opcode'] == XC_JMPZ && !empty($firstOp['jmpouts'])
+		 && $firstOp['jmpouts'][0] - 1 == $range[1] && $opcodes[$firstOp['jmpouts'][0] - 1]['opcode'] == XC_RETURN) {
+			$this->beginComplexBlock($EX);
+			$this->removeJmpInfo($EX, $range[0]);
+			$condition = $this->getOpVal($opcodes[$range[0]]['op1'], $EX);
+
+			echo $indent, 'if (', str($condition, $EX), ') ', '{', PHP_EOL;
+			$this->beginScope($EX);
+			$this->recognizeAndDecompileClosedBlocks($EX, $range);
+			$this->endScope($EX);
+			echo $indent, '}', PHP_EOL;
+			$this->endComplexBlock($EX);
+			return;
+		}
 		// }}}
 		// {{{ try/catch
 		if (!empty($firstOp['jmpins']) && !empty($opcodes[$firstOp['jmpins'][0]]['isCatchBegin'])) {
diff --git a/phpdop.phpr b/phpdop.phpr
index 692312c..2f6960c 100755
--- a/phpdop.phpr
+++ b/phpdop.phpr
@@ -94,7 +94,12 @@ if (!isset($argv[1])) {
 	die("Usage: $argv[0] <file>\n");
 }
 $decompiler = new Decompiler();
-$pk = xcache_dasm_file($argv[1]);
+if (isset($argv[2])) {
+	eval('$pk = ' . file_get_contents($argv[2]) . ';');
+}
+else {
+	$pk = xcache_dasm_file($argv[1]);
+}
 $op_array = $funcs = $classes = null;
 if (isset($pk['op_array'])) {
 	$op_array = $pk['op_array'];