Changeset 810 for trunk/Decompiler.class.php

Timestamp:

04/27/2011 09:19:24 AM (2 years ago)

Author:

moo

Message:

Decompiler: if/elseif/else

Files:

• trunk/Decompiler.class.php (modified) (2 diffs)

trunk/Decompiler.class.php

@@ -709 +709 @@
     }
     // }}}
+    function isIfCondition(&$EX, $range) // {{{
+    {
+        $opcodes = &$EX['opcodes'];
+        $firstOp = &$opcodes[$range[0]];
+        return $firstOp['opcode'] == XC_JMPZ && !empty($firstOp['jmpouts']) && $opcodes[$firstOp['jmpouts'][0] - 1]['opcode'] == XC_JMP
+         && !empty($opcodes[$firstOp['jmpouts'][0] - 1]['jmpouts'])
+         && $opcodes[$firstOp['jmpouts'][0] - 1]['jmpouts'][0] == $range[1] + 1;
+    }
+    // }}}
     function removeJmpInfo(&$EX, $line) // {{{
     {
@@ -828 +837 @@
             $this->recognizeAndDecompileClosedBlocks($EX, $bodyRange, $indent . INDENT);
             echo $indent, '}', PHP_EOL;
+            $this->endComplexBlock($EX);
+            return;
+        }
+        // }}}
+        // {{{ if/elseif/else
+        if ($this->isIfCondition($EX, $range)) {
+            $this->beginComplexBlock($EX);
+            $isElseIf = false;
+            do {
+                $ifRange = array($range[0], $opcodes[$range[0]]['jmpouts'][0] - 1);
+                $this->removeJmpInfo($EX, $ifRange[0]);
+                $this->removeJmpInfo($EX, $ifRange[1]);
+                $condition = $this->getOpVal($opcodes[$ifRange[0]]['op1'], $EX);
+
+                echo $indent, $isElseIf ? 'else if' : 'if', ' (', str($condition, $EX), ') ', '{', PHP_EOL;
+                $this->recognizeAndDecompileClosedBlocks($EX, $ifRange, $indent . INDENT);
+                $EX['lastBlock'] = null;
+                echo $indent, '}', PHP_EOL;
+
+                $isElseIf = true;
+                // search for else if
+                $range[0] = $ifRange[1] + 1;
+                for ($i = $ifRange[1] + 1; $i <= $range[1]; ++$i) {
+                    // find first jmpout
+                    if (!empty($opcodes[$i]['jmpouts'])) {
+                        if ($this->isIfCondition($EX, array($i, $range[1]))) {
+                            $this->dasmBasicBlock($EX, array($range[0], $i));
+                            $range[0] = $i;
+                        }
+                        break;
+                    }
+                }
+            } while ($this->isIfCondition($EX, $range));
+            if ($ifRange[1] < $range[1]) {
+                $elseRange = array($ifRange[1], $range[1]);
+                echo $indent, 'else ', '{', PHP_EOL;
+                $this->recognizeAndDecompileClosedBlocks($EX, $elseRange, $indent . INDENT);
+                $EX['lastBlock'] = null;
+                echo $indent, '}', PHP_EOL;
+            }
             $this->endComplexBlock($EX);
             return;