Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 75 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGCapabilities.cpp b/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
new file mode 100644
index 000000000..a8dec067f
--- /dev/null
+++ b/Source/JavaScriptCore/dfg/DFGCapabilities.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "DFGCapabilities.h"
+
+#include "CodeBlock.h"
+#include "Interpreter.h"
+
+namespace JSC { namespace DFG {
+
+#if ENABLE(DFG_JIT)
+
+template<bool (*canHandleOpcode)(OpcodeID)>
+bool canHandleOpcodes(CodeBlock* codeBlock)
+{
+    Interpreter* interpreter = codeBlock->globalData()->interpreter;
+    Instruction* instructionsBegin = codeBlock->instructions().begin();
+    unsigned instructionCount = codeBlock->instructions().size();
+    
+    for (unsigned bytecodeOffset = 0; bytecodeOffset < instructionCount; ) {
+        switch (interpreter->getOpcodeID(instructionsBegin[bytecodeOffset].u.opcode)) {
+#define DEFINE_OP(opcode, length)           \
+        case opcode:                        \
+            if (!canHandleOpcode(opcode))  \
+                return false;               \
+            bytecodeOffset += length;       \
+            break;
+            FOR_EACH_OPCODE_ID(DEFINE_OP)
+#undef DEFINE_OP
+        default:
+            ASSERT_NOT_REACHED();
+            break;
+        }
+    }
+    
+    return true;
+}
+
+bool canCompileOpcodes(CodeBlock* codeBlock)
+{
+    return canHandleOpcodes<canCompileOpcode>(codeBlock);
+}
+
+bool canInlineOpcodes(CodeBlock* codeBlock)
+{
+    return canHandleOpcodes<canInlineOpcode>(codeBlock);
+}
+
+#endif
+
+} } // namespace JSC::DFG
+