Changeset 163851 in webkit for trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp

Timestamp:

Feb 10, 2014, 6:41:46 PM (12 years ago)

Author:

[email protected]

Message:

FTL should support ToThis
​https://bugs.webkit.org/show_bug.cgi?id=127751

Reviewed by Oliver Hunt.

• ftl/FTLCapabilities.cpp:

(JSC::FTL::canCompile):

• ftl/FTLIntrinsicRepository.h:
• ftl/FTLLowerDFGToLLVM.cpp:

(JSC::FTL::LowerDFGToLLVM::compileNode):
(JSC::FTL::LowerDFGToLLVM::compileToThis):

• tests/stress/to-this-polymorphic.js: Added.

(foo):

File:

• trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp (modified) (2 diffs)

trunk/Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp

@@ -304 +304 @@
             compilePhantom();
             break;
+        case ToThis:
+            compileToThis();
+            break;
         case ValueAdd:
             compileValueAdd();
@@ -888 +891 @@
     {
         DFG_NODE_DO_TO_CHILDREN(m_graph, m_node, speculate);
+    }
+    
+    void compileToThis()
+    {
+        LValue value = lowJSValue(m_node->child1());
+        
+        LBasicBlock isCellCase = FTL_NEW_BLOCK(m_out, ("ToThis is cell case"));
+        LBasicBlock slowCase = FTL_NEW_BLOCK(m_out, ("ToThis slow case"));
+        LBasicBlock continuation = FTL_NEW_BLOCK(m_out, ("ToThis continuation"));
+        
+        m_out.branch(isCell(value), isCellCase, slowCase);
+        
+        LBasicBlock lastNext = m_out.appendTo(isCellCase, slowCase);
+        ValueFromBlock fastResult = m_out.anchor(value);
+        m_out.branch(isType(value, FinalObjectType), continuation, slowCase);
+        
+        m_out.appendTo(slowCase, continuation);
+        J_JITOperation_EJ function;
+        if (m_graph.isStrictModeFor(m_node->codeOrigin))
+            function = operationToThisStrict;
+        else
+            function = operationToThis;
+        ValueFromBlock slowResult = m_out.anchor(
+            vmCall(m_out.operation(function), m_callFrame, value));
+        m_out.jump(continuation);
+        
+        m_out.appendTo(continuation, lastNext);
+        setJSValue(m_out.phi(m_out.int64, fastResult, slowResult));
     }