From 470286ecfe79d59df14944e5b5d34630fc739391 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@digia.com>
Date: Thu, 22 Nov 2012 09:09:45 +0100
Subject: Imported WebKit commit e89504fa9195b2063b2530961d4b73dd08de3242
 (http://svn.webkit.org/repository/webkit/trunk@135485)

Change-Id: I03774e5ac79721c13ffa30d152537a74d0b12e66
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
---
 .../JavaScriptCore/assembler/MacroAssemblerX86.h   | 34 ++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'Source/JavaScriptCore/assembler/MacroAssemblerX86.h')

diff --git a/Source/JavaScriptCore/assembler/MacroAssemblerX86.h b/Source/JavaScriptCore/assembler/MacroAssemblerX86.h
index 8fd31466d..27a030edf 100644
--- a/Source/JavaScriptCore/assembler/MacroAssemblerX86.h
+++ b/Source/JavaScriptCore/assembler/MacroAssemblerX86.h
@@ -253,6 +253,40 @@ public:
         return FunctionPtr(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(call.dataLocation()) + offset));
     }
 
+    static bool canJumpReplacePatchableBranchPtrWithPatch() { return true; }
+    
+    static CodeLocationLabel startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr label)
+    {
+        const int opcodeBytes = 1;
+        const int modRMBytes = 1;
+        const int immediateBytes = 4;
+        const int totalBytes = opcodeBytes + modRMBytes + immediateBytes;
+        ASSERT(totalBytes >= maxJumpReplacementSize());
+        return label.labelAtOffset(-totalBytes);
+    }
+    
+    static CodeLocationLabel startOfPatchableBranchPtrWithPatchOnAddress(CodeLocationDataLabelPtr label)
+    {
+        const int opcodeBytes = 1;
+        const int modRMBytes = 1;
+        const int offsetBytes = 0;
+        const int immediateBytes = 4;
+        const int totalBytes = opcodeBytes + modRMBytes + offsetBytes + immediateBytes;
+        ASSERT(totalBytes >= maxJumpReplacementSize());
+        return label.labelAtOffset(-totalBytes);
+    }
+    
+    static void revertJumpReplacementToBranchPtrWithPatch(CodeLocationLabel instructionStart, RegisterID reg, void* initialValue)
+    {
+        X86Assembler::revertJumpTo_cmpl_ir_force32(instructionStart.executableAddress(), reinterpret_cast<intptr_t>(initialValue), reg);
+    }
+
+    static void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel instructionStart, Address address, void* initialValue)
+    {
+        ASSERT(!address.offset);
+        X86Assembler::revertJumpTo_cmpl_im_force32(instructionStart.executableAddress(), reinterpret_cast<intptr_t>(initialValue), 0, address.base);
+    }
+
 private:
     friend class LinkBuffer;
     friend class RepatchBuffer;
-- 
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