dfg/DFGCallCreateDirectArgumentsSlowPathGenerator.h

   1 /*
   2  * Copyright (C) 2015 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef DFGCallCreateDirectArgumentsSlowPathGenerator_h
  27 #define DFGCallCreateDirectArgumentsSlowPathGenerator_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "DFGCommon.h"
  32 #include "DFGOperations.h"
  33 #include "DFGSlowPathGenerator.h"
  34 #include "DFGSpeculativeJIT.h"
  35 #include "DirectArguments.h"
  36
  37 namespace JSC { namespace DFG {
  38
  39 // This calls operationCreateDirectArguments but then restores the value of lengthGPR.
  40 class CallCreateDirectArgumentsSlowPathGenerator : public JumpingSlowPathGenerator<MacroAssembler::JumpList> {
  41 public:
  42     CallCreateDirectArgumentsSlowPathGenerator(
  43         MacroAssembler::JumpList from, SpeculativeJIT* jit, GPRReg resultGPR, Structure* structure,
  44         GPRReg lengthGPR, unsigned minCapacity)
  45         : JumpingSlowPathGenerator<MacroAssembler::JumpList>(from, jit)
  46         , m_resultGPR(resultGPR)
  47         , m_structure(structure)
  48         , m_lengthGPR(lengthGPR)
  49         , m_minCapacity(minCapacity)
  50     {
  51         jit->silentSpillAllRegistersImpl(false, m_plans, resultGPR);
  52     }
  53
  54 protected:
  55     void generateInternal(SpeculativeJIT* jit) override
  56     {
  57         linkFrom(jit);
  58         for (unsigned i = 0; i < m_plans.size(); ++i)
  59             jit->silentSpill(m_plans[i]);
  60         jit->callOperation(
  61             operationCreateDirectArguments, m_resultGPR, m_structure, m_lengthGPR, m_minCapacity);
  62         GPRReg canTrample = SpeculativeJIT::pickCanTrample(m_resultGPR);
  63         for (unsigned i = m_plans.size(); i--;)
  64             jit->silentFill(m_plans[i], canTrample);
  65         jit->m_jit.loadPtr(
  66             MacroAssembler::Address(m_resultGPR, DirectArguments::offsetOfLength()), m_lengthGPR);
  67         jumpTo(jit);
  68     }
  69
  70 private:
  71     GPRReg m_resultGPR;
  72     Structure* m_structure;
  73     GPRReg m_lengthGPR;
  74     unsigned m_minCapacity;
  75     Vector<SilentRegisterSavePlan, 2> m_plans;
  76 };
  77
  78 } } // namespace JSC::DFG
  79
  80 #endif // ENABLE(DFG_JIT)
  81
  82 #endif // DFGCallCreateDirectArgumentsSlowPathGenerator_h
  83