text: // Copyright 2010 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * 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.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "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 THE COPYRIGHT
  // OWNER 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 "v8.h"
  
  #include "frames-inl.h"
  #include "mips/assembler-mips-inl.h"
  
  namespace v8 {
  namespace internal {
  
  
  StackFrame::Type StackFrame::ComputeType(State* state) {
    ASSERT(state->fp != NULL);
    if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
      return ARGUMENTS_ADAPTOR;
    }
    // The marker and function offsets overlap. If the marker isn't a
    // smi then the frame is a JavaScript frame -- and the marker is
    // really the function.
    const int offset = StandardFrameConstants::kMarkerOffset;
    Object* marker = Memory::Object_at(state->fp + offset);
    if (!marker->IsSmi()) return JAVA_SCRIPT;
    return static_cast<StackFrame::Type>(Smi::cast(marker)->value());
  }
  
  
  StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
    if (fp == 0) return NONE;
    // Compute frame type and stack pointer.
    Address sp = fp + ExitFrameConstants::kSPDisplacement;
    const int offset = ExitFrameConstants::kCodeOffset;
    Object* code = Memory::Object_at(fp + offset);
    bool is_debug_exit = code->IsSmi();
    if (is_debug_exit) {
      sp -= kNumJSCallerSaved * kPointerSize;
    }
    // Fill in the state.
    state->sp = sp;
    state->fp = fp;
    state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
    return EXIT;
  }
  
  
  void ExitFrame::Iterate(ObjectVisitor* v) const {
    // Do nothing
  }
  
  
  int JavaScriptFrame::GetProvidedParametersCount() const {
    return ComputeParametersCount();
  }
  
  
  Address JavaScriptFrame::GetCallerStackPointer() const {
    UNIMPLEMENTED_MIPS();
    return static_cast<Address>(NULL);  // UNIMPLEMENTED RETURN
  }
  
  
  Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
    UNIMPLEMENTED_MIPS();
    return static_cast<Address>(NULL);  // UNIMPLEMENTED RETURN
  }
  
  
  Address InternalFrame::GetCallerStackPointer() const {
    UNIMPLEMENTED_MIPS();
    return static_cast<Address>(NULL);  // UNIMPLEMENTED RETURN
  }
  
  
  } }  // namespace v8::internal
  
  