// Copyright 2010 the V8 project authors. All rights reserved.
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// 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
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//       with the distribution.
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//
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// 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 {
  return fp() + StandardFrameConstants::kCallerSPOffset;
}


} }  // namespace v8::internal