src/frames-arm.cc

// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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#include "v8.h"

#include "frames-inl.h"
#include "assembler-arm-inl.h"


namespace v8 { namespace internal {


StackFrame::Type StackFrame::ComputeType(State* state) {
  ASSERT(state->fp != NULL);
  if (state->pp == NULL) {
    if (Memory::Address_at(state->fp +
                           EntryFrameConstants::kConstructMarkOffset) != 0) {
      return ENTRY_CONSTRUCT;
    } else {
      return ENTRY;
    }
  } else if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
    return ARGUMENTS_ADAPTOR;
  } else if (
      Memory::Object_at(state->fp +
                        StandardFrameConstants::kFunctionOffset)->IsSmi()) {
    return INTERNAL;
  } else {
    return JAVA_SCRIPT;
  }
}


StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
  if (fp == 0) return NONE;
  // Compute frame type and stack pointer.
  Address sp = fp + ExitFrameConstants::kSPDisplacement;
  Type type;
  if (Memory::Address_at(fp + ExitFrameConstants::kDebugMarkOffset) != 0) {
    type = EXIT_DEBUG;
    sp -= kNumJSCallerSaved * kPointerSize;
  } else {
    type = EXIT;
  }
  // Fill in the state.
  state->sp = sp;
  state->fp = fp;
  state->pp = fp + ExitFrameConstants::kPPDisplacement;
  state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
  return type;
}


void ExitFrame::Iterate(ObjectVisitor* v) const {
  // Do nothing
}


int JavaScriptFrame::GetProvidedParametersCount() const {
  const int offset = JavaScriptFrameConstants::kArgsLengthOffset;
  int result = Memory::int_at(fp() + offset);
  // We never remove extra parameters provided on the stack; we only
  // fill in undefined values for parameters not provided.
  ASSERT(0 <= result && result <= ComputeParametersCount());
  return result;
}


Address JavaScriptFrame::GetCallerStackPointer() const {
  return state_.pp;
}


Address ArgumentsAdaptorFrame::GetCallerStackPointer() const {
  // Argument adaptor frames aren't used on ARM (yet).
  UNIMPLEMENTED();
  return 0;
}


Address InternalFrame::GetCallerStackPointer() const {
  return state_.pp;
}


Code* JavaScriptFrame::FindCode() const {
  const int offset = StandardFrameConstants::kCodeOffset;
  Object* code = Memory::Object_at(fp() + offset);
  if (code == NULL) {
    // The code object isn't set; find it and set it.
    code = Heap::FindCodeObject(pc());
    ASSERT(!code->IsFailure());
    Memory::Object_at(fp() + offset) = code;
  }
  ASSERT(code != NULL);
  return Code::cast(code);
}


} }  // namespace v8::internal