text: // Copyright 2009 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 "codegen-inl.h"
  #include "register-allocator-inl.h"
  
  namespace v8 { namespace internal {
  
  // -------------------------------------------------------------------------
  // Result implementation.
  
  void Result::ToRegister() {
    UNIMPLEMENTED();
  }
  
  
  void Result::ToRegister(Register target) {
    UNIMPLEMENTED();
  }
  
  
  // -------------------------------------------------------------------------
  // RegisterAllocator implementation.
  
  RegisterFile RegisterAllocator::Reserved() {
    RegisterFile reserved;
    reserved.Use(sp);
    reserved.Use(fp);
    reserved.Use(cp);
    reserved.Use(pc);
    return reserved;
  }
  
  
  void RegisterAllocator::UnuseReserved(RegisterFile* register_file) {
    register_file->ref_counts_[sp.code()] = 0;
    register_file->ref_counts_[fp.code()] = 0;
    register_file->ref_counts_[cp.code()] = 0;
    register_file->ref_counts_[pc.code()] = 0;
  }
  
  
  bool RegisterAllocator::IsReserved(int reg_code) {
    return (reg_code == sp.code())
        || (reg_code == fp.code())
        || (reg_code == cp.code())
        || (reg_code == pc.code());
  }
  
  
  void RegisterAllocator::Initialize() {
    Reset();
    // The following registers are live on function entry, saved in the
    // frame, and available for allocation during execution.
    Use(r1);  // JS function.
    Use(lr);  // Return address.
  }
  
  
  void RegisterAllocator::Reset() {
    registers_.Reset();
    // The following registers are live on function entry and reserved
    // during execution.
    Use(sp);  // Stack pointer.
    Use(fp);  // Frame pointer (caller's frame pointer on entry).
    Use(cp);  // Context context (callee's context on entry).
    Use(pc);  // Program counter.
  }
  
  
  Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
    UNIMPLEMENTED();
    Result invalid(cgen_);
    return invalid;
  }
  
  
  } }  // namespace v8::internal
  