src/lithium.cc

// Copyright 2011 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 "lithium.h"

namespace v8 {
namespace internal {


void LOperand::PrintTo(StringStream* stream) {
  LUnallocated* unalloc = NULL;
  switch (kind()) {
    case INVALID:
      stream->Add("(0)");
      break;
    case UNALLOCATED:
      unalloc = LUnallocated::cast(this);
      stream->Add("v%d", unalloc->virtual_register());
      switch (unalloc->policy()) {
        case LUnallocated::NONE:
          break;
        case LUnallocated::FIXED_REGISTER: {
          const char* register_name =
              Register::AllocationIndexToString(unalloc->fixed_index());
          stream->Add("(=%s)", register_name);
          break;
        }
        case LUnallocated::FIXED_DOUBLE_REGISTER: {
          const char* double_register_name =
              DoubleRegister::AllocationIndexToString(unalloc->fixed_index());
          stream->Add("(=%s)", double_register_name);
          break;
        }
        case LUnallocated::FIXED_SLOT:
          stream->Add("(=%dS)", unalloc->fixed_index());
          break;
        case LUnallocated::MUST_HAVE_REGISTER:
          stream->Add("(R)");
          break;
        case LUnallocated::WRITABLE_REGISTER:
          stream->Add("(WR)");
          break;
        case LUnallocated::SAME_AS_FIRST_INPUT:
          stream->Add("(1)");
          break;
        case LUnallocated::ANY:
          stream->Add("(-)");
          break;
      }
      break;
    case CONSTANT_OPERAND:
      stream->Add("[constant:%d]", index());
      break;
    case STACK_SLOT:
      stream->Add("[stack:%d]", index());
      break;
    case DOUBLE_STACK_SLOT:
      stream->Add("[double_stack:%d]", index());
      break;
    case REGISTER:
      stream->Add("[%s|R]", Register::AllocationIndexToString(index()));
      break;
    case DOUBLE_REGISTER:
      stream->Add("[%s|R]", DoubleRegister::AllocationIndexToString(index()));
      break;
    case ARGUMENT:
      stream->Add("[arg:%d]", index());
      break;
  }
}

#define DEFINE_OPERAND_CACHE(name, type)                      \
  name* name::cache = NULL;                                   \
  void name::SetUpCache() {                                   \
    if (cache) return;                                        \
    cache = new name[kNumCachedOperands];                     \
    for (int i = 0; i < kNumCachedOperands; i++) {            \
      cache[i].ConvertTo(type, i);                            \
    }                                                         \
  }                                                           \

DEFINE_OPERAND_CACHE(LConstantOperand, CONSTANT_OPERAND)
DEFINE_OPERAND_CACHE(LStackSlot,       STACK_SLOT)
DEFINE_OPERAND_CACHE(LDoubleStackSlot, DOUBLE_STACK_SLOT)
DEFINE_OPERAND_CACHE(LRegister,        REGISTER)
DEFINE_OPERAND_CACHE(LDoubleRegister,  DOUBLE_REGISTER)

#undef DEFINE_OPERAND_CACHE

void LOperand::SetUpCaches() {
  LConstantOperand::SetUpCache();
  LStackSlot::SetUpCache();
  LDoubleStackSlot::SetUpCache();
  LRegister::SetUpCache();
  LDoubleRegister::SetUpCache();
}

bool LParallelMove::IsRedundant() const {
  for (int i = 0; i < move_operands_.length(); ++i) {
    if (!move_operands_[i].IsRedundant()) return false;
  }
  return true;
}


void LParallelMove::PrintDataTo(StringStream* stream) const {
  bool first = true;
  for (int i = 0; i < move_operands_.length(); ++i) {
    if (!move_operands_[i].IsEliminated()) {
      LOperand* source = move_operands_[i].source();
      LOperand* destination = move_operands_[i].destination();
      if (!first) stream->Add(" ");
      first = false;
      if (source->Equals(destination)) {
        destination->PrintTo(stream);
      } else {
        destination->PrintTo(stream);
        stream->Add(" = ");
        source->PrintTo(stream);
      }
      stream->Add(";");
    }
  }
}


void LEnvironment::PrintTo(StringStream* stream) {
  stream->Add("[id=%d|", ast_id());
  stream->Add("[parameters=%d|", parameter_count());
  stream->Add("[arguments_stack_height=%d|", arguments_stack_height());
  for (int i = 0; i < values_.length(); ++i) {
    if (i != 0) stream->Add(";");
    if (values_[i] == NULL) {
      stream->Add("[hole]");
    } else {
      values_[i]->PrintTo(stream);
    }
  }
  stream->Add("]");
}


void LPointerMap::RecordPointer(LOperand* op) {
  // Do not record arguments as pointers.
  if (op->IsStackSlot() && op->index() < 0) return;
  ASSERT(!op->IsDoubleRegister() && !op->IsDoubleStackSlot());
  pointer_operands_.Add(op);
}


void LPointerMap::RemovePointer(LOperand* op) {
  // Do not record arguments as pointers.
  if (op->IsStackSlot() && op->index() < 0) return;
  ASSERT(!op->IsDoubleRegister() && !op->IsDoubleStackSlot());
  for (int i = 0; i < pointer_operands_.length(); ++i) {
    if (pointer_operands_[i]->Equals(op)) {
      pointer_operands_.Remove(i);
      --i;
    }
  }
}


void LPointerMap::RecordUntagged(LOperand* op) {
  // Do not record arguments as pointers.
  if (op->IsStackSlot() && op->index() < 0) return;
  ASSERT(!op->IsDoubleRegister() && !op->IsDoubleStackSlot());
  untagged_operands_.Add(op);
}


void LPointerMap::PrintTo(StringStream* stream) {
  stream->Add("{");
  for (int i = 0; i < pointer_operands_.length(); ++i) {
    if (i != 0) stream->Add(";");
    pointer_operands_[i]->PrintTo(stream);
  }
  stream->Add("} @%d", position());
}


int ElementsKindToShiftSize(ElementsKind elements_kind) {
  switch (elements_kind) {
    case EXTERNAL_BYTE_ELEMENTS:
    case EXTERNAL_PIXEL_ELEMENTS:
    case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
      return 0;
    case EXTERNAL_SHORT_ELEMENTS:
    case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
      return 1;
    case EXTERNAL_INT_ELEMENTS:
    case EXTERNAL_UNSIGNED_INT_ELEMENTS:
    case EXTERNAL_FLOAT_ELEMENTS:
      return 2;
    case EXTERNAL_DOUBLE_ELEMENTS:
    case FAST_DOUBLE_ELEMENTS:
      return 3;
    case FAST_SMI_ONLY_ELEMENTS:
    case FAST_ELEMENTS:
    case DICTIONARY_ELEMENTS:
    case NON_STRICT_ARGUMENTS_ELEMENTS:
      return kPointerSizeLog2;
  }
  UNREACHABLE();
  return 0;
}


} }  // namespace v8::internal