Move V8 to external/v8

Change-Id: If68025d67453785a651c5dfb34fad298c16676a4

1 files changed, 722 insertions, 0 deletions

diff --git a/src/assembler.cc b/src/assembler.cc
new file mode 100644
index 00000000..d81b4b05
--- /dev/null
+++ b/src/assembler.cc
@@ -0,0 +1,722 @@
+// Copyright (c) 1994-2006 Sun Microsystems Inc.
+// 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.
+//
+// - Redistribution 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 Sun Microsystems or the names of 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.
+
+// The original source code covered by the above license above has been
+// modified significantly by Google Inc.
+// Copyright 2006-2009 the V8 project authors. All rights reserved.
+
+#include "v8.h"
+
+#include "arguments.h"
+#include "execution.h"
+#include "ic-inl.h"
+#include "factory.h"
+#include "runtime.h"
+#include "serialize.h"
+#include "stub-cache.h"
+#include "regexp-stack.h"
+#include "ast.h"
+#include "regexp-macro-assembler.h"
+// Include native regexp-macro-assembler.
+#ifdef V8_NATIVE_REGEXP
+#if V8_TARGET_ARCH_IA32
+#include "ia32/regexp-macro-assembler-ia32.h"
+#elif V8_TARGET_ARCH_X64
+#include "x64/regexp-macro-assembler-x64.h"
+#elif V8_TARGET_ARCH_ARM
+#include "arm/regexp-macro-assembler-arm.h"
+#else  // Unknown architecture.
+#error "Unknown architecture."
+#endif  // Target architecture.
+#endif  // V8_NATIVE_REGEXP
+
+namespace v8 {
+namespace internal {
+
+
+// -----------------------------------------------------------------------------
+// Implementation of Label
+
+int Label::pos() const {
+  if (pos_ < 0) return -pos_ - 1;
+  if (pos_ > 0) return  pos_ - 1;
+  UNREACHABLE();
+  return 0;
+}
+
+
+// -----------------------------------------------------------------------------
+// Implementation of RelocInfoWriter and RelocIterator
+//
+// Encoding
+//
+// The most common modes are given single-byte encodings.  Also, it is
+// easy to identify the type of reloc info and skip unwanted modes in
+// an iteration.
+//
+// The encoding relies on the fact that there are less than 14
+// different relocation modes.
+//
+// embedded_object:    [6 bits pc delta] 00
+//
+// code_taget:         [6 bits pc delta] 01
+//
+// position:           [6 bits pc delta] 10,
+//                     [7 bits signed data delta] 0
+//
+// statement_position: [6 bits pc delta] 10,
+//                     [7 bits signed data delta] 1
+//
+// any nondata mode:   00 [4 bits rmode] 11,  // rmode: 0..13 only
+//                     00 [6 bits pc delta]
+//
+// pc-jump:            00 1111 11,
+//                     00 [6 bits pc delta]
+//
+// pc-jump:            01 1111 11,
+// (variable length)   7 - 26 bit pc delta, written in chunks of 7
+//                     bits, the lowest 7 bits written first.
+//
+// data-jump + pos:    00 1110 11,
+//                     signed intptr_t, lowest byte written first
+//
+// data-jump + st.pos: 01 1110 11,
+//                     signed intptr_t, lowest byte written first
+//
+// data-jump + comm.:  10 1110 11,
+//                     signed intptr_t, lowest byte written first
+//
+const int kMaxRelocModes = 14;
+
+const int kTagBits = 2;
+const int kTagMask = (1 << kTagBits) - 1;
+const int kExtraTagBits = 4;
+const int kPositionTypeTagBits = 1;
+const int kSmallDataBits = kBitsPerByte - kPositionTypeTagBits;
+
+const int kEmbeddedObjectTag = 0;
+const int kCodeTargetTag = 1;
+const int kPositionTag = 2;
+const int kDefaultTag = 3;
+
+const int kPCJumpTag = (1 << kExtraTagBits) - 1;
+
+const int kSmallPCDeltaBits = kBitsPerByte - kTagBits;
+const int kSmallPCDeltaMask = (1 << kSmallPCDeltaBits) - 1;
+
+const int kVariableLengthPCJumpTopTag = 1;
+const int kChunkBits = 7;
+const int kChunkMask = (1 << kChunkBits) - 1;
+const int kLastChunkTagBits = 1;
+const int kLastChunkTagMask = 1;
+const int kLastChunkTag = 1;
+
+
+const int kDataJumpTag = kPCJumpTag - 1;
+
+const int kNonstatementPositionTag = 0;
+const int kStatementPositionTag = 1;
+const int kCommentTag = 2;
+
+
+uint32_t RelocInfoWriter::WriteVariableLengthPCJump(uint32_t pc_delta) {
+  // Return if the pc_delta can fit in kSmallPCDeltaBits bits.
+  // Otherwise write a variable length PC jump for the bits that do
+  // not fit in the kSmallPCDeltaBits bits.
+  if (is_uintn(pc_delta, kSmallPCDeltaBits)) return pc_delta;
+  WriteExtraTag(kPCJumpTag, kVariableLengthPCJumpTopTag);
+  uint32_t pc_jump = pc_delta >> kSmallPCDeltaBits;
+  ASSERT(pc_jump > 0);
+  // Write kChunkBits size chunks of the pc_jump.
+  for (; pc_jump > 0; pc_jump = pc_jump >> kChunkBits) {
+    byte b = pc_jump & kChunkMask;
+    *--pos_ = b << kLastChunkTagBits;
+  }
+  // Tag the last chunk so it can be identified.
+  *pos_ = *pos_ | kLastChunkTag;
+  // Return the remaining kSmallPCDeltaBits of the pc_delta.
+  return pc_delta & kSmallPCDeltaMask;
+}
+
+
+void RelocInfoWriter::WriteTaggedPC(uint32_t pc_delta, int tag) {
+  // Write a byte of tagged pc-delta, possibly preceded by var. length pc-jump.
+  pc_delta = WriteVariableLengthPCJump(pc_delta);
+  *--pos_ = pc_delta << kTagBits | tag;
+}
+
+
+void RelocInfoWriter::WriteTaggedData(intptr_t data_delta, int tag) {
+  *--pos_ = data_delta << kPositionTypeTagBits | tag;
+}
+
+
+void RelocInfoWriter::WriteExtraTag(int extra_tag, int top_tag) {
+  *--pos_ = top_tag << (kTagBits + kExtraTagBits) |
+            extra_tag << kTagBits |
+            kDefaultTag;
+}
+
+
+void RelocInfoWriter::WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag) {
+  // Write two-byte tagged pc-delta, possibly preceded by var. length pc-jump.
+  pc_delta = WriteVariableLengthPCJump(pc_delta);
+  WriteExtraTag(extra_tag, 0);
+  *--pos_ = pc_delta;
+}
+
+
+void RelocInfoWriter::WriteExtraTaggedData(intptr_t data_delta, int top_tag) {
+  WriteExtraTag(kDataJumpTag, top_tag);
+  for (int i = 0; i < kIntptrSize; i++) {
+    *--pos_ = data_delta;
+  // Signed right shift is arithmetic shift.  Tested in test-utils.cc.
+    data_delta = data_delta >> kBitsPerByte;
+  }
+}
+
+
+void RelocInfoWriter::Write(const RelocInfo* rinfo) {
+#ifdef DEBUG
+  byte* begin_pos = pos_;
+#endif
+  Counters::reloc_info_count.Increment();
+  ASSERT(rinfo->pc() - last_pc_ >= 0);
+  ASSERT(RelocInfo::NUMBER_OF_MODES < kMaxRelocModes);
+  // Use unsigned delta-encoding for pc.
+  uint32_t pc_delta = rinfo->pc() - last_pc_;
+  RelocInfo::Mode rmode = rinfo->rmode();
+
+  // The two most common modes are given small tags, and usually fit in a byte.
+  if (rmode == RelocInfo::EMBEDDED_OBJECT) {
+    WriteTaggedPC(pc_delta, kEmbeddedObjectTag);
+  } else if (rmode == RelocInfo::CODE_TARGET) {
+    WriteTaggedPC(pc_delta, kCodeTargetTag);
+  } else if (RelocInfo::IsPosition(rmode)) {
+    // Use signed delta-encoding for data.
+    intptr_t data_delta = rinfo->data() - last_data_;
+    int pos_type_tag = rmode == RelocInfo::POSITION ? kNonstatementPositionTag
+                                                    : kStatementPositionTag;
+    // Check if data is small enough to fit in a tagged byte.
+    // We cannot use is_intn because data_delta is not an int32_t.
+    if (data_delta >= -(1 << (kSmallDataBits-1)) &&
+        data_delta < 1 << (kSmallDataBits-1)) {
+      WriteTaggedPC(pc_delta, kPositionTag);
+      WriteTaggedData(data_delta, pos_type_tag);
+      last_data_ = rinfo->data();
+    } else {
+      // Otherwise, use costly encoding.
+      WriteExtraTaggedPC(pc_delta, kPCJumpTag);
+      WriteExtraTaggedData(data_delta, pos_type_tag);
+      last_data_ = rinfo->data();
+    }
+  } else if (RelocInfo::IsComment(rmode)) {
+    // Comments are normally not generated, so we use the costly encoding.
+    WriteExtraTaggedPC(pc_delta, kPCJumpTag);
+    WriteExtraTaggedData(rinfo->data() - last_data_, kCommentTag);
+    last_data_ = rinfo->data();
+  } else {
+    // For all other modes we simply use the mode as the extra tag.
+    // None of these modes need a data component.
+    ASSERT(rmode < kPCJumpTag && rmode < kDataJumpTag);
+    WriteExtraTaggedPC(pc_delta, rmode);
+  }
+  last_pc_ = rinfo->pc();
+#ifdef DEBUG
+  ASSERT(begin_pos - pos_ <= kMaxSize);
+#endif
+}
+
+
+inline int RelocIterator::AdvanceGetTag() {
+  return *--pos_ & kTagMask;
+}
+
+
+inline int RelocIterator::GetExtraTag() {
+  return (*pos_ >> kTagBits) & ((1 << kExtraTagBits) - 1);
+}
+
+
+inline int RelocIterator::GetTopTag() {
+  return *pos_ >> (kTagBits + kExtraTagBits);
+}
+
+
+inline void RelocIterator::ReadTaggedPC() {
+  rinfo_.pc_ += *pos_ >> kTagBits;
+}
+
+
+inline void RelocIterator::AdvanceReadPC() {
+  rinfo_.pc_ += *--pos_;
+}
+
+
+void RelocIterator::AdvanceReadData() {
+  intptr_t x = 0;
+  for (int i = 0; i < kIntptrSize; i++) {
+    x |= static_cast<intptr_t>(*--pos_) << i * kBitsPerByte;
+  }
+  rinfo_.data_ += x;
+}
+
+
+void RelocIterator::AdvanceReadVariableLengthPCJump() {
+  // Read the 32-kSmallPCDeltaBits most significant bits of the
+  // pc jump in kChunkBits bit chunks and shift them into place.
+  // Stop when the last chunk is encountered.
+  uint32_t pc_jump = 0;
+  for (int i = 0; i < kIntSize; i++) {
+    byte pc_jump_part = *--pos_;
+    pc_jump |= (pc_jump_part >> kLastChunkTagBits) << i * kChunkBits;
+    if ((pc_jump_part & kLastChunkTagMask) == 1) break;
+  }
+  // The least significant kSmallPCDeltaBits bits will be added
+  // later.
+  rinfo_.pc_ += pc_jump << kSmallPCDeltaBits;
+}
+
+
+inline int RelocIterator::GetPositionTypeTag() {
+  return *pos_ & ((1 << kPositionTypeTagBits) - 1);
+}
+
+
+inline void RelocIterator::ReadTaggedData() {
+  int8_t signed_b = *pos_;
+  // Signed right shift is arithmetic shift.  Tested in test-utils.cc.
+  rinfo_.data_ += signed_b >> kPositionTypeTagBits;
+}
+
+
+inline RelocInfo::Mode RelocIterator::DebugInfoModeFromTag(int tag) {
+  if (tag == kStatementPositionTag) {
+    return RelocInfo::STATEMENT_POSITION;
+  } else if (tag == kNonstatementPositionTag) {
+    return RelocInfo::POSITION;
+  } else {
+    ASSERT(tag == kCommentTag);
+    return RelocInfo::COMMENT;
+  }
+}
+
+
+void RelocIterator::next() {
+  ASSERT(!done());
+  // Basically, do the opposite of RelocInfoWriter::Write.
+  // Reading of data is as far as possible avoided for unwanted modes,
+  // but we must always update the pc.
+  //
+  // We exit this loop by returning when we find a mode we want.
+  while (pos_ > end_) {
+    int tag = AdvanceGetTag();
+    if (tag == kEmbeddedObjectTag) {
+      ReadTaggedPC();
+      if (SetMode(RelocInfo::EMBEDDED_OBJECT)) return;
+    } else if (tag == kCodeTargetTag) {
+      ReadTaggedPC();
+      if (*(reinterpret_cast<int*>(rinfo_.pc())) == 0x61) {
+        tag = 0;
+      }
+      if (SetMode(RelocInfo::CODE_TARGET)) return;
+    } else if (tag == kPositionTag) {
+      ReadTaggedPC();
+      Advance();
+      // Check if we want source positions.
+      if (mode_mask_ & RelocInfo::kPositionMask) {
+        // Check if we want this type of source position.
+        if (SetMode(DebugInfoModeFromTag(GetPositionTypeTag()))) {
+          // Finally read the data before returning.
+          ReadTaggedData();
+          return;
+        }
+      }
+    } else {
+      ASSERT(tag == kDefaultTag);
+      int extra_tag = GetExtraTag();
+      if (extra_tag == kPCJumpTag) {
+        int top_tag = GetTopTag();
+        if (top_tag == kVariableLengthPCJumpTopTag) {
+          AdvanceReadVariableLengthPCJump();
+        } else {
+          AdvanceReadPC();
+        }
+      } else if (extra_tag == kDataJumpTag) {
+        // Check if we want debug modes (the only ones with data).
+        if (mode_mask_ & RelocInfo::kDebugMask) {
+          int top_tag = GetTopTag();
+          AdvanceReadData();
+          if (SetMode(DebugInfoModeFromTag(top_tag))) return;
+        } else {
+          // Otherwise, just skip over the data.
+          Advance(kIntptrSize);
+        }
+      } else {
+        AdvanceReadPC();
+        if (SetMode(static_cast<RelocInfo::Mode>(extra_tag))) return;
+      }
+    }
+  }
+  done_ = true;
+}
+
+
+RelocIterator::RelocIterator(Code* code, int mode_mask) {
+  rinfo_.pc_ = code->instruction_start();
+  rinfo_.data_ = 0;
+  // relocation info is read backwards
+  pos_ = code->relocation_start() + code->relocation_size();
+  end_ = code->relocation_start();
+  done_ = false;
+  mode_mask_ = mode_mask;
+  if (mode_mask_ == 0) pos_ = end_;
+  next();
+}
+
+
+RelocIterator::RelocIterator(const CodeDesc& desc, int mode_mask) {
+  rinfo_.pc_ = desc.buffer;
+  rinfo_.data_ = 0;
+  // relocation info is read backwards
+  pos_ = desc.buffer + desc.buffer_size;
+  end_ = pos_ - desc.reloc_size;
+  done_ = false;
+  mode_mask_ = mode_mask;
+  if (mode_mask_ == 0) pos_ = end_;
+  next();
+}
+
+
+// -----------------------------------------------------------------------------
+// Implementation of RelocInfo
+
+
+#ifdef ENABLE_DISASSEMBLER
+const char* RelocInfo::RelocModeName(RelocInfo::Mode rmode) {
+  switch (rmode) {
+    case RelocInfo::NONE:
+      return "no reloc";
+    case RelocInfo::EMBEDDED_OBJECT:
+      return "embedded object";
+    case RelocInfo::EMBEDDED_STRING:
+      return "embedded string";
+    case RelocInfo::CONSTRUCT_CALL:
+      return "code target (js construct call)";
+    case RelocInfo::CODE_TARGET_CONTEXT:
+      return "code target (context)";
+    case RelocInfo::CODE_TARGET:
+      return "code target";
+    case RelocInfo::RUNTIME_ENTRY:
+      return "runtime entry";
+    case RelocInfo::JS_RETURN:
+      return "js return";
+    case RelocInfo::COMMENT:
+      return "comment";
+    case RelocInfo::POSITION:
+      return "position";
+    case RelocInfo::STATEMENT_POSITION:
+      return "statement position";
+    case RelocInfo::EXTERNAL_REFERENCE:
+      return "external reference";
+    case RelocInfo::INTERNAL_REFERENCE:
+      return "internal reference";
+    case RelocInfo::NUMBER_OF_MODES:
+      UNREACHABLE();
+      return "number_of_modes";
+  }
+  return "unknown relocation type";
+}
+
+
+void RelocInfo::Print() {
+  PrintF("%p  %s", pc_, RelocModeName(rmode_));
+  if (IsComment(rmode_)) {
+    PrintF("  (%s)", data_);
+  } else if (rmode_ == EMBEDDED_OBJECT) {
+    PrintF("  (");
+    target_object()->ShortPrint();
+    PrintF(")");
+  } else if (rmode_ == EXTERNAL_REFERENCE) {
+    ExternalReferenceEncoder ref_encoder;
+    PrintF(" (%s)  (%p)",
+           ref_encoder.NameOfAddress(*target_reference_address()),
+           *target_reference_address());
+  } else if (IsCodeTarget(rmode_)) {
+    Code* code = Code::GetCodeFromTargetAddress(target_address());
+    PrintF(" (%s)  (%p)", Code::Kind2String(code->kind()), target_address());
+  } else if (IsPosition(rmode_)) {
+    PrintF("  (%d)", data());
+  }
+
+  PrintF("\n");
+}
+#endif  // ENABLE_DISASSEMBLER
+
+
+#ifdef DEBUG
+void RelocInfo::Verify() {
+  switch (rmode_) {
+    case EMBEDDED_OBJECT:
+      Object::VerifyPointer(target_object());
+      break;
+    case CONSTRUCT_CALL:
+    case CODE_TARGET_CONTEXT:
+    case CODE_TARGET: {
+      // convert inline target address to code object
+      Address addr = target_address();
+      ASSERT(addr != NULL);
+      // Check that we can find the right code object.
+      Code* code = Code::GetCodeFromTargetAddress(addr);
+      Object* found = Heap::FindCodeObject(addr);
+      ASSERT(found->IsCode());
+      ASSERT(code->address() == HeapObject::cast(found)->address());
+      break;
+    }
+    case RelocInfo::EMBEDDED_STRING:
+    case RUNTIME_ENTRY:
+    case JS_RETURN:
+    case COMMENT:
+    case POSITION:
+    case STATEMENT_POSITION:
+    case EXTERNAL_REFERENCE:
+    case INTERNAL_REFERENCE:
+    case NONE:
+      break;
+    case NUMBER_OF_MODES:
+      UNREACHABLE();
+      break;
+  }
+}
+#endif  // DEBUG
+
+
+// -----------------------------------------------------------------------------
+// Implementation of ExternalReference
+
+ExternalReference::ExternalReference(Builtins::CFunctionId id)
+  : address_(Redirect(Builtins::c_function_address(id))) {}
+
+
+ExternalReference::ExternalReference(Builtins::Name name)
+  : address_(Builtins::builtin_address(name)) {}
+
+
+ExternalReference::ExternalReference(Runtime::FunctionId id)
+  : address_(Redirect(Runtime::FunctionForId(id)->entry)) {}
+
+
+ExternalReference::ExternalReference(Runtime::Function* f)
+  : address_(Redirect(f->entry)) {}
+
+
+ExternalReference::ExternalReference(const IC_Utility& ic_utility)
+  : address_(Redirect(ic_utility.address())) {}
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ExternalReference::ExternalReference(const Debug_Address& debug_address)
+  : address_(debug_address.address()) {}
+#endif
+
+ExternalReference::ExternalReference(StatsCounter* counter)
+  : address_(reinterpret_cast<Address>(counter->GetInternalPointer())) {}
+
+
+ExternalReference::ExternalReference(Top::AddressId id)
+  : address_(Top::get_address_from_id(id)) {}
+
+
+ExternalReference::ExternalReference(const SCTableReference& table_ref)
+  : address_(table_ref.address()) {}
+
+
+ExternalReference ExternalReference::perform_gc_function() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(Runtime::PerformGC)));
+}
+
+
+ExternalReference ExternalReference::builtin_passed_function() {
+  return ExternalReference(&Builtins::builtin_passed_function);
+}
+
+
+ExternalReference ExternalReference::random_positive_smi_function() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(V8::RandomPositiveSmi)));
+}
+
+
+ExternalReference ExternalReference::the_hole_value_location() {
+  return ExternalReference(Factory::the_hole_value().location());
+}
+
+
+ExternalReference ExternalReference::roots_address() {
+  return ExternalReference(Heap::roots_address());
+}
+
+
+ExternalReference ExternalReference::address_of_stack_guard_limit() {
+  return ExternalReference(StackGuard::address_of_jslimit());
+}
+
+
+ExternalReference ExternalReference::address_of_regexp_stack_limit() {
+  return ExternalReference(RegExpStack::limit_address());
+}
+
+
+ExternalReference ExternalReference::new_space_start() {
+  return ExternalReference(Heap::NewSpaceStart());
+}
+
+
+ExternalReference ExternalReference::new_space_allocation_top_address() {
+  return ExternalReference(Heap::NewSpaceAllocationTopAddress());
+}
+
+
+ExternalReference ExternalReference::heap_always_allocate_scope_depth() {
+  return ExternalReference(Heap::always_allocate_scope_depth_address());
+}
+
+
+ExternalReference ExternalReference::new_space_allocation_limit_address() {
+  return ExternalReference(Heap::NewSpaceAllocationLimitAddress());
+}
+
+#ifdef V8_NATIVE_REGEXP
+
+ExternalReference ExternalReference::re_check_stack_guard_state() {
+  Address function;
+#ifdef V8_TARGET_ARCH_X64
+  function = FUNCTION_ADDR(RegExpMacroAssemblerX64::CheckStackGuardState);
+#elif V8_TARGET_ARCH_IA32
+  function = FUNCTION_ADDR(RegExpMacroAssemblerIA32::CheckStackGuardState);
+#elif V8_TARGET_ARCH_ARM
+  function = FUNCTION_ADDR(RegExpMacroAssemblerARM::CheckStackGuardState);
+#else
+  UNREACHABLE("Unexpected architecture");
+#endif
+  return ExternalReference(Redirect(function));
+}
+
+ExternalReference ExternalReference::re_grow_stack() {
+  return ExternalReference(
+      Redirect(FUNCTION_ADDR(NativeRegExpMacroAssembler::GrowStack)));
+}
+
+ExternalReference ExternalReference::re_case_insensitive_compare_uc16() {
+  return ExternalReference(Redirect(
+      FUNCTION_ADDR(NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16)));
+}
+
+#endif
+
+
+static double add_two_doubles(double x, double y) {
+  return x + y;
+}
+
+
+static double sub_two_doubles(double x, double y) {
+  return x - y;
+}
+
+
+static double mul_two_doubles(double x, double y) {
+  return x * y;
+}
+
+
+static double div_two_doubles(double x, double y) {
+  return x / y;
+}
+
+
+static double mod_two_doubles(double x, double y) {
+  return fmod(x, y);
+}
+
+
+static int native_compare_doubles(double x, double y) {
+  if (x == y) return 0;
+  return x < y ? 1 : -1;
+}
+
+
+ExternalReference ExternalReference::double_fp_operation(
+    Token::Value operation) {
+  typedef double BinaryFPOperation(double x, double y);
+  BinaryFPOperation* function = NULL;
+  switch (operation) {
+    case Token::ADD:
+      function = &add_two_doubles;
+      break;
+    case Token::SUB:
+      function = &sub_two_doubles;
+      break;
+    case Token::MUL:
+      function = &mul_two_doubles;
+      break;
+    case Token::DIV:
+      function = &div_two_doubles;
+      break;
+    case Token::MOD:
+      function = &mod_two_doubles;
+      break;
+    default:
+      UNREACHABLE();
+  }
+  // Passing true as 2nd parameter indicates that they return an fp value.
+  return ExternalReference(Redirect(FUNCTION_ADDR(function), true));
+}
+
+
+ExternalReference ExternalReference::compare_doubles() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(native_compare_doubles),
+                                    false));
+}
+
+
+ExternalReferenceRedirector* ExternalReference::redirector_ = NULL;
+
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ExternalReference ExternalReference::debug_break() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(Debug::Break)));
+}
+
+
+ExternalReference ExternalReference::debug_step_in_fp_address() {
+  return ExternalReference(Debug::step_in_fp_addr());
+}
+#endif
+
+} }  // namespace v8::internal