[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/safepoint-table.h

+// Copyright 2010 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.
+
+#ifndef V8_SAFEPOINT_TABLE_H_
+#define V8_SAFEPOINT_TABLE_H_
+
+#include "v8.h"
+
+#include "macro-assembler.h"
+#include "zone.h"
+#include "zone-inl.h"
+
+namespace v8 {
+namespace internal {
+
+class SafepointTable BASE_EMBEDDED {
+ public:
+  explicit SafepointTable(Code* code);
+
+  int size() const {
+    return kHeaderSize +
+           (length_ * (kPcAndDeoptimizationIndexSize + entry_size_)); }
+  unsigned length() const { return length_; }
+  unsigned entry_size() const { return entry_size_; }
+
+  unsigned GetPcOffset(unsigned index) const {
+    ASSERT(index < length_);
+    return Memory::uint32_at(GetPcOffsetLocation(index));
+  }
+
+  int GetDeoptimizationIndex(unsigned index) const {
+    ASSERT(index < length_);
+    unsigned value = Memory::uint32_at(GetDeoptimizationLocation(index));
+    return DeoptimizationIndexField::decode(value);
+  }
+
+  unsigned GetGapCodeSize(unsigned index) const {
+    ASSERT(index < length_);
+    unsigned value = Memory::uint32_at(GetDeoptimizationLocation(index));
+    return GapCodeSizeField::decode(value);
+  }
+
+  uint8_t* GetEntry(unsigned index) const {
+    ASSERT(index < length_);
+    return &Memory::uint8_at(entries_ + (index * entry_size_));
+  }
+
+  class GapCodeSizeField: public BitField<unsigned, 0, 8> {};
+  class DeoptimizationIndexField: public BitField<int, 8, 24> {};
+
+  static bool HasRegisters(uint8_t* entry);
+  static bool HasRegisterAt(uint8_t* entry, int reg_index);
+
+  void PrintEntry(unsigned index) const;
+
+ private:
+  static const uint8_t kNoRegisters = 0xFF;
+
+  static const int kLengthOffset = 0;
+  static const int kEntrySizeOffset = kLengthOffset + kIntSize;
+  static const int kHeaderSize = kEntrySizeOffset + kIntSize;
+
+  static const int kPcSize = kIntSize;
+  static const int kDeoptimizationIndexSize = kIntSize;
+  static const int kPcAndDeoptimizationIndexSize =
+      kPcSize + kDeoptimizationIndexSize;
+
+  Address GetPcOffsetLocation(unsigned index) const {
+    return pc_and_deoptimization_indexes_ +
+           (index * kPcAndDeoptimizationIndexSize);
+  }
+
+  Address GetDeoptimizationLocation(unsigned index) const {
+    return GetPcOffsetLocation(index) + kPcSize;
+  }
+
+  static void PrintBits(uint8_t byte, int digits);
+
+  AssertNoAllocation no_allocation_;
+  Code* code_;
+  unsigned length_;
+  unsigned entry_size_;
+
+  Address pc_and_deoptimization_indexes_;
+  Address entries_;
+
+  friend class SafepointTableBuilder;
+};
+
+
+class Safepoint BASE_EMBEDDED {
+ public:
+  static const int kNoDeoptimizationIndex = 0x00ffffff;
+
+  void DefinePointerSlot(int index) { indexes_->Add(index); }
+  void DefinePointerRegister(Register reg) { registers_->Add(reg.code()); }
+
+ private:
+  Safepoint(ZoneList<int>* indexes, ZoneList<int>* registers) :
+      indexes_(indexes), registers_(registers) { }
+  ZoneList<int>* indexes_;
+  ZoneList<int>* registers_;
+
+  friend class SafepointTableBuilder;
+};
+
+
+class SafepointTableBuilder BASE_EMBEDDED {
+ public:
+  SafepointTableBuilder()
+      : deoptimization_info_(32),
+        indexes_(32),
+        registers_(32),
+        emitted_(false) { }
+
+  // Get the offset of the emitted safepoint table in the code.
+  unsigned GetCodeOffset() const;
+
+  // Define a new safepoint for the current position in the body.
+  Safepoint DefineSafepoint(
+      Assembler* assembler,
+      int deoptimization_index = Safepoint::kNoDeoptimizationIndex);
+
+  // Define a new safepoint with registers on the stack for the
+  // current position in the body and take the number of arguments on
+  // top of the registers into account.
+  Safepoint DefineSafepointWithRegisters(
+      Assembler* assembler,
+      int arguments,
+      int deoptimization_index = Safepoint::kNoDeoptimizationIndex);
+
+  // Update the last safepoint with the size of the code generated for the gap
+  // following it.
+  void SetPcAfterGap(int pc) {
+    ASSERT(!deoptimization_info_.is_empty());
+    int index = deoptimization_info_.length() - 1;
+    deoptimization_info_[index].pc_after_gap = pc;
+  }
+
+  // Emit the safepoint table after the body. The number of bits per
+  // entry must be enough to hold all the pointer indexes.
+  void Emit(Assembler* assembler, int bits_per_entry);
+
+ private:
+  struct DeoptimizationInfo {
+    unsigned pc;
+    unsigned deoptimization_index;
+    unsigned pc_after_gap;
+  };
+
+  uint32_t EncodeDeoptimizationIndexAndGap(DeoptimizationInfo info);
+
+  ZoneList<DeoptimizationInfo> deoptimization_info_;
+  ZoneList<ZoneList<int>*> indexes_;
+  ZoneList<ZoneList<int>*> registers_;
+
+  bool emitted_;
+  unsigned offset_;
+
+  DISALLOW_COPY_AND_ASSIGN(SafepointTableBuilder);
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_SAFEPOINT_TABLE_H_