Fix lazy deoptimization at HInvokeFunction and enable target-recording call-function stub.

src/safepoint-table.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
@@ skipping 104 matching lines @@
   }
 }
 
 
 void Safepoint::DefinePointerRegister(Register reg) {
   registers_->Add(reg.code());
 }
 
 
 Safepoint SafepointTableBuilder::DefineSafepoint(
-    Assembler* assembler, Safepoint::Kind kind, int arguments,
-    int deoptimization_index) {
-  ASSERT(deoptimization_index != -1);
+    Assembler* assembler,
+    Safepoint::Kind kind,
+    int arguments,
+    Safepoint::DeoptMode deopt_mode) {
   ASSERT(arguments >= 0);
-  DeoptimizationInfo pc_and_deoptimization_index;
-  pc_and_deoptimization_index.pc = assembler->pc_offset();
-  pc_and_deoptimization_index.deoptimization_index = deoptimization_index;
-  pc_and_deoptimization_index.pc_after_gap = assembler->pc_offset();
-  pc_and_deoptimization_index.arguments = arguments;
-  pc_and_deoptimization_index.has_doubles = (kind & Safepoint::kWithDoubles);
-  deoptimization_info_.Add(pc_and_deoptimization_index);
+  DeoptimizationInfo info;
+  info.pc = assembler->pc_offset();
+  info.arguments = arguments;
+  info.has_doubles = (kind & Safepoint::kWithDoubles);
+  deoptimization_info_.Add(info);
+  deopt_index_list_.Add(Safepoint::kNoDeoptimizationIndex);
+  if (deopt_mode == Safepoint::kNoLazyDeopt) {
+    last_lazy_safepoint_ = deopt_index_list_.length();
+  }
   indexes_.Add(new ZoneList<int>(8));
   registers_.Add((kind & Safepoint::kWithRegisters)
       ? new ZoneList<int>(4)
       : NULL);
   return Safepoint(indexes_.last(), registers_.last());
 }
 
 
+void SafepointTableBuilder::RecordLazyDeoptimizationIndex(int index) {
+  while (last_lazy_safepoint_ < deopt_index_list_.length()) {
+    deopt_index_list_[last_lazy_safepoint_++] = index;
+  }
+}
+
 unsigned SafepointTableBuilder::GetCodeOffset() const {
   ASSERT(emitted_);
   return offset_;
 }
 
 
 void SafepointTableBuilder::Emit(Assembler* assembler, int bits_per_entry) {
   // For lazy deoptimization we need space to patch a call after every call.
   // Ensure there is always space for such patching, even if the code ends
   // in a call.
@@ skipping 12 matching lines @@
 
   // Compute the number of bytes per safepoint entry.
   int bytes_per_entry =
       RoundUp(bits_per_entry, kBitsPerByte) >> kBitsPerByteLog2;
 
   // Emit the table header.
   int length = deoptimization_info_.length();
   assembler->dd(length);
   assembler->dd(bytes_per_entry);
 
-  // Emit sorted table of pc offsets together with deoptimization indexes and
-  // pc after gap information.
+  // Emit sorted table of pc offsets together with deoptimization indexes.
   for (int i = 0; i < length; i++) {
     assembler->dd(deoptimization_info_[i].pc);
-    assembler->dd(EncodeExceptPC(deoptimization_info_[i]));
+    assembler->dd(EncodeExceptPC(deoptimization_info_[i],
+                                 deopt_index_list_[i]));
   }
 
   // Emit table of bitmaps.
   ZoneList<uint8_t> bits(bytes_per_entry);
   for (int i = 0; i < length; i++) {
     ZoneList<int>* indexes = indexes_[i];
     ZoneList<int>* registers = registers_[i];
     bits.Clear();
     bits.AddBlock(0, bytes_per_entry);
 
@@ skipping 24 matching lines @@
 
     // Emit the bitmap for the current entry.
     for (int k = 0; k < bytes_per_entry; k++) {
       assembler->db(bits[k]);
     }
   }
   emitted_ = true;
 }
 
 
-uint32_t SafepointTableBuilder::EncodeExceptPC(const DeoptimizationInfo& info) {
-  unsigned index = info.deoptimization_index;
-  unsigned gap_size = info.pc_after_gap - info.pc;
+uint32_t SafepointTableBuilder::EncodeExceptPC(const DeoptimizationInfo& info,
+                                               unsigned index) {
   uint32_t encoding = SafepointEntry::DeoptimizationIndexField::encode(index);
-  encoding |= SafepointEntry::GapCodeSizeField::encode(gap_size);
   encoding |= SafepointEntry::ArgumentsField::encode(info.arguments);
   encoding |= SafepointEntry::SaveDoublesField::encode(info.has_doubles);
   return encoding;
 }
 
 
-int SafepointTableBuilder::CountShortDeoptimizationIntervals(unsigned limit) {
-  int result = 0;
-  if (!deoptimization_info_.is_empty()) {
-    unsigned previous_gap_end = deoptimization_info_[0].pc_after_gap;
-    for (int i = 1, n = deoptimization_info_.length(); i < n; i++) {
-      DeoptimizationInfo info = deoptimization_info_[i];
-      if (static_cast<int>(info.deoptimization_index) !=
-          Safepoint::kNoDeoptimizationIndex) {
-        if (previous_gap_end + limit > info.pc) {
-          result++;
-        }
-        previous_gap_end = info.pc_after_gap;
-      }
-    }
-  }
-  return result;
-}
-
-
 
 } }  // namespace v8::internal