[perf-prof][arm64] Emit unwinding info to record the saved FP

src/compiler/arm64/unwinding-info-writer-arm64.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/arm64/unwinding-info-writer-arm64.h"
 #include "src/compiler/instruction.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 void UnwindingInfoWriter::BeginInstructionBlock(int pc_offset,
                                                 const InstructionBlock* block) {
   if (!enabled()) return;
 
   block_will_exit_ = false;
 
   DCHECK_LT(block->rpo_number().ToInt(),
             static_cast<int>(block_initial_states_.size()));
   const BlockInitialState* initial_state =
       block_initial_states_[block->rpo_number().ToInt()];
   if (initial_state) {
     if (initial_state->saved_lr_ != saved_lr_) {
       eh_frame_writer_.AdvanceLocation(pc_offset);
       if (initial_state->saved_lr_) {
         eh_frame_writer_.RecordRegisterSavedToStack(lr, kPointerSize);
+        eh_frame_writer_.RecordRegisterSavedToStack(fp, 0);
       } else {
         eh_frame_writer_.RecordRegisterFollowsInitialRule(lr);
       }
       saved_lr_ = initial_state->saved_lr_;
     }
   } else {
     // The entry block always lacks an explicit initial state.
     // The exit block may lack an explicit state, if it is only reached by
     //   the block ending in a ret.
     // All the other blocks must have an explicit initial state.
@@ skipping 32 matching lines @@
   // |    LR    |               |            |
   // +----------+               |            |
   // | saved FP |               |            |
   // +----------+ <-- FP                     v
   // |   ....   |                       stack growth
   //
   // The LR is pushed on the stack, and we can record this fact at the end of
   // the construction, since the LR itself is not modified in the process.
   eh_frame_writer_.AdvanceLocation(at_pc);
   eh_frame_writer_.RecordRegisterSavedToStack(lr, kPointerSize);
+  eh_frame_writer_.RecordRegisterSavedToStack(fp, 0);
   saved_lr_ = true;
 }
 
 void UnwindingInfoWriter::MarkFrameDeconstructed(int at_pc) {
   if (!enabled()) return;
 
   // The lr is restored by the last operation in LeaveFrame().
   eh_frame_writer_.AdvanceLocation(at_pc);
   eh_frame_writer_.RecordRegisterFollowsInitialRule(lr);
   saved_lr_ = false;
@@ skipping 12 matching lines @@
   if (!enabled()) return;
 
   eh_frame_writer_.AdvanceLocation(pc_offset);
   eh_frame_writer_.SetBaseAddressRegisterAndOffset(fp, 0);
   eh_frame_writer_.RecordRegisterFollowsInitialRule(lr);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8