JDK14/Java14源码在线阅读

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 * Copyright (c) 2014, 2015, Red Hat Inc. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef CPU_AARCH64_INTERP_MASM_AARCH64_HPP
#define CPU_AARCH64_INTERP_MASM_AARCH64_HPP

#include "asm/macroAssembler.hpp"
#include "interpreter/invocationCounter.hpp"
#include "runtime/frame.hpp"

// This file specializes the assember with interpreter-specific macros

typedef ByteSize (*OffsetFunction)(uint);

class InterpreterMacroAssembler: public MacroAssembler {
 protected:

 protected:
  // Interpreter specific version of call_VM_base
  using MacroAssembler::call_VM_leaf_base;

  virtual void call_VM_leaf_base(address entry_point,
                                 int number_of_arguments);

  virtual void call_VM_base(Register oop_result,
                            Register java_thread,
                            Register last_java_sp,
                            address  entry_point,
                            int number_of_arguments,
                            bool check_exceptions);

  // base routine for all dispatches
  void dispatch_base(TosState state, address* table,
                     bool verifyoop = true, bool generate_poll = false);

 public:
  InterpreterMacroAssembler(CodeBuffer* code) : MacroAssembler(code) {}

  void load_earlyret_value(TosState state);

  void jump_to_entry(address entry);

  virtual void check_and_handle_popframe(Register java_thread);
  virtual void check_and_handle_earlyret(Register java_thread);

  // Interpreter-specific registers
  void save_bcp() {
    str(rbcp, Address(rfp, frame::interpreter_frame_bcp_offset * wordSize));
  }

  void restore_bcp() {
    ldr(rbcp, Address(rfp, frame::interpreter_frame_bcp_offset * wordSize));
  }

  void restore_locals() {
    ldr(rlocals, Address(rfp, frame::interpreter_frame_locals_offset * wordSize));
  }

  void restore_constant_pool_cache() {
    ldr(rcpool, Address(rfp, frame::interpreter_frame_cache_offset * wordSize));
  }

  void get_dispatch();

  // Helpers for runtime call arguments/results

  // Helpers for runtime call arguments/results
  void get_method(Register reg) {
    ldr(reg, Address(rfp, frame::interpreter_frame_method_offset * wordSize));
  }

  void get_const(Register reg) {
    get_method(reg);
    ldr(reg, Address(reg, in_bytes(Method::const_offset())));
  }

  void get_constant_pool(Register reg) {
    get_const(reg);
    ldr(reg, Address(reg, in_bytes(ConstMethod::constants_offset())));
  }

  void get_constant_pool_cache(Register reg) {
    get_constant_pool(reg);
    ldr(reg, Address(reg, ConstantPool::cache_offset_in_bytes()));
  }

  void get_cpool_and_tags(Register cpool, Register tags) {
    get_constant_pool(cpool);
    ldr(tags, Address(cpool, ConstantPool::tags_offset_in_bytes()));
  }

  void get_unsigned_2_byte_index_at_bcp(Register reg, int bcp_offset);
  void get_cache_and_index_at_bcp(Register cache, Register index, int bcp_offset, size_t index_size = sizeof(u2));
  void get_cache_and_index_and_bytecode_at_bcp(Register cache, Register index, Register bytecode, int byte_no, int bcp_offset, size_t index_size = sizeof(u2));
  void get_cache_entry_pointer_at_bcp(Register cache, Register tmp, int bcp_offset, size_t index_size = sizeof(u2));
  void get_cache_index_at_bcp(Register index, int bcp_offset, size_t index_size = sizeof(u2));
  void get_method_counters(Register method, Register mcs, Label& skip);

  // load cpool->resolved_references(index);
  void load_resolved_reference_at_index(Register result, Register index, Register tmp = r5);

  // load cpool->resolved_klass_at(index);
  void load_resolved_klass_at_offset(Register cpool, Register index, Register klass, Register temp);

  void load_resolved_method_at_index(int byte_no, Register method, Register cache);

  void pop_ptr(Register r = r0);
  void pop_i(Register r = r0);
  void pop_l(Register r = r0);
  void pop_f(FloatRegister r = v0);
  void pop_d(FloatRegister r = v0);
  void push_ptr(Register r = r0);
  void push_i(Register r = r0);
  void push_l(Register r = r0);
  void push_f(FloatRegister r = v0);
  void push_d(FloatRegister r = v0);

  void pop(Register r ) { ((MacroAssembler*)this)->pop(r); }

  void push(Register r ) { ((MacroAssembler*)this)->push(r); }

  void pop(TosState state); // transition vtos -> state
  void push(TosState state); // transition state -> vtos

  void pop(RegSet regs, Register stack) { ((MacroAssembler*)this)->pop(regs, stack); }
  void push(RegSet regs, Register stack) { ((MacroAssembler*)this)->push(regs, stack); }

  void empty_expression_stack() {
    ldr(esp, Address(rfp, frame::interpreter_frame_monitor_block_top_offset * wordSize));
    // NULL last_sp until next java call
    str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
  }

  // Helpers for swap and dup
  void load_ptr(int n, Register val);
  void store_ptr(int n, Register val);

// Load float value from 'address'. The value is loaded onto the FPU register v0.
  void load_float(Address src);
  void load_double(Address src);

  // Generate a subtype check: branch to ok_is_subtype if sub_klass is
  // a subtype of super_klass.
  void gen_subtype_check( Register sub_klass, Label &ok_is_subtype );

  // Dispatching
  void dispatch_prolog(TosState state, int step = 0);
  void dispatch_epilog(TosState state, int step = 0);
  // dispatch via rscratch1
  void dispatch_only(TosState state, bool generate_poll = false);
  // dispatch normal table via rscratch1 (assume rscratch1 is loaded already)
  void dispatch_only_normal(TosState state);
  void dispatch_only_noverify(TosState state);
  // load rscratch1 from [rbcp + step] and dispatch via rscratch1
  void dispatch_next(TosState state, int step = 0, bool generate_poll = false);
  // load rscratch1 from [esi] and dispatch via rscratch1 and table
  void dispatch_via (TosState state, address* table);

  // jump to an invoked target
  void prepare_to_jump_from_interpreted();
  void jump_from_interpreted(Register method, Register temp);


  // Returning from interpreted functions
  //
  // Removes the current activation (incl. unlocking of monitors)
  // and sets up the return address.  This code is also used for
  // exception unwindwing. In that case, we do not want to throw
  // IllegalMonitorStateExceptions, since that might get us into an
  // infinite rethrow exception loop.
  // Additionally this code is used for popFrame and earlyReturn.
  // In popFrame case we want to skip throwing an exception,
  // installing an exception, and notifying jvmdi.
  // In earlyReturn case we only want to skip throwing an exception
  // and installing an exception.
  void remove_activation(TosState state,
                         bool throw_monitor_exception = true,
                         bool install_monitor_exception = true,
                         bool notify_jvmdi = true);

  // FIXME: Give us a valid frame at a null check.
  virtual void null_check(Register reg, int offset = -1) {
// #ifdef ASSERT
//     save_bcp();
//     set_last_Java_frame(esp, rfp, (address) pc());
// #endif
    MacroAssembler::null_check(reg, offset);
// #ifdef ASSERT
//     reset_last_Java_frame(true);
// #endif
  }

  // Object locking
  void lock_object  (Register lock_reg);
  void unlock_object(Register lock_reg);

  // Interpreter profiling operations
  void set_method_data_pointer_for_bcp();
  void test_method_data_pointer(Register mdp, Label& zero_continue);
  void verify_method_data_pointer();

  void set_mdp_data_at(Register mdp_in, int constant, Register value);
  void increment_mdp_data_at(Address data, bool decrement = false);
  void increment_mdp_data_at(Register mdp_in, int constant,
                             bool decrement = false);
  void increment_mdp_data_at(Register mdp_in, Register reg, int constant,
                             bool decrement = false);
  void increment_mask_and_jump(Address counter_addr,
                               int increment, Address mask,
                               Register scratch, Register scratch2,
                               bool preloaded, Condition cond,
                               Label* where);
  void set_mdp_flag_at(Register mdp_in, int flag_constant);
  void test_mdp_data_at(Register mdp_in, int offset, Register value,
                        Register test_value_out,
                        Label& not_equal_continue);

  void record_klass_in_profile(Register receiver, Register mdp,
                               Register reg2, bool is_virtual_call);
  void record_klass_in_profile_helper(Register receiver, Register mdp,
                                      Register reg2, int start_row,
                                      Label& done, bool is_virtual_call);
  void record_item_in_profile_helper(Register item, Register mdp,
                                     Register reg2, int start_row, Label& done, int total_rows,
                                     OffsetFunction item_offset_fn, OffsetFunction item_count_offset_fn,
                                     int non_profiled_offset);

  void update_mdp_by_offset(Register mdp_in, int offset_of_offset);
  void update_mdp_by_offset(Register mdp_in, Register reg, int offset_of_disp);
  void update_mdp_by_constant(Register mdp_in, int constant);
  void update_mdp_for_ret(Register return_bci);

  // narrow int return value
  void narrow(Register result);

  void profile_taken_branch(Register mdp, Register bumped_count);
  void profile_not_taken_branch(Register mdp);
  void profile_call(Register mdp);
  void profile_final_call(Register mdp);
  void profile_virtual_call(Register receiver, Register mdp,
                            Register scratch2,
                            bool receiver_can_be_null = false);
  void profile_called_method(Register method, Register mdp, Register reg2) NOT_JVMCI_RETURN;
  void profile_ret(Register return_bci, Register mdp);
  void profile_null_seen(Register mdp);

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