/*

 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP

#define SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP

#include "interpreter/bytecodeHistogram.hpp"

#include "interpreter/bytecodeTracer.hpp"

#include "interpreter/linkResolver.hpp"

#include "memory/allocation.hpp"

#include "memory/resourceArea.hpp"

#include "utilities/hashtable.hpp"

#include "utilities/macros.hpp"

class AdapterHandlerEntry;

class AdapterHandlerTable;

class AdapterFingerPrint;

class vframeStream;

// Runtime is the base class for various runtime interfaces

// (InterpreterRuntime, CompilerRuntime, etc.). It provides

// shared functionality such as exception forwarding (C++ to

// Java exceptions), locking/unlocking mechanisms, statistical

// information, etc.

class SharedRuntime: AllStatic {

  friend class VMStructs;

 private:

  static methodHandle resolve_sub_helper(JavaThread *thread,

                                         bool is_virtual,

                                         bool is_optimized, TRAPS);

  // Shared stub locations

  static RuntimeStub*        _wrong_method_blob;

  static RuntimeStub*        _wrong_method_abstract_blob;

  static RuntimeStub*        _ic_miss_blob;

  static RuntimeStub*        _resolve_opt_virtual_call_blob;

  static RuntimeStub*        _resolve_virtual_call_blob;

  static RuntimeStub*        _resolve_static_call_blob;

  static address             _resolve_static_call_entry;

  static DeoptimizationBlob* _deopt_blob;

  static SafepointBlob*      _polling_page_vectors_safepoint_handler_blob;

  static SafepointBlob*      _polling_page_safepoint_handler_blob;

  static SafepointBlob*      _polling_page_return_handler_blob;

#ifdef COMPILER2

  static UncommonTrapBlob*   _uncommon_trap_blob;

#endif // COMPILER2

#ifndef PRODUCT

  // Counters

  static int     _nof_megamorphic_calls;         // total # of megamorphic calls (through vtable)

#endif // !PRODUCT

 private:

  enum { POLL_AT_RETURN,  POLL_AT_LOOP, POLL_AT_VECTOR_LOOP };

  static SafepointBlob* generate_handler_blob(address call_ptr, int poll_type);

  static RuntimeStub*   generate_resolve_blob(address destination, const char* name);

 public:

  static void generate_stubs(void);

  // max bytes for each dtrace string parameter

  enum { max_dtrace_string_size = 256 };

  // The following arithmetic routines are used on platforms that do

  // not have machine instructions to implement their functionality.

  // Do not remove these.

  // long arithmetics

  static jlong   lmul(jlong y, jlong x);

  static jlong   ldiv(jlong y, jlong x);

  static jlong   lrem(jlong y, jlong x);

  // float and double remainder

  static jfloat  frem(jfloat  x, jfloat  y);

  static jdouble drem(jdouble x, jdouble y);

#ifdef _WIN64

  // Workaround for fmod issue in the Windows x64 CRT

  static double fmod_winx64(double x, double y);

#endif

#ifdef __SOFTFP__

  static jfloat  fadd(jfloat x, jfloat y);

  static jfloat  fsub(jfloat x, jfloat y);

  static jfloat  fmul(jfloat x, jfloat y);

  static jfloat  fdiv(jfloat x, jfloat y);

  static jdouble dadd(jdouble x, jdouble y);

  static jdouble dsub(jdouble x, jdouble y);

  static jdouble dmul(jdouble x, jdouble y);

  static jdouble ddiv(jdouble x, jdouble y);

#endif // __SOFTFP__

  // float conversion (needs to set appropriate rounding mode)

  static jint    f2i (jfloat  x);

  static jlong   f2l (jfloat  x);

  static jint    d2i (jdouble x);

  static jlong   d2l (jdouble x);

  static jfloat  d2f (jdouble x);

  static jfloat  l2f (jlong   x);

  static jdouble l2d (jlong   x);

#ifdef __SOFTFP__

  static jfloat  i2f (jint    x);

  static jdouble i2d (jint    x);

  static jdouble f2d (jfloat  x);

#endif // __SOFTFP__

  // double trigonometrics and transcendentals

  static jdouble dsin(jdouble x);

  static jdouble dcos(jdouble x);

  static jdouble dtan(jdouble x);

  static jdouble dlog(jdouble x);

  static jdouble dlog10(jdouble x);

  static jdouble dexp(jdouble x);

  static jdouble dpow(jdouble x, jdouble y);

#if defined(__SOFTFP__) || defined(E500V2)

  static double dabs(double f);

#endif

#if defined(__SOFTFP__) || defined(PPC)

  static double dsqrt(double f);

#endif

  // Montgomery multiplication

  static void montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,

                                  jint len, jlong inv, jint *m_ints);

  static void montgomery_square(jint *a_ints, jint *n_ints,

                                jint len, jlong inv, jint *m_ints);

#ifdef __SOFTFP__

  // C++ compiler generates soft float instructions as well as passing

  // float and double in registers.

  static int  fcmpl(float x, float y);

  static int  fcmpg(float x, float y);

  static int  dcmpl(double x, double y);

  static int  dcmpg(double x, double y);

  static int unordered_fcmplt(float x, float y);

  static int unordered_dcmplt(double x, double y);

  static int unordered_fcmple(float x, float y);

  static int unordered_dcmple(double x, double y);

  static int unordered_fcmpge(float x, float y);

  static int unordered_dcmpge(double x, double y);

  static int unordered_fcmpgt(float x, float y);

  static int unordered_dcmpgt(double x, double y);

  static float  fneg(float f);

  static double dneg(double f);

#endif

  // exception handling across interpreter/compiler boundaries

  static address raw_exception_handler_for_return_address(JavaThread* thread, address return_address);

  static address exception_handler_for_return_address(JavaThread* thread, address return_address);

  // G1 write barriers

  static void g1_wb_pre(oopDesc* orig, JavaThread *thread);

  static void g1_wb_post(void* card_addr, JavaThread* thread);

  // exception handling and implicit exceptions

  static address compute_compiled_exc_handler(CompiledMethod* nm, address ret_pc, Handle& exception,

                                              bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);

  enum ImplicitExceptionKind {

    IMPLICIT_NULL,

    IMPLICIT_DIVIDE_BY_ZERO,

    STACK_OVERFLOW

  };

  static void    throw_AbstractMethodError(JavaThread* thread);

  static void    throw_IncompatibleClassChangeError(JavaThread* thread);

  static void    throw_ArithmeticException(JavaThread* thread);

  static void    throw_NullPointerException(JavaThread* thread);

  static void    throw_NullPointerException_at_call(JavaThread* thread);

  static void    throw_StackOverflowError(JavaThread* thread);

  static void    throw_delayed_StackOverflowError(JavaThread* thread);

  static void    throw_StackOverflowError_common(JavaThread* thread, bool delayed);

  static address continuation_for_implicit_exception(JavaThread* thread,

                                                     address faulting_pc,

                                                     ImplicitExceptionKind exception_kind);

#if INCLUDE_JVMCI

  static address deoptimize_for_implicit_exception(JavaThread* thread, address pc, CompiledMethod* nm, int deopt_reason);

#endif

  // Post-slow-path-allocation, pre-initializing-stores step for

  // implementing e.g. ReduceInitialCardMarks

  static void on_slowpath_allocation_exit(JavaThread* thread);

  static void enable_stack_reserved_zone(JavaThread* thread);

  static frame look_for_reserved_stack_annotated_method(JavaThread* thread, frame fr);

  // Shared stub locations

  static address get_poll_stub(address pc);

  static address get_ic_miss_stub() {

    assert(_ic_miss_blob!= NULL, "oops");

    return _ic_miss_blob->entry_point();

  }

  static address get_handle_wrong_method_stub() {

    assert(_wrong_method_blob!= NULL, "oops");

    return _wrong_method_blob->entry_point();

  }

  static address get_handle_wrong_method_abstract_stub() {

    assert(_wrong_method_abstract_blob!= NULL, "oops");

    return _wrong_method_abstract_blob->entry_point();

  }

#ifdef COMPILER2

  static void generate_uncommon_trap_blob(void);

  static UncommonTrapBlob* uncommon_trap_blob()                  { return _uncommon_trap_blob; }

#endif // COMPILER2

  static address get_resolve_opt_virtual_call_stub() {

    assert(_resolve_opt_virtual_call_blob != NULL, "oops");

    return _resolve_opt_virtual_call_blob->entry_point();

  }

  static address get_resolve_virtual_call_stub() {

    assert(_resolve_virtual_call_blob != NULL, "oops");

    return _resolve_virtual_call_blob->entry_point();

  }

  static address get_resolve_static_call_stub() {

    assert(_resolve_static_call_blob != NULL, "oops");

    return _resolve_static_call_blob->entry_point();

  }

  static SafepointBlob* polling_page_return_handler_blob()     { return _polling_page_return_handler_blob; }

  static SafepointBlob* polling_page_safepoint_handler_blob()  { return _polling_page_safepoint_handler_blob; }

  static SafepointBlob* polling_page_vectors_safepoint_handler_blob()  { return _polling_page_vectors_safepoint_handler_blob; }

  // Counters

#ifndef PRODUCT

  static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }

#endif // PRODUCT

  // Helper routine for full-speed JVMTI exception throwing support

  static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);

  static void throw_and_post_jvmti_exception(JavaThread *thread, Symbol* name, const char *message = NULL);

  // RedefineClasses() tracing support for obsolete method entry

  static int rc_trace_method_entry(JavaThread* thread, Method* m);

  // To be used as the entry point for unresolved native methods.

  static address native_method_throw_unsatisfied_link_error_entry();

  static address native_method_throw_unsupported_operation_exception_entry();

  static oop retrieve_receiver(Symbol* sig, frame caller);

  static void register_finalizer(JavaThread* thread, oopDesc* obj);

  // dtrace notifications

  static int dtrace_object_alloc(oopDesc* o, int size);

  static int dtrace_object_alloc_base(Thread* thread, oopDesc* o, int size);

  static int dtrace_method_entry(JavaThread* thread, Method* m);

  static int dtrace_method_exit(JavaThread* thread, Method* m);

  // Utility method for retrieving the Java thread id, returns 0 if the

  // thread is not a well formed Java thread.

  static jlong get_java_tid(Thread* thread);

  // used by native wrappers to reenable yellow if overflow happened in native code

  static void reguard_yellow_pages();

  // Fill in the "X cannot be cast to a Y" message for ClassCastException

  //

  // @param thr the current thread

  // @param caster_klass the class of the object we are casting

  // @return the dynamically allocated exception message (must be freed

  // by the caller using a resource mark)

  //

  // BCP must refer to the current 'checkcast' opcode for the frame

  // on top of the stack.

  // The caller (or one of its callers) must use a ResourceMark

  // in order to correctly free the result.

  //

  static char* generate_class_cast_message(JavaThread* thr, Klass* caster_klass);

  // Fill in the "X cannot be cast to a Y" message for ClassCastException

  //

  // @param caster_klass the class of the object we are casting

  // @param target_klass the target klass attempt

  // @return the dynamically allocated exception message (must be freed

  // by the caller using a resource mark)

  //

  // This version does not require access the frame, so it can be called

  // from interpreted code

  // The caller (or one of it's callers) must use a ResourceMark

  // in order to correctly free the result.

  //

  static char* generate_class_cast_message(Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name = NULL);

  // Resolves a call site- may patch in the destination of the call into the

  // compiled code.

  static methodHandle resolve_helper(JavaThread *thread,

                                     bool is_virtual,

                                     bool is_optimized, TRAPS);

 private:

  // deopt blob

  static void generate_deopt_blob(void);

 public:

  static DeoptimizationBlob* deopt_blob(void)      { return _deopt_blob; }

  // Resets a call-site in compiled code so it will get resolved again.

  static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);

  // In the code prolog, if the klass comparison fails, the inline cache

  // misses and the call site is patched to megamorphic

  static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);

  // Find the method that called us.

  static methodHandle find_callee_method(JavaThread* thread, TRAPS);

 private:

  static Handle find_callee_info(JavaThread* thread,

                                 Bytecodes::Code& bc,

                                 CallInfo& callinfo, TRAPS);

  static Handle find_callee_info_helper(JavaThread* thread,

                                        vframeStream& vfst,

                                        Bytecodes::Code& bc,

                                        CallInfo& callinfo, TRAPS);

  static methodHandle extract_attached_method(vframeStream& vfst);

  static address clean_virtual_call_entry();

  static address clean_opt_virtual_call_entry();

  static address clean_static_call_entry();

#if defined(X86) && defined(COMPILER1)

  // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.

  static void inline_check_hashcode_from_object_header(MacroAssembler* masm, const methodHandle& method, Register obj_reg, Register result);

#endif // X86 && COMPILER1

 public:

  // Read the array of BasicTypes from a Java signature, and compute where

  // compiled Java code would like to put the results.  Values in reg_lo and

  // reg_hi refer to 4-byte quantities.  Values less than SharedInfo::stack0 are

  // registers, those above refer to 4-byte stack slots.  All stack slots are

  // based off of the window top.  SharedInfo::stack0 refers to the first usable

  // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word

  // 4-bytes higher. So for sparc because the register window save area is at

  // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0

  // will be just above it. (

  // return value is the maximum number of VMReg stack slots the convention will use.

  static int java_calling_convention(const BasicType* sig_bt, VMRegPair* regs, int total_args_passed, int is_outgoing);

  static void check_member_name_argument_is_last_argument(const methodHandle& method,

                                                          const BasicType* sig_bt,

                                                          const VMRegPair* regs) NOT_DEBUG_RETURN;

  // Ditto except for calling C

  //

  // C argument in register AND stack slot.

  // Some architectures require that an argument must be passed in a register

  // AND in a stack slot. These architectures provide a second VMRegPair array

  // to be filled by the c_calling_convention method. On other architectures,

  // NULL is being passed as the second VMRegPair array, so arguments are either

  // passed in a register OR in a stack slot.

  static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,

                                  int total_args_passed);

  static size_t trampoline_size();

  static void generate_trampoline(MacroAssembler *masm, address destination);

  // Generate I2C and C2I adapters. These adapters are simple argument marshalling

  // blobs. Unlike adapters in the tiger and earlier releases the code in these

  // blobs does not create a new frame and are therefore virtually invisible

  // to the stack walking code. In general these blobs extend the callers stack

  // as needed for the conversion of argument locations.

  // When calling a c2i blob the code will always call the interpreter even if

  // by the time we reach the blob there is compiled code available. This allows

  // the blob to pass the incoming stack pointer (the sender sp) in a known

  // location for the interpreter to record. This is used by the frame code

  // to correct the sender code to match up with the stack pointer when the

  // thread left the compiled code. In addition it allows the interpreter

  // to remove the space the c2i adapter allocated to do its argument conversion.

  // Although a c2i blob will always run interpreted even if compiled code is

  // present if we see that compiled code is present the compiled call site

  // will be patched/re-resolved so that later calls will run compiled.

  // Additionally a c2i blob need to have a unverified entry because it can be reached

  // in situations where the call site is an inlined cache site and may go megamorphic.

  // A i2c adapter is simpler than the c2i adapter. This is because it is assumed

  // that the interpreter before it does any call dispatch will record the current

  // stack pointer in the interpreter frame. On return it will restore the stack

  // pointer as needed. This means the i2c adapter code doesn't need any special

  // handshaking path with compiled code to keep the stack walking correct.

  static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,

                                                      int total_args_passed,

                                                      int max_arg,

                                                      const BasicType *sig_bt,

                                                      const VMRegPair *regs,

                                                      AdapterFingerPrint* fingerprint);

  static void gen_i2c_adapter(MacroAssembler *_masm,

                              int total_args_passed,

                              int comp_args_on_stack,

                              const BasicType *sig_bt,

                              const VMRegPair *regs);

  // OSR support

  // OSR_migration_begin will extract the jvm state from an interpreter

  // frame (locals, monitors) and store the data in a piece of C heap

  // storage. This then allows the interpreter frame to be removed from the

  // stack and the OSR nmethod to be called. That method is called with a

  // pointer to the C heap storage. This pointer is the return value from

  // OSR_migration_begin.

  static intptr_t* OSR_migration_begin(JavaThread *thread);

  // OSR_migration_end is a trivial routine. It is called after the compiled

  // method has extracted the jvm state from the C heap that OSR_migration_begin

  // created. It's entire job is to simply free this storage.

  static void OSR_migration_end(intptr_t* buf);

  // Convert a sig into a calling convention register layout

  // and find interesting things about it.

  static VMRegPair* find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int *arg_size);

  static VMReg name_for_receiver();

  // "Top of Stack" slots that may be unused by the calling convention but must

  // otherwise be preserved.

  // On Intel these are not necessary and the value can be zero.

  // On Sparc this describes the words reserved for storing a register window

  // when an interrupt occurs.

  static uint out_preserve_stack_slots();

  // Is vector's size (in bytes) bigger than a size saved by default?

  // For example, on x86 16 bytes XMM registers are saved by default.

  static bool is_wide_vector(int size);

  // Save and restore a native result

  static void    save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);

  static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots);

  // Generate a native wrapper for a given method.  The method takes arguments

  // in the Java compiled code convention, marshals them to the native

  // convention (handlizes oops, etc), transitions to native, makes the call,

  // returns to java state (possibly blocking), unhandlizes any result and

  // returns.

  //

  // The wrapper may contain special-case code if the given method

  // is a JNI critical method, or a compiled method handle adapter,

  // such as _invokeBasic, _linkToVirtual, etc.

  static nmethod* generate_native_wrapper(MacroAssembler* masm,

                                          const methodHandle& method,

                                          int compile_id,

                                          BasicType* sig_bt,

                                          VMRegPair* regs,

                                          BasicType ret_type);

  // Block before entering a JNI critical method

  static void block_for_jni_critical(JavaThread* thread);

  // A compiled caller has just called the interpreter, but compiled code

  // exists.  Patch the caller so he no longer calls into the interpreter.

  static void fixup_callers_callsite(Method* moop, address ret_pc);

  static bool should_fixup_call_destination(address destination, address entry_point, address caller_pc, Method* moop, CodeBlob* cb);

  // Slow-path Locking and Unlocking

  static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);

  static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);