/*

 * Copyright (c) 1997, 2010, 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.

 *

 */

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 {

 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* _ic_miss_blob;

  static RuntimeStub* _resolve_opt_virtual_call_blob;

  static RuntimeStub* _resolve_virtual_call_blob;

  static RuntimeStub* _resolve_static_call_blob;

  static SafepointBlob* _polling_page_safepoint_handler_blob;

  static SafepointBlob* _polling_page_return_handler_blob;

#ifdef COMPILER2

  static ExceptionBlob*       _exception_blob;

  static UncommonTrapBlob*    _uncommon_trap_blob;

#endif // COMPILER2

#ifndef PRODUCT

  // Counters

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

#endif // !PRODUCT

 public:

  // 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 __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);

  static double dsqrt(double f);

#endif

#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);

#ifndef SERIALGC

  // G1 write barriers

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

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

#endif // !SERIALGC

  // exception handling and implicit exceptions

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

                                              bool force_unwind, bool top_frame_only);

  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 address continuation_for_implicit_exception(JavaThread* thread,

                                                     address faulting_pc,

                                                     ImplicitExceptionKind exception_kind);

  // Shared stub locations

  static address get_poll_stub(address pc);

  static address get_ic_miss_stub() {

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

  }

  static address get_handle_wrong_method_stub() {

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

  }

#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");

  }

  static address get_resolve_virtual_call_stub() {

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

  }

  static address get_resolve_static_call_stub() {

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

  }

  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; }

  // 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, symbolOop name, const char *message = NULL);

  // RedefineClasses() tracing support for obsolete method entry

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

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

  static address native_method_throw_unsatisfied_link_error_entry();

  // bytecode tracing is only used by the TraceBytecodes

  static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;

  // Used to back off a spin lock that is under heavy contention

  static void yield_all(JavaThread* thread, int attempts = 0);

  static oop retrieve_receiver( symbolHandle sig, frame caller );

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

  // dtrace notifications

  static int dtrace_object_alloc(oopDesc* o);

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

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

  static int dtrace_method_exit(JavaThread* thread, methodOopDesc* 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 name the name of the class of the object attempted to be cast

   * @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 it's callers) must use a ResourceMark

   * in order to correctly free the result.

   */

  static char* generate_class_cast_message(JavaThread* thr, const char* name);

  /**

   * Fill in the message for a WrongMethodTypeException

   *

   * @param thr the current thread

   * @param mtype (optional) expected method type (or argument class)

   * @param mhandle (optional) actual method handle (or argument)

   * @return the dynamically allocated exception message

   *

   * BCP for the frame on top of the stack must refer to an

   * 'invokevirtual' op for a method handle, or an 'invokedyamic' op.

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

   * in order to correctly free the result.

   */

  static char* generate_wrong_method_type_message(JavaThread* thr,

                                                  oopDesc* mtype = NULL,

                                                  oopDesc* mhandle = NULL);

  /** Return non-null if the mtype is a klass or Class, not a MethodType. */

  static oop wrong_method_type_is_for_single_argument(JavaThread* thr,

                                                      oopDesc* mtype);

  /**

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

   *

   * @param name the name of the class of the object attempted to be cast

   * @param klass the name of the target klass attempt

   * @param gripe the specific kind of problem being reported

   * @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(const char* name, const char* klass,

                                           const char* gripe = " cannot be cast to ");

  // 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);

  static void generate_stubs(void);

  private:

  // deopt blob

  static void generate_deopt_blob(void);

  static DeoptimizationBlob* _deopt_blob;

  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 address clean_virtual_call_entry();

  static address clean_opt_virtual_call_entry();

  static address clean_static_call_entry();

 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);

  // Ditto except for calling C

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

  // 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 it 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.

  // Aditionally 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);

  // 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(symbolOop sig, bool has_receiver, 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();

  // 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.

  static nmethod *generate_native_wrapper(MacroAssembler* masm,

                                          methodHandle method,

                                          int total_args_passed,

                                          int max_arg,

                                          BasicType *sig_bt,

                                          VMRegPair *regs,

                                          BasicType ret_type );

#ifdef HAVE_DTRACE_H

  // Generate a dtrace 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.

  static nmethod *generate_dtrace_nmethod(MacroAssembler* masm,

                                          methodHandle method);

  // dtrace support to convert a Java string to utf8

  static void get_utf(oopDesc* src, address dst);

#endif // def HAVE_DTRACE_H

  // 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(methodOopDesc* moop, address ret_pc);

  // 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);

  // Resolving of calls

  static address resolve_static_call_C     (JavaThread *thread);

  static address resolve_virtual_call_C    (JavaThread *thread);

  static address resolve_opt_virtual_call_C(JavaThread *thread);

  // arraycopy, the non-leaf version.  (See StubRoutines for all the leaf calls.)

  static void slow_arraycopy_C(oopDesc* src,  jint src_pos,

                               oopDesc* dest, jint dest_pos,

                               jint length, JavaThread* thread);

  // handle ic miss with caller being compiled code

  // wrong method handling (inline cache misses, zombie methods)

  static address handle_wrong_method(JavaThread* thread);

  static address handle_wrong_method_ic_miss(JavaThread* thread);

#ifndef PRODUCT

  // Collect and print inline cache miss statistics

 private:

  enum { maxICmiss_count = 100 };

  static int     _ICmiss_index;                  // length of IC miss histogram

  static int     _ICmiss_count[maxICmiss_count]; // miss counts

  static address _ICmiss_at[maxICmiss_count];    // miss addresses

  static void trace_ic_miss(address at);

 public:

  static int _monitor_enter_ctr;                 // monitor enter slow

  static int _monitor_exit_ctr;                  // monitor exit slow

  static int _throw_null_ctr;                    // throwing a null-pointer exception

  static int _ic_miss_ctr;                       // total # of IC misses

  static int _wrong_method_ctr;

  static int _resolve_static_ctr;

  static int _resolve_virtual_ctr;

  static int _resolve_opt_virtual_ctr;

  static int _implicit_null_throws;

  static int _implicit_div0_throws;

  static int _jbyte_array_copy_ctr;        // Slow-path byte array copy

  static int _jshort_array_copy_ctr;       // Slow-path short array copy

  static int _jint_array_copy_ctr;         // Slow-path int array copy

  static int _jlong_array_copy_ctr;        // Slow-path long array copy

  static int _oop_array_copy_ctr;          // Slow-path oop array copy

  static int _checkcast_array_copy_ctr;    // Slow-path oop array copy, with cast

  static int _unsafe_array_copy_ctr;       // Slow-path includes alignment checks

  static int _generic_array_copy_ctr;      // Slow-path includes type decoding

  static int _slow_array_copy_ctr;         // Slow-path failed out to a method call

  static int _new_instance_ctr;            // 'new' object requires GC

  static int _new_array_ctr;               // 'new' array requires GC

  static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;

  static int _find_handler_ctr;            // find exception handler

  static int _rethrow_ctr;                 // rethrow exception

  static int _mon_enter_stub_ctr;          // monitor enter stub

  static int _mon_exit_stub_ctr;           // monitor exit stub

  static int _mon_enter_ctr;               // monitor enter slow

  static int _mon_exit_ctr;                // monitor exit slow

  static int _partial_subtype_ctr;         // SubRoutines::partial_subtype_check

  // Statistics code

  // stats for "normal" compiled calls (non-interface)

  static int     _nof_normal_calls;              // total # of calls

  static int     _nof_optimized_calls;           // total # of statically-bound calls

  static int     _nof_inlined_calls;             // total # of inlined normal calls

  static int     _nof_static_calls;              // total # of calls to static methods or super methods (invokespecial)

  static int     _nof_inlined_static_calls;      // total # of inlined static calls