jdk8-mips64-public/hotspot: src/share/vm/runtime/sharedRuntime.hpp@01147d8aac1d (annotated)

src/share/vm/runtime/sharedRuntime.hpp@01147d8aac1d (annotated)

src/share/vm/runtime/sharedRuntime.hpp

Tue, 26 Apr 2011 14:04:43 -0400

author: coleenp
date: Tue, 26 Apr 2011 14:04:43 -0400
changeset 2804: 01147d8aac1d
parent 2687: 3d58a4983660
child 2895: 167b70ff3abc
permissions: -rw-r--r--

7009923: JSR 292: VM crash in JavaThread::last_frame
Summary: Handle stack overflow before the first frame is called, by printing out the called method and not walking the stack.
Reviewed-by: dholmes, phh, dsamersoff

 /*
  * Copyright (c) 1997, 2011, 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 "runtime/threadLocalStorage.hpp"
 #include "utilities/hashtable.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 {
  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);
 #endif
 #if defined(__SOFTFP__) || defined(PPC)
   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");
     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();
   }
 #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; }
   // 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, 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( Symbol* 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(Symbol* 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 compile_id,
                                           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
   // stats for compiled interface calls
   static int     _nof_interface_calls;           // total # of compiled calls
   static int     _nof_optimized_interface_calls; // total # of statically-bound interface calls
   static int     _nof_inlined_interface_calls;   // total # of inlined interface calls
   static int     _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
   // stats for runtime exceptions
   static int     _nof_removable_exceptions;      // total # of exceptions that could be replaced by branches due to inlining
  public: // for compiler
   static address nof_normal_calls_addr()                { return (address)&_nof_normal_calls; }
   static address nof_optimized_calls_addr()             { return (address)&_nof_optimized_calls; }
   static address nof_inlined_calls_addr()               { return (address)&_nof_inlined_calls; }
   static address nof_static_calls_addr()                { return (address)&_nof_static_calls; }
   static address nof_inlined_static_calls_addr()        { return (address)&_nof_inlined_static_calls; }
   static address nof_interface_calls_addr()             { return (address)&_nof_interface_calls; }
   static address nof_optimized_interface_calls_addr()   { return (address)&_nof_optimized_interface_calls; }
   static address nof_inlined_interface_calls_addr()     { return (address)&_nof_inlined_interface_calls; }
   static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
   static void print_call_statistics(int comp_total);
   static void print_statistics();
   static void print_ic_miss_histogram();
 #endif // PRODUCT
 };
 // ---------------------------------------------------------------------------
 // Implementation of AdapterHandlerLibrary
 //
 // This library manages argument marshaling adapters and native wrappers.
 // There are 2 flavors of adapters: I2C and C2I.
 //
 // The I2C flavor takes a stock interpreted call setup, marshals the
 // arguments for a Java-compiled call, and jumps to Rmethod-> code()->
 // code_begin().  It is broken to call it without an nmethod assigned.
 // The usual behavior is to lift any register arguments up out of the
 // stack and possibly re-pack the extra arguments to be contigious.
 // I2C adapters will save what the interpreter's stack pointer will be
 // after arguments are popped, then adjust the interpreter's frame
 // size to force alignment and possibly to repack the arguments.
 // After re-packing, it jumps to the compiled code start.  There are
 // no safepoints in this adapter code and a GC cannot happen while
 // marshaling is in progress.
 //
 // The C2I flavor takes a stock compiled call setup plus the target method in
 // Rmethod, marshals the arguments for an interpreted call and jumps to
 // Rmethod->_i2i_entry.  On entry, the interpreted frame has not yet been
 // setup.  Compiled frames are fixed-size and the args are likely not in the
 // right place.  Hence all the args will likely be copied into the
 // interpreter's frame, forcing that frame to grow.  The compiled frame's
 // outgoing stack args will be dead after the copy.
 //
 // Native wrappers, like adapters, marshal arguments.  Unlike adapters they
 // also perform an offical frame push & pop.  They have a call to the native
 // routine in their middles and end in a return (instead of ending in a jump).
 // The native wrappers are stored in real nmethods instead of the BufferBlobs
 // used by the adapters.  The code generation happens here because it's very
 // similar to what the adapters have to do.
 class AdapterHandlerEntry : public BasicHashtableEntry {
   friend class AdapterHandlerTable;
  private:
   AdapterFingerPrint* _fingerprint;
   address _i2c_entry;
   address _c2i_entry;
   address _c2i_unverified_entry;
 #ifdef ASSERT
   // Captures code and signature used to generate this adapter when
   // verifing adapter equivalence.
   unsigned char* _saved_code;
   int            _code_length;
   BasicType*     _saved_sig;
   int            _total_args_passed;
 #endif
   void init(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry) {
     _fingerprint = fingerprint;
     _i2c_entry = i2c_entry;
     _c2i_entry = c2i_entry;
     _c2i_unverified_entry = c2i_unverified_entry;
 #ifdef ASSERT
     _saved_code = NULL;
     _code_length = 0;
     _saved_sig = NULL;
     _total_args_passed = 0;
 #endif
   }
   void deallocate();
   // should never be used
   AdapterHandlerEntry();
  public:
   address get_i2c_entry()            { return _i2c_entry; }
   address get_c2i_entry()            { return _c2i_entry; }
   address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
   void relocate(address new_base);
   AdapterFingerPrint* fingerprint()  { return _fingerprint; }
   AdapterHandlerEntry* next() {
     return (AdapterHandlerEntry*)BasicHashtableEntry::next();
   }
 #ifdef ASSERT
   // Used to verify that code generated for shared adapters is equivalent
   void save_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
   bool compare_code(unsigned char* code, int length, int total_args_passed, BasicType* sig_bt);
 #endif
   void print();
 };
 class AdapterHandlerLibrary: public AllStatic {
  private:
   static BufferBlob* _buffer; // the temporary code buffer in CodeCache
   static AdapterHandlerTable* _adapters;
   static AdapterHandlerEntry* _abstract_method_handler;
   static BufferBlob* buffer_blob();
   static void initialize();
  public:
   static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint,
                                         address i2c_entry, address c2i_entry, address c2i_unverified_entry);
   static nmethod* create_native_wrapper(methodHandle method, int compile_id);
   static AdapterHandlerEntry* get_adapter(methodHandle method);
 #ifdef HAVE_DTRACE_H
   static nmethod* create_dtrace_nmethod (methodHandle method);
 #endif // HAVE_DTRACE_H
   static void print_handler(CodeBlob* b) { print_handler_on(tty, b); }
   static void print_handler_on(outputStream* st, CodeBlob* b);
   static bool contains(CodeBlob* b);
 #ifndef PRODUCT
   static void print_statistics();
 #endif /* PRODUCT */
 };
 #endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/sharedRuntime.hpp@01147d8aac1d (annotated)

src/share/vm/runtime/sharedRuntime.hpp