1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/sharedRuntime.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,536 @@
1.4 +/*
1.5 + * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +class AdapterHandlerEntry;
1.29 +class vframeStream;
1.30 +
1.31 +// Runtime is the base class for various runtime interfaces
1.32 +// (InterpreterRuntime, CompilerRuntime, etc.). It provides
1.33 +// shared functionality such as exception forwarding (C++ to
1.34 +// Java exceptions), locking/unlocking mechanisms, statistical
1.35 +// information, etc.
1.36 +
1.37 +class SharedRuntime: AllStatic {
1.38 + private:
1.39 + static methodHandle resolve_sub_helper(JavaThread *thread,
1.40 + bool is_virtual,
1.41 + bool is_optimized, TRAPS);
1.42 +
1.43 + // Shared stub locations
1.44 +
1.45 + static RuntimeStub* _wrong_method_blob;
1.46 + static RuntimeStub* _ic_miss_blob;
1.47 + static RuntimeStub* _resolve_opt_virtual_call_blob;
1.48 + static RuntimeStub* _resolve_virtual_call_blob;
1.49 + static RuntimeStub* _resolve_static_call_blob;
1.50 +
1.51 + static SafepointBlob* _polling_page_safepoint_handler_blob;
1.52 + static SafepointBlob* _polling_page_return_handler_blob;
1.53 +#ifdef COMPILER2
1.54 + static ExceptionBlob* _exception_blob;
1.55 + static UncommonTrapBlob* _uncommon_trap_blob;
1.56 +#endif // COMPILER2
1.57 +
1.58 +#ifndef PRODUCT
1.59 +
1.60 + // Counters
1.61 + static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
1.62 +
1.63 +#endif // !PRODUCT
1.64 + public:
1.65 + // The following arithmetic routines are used on platforms that do
1.66 + // not have machine instructions to implement their functionality.
1.67 + // Do not remove these.
1.68 +
1.69 + // long arithmetics
1.70 + static jlong lmul(jlong y, jlong x);
1.71 + static jlong ldiv(jlong y, jlong x);
1.72 + static jlong lrem(jlong y, jlong x);
1.73 +
1.74 + // float and double remainder
1.75 + static jfloat frem(jfloat x, jfloat y);
1.76 + static jdouble drem(jdouble x, jdouble y);
1.77 +
1.78 + // float conversion (needs to set appropriate rounding mode)
1.79 + static jint f2i (jfloat x);
1.80 + static jlong f2l (jfloat x);
1.81 + static jint d2i (jdouble x);
1.82 + static jlong d2l (jdouble x);
1.83 + static jfloat d2f (jdouble x);
1.84 + static jfloat l2f (jlong x);
1.85 + static jdouble l2d (jlong x);
1.86 +
1.87 + // double trigonometrics and transcendentals
1.88 + static jdouble dsin(jdouble x);
1.89 + static jdouble dcos(jdouble x);
1.90 + static jdouble dtan(jdouble x);
1.91 + static jdouble dlog(jdouble x);
1.92 + static jdouble dlog10(jdouble x);
1.93 + static jdouble dexp(jdouble x);
1.94 + static jdouble dpow(jdouble x, jdouble y);
1.95 +
1.96 +
1.97 + // exception handling across interpreter/compiler boundaries
1.98 + static address raw_exception_handler_for_return_address(address return_address);
1.99 + static address exception_handler_for_return_address(address return_address);
1.100 +
1.101 + // exception handling and implicit exceptions
1.102 + static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
1.103 + bool force_unwind, bool top_frame_only);
1.104 + enum ImplicitExceptionKind {
1.105 + IMPLICIT_NULL,
1.106 + IMPLICIT_DIVIDE_BY_ZERO,
1.107 + STACK_OVERFLOW
1.108 + };
1.109 + static void throw_AbstractMethodError(JavaThread* thread);
1.110 + static void throw_ArithmeticException(JavaThread* thread);
1.111 + static void throw_NullPointerException(JavaThread* thread);
1.112 + static void throw_NullPointerException_at_call(JavaThread* thread);
1.113 + static void throw_StackOverflowError(JavaThread* thread);
1.114 + static address continuation_for_implicit_exception(JavaThread* thread,
1.115 + address faulting_pc,
1.116 + ImplicitExceptionKind exception_kind);
1.117 +
1.118 + // Shared stub locations
1.119 + static address get_poll_stub(address pc);
1.120 +
1.121 + static address get_ic_miss_stub() {
1.122 + assert(_ic_miss_blob!= NULL, "oops");
1.123 + return _ic_miss_blob->instructions_begin();
1.124 + }
1.125 +
1.126 + static address get_handle_wrong_method_stub() {
1.127 + assert(_wrong_method_blob!= NULL, "oops");
1.128 + return _wrong_method_blob->instructions_begin();
1.129 + }
1.130 +
1.131 +#ifdef COMPILER2
1.132 + static void generate_uncommon_trap_blob(void);
1.133 + static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
1.134 +#endif // COMPILER2
1.135 +
1.136 + static address get_resolve_opt_virtual_call_stub(){
1.137 + assert(_resolve_opt_virtual_call_blob != NULL, "oops");
1.138 + return _resolve_opt_virtual_call_blob->instructions_begin();
1.139 + }
1.140 + static address get_resolve_virtual_call_stub() {
1.141 + assert(_resolve_virtual_call_blob != NULL, "oops");
1.142 + return _resolve_virtual_call_blob->instructions_begin();
1.143 + }
1.144 + static address get_resolve_static_call_stub() {
1.145 + assert(_resolve_static_call_blob != NULL, "oops");
1.146 + return _resolve_static_call_blob->instructions_begin();
1.147 + }
1.148 +
1.149 + static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
1.150 + static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
1.151 +
1.152 + // Counters
1.153 +#ifndef PRODUCT
1.154 + static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
1.155 +#endif // PRODUCT
1.156 +
1.157 + // Helper routine for full-speed JVMTI exception throwing support
1.158 + static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
1.159 + static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
1.160 +
1.161 + // To be used as the entry point for unresolved native methods.
1.162 + static address native_method_throw_unsatisfied_link_error_entry();
1.163 +
1.164 + // bytecode tracing is only used by the TraceBytecodes
1.165 + static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
1.166 +
1.167 + // Used to back off a spin lock that is under heavy contention
1.168 + static void yield_all(JavaThread* thread, int attempts = 0);
1.169 +
1.170 + static oop retrieve_receiver( symbolHandle sig, frame caller );
1.171 +
1.172 + static void verify_caller_frame(frame caller_frame, methodHandle callee_method) PRODUCT_RETURN;
1.173 + static methodHandle find_callee_method_inside_interpreter(frame caller_frame, methodHandle caller_method, int bci) PRODUCT_RETURN_(return methodHandle(););
1.174 +
1.175 + static void register_finalizer(JavaThread* thread, oopDesc* obj);
1.176 +
1.177 + // dtrace notifications
1.178 + static int dtrace_object_alloc(oopDesc* o);
1.179 + static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
1.180 + static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
1.181 + static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
1.182 +
1.183 + // Utility method for retrieving the Java thread id, returns 0 if the
1.184 + // thread is not a well formed Java thread.
1.185 + static jlong get_java_tid(Thread* thread);
1.186 +
1.187 +
1.188 + // used by native wrappers to reenable yellow if overflow happened in native code
1.189 + static void reguard_yellow_pages();
1.190 +
1.191 + /**
1.192 + * Fill in the "X cannot be cast to a Y" message for ClassCastException
1.193 + *
1.194 + * @param thr the current thread
1.195 + * @param name the name of the class of the object attempted to be cast
1.196 + * @return the dynamically allocated exception message (must be freed
1.197 + * by the caller using a resource mark)
1.198 + *
1.199 + * BCP must refer to the current 'checkcast' opcode for the frame
1.200 + * on top of the stack.
1.201 + * The caller (or one of it's callers) must use a ResourceMark
1.202 + * in order to correctly free the result.
1.203 + */
1.204 + static char* generate_class_cast_message(JavaThread* thr, const char* name);
1.205 +
1.206 + /**
1.207 + * Fill in the "X cannot be cast to a Y" message for ClassCastException
1.208 + *
1.209 + * @param name the name of the class of the object attempted to be cast
1.210 + * @param klass the name of the target klass attempt
1.211 + * @return the dynamically allocated exception message (must be freed
1.212 + * by the caller using a resource mark)
1.213 + *
1.214 + * This version does not require access the frame, so it can be called
1.215 + * from interpreted code
1.216 + * The caller (or one of it's callers) must use a ResourceMark
1.217 + * in order to correctly free the result.
1.218 + */
1.219 + static char* generate_class_cast_message(const char* name, const char* klass);
1.220 +
1.221 + // Resolves a call site- may patch in the destination of the call into the
1.222 + // compiled code.
1.223 + static methodHandle resolve_helper(JavaThread *thread,
1.224 + bool is_virtual,
1.225 + bool is_optimized, TRAPS);
1.226 +
1.227 + static void generate_stubs(void);
1.228 +
1.229 + private:
1.230 + // deopt blob
1.231 + static void generate_deopt_blob(void);
1.232 + static DeoptimizationBlob* _deopt_blob;
1.233 +
1.234 + public:
1.235 + static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
1.236 +
1.237 + // Resets a call-site in compiled code so it will get resolved again.
1.238 + static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
1.239 +
1.240 + // In the code prolog, if the klass comparison fails, the inline cache
1.241 + // misses and the call site is patched to megamorphic
1.242 + static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
1.243 +
1.244 + // Find the method that called us.
1.245 + static methodHandle find_callee_method(JavaThread* thread, TRAPS);
1.246 +
1.247 +
1.248 + private:
1.249 + static Handle find_callee_info(JavaThread* thread,
1.250 + Bytecodes::Code& bc,
1.251 + CallInfo& callinfo, TRAPS);
1.252 + static Handle find_callee_info_helper(JavaThread* thread,
1.253 + vframeStream& vfst,
1.254 + Bytecodes::Code& bc,
1.255 + CallInfo& callinfo, TRAPS);
1.256 +
1.257 + static address clean_virtual_call_entry();
1.258 + static address clean_opt_virtual_call_entry();
1.259 + static address clean_static_call_entry();
1.260 +
1.261 + public:
1.262 +
1.263 +
1.264 + static void create_native_wrapper (JavaThread* thread, methodOop method);
1.265 +
1.266 + // Read the array of BasicTypes from a Java signature, and compute where
1.267 + // compiled Java code would like to put the results. Values in reg_lo and
1.268 + // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
1.269 + // registers, those above refer to 4-byte stack slots. All stack slots are
1.270 + // based off of the window top. SharedInfo::stack0 refers to the first usable
1.271 + // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
1.272 + // 4-bytes higher. So for sparc because the register window save area is at
1.273 + // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
1.274 + // will be just above it. (
1.275 + // return value is the maximum number of VMReg stack slots the convention will use.
1.276 + static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
1.277 +
1.278 + // Ditto except for calling C
1.279 + static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
1.280 +
1.281 + // Generate I2C and C2I adapters. These adapters are simple argument marshalling
1.282 + // blobs. Unlike adapters in the tiger and earlier releases the code in these
1.283 + // blobs does not create a new frame and are therefore virtually invisible
1.284 + // to the stack walking code. In general these blobs extend the callers stack
1.285 + // as needed for the conversion of argument locations.
1.286 +
1.287 + // When calling a c2i blob the code will always call the interpreter even if
1.288 + // by the time we reach the blob there is compiled code available. This allows
1.289 + // the blob to pass the incoming stack pointer (the sender sp) in a known
1.290 + // location for the interpreter to record. This is used by the frame code
1.291 + // to correct the sender code to match up with the stack pointer when the
1.292 + // thread left the compiled code. In addition it allows the interpreter
1.293 + // to remove the space the c2i adapter allocated to do it argument conversion.
1.294 +
1.295 + // Although a c2i blob will always run interpreted even if compiled code is
1.296 + // present if we see that compiled code is present the compiled call site
1.297 + // will be patched/re-resolved so that later calls will run compiled.
1.298 +
1.299 + // Aditionally a c2i blob need to have a unverified entry because it can be reached
1.300 + // in situations where the call site is an inlined cache site and may go megamorphic.
1.301 +
1.302 + // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
1.303 + // that the interpreter before it does any call dispatch will record the current
1.304 + // stack pointer in the interpreter frame. On return it will restore the stack
1.305 + // pointer as needed. This means the i2c adapter code doesn't need any special
1.306 + // handshaking path with compiled code to keep the stack walking correct.
1.307 +
1.308 + static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
1.309 + int total_args_passed,
1.310 + int max_arg,
1.311 + const BasicType *sig_bt,
1.312 + const VMRegPair *regs);
1.313 +
1.314 + // OSR support
1.315 +
1.316 + // OSR_migration_begin will extract the jvm state from an interpreter
1.317 + // frame (locals, monitors) and store the data in a piece of C heap
1.318 + // storage. This then allows the interpreter frame to be removed from the
1.319 + // stack and the OSR nmethod to be called. That method is called with a
1.320 + // pointer to the C heap storage. This pointer is the return value from
1.321 + // OSR_migration_begin.
1.322 +
1.323 + static intptr_t* OSR_migration_begin( JavaThread *thread);
1.324 +
1.325 + // OSR_migration_end is a trivial routine. It is called after the compiled
1.326 + // method has extracted the jvm state from the C heap that OSR_migration_begin
1.327 + // created. It's entire job is to simply free this storage.
1.328 + static void OSR_migration_end ( intptr_t* buf);
1.329 +
1.330 + // Convert a sig into a calling convention register layout
1.331 + // and find interesting things about it.
1.332 + static VMRegPair* find_callee_arguments(symbolOop sig, bool is_static, int *arg_size);
1.333 + static VMReg name_for_receiver();
1.334 +
1.335 + // "Top of Stack" slots that may be unused by the calling convention but must
1.336 + // otherwise be preserved.
1.337 + // On Intel these are not necessary and the value can be zero.
1.338 + // On Sparc this describes the words reserved for storing a register window
1.339 + // when an interrupt occurs.
1.340 + static uint out_preserve_stack_slots();
1.341 +
1.342 + // Save and restore a native result
1.343 + static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
1.344 + static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
1.345 +
1.346 + // Generate a native wrapper for a given method. The method takes arguments
1.347 + // in the Java compiled code convention, marshals them to the native
1.348 + // convention (handlizes oops, etc), transitions to native, makes the call,
1.349 + // returns to java state (possibly blocking), unhandlizes any result and
1.350 + // returns.
1.351 + static nmethod *generate_native_wrapper(MacroAssembler* masm,
1.352 + methodHandle method,
1.353 + int total_args_passed,
1.354 + int max_arg,
1.355 + BasicType *sig_bt,
1.356 + VMRegPair *regs,
1.357 + BasicType ret_type );
1.358 +
1.359 + // A compiled caller has just called the interpreter, but compiled code
1.360 + // exists. Patch the caller so he no longer calls into the interpreter.
1.361 + static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
1.362 +
1.363 + // Slow-path Locking and Unlocking
1.364 + static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
1.365 + static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
1.366 +
1.367 + // Resolving of calls
1.368 + static address resolve_static_call_C (JavaThread *thread);
1.369 + static address resolve_virtual_call_C (JavaThread *thread);
1.370 + static address resolve_opt_virtual_call_C(JavaThread *thread);
1.371 +
1.372 + // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
1.373 + static void slow_arraycopy_C(oopDesc* src, jint src_pos,
1.374 + oopDesc* dest, jint dest_pos,
1.375 + jint length, JavaThread* thread);
1.376 +
1.377 + // handle ic miss with caller being compiled code
1.378 + // wrong method handling (inline cache misses, zombie methods)
1.379 + static address handle_wrong_method(JavaThread* thread);
1.380 + static address handle_wrong_method_ic_miss(JavaThread* thread);
1.381 +
1.382 +#ifndef PRODUCT
1.383 +
1.384 + // Collect and print inline cache miss statistics
1.385 + private:
1.386 + enum { maxICmiss_count = 100 };
1.387 + static int _ICmiss_index; // length of IC miss histogram
1.388 + static int _ICmiss_count[maxICmiss_count]; // miss counts
1.389 + static address _ICmiss_at[maxICmiss_count]; // miss addresses
1.390 + static void trace_ic_miss(address at);
1.391 +
1.392 + public:
1.393 + static int _monitor_enter_ctr; // monitor enter slow
1.394 + static int _monitor_exit_ctr; // monitor exit slow
1.395 + static int _throw_null_ctr; // throwing a null-pointer exception
1.396 + static int _ic_miss_ctr; // total # of IC misses
1.397 + static int _wrong_method_ctr;
1.398 + static int _resolve_static_ctr;
1.399 + static int _resolve_virtual_ctr;
1.400 + static int _resolve_opt_virtual_ctr;
1.401 + static int _implicit_null_throws;
1.402 + static int _implicit_div0_throws;
1.403 +
1.404 + static int _jbyte_array_copy_ctr; // Slow-path byte array copy
1.405 + static int _jshort_array_copy_ctr; // Slow-path short array copy
1.406 + static int _jint_array_copy_ctr; // Slow-path int array copy
1.407 + static int _jlong_array_copy_ctr; // Slow-path long array copy
1.408 + static int _oop_array_copy_ctr; // Slow-path oop array copy
1.409 + static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
1.410 + static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
1.411 + static int _generic_array_copy_ctr; // Slow-path includes type decoding
1.412 + static int _slow_array_copy_ctr; // Slow-path failed out to a method call
1.413 +
1.414 + static int _new_instance_ctr; // 'new' object requires GC
1.415 + static int _new_array_ctr; // 'new' array requires GC
1.416 + static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
1.417 + static int _find_handler_ctr; // find exception handler
1.418 + static int _rethrow_ctr; // rethrow exception
1.419 + static int _mon_enter_stub_ctr; // monitor enter stub
1.420 + static int _mon_exit_stub_ctr; // monitor exit stub
1.421 + static int _mon_enter_ctr; // monitor enter slow
1.422 + static int _mon_exit_ctr; // monitor exit slow
1.423 + static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
1.424 +
1.425 + // Statistics code
1.426 + // stats for "normal" compiled calls (non-interface)
1.427 + static int _nof_normal_calls; // total # of calls
1.428 + static int _nof_optimized_calls; // total # of statically-bound calls
1.429 + static int _nof_inlined_calls; // total # of inlined normal calls
1.430 + static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
1.431 + static int _nof_inlined_static_calls; // total # of inlined static calls
1.432 + // stats for compiled interface calls
1.433 + static int _nof_interface_calls; // total # of compiled calls
1.434 + static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
1.435 + static int _nof_inlined_interface_calls; // total # of inlined interface calls
1.436 + static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
1.437 + // stats for runtime exceptions
1.438 + static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
1.439 +
1.440 + public: // for compiler
1.441 + static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
1.442 + static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
1.443 + static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
1.444 + static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
1.445 + static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
1.446 + static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
1.447 + static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
1.448 + static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
1.449 + static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
1.450 + static void print_call_statistics(int comp_total);
1.451 + static void print_statistics();
1.452 + static void print_ic_miss_histogram();
1.453 +
1.454 +#endif // PRODUCT
1.455 +};
1.456 +
1.457 +
1.458 +// ---------------------------------------------------------------------------
1.459 +// Implementation of AdapterHandlerLibrary
1.460 +//
1.461 +// This library manages argument marshaling adapters and native wrappers.
1.462 +// There are 2 flavors of adapters: I2C and C2I.
1.463 +//
1.464 +// The I2C flavor takes a stock interpreted call setup, marshals the arguments
1.465 +// for a Java-compiled call, and jumps to Rmethod-> code()->
1.466 +// instructions_begin(). It is broken to call it without an nmethod assigned.
1.467 +// The usual behavior is to lift any register arguments up out of the stack
1.468 +// and possibly re-pack the extra arguments to be contigious. I2C adapters
1.469 +// will save what the interpreter's stack pointer will be after arguments are
1.470 +// popped, then adjust the interpreter's frame size to force alignment and
1.471 +// possibly to repack the arguments. After re-packing, it jumps to the
1.472 +// compiled code start. There are no safepoints in this adapter code and a GC
1.473 +// cannot happen while marshaling is in progress.
1.474 +//
1.475 +// The C2I flavor takes a stock compiled call setup plus the target method in
1.476 +// Rmethod, marshals the arguments for an interpreted call and jumps to
1.477 +// Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
1.478 +// setup. Compiled frames are fixed-size and the args are likely not in the
1.479 +// right place. Hence all the args will likely be copied into the
1.480 +// interpreter's frame, forcing that frame to grow. The compiled frame's
1.481 +// outgoing stack args will be dead after the copy.
1.482 +//
1.483 +// Native wrappers, like adapters, marshal arguments. Unlike adapters they
1.484 +// also perform an offical frame push & pop. They have a call to the native
1.485 +// routine in their middles and end in a return (instead of ending in a jump).
1.486 +// The native wrappers are stored in real nmethods instead of the BufferBlobs
1.487 +// used by the adapters. The code generation happens here because it's very
1.488 +// similar to what the adapters have to do.
1.489 +
1.490 +class AdapterHandlerEntry : public CHeapObj {
1.491 + private:
1.492 + address _i2c_entry;
1.493 + address _c2i_entry;
1.494 + address _c2i_unverified_entry;
1.495 +
1.496 + public:
1.497 + AdapterHandlerEntry(address i2c_entry, address c2i_entry, address c2i_unverified_entry):
1.498 + _i2c_entry(i2c_entry),
1.499 + _c2i_entry(c2i_entry),
1.500 + _c2i_unverified_entry(c2i_unverified_entry) {
1.501 + }
1.502 + // The name we give all buffer blobs
1.503 + static const char* name;
1.504 +
1.505 + address get_i2c_entry() { return _i2c_entry; }
1.506 + address get_c2i_entry() { return _c2i_entry; }
1.507 + address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
1.508 + void relocate(address new_base);
1.509 +#ifndef PRODUCT
1.510 + void print();
1.511 +#endif /* PRODUCT */
1.512 +};
1.513 +
1.514 +
1.515 +class AdapterHandlerLibrary: public AllStatic {
1.516 + private:
1.517 + enum {
1.518 + AbstractMethodHandler = 1 // special handler for abstract methods
1.519 + };
1.520 + static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection
1.521 + static GrowableArray<AdapterHandlerEntry*> * _handlers; // the corresponding handlers
1.522 + static u_char _buffer[]; // the temporary code buffer
1.523 + static void initialize();
1.524 + static AdapterHandlerEntry* get_entry( int index ) { return _handlers->at(index); }
1.525 + static int get_create_adapter_index(methodHandle method);
1.526 + static address get_i2c_entry( int index ) { return get_entry(index)->get_i2c_entry(); }
1.527 + static address get_c2i_entry( int index ) { return get_entry(index)->get_c2i_entry(); }
1.528 + static address get_c2i_unverified_entry( int index ) { return get_entry(index)->get_c2i_unverified_entry(); }
1.529 +
1.530 + public:
1.531 + static nmethod* create_native_wrapper(methodHandle method);
1.532 + static AdapterHandlerEntry* get_adapter(methodHandle method) { return get_entry(get_create_adapter_index(method)); }
1.533 +
1.534 +#ifndef PRODUCT
1.535 + static void print_handler(CodeBlob* b);
1.536 + static bool contains(CodeBlob* b);
1.537 +#endif /* PRODUCT */
1.538 +
1.539 +};
