diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/runtime/sharedRuntime.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/runtime/sharedRuntime.hpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,719 @@ +/* + * Copyright (c) 1997, 2017, 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); + +#if INCLUDE_ALL_GCS + // G1 write barriers + static void g1_wb_pre(oopDesc* orig, JavaThread *thread); + static void g1_wb_post(void* card_addr, JavaThread* thread); +#endif // INCLUDE_ALL_GCS + + // 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 + + 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); + + // 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); + + // 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_abstract(JavaThread* thread); + static address handle_wrong_method_ic_miss(JavaThread* thread); + + static address handle_unsafe_access(JavaThread* thread, address next_pc); + +#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 _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 contiguous. +// 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 official 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 + // verifying adapter equivalence. + unsigned char* _saved_code; + int _saved_code_length; +#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; + _saved_code_length = 0; +#endif + } + + void deallocate(); + + // should never be used + AdapterHandlerEntry(); + + public: + address get_i2c_entry() const { return _i2c_entry; } + address get_c2i_entry() const { return _c2i_entry; } + address get_c2i_unverified_entry() const { return _c2i_unverified_entry; } + address base_address(); + void relocate(address new_base); + + AdapterFingerPrint* fingerprint() const { 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); + bool compare_code(unsigned char* code, int length); +#endif + + //virtual void print_on(outputStream* st) const; DO NOT USE + void print_adapter_on(outputStream* st) const; +}; + +// This class is used only with DumpSharedSpaces==true. It holds extra information +// that's used only during CDS dump time. +// For details, see comments around Method::link_method() +class CDSAdapterHandlerEntry: public AdapterHandlerEntry { + address _c2i_entry_trampoline; // allocated from shared spaces "MC" region + AdapterHandlerEntry** _adapter_trampoline; // allocated from shared spaces "MD" region + +public: + address get_c2i_entry_trampoline() const { return _c2i_entry_trampoline; } + AdapterHandlerEntry** get_adapter_trampoline() const { return _adapter_trampoline; } + void init() NOT_CDS_RETURN; +}; + + +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(); + static AdapterHandlerEntry* get_adapter0(const methodHandle& method); + + public: + + static AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, + address i2c_entry, address c2i_entry, address c2i_unverified_entry); + static void create_native_wrapper(const methodHandle& method); + static AdapterHandlerEntry* get_adapter(const methodHandle& method); + + static void print_handler(const CodeBlob* b) { print_handler_on(tty, b); } + static void print_handler_on(outputStream* st, const CodeBlob* b); + static bool contains(const CodeBlob* b); +#ifndef PRODUCT + static void print_statistics(); +#endif // PRODUCT + +}; + +#endif // SHARE_VM_RUNTIME_SHAREDRUNTIME_HPP