--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/sharedRuntime.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,536 @@
+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class AdapterHandlerEntry;
+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:
+ // 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);
+
+ // 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);
+
+ // 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);
+
+
+ // exception handling across interpreter/compiler boundaries
+ static address raw_exception_handler_for_return_address(address return_address);
+ static address exception_handler_for_return_address(address return_address);
+
+ // 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_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->instructions_begin();
+ }
+
+ static address get_handle_wrong_method_stub() {
+ assert(_wrong_method_blob!= NULL, "oops");
+ return _wrong_method_blob->instructions_begin();
+ }
+
+#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->instructions_begin();
+ }
+ static address get_resolve_virtual_call_stub() {
+ assert(_resolve_virtual_call_blob != NULL, "oops");
+ return _resolve_virtual_call_blob->instructions_begin();
+ }
+ static address get_resolve_static_call_stub() {
+ assert(_resolve_static_call_blob != NULL, "oops");
+ return _resolve_static_call_blob->instructions_begin();
+ }
+
+ 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);
+
+ // 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 verify_caller_frame(frame caller_frame, methodHandle callee_method) PRODUCT_RETURN;
+ static methodHandle find_callee_method_inside_interpreter(frame caller_frame, methodHandle caller_method, int bci) PRODUCT_RETURN_(return methodHandle(););
+
+ 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 "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
+ * @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);
+
+ // 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:
+
+
+ static void create_native_wrapper (JavaThread* thread, methodOop method);
+
+ // 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);
+
+ // 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 is_static, 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 );
+
+ // 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()->
+// instructions_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 CHeapObj {
+ private:
+ address _i2c_entry;
+ address _c2i_entry;
+ address _c2i_unverified_entry;
+
+ public:
+ AdapterHandlerEntry(address i2c_entry, address c2i_entry, address c2i_unverified_entry):
+ _i2c_entry(i2c_entry),
+ _c2i_entry(c2i_entry),
+ _c2i_unverified_entry(c2i_unverified_entry) {
+ }
+ // The name we give all buffer blobs
+ static const char* name;
+
+ 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);
+#ifndef PRODUCT
+ void print();
+#endif /* PRODUCT */
+};
+
+
+class AdapterHandlerLibrary: public AllStatic {
+ private:
+ enum {
+ AbstractMethodHandler = 1 // special handler for abstract methods
+ };
+ static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection
+ static GrowableArray<AdapterHandlerEntry*> * _handlers; // the corresponding handlers
+ static u_char _buffer[]; // the temporary code buffer
+ static void initialize();
+ static AdapterHandlerEntry* get_entry( int index ) { return _handlers->at(index); }
+ static int get_create_adapter_index(methodHandle method);
+ static address get_i2c_entry( int index ) { return get_entry(index)->get_i2c_entry(); }
+ static address get_c2i_entry( int index ) { return get_entry(index)->get_c2i_entry(); }
+ static address get_c2i_unverified_entry( int index ) { return get_entry(index)->get_c2i_unverified_entry(); }
+
+ public:
+ static nmethod* create_native_wrapper(methodHandle method);
+ static AdapterHandlerEntry* get_adapter(methodHandle method) { return get_entry(get_create_adapter_index(method)); }
+
+#ifndef PRODUCT
+ static void print_handler(CodeBlob* b);
+ static bool contains(CodeBlob* b);
+#endif /* PRODUCT */
+
+};