annotate src/share/vm/interpreter/abstractInterpreter.hpp @ 900:9987d9d5eb0e

6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot Summary: developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens Reviewed-by: kvn, never, jrose, twisti
author cfang
date Fri, 31 Jul 2009 17:12:33 -0700
parents be93aad57795
children ddb7834449d0
rev   line source
duke@0 1 /*
jrose@710 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
duke@0 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@0 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@0 21 * have any questions.
duke@0 22 *
duke@0 23 */
duke@0 24
twisti@605 25 // This file contains the platform-independent parts
duke@0 26 // of the abstract interpreter and the abstract interpreter generator.
duke@0 27
duke@0 28 // Organization of the interpreter(s). There exists two different interpreters in hotpot
duke@0 29 // an assembly language version (aka template interpreter) and a high level language version
duke@0 30 // (aka c++ interpreter). Th division of labor is as follows:
duke@0 31
duke@0 32 // Template Interpreter C++ Interpreter Functionality
duke@0 33 //
duke@0 34 // templateTable* bytecodeInterpreter* actual interpretation of bytecodes
duke@0 35 //
duke@0 36 // templateInterpreter* cppInterpreter* generation of assembly code that creates
duke@0 37 // and manages interpreter runtime frames.
duke@0 38 // Also code for populating interpreter
duke@0 39 // frames created during deoptimization.
duke@0 40 //
duke@0 41 // For both template and c++ interpreter. There are common files for aspects of the interpreter
duke@0 42 // that are generic to both interpreters. This is the layout:
duke@0 43 //
duke@0 44 // abstractInterpreter.hpp: generic description of the interpreter.
duke@0 45 // interpreter*: generic frame creation and handling.
duke@0 46 //
duke@0 47
duke@0 48 //------------------------------------------------------------------------------------------------------------------------
duke@0 49 // The C++ interface to the bytecode interpreter(s).
duke@0 50
duke@0 51 class AbstractInterpreter: AllStatic {
duke@0 52 friend class VMStructs;
duke@0 53 friend class Interpreter;
duke@0 54 friend class CppInterpreterGenerator;
duke@0 55 public:
duke@0 56 enum MethodKind {
duke@0 57 zerolocals, // method needs locals initialization
duke@0 58 zerolocals_synchronized, // method needs locals initialization & is synchronized
duke@0 59 native, // native method
duke@0 60 native_synchronized, // native method & is synchronized
duke@0 61 empty, // empty method (code: _return)
duke@0 62 accessor, // accessor method (code: _aload_0, _getfield, _(a|i)return)
duke@0 63 abstract, // abstract method (throws an AbstractMethodException)
jrose@710 64 method_handle, // java.dyn.MethodHandles::invoke
duke@0 65 java_lang_math_sin, // implementation of java.lang.Math.sin (x)
duke@0 66 java_lang_math_cos, // implementation of java.lang.Math.cos (x)
duke@0 67 java_lang_math_tan, // implementation of java.lang.Math.tan (x)
duke@0 68 java_lang_math_abs, // implementation of java.lang.Math.abs (x)
duke@0 69 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
duke@0 70 java_lang_math_log, // implementation of java.lang.Math.log (x)
duke@0 71 java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
duke@0 72 number_of_method_entries,
duke@0 73 invalid = -1
duke@0 74 };
duke@0 75
duke@0 76 enum SomeConstants {
duke@0 77 number_of_result_handlers = 10 // number of result handlers for native calls
duke@0 78 };
duke@0 79
duke@0 80 protected:
duke@0 81 static StubQueue* _code; // the interpreter code (codelets)
duke@0 82
duke@0 83 static bool _notice_safepoints; // true if safepoints are activated
duke@0 84
duke@0 85 static address _native_entry_begin; // Region for native entry code
duke@0 86 static address _native_entry_end;
duke@0 87
duke@0 88 // method entry points
duke@0 89 static address _entry_table[number_of_method_entries]; // entry points for a given method
duke@0 90 static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers
duke@0 91 static address _slow_signature_handler; // the native method generic (slow) signature handler
duke@0 92
duke@0 93 static address _rethrow_exception_entry; // rethrows an activation in previous frame
duke@0 94
duke@0 95 friend class AbstractInterpreterGenerator;
duke@0 96 friend class InterpreterGenerator;
duke@0 97 friend class InterpreterMacroAssembler;
duke@0 98
duke@0 99 public:
duke@0 100 // Initialization/debugging
duke@0 101 static void initialize();
duke@0 102 static StubQueue* code() { return _code; }
duke@0 103
duke@0 104
duke@0 105 // Method activation
duke@0 106 static MethodKind method_kind(methodHandle m);
duke@0 107 static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
duke@0 108 static address entry_for_method(methodHandle m) { return _entry_table[method_kind(m)]; }
duke@0 109
duke@0 110 static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
duke@0 111
duke@0 112 // Runtime support
duke@0 113
duke@0 114 // length = invoke bytecode length (to advance to next bytecode)
duke@0 115 static address deopt_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
duke@0 116 static address return_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
duke@0 117
duke@0 118 static address rethrow_exception_entry() { return _rethrow_exception_entry; }
duke@0 119
duke@0 120 // Activation size in words for a method that is just being called.
duke@0 121 // Parameters haven't been pushed so count them too.
duke@0 122 static int size_top_interpreter_activation(methodOop method);
duke@0 123
duke@0 124 // Deoptimization support
cfang@900 125 // Compute the entry address for continuation after
cfang@900 126 static address deopt_continue_after_entry(methodOop method,
cfang@900 127 address bcp,
cfang@900 128 int callee_parameters,
cfang@900 129 bool is_top_frame);
cfang@900 130 // Compute the entry address for reexecution
cfang@900 131 static address deopt_reexecute_entry(methodOop method, address bcp);
cfang@900 132 // Deoptimization should reexecute this bytecode
cfang@900 133 static bool bytecode_should_reexecute(Bytecodes::Code code);
duke@0 134
duke@0 135 // share implementation of size_activation and layout_activation:
duke@0 136 static int size_activation(methodOop method,
duke@0 137 int temps,
duke@0 138 int popframe_args,
duke@0 139 int monitors,
duke@0 140 int callee_params,
duke@0 141 int callee_locals,
duke@0 142 bool is_top_frame);
duke@0 143
duke@0 144 static int layout_activation(methodOop method,
duke@0 145 int temps,
duke@0 146 int popframe_args,
duke@0 147 int monitors,
duke@0 148 int callee_params,
duke@0 149 int callee_locals,
duke@0 150 frame* caller,
duke@0 151 frame* interpreter_frame,
duke@0 152 bool is_top_frame);
duke@0 153
duke@0 154 // Runtime support
duke@0 155 static bool is_not_reached( methodHandle method, int bci);
duke@0 156 // Safepoint support
duke@0 157 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
duke@0 158 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
duke@0 159
duke@0 160 // Support for native calls
duke@0 161 static address slow_signature_handler() { return _slow_signature_handler; }
duke@0 162 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
duke@0 163 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
duke@0 164 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; }
duke@0 165 // Debugging/printing
duke@0 166 static void print(); // prints the interpreter code
duke@0 167
duke@0 168 // Support for Tagged Stacks
duke@0 169 //
duke@0 170 // Tags are stored on the Java Expression stack above the value:
duke@0 171 //
duke@0 172 // tag
duke@0 173 // value
duke@0 174 //
duke@0 175 // For double values:
duke@0 176 //
duke@0 177 // tag2
duke@0 178 // high word
duke@0 179 // tag1
duke@0 180 // low word
duke@0 181
duke@0 182 public:
duke@0 183 static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; }
duke@0 184 static int stackElementSize() { return stackElementWords()*wordSize; }
duke@0 185 static int logStackElementSize() { return
duke@0 186 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
duke@0 187
duke@0 188 // Tag is at pointer, value is one below for a stack growing down
duke@0 189 // (or above for stack growing up)
duke@0 190 static int value_offset_in_bytes() {
duke@0 191 return TaggedStackInterpreter ?
duke@0 192 frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
duke@0 193 }
duke@0 194 static int tag_offset_in_bytes() {
duke@0 195 assert(TaggedStackInterpreter, "should not call this");
duke@0 196 return 0;
duke@0 197 }
duke@0 198
duke@0 199 // Tagged Locals
duke@0 200 // Locals are stored relative to Llocals:
duke@0 201 //
duke@0 202 // tag <- Llocals[n]
duke@0 203 // value
duke@0 204 //
duke@0 205 // Category 2 types are indexed as:
duke@0 206 //
duke@0 207 // tag <- Llocals[-n]
duke@0 208 // high word
duke@0 209 // tag <- Llocals[-n+1]
duke@0 210 // low word
duke@0 211 //
duke@0 212
duke@0 213 // Local values relative to locals[n]
duke@0 214 static int local_offset_in_bytes(int n) {
duke@0 215 return ((frame::interpreter_frame_expression_stack_direction() * n) *
duke@0 216 stackElementSize()) + value_offset_in_bytes();
duke@0 217 }
duke@0 218 static int local_tag_offset_in_bytes(int n) {
duke@0 219 assert(TaggedStackInterpreter, "should not call this");
duke@0 220 return ((frame::interpreter_frame_expression_stack_direction() * n) *
duke@0 221 stackElementSize()) + tag_offset_in_bytes();
duke@0 222 }
duke@0 223
jrose@726 224 // access to stacked values according to type:
jrose@726 225 static oop* oop_addr_in_slot(intptr_t* slot_addr) {
jrose@726 226 return (oop*) slot_addr;
jrose@726 227 }
jrose@726 228 static jint* int_addr_in_slot(intptr_t* slot_addr) {
jrose@726 229 if ((int) sizeof(jint) < wordSize && !Bytes::is_Java_byte_ordering_different())
jrose@726 230 // big-endian LP64
jrose@726 231 return (jint*)(slot_addr + 1) - 1;
jrose@726 232 else
jrose@726 233 return (jint*) slot_addr;
jrose@726 234 }
jrose@726 235 static jlong long_in_slot(intptr_t* slot_addr) {
jrose@726 236 if (sizeof(intptr_t) >= sizeof(jlong)) {
jrose@726 237 return *(jlong*) slot_addr;
jrose@726 238 } else if (!TaggedStackInterpreter) {
jrose@726 239 return Bytes::get_native_u8((address)slot_addr);
jrose@726 240 } else {
jrose@726 241 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32");
jrose@726 242 // assemble the long in memory order (not arithmetic order)
jrose@726 243 union { jlong j; jint i[2]; } u;
jrose@726 244 u.i[0] = (jint) slot_addr[0*stackElementSize()];
jrose@726 245 u.i[1] = (jint) slot_addr[1*stackElementSize()];
jrose@726 246 return u.j;
jrose@726 247 }
jrose@726 248 }
jrose@726 249 static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
jrose@726 250 if (sizeof(intptr_t) >= sizeof(jlong)) {
jrose@726 251 *(jlong*) slot_addr = value;
jrose@726 252 } else if (!TaggedStackInterpreter) {
jrose@726 253 Bytes::put_native_u8((address)slot_addr, value);
jrose@726 254 } else {
jrose@726 255 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32");
jrose@726 256 // assemble the long in memory order (not arithmetic order)
jrose@726 257 union { jlong j; jint i[2]; } u;
jrose@726 258 u.j = value;
jrose@726 259 slot_addr[0*stackElementSize()] = (intptr_t) u.i[0];
jrose@726 260 slot_addr[1*stackElementSize()] = (intptr_t) u.i[1];
jrose@726 261 }
jrose@726 262 }
jrose@726 263 static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
jrose@726 264 switch (type) {
jrose@726 265 case T_BOOLEAN: value->z = *int_addr_in_slot(slot_addr); break;
jrose@726 266 case T_CHAR: value->c = *int_addr_in_slot(slot_addr); break;
jrose@726 267 case T_BYTE: value->b = *int_addr_in_slot(slot_addr); break;
jrose@726 268 case T_SHORT: value->s = *int_addr_in_slot(slot_addr); break;
jrose@726 269 case T_INT: value->i = *int_addr_in_slot(slot_addr); break;
jrose@726 270 case T_LONG: value->j = long_in_slot(slot_addr); break;
jrose@726 271 case T_FLOAT: value->f = *(jfloat*)int_addr_in_slot(slot_addr); break;
jrose@726 272 case T_DOUBLE: value->d = jdouble_cast(long_in_slot(slot_addr)); break;
jrose@726 273 case T_OBJECT: value->l = (jobject)*oop_addr_in_slot(slot_addr); break;
jrose@726 274 default: ShouldNotReachHere();
jrose@726 275 }
jrose@726 276 }
jrose@726 277 static void set_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
jrose@726 278 switch (type) {
jrose@726 279 case T_BOOLEAN: *int_addr_in_slot(slot_addr) = (value->z != 0); break;
jrose@726 280 case T_CHAR: *int_addr_in_slot(slot_addr) = value->c; break;
jrose@726 281 case T_BYTE: *int_addr_in_slot(slot_addr) = value->b; break;
jrose@726 282 case T_SHORT: *int_addr_in_slot(slot_addr) = value->s; break;
jrose@726 283 case T_INT: *int_addr_in_slot(slot_addr) = value->i; break;
jrose@726 284 case T_LONG: set_long_in_slot(slot_addr, value->j); break;
jrose@726 285 case T_FLOAT: *(jfloat*)int_addr_in_slot(slot_addr) = value->f; break;
jrose@726 286 case T_DOUBLE: set_long_in_slot(slot_addr, jlong_cast(value->d)); break;
jrose@726 287 case T_OBJECT: *oop_addr_in_slot(slot_addr) = (oop) value->l; break;
jrose@726 288 default: ShouldNotReachHere();
jrose@726 289 }
jrose@726 290 }
duke@0 291 };
duke@0 292
duke@0 293 //------------------------------------------------------------------------------------------------------------------------
duke@0 294 // The interpreter generator.
duke@0 295
duke@0 296 class Template;
duke@0 297 class AbstractInterpreterGenerator: public StackObj {
duke@0 298 protected:
duke@0 299 InterpreterMacroAssembler* _masm;
duke@0 300
duke@0 301 // shared code sequences
duke@0 302 // Converter for native abi result to tosca result
duke@0 303 address generate_result_handler_for(BasicType type);
duke@0 304 address generate_slow_signature_handler();
duke@0 305
duke@0 306 // entry point generator
duke@0 307 address generate_method_entry(AbstractInterpreter::MethodKind kind);
duke@0 308
duke@0 309 void bang_stack_shadow_pages(bool native_call);
duke@0 310
duke@0 311 void generate_all();
duke@0 312
duke@0 313 public:
duke@0 314 AbstractInterpreterGenerator(StubQueue* _code);
duke@0 315 };