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hotspot/src/share/vm/interpreter/abstractInterpreter.hpp
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hotspot/src/share/vm/interpreter/abstractInterpreter.hpp
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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// This file contains the platform-independant parts
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// of the abstract interpreter and the abstract interpreter generator.
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// Organization of the interpreter(s). There exists two different interpreters in hotpot
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// an assembly language version (aka template interpreter) and a high level language version
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// (aka c++ interpreter). Th division of labor is as follows:
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// Template Interpreter C++ Interpreter Functionality
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//
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// templateTable* bytecodeInterpreter* actual interpretation of bytecodes
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//
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// templateInterpreter* cppInterpreter* generation of assembly code that creates
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// and manages interpreter runtime frames.
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// Also code for populating interpreter
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// frames created during deoptimization.
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//
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// For both template and c++ interpreter. There are common files for aspects of the interpreter
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// that are generic to both interpreters. This is the layout:
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//
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// abstractInterpreter.hpp: generic description of the interpreter.
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// interpreter*: generic frame creation and handling.
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//
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//------------------------------------------------------------------------------------------------------------------------
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// The C++ interface to the bytecode interpreter(s).
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class AbstractInterpreter: AllStatic {
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friend class VMStructs;
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friend class Interpreter;
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friend class CppInterpreterGenerator;
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public:
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enum MethodKind {
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zerolocals, // method needs locals initialization
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zerolocals_synchronized, // method needs locals initialization & is synchronized
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native, // native method
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native_synchronized, // native method & is synchronized
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empty, // empty method (code: _return)
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accessor, // accessor method (code: _aload_0, _getfield, _(a|i)return)
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abstract, // abstract method (throws an AbstractMethodException)
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java_lang_math_sin, // implementation of java.lang.Math.sin (x)
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java_lang_math_cos, // implementation of java.lang.Math.cos (x)
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java_lang_math_tan, // implementation of java.lang.Math.tan (x)
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java_lang_math_abs, // implementation of java.lang.Math.abs (x)
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java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
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java_lang_math_log, // implementation of java.lang.Math.log (x)
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java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
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number_of_method_entries,
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invalid = -1
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};
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enum SomeConstants {
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number_of_result_handlers = 10 // number of result handlers for native calls
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};
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protected:
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static StubQueue* _code; // the interpreter code (codelets)
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static bool _notice_safepoints; // true if safepoints are activated
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static address _native_entry_begin; // Region for native entry code
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static address _native_entry_end;
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// method entry points
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static address _entry_table[number_of_method_entries]; // entry points for a given method
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static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers
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static address _slow_signature_handler; // the native method generic (slow) signature handler
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static address _rethrow_exception_entry; // rethrows an activation in previous frame
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friend class AbstractInterpreterGenerator;
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friend class InterpreterGenerator;
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friend class InterpreterMacroAssembler;
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public:
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// Initialization/debugging
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static void initialize();
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static StubQueue* code() { return _code; }
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// Method activation
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static MethodKind method_kind(methodHandle m);
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static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
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static address entry_for_method(methodHandle m) { return _entry_table[method_kind(m)]; }
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static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
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// Runtime support
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// length = invoke bytecode length (to advance to next bytecode)
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static address deopt_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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static address return_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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static address rethrow_exception_entry() { return _rethrow_exception_entry; }
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// Activation size in words for a method that is just being called.
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// Parameters haven't been pushed so count them too.
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static int size_top_interpreter_activation(methodOop method);
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// Deoptimization support
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static address continuation_for(methodOop method,
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address bcp,
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int callee_parameters,
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bool is_top_frame,
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bool& use_next_mdp);
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// share implementation of size_activation and layout_activation:
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static int size_activation(methodOop method,
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int temps,
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int popframe_args,
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int monitors,
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int callee_params,
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int callee_locals,
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bool is_top_frame);
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static int layout_activation(methodOop method,
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int temps,
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int popframe_args,
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int monitors,
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int callee_params,
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int callee_locals,
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frame* caller,
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frame* interpreter_frame,
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bool is_top_frame);
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// Runtime support
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static bool is_not_reached( methodHandle method, int bci);
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// Safepoint support
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static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
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static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
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// Support for native calls
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static address slow_signature_handler() { return _slow_signature_handler; }
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static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
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static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
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static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; }
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// Debugging/printing
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static void print(); // prints the interpreter code
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// Support for Tagged Stacks
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//
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// Tags are stored on the Java Expression stack above the value:
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//
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// tag
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// value
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//
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// For double values:
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//
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// tag2
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// high word
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// tag1
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// low word
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public:
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static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; }
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static int stackElementSize() { return stackElementWords()*wordSize; }
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static int logStackElementSize() { return
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TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
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// Tag is at pointer, value is one below for a stack growing down
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// (or above for stack growing up)
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static int value_offset_in_bytes() {
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return TaggedStackInterpreter ?
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frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
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}
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static int tag_offset_in_bytes() {
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assert(TaggedStackInterpreter, "should not call this");
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return 0;
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}
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// Tagged Locals
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// Locals are stored relative to Llocals:
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//
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// tag <- Llocals[n]
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// value
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//
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// Category 2 types are indexed as:
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//
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// tag <- Llocals[-n]
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// high word
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// tag <- Llocals[-n+1]
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// low word
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//
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// Local values relative to locals[n]
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static int local_offset_in_bytes(int n) {
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return ((frame::interpreter_frame_expression_stack_direction() * n) *
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stackElementSize()) + value_offset_in_bytes();
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}
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static int local_tag_offset_in_bytes(int n) {
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assert(TaggedStackInterpreter, "should not call this");
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return ((frame::interpreter_frame_expression_stack_direction() * n) *
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stackElementSize()) + tag_offset_in_bytes();
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}
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};
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//------------------------------------------------------------------------------------------------------------------------
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// The interpreter generator.
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class Template;
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class AbstractInterpreterGenerator: public StackObj {
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protected:
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InterpreterMacroAssembler* _masm;
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// shared code sequences
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// Converter for native abi result to tosca result
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address generate_result_handler_for(BasicType type);
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address generate_slow_signature_handler();
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// entry point generator
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address generate_method_entry(AbstractInterpreter::MethodKind kind);
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void bang_stack_shadow_pages(bool native_call);
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void generate_all();
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public:
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AbstractInterpreterGenerator(StubQueue* _code);
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};
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