/*
* 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.
*
*/
#include "incls/_precompiled.incl"
#include "incls/_interpreter.cpp.incl"
# define __ _masm->
//------------------------------------------------------------------------------------------------------------------------
// Implementation of InterpreterCodelet
void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) {
_description = description;
_bytecode = bytecode;
}
void InterpreterCodelet::verify() {
}
void InterpreterCodelet::print() {
if (PrintInterpreter) {
tty->cr();
tty->print_cr("----------------------------------------------------------------------");
}
if (description() != NULL) tty->print("%s ", description());
if (bytecode() >= 0 ) tty->print("%d %s ", bytecode(), Bytecodes::name(bytecode()));
tty->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes",
code_begin(), code_end(), code_size());
if (PrintInterpreter) {
tty->cr();
Disassembler::decode(code_begin(), code_end(), tty);
}
}
//------------------------------------------------------------------------------------------------------------------------
// Implementation of platform independent aspects of Interpreter
void AbstractInterpreter::initialize() {
if (_code != NULL) return;
// make sure 'imported' classes are initialized
if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
if (PrintBytecodeHistogram) BytecodeHistogram::reset();
if (PrintBytecodePairHistogram) BytecodePairHistogram::reset();
InvocationCounter::reinitialize(DelayCompilationDuringStartup);
}
void AbstractInterpreter::print() {
tty->cr();
tty->print_cr("----------------------------------------------------------------------");
tty->print_cr("Interpreter");
tty->cr();
tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024);
tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024);
tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024);
tty->cr();
tty->print_cr("# of codelets = %6d" , _code->number_of_stubs());
tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
tty->cr();
_code->print();
tty->print_cr("----------------------------------------------------------------------");
tty->cr();
}
void interpreter_init() {
Interpreter::initialize();
#ifndef PRODUCT
if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure());
#endif // PRODUCT
// need to hit every safepoint in order to call zapping routine
// register the interpreter
VTune::register_stub(
"Interpreter",
AbstractInterpreter::code()->code_start(),
AbstractInterpreter::code()->code_end()
);
Forte::register_stub(
"Interpreter",
AbstractInterpreter::code()->code_start(),
AbstractInterpreter::code()->code_end()
);
// notify JVMTI profiler
if (JvmtiExport::should_post_dynamic_code_generated()) {
JvmtiExport::post_dynamic_code_generated("Interpreter",
AbstractInterpreter::code()->code_start(),
AbstractInterpreter::code()->code_end());
}
}
//------------------------------------------------------------------------------------------------------------------------
// Implementation of interpreter
StubQueue* AbstractInterpreter::_code = NULL;
bool AbstractInterpreter::_notice_safepoints = false;
address AbstractInterpreter::_rethrow_exception_entry = NULL;
address AbstractInterpreter::_native_entry_begin = NULL;
address AbstractInterpreter::_native_entry_end = NULL;
address AbstractInterpreter::_slow_signature_handler;
address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries];
address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers];
//------------------------------------------------------------------------------------------------------------------------
// Generation of complete interpreter
AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
_masm = NULL;
}
static const BasicType types[Interpreter::number_of_result_handlers] = {
T_BOOLEAN,
T_CHAR ,
T_BYTE ,
T_SHORT ,
T_INT ,
T_LONG ,
T_VOID ,
T_FLOAT ,
T_DOUBLE ,
T_OBJECT
};
void AbstractInterpreterGenerator::generate_all() {
{ CodeletMark cm(_masm, "slow signature handler");
Interpreter::_slow_signature_handler = generate_slow_signature_handler();
}
}
//------------------------------------------------------------------------------------------------------------------------
// Entry points
AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
// Abstract method?
if (m->is_abstract()) return abstract;
// Native method?
// Note: This test must come _before_ the test for intrinsic
// methods. See also comments below.
if (m->is_native()) {
return m->is_synchronized() ? native_synchronized : native;
}
// Synchronized?
if (m->is_synchronized()) {
return zerolocals_synchronized;
}
if (RegisterFinalizersAtInit && m->code_size() == 1 &&
m->intrinsic_id() == vmIntrinsics::_Object_init) {
// We need to execute the special return bytecode to check for
// finalizer registration so create a normal frame.
return zerolocals;
}
// Empty method?
if (m->is_empty_method()) {
return empty;
}
// Accessor method?
if (m->is_accessor()) {
assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
return accessor;
}
// Special intrinsic method?
// Note: This test must come _after_ the test for native methods,
// otherwise we will run into problems with JDK 1.2, see also
// AbstractInterpreterGenerator::generate_method_entry() for
// for details.
switch (m->intrinsic_id()) {
case vmIntrinsics::_dsin : return java_lang_math_sin ;
case vmIntrinsics::_dcos : return java_lang_math_cos ;
case vmIntrinsics::_dtan : return java_lang_math_tan ;
case vmIntrinsics::_dabs : return java_lang_math_abs ;
case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
case vmIntrinsics::_dlog : return java_lang_math_log ;
case vmIntrinsics::_dlog10: return java_lang_math_log10;
}
// Note: for now: zero locals for all non-empty methods
return zerolocals;
}
// Return true if the interpreter can prove that the given bytecode has
// not yet been executed (in Java semantics, not in actual operation).
bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
address bcp = method->bcp_from(bci);
if (!Bytecode_at(bcp)->must_rewrite()) {
// might have been reached
return false;
}
// the bytecode might not be rewritten if the method is an accessor, etc.
address ientry = method->interpreter_entry();
if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
return false; // interpreter does not run this method!
// otherwise, we can be sure this bytecode has never been executed
return true;
}
#ifndef PRODUCT
void AbstractInterpreter::print_method_kind(MethodKind kind) {
switch (kind) {
case zerolocals : tty->print("zerolocals" ); break;
case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
case native : tty->print("native" ); break;
case native_synchronized : tty->print("native_synchronized" ); break;
case empty : tty->print("empty" ); break;
case accessor : tty->print("accessor" ); break;
case abstract : tty->print("abstract" ); break;
case java_lang_math_sin : tty->print("java_lang_math_sin" ); break;
case java_lang_math_cos : tty->print("java_lang_math_cos" ); break;
case java_lang_math_tan : tty->print("java_lang_math_tan" ); break;
case java_lang_math_abs : tty->print("java_lang_math_abs" ); break;
case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break;
case java_lang_math_log : tty->print("java_lang_math_log" ); break;
case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break;
default : ShouldNotReachHere();
}
}
#endif // PRODUCT
static BasicType constant_pool_type(methodOop method, int index) {
constantTag tag = method->constants()->tag_at(index);
if (tag.is_int ()) return T_INT;
else if (tag.is_float ()) return T_FLOAT;
else if (tag.is_long ()) return T_LONG;
else if (tag.is_double ()) return T_DOUBLE;
else if (tag.is_string ()) return T_OBJECT;
else if (tag.is_unresolved_string()) return T_OBJECT;
else if (tag.is_klass ()) return T_OBJECT;
else if (tag.is_unresolved_klass ()) return T_OBJECT;
ShouldNotReachHere();
return T_ILLEGAL;
}
//------------------------------------------------------------------------------------------------------------------------
// Deoptimization support
// If deoptimization happens, this method returns the point where to continue in
// interpreter. For calls (invokexxxx, newxxxx) the continuation is at next
// bci and the top of stack is in eax/edx/FPU tos.
// For putfield/getfield, put/getstatic, the continuation is at the same
// bci and the TOS is on stack.
// Note: deopt_entry(type, 0) means reexecute bytecode
// deopt_entry(type, length) means continue at next bytecode
address AbstractInterpreter::continuation_for(methodOop method, address bcp, int callee_parameters, bool is_top_frame, bool& use_next_mdp) {
assert(method->contains(bcp), "just checkin'");
Bytecodes::Code code = Bytecodes::java_code_at(bcp);
int bci = method->bci_from(bcp);
int length = -1; // initial value for debugging
// compute continuation length
length = Bytecodes::length_at(bcp);
// compute result type
BasicType type = T_ILLEGAL;
// when continuing after a compiler safepoint, re-execute the bytecode
// (an invoke is continued after the safepoint)
use_next_mdp = true;
switch (code) {
case Bytecodes::_lookupswitch:
case Bytecodes::_tableswitch:
case Bytecodes::_fast_binaryswitch:
case Bytecodes::_fast_linearswitch:
// recompute condtional expression folded into _if<cond>
case Bytecodes::_lcmp :
case Bytecodes::_fcmpl :
case Bytecodes::_fcmpg :
case Bytecodes::_dcmpl :
case Bytecodes::_dcmpg :
case Bytecodes::_ifnull :
case Bytecodes::_ifnonnull :
case Bytecodes::_goto :
case Bytecodes::_goto_w :
case Bytecodes::_ifeq :
case Bytecodes::_ifne :
case Bytecodes::_iflt :
case Bytecodes::_ifge :
case Bytecodes::_ifgt :
case Bytecodes::_ifle :
case Bytecodes::_if_icmpeq :
case Bytecodes::_if_icmpne :
case Bytecodes::_if_icmplt :
case Bytecodes::_if_icmpge :
case Bytecodes::_if_icmpgt :
case Bytecodes::_if_icmple :
case Bytecodes::_if_acmpeq :
case Bytecodes::_if_acmpne :
// special cases
case Bytecodes::_getfield :
case Bytecodes::_putfield :
case Bytecodes::_getstatic :
case Bytecodes::_putstatic :
case Bytecodes::_aastore :
// reexecute the operation and TOS value is on stack
assert(is_top_frame, "must be top frame");
use_next_mdp = false;
return Interpreter::deopt_entry(vtos, 0);
break;
#ifdef COMPILER1
case Bytecodes::_athrow :
assert(is_top_frame, "must be top frame");
use_next_mdp = false;
return Interpreter::rethrow_exception_entry();
break;
#endif /* COMPILER1 */
case Bytecodes::_invokevirtual :
case Bytecodes::_invokespecial :
case Bytecodes::_invokestatic :
case Bytecodes::_invokeinterface: {
Thread *thread = Thread::current();
ResourceMark rm(thread);
methodHandle mh(thread, method);
type = Bytecode_invoke_at(mh, bci)->result_type(thread);
// since the cache entry might not be initialized:
// (NOT needed for the old calling convension)
if (!is_top_frame) {
int index = Bytes::get_native_u2(bcp+1);
method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
}
break;
}
case Bytecodes::_ldc :
type = constant_pool_type( method, *(bcp+1) );
break;
case Bytecodes::_ldc_w : // fall through
case Bytecodes::_ldc2_w:
type = constant_pool_type( method, Bytes::get_Java_u2(bcp+1) );
break;
default:
type = Bytecodes::result_type(code);
break;
}
// return entry point for computed continuation state & bytecode length
return
is_top_frame
? Interpreter::deopt_entry (as_TosState(type), length)
: Interpreter::return_entry(as_TosState(type), length);
}
void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
// Quick & dirty stack overflow checking: bang the stack & handle trap.
// Note that we do the banging after the frame is setup, since the exception
// handling code expects to find a valid interpreter frame on the stack.
// Doing the banging earlier fails if the caller frame is not an interpreter
// frame.
// (Also, the exception throwing code expects to unlock any synchronized
// method receiever, so do the banging after locking the receiver.)
// Bang each page in the shadow zone. We can't assume it's been done for
// an interpreter frame with greater than a page of locals, so each page
// needs to be checked. Only true for non-native.
if (UseStackBanging) {
const int start_page = native_call ? StackShadowPages : 1;
const int page_size = os::vm_page_size();
for (int pages = start_page; pages <= StackShadowPages ; pages++) {
__ bang_stack_with_offset(pages*page_size);
}
}
}