JDK14/Java14源码在线阅读
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* version 2 for more details (a copy is included in the LICENSE file that
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#include "precompiled.hpp"
#include "asm/macroAssembler.inline.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/bytecodeHistogram.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/interp_masm.hpp"
#include "interpreter/templateInterpreterGenerator.hpp"
#include "interpreter/templateTable.hpp"
#include "oops/arrayOop.hpp"
#include "oops/methodData.hpp"
#include "oops/method.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/arguments.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/timer.hpp"
#include "runtime/vframeArray.hpp"
#include "utilities/align.hpp"
#include "utilities/debug.hpp"
#include "utilities/macros.hpp"
// Size of interpreter code. Increase if too small. Interpreter will
// fail with a guarantee ("not enough space for interpreter generation");
// if too small.
// Run with +PrintInterpreter to get the VM to print out the size.
// Max size with JVMTI
// The sethi() instruction generates lots more instructions when shell
// stack limit is unlimited, so that's why this is much bigger.
int TemplateInterpreter::InterpreterCodeSize = 260 * K;
// Generation of Interpreter
//
// The TemplateInterpreterGenerator generates the interpreter into Interpreter::_code.
#define __ _masm->
//----------------------------------------------------------------------------------------------------
// LP64 passes floating point arguments in F1, F3, F5, etc. instead of
// O0, O1, O2 etc..
// Doubles are passed in D0, D2, D4
// We store the signature of the first 16 arguments in the first argument
// slot because it will be overwritten prior to calling the native
// function, with the pointer to the JNIEnv.
// If LP64 there can be up to 16 floating point arguments in registers
// or 6 integer registers.
address TemplateInterpreterGenerator::generate_slow_signature_handler() {
enum {
non_float = 0,
float_sig = 1,
double_sig = 2,
sig_mask = 3
};
address entry = __ pc();
Argument argv(0, true);
// We are in the jni transition frame. Save the last_java_frame corresponding to the
// outer interpreter frame
//
__ set_last_Java_frame(FP, noreg);
// make sure the interpreter frame we've pushed has a valid return pc
__ mov(O7, I7);
__ mov(Lmethod, G3_scratch);
__ mov(Llocals, G4_scratch);
__ save_frame(0);
__ mov(G2_thread, L7_thread_cache);
__ add(argv.address_in_frame(), O3);
__ mov(G2_thread, O0);
__ mov(G3_scratch, O1);
__ call(CAST_FROM_FN_PTR(address, InterpreterRuntime::slow_signature_handler), relocInfo::runtime_call_type);
__ delayed()->mov(G4_scratch, O2);
__ mov(L7_thread_cache, G2_thread);
__ reset_last_Java_frame();
// load the register arguments (the C code packed them as varargs)
Address Sig = argv.address_in_frame(); // Argument 0 holds the signature
__ ld_ptr( Sig, G3_scratch ); // Get register argument signature word into G3_scratch
__ mov( G3_scratch, G4_scratch);
__ srl( G4_scratch, 2, G4_scratch); // Skip Arg 0
Label done;
for (Argument ldarg = argv.successor(); ldarg.is_float_register(); ldarg = ldarg.successor()) {
Label NonFloatArg;
Label LoadFloatArg;
Label LoadDoubleArg;
Label NextArg;
Address a = ldarg.address_in_frame();
__ andcc(G4_scratch, sig_mask, G3_scratch);
__ br(Assembler::zero, false, Assembler::pt, NonFloatArg);
__ delayed()->nop();
__ cmp(G3_scratch, float_sig );
__ br(Assembler::equal, false, Assembler::pt, LoadFloatArg);
__ delayed()->nop();
__ cmp(G3_scratch, double_sig );
__ br(Assembler::equal, false, Assembler::pt, LoadDoubleArg);
__ delayed()->nop();
__ bind(NonFloatArg);
// There are only 6 integer register arguments!
if ( ldarg.is_register() )
__ ld_ptr(ldarg.address_in_frame(), ldarg.as_register());
else {
// Optimization, see if there are any more args and get out prior to checking
// all 16 float registers. My guess is that this is rare.
// If is_register is false, then we are done the first six integer args.
__ br_null_short(G4_scratch, Assembler::pt, done);
}
__ ba(NextArg);
__ delayed()->srl( G4_scratch, 2, G4_scratch );
__ bind(LoadFloatArg);
__ ldf( FloatRegisterImpl::S, a, ldarg.as_float_register(), 4);
__ ba(NextArg);
__ delayed()->srl( G4_scratch, 2, G4_scratch );
__ bind(LoadDoubleArg);
__ ldf( FloatRegisterImpl::D, a, ldarg.as_double_register() );
__ ba(NextArg);
__ delayed()->srl( G4_scratch, 2, G4_scratch );
__ bind(NextArg);
}
__ bind(done);
__ ret();
__ delayed()->restore(O0, 0, Lscratch); // caller's Lscratch gets the result handler
return entry;
}
void TemplateInterpreterGenerator::generate_counter_overflow(Label& Lcontinue) {
// Generate code to initiate compilation on the counter overflow.
// InterpreterRuntime::frequency_counter_overflow takes two arguments,
// the first indicates if the counter overflow occurs at a backwards branch (NULL bcp)
// and the second is only used when the first is true. We pass zero for both.
// The call returns the address of the verified entry point for the method or NULL
// if the compilation did not complete (either went background or bailed out).
__ set((int)false, O2);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), O2, O2, true);
// returns verified_entry_point or NULL
// we ignore it in any case
__ ba_short(Lcontinue);
}
// End of helpers
// Various method entries
// Abstract method entry
// Attempt to execute abstract method. Throw exception
//
address TemplateInterpreterGenerator::generate_abstract_entry(void) {
address entry = __ pc();
// abstract method entry
// throw exception
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod), G5_method);
// the call_VM checks for exception, so we should never return here.
__ should_not_reach_here();
return entry;
}
void TemplateInterpreterGenerator::save_native_result(void) {
// result potentially in O0/O1: save it across calls
const Address& l_tmp = InterpreterMacroAssembler::l_tmp;
// result potentially in F0/F1: save it across calls
const Address& d_tmp = InterpreterMacroAssembler::d_tmp;
// save and restore any potential method result value around the unlocking operation
__ stf(FloatRegisterImpl::D, F0, d_tmp);
__ stx(O0, l_tmp);
}
void TemplateInterpreterGenerator::restore_native_result(void) {
const Address& l_tmp = InterpreterMacroAssembler::l_tmp;
const Address& d_tmp = InterpreterMacroAssembler::d_tmp;
// Restore any method result value
__ ldf(FloatRegisterImpl::D, d_tmp, F0);
__ ldx(l_tmp, O0);
}
address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
assert(!pass_oop || message == NULL, "either oop or message but not both");
address entry = __ pc();
// expression stack must be empty before entering the VM if an exception happened
__ empty_expression_stack();
// load exception object
__ set((intptr_t)name, G3_scratch);
if (pass_oop) {
__ call_VM(Oexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), G3_scratch, Otos_i);
} else {
__ set((intptr_t)message, G4_scratch);
__ call_VM(Oexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), G3_scratch, G4_scratch);
}
// throw exception
assert(Interpreter::throw_exception_entry() != NULL, "generate it first");
AddressLiteral thrower(Interpreter::throw_exception_entry());
__ jump_to(thrower, G3_scratch);
__ delayed()->nop();
return entry;
}
address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
address entry = __ pc();
// expression stack must be empty before entering the VM if an exception
// happened
__ empty_expression_stack();
// load exception object
__ call_VM(Oexception,
CAST_FROM_FN_PTR(address,
InterpreterRuntime::throw_ClassCastException),
Otos_i);
__ should_not_reach_here();
return entry;
}
address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
address entry = __ pc();
// expression stack must be empty before entering the VM if an exception happened
__ empty_expression_stack();
// Pass the array to create more detailed exceptions.
// convention: expect aberrant index in register G3_scratch, then shuffle the
// index to G4_scratch for the VM call
__ call_VM(Oexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException), G3_scratch, Otos_i);
__ should_not_reach_here();
return entry;
}
address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
address entry = __ pc();
// expression stack must be empty before entering the VM if an exception happened
__ empty_expression_stack();
__ call_VM(Oexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
__ should_not_reach_here();
return entry;
}
address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
address entry = __ pc();
if (state == atos) {
__ profile_return_type(O0, G3_scratch, G1_scratch);
}
// The callee returns with the stack possibly adjusted by adapter transition
// We remove that possible adjustment here.
// All interpreter local registers are untouched. Any result is passed back
// in the O0/O1 or float registers. Before continuing, the arguments must be
// popped from the java expression stack; i.e., Lesp must be adjusted.
__ mov(Llast_SP, SP); // Remove any adapter added stack space.
const Register cache = G3_scratch;
const Register index = G1_scratch;
__ get_cache_and_index_at_bcp(cache, index, 1, index_size);
const Register flags = cache;
__ ld_ptr(cache, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset(), flags);
const Register parameter_size = flags;
__ and3(flags, ConstantPoolCacheEntry::parameter_size_mask, parameter_size); // argument size in words
__ sll(parameter_size, Interpreter::logStackElementSize, parameter_size); // each argument size in bytes
__ add(Lesp, parameter_size, Lesp); // pop arguments
__ check_and_handle_popframe(Gtemp);
__ check_and_handle_earlyret(Gtemp);
__ dispatch_next(state, step);
return entry;
}
address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step, address continuation) {
address entry = __ pc();
__ get_constant_pool_cache(LcpoolCache); // load LcpoolCache
#if INCLUDE_JVMCI
// Check if we need to take lock at entry of synchronized method. This can
// only occur on method entry so emit it only for vtos with step 0.
if (EnableJVMCI && state == vtos && step == 0) {
Label L;
Address pending_monitor_enter_addr(G2_thread, JavaThread::pending_monitorenter_offset());
__ ldbool(pending_monitor_enter_addr, Gtemp); // Load if pending monitor enter
__ cmp_and_br_short(Gtemp, G0, Assembler::equal, Assembler::pn, L);
// Clear flag.
__ stbool(G0, pending_monitor_enter_addr);
// Take lock.
lock_method();
__ bind(L);
} else {
#ifdef ASSERT
if (EnableJVMCI) {
Label L;
Address pending_monitor_enter_addr(G2_thread, JavaThread::pending_monitorenter_offset());
__ ldbool(pending_monitor_enter_addr, Gtemp); // Load if pending monitor enter
__ cmp_and_br_short(Gtemp, G0, Assembler::equal, Assembler::pn, L);
__ stop("unexpected pending monitor in deopt entry");
__ bind(L);
}
#endif
}
#endif
{ Label L;
Address exception_addr(G2_thread, Thread::pending_exception_offset());
__ ld_ptr(exception_addr, Gtemp); // Load pending exception.
__ br_null_short(Gtemp, Assembler::pt, L);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
__ should_not_reach_here();
__ bind(L);
}
if (continuation == NULL) {
__ dispatch_next(state, step);
} else {
__ jump_to_entry(continuation);
}
return entry;
}
// A result handler converts/unboxes a native call result into
// a java interpreter/compiler result. The current frame is an
// interpreter frame. The activation frame unwind code must be
// consistent with that of TemplateTable::_return(...). In the
// case of native methods, the caller's SP was not modified.
address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
address entry = __ pc();
Register Itos_i = Otos_i ->after_save();
Register Itos_l = Otos_l ->after_save();
Register Itos_l1 = Otos_l1->after_save();
Register Itos_l2 = Otos_l2->after_save();
switch (type) {
case T_BOOLEAN: __ subcc(G0, O0, G0); __ addc(G0, 0, Itos_i); break; // !0 => true; 0 => false
case T_CHAR : __ sll(O0, 16, O0); __ srl(O0, 16, Itos_i); break; // cannot use and3, 0xFFFF too big as immediate value!
case T_BYTE : __ sll(O0, 24, O0); __ sra(O0, 24, Itos_i); break;
case T_SHORT : __ sll(O0, 16, O0); __ sra(O0, 16, Itos_i); break;
case T_LONG :
case T_INT : __ mov(O0, Itos_i); break;
case T_VOID : /* nothing to do */ break;
case T_FLOAT : assert(F0 == Ftos_f, "fix this code" ); break;
case T_DOUBLE : assert(F0 == Ftos_d, "fix this code" ); break;
case T_OBJECT :
__ ld_ptr(FP, (frame::interpreter_frame_oop_temp_offset*wordSize) + STACK_BIAS, Itos_i);
__ verify_oop(Itos_i);
break;
default : ShouldNotReachHere();
}
__ ret(); // return from interpreter activation
__ delayed()->restore(I5_savedSP, G0, SP); // remove interpreter frame
NOT_PRODUCT(__ emit_int32(0);) // marker for disassembly
return entry;
}
address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) {
address entry = __ pc();
__ push(state);
__ call_VM(noreg, runtime_entry);
__ dispatch_via(vtos, Interpreter::normal_table(vtos));
return entry;
}
//
// Helpers for commoning out cases in the various type of method entries.
//
// increment invocation count & check for overflow
//
// Note: checking for negative value instead of overflow
// so we have a 'sticky' overflow test
//
// Lmethod: method
// ??: invocation counter
//
void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
// Note: In tiered we increment either counters in MethodCounters* or in
// MDO depending if we're profiling or not.
const Register G3_method_counters = G3_scratch;
Label done;
if (TieredCompilation) {
const int increment = InvocationCounter::count_increment;
Label no_mdo;
if (ProfileInterpreter) {
// If no method data exists, go to profile_continue.
__ ld_ptr(Lmethod, Method::method_data_offset(), G4_scratch);
__ br_null_short(G4_scratch, Assembler::pn, no_mdo);
// Increment counter
Address mdo_invocation_counter(G4_scratch,
in_bytes(MethodData::invocation_counter_offset()) +
in_bytes(InvocationCounter::counter_offset()));
Address mask(G4_scratch, in_bytes(MethodData::invoke_mask_offset()));
__ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
G3_scratch, Lscratch,
Assembler::zero, overflow);
__ ba_short(done);
}
// Increment counter in MethodCounters*
__ bind(no_mdo);
Address invocation_counter(G3_method_counters,
in_bytes(MethodCounters::invocation_counter_offset()) +
in_bytes(InvocationCounter::counter_offset()));
__ get_method_counters(Lmethod, G3_method_counters, done);
Address mask(G3_method_counters, in_bytes(MethodCounters::invoke_mask_offset()));
__ increment_mask_and_jump(invocation_counter, increment, mask,
G4_scratch, Lscratch,
Assembler::zero, overflow);
__ bind(done);
} else { // not TieredCompilation
// Update standard invocation counters
__ get_method_counters(Lmethod, G3_method_counters, done);
__ increment_invocation_counter(G3_method_counters, O0, G4_scratch);
if (ProfileInterpreter) {
Address interpreter_invocation_counter(G3_method_counters,
in_bytes(MethodCounters::interpreter_invocation_counter_offset()));
__ ld(interpreter_invocation_counter, G4_scratch);
__ inc(G4_scratch);
__ st(G4_scratch, interpreter_invocation_counter);
}
if (ProfileInterpreter && profile_method != NULL) {
// Test to see if we should create a method data oop
Address profile_limit(G3_method_counters, in_bytes(MethodCounters::interpreter_profile_limit_offset()));
__ ld(profile_limit, G1_scratch);
__ cmp_and_br_short(O0, G1_scratch, Assembler::lessUnsigned, Assembler::pn, *profile_method_continue);
// if no method data exists, go to profile_method
__ test_method_data_pointer(*profile_method);
}
Address invocation_limit(G3_method_counters, in_bytes(MethodCounters::interpreter_invocation_limit_offset()));
__ ld(invocation_limit, G3_scratch);
__ cmp(O0, G3_scratch);
__ br(Assembler::greaterEqualUnsigned, false, Assembler::pn, *overflow); // Far distance
__ delayed()->nop();
__ bind(done);
}
}
// Allocate monitor and lock method (asm interpreter)
// ebx - Method*
//
void TemplateInterpreterGenerator::lock_method() {
__ ld(Lmethod, in_bytes(Method::access_flags_offset()), O0); // Load access flags.
#ifdef ASSERT
{ Label ok;
__ btst(JVM_ACC_SYNCHRONIZED, O0);
__ br( Assembler::notZero, false, Assembler::pt, ok);
__ delayed()->nop();
__ stop("method doesn't need synchronization");
__ bind(ok);
}
#endif // ASSERT
// get synchronization object to O0
{ Label done;
__ btst(JVM_ACC_STATIC, O0);
__ br( Assembler::zero, true, Assembler::pt, done);
__ delayed()->ld_ptr(Llocals, Interpreter::local_offset_in_bytes(0), O0); // get receiver for not-static case
// lock the mirror, not the Klass*
__ load_mirror(O0, Lmethod, Lscratch);
#ifdef ASSERT
__ tst(O0);
__ breakpoint_trap(Assembler::zero, Assembler::ptr_cc);
#endif // ASSERT
__ bind(done);
}
__ add_monitor_to_stack(true, noreg, noreg); // allocate monitor elem
__ st_ptr( O0, Lmonitors, BasicObjectLock::obj_offset_in_bytes()); // store object
// __ untested("lock_object from method entry");
__ lock_object(Lmonitors, O0);
}
// See if we've got enough room on the stack for locals plus overhead below
// JavaThread::stack_overflow_limit(). If not, throw a StackOverflowError
// without going through the signal handler, i.e., reserved and yellow zones
// will not be made usable. The shadow zone must suffice to handle the
// overflow.
void TemplateInterpreterGenerator::generate_stack_overflow_check(Register Rframe_size,
Register Rscratch) {
const int page_size = os::vm_page_size();
Label after_frame_check;
assert_different_registers(Rframe_size, Rscratch);
__ set(page_size, Rscratch);
__ cmp_and_br_short(Rframe_size, Rscratch, Assembler::lessEqual, Assembler::pt, after_frame_check);
// Get the stack overflow limit, and in debug, verify it is non-zero.
__ ld_ptr(G2_thread, JavaThread::stack_overflow_limit_offset(), Rscratch);
#ifdef ASSERT
Label limit_ok;
__ br_notnull_short(Rscratch, Assembler::pn, limit_ok);
__ stop("stack overflow limit is zero in generate_stack_overflow_check");
__ bind(limit_ok);
#endif
// Add in the size of the frame (which is the same as subtracting it from the
// SP, which would take another register.
__ add(Rscratch, Rframe_size, Rscratch);
// The frame is greater than one page in size, so check against
// the bottom of the stack.
__ cmp_and_brx_short(SP, Rscratch, Assembler::greaterUnsigned, Assembler::pt, after_frame_check);
// The stack will overflow, throw an exception.
// Note that SP is restored to sender's sp (in the delay slot). This
// is necessary if the sender's frame is an extended compiled frame
// (see gen_c2i_adapter()) and safer anyway in case of JSR292
// adaptations.
// Note also that the restored frame is not necessarily interpreted.
// Use the shared runtime version of the StackOverflowError.
assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
__ jump_to(stub, Rscratch);
__ delayed()->mov(O5_savedSP, SP);
// If you get to here, then there is enough stack space.
__ bind(after_frame_check);
}
//
// Generate a fixed interpreter frame. This is identical setup for interpreted
// methods and for native methods hence the shared code.
//----------------------------------------------------------------------------------------------------
// Stack frame layout
//
// When control flow reaches any of the entry types for the interpreter
// the following holds ->
//
// C2 Calling Conventions:
//
// The entry code below assumes that the following registers are set
// when coming in:
// G5_method: holds the Method* of the method to call
// Lesp: points to the TOS of the callers expression stack
// after having pushed all the parameters
//
// The entry code does the following to setup an interpreter frame
// pop parameters from the callers stack by adjusting Lesp
// set O0 to Lesp
// compute X = (max_locals - num_parameters)
// bump SP up by X to accommodate the extra locals
// compute X = max_expression_stack
// + vm_local_words
// + 16 words of register save area
// save frame doing a save sp, -X, sp growing towards lower addresses
// set Lbcp, Lmethod, LcpoolCache
// set Llocals to i0
// set Lmonitors to FP - rounded_vm_local_words
// set Lesp to Lmonitors - 4
//
// The frame has now been setup to do the rest of the entry code
// Try this optimization: Most method entries could live in a
// "one size fits all" stack frame without all the dynamic size
// calculations. It might be profitable to do all this calculation
// statically and approximately for "small enough" methods.
//-----------------------------------------------------------------------------------------------
// C1 Calling conventions
//
// Upon method entry, the following registers are setup:
//
// g2 G2_thread: current thread
// g5 G5_method: method to activate
// g4 Gargs : pointer to last argument
//
//
// Stack:
//
// +---------------+ <--- sp
// | |
// : reg save area :
// | |
// +---------------+ <--- sp + 0x40
// | |
// : extra 7 slots : note: these slots are not really needed for the interpreter (fix later)
// | |
// +---------------+ <--- sp + 0x5c
// | |
// : free :
// | |
// +---------------+ <--- Gargs
// | |
// : arguments :
// | |
// +---------------+
// | |
//
//
//
// AFTER FRAME HAS BEEN SETUP for method interpretation the stack looks like:
//
// +---------------+ <--- sp
// | |
// : reg save area :
// | |
// +---------------+ <--- sp + 0x40
// | |
// : extra 7 slots : note: these slots are not really needed for the interpreter (fix later)
// | |
// +---------------+ <--- sp + 0x5c
// | |
// : :
// | | <--- Lesp
// +---------------+ <--- Lmonitors (fp - 0x18)
// | VM locals |
// +---------------+ <--- fp
// | |
// : reg save area :
// | |
// +---------------+ <--- fp + 0x40
// | |
// : extra 7 slots : note: these slots are not really needed for the interpreter (fix later)
// | |
// +---------------+ <--- fp + 0x5c
// | |
// : free :
// | |
// +---------------+
// | |
// : nonarg locals :
// | |
// +---------------+
// | |
// : arguments :
// | | <--- Llocals
// +---------------+ <--- Gargs
// | |
void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
//
//
// The entry code sets up a new interpreter frame in 4 steps:
//
// 1) Increase caller's SP by for the extra local space needed:
// (check for overflow)
// Efficient implementation of xload/xstore bytecodes requires
// that arguments and non-argument locals are in a contiguously
// addressable memory block => non-argument locals must be
// allocated in the caller's frame.
//
// 2) Create a new stack frame and register window:
// The new stack frame must provide space for the standard
// register save area, the maximum java expression stack size,
// the monitor slots (0 slots initially), and some frame local
// scratch locations.
//
// 3) The following interpreter activation registers must be setup:
// Lesp : expression stack pointer
// Lbcp : bytecode pointer
// Lmethod : method
// Llocals : locals pointer
// Lmonitors : monitor pointer
// LcpoolCache: constant pool cache
//
// 4) Initialize the non-argument locals if necessary:
// Non-argument locals may need to be initialized to NULL
// for GC to work. If the oop-map information is accurate
// (in the absence of the JSR problem), no initialization
// is necessary.
//
// (gri - 2/25/2000)
int rounded_vm_local_words = align_up((int)frame::interpreter_frame_vm_local_words, WordsPerLong );
const int extra_space =
rounded_vm_local_words + // frame local scratch space
Method::extra_stack_entries() + // extra stack for jsr 292
frame::memory_parameter_word_sp_offset + // register save area
(native_call ? frame::interpreter_frame_extra_outgoing_argument_words : 0);
const Register Glocals_size = G3;
const Register RconstMethod = Glocals_size;
const Register Otmp1 = O3;
const Register Otmp2 = O4;
// Lscratch can't be used as a temporary because the call_stub uses
// it to assert that the stack frame was setup correctly.
const Address constMethod (G5_method, Method::const_offset());
const Address size_of_parameters(RconstMethod, ConstMethod::size_of_parameters_offset());
__ ld_ptr( constMethod, RconstMethod );
__ lduh( size_of_parameters, Glocals_size);
// Gargs points to first local + BytesPerWord
// Set the saved SP after the register window save
//
assert_different_registers(Gargs, Glocals_size, Gframe_size, O5_savedSP);
__ sll(Glocals_size, Interpreter::logStackElementSize, Otmp1);
__ add(Gargs, Otmp1, Gargs);
if (native_call) {
__ calc_mem_param_words( Glocals_size, Gframe_size );
__ add( Gframe_size, extra_space, Gframe_size);
__ round_to( Gframe_size, WordsPerLong );
__ sll( Gframe_size, LogBytesPerWord, Gframe_size );
// Native calls don't need the stack size check since they have no
// expression stack and the arguments are already on the stack and
// we only add a handful of words to the stack.
} else {
//
// Compute number of locals in method apart from incoming parameters
//
const Address size_of_locals(Otmp1, ConstMethod::size_of_locals_offset());
__ ld_ptr(constMethod, Otmp1);
__ lduh(size_of_locals, Otmp1);
__ sub(Otmp1, Glocals_size, Glocals_size);
__ round_to(Glocals_size, WordsPerLong);
__ sll(Glocals_size, Interpreter::logStackElementSize, Glocals_size);
// See if the frame is greater than one page in size. If so,
// then we need to verify there is enough stack space remaining.
// Frame_size = (max_stack + extra_space) * BytesPerWord;
__ ld_ptr(constMethod, Gframe_size);
__ lduh(Gframe_size, in_bytes(ConstMethod::max_stack_offset()), Gframe_size);
__ add(Gframe_size, extra_space, Gframe_size);
__ round_to(Gframe_size, WordsPerLong);
__ sll(Gframe_size, Interpreter::logStackElementSize, Gframe_size);
// Add in java locals size for stack overflow check only
__ add(Gframe_size, Glocals_size, Gframe_size);
const Register Otmp2 = O4;
assert_different_registers(Otmp1, Otmp2, O5_savedSP);
generate_stack_overflow_check(Gframe_size, Otmp1);
__ sub(Gframe_size, Glocals_size, Gframe_size);
//
// bump SP to accommodate the extra locals
//
__ sub(SP, Glocals_size, SP);
}
//
// now set up a stack frame with the size computed above
//
__ neg( Gframe_size );
__ save( SP, Gframe_size, SP );
//
// now set up all the local cache registers
//
// NOTE: At this point, Lbyte_code/Lscratch has been modified. Note
// that all present references to Lbyte_code initialize the register
// immediately before use
if (native_call) {
__ mov(G0, Lbcp);
} else {
__ ld_ptr(G5_method, Method::const_offset(), Lbcp);
__ add(Lbcp, in_bytes(ConstMethod::codes_offset()), Lbcp);
}
__ mov( G5_method, Lmethod); // set Lmethod
// Get mirror and store it in the frame as GC root for this Method*
Register mirror = LcpoolCache;
__ load_mirror(mirror, Lmethod, Lscratch);
__ st_ptr(mirror, FP, (frame::interpreter_frame_mirror_offset * wordSize) + STACK_BIAS);
__ get_constant_pool_cache(LcpoolCache); // set LcpoolCache
__ sub(FP, rounded_vm_local_words * BytesPerWord, Lmonitors ); // set Lmonitors
__ add(Lmonitors, STACK_BIAS, Lmonitors); // Account for 64 bit stack bias
__ sub(Lmonitors, BytesPerWord, Lesp); // set Lesp
// setup interpreter activation registers
__ sub(Gargs, BytesPerWord, Llocals); // set Llocals
if (ProfileInterpreter) {
__ set_method_data_pointer();
}
}
// Method entry for java.lang.ref.Reference.get.
address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
// Code: _aload_0, _getfield, _areturn
// parameter size = 1
//
// The code that gets generated by this routine is split into 2 parts:
// 1. The "intrinsified" code performing an ON_WEAK_OOP_REF load,
// 2. The slow path - which is an expansion of the regular method entry.
//
// Notes:-
// * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
// * We may jump to the slow path iff the receiver is null. If the
// Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
// Thus we can use the regular method entry code to generate the NPE.
//
// This code is based on generate_accessor_enty.
address entry = __ pc();
const int referent_offset = java_lang_ref_Reference::referent_offset;
guarantee(referent_offset > 0, "referent offset not initialized");
Label slow_path;
// In the G1 code we don't check if we need to reach a safepoint. We
// continue and the thread will safepoint at the next bytecode dispatch.
// Check if local 0 != NULL
// If the receiver is null then it is OK to jump to the slow path.
__ ld_ptr(Gargs, G0, Otos_i ); // get local 0
// check if local 0 == NULL and go the slow path
__ cmp_and_brx_short(Otos_i, 0, Assembler::equal, Assembler::pn, slow_path);
__ load_heap_oop(Otos_i, referent_offset, Otos_i, G3_scratch, ON_WEAK_OOP_REF);
// _areturn
__ retl(); // return from leaf routine
__ delayed()->mov(O5_savedSP, SP);
// Generate regular method entry
__ bind(slow_path);
__ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
return entry;
}
/**
* Method entry for static native methods:
* int java.util.zip.CRC32.update(int crc, int b)
*/
address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
if (UseCRC32Intrinsics) {
address entry = __ pc();
Label L_slow_path;
// If we need a safepoint check, generate full interpreter entry.
__ safepoint_poll(L_slow_path, false, G2_thread, O2);
__ delayed()->nop();
// Load parameters
const Register crc = O0; // initial crc
const Register val = O1; // byte to update with
const Register table = O2; // address of 256-entry lookup table
__ ldub(Gargs, 3, val);
__ lduw(Gargs, 8, crc);
__ set(ExternalAddress(StubRoutines::crc_table_addr()), table);
__ not1(crc); // ~crc
__ clruwu(crc);
__ update_byte_crc32(crc, val, table);
__ not1(crc); // ~crc
// result in O0
__ retl();
__ delayed()->nop();
// generate a vanilla native entry as the slow path
__ bind(L_slow_path);
__ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
return entry;
}
return NULL;
}
/**
* Method entry for static native methods:
* int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)
* int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)
*/
address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
if (UseCRC32Intrinsics) {
address entry = __ pc();
Label L_slow_path;
// If we need a safepoint check, generate full interpreter entry.
__ safepoint_poll(L_slow_path, false, G2_thread, O2);
__ delayed()->nop();
// Load parameters from the stack
const Register crc = O0; // initial crc
const Register buf = O1; // source java byte array address
const Register len = O2; // len
const Register offset = O3; // offset
// Arguments are reversed on java expression stack
// Calculate address of start element
if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) {
__ lduw(Gargs, 0, len);
__ lduw(Gargs, 8, offset);
__ ldx( Gargs, 16, buf);
__ lduw(Gargs, 32, crc);
__ add(buf, offset, buf);
} else {
__ lduw(Gargs, 0, len);
__ lduw(Gargs, 8, offset);
__ ldx( Gargs, 16, buf);
__ lduw(Gargs, 24, crc);
__ add(buf, arrayOopDesc::base_offset_in_bytes(T_BYTE), buf); // account for the header size
__ add(buf, offset, buf);
}
// Call the crc32 kernel
__ MacroAssembler::save_thread(L7_thread_cache);
__ kernel_crc32(crc, buf, len, O3);
__ MacroAssembler::restore_thread(L7_thread_cache);
// result in O0
__ retl();
__ delayed()->nop();
// generate a vanilla native entry as the slow path
__ bind(L_slow_path);
__ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native));
return entry;
}
return NULL;
}
/**
* Method entry for intrinsic-candidate (non-native) methods:
* int java.util.zip.CRC32C.updateBytes(int crc, byte[] b, int off, int end)
* int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long buf, int off, int end)
* Unlike CRC32, CRC32C does not have any methods marked as native
* CRC32C also uses an "end" variable instead of the length variable CRC32 uses
*/
address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
if (UseCRC32CIntrinsics) {
address entry = __ pc();
// Load parameters from the stack
const Register crc = O0; // initial crc
const Register buf = O1; // source java byte array address
const Register offset = O2; // offset
const Register end = O3; // index of last element to process
const Register len = O2; // len argument to the kernel
const Register table = O3; // crc32c lookup table address
// Arguments are reversed on java expression stack
// Calculate address of start element
if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) {
__ lduw(Gargs, 0, end);
__ lduw(Gargs, 8, offset);
__ ldx( Gargs, 16, buf);
__ lduw(Gargs, 32, crc);
__ add(buf, offset, buf);
__ sub(end, offset, len);
} else {
__ lduw(Gargs, 0, end);
__ lduw(Gargs, 8, offset);
__ ldx( Gargs, 16, buf);
__ lduw(Gargs, 24, crc);
__ add(buf, arrayOopDesc::base_offset_in_bytes(T_BYTE), buf); // account for the header size
__ add(buf, offset, buf);
__ sub(end, offset, len);
}
// Call the crc32c kernel
__ MacroAssembler::save_thread(L7_thread_cache);
__ kernel_crc32c(crc, buf, len, table);
__ MacroAssembler::restore_thread(L7_thread_cache);
// result in O0
__ retl();
__ delayed()->nop();
return entry;
}
return NULL;
}
/* Math routines only partially supported.
*
* Providing support for fma (float/double) only.
*/
address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind)
{
if (!InlineIntrinsics) return NULL; // Generate a vanilla entry
address entry = __ pc();
switch (kind) {
case Interpreter::java_lang_math_fmaF:
if (UseFMA) {
// float .fma(float a, float b, float c)
const FloatRegister ra = F1;
const FloatRegister rb = F2;
const FloatRegister rc = F3;
const FloatRegister rd = F0; // Result.
__ ldf(FloatRegisterImpl::S, Gargs, 0, rc);
__ ldf(FloatRegisterImpl::S, Gargs, 8, rb);
__ ldf(FloatRegisterImpl::S, Gargs, 16, ra);
__ fmadd(FloatRegisterImpl::S, ra, rb, rc, rd);
__ retl(); // Result in F0 (rd).
__ delayed()->mov(O5_savedSP, SP);
return entry;
}
break;
case Interpreter::java_lang_math_fmaD:
if (UseFMA) {
// double .fma(double a, double b, double c)
const FloatRegister ra = F2; // D1
const FloatRegister rb = F4; // D2
const FloatRegister rc = F6; // D3
const FloatRegister rd = F0; // D0 Result.
__ ldf(FloatRegisterImpl::D, Gargs, 0, rc);
__ ldf(FloatRegisterImpl::D, Gargs, 16, rb);
__ ldf(FloatRegisterImpl::D, Gargs, 32, ra);
__ fmadd(FloatRegisterImpl::D, ra, rb, rc, rd);
__ retl(); // Result in D0 (rd).
__ delayed()->mov(O5_savedSP, SP);
return entry;
}
break;
default:
break;
}
return NULL;
}
// TODO: rather than touching all pages, check against stack_overflow_limit and bang yellow page to
// generate exception
void TemplateInterpreterGenerator::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 receiver, 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 page_size = os::vm_page_size();
const int n_shadow_pages = ((int)JavaThread::stack_shadow_zone_size()) / page_size;
const int start_page = native_call ? n_shadow_pages : 1;
for (int pages = start_page; pages <= n_shadow_pages; pages++) {
__ bang_stack_with_offset(pages*page_size);
}
}
}
//
// Interpreter stub for calling a native method. (asm interpreter)
// This sets up a somewhat different looking stack for calling the native method
// than the typical interpreter frame setup.
//
address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
address entry = __ pc();
// the following temporary registers are used during frame creation
const Register Gtmp1 = G3_scratch ;
const Register Gtmp2 = G1_scratch;
bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
// make sure registers are different!
assert_different_registers(G2_thread, G5_method, Gargs, Gtmp1, Gtmp2);
const Address Laccess_flags(Lmethod, Method::access_flags_offset());
const Register Glocals_size = G3;
assert_different_registers(Glocals_size, G4_scratch, Gframe_size);
// make sure method is native & not abstract
// rethink these assertions - they can be simplified and shared (gri 2/25/2000)
#ifdef ASSERT
__ ld(G5_method, Method::access_flags_offset(), Gtmp1);
{ Label L;
__ btst(JVM_ACC_NATIVE, Gtmp1);
__ br(Assembler::notZero, false, Assembler::pt, L);
__ delayed()->nop();
__ stop("tried to execute non-native method as native");
__ bind(L);
}
{ Label L;
__ btst(JVM_ACC_ABSTRACT, Gtmp1);
__ br(Assembler::zero, false, Assembler::pt, L);
__ delayed()->nop();
__ stop("tried to execute abstract method as non-abstract");
__ bind(L);
}
#endif // ASSERT
// generate the code to allocate the interpreter stack frame
generate_fixed_frame(true);
//
// No locals to initialize for native method
//
// this slot will be set later, we initialize it to null here just in
// case we get a GC before the actual value is stored later
__ st_ptr(G0, FP, (frame::interpreter_frame_oop_temp_offset * wordSize) + STACK_BIAS);
const Address do_not_unlock_if_synchronized(G2_thread,
JavaThread::do_not_unlock_if_synchronized_offset());
// Since at this point in the method invocation the exception handler
// would try to exit the monitor of synchronized methods which hasn't
// been entered yet, we set the thread local variable
// _do_not_unlock_if_synchronized to true. If any exception was thrown by
// runtime, exception handling i.e. unlock_if_synchronized_method will
// check this thread local flag.
// This flag has two effects, one is to force an unwind in the topmost
// interpreter frame and not perform an unlock while doing so.
__ movbool(true, G3_scratch);
__ stbool(G3_scratch, do_not_unlock_if_synchronized);
// increment invocation counter and check for overflow
//
// Note: checking for negative value instead of overflow
// so we have a 'sticky' overflow test (may be of
// importance as soon as we have true MT/MP)
Label invocation_counter_overflow;
Label Lcontinue;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
}
__ bind(Lcontinue);
bang_stack_shadow_pages(true);
// reset the _do_not_unlock_if_synchronized flag
__ stbool(G0, do_not_unlock_if_synchronized);
// check for synchronized methods
// Must happen AFTER invocation_counter check and stack overflow check,
// so method is not locked if overflows.
if (synchronized) {
lock_method();
} else {
#ifdef ASSERT
{ Label ok;
__ ld(Laccess_flags, O0);
__ btst(JVM_ACC_SYNCHRONIZED, O0);
__ br( Assembler::zero, false, Assembler::pt, ok);
__ delayed()->nop();
__ stop("method needs synchronization");
__ bind(ok);
}
#endif // ASSERT
}
// start execution
__ verify_thread();
// JVMTI support
__ notify_method_entry();
// native call
// (note that O0 is never an oop--at most it is a handle)
// It is important not to smash any handles created by this call,
// until any oop handle in O0 is dereferenced.
// (note that the space for outgoing params is preallocated)
// get signature handler
{ Label L;
Address signature_handler(Lmethod, Method::signature_handler_offset());
__ ld_ptr(signature_handler, G3_scratch);
__ br_notnull_short(G3_scratch, Assembler::pt, L);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), Lmethod);
__ ld_ptr(signature_handler, G3_scratch);
__ bind(L);
}
// Push a new frame so that the args will really be stored in
// Copy a few locals across so the new frame has the variables
// we need but these values will be dead at the jni call and
// therefore not gc volatile like the values in the current
// frame (Lmethod in particular)
// Flush the method pointer to the register save area
__ st_ptr(Lmethod, SP, (Lmethod->sp_offset_in_saved_window() * wordSize) + STACK_BIAS);
__ mov(Llocals, O1);
// calculate where the mirror handle body is allocated in the interpreter frame:
__ add(FP, (frame::interpreter_frame_oop_temp_offset * wordSize) + STACK_BIAS, O2);
// Calculate current frame size
__ sub(SP, FP, O3); // Calculate negative of current frame size
__ save(SP, O3, SP); // Allocate an identical sized frame
// Note I7 has leftover trash. Slow signature handler will fill it in
// should we get there. Normal jni call will set reasonable last_Java_pc
// below (and fix I7 so the stack trace doesn't have a meaningless frame
// in it).
// Load interpreter frame's Lmethod into same register here
__ ld_ptr(FP, (Lmethod->sp_offset_in_saved_window() * wordSize) + STACK_BIAS, Lmethod);
__ mov(I1, Llocals);
__ mov(I2, Lscratch2); // save the address of the mirror
// ONLY Lmethod and Llocals are valid here!
// call signature handler, It will move the arg properly since Llocals in current frame
// matches that in outer frame
__ callr(G3_scratch, 0);
__ delayed()->nop();
// Result handler is in Lscratch
// Reload interpreter frame's Lmethod since slow signature handler may block
__ ld_ptr(FP, (Lmethod->sp_offset_in_saved_window() * wordSize) + STACK_BIAS, Lmethod);
{ Label not_static;
__ ld(Laccess_flags, O0);
__ btst(JVM_ACC_STATIC, O0);
__ br( Assembler::zero, false, Assembler::pt, not_static);
// get native function entry point(O0 is a good temp until the very end)
__ delayed()->ld_ptr(Lmethod, in_bytes(Method::native_function_offset()), O0);
// for static methods insert the mirror argument
__ load_mirror(O1, Lmethod, G3_scratch);
#ifdef ASSERT
if (!PrintSignatureHandlers) // do not dirty the output with this
{ Label L;
__ br_notnull_short(O1, Assembler::pt, L);
__ stop("mirror is missing");
__ bind(L);
}
#endif // ASSERT
__ st_ptr(O1, Lscratch2, 0);
__ mov(Lscratch2, O1);
__ bind(not_static);
}
// At this point, arguments have been copied off of stack into
// their JNI positions, which are O1..O5 and SP[68..].
// Oops are boxed in-place on the stack, with handles copied to arguments.
// The result handler is in Lscratch. O0 will shortly hold the JNIEnv*.
#ifdef ASSERT
{ Label L;
__ br_notnull_short(O0, Assembler::pt, L);
__ stop("native entry point is missing");
__ bind(L);
}
#endif // ASSERT
//
// setup the frame anchor
//
// The scavenge function only needs to know that the PC of this frame is
// in the interpreter method entry code, it doesn't need to know the exact
// PC and hence we can use O7 which points to the return address from the
// previous call in the code stream (signature handler function)
//
// The other trick is we set last_Java_sp to FP instead of the usual SP because
// we have pushed the extra frame in order to protect the volatile register(s)
// in that frame when we return from the jni call
//
__ set_last_Java_frame(FP, O7);
__ mov(O7, I7); // make dummy interpreter frame look like one above,
// not meaningless information that'll confuse me.
// flush the windows now. We don't care about the current (protection) frame
// only the outer frames
__ flushw();
// mark windows as flushed
Address flags(G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::flags_offset());
__ set(JavaFrameAnchor::flushed, G3_scratch);
__ st(G3_scratch, flags);
// Transition from _thread_in_Java to _thread_in_native. We are already safepoint ready.
Address thread_state(G2_thread, JavaThread::thread_state_offset());
#ifdef ASSERT
{ Label L;
__ ld(thread_state, G3_scratch);
__ cmp_and_br_short(G3_scratch, _thread_in_Java, Assembler::equal, Assembler::pt, L);
__ stop("Wrong thread state in native stub");
__ bind(L);
}
#endif // ASSERT
__ set(_thread_in_native, G3_scratch);
__ st(G3_scratch, thread_state);
// Call the jni method, using the delay slot to set the JNIEnv* argument.
__ save_thread(L7_thread_cache); // save Gthread
__ callr(O0, 0);
__ delayed()->
add(L7_thread_cache, in_bytes(JavaThread::jni_environment_offset()), O0);
// Back from jni method Lmethod in this frame is DEAD, DEAD, DEAD
__ restore_thread(L7_thread_cache); // restore G2_thread
__ reinit_heapbase();
// must we block?
// Block, if necessary, before resuming in _thread_in_Java state.
// In order for GC to work, don't clear the last_Java_sp until after blocking.
{ Label no_block;
// Switch thread to "native transition" state before reading the synchronization state.
// This additional state is necessary because reading and testing the synchronization
// state is not atomic w.r.t. GC, as this scenario demonstrates:
// Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
// VM thread changes sync state to synchronizing and suspends threads for GC.
// Thread A is resumed to finish this native method, but doesn't block here since it
// didn't see any synchronization is progress, and escapes.
__ set(_thread_in_native_trans, G3_scratch);
__ st(G3_scratch, thread_state);
// Force this write out before the read below
__ membar(Assembler::StoreLoad);
Label L;
__ safepoint_poll(L, false, G2_thread, G3_scratch);
__ delayed()->ld(G2_thread, JavaThread::suspend_flags_offset(), G3_scratch);
__ cmp_and_br_short(G3_scratch, 0, Assembler::equal, Assembler::pt, no_block);
__ bind(L);
// Block. Save any potential method result value before the operation and
// use a leaf call to leave the last_Java_frame setup undisturbed.
save_native_result();
__ call_VM_leaf(L7_thread_cache,
CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans),
G2_thread);
// Restore any method result value
restore_native_result();
__ bind(no_block);
}
// Clear the frame anchor now
__ reset_last_Java_frame();
// Move the result handler address
__ mov(Lscratch, G3_scratch);
// return possible result to the outer frame
__ restore(O0, G0, O0);
// Move result handler to expected register
__ mov(G3_scratch, Lscratch);
// Back in normal (native) interpreter frame. State is thread_in_native_trans
// switch to thread_in_Java.
__ set(_thread_in_Java, G3_scratch);
__ st(G3_scratch, thread_state);
if (CheckJNICalls) {
// clear_pending_jni_exception_check
__ st_ptr(G0, G2_thread, JavaThread::pending_jni_exception_check_fn_offset());
}
// reset handle block
__ ld_ptr(G2_thread, JavaThread::active_handles_offset(), G3_scratch);
__ st(G0, G3_scratch, JNIHandleBlock::top_offset_in_bytes());
// If we have an oop result store it where it will be safe for any further gc
// until we return now that we've released the handle it might be protected by
{ Label no_oop;
__ set((intptr_t)AbstractInterpreter::result_handler(T_OBJECT), G3_scratch);
__ cmp_and_brx_short(G3_scratch, Lscratch, Assembler::notEqual, Assembler::pt, no_oop);
__ resolve_jobject(O0, G3_scratch);
// Store it where gc will look for it and result handler expects it.
__ st_ptr(O0, FP, (frame::interpreter_frame_oop_temp_offset*wordSize) + STACK_BIAS);
__ bind(no_oop);
}
// handle exceptions (exception handling will handle unlocking!)
{ Label L;
Address exception_addr(G2_thread, Thread::pending_exception_offset());
__ ld_ptr(exception_addr, Gtemp);
__ br_null_short(Gtemp, Assembler::pt, L);
// Note: This could be handled more efficiently since we know that the native
// method doesn't have an exception handler. We could directly return
// to the exception handler for the caller.
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
__ should_not_reach_here();
__ bind(L);
}
// JVMTI support (preserves thread register)
__ notify_method_exit(true, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
if (synchronized) {
// save and restore any potential method result value around the unlocking operation
save_native_result();
__ add( __ top_most_monitor(), O1);
__ unlock_object(O1);
restore_native_result();
}
// dispose of return address and remove activation
#ifdef ASSERT
{ Label ok;
__ cmp_and_brx_short(I5_savedSP, FP, Assembler::greaterEqualUnsigned, Assembler::pt, ok);
__ stop("bad I5_savedSP value");
__ should_not_reach_here();
__ bind(ok);
}
#endif
__ jmp(Lscratch, 0);
__ delayed()->nop();
if (inc_counter) {
// handle invocation counter overflow
__ bind(invocation_counter_overflow);
generate_counter_overflow(Lcontinue);
}
return entry;
}
// Generic method entry to (asm) interpreter
address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
address entry = __ pc();
bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
// the following temporary registers are used during frame creation
const Register Gtmp1 = G3_scratch ;
const Register Gtmp2 = G1_scratch;
// make sure registers are different!
assert_different_registers(G2_thread, G5_method, Gargs, Gtmp1, Gtmp2);
const Address constMethod (G5_method, Method::const_offset());
// Seems like G5_method is live at the point this is used. So we could make this look consistent
// and use in the asserts.
const Address access_flags (Lmethod, Method::access_flags_offset());
const Register Glocals_size = G3;
assert_different_registers(Glocals_size, G4_scratch, Gframe_size);
// make sure method is not native & not abstract
// rethink these assertions - they can be simplified and shared (gri 2/25/2000)
#ifdef ASSERT
__ ld(G5_method, Method::access_flags_offset(), Gtmp1);
{ Label L;
__ btst(JVM_ACC_NATIVE, Gtmp1);
__ br(Assembler::zero, false, Assembler::pt, L);
__ delayed()->nop();
__ stop("tried to execute native method as non-native");
__ bind(L);
}
{ Label L;
__ btst(JVM_ACC_ABSTRACT, Gtmp1);
__ br(Assembler::zero, false, Assembler::pt, L);
__ delayed()->nop();
__ stop("tried to execute abstract method as non-abstract");
__ bind(L);
}
#endif // ASSERT
// generate the code to allocate the interpreter stack frame
generate_fixed_frame(false);
//
// Code to initialize the extra (i.e. non-parm) locals
//
Register init_value = noreg; // will be G0 if we must clear locals
// The way the code was setup before zerolocals was always true for vanilla java entries.
// It could only be false for the specialized entries like accessor or empty which have
// no extra locals so the testing was a waste of time and the extra locals were always
// initialized. We removed this extra complication to already over complicated code.
init_value = G0;
Label clear_loop;
const Register RconstMethod = O1;
const Address size_of_parameters(RconstMethod, ConstMethod::size_of_parameters_offset());
const Address size_of_locals (RconstMethod, ConstMethod::size_of_locals_offset());
// NOTE: If you change the frame layout, this code will need to
// be updated!
__ ld_ptr( constMethod, RconstMethod );
__ lduh( size_of_locals, O2 );
__ lduh( size_of_parameters, O1 );
__ sll( O2, Interpreter::logStackElementSize, O2);
__ sll( O1, Interpreter::logStackElementSize, O1 );
__ sub( Llocals, O2, O2 );
__ sub( Llocals, O1, O1 );
__ bind( clear_loop );
__ inc( O2, wordSize );
__ cmp( O2, O1 );
__ brx( Assembler::lessEqualUnsigned, true, Assembler::pt, clear_loop );
__ delayed()->st_ptr( init_value, O2, 0 );
const Address do_not_unlock_if_synchronized(G2_thread,
JavaThread::do_not_unlock_if_synchronized_offset());
// Since at this point in the method invocation the exception handler
// would try to exit the monitor of synchronized methods which hasn't
// been entered yet, we set the thread local variable
// _do_not_unlock_if_synchronized to true. If any exception was thrown by
// runtime, exception handling i.e. unlock_if_synchronized_method will
// check this thread local flag.
__ movbool(true, G3_scratch);
__ stbool(G3_scratch, do_not_unlock_if_synchronized);
__ profile_parameters_type(G1_scratch, G3_scratch, G4_scratch, Lscratch);
// increment invocation counter and check for overflow
//
// Note: checking for negative value instead of overflow
// so we have a 'sticky' overflow test (may be of
// importance as soon as we have true MT/MP)
Label invocation_counter_overflow;
Label profile_method;
Label profile_method_continue;
Label Lcontinue;
if (inc_counter) {
generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
if (ProfileInterpreter) {
__ bind(profile_method_continue);
}
}
__ bind(Lcontinue);
bang_stack_shadow_pages(false);
// reset the _do_not_unlock_if_synchronized flag
__ stbool(G0, do_not_unlock_if_synchronized);
// check for synchronized methods
// Must happen AFTER invocation_counter check and stack overflow check,
// so method is not locked if overflows.
if (synchronized) {
lock_method();
} else {
#ifdef ASSERT
{ Label ok;
__ ld(access_flags, O0);
__ btst(JVM_ACC_SYNCHRONIZED, O0);
__ br( Assembler::zero, false, Assembler::pt, ok);
__ delayed()->nop();
__ stop("method needs synchronization");
__ bind(ok);
}
#endif // ASSERT
}
// start execution
__ verify_thread();
// jvmti support
__ notify_method_entry();
// start executing instructions
__ dispatch_next(vtos);
if (inc_counter) {
if (ProfileInterpreter) {
// We have decided to profile this method in the interpreter
__ bind(profile_method);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
__ set_method_data_pointer_for_bcp();
__ ba_short(profile_method_continue);
}
// handle invocation counter overflow
__ bind(invocation_counter_overflow);
generate_counter_overflow(Lcontinue);
}
return entry;
}
//----------------------------------------------------------------------------------------------------
// Exceptions
void TemplateInterpreterGenerator::generate_throw_exception() {
// Entry point in previous activation (i.e., if the caller was interpreted)
Interpreter::_rethrow_exception_entry = __ pc();
// O0: exception
// entry point for exceptions thrown within interpreter code
Interpreter::_throw_exception_entry = __ pc();
__ verify_thread();
// expression stack is undefined here
// O0: exception, i.e. Oexception
// Lbcp: exception bcp
__ verify_oop(Oexception);
// expression stack must be empty before entering the VM in case of an exception
__ empty_expression_stack();
// find exception handler address and preserve exception oop
// call C routine to find handler and jump to it
__ call_VM(O1, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), Oexception);
__ push_ptr(O1); // push exception for exception handler bytecodes
__ JMP(O0, 0); // jump to exception handler (may be remove activation entry!)
__ delayed()->nop();
// if the exception is not handled in the current frame
// the frame is removed and the exception is rethrown
// (i.e. exception continuation is _rethrow_exception)
//
// Note: At this point the bci is still the bxi for the instruction which caused
// the exception and the expression stack is empty. Thus, for any VM calls
// at this point, GC will find a legal oop map (with empty expression stack).
// in current activation
// tos: exception
// Lbcp: exception bcp
//
// JVMTI PopFrame support
//
Interpreter::_remove_activation_preserving_args_entry = __ pc();
Address popframe_condition_addr(G2_thread, JavaThread::popframe_condition_offset());
// Set the popframe_processing bit in popframe_condition indicating that we are
// currently handling popframe, so that call_VMs that may happen later do not trigger new
// popframe handling cycles.
__ ld(popframe_condition_addr, G3_scratch);
__ or3(G3_scratch, JavaThread::popframe_processing_bit, G3_scratch);
__ stw(G3_scratch, popframe_condition_addr);
// Empty the expression stack, as in normal exception handling
__ empty_expression_stack();
__ unlock_if_synchronized_method(vtos, /* throw_monitor_exception */ false, /* install_monitor_exception */ false);
{
// Check to see whether we are returning to a deoptimized frame.
// (The PopFrame call ensures that the caller of the popped frame is
// either interpreted or compiled and deoptimizes it if compiled.)
// In this case, we can't call dispatch_next() after the frame is
// popped, but instead must save the incoming arguments and restore
// them after deoptimization has occurred.
//
// Note that we don't compare the return PC against the
// deoptimization blob's unpack entry because of the presence of
// adapter frames in C2.
Label caller_not_deoptimized;
__ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), I7);
__ br_notnull_short(O0, Assembler::pt, caller_not_deoptimized);
const Register Gtmp1 = G3_scratch;
const Register Gtmp2 = G1_scratch;
const Register RconstMethod = Gtmp1;
const Address constMethod(Lmethod, Method::const_offset());
const Address size_of_parameters(RconstMethod, ConstMethod::size_of_parameters_offset());
// Compute size of arguments for saving when returning to deoptimized caller
__ ld_ptr(constMethod, RconstMethod);
__ lduh(size_of_parameters, Gtmp1);
__ sll(Gtmp1, Interpreter::logStackElementSize, Gtmp1);
__ sub(Llocals, Gtmp1, Gtmp2);
__ add(Gtmp2, wordSize, Gtmp2);
// Save these arguments
__ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), G2_thread, Gtmp1, Gtmp2);
// Inform deoptimization that it is responsible for restoring these arguments
__ set(JavaThread::popframe_force_deopt_reexecution_bit, Gtmp1);
Address popframe_condition_addr(G2_thread, JavaThread::popframe_condition_offset());
__ st(Gtmp1, popframe_condition_addr);
// Return from the current method
// The caller's SP was adjusted upon method entry to accomodate
// the callee's non-argument locals. Undo that adjustment.
__ ret();
__ delayed()->restore(I5_savedSP, G0, SP);
__ bind(caller_not_deoptimized);
}
// Clear the popframe condition flag
__ stw(G0 /* popframe_inactive */, popframe_condition_addr);
// Get out of the current method (how this is done depends on the particular compiler calling
// convention that the interpreter currently follows)
// The caller's SP was adjusted upon method entry to accomodate
// the callee's non-argument locals. Undo that adjustment.
__ restore(I5_savedSP, G0, SP);
// The method data pointer was incremented already during
// call profiling. We have to restore the mdp for the current bcp.
if (ProfileInterpreter) {
__ set_method_data_pointer_for_bcp();
}
#if INCLUDE_JVMTI
{ Label L_done;
__ ldub(Address(Lbcp, 0), G1_scratch); // Load current bytecode
__ cmp_and_br_short(G1_scratch, Bytecodes::_invokestatic, Assembler::notEqual, Assembler::pn, L_done);
// The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
// Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.
__ call_VM(G1_scratch, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), I0, Lmethod, Lbcp);
__ br_null(G1_scratch, false, Assembler::pn, L_done);
__ delayed()->nop();
__ st_ptr(G1_scratch, Lesp, wordSize);
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