void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
assert_different_registers(obj, klass, len);
if (UseBiasedLocking && !len->is_valid()) {
assert_different_registers(obj, klass, len, t1, t2);
movptr(t1, Address(klass, Klass::prototype_header_offset()));
movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
} else {
// This assumes that all prototype bits fit in an int32_t
movptr(Address(obj, oopDesc::mark_offset_in_bytes ()), (int32_t)(intptr_t)markOopDesc::prototype());
}
#ifdef _LP64
if (UseCompressedClassPointers) { // Take care not to kill klass
movptr(t1, klass);
encode_klass_not_null(t1);
movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
} else
#endif
{
movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
}
if (len->is_valid()) {
movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
}
#ifdef _LP64
else if (UseCompressedClassPointers) {
xorptr(t1, t1);
store_klass_gap(obj, t1);
}
#endif
}
void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, bool is_tlab_allocated) {
assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
"con_size_in_bytes is not multiple of alignment");
const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
initialize_header(obj, klass, noreg, t1, t2);
if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
// clear rest of allocated space
const Register t1_zero = t1;
const Register index = t2;
const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
if (var_size_in_bytes != noreg) {
mov(index, var_size_in_bytes);
initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
} else if (con_size_in_bytes <= threshold) {
// use explicit null stores
// code size = 2 + 3*n bytes (n = number of fields to clear)
xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
movptr(Address(obj, i), t1_zero);
} else if (con_size_in_bytes > hdr_size_in_bytes) {
// use loop to null out the fields
// code size = 16 bytes for even n (n = number of fields to clear)
// initialize last object field first if odd number of fields
xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
movptr(index, (con_size_in_bytes - hdr_size_in_bytes) >> 3);
// initialize last object field if constant size is odd
if (((con_size_in_bytes - hdr_size_in_bytes) & 4) != 0)
movptr(Address(obj, con_size_in_bytes - (1*BytesPerWord)), t1_zero);
// initialize remaining object fields: rdx is a multiple of 2
{ Label loop;
bind(loop);
movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)),
t1_zero);
NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)),
t1_zero);)
decrement(index);
jcc(Assembler::notZero, loop);
}
}
// preserves obj, destroys len_in_bytes
void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
Label done;
assert(obj != len_in_bytes && obj != t1 && t1 != len_in_bytes, "registers must be different");
assert((hdr_size_in_bytes & (BytesPerWord - 1)) == 0, "header size is not a multiple of BytesPerWord");
Register index = len_in_bytes;
// index is positive and ptr sized
subptr(index, hdr_size_in_bytes);
jcc(Assembler::zero, done);
// initialize topmost word, divide index by 2, check if odd and test if zero
// note: for the remaining code to work, index must be a multiple of BytesPerWord
#ifdef ASSERT
{ Label L;
testptr(index, BytesPerWord - 1);
jcc(Assembler::zero, L);
stop("index is not a multiple of BytesPerWord");
bind(L);
}
#endif
xorptr(t1, t1); // use _zero reg to clear memory (shorter code)
if (UseIncDec) {
shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set
} else {
shrptr(index, 2); // use 2 instructions to avoid partial flag stall
shrptr(index, 1);
}
#ifndef _LP64
// index could have been not a multiple of 8 (i.e., bit 2 was set)
{ Label even;
// note: if index was a multiple of 8, than it cannot
// be 0 now otherwise it must have been 0 before
// => if it is even, we don't need to check for 0 again
jcc(Assembler::carryClear, even);
// clear topmost word (no jump needed if conditional assignment would work here)
movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 0*BytesPerWord), t1);
// index could be 0 now, need to check again
jcc(Assembler::zero, done);
bind(even);
}
#endif // !_LP64
// initialize remaining object fields: rdx is a multiple of 2 now
{ Label loop;
bind(loop);
movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 1*BytesPerWord), t1);
NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 2*BytesPerWord), t1);)
decrement(index);
jcc(Assembler::notZero, loop);
}
void ConversionStub::emit_code(LIR_Assembler* ce) {
__ bind(_entry);
assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
if (input()->is_single_xmm()) {
__ comiss(input()->as_xmm_float_reg(),
ExternalAddress((address)&float_zero));
} else if (input()->is_double_xmm()) {
__ comisd(input()->as_xmm_double_reg(),
ExternalAddress((address)&double_zero));
} else {
LP64_ONLY(ShouldNotReachHere());
__ push(rax);
__ ftst();
__ fnstsw_ax();
__ sahf();
__ pop(rax);
}
Label NaN, do_return;
__ jccb(Assembler::parity, NaN);
__ jccb(Assembler::below, do_return);
// input is > 0 -> return maxInt
// result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
__ decrement(result()->as_register());
__ jmpb(do_return);
// input is NaN -> return 0
__ bind(NaN);
__ xorptr(result()->as_register(), result()->as_register());
__ bind(do_return);
__ jmp(_continuation);
}
address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
const char *name;
switch (type) {
case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
case T_BYTE: name = "jni_fast_GetByteField"; break;
case T_CHAR: name = "jni_fast_GetCharField"; break;
case T_SHORT: name = "jni_fast_GetShortField"; break;
case T_INT: name = "jni_fast_GetIntField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
address fast_entry = b->instructions_begin();
CodeBuffer cbuf(fast_entry, b->instructions_size());
MacroAssembler* masm = new MacroAssembler(&cbuf);
Label slow;
// stack layout: offset from rsp (in words):
// return pc 0
// jni env 1
// obj 2
// jfieldID 3
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr (rdx, Address(rsp, 2*wordSize)); // obj
}
__ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr (rax, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
default: ShouldNotReachHere();
}
Address ca1;
if (os::is_MP()) {
__ lea(rdx, counter);
__ xorptr(rdx, rax);
__ xorptr(rdx, rax);
__ cmp32(rcx, Address(rdx, 0));
// ca1 is the same as ca because
// rax, ^ counter_addr ^ rax, = address
// ca1 is data dependent on rax,.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr;
switch (type) {
case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
case T_INT: slow_case_addr = jni_GetIntField_addr();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
switch (type) {
case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t)fast_entry; break;
case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t)fast_entry; break;
case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t)fast_entry; break;
case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t)fast_entry; break;
case T_INT: jni_fast_GetIntField_fp = (GetIntField_t)fast_entry;
}
return os::win32::fast_jni_accessor_wrapper(type);
#endif
}
address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
const char *name;
switch (type) {
case T_FLOAT: name = "jni_fast_GetFloatField"; break;
case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
address fast_entry = b->instructions_begin();
CodeBuffer cbuf(fast_entry, b->instructions_size());
MacroAssembler* masm = new MacroAssembler(&cbuf);
Label slow_with_pop, slow;
// stack layout: offset from rsp (in words):
// return pc 0
// jni env 1
// obj 2
// jfieldID 3
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr(rdx, Address(rsp, 2*wordSize)); // obj
}
__ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr(rax, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
#ifndef _LP64
case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
#else
case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
#endif // _LP64
default: ShouldNotReachHere();
}
Address ca1;
if (os::is_MP()) {
__ fst_s (Address(rsp, -4));
__ lea(rdx, counter);
__ movl (rax, Address(rsp, -4));
// garbage hi-order bits on 64bit are harmless.
__ xorptr(rdx, rax);
__ xorptr(rdx, rax);
__ cmp32(rcx, Address(rdx, 0));
// rax, ^ counter_addr ^ rax, = address
// ca1 is data dependent on the field
// access.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow_with_pop);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
__ bind (slow_with_pop);
// invalid load. pop FPU stack.
__ fstp_d (0);
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr;
switch (type) {
case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
default: ShouldNotReachHere();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
switch (type) {
case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t)fast_entry; break;
case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t)fast_entry;
}
return os::win32::fast_jni_accessor_wrapper(type);
#endif
}
address JNI_FastGetField::generate_fast_get_long_field() {
const char *name = "jni_fast_GetLongField";
ResourceMark rm;
BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE*wordSize);
address fast_entry = b->instructions_begin();
CodeBuffer cbuf(fast_entry, b->instructions_size());
MacroAssembler* masm = new MacroAssembler(&cbuf);
Label slow;
// stack layout: offset from rsp (in words):
// old rsi 0
// return pc 1
// jni env 2
// obj 3
// jfieldID 4
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ push (rsi);
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr(rdx, Address(rsp, 3*wordSize)); // obj
}
__ movptr(rsi, Address(rsp, 4*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr(rsi, 2); // offset
assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
speculative_load_pclist[count++] = __ pc();
__ movptr(rax, Address(rdx, rsi, Address::times_1));
#ifndef _LP64
speculative_load_pclist[count] = __ pc();
__ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
#endif // _LP64
if (os::is_MP()) {
__ lea(rsi, counter);
__ xorptr(rsi, rdx);
__ xorptr(rsi, rax);
__ xorptr(rsi, rdx);
__ xorptr(rsi, rax);
__ cmp32(rcx, Address(rsi, 0));
// ca1 is the same as ca because
// rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
// ca1 is data dependent on both rax, and rdx.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow);
__ pop (rsi);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
slowcase_entry_pclist[count-1] = __ pc();
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
__ pop (rsi);
address slow_case_addr = jni_GetLongField_addr();;
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
jni_fast_GetLongField_fp = (GetLongField_t)fast_entry;
return os::win32::fast_jni_accessor_wrapper(T_LONG);
#endif
}
address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
const char *name;
switch (type) {
case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
case T_BYTE: name = "jni_fast_GetByteField"; break;
case T_CHAR: name = "jni_fast_GetCharField"; break;
case T_SHORT: name = "jni_fast_GetShortField"; break;
case T_INT: name = "jni_fast_GetIntField"; break;
case T_LONG: name = "jni_fast_GetLongField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE);
address fast_entry = b->instructions_begin();
CodeBuffer cbuf(fast_entry, b->instructions_size());
MacroAssembler* masm = new MacroAssembler(&cbuf);
Label slow;
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcounter, counter);
__ mov (robj, c_rarg1);
__ testb (rcounter, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ xorptr(robj, rcounter);
__ xorptr(robj, rcounter); // obj, since
// robj ^ rcounter ^ rcounter == robj
// robj is data dependent on rcounter.
}
__ movptr(robj, Address(robj, 0)); // *obj
__ mov (roffset, c_rarg2);
__ shrptr(roffset, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
default: ShouldNotReachHere();
}
if (os::is_MP()) {
__ lea(rcounter_addr, counter);
// ca is data dependent on rax.
__ xorptr(rcounter_addr, rax);
__ xorptr(rcounter_addr, rax);
__ cmpl (rcounter, Address(rcounter_addr, 0));
} else {
__ cmp32 (rcounter, counter);
}
__ jcc (Assembler::notEqual, slow);
__ ret (0);
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr;
switch (type) {
case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
case T_LONG: slow_case_addr = jni_GetLongField_addr();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
return fast_entry;
}
address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
const char *name = NULL;
switch (type) {
case T_FLOAT: name = "jni_fast_GetFloatField"; break;
case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow;
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcounter, counter);
__ mov (robj, c_rarg1);
__ testb (rcounter, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ xorptr(robj, rcounter);
__ xorptr(robj, rcounter); // obj, since
// robj ^ rcounter ^ rcounter == robj
// robj is data dependent on rcounter.
}
__ clear_jweak_tag(robj);
__ movptr(robj, Address(robj, 0)); // *obj
__ mov (roffset, c_rarg2);
__ shrptr(roffset, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
default: ShouldNotReachHere();
}
if (os::is_MP()) {
__ lea(rcounter_addr, counter);
__ movdq (rax, xmm0);
// counter address is data dependent on xmm0.
__ xorptr(rcounter_addr, rax);
__ xorptr(rcounter_addr, rax);
__ cmpl (rcounter, Address(rcounter_addr, 0));
} else {
__ cmp32 (rcounter, counter);
}
__ jcc (Assembler::notEqual, slow);
__ ret (0);
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr = NULL;
switch (type) {
case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
return fast_entry;
}
