< prev index next > src/hotspot/cpu/x86/c1_MacroAssembler_x86.cpp
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}
}
void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
! assert_different_registers(obj, klass, len);
- movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
#ifdef _LP64
! if (UseCompressedClassPointers) { // Take care not to kill klass
movptr(t1, klass);
encode_klass_not_null(t1, rscratch1);
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_header(Register obj, Register klass, Register len, Register t1, Register t2) {
! assert_different_registers(obj, klass, len, t1, t2);
#ifdef _LP64
! if (UseCompactObjectHeaders) {
+ movptr(t1, Address(klass, Klass::prototype_header_offset()));
+ movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
+ } else if (UseCompressedClassPointers) { // Take care not to kill klass
+ movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
movptr(t1, klass);
encode_klass_not_null(t1, rscratch1);
movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
} else
#endif
{
+ movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
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 && !UseCompactObjectHeaders) {
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;
+ assert(!UseCompactObjectHeaders || hdr_size_in_bytes == 8, "check object headers size");
initialize_header(obj, klass, noreg, t1, t2);
if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
// clear rest of allocated space
}
verify_oop(obj);
}
! void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) {
assert(obj == rax, "obj must be in rax, for cmpxchg");
assert_different_registers(obj, len, t1, t2, klass);
// determine alignment mask
assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
}
verify_oop(obj);
}
! void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int base_offset_in_bytes, Address::ScaleFactor f, Register klass, Label& slow_case) {
assert(obj == rax, "obj must be in rax, for cmpxchg");
assert_different_registers(obj, len, t1, t2, klass);
// determine alignment mask
assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
cmpptr(len, checked_cast<int32_t>(max_array_allocation_length));
jcc(Assembler::above, slow_case);
const Register arr_size = t2; // okay to be the same
// align object end
! movptr(arr_size, header_size * BytesPerWord + MinObjAlignmentInBytesMask);
lea(arr_size, Address(arr_size, len, f));
andptr(arr_size, ~MinObjAlignmentInBytesMask);
try_allocate(obj, arr_size, 0, t1, t2, slow_case);
initialize_header(obj, klass, len, t1, t2);
// clear rest of allocated space
const Register len_zero = len;
! initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
if (CURRENT_ENV->dtrace_alloc_probes()) {
assert(obj == rax, "must be");
call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
}
cmpptr(len, checked_cast<int32_t>(max_array_allocation_length));
jcc(Assembler::above, slow_case);
const Register arr_size = t2; // okay to be the same
// align object end
! movptr(arr_size, base_offset_in_bytes + MinObjAlignmentInBytesMask);
lea(arr_size, Address(arr_size, len, f));
andptr(arr_size, ~MinObjAlignmentInBytesMask);
try_allocate(obj, arr_size, 0, t1, t2, slow_case);
initialize_header(obj, klass, len, t1, t2);
+ // Clear leading 4 bytes, if necessary.
+ // TODO: This could perhaps go into initialize_body() and also clear the leading 4 bytes
+ // for non-array objects, thereby replacing the klass-gap clearing code in initialize_header().
+ int base_offset = base_offset_in_bytes;
+ #ifdef _LP64
+ if (!is_aligned(base_offset, BytesPerWord)) {
+ assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
+ movl(Address(obj, base_offset), 0);
+ base_offset += BytesPerInt;
+ }
+ #endif
+ assert(is_aligned(base_offset, BytesPerWord), "must be word aligned");
+
// clear rest of allocated space
const Register len_zero = len;
! initialize_body(obj, arr_size, base_offset, len_zero);
if (CURRENT_ENV->dtrace_alloc_probes()) {
assert(obj == rax, "must be");
call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
}
void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
verify_oop(receiver);
// explicit null check not needed since load from [klass_offset] causes a trap
! // check against inline cache
- assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
int start_offset = offset();
if (UseCompressedClassPointers) {
load_klass(rscratch1, receiver, rscratch2);
cmpptr(rscratch1, iCache);
void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
verify_oop(receiver);
// explicit null check not needed since load from [klass_offset] causes a trap
! // check against inline cache. This is checked in Universe::genesis().
int start_offset = offset();
if (UseCompressedClassPointers) {
load_klass(rscratch1, receiver, rscratch2);
cmpptr(rscratch1, iCache);
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