< prev index next > src/hotspot/cpu/aarch64/c1_MacroAssembler_aarch64.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);
! // This assumes that all prototype bits fit in an int32_t
- mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
- if (UseCompressedClassPointers) { // Take care not to kill klass
- encode_klass_not_null(t1, klass);
- strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
- } else {
- str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
- }
-
if (len->is_valid()) {
strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
- } else if (UseCompressedClassPointers) {
- store_klass_gap(obj, zr);
}
}
// preserves obj, destroys len_in_bytes
//
}
}
void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
assert_different_registers(obj, klass, len);
! ldr(t1, Address(klass, Klass::prototype_header_offset()));
str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
if (len->is_valid()) {
strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
}
}
// preserves obj, destroys len_in_bytes
//
// len_in_bytes is positive and ptr sized
subs(len_in_bytes, len_in_bytes, hdr_size_in_bytes);
br(Assembler::EQ, done);
+ // Zero first 4 bytes, if start offset is not word aligned.
+ if (!is_aligned(hdr_size_in_bytes, BytesPerWord)) {
+ strw(zr, Address(obj, hdr_size_in_bytes));
+ hdr_size_in_bytes += BytesPerInt;
+ }
+
// zero_words() takes ptr in r10 and count in words in r11
mov(rscratch1, len_in_bytes);
lea(t1, Address(obj, hdr_size_in_bytes));
lsr(t2, rscratch1, LogBytesPerWord);
zero_words(t1, t2);
far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
}
verify_oop(obj);
}
! void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, int f, Register klass, Label& slow_case) {
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");
far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
}
verify_oop(obj);
}
! void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int base_offset_in_bytes, int f, Register klass, Label& slow_case) {
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");
cmp(len, rscratch1);
br(Assembler::HS, slow_case);
const Register arr_size = t2; // okay to be the same
// align object end
! mov(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
add(arr_size, arr_size, len, ext::uxtw, f);
andr(arr_size, 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
! initialize_body(obj, arr_size, header_size * BytesPerWord, t1, t2);
membar(StoreStore);
if (CURRENT_ENV->dtrace_alloc_probes()) {
assert(obj == r0, "must be");
cmp(len, rscratch1);
br(Assembler::HS, slow_case);
const Register arr_size = t2; // okay to be the same
// align object end
! mov(arr_size, (int32_t)base_offset_in_bytes + MinObjAlignmentInBytesMask);
add(arr_size, arr_size, len, ext::uxtw, f);
andr(arr_size, 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
! initialize_body(obj, arr_size, base_offset_in_bytes, t1, t2);
membar(StoreStore);
if (CURRENT_ENV->dtrace_alloc_probes()) {
assert(obj == r0, "must be");
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");
cmp_klass(receiver, iCache, rscratch1);
}
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::mark_offset_in_bytes()), "must add explicit null check");
cmp_klass(receiver, iCache, rscratch1);
}
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