< prev index next > src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
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ldr(holder, Address(method, Method::const_offset())); // ConstMethod*
ldr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
ldr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
}
void MacroAssembler::load_klass(Register dst, Register src) {
if (UseCompressedClassPointers) {
! ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
decode_klass_not_null(dst);
} else {
ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
}
}
ldr(holder, Address(method, Method::const_offset())); // ConstMethod*
ldr(holder, Address(holder, ConstMethod::constants_offset())); // ConstantPool*
ldr(holder, Address(holder, ConstantPool::pool_holder_offset())); // InstanceKlass*
}
+ // Loads the obj's Klass* into dst.
+ // Preserves all registers (incl src, rscratch1 and rscratch2).
+ void MacroAssembler::load_nklass(Register dst, Register src) {
+ assert(UseCompressedClassPointers, "expects UseCompressedClassPointers");
+
+ if (!UseCompactObjectHeaders) {
+ ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
+ return;
+ }
+
+ Label fast;
+
+ // Check if we can take the (common) fast path, if obj is unlocked.
+ ldr(dst, Address(src, oopDesc::mark_offset_in_bytes()));
+ tbz(dst, exact_log2(markWord::monitor_value), fast);
+
+ // Fetch displaced header
+ ldr(dst, Address(dst, OM_OFFSET_NO_MONITOR_VALUE_TAG(header)));
+
+ // Fast-path: shift and decode Klass*.
+ bind(fast);
+ lsr(dst, dst, markWord::klass_shift);
+ }
+
void MacroAssembler::load_klass(Register dst, Register src) {
if (UseCompressedClassPointers) {
! if (UseCompactObjectHeaders) {
+ load_nklass(dst, src);
+ } else {
+ ldrw(dst, Address(src, oopDesc::klass_offset_in_bytes()));
+ }
decode_klass_not_null(dst);
} else {
ldr(dst, Address(src, oopDesc::klass_offset_in_bytes()));
}
}
ldr(dst, Address(dst, mirror_offset));
resolve_oop_handle(dst, tmp1, tmp2);
}
void MacroAssembler::cmp_klass(Register oop, Register trial_klass, Register tmp) {
if (UseCompressedClassPointers) {
! ldrw(tmp, Address(oop, oopDesc::klass_offset_in_bytes()));
if (CompressedKlassPointers::base() == nullptr) {
cmp(trial_klass, tmp, LSL, CompressedKlassPointers::shift());
return;
} else if (((uint64_t)CompressedKlassPointers::base() & 0xffffffff) == 0
&& CompressedKlassPointers::shift() == 0) {
ldr(dst, Address(dst, mirror_offset));
resolve_oop_handle(dst, tmp1, tmp2);
}
void MacroAssembler::cmp_klass(Register oop, Register trial_klass, Register tmp) {
+ assert_different_registers(oop, trial_klass, tmp);
if (UseCompressedClassPointers) {
! if (UseCompactObjectHeaders) {
+ load_nklass(tmp, oop);
+ } else {
+ ldrw(tmp, Address(oop, oopDesc::klass_offset_in_bytes()));
+ }
if (CompressedKlassPointers::base() == nullptr) {
cmp(trial_klass, tmp, LSL, CompressedKlassPointers::shift());
return;
} else if (((uint64_t)CompressedKlassPointers::base() & 0xffffffff) == 0
&& CompressedKlassPointers::shift() == 0) {
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