--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/aarch64/vm/c1_MacroAssembler_aarch64.cpp Tue Jan 20 12:47:43 2015 -0800
@@ -0,0 +1,458 @@
+/*
+ * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, Red Hat Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "c1/c1_MacroAssembler.hpp"
+#include "c1/c1_Runtime1.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "gc_interface/collectedHeap.hpp"
+#include "interpreter/interpreter.hpp"
+#include "oops/arrayOop.hpp"
+#include "oops/markOop.hpp"
+#include "runtime/basicLock.hpp"
+#include "runtime/biasedLocking.hpp"
+#include "runtime/os.hpp"
+#include "runtime/stubRoutines.hpp"
+
+void C1_MacroAssembler::float_cmp(bool is_float, int unordered_result,
+ FloatRegister f0, FloatRegister f1,
+ Register result)
+{
+ Label done;
+ if (is_float) {
+ fcmps(f0, f1);
+ } else {
+ fcmpd(f0, f1);
+ }
+ if (unordered_result < 0) {
+ // we want -1 for unordered or less than, 0 for equal and 1 for
+ // greater than.
+ cset(result, NE); // Not equal or unordered
+ cneg(result, result, LT); // Less than or unordered
+ } else {
+ // we want -1 for less than, 0 for equal and 1 for unordered or
+ // greater than.
+ cset(result, NE); // Not equal or unordered
+ cneg(result, result, LO); // Less than
+ }
+}
+
+int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) {
+ const int aligned_mask = BytesPerWord -1;
+ const int hdr_offset = oopDesc::mark_offset_in_bytes();
+ assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
+ Label done, fail;
+ int null_check_offset = -1;
+
+ verify_oop(obj);
+
+ // save object being locked into the BasicObjectLock
+ str(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
+
+ if (UseBiasedLocking) {
+ assert(scratch != noreg, "should have scratch register at this point");
+ null_check_offset = biased_locking_enter(disp_hdr, obj, hdr, scratch, false, done, &slow_case);
+ } else {
+ null_check_offset = offset();
+ }
+
+ // Load object header
+ ldr(hdr, Address(obj, hdr_offset));
+ // and mark it as unlocked
+ orr(hdr, hdr, markOopDesc::unlocked_value);
+ // save unlocked object header into the displaced header location on the stack
+ str(hdr, Address(disp_hdr, 0));
+ // test if object header is still the same (i.e. unlocked), and if so, store the
+ // displaced header address in the object header - if it is not the same, get the
+ // object header instead
+ lea(rscratch2, Address(obj, hdr_offset));
+ cmpxchgptr(hdr, disp_hdr, rscratch2, rscratch1, done, /*fallthough*/NULL);
+ // if the object header was the same, we're done
+ // if the object header was not the same, it is now in the hdr register
+ // => test if it is a stack pointer into the same stack (recursive locking), i.e.:
+ //
+ // 1) (hdr & aligned_mask) == 0
+ // 2) sp <= hdr
+ // 3) hdr <= sp + page_size
+ //
+ // these 3 tests can be done by evaluating the following expression:
+ //
+ // (hdr - sp) & (aligned_mask - page_size)
+ //
+ // assuming both the stack pointer and page_size have their least
+ // significant 2 bits cleared and page_size is a power of 2
+ mov(rscratch1, sp);
+ sub(hdr, hdr, rscratch1);
+ ands(hdr, hdr, aligned_mask - os::vm_page_size());
+ // for recursive locking, the result is zero => save it in the displaced header
+ // location (NULL in the displaced hdr location indicates recursive locking)
+ str(hdr, Address(disp_hdr, 0));
+ // otherwise we don't care about the result and handle locking via runtime call
+ cbnz(hdr, slow_case);
+ // done
+ bind(done);
+ if (PrintBiasedLockingStatistics) {
+ lea(rscratch2, ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr()));
+ addmw(Address(rscratch2, 0), 1, rscratch1);
+ }
+ return null_check_offset;
+}
+
+
+void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case) {
+ const int aligned_mask = BytesPerWord -1;
+ const int hdr_offset = oopDesc::mark_offset_in_bytes();
+ assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
+ Label done;
+
+ if (UseBiasedLocking) {
+ // load object
+ ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
+ biased_locking_exit(obj, hdr, done);
+ }
+
+ // load displaced header
+ ldr(hdr, Address(disp_hdr, 0));
+ // if the loaded hdr is NULL we had recursive locking
+ // if we had recursive locking, we are done
+ cbz(hdr, done);
+ if (!UseBiasedLocking) {
+ // load object
+ ldr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
+ }
+ verify_oop(obj);
+ // test if object header is pointing to the displaced header, and if so, restore
+ // the displaced header in the object - if the object header is not pointing to
+ // the displaced header, get the object header instead
+ // if the object header was not pointing to the displaced header,
+ // we do unlocking via runtime call
+ if (hdr_offset) {
+ lea(rscratch1, Address(obj, hdr_offset));
+ cmpxchgptr(disp_hdr, hdr, rscratch1, rscratch2, done, &slow_case);
+ } else {
+ cmpxchgptr(disp_hdr, hdr, obj, rscratch2, done, &slow_case);
+ }
+ // done
+ bind(done);
+}
+
+
+// Defines obj, preserves var_size_in_bytes
+void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
+ if (UseTLAB) {
+ tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
+ } else {
+ eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case);
+ incr_allocated_bytes(noreg, var_size_in_bytes, con_size_in_bytes, t1);
+ }
+}
+
+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);
+ ldr(t1, Address(klass, Klass::prototype_header_offset()));
+ } else {
+ // This assumes that all prototype bits fit in an int32_t
+ mov(t1, (int32_t)(intptr_t)markOopDesc::prototype());
+ }
+ 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);
+ }
+}
+
+// Zero words; len is in bytes
+// Destroys all registers except addr
+// len must be a nonzero multiple of wordSize
+void C1_MacroAssembler::zero_memory(Register addr, Register len, Register t1) {
+ assert_different_registers(addr, len, t1, rscratch1, rscratch2);
+
+#ifdef ASSERT
+ { Label L;
+ tst(len, BytesPerWord - 1);
+ br(Assembler::EQ, L);
+ stop("len is not a multiple of BytesPerWord");
+ bind(L);
+ }
+#endif
+
+#ifndef PRODUCT
+ block_comment("zero memory");
+#endif
+
+ Label loop;
+ Label entry;
+
+// Algorithm:
+//
+// scratch1 = cnt & 7;
+// cnt -= scratch1;
+// p += scratch1;
+// switch (scratch1) {
+// do {
+// cnt -= 8;
+// p[-8] = 0;
+// case 7:
+// p[-7] = 0;
+// case 6:
+// p[-6] = 0;
+// // ...
+// case 1:
+// p[-1] = 0;
+// case 0:
+// p += 8;
+// } while (cnt);
+// }
+
+ const int unroll = 8; // Number of str(zr) instructions we'll unroll
+
+ lsr(len, len, LogBytesPerWord);
+ andr(rscratch1, len, unroll - 1); // tmp1 = cnt % unroll
+ sub(len, len, rscratch1); // cnt -= unroll
+ // t1 always points to the end of the region we're about to zero
+ add(t1, addr, rscratch1, Assembler::LSL, LogBytesPerWord);
+ adr(rscratch2, entry);
+ sub(rscratch2, rscratch2, rscratch1, Assembler::LSL, 2);
+ br(rscratch2);
+ bind(loop);
+ sub(len, len, unroll);
+ for (int i = -unroll; i < 0; i++)
+ str(zr, Address(t1, i * wordSize));
+ bind(entry);
+ add(t1, t1, unroll * wordSize);
+ cbnz(len, 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
+ subs(index, index, hdr_size_in_bytes);
+ br(Assembler::EQ, done);
+ // note: for the remaining code to work, index must be a multiple of BytesPerWord
+#ifdef ASSERT
+ { Label L;
+ tst(index, BytesPerWord - 1);
+ br(Assembler::EQ, L);
+ stop("index is not a multiple of BytesPerWord");
+ bind(L);
+ }
+#endif
+
+ // Preserve obj
+ if (hdr_size_in_bytes)
+ add(obj, obj, hdr_size_in_bytes);
+ zero_memory(obj, index, t1);
+ if (hdr_size_in_bytes)
+ sub(obj, obj, hdr_size_in_bytes);
+
+ // done
+ bind(done);
+}
+
+
+void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
+ assert_different_registers(obj, t1, t2); // XXX really?
+ assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
+
+ try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
+
+ initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2);
+}
+
+void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2) {
+ 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);
+
+ // clear rest of allocated space
+ const Register index = t2;
+ const int threshold = 16 * 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);
+ } else if (con_size_in_bytes <= threshold) {
+ // use explicit null stores
+ int i = hdr_size_in_bytes;
+ if (i < con_size_in_bytes && (con_size_in_bytes % (2 * BytesPerWord))) {
+ str(zr, Address(obj, i));
+ i += BytesPerWord;
+ }
+ for (; i < con_size_in_bytes; i += 2 * BytesPerWord)
+ stp(zr, zr, Address(obj, i));
+ } else if (con_size_in_bytes > hdr_size_in_bytes) {
+ block_comment("zero memory");
+ // use loop to null out the fields
+
+ int words = (con_size_in_bytes - hdr_size_in_bytes) / BytesPerWord;
+ mov(index, words / 8);
+
+ const int unroll = 8; // Number of str(zr) instructions we'll unroll
+ int remainder = words % unroll;
+ lea(rscratch1, Address(obj, hdr_size_in_bytes + remainder * BytesPerWord));
+
+ Label entry_point, loop;
+ b(entry_point);
+
+ bind(loop);
+ sub(index, index, 1);
+ for (int i = -unroll; i < 0; i++) {
+ if (-i == remainder)
+ bind(entry_point);
+ str(zr, Address(rscratch1, i * wordSize));
+ }
+ if (remainder == 0)
+ bind(entry_point);
+ add(rscratch1, rscratch1, unroll * wordSize);
+ cbnz(index, loop);
+
+ }
+
+ membar(StoreStore);
+
+ if (CURRENT_ENV->dtrace_alloc_probes()) {
+ assert(obj == r0, "must be");
+ 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");
+
+ // check for negative or excessive length
+ mov(rscratch1, (int32_t)max_array_allocation_length);
+ 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
+ const Register len_zero = len;
+ initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
+
+ membar(StoreStore);
+
+ if (CURRENT_ENV->dtrace_alloc_probes()) {
+ assert(obj == r0, "must be");
+ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
+ }
+
+ verify_oop(obj);
+}
+
+
+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::build_frame(int framesize, int bang_size_in_bytes) {
+ // If we have to make this method not-entrant we'll overwrite its
+ // first instruction with a jump. For this action to be legal we
+ // must ensure that this first instruction is a B, BL, NOP, BKPT,
+ // SVC, HVC, or SMC. Make it a NOP.
+ nop();
+ assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");
+ // Make sure there is enough stack space for this method's activation.
+ // Note that we do this before doing an enter().
+ generate_stack_overflow_check(bang_size_in_bytes);
+ MacroAssembler::build_frame(framesize + 2 * wordSize);
+ if (NotifySimulator) {
+ notify(Assembler::method_entry);
+ }
+}
+
+void C1_MacroAssembler::remove_frame(int framesize) {
+ MacroAssembler::remove_frame(framesize + 2 * wordSize);
+ if (NotifySimulator) {
+ notify(Assembler::method_reentry);
+ }
+}
+
+
+void C1_MacroAssembler::verified_entry() {
+}
+
+#ifndef PRODUCT
+
+void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
+ if (!VerifyOops) return;
+ verify_oop_addr(Address(sp, stack_offset), "oop");
+}
+
+void C1_MacroAssembler::verify_not_null_oop(Register r) {
+ if (!VerifyOops) return;
+ Label not_null;
+ cbnz(r, not_null);
+ stop("non-null oop required");
+ bind(not_null);
+ verify_oop(r);
+}
+
+void C1_MacroAssembler::invalidate_registers(bool inv_r0, bool inv_r19, bool inv_r2, bool inv_r3, bool inv_r4, bool inv_r5) {
+#ifdef ASSERT
+ static int nn;
+ if (inv_r0) mov(r0, 0xDEAD);
+ if (inv_r19) mov(r19, 0xDEAD);
+ if (inv_r2) mov(r2, nn++);
+ if (inv_r3) mov(r3, 0xDEAD);
+ if (inv_r4) mov(r4, 0xDEAD);
+ if (inv_r5) mov(r5, 0xDEAD);
+#endif
+}
+#endif // ifndef PRODUCT