jdk8-mips64-public/hotspot: src/cpu/x86/vm/c1_MacroAssembler

src/cpu/x86/vm/c1_MacroAssembler_x86.cpp@f90c822e73f8 (annotated)

src/cpu/x86/vm/c1_MacroAssembler_x86.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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"
 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 == rax, "hdr must be rax, for the cmpxchg instruction");
   assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
   Label done;
   int null_check_offset = -1;
   verify_oop(obj);
   // save object being locked into the BasicObjectLock
   movptr(Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()), obj);
   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
   movptr(hdr, Address(obj, hdr_offset));
   // and mark it as unlocked
   orptr(hdr, markOopDesc::unlocked_value);
   // save unlocked object header into the displaced header location on the stack
   movptr(Address(disp_hdr, 0), hdr);
   // 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
   if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg!
   cmpxchgptr(disp_hdr, Address(obj, hdr_offset));
   // if the object header was the same, we're done
   if (PrintBiasedLockingStatistics) {
     cond_inc32(Assembler::equal,
                ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr()));
   }
   jcc(Assembler::equal, 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) rsp <= hdr
   // 3) hdr <= rsp + page_size
   //
   // these 3 tests can be done by evaluating the following expression:
   //
   // (hdr - rsp) & (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
   subptr(hdr, rsp);
   andptr(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)
   movptr(Address(disp_hdr, 0), hdr);
   // otherwise we don't care about the result and handle locking via runtime call
   jcc(Assembler::notZero, slow_case);
   // done
   bind(done);
   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(disp_hdr == rax, "disp_hdr must be rax, for the cmpxchg instruction");
   assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
   Label done;
   if (UseBiasedLocking) {
     // load object
     movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()));
     biased_locking_exit(obj, hdr, done);
   }
   // load displaced header
   movptr(hdr, Address(disp_hdr, 0));
   // if the loaded hdr is NULL we had recursive locking
   testptr(hdr, hdr);
   // if we had recursive locking, we are done
   jcc(Assembler::zero, done);
   if (!UseBiasedLocking) {
     // load object
     movptr(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 (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg!
   cmpxchgptr(hdr, Address(obj, hdr_offset));
   // if the object header was not pointing to the displaced header,
   // we do unlocking via runtime call
   jcc(Assembler::notEqual, 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);
     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
 }
 // 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);
   }
   // 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(obj == rax, "obj must be in rax, for cmpxchg");
   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 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);
     }
   }
   if (CURRENT_ENV->dtrace_alloc_probes()) {
     assert(obj == rax, "must be");
     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, 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");
   // check for negative or excessive length
   cmpptr(len, (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, (int32_t)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)));
   }
   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");
   int start_offset = offset();
   if (UseCompressedClassPointers) {
     load_klass(rscratch1, receiver);
     cmpptr(rscratch1, iCache);
   } else {
     cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
   }
   // if icache check fails, then jump to runtime routine
   // Note: RECEIVER must still contain the receiver!
   jump_cc(Assembler::notEqual,
           RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
   const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
   assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
 }
 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
   assert(bang_size_in_bytes >= frame_size_in_bytes, "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(). This matches the
   // ordering of C2's stack overflow check / rsp decrement and allows
   // the SharedRuntime stack overflow handling to be consistent
   // between the two compilers.
   generate_stack_overflow_check(bang_size_in_bytes);
   push(rbp);
 #ifdef TIERED
   // c2 leaves fpu stack dirty. Clean it on entry
   if (UseSSE < 2 ) {
     empty_FPU_stack();
   }
 #endif // TIERED
   decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0
 }
 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) {
   increment(rsp, frame_size_in_bytes);  // Does not emit code for frame_size == 0
   pop(rbp);
 }
 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) {
   if (C1Breakpoint) int3();
   inline_cache_check(receiver, ic_klass);
 }
 void C1_MacroAssembler::verified_entry() {
   if (C1Breakpoint || VerifyFPU || !UseStackBanging) {
     // Verified Entry first instruction should be 5 bytes long for correct
     // patching by patch_verified_entry().
     //
     // C1Breakpoint and VerifyFPU have one byte first instruction.
     // Also first instruction will be one byte "push(rbp)" if stack banging
     // code is not generated (see build_frame() above).
     // For all these cases generate long instruction first.
     fat_nop();
   }
   if (C1Breakpoint)int3();
   // build frame
   verify_FPU(0, "method_entry");
 }
 #ifndef PRODUCT
 void C1_MacroAssembler::verify_stack_oop(int stack_offset) {
   if (!VerifyOops) return;
   verify_oop_addr(Address(rsp, stack_offset));
 }
 void C1_MacroAssembler::verify_not_null_oop(Register r) {
   if (!VerifyOops) return;
   Label not_null;
   testptr(r, r);
   jcc(Assembler::notZero, not_null);
   stop("non-null oop required");
   bind(not_null);
   verify_oop(r);
 }
 void C1_MacroAssembler::invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) {
 #ifdef ASSERT
   if (inv_rax) movptr(rax, 0xDEAD);
   if (inv_rbx) movptr(rbx, 0xDEAD);
   if (inv_rcx) movptr(rcx, 0xDEAD);
   if (inv_rdx) movptr(rdx, 0xDEAD);
   if (inv_rsi) movptr(rsi, 0xDEAD);
   if (inv_rdi) movptr(rdi, 0xDEAD);
 #endif
 }
 #endif // ifndef PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/c1_MacroAssembler_x86.cpp@f90c822e73f8 (annotated)

src/cpu/x86/vm/c1_MacroAssembler_x86.cpp