src/hotspot/cpu/x86/compiledIC_x86.cpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 42650 hotspot/src/cpu/x86/vm/compiledIC_x86.cpp@1f304d0c888b
child 48487 abf1d797e380
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "code/codeCache.hpp"
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#include "code/compiledIC.hpp"
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#include "code/icBuffer.hpp"
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#include "code/nmethod.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/safepoint.hpp"
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// ----------------------------------------------------------------------------
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#define __ _masm.
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address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
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  // Stub is fixed up when the corresponding call is converted from
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  // calling compiled code to calling interpreted code.
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  // movq rbx, 0
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  // jmp -5 # to self
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  if (mark == NULL) {
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    mark = cbuf.insts_mark();  // Get mark within main instrs section.
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  }
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  // Note that the code buffer's insts_mark is always relative to insts.
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  // That's why we must use the macroassembler to generate a stub.
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  MacroAssembler _masm(&cbuf);
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  address base = __ start_a_stub(to_interp_stub_size());
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  if (base == NULL) {
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    return NULL;  // CodeBuffer::expand failed.
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  }
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  // Static stub relocation stores the instruction address of the call.
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  __ relocate(static_stub_Relocation::spec(mark, false), Assembler::imm_operand);
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  // Static stub relocation also tags the Method* in the code-stream.
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  __ mov_metadata(rbx, (Metadata*) NULL);  // Method is zapped till fixup time.
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  // This is recognized as unresolved by relocs/nativeinst/ic code.
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  __ jump(RuntimeAddress(__ pc()));
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  assert(__ pc() - base <= to_interp_stub_size(), "wrong stub size");
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  // Update current stubs pointer and restore insts_end.
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  __ end_a_stub();
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  return base;
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}
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#undef __
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int CompiledStaticCall::to_interp_stub_size() {
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  return NOT_LP64(10)    // movl; jmp
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         LP64_ONLY(15);  // movq (1+1+8); jmp (1+4)
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}
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// Relocation entries for call stub, compiled java to interpreter.
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int CompiledStaticCall::reloc_to_interp_stub() {
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  return 4; // 3 in emit_to_interp_stub + 1 in emit_call
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}
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#if INCLUDE_AOT
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#define __ _masm.
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void CompiledStaticCall::emit_to_aot_stub(CodeBuffer &cbuf, address mark) {
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  if (!UseAOT) {
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    return;
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  }
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  // Stub is fixed up when the corresponding call is converted from
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  // calling compiled code to calling aot code.
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  // movq rax, imm64_aot_code_address
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  // jmp  rax
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  if (mark == NULL) {
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    mark = cbuf.insts_mark();  // Get mark within main instrs section.
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  }
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  // Note that the code buffer's insts_mark is always relative to insts.
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  // That's why we must use the macroassembler to generate a stub.
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  MacroAssembler _masm(&cbuf);
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  address base =
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  __ start_a_stub(to_aot_stub_size());
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  guarantee(base != NULL, "out of space");
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  // Static stub relocation stores the instruction address of the call.
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  __ relocate(static_stub_Relocation::spec(mark, true /* is_aot */), Assembler::imm_operand);
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  // Load destination AOT code address.
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#ifdef _LP64
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  __ mov64(rax, CONST64(0));  // address is zapped till fixup time.
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#else
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  __ movl(rax, 0);  // address is zapped till fixup time.
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#endif
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  // This is recognized as unresolved by relocs/nativeinst/ic code.
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  __ jmp(rax);
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  assert(__ pc() - base <= to_aot_stub_size(), "wrong stub size");
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  // Update current stubs pointer and restore insts_end.
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  __ end_a_stub();
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}
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#undef __
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int CompiledStaticCall::to_aot_stub_size() {
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  if (UseAOT) {
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    return NOT_LP64(7)    // movl; jmp
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           LP64_ONLY(12);  // movq (1+1+8); jmp (2)
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  } else {
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    return 0;
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  }
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}
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// Relocation entries for call stub, compiled java to aot.
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int CompiledStaticCall::reloc_to_aot_stub() {
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  if (UseAOT) {
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    return 2; // 1 in emit_to_aot_stub + 1 in emit_call
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  } else {
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    return 0;
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  }
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}
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#endif // INCLUDE_AOT
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void CompiledDirectStaticCall::set_to_interpreted(const methodHandle& callee, address entry) {
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  address stub = find_stub(false /* is_aot */);
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  guarantee(stub != NULL, "stub not found");
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  if (TraceICs) {
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    ResourceMark rm;
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    tty->print_cr("CompiledDirectStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
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                  p2i(instruction_address()),
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                  callee->name_and_sig_as_C_string());
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  }
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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  NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
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#ifdef ASSERT
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  // read the value once
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  intptr_t data = method_holder->data();
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  address destination = jump->jump_destination();
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  assert(data == 0 || data == (intptr_t)callee(),
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         "a) MT-unsafe modification of inline cache");
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  assert(destination == (address)-1 || destination == entry,
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         "b) MT-unsafe modification of inline cache");
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#endif
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  // Update stub.
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  method_holder->set_data((intptr_t)callee());
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  jump->set_jump_destination(entry);
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  // Update jump to call.
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  set_destination_mt_safe(stub);
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}
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void CompiledDirectStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
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  assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
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  // Reset stub.
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  address stub = static_stub->addr();
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  assert(stub != NULL, "stub not found");
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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  method_holder->set_data(0);
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  if (!static_stub->is_aot()) {
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    NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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    jump->set_jump_destination((address)-1);
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  }
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}
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//-----------------------------------------------------------------------------
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// Non-product mode code
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#ifndef PRODUCT
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void CompiledDirectStaticCall::verify() {
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  // Verify call.
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  _call->verify();
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  if (os::is_MP()) {
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    _call->verify_alignment();
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  }
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#ifdef ASSERT
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  CodeBlob *cb = CodeCache::find_blob_unsafe((address) _call);
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  assert(cb && !cb->is_aot(), "CompiledDirectStaticCall cannot be used on AOTCompiledMethod");
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#endif
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  // Verify stub.
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  address stub = find_stub(false /* is_aot */);
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  assert(stub != NULL, "no stub found for static call");
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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  NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
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  // Verify state.
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  assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
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}
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#endif // !PRODUCT