jdk8-mips64-public/hotspot: src/cpu/ppc/vm/compiledIC

src/cpu/ppc/vm/compiledIC_ppc.cpp@c3d0bd36ab28 (annotated)

src/cpu/ppc/vm/compiledIC_ppc.cpp

Thu, 21 Apr 2016 16:19:33 +0300

author: vkempik
date: Thu, 21 Apr 2016 16:19:33 +0300
changeset 8427: c3d0bd36ab28
parent 7358: 327e7269f90d
permissions: -rw-r--r--

8130309: Need to bailout cleanly if creation of stubs fails when codecache is out of space
Summary: Check for failed expansion of stub section in code buffer and bailout.
Reviewed-by: kvn, thartmann

 /*
  * Copyright (c) 1997, 2014, 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 "asm/macroAssembler.inline.hpp"
 #include "code/compiledIC.hpp"
 #include "code/icBuffer.hpp"
 #include "code/nmethod.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/safepoint.hpp"
 #ifdef COMPILER2
 #include "opto/matcher.hpp"
 #endif
 // Release the CompiledICHolder* associated with this call site is there is one.
 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
   // This call site might have become stale so inspect it carefully.
   NativeCall* call = nativeCall_at(call_site->addr());
   if (is_icholder_entry(call->destination())) {
     NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
     InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
   }
 }
 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
   // This call site might have become stale so inspect it carefully.
   NativeCall* call = nativeCall_at(call_site->addr());
   return is_icholder_entry(call->destination());
 }
 // ----------------------------------------------------------------------------
 // A PPC CompiledStaticCall looks like this:
 //
 // >>>> consts
 //
 // [call target1]
 // [IC cache]
 // [call target2]
 //
 // <<<< consts
 // >>>> insts
 //
 // bl offset16               -+  -+             ??? // How many bits available?
 //                            |   |
 // <<<< insts                 |   |
 // >>>> stubs                 |   |
 //                            |   |- trampoline_stub_Reloc
 // trampoline stub:           | <-+
 //   r2 = toc                 |
 //   r2 = [r2 + offset]       |       // Load call target1 from const section
 //   mtctr r2                 |
 //   bctr                     |- static_stub_Reloc
 // comp_to_interp_stub:   <---+
 //   r1 = toc
 //   ICreg = [r1 + IC_offset]         // Load IC from const section
 //   r1    = [r1 + offset]            // Load call target2 from const section
 //   mtctr r1
 //   bctr
 //
 // <<<< stubs
 //
 // The call instruction in the code either
 // - branches directly to a compiled method if offset encodable in instruction
 // - branches to the trampoline stub if offset to compiled method not encodable
 // - branches to the compiled_to_interp stub if target interpreted
 //
 // Further there are three relocations from the loads to the constants in
 // the constant section.
 //
 // Usage of r1 and r2 in the stubs allows to distinguish them.
 const int IC_pos_in_java_to_interp_stub = 8;
 #define __ _masm.
 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
 #ifdef COMPILER2
   // Get the mark within main instrs section which is set to the address of the call.
   address call_addr = cbuf.insts_mark();
   // Note that the code buffer's insts_mark is always relative to insts.
   // That's why we must use the macroassembler to generate a stub.
   MacroAssembler _masm(&cbuf);
   // Start the stub.
   address stub = __ start_a_stub(CompiledStaticCall::to_interp_stub_size());
   if (stub == NULL) {
     return NULL; // CodeCache is full
   }
   // For java_to_interp stubs we use R11_scratch1 as scratch register
   // and in call trampoline stubs we use R12_scratch2. This way we
   // can distinguish them (see is_NativeCallTrampolineStub_at()).
   Register reg_scratch = R11_scratch1;
   // Create a static stub relocation which relates this stub
   // with the call instruction at insts_call_instruction_offset in the
   // instructions code-section.
   __ relocate(static_stub_Relocation::spec(call_addr));
   const int stub_start_offset = __ offset();
   // Now, create the stub's code:
   // - load the TOC
   // - load the inline cache oop from the constant pool
   // - load the call target from the constant pool
   // - call
   __ calculate_address_from_global_toc(reg_scratch, __ method_toc());
   AddressLiteral ic = __ allocate_metadata_address((Metadata *)NULL);
   __ load_const_from_method_toc(as_Register(Matcher::inline_cache_reg_encode()), ic, reg_scratch);
   if (ReoptimizeCallSequences) {
     __ b64_patchable((address)-1, relocInfo::none);
   } else {
     AddressLiteral a((address)-1);
     __ load_const_from_method_toc(reg_scratch, a, reg_scratch);
     __ mtctr(reg_scratch);
     __ bctr();
   }
   // FIXME: Assert that the stub can be identified and patched.
   // Java_to_interp_stub_size should be good.
   assert((__ offset() - stub_start_offset) <= CompiledStaticCall::to_interp_stub_size(),
          "should be good size");
   assert(!is_NativeCallTrampolineStub_at(__ addr_at(stub_start_offset)),
          "must not confuse java_to_interp with trampoline stubs");
  // End the stub.
   __ end_a_stub();
   return stub;
 #else
   ShouldNotReachHere();
 #endif
 }
 #undef __
 // Size of java_to_interp stub, this doesn't need to be accurate but it must
 // be larger or equal to the real size of the stub.
 // Used for optimization in Compile::Shorten_branches.
 int CompiledStaticCall::to_interp_stub_size() {
   return 12 * BytesPerInstWord;
 }
 // Relocation entries for call stub, compiled java to interpreter.
 // Used for optimization in Compile::Shorten_branches.
 int CompiledStaticCall::reloc_to_interp_stub() {
   return 5;
 }
 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
   address stub = find_stub();
   guarantee(stub != NULL, "stub not found");
   if (TraceICs) {
     ResourceMark rm;
     tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
                   p2i(instruction_address()),
                   callee->name_and_sig_as_C_string());
   }
   // Creation also verifies the object.
   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
   assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
          "a) MT-unsafe modification of inline cache");
   assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
          "b) MT-unsafe modification of inline cache");
   // Update stub.
   method_holder->set_data((intptr_t)callee());
   jump->set_jump_destination(entry);
   // Update jump to call.
   set_destination_mt_safe(stub);
 }
 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
   // Reset stub.
   address stub = static_stub->addr();
   assert(stub != NULL, "stub not found");
   // Creation also verifies the object.
   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
   method_holder->set_data(0);
   jump->set_jump_destination((address)-1);
 }
 //-----------------------------------------------------------------------------
 // Non-product mode code
 #ifndef PRODUCT
 void CompiledStaticCall::verify() {
   // Verify call.
   NativeCall::verify();
   if (os::is_MP()) {
     verify_alignment();
   }
   // Verify stub.
   address stub = find_stub();
   assert(stub != NULL, "no stub found for static call");
   // Creation also verifies the object.
   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
   // Verify state.
   assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
 }
 #endif // !PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/compiledIC_ppc.cpp@c3d0bd36ab28 (annotated)

src/cpu/ppc/vm/compiledIC_ppc.cpp