1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "asm/macroAssembler.inline.hpp"
  27 #include "code/compiledIC.hpp"
  28 #include "code/icBuffer.hpp"
  29 #include "code/nmethod.hpp"
  30 #include "memory/resourceArea.hpp"
  31 #include "runtime/mutexLocker.hpp"
  32 #include "runtime/safepoint.hpp"
  33 
  34 // Release the CompiledICHolder* associated with this call site is there is one.
  35 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
  36   // This call site might have become stale so inspect it carefully.
  37   NativeCall* call = nativeCall_at(call_site->addr());
  38   if (is_icholder_entry(call->destination())) {
  39     NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
  40     InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
  41   }
  42 }
  43 
  44 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
  45   // This call site might have become stale so inspect it carefully.
  46   NativeCall* call = nativeCall_at(call_site->addr());
  47   return is_icholder_entry(call->destination());
  48 }
  49 
  50 // ----------------------------------------------------------------------------
  51 
  52 #define __ _masm.
  53 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
  54   // Stub is fixed up when the corresponding call is converted from
  55   // calling compiled code to calling interpreted code.
  56   // movq rbx, 0
  57   // jmp -5 # to self
  58 
  59   address mark = cbuf.insts_mark();  // Get mark within main instrs section.
  60 
  61   // Note that the code buffer's insts_mark is always relative to insts.
  62   // That's why we must use the macroassembler to generate a stub.
  63   MacroAssembler _masm(&cbuf);
  64 
  65   address base = __ start_a_stub(to_interp_stub_size());
  66   if (base == NULL) {
  67     return NULL;  // CodeBuffer::expand failed.
  68   }
  69   // Static stub relocation stores the instruction address of the call.
  70   __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
  71   // Static stub relocation also tags the Method* in the code-stream.
  72   __ mov_metadata(rbx, (Metadata*) NULL);  // Method is zapped till fixup time.
  73   // This is recognized as unresolved by relocs/nativeinst/ic code.
  74   __ jump(RuntimeAddress(__ pc()));
  75 
  76   // Update current stubs pointer and restore insts_end.
  77   __ end_a_stub();
  78   return base;
  79 }
  80 #undef __
  81 
  82 int CompiledStaticCall::to_interp_stub_size() {
  83   return NOT_LP64(10)    // movl; jmp
  84          LP64_ONLY(15);  // movq (1+1+8); jmp (1+4)
  85 }
  86 
  87 // Relocation entries for call stub, compiled java to interpreter.
  88 int CompiledStaticCall::reloc_to_interp_stub() {
  89   return 4; // 3 in emit_to_interp_stub + 1 in emit_call
  90 }
  91 
  92 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
  93   address stub = find_stub();
  94   guarantee(stub != NULL, "stub not found");
  95 
  96   if (TraceICs) {
  97     ResourceMark rm;
  98     tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
  99                   p2i(instruction_address()),
 100                   callee->name_and_sig_as_C_string());
 101   }
 102 
 103   // Creation also verifies the object.
 104   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
 105   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 106 
 107   assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
 108          "a) MT-unsafe modification of inline cache");
 109   assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
 110          "b) MT-unsafe modification of inline cache");
 111 
 112   // Update stub.
 113   method_holder->set_data((intptr_t)callee());
 114   jump->set_jump_destination(entry);
 115 
 116   // Update jump to call.
 117   set_destination_mt_safe(stub);
 118 }
 119 
 120 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
 121   assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
 122   // Reset stub.
 123   address stub = static_stub->addr();
 124   assert(stub != NULL, "stub not found");
 125   // Creation also verifies the object.
 126   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
 127   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 128   method_holder->set_data(0);
 129   jump->set_jump_destination((address)-1);
 130 }
 131 
 132 //-----------------------------------------------------------------------------
 133 // Non-product mode code
 134 #ifndef PRODUCT
 135 
 136 void CompiledStaticCall::verify() {
 137   // Verify call.
 138   NativeCall::verify();
 139   if (os::is_MP()) {
 140     verify_alignment();
 141   }
 142 
 143   // Verify stub.
 144   address stub = find_stub();
 145   assert(stub != NULL, "no stub found for static call");
 146   // Creation also verifies the object.
 147   NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
 148   NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
 149 
 150   // Verify state.
 151   assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
 152 }
 153 
 154 #endif // !PRODUCT