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/*
* Copyright (c) 1997, 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 "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"
// 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());
}
//-----------------------------------------------------------------------------
// High-level access to an inline cache. Guaranteed to be MT-safe.
CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
: _ic_call(call)
{
address ic_call = call->instruction_address();
assert(ic_call != NULL, "ic_call address must be set");
assert(nm != NULL, "must pass nmethod");
assert(nm->contains(ic_call), "must be in nmethod");
// Search for the ic_call at the given address.
RelocIterator iter(nm, ic_call, ic_call+1);
bool ret = iter.next();
assert(ret == true, "relocInfo must exist at this address");
assert(iter.addr() == ic_call, "must find ic_call");
if (iter.type() == relocInfo::virtual_call_type) {
virtual_call_Relocation* r = iter.virtual_call_reloc();
_is_optimized = false;
_value = nativeMovConstReg_at(r->cached_value());
} else {
assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
_is_optimized = true;
_value = NULL;
}
}
// ----------------------------------------------------------------------------
#define __ _masm.
void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
// Stub is fixed up when the corresponding call is converted from
// calling compiled code to calling interpreted code.
// movq rmethod, 0
// jmp -4 # to self
// address mark = cbuf.insts_mark(); // Get mark within main instrs section.
// 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);
address base = __ start_a_stub(to_interp_stub_size()*2);
int offset = __ offset();
if (base == NULL) return; // CodeBuffer::expand failed
// static stub relocation stores the instruction address of the call
__ relocate(static_stub_Relocation::spec(mark));
// static stub relocation also tags the Method* in the code-stream.
__ mov_metadata(rmethod, (Metadata*)NULL);
__ b(__ pc());
assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");
__ end_a_stub();
}
#undef __
int CompiledStaticCall::to_interp_stub_size() {
// count a mov mem --> to 4 movz/k and a branch
return 6 * NativeInstruction::instruction_size;
}
// Relocation entries for call stub, compiled java to interpreter.
int CompiledStaticCall::reloc_to_interp_stub() {
// TODO fixme
// return a large number
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);
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());
method_holder->flush();
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);
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);
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
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