--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/x86/vm/compiledIC_x86.cpp Wed Apr 24 20:55:28 2013 -0400
@@ -0,0 +1,180 @@
+/*
+ * 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) {
+ // Stub is fixed up when the corresponding call is converted from
+ // calling compiled code to calling interpreted code.
+ // movq rbx, 0
+ // jmp -5 # 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);
+ if (base == NULL) return; // CodeBuffer::expand failed.
+ // Static stub relocation stores the instruction address of the call.
+ __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
+ // Static stub relocation also tags the Method* in the code-stream.
+ __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time.
+ // This is recognized as unresolved by relocs/nativeinst/ic code.
+ __ jump(RuntimeAddress(__ pc()));
+
+ // Update current stubs pointer and restore insts_end.
+ __ end_a_stub();
+}
+#undef __
+
+int CompiledStaticCall::to_interp_stub_size() {
+ return NOT_LP64(10) // movl; jmp
+ LP64_ONLY(15); // movq (1+1+8); jmp (1+4)
+}
+
+// Relocation entries for call stub, compiled java to interpreter.
+int CompiledStaticCall::reloc_to_interp_stub() {
+ return 4; // 3 in emit_to_interp_stub + 1 in emit_call
+}
+
+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",
+ 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());
+ 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