--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cpu/ppc/vm/interp_masm_ppc_64.cpp	Fri Aug 02 16:46:45 2013 +0200
@@ -0,0 +1,504 @@
+/*
+ * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2012, 2013 SAP AG. 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/assembler.hpp"
+#include "asm/macroAssembler.inline.hpp"
+#include "interp_masm_ppc_64.hpp"
+#include "interpreter/interpreterRuntime.hpp"
+
+
+#ifdef PRODUCT
+#define BLOCK_COMMENT(str) // nothing
+#else
+#define BLOCK_COMMENT(str) block_comment(str)
+#endif
+
+// Lock object
+//
+// Registers alive
+//   monitor - Address of the BasicObjectLock to be used for locking,
+//             which must be initialized with the object to lock.
+//   object  - Address of the object to be locked.
+//
+void InterpreterMacroAssembler::lock_object(Register monitor, Register object) {
+  if (UseHeavyMonitors) {
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
+            monitor, /*check_for_exceptions=*/false);
+  } else {
+    // template code:
+    //
+    // markOop displaced_header = obj->mark().set_unlocked();
+    // monitor->lock()->set_displaced_header(displaced_header);
+    // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
+    //   // We stored the monitor address into the object's mark word.
+    // } else if (THREAD->is_lock_owned((address)displaced_header))
+    //   // Simple recursive case.
+    //   monitor->lock()->set_displaced_header(NULL);
+    // } else {
+    //   // Slow path.
+    //   InterpreterRuntime::monitorenter(THREAD, monitor);
+    // }
+
+    const Register displaced_header = R7_ARG5;
+    const Register object_mark_addr = R8_ARG6;
+    const Register current_header   = R9_ARG7;
+    const Register tmp              = R10_ARG8;
+
+    Label done;
+    Label slow_case;
+
+    assert_different_registers(displaced_header, object_mark_addr, current_header, tmp);
+
+
+    // markOop displaced_header = obj->mark().set_unlocked();
+
+    // Load markOop from object into displaced_header.
+    ld(displaced_header, oopDesc::mark_offset_in_bytes(), object);
+
+    if (UseBiasedLocking) {
+      biased_locking_enter(CCR0, object, displaced_header, tmp, current_header, done, &slow_case);
+    }
+
+    // Set displaced_header to be (markOop of object | UNLOCK_VALUE).
+    ori(displaced_header, displaced_header, markOopDesc::unlocked_value);
+
+
+    // monitor->lock()->set_displaced_header(displaced_header);
+
+    // Initialize the box (Must happen before we update the object mark!).
+    std(displaced_header, BasicObjectLock::lock_offset_in_bytes() +
+            BasicLock::displaced_header_offset_in_bytes(), monitor);
+
+    // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
+
+    // Store stack address of the BasicObjectLock (this is monitor) into object.
+    addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes());
+
+    // Must fence, otherwise, preceding store(s) may float below cmpxchg.
+    // CmpxchgX sets CCR0 to cmpX(current, displaced).
+    fence(); // TODO: replace by MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq ?
+    cmpxchgd(/*flag=*/CCR0,
+             /*current_value=*/current_header,
+             /*compare_value=*/displaced_header, /*exchange_value=*/monitor,
+             /*where=*/object_mark_addr,
+             MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq,
+             MacroAssembler::cmpxchgx_hint_acquire_lock());
+
+    // If the compare-and-exchange succeeded, then we found an unlocked
+    // object and we have now locked it.
+    beq(CCR0, done);
+
+
+    // } else if (THREAD->is_lock_owned((address)displaced_header))
+    //   // Simple recursive case.
+    //   monitor->lock()->set_displaced_header(NULL);
+
+    // We did not see an unlocked object so try the fast recursive case.
+
+    // Check if owner is self by comparing the value in the markOop of object
+    // (current_header) with the stack pointer.
+    sub(current_header, current_header, R1_SP);
+
+    assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
+    load_const_optimized(tmp,
+                         (address) (~(os::vm_page_size()-1) |
+                                    markOopDesc::lock_mask_in_place));
+
+    and_(R0/*==0?*/, current_header, tmp);
+    // If condition is true we are done and hence we can store 0 in the displaced
+    // header indicating it is a recursive lock.
+    bne(CCR0, slow_case);
+    release();
+    std(R0/*==0!*/, BasicObjectLock::lock_offset_in_bytes() +
+            BasicLock::displaced_header_offset_in_bytes(), monitor);
+    b(done);
+
+
+    // } else {
+    //   // Slow path.
+    //   InterpreterRuntime::monitorenter(THREAD, monitor);
+
+    // None of the above fast optimizations worked so we have to get into the
+    // slow case of monitor enter.
+    bind(slow_case);
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
+            monitor, /*check_for_exceptions=*/false);
+    // }
+
+    bind(done);
+  }
+}
+
+// Unlocks an object. Used in monitorexit bytecode and remove_activation.
+//
+// Registers alive
+//   monitor - Address of the BasicObjectLock to be used for locking,
+//             which must be initialized with the object to lock.
+//
+// Throw IllegalMonitorException if object is not locked by current thread.
+void InterpreterMacroAssembler::unlock_object(Register monitor) {
+  if (UseHeavyMonitors) {
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
+            monitor, /*check_for_exceptions=*/false);
+  } else {
+
+    // template code:
+    //
+    // if ((displaced_header = monitor->displaced_header()) == NULL) {
+    //   // Recursive unlock.  Mark the monitor unlocked by setting the object field to NULL.
+    //   monitor->set_obj(NULL);
+    // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {
+    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
+    //   monitor->set_obj(NULL);
+    // } else {
+    //   // Slow path.
+    //   InterpreterRuntime::monitorexit(THREAD, monitor);
+    // }
+
+    const Register object           = R7_ARG5;
+    const Register displaced_header = R8_ARG6;
+    const Register object_mark_addr = R9_ARG7;
+    const Register current_header   = R10_ARG8;
+
+    Label no_recursive_unlock;
+    Label slow_case;
+    Label done;
+
+    assert_different_registers(object, displaced_header, object_mark_addr, current_header);
+
+    if (UseBiasedLocking) {
+      // The object address from the monitor is in object.
+      ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor);
+      assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0");
+      biased_locking_exit(CCR0, object, displaced_header, done);
+    }
+
+    // Test first if we are in the fast recursive case.
+    ld(displaced_header, BasicObjectLock::lock_offset_in_bytes() +
+           BasicLock::displaced_header_offset_in_bytes(), monitor);
+
+    // If the displaced header is zero, we have a recursive unlock.
+    cmpdi(CCR0, displaced_header, 0);
+    bne(CCR0, no_recursive_unlock);
+    // Release in recursive unlock is not necessary.
+    // release();
+    std(displaced_header/*==0!*/, BasicObjectLock::obj_offset_in_bytes(), monitor);
+    b(done);
+
+    bind(no_recursive_unlock);
+
+    // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {
+    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
+    //   monitor->set_obj(NULL);
+
+    // If we still have a lightweight lock, unlock the object and be done.
+
+    // The object address from the monitor is in object.
+    ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor);
+    addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes());
+
+    // We have the displaced header in displaced_header. If the lock is still
+    // lightweight, it will contain the monitor address and we'll store the
+    // displaced header back into the object's mark word.
+    // CmpxchgX sets CCR0 to cmpX(current, monitor).
+    cmpxchgd(/*flag=*/CCR0,
+             /*current_value=*/current_header,
+             /*compare_value=*/monitor, /*exchange_value=*/displaced_header,
+             /*where=*/object_mark_addr,
+             MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq,
+             MacroAssembler::cmpxchgx_hint_release_lock());
+    bne(CCR0, slow_case);
+
+    // Exchange worked, do monitor->set_obj(NULL).
+    li(R0, 0);
+    // Must realease earlier (see cmpxchgd above).
+    // release();
+    std(R0, BasicObjectLock::obj_offset_in_bytes(), monitor);
+    b(done);
+
+
+    // } else {
+    //   // Slow path.
+    //   InterpreterRuntime::monitorexit(THREAD, monitor);
+
+    // The lock has been converted into a heavy lock and hence
+    // we need to get into the slow case.
+    bind(slow_case);
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),
+            monitor, /*check_for_exceptions=*/false);
+    // }
+
+    bind(done);
+  }
+}
+
+void InterpreterMacroAssembler::get_method_counters(Register method,
+                                                    Register Rcounters,
+                                                    Label& skip) {
+  BLOCK_COMMENT("Load and ev. allocate counter object {");
+  Label has_counters;
+  ld(Rcounters, in_bytes(Method::method_counters_offset()), method);
+  cmpdi(CCR0, Rcounters, 0);
+  bne(CCR0, has_counters);
+  call_VM(noreg, CAST_FROM_FN_PTR(address,
+                                  InterpreterRuntime::build_method_counters), method, false);
+  ld(Rcounters, in_bytes(Method::method_counters_offset()), method);
+  cmpdi(CCR0, Rcounters, 0);
+  beq(CCR0, skip); // No MethodCounters, OutOfMemory.
+  BLOCK_COMMENT("} Load and ev. allocate counter object");
+
+  bind(has_counters);
+}
+
+void InterpreterMacroAssembler::increment_invocation_counter(Register Rcounters, Register iv_be_count, Register Rtmp_r0) {
+  assert(UseCompiler, "incrementing must be useful");
+  Register invocation_count = iv_be_count;
+  Register backedge_count   = Rtmp_r0;
+  int delta = InvocationCounter::count_increment;
+
+  // Load each counter in a register.
+  //  ld(inv_counter, Rtmp);
+  //  ld(be_counter, Rtmp2);
+  int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() +
+                                    InvocationCounter::counter_offset());
+  int be_counter_offset  = in_bytes(MethodCounters::backedge_counter_offset() +
+                                    InvocationCounter::counter_offset());
+
+  BLOCK_COMMENT("Increment profiling counters {");
+
+  // Load the backedge counter.
+  lwz(backedge_count, be_counter_offset, Rcounters); // is unsigned int
+  // Mask the backedge counter.
+  Register tmp = invocation_count;
+  li(tmp, InvocationCounter::count_mask_value);
+  andr(backedge_count, tmp, backedge_count); // Cannot use andi, need sign extension of count_mask_value.
+
+  // Load the invocation counter.
+  lwz(invocation_count, inv_counter_offset, Rcounters); // is unsigned int
+  // Add the delta to the invocation counter and store the result.
+  addi(invocation_count, invocation_count, delta);
+  // Store value.
+  stw(invocation_count, inv_counter_offset, Rcounters);
+
+  // Add invocation counter + backedge counter.
+  add(iv_be_count, backedge_count, invocation_count);
+
+  // Note that this macro must leave the backedge_count + invocation_count in
+  // register iv_be_count!
+  BLOCK_COMMENT("} Increment profiling counters");
+}
+
+void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {
+  if (state == atos) { MacroAssembler::verify_oop(reg); }
+}
+
+// Inline assembly for:
+//
+// if (thread is in interp_only_mode) {
+//   InterpreterRuntime::post_method_entry();
+// }
+// if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY ) ||
+//     *jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY2)   ) {
+//   SharedRuntime::jvmpi_method_entry(method, receiver);
+// }
+void InterpreterMacroAssembler::notify_method_entry() {
+  // JVMTI
+  // Whenever JVMTI puts a thread in interp_only_mode, method
+  // entry/exit events are sent for that thread to track stack
+  // depth. If it is possible to enter interp_only_mode we add
+  // the code to check if the event should be sent.
+  if (JvmtiExport::can_post_interpreter_events()) {
+    Label jvmti_post_done;
+
+    lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
+    cmpwi(CCR0, R0, 0);
+    beq(CCR0, jvmti_post_done);
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry),
+            /*check_exceptions=*/false);
+
+    bind(jvmti_post_done);
+  }
+}
+
+
+// Inline assembly for:
+//
+// if (thread is in interp_only_mode) {
+//   // save result
+//   InterpreterRuntime::post_method_exit();
+//   // restore result
+// }
+// if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_EXIT)) {
+//   // save result
+//   SharedRuntime::jvmpi_method_exit();
+//   // restore result
+// }
+//
+// Native methods have their result stored in d_tmp and l_tmp.
+// Java methods have their result stored in the expression stack.
+void InterpreterMacroAssembler::notify_method_exit(bool is_native_method, TosState state) {
+  // JVMTI
+  // Whenever JVMTI puts a thread in interp_only_mode, method
+  // entry/exit events are sent for that thread to track stack
+  // depth. If it is possible to enter interp_only_mode we add
+  // the code to check if the event should be sent.
+  if (JvmtiExport::can_post_interpreter_events()) {
+    Label jvmti_post_done;
+
+    lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
+    cmpwi(CCR0, R0, 0);
+    beq(CCR0, jvmti_post_done);
+    call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit),
+            /*check_exceptions=*/false);
+
+    bind(jvmti_post_done);
+  }
+}
+
+// Convert the current TOP_IJAVA_FRAME into a PARENT_IJAVA_FRAME
+// (using parent_frame_resize) and push a new interpreter
+// TOP_IJAVA_FRAME (using frame_size).
+void InterpreterMacroAssembler::push_interpreter_frame(Register top_frame_size, Register parent_frame_resize,
+                                                       Register tmp1, Register tmp2, Register tmp3,
+                                                       Register tmp4, Register pc) {
+  assert_different_registers(top_frame_size, parent_frame_resize, tmp1, tmp2, tmp3, tmp4);
+  ld(tmp1, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
+  mr(tmp2/*top_frame_sp*/, R1_SP);
+  // Move initial_caller_sp.
+  ld(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP);
+  neg(parent_frame_resize, parent_frame_resize);
+  resize_frame(parent_frame_resize/*-parent_frame_resize*/, tmp3);
+
+  // Set LR in new parent frame.
+  std(tmp1, _abi(lr), R1_SP);
+  // Set top_frame_sp info for new parent frame.
+  std(tmp2, _parent_ijava_frame_abi(top_frame_sp), R1_SP);
+  std(tmp4, _parent_ijava_frame_abi(initial_caller_sp), R1_SP);
+
+  // Push new TOP_IJAVA_FRAME.
+  push_frame(top_frame_size, tmp2);
+
+  get_PC_trash_LR(tmp3);
+  std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
+  // Used for non-initial callers by unextended_sp().
+  std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP);
+}
+
+// Pop the topmost TOP_IJAVA_FRAME and convert the previous
+// PARENT_IJAVA_FRAME back into a TOP_IJAVA_FRAME.
+void InterpreterMacroAssembler::pop_interpreter_frame(Register tmp1, Register tmp2, Register tmp3, Register tmp4) {
+  assert_different_registers(tmp1, tmp2, tmp3, tmp4);
+
+  ld(tmp1/*caller's sp*/, _abi(callers_sp), R1_SP);
+  ld(tmp3, _abi(lr), tmp1);
+
+  ld(tmp4, _parent_ijava_frame_abi(initial_caller_sp), tmp1);
+
+  ld(tmp2/*caller's caller's sp*/, _abi(callers_sp), tmp1);
+  // Merge top frame.
+  std(tmp2, _abi(callers_sp), R1_SP);
+
+  ld(tmp2, _parent_ijava_frame_abi(top_frame_sp), tmp1);
+
+  // Update C stack pointer to caller's top_abi.
+  resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/);
+
+  // Update LR in top_frame.
+  std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
+
+  std(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP);
+
+  // Store the top-frame stack-pointer for c2i adapters.
+  std(R1_SP, _top_ijava_frame_abi(top_frame_sp), R1_SP);
+}
+
+#ifdef CC_INTERP
+// Turn state's interpreter frame into the current TOP_IJAVA_FRAME.
+void InterpreterMacroAssembler::pop_interpreter_frame_to_state(Register state, Register tmp1, Register tmp2, Register tmp3) {
+  assert_different_registers(R14_state, R15_prev_state, tmp1, tmp2, tmp3);
+
+  if (state == R14_state) {
+    ld(tmp1/*state's fp*/, state_(_last_Java_fp));
+    ld(tmp2/*state's sp*/, state_(_last_Java_sp));
+  } else if (state == R15_prev_state) {
+    ld(tmp1/*state's fp*/, prev_state_(_last_Java_fp));
+    ld(tmp2/*state's sp*/, prev_state_(_last_Java_sp));
+  } else {
+    ShouldNotReachHere();
+  }
+
+  // Merge top frames.
+  std(tmp1, _abi(callers_sp), R1_SP);
+
+  // Tmp2 is new SP.
+  // Tmp1 is parent's SP.
+  resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/);
+
+  // Update LR in top_frame.
+  // Must be interpreter frame.
+  get_PC_trash_LR(tmp3);
+  std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
+  // Used for non-initial callers by unextended_sp().
+  std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP);
+}
+#endif // CC_INTERP
+
+// Set SP to initial caller's sp, but before fix the back chain.
+void InterpreterMacroAssembler::resize_frame_to_initial_caller(Register tmp1, Register tmp2) {
+  ld(tmp1, _parent_ijava_frame_abi(initial_caller_sp), R1_SP);
+  ld(tmp2, _parent_ijava_frame_abi(callers_sp), R1_SP);
+  std(tmp2, _parent_ijava_frame_abi(callers_sp), tmp1); // Fix back chain ...
+  mr(R1_SP, tmp1); // ... and resize to initial caller.
+}
+
+#ifdef CC_INTERP
+// Pop the current interpreter state (without popping the correspoding
+// frame) and restore R14_state and R15_prev_state accordingly.
+// Use prev_state_may_be_0 to indicate whether prev_state may be 0
+// in order to generate an extra check before retrieving prev_state_(_prev_link).
+void InterpreterMacroAssembler::pop_interpreter_state(bool prev_state_may_be_0)
+{
+  // Move prev_state to state and restore prev_state from state_(_prev_link).
+  Label prev_state_is_0;
+  mr(R14_state, R15_prev_state);
+
+  // Don't retrieve /*state==*/prev_state_(_prev_link)
+  // if /*state==*/prev_state is 0.
+  if (prev_state_may_be_0) {
+    cmpdi(CCR0, R15_prev_state, 0);
+    beq(CCR0, prev_state_is_0);
+  }
+
+  ld(R15_prev_state, /*state==*/prev_state_(_prev_link));
+  bind(prev_state_is_0);
+}
+
+void InterpreterMacroAssembler::restore_prev_state() {
+  // _prev_link is private, but cInterpreter is a friend.
+  ld(R15_prev_state, state_(_prev_link));
+}
+#endif // CC_INTERP