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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2016 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "interpreter/interpreter.hpp"
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#include "oops/constMethod.hpp"
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#include "oops/method.hpp"
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#include "runtime/frame.inline.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/macros.hpp"
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int AbstractInterpreter::BasicType_as_index(BasicType type) {
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int i = 0;
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switch (type) {
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case T_BOOLEAN: i = 0; break;
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case T_CHAR : i = 1; break;
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case T_BYTE : i = 2; break;
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case T_SHORT : i = 3; break;
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case T_INT : i = 4; break;
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case T_LONG : i = 5; break;
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case T_VOID : i = 6; break;
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case T_FLOAT : i = 7; break;
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case T_DOUBLE : i = 8; break;
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case T_OBJECT : i = 9; break;
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case T_ARRAY : i = 9; break;
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default : ShouldNotReachHere();
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}
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assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");
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return i;
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}
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bool AbstractInterpreter::can_be_compiled(methodHandle m) {
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// No special entry points that preclude compilation.
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return true;
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}
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// How much stack a method top interpreter activation needs in words.
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int AbstractInterpreter::size_top_interpreter_activation(Method* method) {
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// We have to size the following 2 frames:
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//
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// [TOP_IJAVA_FRAME_ABI]
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// [ENTRY_FRAME]
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//
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// This expands to (see frame_s390.hpp):
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//
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// [TOP_IJAVA_FRAME_ABI]
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// [operand stack] > stack
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// [monitors] (optional) > monitors
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// [IJAVA_STATE] > interpreter_state
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// [PARENT_IJAVA_FRAME_ABI]
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// [callee's locals w/o arguments] \ locals
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// [outgoing arguments] /
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// [ENTRY_FRAME_LOCALS]
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int locals = method->max_locals() * BytesPerWord;
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int interpreter_state = frame::z_ijava_state_size;
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int stack = method->max_stack() * BytesPerWord;
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int monitors = method->is_synchronized() ? frame::interpreter_frame_monitor_size_in_bytes() : 0;
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int total_bytes =
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frame::z_top_ijava_frame_abi_size +
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stack +
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monitors +
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interpreter_state +
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frame::z_parent_ijava_frame_abi_size +
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locals +
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frame::z_entry_frame_locals_size;
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return (total_bytes/BytesPerWord);
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}
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// Returns number of stackElementWords needed for the interpreter frame with the
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// given sections.
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// This overestimates the stack by one slot in case of alignments.
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int AbstractInterpreter::size_activation(int max_stack,
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int temps,
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int extra_args,
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int monitors,
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int callee_params,
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int callee_locals,
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bool is_top_frame) {
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// Note: This calculation must exactly parallel the frame setup
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// in AbstractInterpreterGenerator::generate_method_entry.
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assert((Interpreter::stackElementSize == frame::alignment_in_bytes), "must align frame size");
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const int abi_scratch = is_top_frame ? (frame::z_top_ijava_frame_abi_size / Interpreter::stackElementSize) :
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(frame::z_parent_ijava_frame_abi_size / Interpreter::stackElementSize);
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const int size =
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max_stack +
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(callee_locals - callee_params) + // Already counted in max_stack().
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monitors * frame::interpreter_frame_monitor_size() +
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abi_scratch +
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frame::z_ijava_state_size / Interpreter::stackElementSize;
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// Fixed size of an interpreter frame.
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return size;
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}
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// Fills a sceletal interpreter frame generated during deoptimizations.
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//
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// Parameters:
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//
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// interpreter_frame != NULL:
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// set up the method, locals, and monitors.
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// The frame interpreter_frame, if not NULL, is guaranteed to be the
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// right size, as determined by a previous call to this method.
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// It is also guaranteed to be walkable even though it is in a skeletal state
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//
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// is_top_frame == true:
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// We're processing the *oldest* interpreter frame!
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//
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// pop_frame_extra_args:
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// If this is != 0 we are returning to a deoptimized frame by popping
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// off the callee frame. We want to re-execute the call that called the
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// callee interpreted, but since the return to the interpreter would pop
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// the arguments off advance the esp by dummy popframe_extra_args slots.
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// Popping off those will establish the stack layout as it was before the call.
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//
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void AbstractInterpreter::layout_activation(Method* method,
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int tempcount,
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int popframe_extra_args,
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int moncount,
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int caller_actual_parameters,
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int callee_param_count,
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int callee_locals_count,
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frame* caller,
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frame* interpreter_frame,
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bool is_top_frame,
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bool is_bottom_frame) {
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// TOP_IJAVA_FRAME:
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//
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// 0 [TOP_IJAVA_FRAME_ABI] -+
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// 16 [operand stack] | size
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// [monitors] (optional) |
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// [IJAVA_STATE] -+
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// Note: own locals are located in the caller frame.
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//
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// PARENT_IJAVA_FRAME:
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//
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// 0 [PARENT_IJAVA_FRAME_ABI] -+
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// [callee's locals w/o arguments] |
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// [outgoing arguments] | size
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// [used part of operand stack w/o arguments] |
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// [monitors] (optional) |
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// [IJAVA_STATE] -+
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//
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// Now we know our caller, calc the exact frame layout and size
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// z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0).
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intptr_t* locals_base = (caller->is_interpreted_frame())
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? (caller->interpreter_frame_tos_address() + caller_actual_parameters - 1)
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: (caller->sp() + method->max_locals() - 1 +
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frame::z_parent_ijava_frame_abi_size / Interpreter::stackElementSize);
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intptr_t* monitor_base = (intptr_t*)((address)interpreter_frame->fp() - frame::z_ijava_state_size);
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intptr_t* monitor = monitor_base - (moncount * frame::interpreter_frame_monitor_size());
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intptr_t* operand_stack_base = monitor;
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intptr_t* tos = operand_stack_base - tempcount - popframe_extra_args;
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intptr_t* top_frame_sp =
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operand_stack_base - method->max_stack() - frame::z_top_ijava_frame_abi_size / Interpreter::stackElementSize;
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intptr_t* sender_sp;
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if (caller->is_interpreted_frame()) {
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sender_sp = caller->interpreter_frame_top_frame_sp();
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} else if (caller->is_compiled_frame()) {
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sender_sp = caller->fp() - caller->cb()->frame_size();
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// The bottom frame's sender_sp is its caller's unextended_sp.
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// It was already set when its skeleton was pushed (see push_skeleton_frames()).
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// Note: the unextended_sp is required by nmethod::orig_pc_addr().
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assert(is_bottom_frame && (sender_sp == caller->unextended_sp()),
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"must initialize sender_sp of bottom skeleton frame when pushing it");
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} else {
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assert(caller->is_entry_frame(), "is there a new frame type??");
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sender_sp = caller->sp(); // Call_stub only uses it's fp.
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}
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interpreter_frame->interpreter_frame_set_method(method);
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interpreter_frame->interpreter_frame_set_mirror(method->method_holder()->java_mirror());
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interpreter_frame->interpreter_frame_set_locals(locals_base);
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interpreter_frame->interpreter_frame_set_monitor_end((BasicObjectLock *)monitor);
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*interpreter_frame->interpreter_frame_cache_addr() = method->constants()->cache();
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interpreter_frame->interpreter_frame_set_tos_address(tos);
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interpreter_frame->interpreter_frame_set_sender_sp(sender_sp);
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interpreter_frame->interpreter_frame_set_top_frame_sp(top_frame_sp);
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}
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