1bf7f2b9a6
In bcEscapeAnalyzer update the _allocated_escapes flag if a var escapes the method. Reviewed-by: kvn
1487 lines
48 KiB
C++
1487 lines
48 KiB
C++
/*
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* Copyright (c) 2005, 2014, Oracle and/or its affiliates. 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 "ci/bcEscapeAnalyzer.hpp"
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#include "ci/ciConstant.hpp"
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#include "ci/ciField.hpp"
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#include "ci/ciMethodBlocks.hpp"
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#include "ci/ciStreams.hpp"
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#include "interpreter/bytecode.hpp"
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#include "utilities/bitMap.inline.hpp"
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#ifndef PRODUCT
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#define TRACE_BCEA(level, code) \
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if (EstimateArgEscape && BCEATraceLevel >= level) { \
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code; \
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}
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#else
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#define TRACE_BCEA(level, code)
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#endif
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// Maintain a map of which aguments a local variable or
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// stack slot may contain. In addition to tracking
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// arguments, it tracks two special values, "allocated"
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// which represents any object allocated in the current
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// method, and "unknown" which is any other object.
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// Up to 30 arguments are handled, with the last one
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// representing summary information for any extra arguments
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class BCEscapeAnalyzer::ArgumentMap {
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uint _bits;
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enum {MAXBIT = 29,
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ALLOCATED = 1,
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UNKNOWN = 2};
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uint int_to_bit(uint e) const {
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if (e > MAXBIT)
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e = MAXBIT;
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return (1 << (e + 2));
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}
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public:
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ArgumentMap() { _bits = 0;}
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void set_bits(uint bits) { _bits = bits;}
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uint get_bits() const { return _bits;}
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void clear() { _bits = 0;}
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void set_all() { _bits = ~0u; }
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bool is_empty() const { return _bits == 0; }
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bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; }
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bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); }
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bool contains_unknown() const { return (_bits & UNKNOWN) != 0; }
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bool contains_allocated() const { return (_bits & ALLOCATED) != 0; }
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bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; }
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void set(uint var) { _bits = int_to_bit(var); }
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void add(uint var) { _bits |= int_to_bit(var); }
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void add_unknown() { _bits = UNKNOWN; }
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void add_allocated() { _bits = ALLOCATED; }
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void set_union(const ArgumentMap &am) { _bits |= am._bits; }
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void set_intersect(const ArgumentMap &am) { _bits |= am._bits; }
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void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; }
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void operator=(const ArgumentMap &am) { _bits = am._bits; }
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bool operator==(const ArgumentMap &am) { return _bits == am._bits; }
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bool operator!=(const ArgumentMap &am) { return _bits != am._bits; }
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};
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class BCEscapeAnalyzer::StateInfo {
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public:
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ArgumentMap *_vars;
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ArgumentMap *_stack;
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short _stack_height;
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short _max_stack;
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bool _initialized;
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ArgumentMap empty_map;
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StateInfo() {
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empty_map.clear();
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}
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ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; }
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ArgumentMap apop() { return raw_pop(); }
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void spop() { raw_pop(); }
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void lpop() { spop(); spop(); }
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void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; }
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void apush(ArgumentMap i) { raw_push(i); }
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void spush() { raw_push(empty_map); }
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void lpush() { spush(); spush(); }
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};
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void BCEscapeAnalyzer::set_returned(ArgumentMap vars) {
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i))
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_arg_returned.set(i);
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}
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_return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated());
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_return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars());
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}
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// return true if any element of vars is an argument
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bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) {
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i))
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return true;
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}
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return false;
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}
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// return true if any element of vars is an arg_stack argument
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bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){
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if (_conservative)
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return true;
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i) && _arg_stack.test(i))
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return true;
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}
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return false;
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}
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// return true if all argument elements of vars are returned
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bool BCEscapeAnalyzer::returns_all(ArgumentMap vars) {
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i) && !_arg_returned.test(i)) {
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return false;
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}
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}
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return true;
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}
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void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) {
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i)) {
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bm >>= i;
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}
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}
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}
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void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) {
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clear_bits(vars, _arg_local);
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if (vars.contains_allocated()) {
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_allocated_escapes = true;
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}
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}
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void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) {
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clear_bits(vars, _arg_local);
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clear_bits(vars, _arg_stack);
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if (vars.contains_allocated())
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_allocated_escapes = true;
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if (merge && !vars.is_empty()) {
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// Merge new state into already processed block.
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// New state is not taken into account and
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// it may invalidate set_returned() result.
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if (vars.contains_unknown() || vars.contains_allocated()) {
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_return_local = false;
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}
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if (vars.contains_unknown() || vars.contains_vars()) {
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_return_allocated = false;
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}
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if (_return_local && vars.contains_vars() && !returns_all(vars)) {
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// Return result should be invalidated if args in new
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// state are not recorded in return state.
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_return_local = false;
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}
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}
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}
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void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) {
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clear_bits(vars, _dirty);
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}
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void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) {
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for (int i = 0; i < _arg_size; i++) {
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if (vars.contains(i)) {
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set_arg_modified(i, offs, size);
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}
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}
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if (vars.contains_unknown())
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_unknown_modified = true;
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}
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bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) {
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for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) {
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if (scope->method() == callee) {
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return true;
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}
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}
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return false;
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}
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bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) {
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if (offset == OFFSET_ANY)
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return _arg_modified[arg] != 0;
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assert(arg >= 0 && arg < _arg_size, "must be an argument.");
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bool modified = false;
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int l = offset / HeapWordSize;
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int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
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if (l > ARG_OFFSET_MAX)
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l = ARG_OFFSET_MAX;
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if (h > ARG_OFFSET_MAX+1)
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h = ARG_OFFSET_MAX + 1;
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for (int i = l; i < h; i++) {
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modified = modified || (_arg_modified[arg] & (1 << i)) != 0;
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}
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return modified;
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}
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void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) {
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if (offset == OFFSET_ANY) {
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_arg_modified[arg] = (uint) -1;
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return;
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}
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assert(arg >= 0 && arg < _arg_size, "must be an argument.");
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int l = offset / HeapWordSize;
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int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
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if (l > ARG_OFFSET_MAX)
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l = ARG_OFFSET_MAX;
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if (h > ARG_OFFSET_MAX+1)
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h = ARG_OFFSET_MAX + 1;
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for (int i = l; i < h; i++) {
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_arg_modified[arg] |= (1 << i);
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}
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}
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void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) {
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int i;
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// retrieve information about the callee
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ciInstanceKlass* klass = target->holder();
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ciInstanceKlass* calling_klass = method()->holder();
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ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
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ciInstanceKlass* actual_recv = callee_holder;
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// Some methods are obviously bindable without any type checks so
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// convert them directly to an invokespecial or invokestatic.
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if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
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switch (code) {
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case Bytecodes::_invokevirtual:
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code = Bytecodes::_invokespecial;
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break;
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case Bytecodes::_invokehandle:
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code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
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break;
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}
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}
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// compute size of arguments
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int arg_size = target->invoke_arg_size(code);
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int arg_base = MAX2(state._stack_height - arg_size, 0);
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// direct recursive calls are skipped if they can be bound statically without introducing
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// dependencies and if parameters are passed at the same position as in the current method
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// other calls are skipped if there are no unescaped arguments passed to them
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bool directly_recursive = (method() == target) &&
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(code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty());
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// check if analysis of callee can safely be skipped
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bool skip_callee = true;
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for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) {
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ArgumentMap arg = state._stack[i];
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skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base));
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}
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// For now we conservatively skip invokedynamic.
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if (code == Bytecodes::_invokedynamic) {
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skip_callee = true;
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}
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if (skip_callee) {
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TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8()));
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for (i = 0; i < arg_size; i++) {
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set_method_escape(state.raw_pop());
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}
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_unknown_modified = true; // assume the worst since we don't analyze the called method
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return;
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}
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// determine actual method (use CHA if necessary)
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ciMethod* inline_target = NULL;
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if (target->is_loaded() && klass->is_loaded()
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&& (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
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&& target->is_loaded()) {
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if (code == Bytecodes::_invokestatic
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|| code == Bytecodes::_invokespecial
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|| code == Bytecodes::_invokevirtual && target->is_final_method()) {
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inline_target = target;
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} else {
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inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
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}
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}
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if (inline_target != NULL && !is_recursive_call(inline_target)) {
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// analyze callee
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BCEscapeAnalyzer analyzer(inline_target, this);
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// adjust escape state of actual parameters
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bool must_record_dependencies = false;
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for (i = arg_size - 1; i >= 0; i--) {
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ArgumentMap arg = state.raw_pop();
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if (!is_argument(arg))
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continue;
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for (int j = 0; j < _arg_size; j++) {
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if (arg.contains(j)) {
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_arg_modified[j] |= analyzer._arg_modified[i];
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}
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}
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if (!is_arg_stack(arg)) {
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// arguments have already been recognized as escaping
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} else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) {
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set_method_escape(arg);
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must_record_dependencies = true;
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} else {
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set_global_escape(arg);
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}
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}
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_unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects();
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// record dependencies if at least one parameter retained stack-allocatable
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if (must_record_dependencies) {
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if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) {
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_dependencies.append(actual_recv);
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_dependencies.append(inline_target);
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}
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_dependencies.appendAll(analyzer.dependencies());
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}
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} else {
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TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.",
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target->name()->as_utf8()));
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// conservatively mark all actual parameters as escaping globally
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for (i = 0; i < arg_size; i++) {
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ArgumentMap arg = state.raw_pop();
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if (!is_argument(arg))
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continue;
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set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
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set_global_escape(arg);
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}
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_unknown_modified = true; // assume the worst since we don't know the called method
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}
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}
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bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) {
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return ((~arg_set1) | arg_set2) == 0;
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}
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void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) {
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blk->set_processed();
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ciBytecodeStream s(method());
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int limit_bci = blk->limit_bci();
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bool fall_through = false;
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ArgumentMap allocated_obj;
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allocated_obj.add_allocated();
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ArgumentMap unknown_obj;
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unknown_obj.add_unknown();
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ArgumentMap empty_map;
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s.reset_to_bci(blk->start_bci());
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while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) {
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fall_through = true;
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switch (s.cur_bc()) {
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case Bytecodes::_nop:
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break;
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case Bytecodes::_aconst_null:
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state.apush(unknown_obj);
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break;
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case Bytecodes::_iconst_m1:
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case Bytecodes::_iconst_0:
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case Bytecodes::_iconst_1:
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case Bytecodes::_iconst_2:
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case Bytecodes::_iconst_3:
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case Bytecodes::_iconst_4:
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case Bytecodes::_iconst_5:
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case Bytecodes::_fconst_0:
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case Bytecodes::_fconst_1:
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case Bytecodes::_fconst_2:
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case Bytecodes::_bipush:
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case Bytecodes::_sipush:
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state.spush();
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break;
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case Bytecodes::_lconst_0:
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case Bytecodes::_lconst_1:
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case Bytecodes::_dconst_0:
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case Bytecodes::_dconst_1:
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state.lpush();
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break;
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case Bytecodes::_ldc:
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case Bytecodes::_ldc_w:
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case Bytecodes::_ldc2_w:
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{
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// Avoid calling get_constant() which will try to allocate
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// unloaded constant. We need only constant's type.
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int index = s.get_constant_pool_index();
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constantTag tag = s.get_constant_pool_tag(index);
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if (tag.is_long() || tag.is_double()) {
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// Only longs and doubles use 2 stack slots.
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state.lpush();
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} else if (tag.basic_type() == T_OBJECT) {
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state.apush(unknown_obj);
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} else {
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state.spush();
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}
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break;
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}
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case Bytecodes::_aload:
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state.apush(state._vars[s.get_index()]);
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break;
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case Bytecodes::_iload:
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case Bytecodes::_fload:
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case Bytecodes::_iload_0:
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case Bytecodes::_iload_1:
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case Bytecodes::_iload_2:
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case Bytecodes::_iload_3:
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case Bytecodes::_fload_0:
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case Bytecodes::_fload_1:
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case Bytecodes::_fload_2:
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case Bytecodes::_fload_3:
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state.spush();
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break;
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case Bytecodes::_lload:
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case Bytecodes::_dload:
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case Bytecodes::_lload_0:
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case Bytecodes::_lload_1:
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case Bytecodes::_lload_2:
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case Bytecodes::_lload_3:
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case Bytecodes::_dload_0:
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case Bytecodes::_dload_1:
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case Bytecodes::_dload_2:
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case Bytecodes::_dload_3:
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state.lpush();
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break;
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case Bytecodes::_aload_0:
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state.apush(state._vars[0]);
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break;
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case Bytecodes::_aload_1:
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state.apush(state._vars[1]);
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break;
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case Bytecodes::_aload_2:
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state.apush(state._vars[2]);
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break;
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case Bytecodes::_aload_3:
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state.apush(state._vars[3]);
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break;
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case Bytecodes::_iaload:
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case Bytecodes::_faload:
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case Bytecodes::_baload:
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case Bytecodes::_caload:
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case Bytecodes::_saload:
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state.spop();
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set_method_escape(state.apop());
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state.spush();
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|
break;
|
|
case Bytecodes::_laload:
|
|
case Bytecodes::_daload:
|
|
state.spop();
|
|
set_method_escape(state.apop());
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_aaload:
|
|
{ state.spop();
|
|
ArgumentMap array = state.apop();
|
|
set_method_escape(array);
|
|
state.apush(unknown_obj);
|
|
set_dirty(array);
|
|
}
|
|
break;
|
|
case Bytecodes::_istore:
|
|
case Bytecodes::_fstore:
|
|
case Bytecodes::_istore_0:
|
|
case Bytecodes::_istore_1:
|
|
case Bytecodes::_istore_2:
|
|
case Bytecodes::_istore_3:
|
|
case Bytecodes::_fstore_0:
|
|
case Bytecodes::_fstore_1:
|
|
case Bytecodes::_fstore_2:
|
|
case Bytecodes::_fstore_3:
|
|
state.spop();
|
|
break;
|
|
case Bytecodes::_lstore:
|
|
case Bytecodes::_dstore:
|
|
case Bytecodes::_lstore_0:
|
|
case Bytecodes::_lstore_1:
|
|
case Bytecodes::_lstore_2:
|
|
case Bytecodes::_lstore_3:
|
|
case Bytecodes::_dstore_0:
|
|
case Bytecodes::_dstore_1:
|
|
case Bytecodes::_dstore_2:
|
|
case Bytecodes::_dstore_3:
|
|
state.lpop();
|
|
break;
|
|
case Bytecodes::_astore:
|
|
state._vars[s.get_index()] = state.apop();
|
|
break;
|
|
case Bytecodes::_astore_0:
|
|
state._vars[0] = state.apop();
|
|
break;
|
|
case Bytecodes::_astore_1:
|
|
state._vars[1] = state.apop();
|
|
break;
|
|
case Bytecodes::_astore_2:
|
|
state._vars[2] = state.apop();
|
|
break;
|
|
case Bytecodes::_astore_3:
|
|
state._vars[3] = state.apop();
|
|
break;
|
|
case Bytecodes::_iastore:
|
|
case Bytecodes::_fastore:
|
|
case Bytecodes::_bastore:
|
|
case Bytecodes::_castore:
|
|
case Bytecodes::_sastore:
|
|
{
|
|
state.spop();
|
|
state.spop();
|
|
ArgumentMap arr = state.apop();
|
|
set_method_escape(arr);
|
|
set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
|
|
break;
|
|
}
|
|
case Bytecodes::_lastore:
|
|
case Bytecodes::_dastore:
|
|
{
|
|
state.lpop();
|
|
state.spop();
|
|
ArgumentMap arr = state.apop();
|
|
set_method_escape(arr);
|
|
set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize);
|
|
break;
|
|
}
|
|
case Bytecodes::_aastore:
|
|
{
|
|
set_global_escape(state.apop());
|
|
state.spop();
|
|
ArgumentMap arr = state.apop();
|
|
set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize);
|
|
break;
|
|
}
|
|
case Bytecodes::_pop:
|
|
state.raw_pop();
|
|
break;
|
|
case Bytecodes::_pop2:
|
|
state.raw_pop();
|
|
state.raw_pop();
|
|
break;
|
|
case Bytecodes::_dup:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
state.raw_push(w1);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_dup_x1:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
state.raw_push(w1);
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_dup_x2:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
ArgumentMap w3 = state.raw_pop();
|
|
state.raw_push(w1);
|
|
state.raw_push(w3);
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_dup2:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_dup2_x1:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
ArgumentMap w3 = state.raw_pop();
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
state.raw_push(w3);
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_dup2_x2:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
ArgumentMap w3 = state.raw_pop();
|
|
ArgumentMap w4 = state.raw_pop();
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
state.raw_push(w4);
|
|
state.raw_push(w3);
|
|
state.raw_push(w2);
|
|
state.raw_push(w1);
|
|
}
|
|
break;
|
|
case Bytecodes::_swap:
|
|
{ ArgumentMap w1 = state.raw_pop();
|
|
ArgumentMap w2 = state.raw_pop();
|
|
state.raw_push(w1);
|
|
state.raw_push(w2);
|
|
}
|
|
break;
|
|
case Bytecodes::_iadd:
|
|
case Bytecodes::_fadd:
|
|
case Bytecodes::_isub:
|
|
case Bytecodes::_fsub:
|
|
case Bytecodes::_imul:
|
|
case Bytecodes::_fmul:
|
|
case Bytecodes::_idiv:
|
|
case Bytecodes::_fdiv:
|
|
case Bytecodes::_irem:
|
|
case Bytecodes::_frem:
|
|
case Bytecodes::_iand:
|
|
case Bytecodes::_ior:
|
|
case Bytecodes::_ixor:
|
|
state.spop();
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_ladd:
|
|
case Bytecodes::_dadd:
|
|
case Bytecodes::_lsub:
|
|
case Bytecodes::_dsub:
|
|
case Bytecodes::_lmul:
|
|
case Bytecodes::_dmul:
|
|
case Bytecodes::_ldiv:
|
|
case Bytecodes::_ddiv:
|
|
case Bytecodes::_lrem:
|
|
case Bytecodes::_drem:
|
|
case Bytecodes::_land:
|
|
case Bytecodes::_lor:
|
|
case Bytecodes::_lxor:
|
|
state.lpop();
|
|
state.lpop();
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_ishl:
|
|
case Bytecodes::_ishr:
|
|
case Bytecodes::_iushr:
|
|
state.spop();
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_lshl:
|
|
case Bytecodes::_lshr:
|
|
case Bytecodes::_lushr:
|
|
state.spop();
|
|
state.lpop();
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_ineg:
|
|
case Bytecodes::_fneg:
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_lneg:
|
|
case Bytecodes::_dneg:
|
|
state.lpop();
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_iinc:
|
|
break;
|
|
case Bytecodes::_i2l:
|
|
case Bytecodes::_i2d:
|
|
case Bytecodes::_f2l:
|
|
case Bytecodes::_f2d:
|
|
state.spop();
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_i2f:
|
|
case Bytecodes::_f2i:
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_l2i:
|
|
case Bytecodes::_l2f:
|
|
case Bytecodes::_d2i:
|
|
case Bytecodes::_d2f:
|
|
state.lpop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_l2d:
|
|
case Bytecodes::_d2l:
|
|
state.lpop();
|
|
state.lpush();
|
|
break;
|
|
case Bytecodes::_i2b:
|
|
case Bytecodes::_i2c:
|
|
case Bytecodes::_i2s:
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_lcmp:
|
|
case Bytecodes::_dcmpl:
|
|
case Bytecodes::_dcmpg:
|
|
state.lpop();
|
|
state.lpop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_fcmpl:
|
|
case Bytecodes::_fcmpg:
|
|
state.spop();
|
|
state.spop();
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_ifeq:
|
|
case Bytecodes::_ifne:
|
|
case Bytecodes::_iflt:
|
|
case Bytecodes::_ifge:
|
|
case Bytecodes::_ifgt:
|
|
case Bytecodes::_ifle:
|
|
{
|
|
state.spop();
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
break;
|
|
}
|
|
case Bytecodes::_if_icmpeq:
|
|
case Bytecodes::_if_icmpne:
|
|
case Bytecodes::_if_icmplt:
|
|
case Bytecodes::_if_icmpge:
|
|
case Bytecodes::_if_icmpgt:
|
|
case Bytecodes::_if_icmple:
|
|
{
|
|
state.spop();
|
|
state.spop();
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
break;
|
|
}
|
|
case Bytecodes::_if_acmpeq:
|
|
case Bytecodes::_if_acmpne:
|
|
{
|
|
set_method_escape(state.apop());
|
|
set_method_escape(state.apop());
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
break;
|
|
}
|
|
case Bytecodes::_goto:
|
|
{
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_jsr:
|
|
{
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
state.apush(empty_map);
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_ret:
|
|
// we don't track the destination of a "ret" instruction
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_return:
|
|
assert(s.next_bci() == limit_bci, "return must end block");
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_tableswitch:
|
|
{
|
|
state.spop();
|
|
Bytecode_tableswitch sw(&s);
|
|
int len = sw.length();
|
|
int dest_bci;
|
|
for (int i = 0; i < len; i++) {
|
|
dest_bci = s.cur_bci() + sw.dest_offset_at(i);
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
}
|
|
dest_bci = s.cur_bci() + sw.default_offset();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_lookupswitch:
|
|
{
|
|
state.spop();
|
|
Bytecode_lookupswitch sw(&s);
|
|
int len = sw.number_of_pairs();
|
|
int dest_bci;
|
|
for (int i = 0; i < len; i++) {
|
|
dest_bci = s.cur_bci() + sw.pair_at(i).offset();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
}
|
|
dest_bci = s.cur_bci() + sw.default_offset();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_ireturn:
|
|
case Bytecodes::_freturn:
|
|
state.spop();
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_lreturn:
|
|
case Bytecodes::_dreturn:
|
|
state.lpop();
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_areturn:
|
|
set_returned(state.apop());
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_getstatic:
|
|
case Bytecodes::_getfield:
|
|
{ bool ignored_will_link;
|
|
ciField* field = s.get_field(ignored_will_link);
|
|
BasicType field_type = field->type()->basic_type();
|
|
if (s.cur_bc() != Bytecodes::_getstatic) {
|
|
set_method_escape(state.apop());
|
|
}
|
|
if (field_type == T_OBJECT || field_type == T_ARRAY) {
|
|
state.apush(unknown_obj);
|
|
} else if (type2size[field_type] == 1) {
|
|
state.spush();
|
|
} else {
|
|
state.lpush();
|
|
}
|
|
}
|
|
break;
|
|
case Bytecodes::_putstatic:
|
|
case Bytecodes::_putfield:
|
|
{ bool will_link;
|
|
ciField* field = s.get_field(will_link);
|
|
BasicType field_type = field->type()->basic_type();
|
|
if (field_type == T_OBJECT || field_type == T_ARRAY) {
|
|
set_global_escape(state.apop());
|
|
} else if (type2size[field_type] == 1) {
|
|
state.spop();
|
|
} else {
|
|
state.lpop();
|
|
}
|
|
if (s.cur_bc() != Bytecodes::_putstatic) {
|
|
ArgumentMap p = state.apop();
|
|
set_method_escape(p);
|
|
set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize);
|
|
}
|
|
}
|
|
break;
|
|
case Bytecodes::_invokevirtual:
|
|
case Bytecodes::_invokespecial:
|
|
case Bytecodes::_invokestatic:
|
|
case Bytecodes::_invokedynamic:
|
|
case Bytecodes::_invokeinterface:
|
|
{ bool ignored_will_link;
|
|
ciSignature* declared_signature = NULL;
|
|
ciMethod* target = s.get_method(ignored_will_link, &declared_signature);
|
|
ciKlass* holder = s.get_declared_method_holder();
|
|
assert(declared_signature != NULL, "cannot be null");
|
|
// Push appendix argument, if one.
|
|
if (s.has_appendix()) {
|
|
state.apush(unknown_obj);
|
|
}
|
|
// Pass in raw bytecode because we need to see invokehandle instructions.
|
|
invoke(state, s.cur_bc_raw(), target, holder);
|
|
// We are using the return type of the declared signature here because
|
|
// it might be a more concrete type than the one from the target (for
|
|
// e.g. invokedynamic and invokehandle).
|
|
ciType* return_type = declared_signature->return_type();
|
|
if (!return_type->is_primitive_type()) {
|
|
state.apush(unknown_obj);
|
|
} else if (return_type->is_one_word()) {
|
|
state.spush();
|
|
} else if (return_type->is_two_word()) {
|
|
state.lpush();
|
|
}
|
|
}
|
|
break;
|
|
case Bytecodes::_new:
|
|
state.apush(allocated_obj);
|
|
break;
|
|
case Bytecodes::_newarray:
|
|
case Bytecodes::_anewarray:
|
|
state.spop();
|
|
state.apush(allocated_obj);
|
|
break;
|
|
case Bytecodes::_multianewarray:
|
|
{ int i = s.cur_bcp()[3];
|
|
while (i-- > 0) state.spop();
|
|
state.apush(allocated_obj);
|
|
}
|
|
break;
|
|
case Bytecodes::_arraylength:
|
|
set_method_escape(state.apop());
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_athrow:
|
|
set_global_escape(state.apop());
|
|
fall_through = false;
|
|
break;
|
|
case Bytecodes::_checkcast:
|
|
{ ArgumentMap obj = state.apop();
|
|
set_method_escape(obj);
|
|
state.apush(obj);
|
|
}
|
|
break;
|
|
case Bytecodes::_instanceof:
|
|
set_method_escape(state.apop());
|
|
state.spush();
|
|
break;
|
|
case Bytecodes::_monitorenter:
|
|
case Bytecodes::_monitorexit:
|
|
state.apop();
|
|
break;
|
|
case Bytecodes::_wide:
|
|
ShouldNotReachHere();
|
|
break;
|
|
case Bytecodes::_ifnull:
|
|
case Bytecodes::_ifnonnull:
|
|
{
|
|
set_method_escape(state.apop());
|
|
int dest_bci = s.get_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
break;
|
|
}
|
|
case Bytecodes::_goto_w:
|
|
{
|
|
int dest_bci = s.get_far_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_jsr_w:
|
|
{
|
|
int dest_bci = s.get_far_dest();
|
|
assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
|
|
assert(s.next_bci() == limit_bci, "branch must end block");
|
|
state.apush(empty_map);
|
|
successors.push(_methodBlocks->block_containing(dest_bci));
|
|
fall_through = false;
|
|
break;
|
|
}
|
|
case Bytecodes::_breakpoint:
|
|
break;
|
|
default:
|
|
ShouldNotReachHere();
|
|
break;
|
|
}
|
|
|
|
}
|
|
if (fall_through) {
|
|
int fall_through_bci = s.cur_bci();
|
|
if (fall_through_bci < _method->code_size()) {
|
|
assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start.");
|
|
successors.push(_methodBlocks->block_containing(fall_through_bci));
|
|
}
|
|
}
|
|
}
|
|
|
|
void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) {
|
|
StateInfo *d_state = blockstates + dest->index();
|
|
int nlocals = _method->max_locals();
|
|
|
|
// exceptions may cause transfer of control to handlers in the middle of a
|
|
// block, so we don't merge the incoming state of exception handlers
|
|
if (dest->is_handler())
|
|
return;
|
|
if (!d_state->_initialized ) {
|
|
// destination not initialized, just copy
|
|
for (int i = 0; i < nlocals; i++) {
|
|
d_state->_vars[i] = s_state->_vars[i];
|
|
}
|
|
for (int i = 0; i < s_state->_stack_height; i++) {
|
|
d_state->_stack[i] = s_state->_stack[i];
|
|
}
|
|
d_state->_stack_height = s_state->_stack_height;
|
|
d_state->_max_stack = s_state->_max_stack;
|
|
d_state->_initialized = true;
|
|
} else if (!dest->processed()) {
|
|
// we have not yet walked the bytecodes of dest, we can merge
|
|
// the states
|
|
assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
|
|
for (int i = 0; i < nlocals; i++) {
|
|
d_state->_vars[i].set_union(s_state->_vars[i]);
|
|
}
|
|
for (int i = 0; i < s_state->_stack_height; i++) {
|
|
d_state->_stack[i].set_union(s_state->_stack[i]);
|
|
}
|
|
} else {
|
|
// the bytecodes of dest have already been processed, mark any
|
|
// arguments in the source state which are not in the dest state
|
|
// as global escape.
|
|
// Future refinement: we only need to mark these variable to the
|
|
// maximum escape of any variables in dest state
|
|
assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
|
|
ArgumentMap extra_vars;
|
|
for (int i = 0; i < nlocals; i++) {
|
|
ArgumentMap t;
|
|
t = s_state->_vars[i];
|
|
t.set_difference(d_state->_vars[i]);
|
|
extra_vars.set_union(t);
|
|
}
|
|
for (int i = 0; i < s_state->_stack_height; i++) {
|
|
ArgumentMap t;
|
|
//extra_vars |= !d_state->_vars[i] & s_state->_vars[i];
|
|
t.clear();
|
|
t = s_state->_stack[i];
|
|
t.set_difference(d_state->_stack[i]);
|
|
extra_vars.set_union(t);
|
|
}
|
|
set_global_escape(extra_vars, true);
|
|
}
|
|
}
|
|
|
|
void BCEscapeAnalyzer::iterate_blocks(Arena *arena) {
|
|
int numblocks = _methodBlocks->num_blocks();
|
|
int stkSize = _method->max_stack();
|
|
int numLocals = _method->max_locals();
|
|
StateInfo state;
|
|
|
|
int datacount = (numblocks + 1) * (stkSize + numLocals);
|
|
int datasize = datacount * sizeof(ArgumentMap);
|
|
StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo));
|
|
ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize);
|
|
for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap();
|
|
ArgumentMap *dp = statedata;
|
|
state._vars = dp;
|
|
dp += numLocals;
|
|
state._stack = dp;
|
|
dp += stkSize;
|
|
state._initialized = false;
|
|
state._max_stack = stkSize;
|
|
for (int i = 0; i < numblocks; i++) {
|
|
blockstates[i]._vars = dp;
|
|
dp += numLocals;
|
|
blockstates[i]._stack = dp;
|
|
dp += stkSize;
|
|
blockstates[i]._initialized = false;
|
|
blockstates[i]._stack_height = 0;
|
|
blockstates[i]._max_stack = stkSize;
|
|
}
|
|
GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL);
|
|
GrowableArray<ciBlock *> successors(arena, 4, 0, NULL);
|
|
|
|
_methodBlocks->clear_processed();
|
|
|
|
// initialize block 0 state from method signature
|
|
ArgumentMap allVars; // all oop arguments to method
|
|
ciSignature* sig = method()->signature();
|
|
int j = 0;
|
|
ciBlock* first_blk = _methodBlocks->block_containing(0);
|
|
int fb_i = first_blk->index();
|
|
if (!method()->is_static()) {
|
|
// record information for "this"
|
|
blockstates[fb_i]._vars[j].set(j);
|
|
allVars.add(j);
|
|
j++;
|
|
}
|
|
for (int i = 0; i < sig->count(); i++) {
|
|
ciType* t = sig->type_at(i);
|
|
if (!t->is_primitive_type()) {
|
|
blockstates[fb_i]._vars[j].set(j);
|
|
allVars.add(j);
|
|
}
|
|
j += t->size();
|
|
}
|
|
blockstates[fb_i]._initialized = true;
|
|
assert(j == _arg_size, "just checking");
|
|
|
|
ArgumentMap unknown_map;
|
|
unknown_map.add_unknown();
|
|
|
|
worklist.push(first_blk);
|
|
while(worklist.length() > 0) {
|
|
ciBlock *blk = worklist.pop();
|
|
StateInfo *blkState = blockstates + blk->index();
|
|
if (blk->is_handler() || blk->is_ret_target()) {
|
|
// for an exception handler or a target of a ret instruction, we assume the worst case,
|
|
// that any variable could contain any argument
|
|
for (int i = 0; i < numLocals; i++) {
|
|
state._vars[i] = allVars;
|
|
}
|
|
if (blk->is_handler()) {
|
|
state._stack_height = 1;
|
|
} else {
|
|
state._stack_height = blkState->_stack_height;
|
|
}
|
|
for (int i = 0; i < state._stack_height; i++) {
|
|
// ??? should this be unknown_map ???
|
|
state._stack[i] = allVars;
|
|
}
|
|
} else {
|
|
for (int i = 0; i < numLocals; i++) {
|
|
state._vars[i] = blkState->_vars[i];
|
|
}
|
|
for (int i = 0; i < blkState->_stack_height; i++) {
|
|
state._stack[i] = blkState->_stack[i];
|
|
}
|
|
state._stack_height = blkState->_stack_height;
|
|
}
|
|
iterate_one_block(blk, state, successors);
|
|
// if this block has any exception handlers, push them
|
|
// onto successor list
|
|
if (blk->has_handler()) {
|
|
DEBUG_ONLY(int handler_count = 0;)
|
|
int blk_start = blk->start_bci();
|
|
int blk_end = blk->limit_bci();
|
|
for (int i = 0; i < numblocks; i++) {
|
|
ciBlock *b = _methodBlocks->block(i);
|
|
if (b->is_handler()) {
|
|
int ex_start = b->ex_start_bci();
|
|
int ex_end = b->ex_limit_bci();
|
|
if ((ex_start >= blk_start && ex_start < blk_end) ||
|
|
(ex_end > blk_start && ex_end <= blk_end)) {
|
|
successors.push(b);
|
|
}
|
|
DEBUG_ONLY(handler_count++;)
|
|
}
|
|
}
|
|
assert(handler_count > 0, "must find at least one handler");
|
|
}
|
|
// merge computed variable state with successors
|
|
while(successors.length() > 0) {
|
|
ciBlock *succ = successors.pop();
|
|
merge_block_states(blockstates, succ, &state);
|
|
if (!succ->processed())
|
|
worklist.push(succ);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool BCEscapeAnalyzer::do_analysis() {
|
|
Arena* arena = CURRENT_ENV->arena();
|
|
// identify basic blocks
|
|
_methodBlocks = _method->get_method_blocks();
|
|
|
|
iterate_blocks(arena);
|
|
// TEMPORARY
|
|
return true;
|
|
}
|
|
|
|
vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() {
|
|
vmIntrinsics::ID iid = method()->intrinsic_id();
|
|
|
|
if (iid == vmIntrinsics::_getClass ||
|
|
iid == vmIntrinsics::_fillInStackTrace ||
|
|
iid == vmIntrinsics::_hashCode)
|
|
return iid;
|
|
else
|
|
return vmIntrinsics::_none;
|
|
}
|
|
|
|
bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) {
|
|
ArgumentMap arg;
|
|
arg.clear();
|
|
switch (iid) {
|
|
case vmIntrinsics::_getClass:
|
|
_return_local = false;
|
|
break;
|
|
case vmIntrinsics::_fillInStackTrace:
|
|
arg.set(0); // 'this'
|
|
set_returned(arg);
|
|
break;
|
|
case vmIntrinsics::_hashCode:
|
|
// initialized state is correct
|
|
break;
|
|
default:
|
|
assert(false, "unexpected intrinsic");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void BCEscapeAnalyzer::initialize() {
|
|
int i;
|
|
|
|
// clear escape information (method may have been deoptimized)
|
|
methodData()->clear_escape_info();
|
|
|
|
// initialize escape state of object parameters
|
|
ciSignature* sig = method()->signature();
|
|
int j = 0;
|
|
if (!method()->is_static()) {
|
|
_arg_local.set(0);
|
|
_arg_stack.set(0);
|
|
j++;
|
|
}
|
|
for (i = 0; i < sig->count(); i++) {
|
|
ciType* t = sig->type_at(i);
|
|
if (!t->is_primitive_type()) {
|
|
_arg_local.set(j);
|
|
_arg_stack.set(j);
|
|
}
|
|
j += t->size();
|
|
}
|
|
assert(j == _arg_size, "just checking");
|
|
|
|
// start with optimistic assumption
|
|
ciType *rt = _method->return_type();
|
|
if (rt->is_primitive_type()) {
|
|
_return_local = false;
|
|
_return_allocated = false;
|
|
} else {
|
|
_return_local = true;
|
|
_return_allocated = true;
|
|
}
|
|
_allocated_escapes = false;
|
|
_unknown_modified = false;
|
|
}
|
|
|
|
void BCEscapeAnalyzer::clear_escape_info() {
|
|
ciSignature* sig = method()->signature();
|
|
int arg_count = sig->count();
|
|
ArgumentMap var;
|
|
if (!method()->is_static()) {
|
|
arg_count++; // allow for "this"
|
|
}
|
|
for (int i = 0; i < arg_count; i++) {
|
|
set_arg_modified(i, OFFSET_ANY, 4);
|
|
var.clear();
|
|
var.set(i);
|
|
set_modified(var, OFFSET_ANY, 4);
|
|
set_global_escape(var);
|
|
}
|
|
_arg_local.Clear();
|
|
_arg_stack.Clear();
|
|
_arg_returned.Clear();
|
|
_return_local = false;
|
|
_return_allocated = false;
|
|
_allocated_escapes = true;
|
|
_unknown_modified = true;
|
|
}
|
|
|
|
|
|
void BCEscapeAnalyzer::compute_escape_info() {
|
|
int i;
|
|
assert(!methodData()->has_escape_info(), "do not overwrite escape info");
|
|
|
|
vmIntrinsics::ID iid = known_intrinsic();
|
|
|
|
// check if method can be analyzed
|
|
if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized()
|
|
|| _level > MaxBCEAEstimateLevel
|
|
|| method()->code_size() > MaxBCEAEstimateSize)) {
|
|
if (BCEATraceLevel >= 1) {
|
|
tty->print("Skipping method because: ");
|
|
if (method()->is_abstract())
|
|
tty->print_cr("method is abstract.");
|
|
else if (method()->is_native())
|
|
tty->print_cr("method is native.");
|
|
else if (!method()->holder()->is_initialized())
|
|
tty->print_cr("class of method is not initialized.");
|
|
else if (_level > MaxBCEAEstimateLevel)
|
|
tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).",
|
|
_level, (int) MaxBCEAEstimateLevel);
|
|
else if (method()->code_size() > MaxBCEAEstimateSize)
|
|
tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize (%d).",
|
|
method()->code_size(), (int) MaxBCEAEstimateSize);
|
|
else
|
|
ShouldNotReachHere();
|
|
}
|
|
clear_escape_info();
|
|
|
|
return;
|
|
}
|
|
|
|
if (BCEATraceLevel >= 1) {
|
|
tty->print("[EA] estimating escape information for");
|
|
if (iid != vmIntrinsics::_none)
|
|
tty->print(" intrinsic");
|
|
method()->print_short_name();
|
|
tty->print_cr(" (%d bytes)", method()->code_size());
|
|
}
|
|
|
|
bool success;
|
|
|
|
initialize();
|
|
|
|
// Do not scan method if it has no object parameters and
|
|
// does not returns an object (_return_allocated is set in initialize()).
|
|
if (_arg_local.Size() == 0 && !_return_allocated) {
|
|
// Clear all info since method's bytecode was not analysed and
|
|
// set pessimistic escape information.
|
|
clear_escape_info();
|
|
methodData()->set_eflag(MethodData::allocated_escapes);
|
|
methodData()->set_eflag(MethodData::unknown_modified);
|
|
methodData()->set_eflag(MethodData::estimated);
|
|
return;
|
|
}
|
|
|
|
if (iid != vmIntrinsics::_none)
|
|
success = compute_escape_for_intrinsic(iid);
|
|
else {
|
|
success = do_analysis();
|
|
}
|
|
|
|
// don't store interprocedural escape information if it introduces
|
|
// dependencies or if method data is empty
|
|
//
|
|
if (!has_dependencies() && !methodData()->is_empty()) {
|
|
for (i = 0; i < _arg_size; i++) {
|
|
if (_arg_local.test(i)) {
|
|
assert(_arg_stack.test(i), "inconsistent escape info");
|
|
methodData()->set_arg_local(i);
|
|
methodData()->set_arg_stack(i);
|
|
} else if (_arg_stack.test(i)) {
|
|
methodData()->set_arg_stack(i);
|
|
}
|
|
if (_arg_returned.test(i)) {
|
|
methodData()->set_arg_returned(i);
|
|
}
|
|
methodData()->set_arg_modified(i, _arg_modified[i]);
|
|
}
|
|
if (_return_local) {
|
|
methodData()->set_eflag(MethodData::return_local);
|
|
}
|
|
if (_return_allocated) {
|
|
methodData()->set_eflag(MethodData::return_allocated);
|
|
}
|
|
if (_allocated_escapes) {
|
|
methodData()->set_eflag(MethodData::allocated_escapes);
|
|
}
|
|
if (_unknown_modified) {
|
|
methodData()->set_eflag(MethodData::unknown_modified);
|
|
}
|
|
methodData()->set_eflag(MethodData::estimated);
|
|
}
|
|
}
|
|
|
|
void BCEscapeAnalyzer::read_escape_info() {
|
|
assert(methodData()->has_escape_info(), "no escape info available");
|
|
|
|
// read escape information from method descriptor
|
|
for (int i = 0; i < _arg_size; i++) {
|
|
if (methodData()->is_arg_local(i))
|
|
_arg_local.set(i);
|
|
if (methodData()->is_arg_stack(i))
|
|
_arg_stack.set(i);
|
|
if (methodData()->is_arg_returned(i))
|
|
_arg_returned.set(i);
|
|
_arg_modified[i] = methodData()->arg_modified(i);
|
|
}
|
|
_return_local = methodData()->eflag_set(MethodData::return_local);
|
|
_return_allocated = methodData()->eflag_set(MethodData::return_allocated);
|
|
_allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes);
|
|
_unknown_modified = methodData()->eflag_set(MethodData::unknown_modified);
|
|
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
void BCEscapeAnalyzer::dump() {
|
|
tty->print("[EA] estimated escape information for");
|
|
method()->print_short_name();
|
|
tty->print_cr(has_dependencies() ? " (not stored)" : "");
|
|
tty->print(" non-escaping args: ");
|
|
_arg_local.print_on(tty);
|
|
tty->print(" stack-allocatable args: ");
|
|
_arg_stack.print_on(tty);
|
|
if (_return_local) {
|
|
tty->print(" returned args: ");
|
|
_arg_returned.print_on(tty);
|
|
} else if (is_return_allocated()) {
|
|
tty->print_cr(" return allocated value");
|
|
} else {
|
|
tty->print_cr(" return non-local value");
|
|
}
|
|
tty->print(" modified args: ");
|
|
for (int i = 0; i < _arg_size; i++) {
|
|
if (_arg_modified[i] == 0)
|
|
tty->print(" 0");
|
|
else
|
|
tty->print(" 0x%x", _arg_modified[i]);
|
|
}
|
|
tty->cr();
|
|
tty->print(" flags: ");
|
|
if (_return_allocated)
|
|
tty->print(" return_allocated");
|
|
if (_allocated_escapes)
|
|
tty->print(" allocated_escapes");
|
|
if (_unknown_modified)
|
|
tty->print(" unknown_modified");
|
|
tty->cr();
|
|
}
|
|
#endif
|
|
|
|
BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent)
|
|
: _conservative(method == NULL || !EstimateArgEscape)
|
|
, _arena(CURRENT_ENV->arena())
|
|
, _method(method)
|
|
, _methodData(method ? method->method_data() : NULL)
|
|
, _arg_size(method ? method->arg_size() : 0)
|
|
, _arg_local(_arena)
|
|
, _arg_stack(_arena)
|
|
, _arg_returned(_arena)
|
|
, _dirty(_arena)
|
|
, _return_local(false)
|
|
, _return_allocated(false)
|
|
, _allocated_escapes(false)
|
|
, _unknown_modified(false)
|
|
, _dependencies(_arena, 4, 0, NULL)
|
|
, _parent(parent)
|
|
, _level(parent == NULL ? 0 : parent->level() + 1) {
|
|
if (!_conservative) {
|
|
_arg_local.Clear();
|
|
_arg_stack.Clear();
|
|
_arg_returned.Clear();
|
|
_dirty.Clear();
|
|
Arena* arena = CURRENT_ENV->arena();
|
|
_arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint));
|
|
Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint));
|
|
|
|
if (methodData() == NULL)
|
|
return;
|
|
bool printit = _method->should_print_assembly();
|
|
if (methodData()->has_escape_info()) {
|
|
TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s",
|
|
method->holder()->name()->as_utf8(),
|
|
method->name()->as_utf8()));
|
|
read_escape_info();
|
|
} else {
|
|
TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s",
|
|
method->holder()->name()->as_utf8(),
|
|
method->name()->as_utf8()));
|
|
|
|
compute_escape_info();
|
|
methodData()->update_escape_info();
|
|
}
|
|
#ifndef PRODUCT
|
|
if (BCEATraceLevel >= 3) {
|
|
// dump escape information
|
|
dump();
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) {
|
|
if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) {
|
|
// Also record evol dependencies so redefinition of the
|
|
// callee will trigger recompilation.
|
|
deps->assert_evol_method(method());
|
|
}
|
|
for (int i = 0; i < _dependencies.length(); i+=2) {
|
|
ciKlass *k = _dependencies.at(i)->as_klass();
|
|
ciMethod *m = _dependencies.at(i+1)->as_method();
|
|
deps->assert_unique_concrete_method(k, m);
|
|
}
|
|
}
|