/*
* Copyright 1999-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
class MemoryBuffer;
class GraphBuilder VALUE_OBJ_CLASS_SPEC {
private:
// Per-scope data. These are pushed and popped as we descend into
// inlined methods. Currently in order to generate good code in the
// inliner we have to attempt to inline methods directly into the
// basic block we are parsing; this adds complexity.
class ScopeData: public CompilationResourceObj {
private:
ScopeData* _parent;
// bci-to-block mapping
BlockList* _bci2block;
// Scope
IRScope* _scope;
// Whether this scope or any parent scope has exception handlers
bool _has_handler;
// The bytecodes
ciBytecodeStream* _stream;
// Work list
BlockList* _work_list;
// Maximum inline size for this scope
intx _max_inline_size;
// Expression stack depth at point where inline occurred
int _caller_stack_size;
// The continuation point for the inline. Currently only used in
// multi-block inlines, but eventually would like to use this for
// all inlines for uniformity and simplicity; in this case would
// get the continuation point from the BlockList instead of
// fabricating it anew because Invokes would be considered to be
// BlockEnds.
BlockBegin* _continuation;
// Without return value of inlined method on stack
ValueStack* _continuation_state;
// Was this ScopeData created only for the parsing and inlining of
// a jsr?
bool _parsing_jsr;
// We track the destination bci of the jsr only to determine
// bailout conditions, since we only handle a subset of all of the
// possible jsr-ret control structures. Recursive invocations of a
// jsr are disallowed by the verifier.
int _jsr_entry_bci;
// We need to track the local variable in which the return address
// was stored to ensure we can handle inlining the jsr, because we
// don't handle arbitrary jsr/ret constructs.
int _jsr_ret_addr_local;
// If we are parsing a jsr, the continuation point for rets
BlockBegin* _jsr_continuation;
// Cloned XHandlers for jsr-related ScopeDatas
XHandlers* _jsr_xhandlers;
// Number of returns seen in this scope
int _num_returns;
// In order to generate profitable code for inlining, we currently
// have to perform an optimization for single-block inlined
// methods where we continue parsing into the same block. This
// allows us to perform CSE across inlined scopes and to avoid
// storing parameters to the stack. Having a global register
// allocator and being able to perform global CSE would allow this
// code to be removed and thereby simplify the inliner.
BlockBegin* _cleanup_block; // The block to which the return was added
Instruction* _cleanup_return_prev; // Instruction before return instruction
ValueStack* _cleanup_state; // State of that block (not yet pinned)
public:
ScopeData(ScopeData* parent);
ScopeData* parent() const { return _parent; }
BlockList* bci2block() const { return _bci2block; }
void set_bci2block(BlockList* bci2block) { _bci2block = bci2block; }
// NOTE: this has a different effect when parsing jsrs
BlockBegin* block_at(int bci);
IRScope* scope() const { return _scope; }
// Has side-effect of setting has_handler flag
void set_scope(IRScope* scope);
// Whether this or any parent scope has exception handlers
bool has_handler() const { return _has_handler; }
void set_has_handler() { _has_handler = true; }
// Exception handlers list to be used for this scope
XHandlers* xhandlers() const;
// How to get a block to be parsed
void add_to_work_list(BlockBegin* block);
// How to remove the next block to be parsed; returns NULL if none left
BlockBegin* remove_from_work_list();
// Indicates parse is over
bool is_work_list_empty() const;
ciBytecodeStream* stream() { return _stream; }
void set_stream(ciBytecodeStream* stream) { _stream = stream; }
intx max_inline_size() const { return _max_inline_size; }
int caller_stack_size() const;
BlockBegin* continuation() const { return _continuation; }
void set_continuation(BlockBegin* cont) { _continuation = cont; }
ValueStack* continuation_state() const { return _continuation_state; }
void set_continuation_state(ValueStack* s) { _continuation_state = s; }
// Indicates whether this ScopeData was pushed only for the
// parsing and inlining of a jsr
bool parsing_jsr() const { return _parsing_jsr; }
void set_parsing_jsr() { _parsing_jsr = true; }
int jsr_entry_bci() const { return _jsr_entry_bci; }
void set_jsr_entry_bci(int bci) { _jsr_entry_bci = bci; }
void set_jsr_return_address_local(int local_no){ _jsr_ret_addr_local = local_no; }
int jsr_return_address_local() const { return _jsr_ret_addr_local; }
// Must be called after scope is set up for jsr ScopeData
void setup_jsr_xhandlers();
// The jsr continuation is only used when parsing_jsr is true, and
// is different from the "normal" continuation since we can end up
// doing a return (rather than a ret) from within a subroutine
BlockBegin* jsr_continuation() const { return _jsr_continuation; }
void set_jsr_continuation(BlockBegin* cont) { _jsr_continuation = cont; }
int num_returns();
void incr_num_returns();
void set_inline_cleanup_info(BlockBegin* block,
Instruction* return_prev,
ValueStack* return_state);
BlockBegin* inline_cleanup_block() const { return _cleanup_block; }
Instruction* inline_cleanup_return_prev() const{ return _cleanup_return_prev; }
ValueStack* inline_cleanup_state() const { return _cleanup_state; }
};
// for all GraphBuilders
static bool _is_initialized; // true if trap tables were initialized, false otherwise
static bool _can_trap[Bytecodes::number_of_java_codes];
static bool _is_async[Bytecodes::number_of_java_codes];
// for each instance of GraphBuilder
ScopeData* _scope_data; // Per-scope data; used for inlining
Compilation* _compilation; // the current compilation
ValueMap* _vmap; // the map of values encountered (for CSE)
MemoryBuffer* _memory;
const char* _inline_bailout_msg; // non-null if most recent inline attempt failed
int _instruction_count; // for bailing out in pathological jsr/ret cases
BlockBegin* _start; // the start block
BlockBegin* _osr_entry; // the osr entry block block
ValueStack* _initial_state; // The state for the start block
// for each call to connect_to_end; can also be set by inliner
BlockBegin* _block; // the current block
ValueStack* _state; // the current execution state
ValueStack* _exception_state; // state that will be used by handle_exception
Instruction* _last; // the last instruction added
bool _skip_block; // skip processing of the rest of this block
// accessors
ScopeData* scope_data() const { return _scope_data; }
Compilation* compilation() const { return _compilation; }
BlockList* bci2block() const { return scope_data()->bci2block(); }
ValueMap* vmap() const { assert(UseLocalValueNumbering, "should not access otherwise"); return _vmap; }
bool has_handler() const { return scope_data()->has_handler(); }
BlockBegin* block() const { return _block; }
ValueStack* state() const { return _state; }
void set_state(ValueStack* state) { _state = state; }
IRScope* scope() const { return scope_data()->scope(); }
ValueStack* exception_state() const { return _exception_state; }
void set_exception_state(ValueStack* s) { _exception_state = s; }
ciMethod* method() const { return scope()->method(); }
ciBytecodeStream* stream() const { return scope_data()->stream(); }
Instruction* last() const { return _last; }
Bytecodes::Code code() const { return stream()->cur_bc(); }
int bci() const { return stream()->cur_bci(); }
int next_bci() const { return stream()->next_bci(); }
// unified bailout support
void bailout(const char* msg) const { compilation()->bailout(msg); }
bool bailed_out() const { return compilation()->bailed_out(); }
// stack manipulation helpers
void ipush(Value t) const { state()->ipush(t); }
void lpush(Value t) const { state()->lpush(t); }
void fpush(Value t) const { state()->fpush(t); }
void dpush(Value t) const { state()->dpush(t); }
void apush(Value t) const { state()->apush(t); }
void push(ValueType* type, Value t) const { state()-> push(type, t); }
Value ipop() { return state()->ipop(); }
Value lpop() { return state()->lpop(); }
Value fpop() { return state()->fpop(); }
Value dpop() { return state()->dpop(); }
Value apop() { return state()->apop(); }
Value pop(ValueType* type) { return state()-> pop(type); }
// instruction helpers
void load_constant();
void load_local(ValueType* type, int index);
void store_local(ValueType* type, int index);
void store_local(ValueStack* state, Value value, ValueType* type, int index);
void load_indexed (BasicType type);
void store_indexed(BasicType type);
void stack_op(Bytecodes::Code code);
void arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* lock_stack = NULL);
void negate_op(ValueType* type);
void shift_op(ValueType* type, Bytecodes::Code code);
void logic_op(ValueType* type, Bytecodes::Code code);
void compare_op(ValueType* type, Bytecodes::Code code);
void convert(Bytecodes::Code op, BasicType from, BasicType to);
void increment();
void _goto(int from_bci, int to_bci);
void if_node(Value x, If::Condition cond, Value y, ValueStack* stack_before);
void if_zero(ValueType* type, If::Condition cond);
void if_null(ValueType* type, If::Condition cond);
void if_same(ValueType* type, If::Condition cond);
void jsr(int dest);
void ret(int local_index);
void table_switch();
void lookup_switch();
void method_return(Value x);
void call_register_finalizer();
void access_field(Bytecodes::Code code);
void invoke(Bytecodes::Code code);
void new_instance(int klass_index);
void new_type_array();
void new_object_array();
void check_cast(int klass_index);
void instance_of(int klass_index);
void monitorenter(Value x, int bci);
void monitorexit(Value x, int bci);
void new_multi_array(int dimensions);
void throw_op(int bci);
Value round_fp(Value fp_value);
// stack/code manipulation helpers
Instruction* append_with_bci(Instruction* instr, int bci);
Instruction* append(Instruction* instr);
Instruction* append_split(StateSplit* instr);
// other helpers
static bool is_initialized() { return _is_initialized; }
static bool is_async(Bytecodes::Code code) {
assert(0 <= code && code < Bytecodes::number_of_java_codes, "illegal bytecode");
return _is_async[code];
}
BlockBegin* block_at(int bci) { return scope_data()->block_at(bci); }
XHandlers* handle_exception(int bci);
void connect_to_end(BlockBegin* beg);
void null_check(Value value);
void eliminate_redundant_phis(BlockBegin* start);
BlockEnd* iterate_bytecodes_for_block(int bci);
void iterate_all_blocks(bool start_in_current_block_for_inlining = false);
Dependencies* dependency_recorder() const; // = compilation()->dependencies()
bool direct_compare(ciKlass* k);
void kill_field(ciField* field);
void kill_array(Value value);
void kill_all();
ValueStack* lock_stack();
//
// Inlining support
//
// accessors
bool parsing_jsr() const { return scope_data()->parsing_jsr(); }
BlockBegin* continuation() const { return scope_data()->continuation(); }
ValueStack* continuation_state() const { return scope_data()->continuation_state(); }
BlockBegin* jsr_continuation() const { return scope_data()->jsr_continuation(); }
int caller_stack_size() const { return scope_data()->caller_stack_size(); }
void set_continuation(BlockBegin* continuation) { scope_data()->set_continuation(continuation); }
void set_inline_cleanup_info(BlockBegin* block,
Instruction* return_prev,
ValueStack* return_state) { scope_data()->set_inline_cleanup_info(block,
return_prev,
return_state); }
BlockBegin* inline_cleanup_block() const { return scope_data()->inline_cleanup_block(); }
Instruction* inline_cleanup_return_prev() const { return scope_data()->inline_cleanup_return_prev(); }
ValueStack* inline_cleanup_state() const { return scope_data()->inline_cleanup_state(); }
void incr_num_returns() { scope_data()->incr_num_returns(); }
int num_returns() const { return scope_data()->num_returns(); }
intx max_inline_size() const { return scope_data()->max_inline_size(); }
int inline_level() const { return scope()->level(); }
int recursive_inline_level(ciMethod* callee) const;
// inlining of synchronized methods
void inline_sync_entry(Value lock, BlockBegin* sync_handler);
void fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler = false);
// inliners
bool try_inline(ciMethod* callee, bool holder_known);
bool try_inline_intrinsics(ciMethod* callee);
bool try_inline_full (ciMethod* callee, bool holder_known);
bool try_inline_jsr(int jsr_dest_bci);
// helpers
void inline_bailout(const char* msg);
BlockBegin* header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state);
BlockBegin* setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* init_state);
void setup_osr_entry_block();
void clear_inline_bailout();
ValueStack* state_at_entry();
void push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start);
void push_scope(ciMethod* callee, BlockBegin* continuation);
void push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci);
void pop_scope();
void pop_scope_for_jsr();
bool append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile);
bool append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile);
bool append_unsafe_get_raw(ciMethod* callee, BasicType t);
bool append_unsafe_put_raw(ciMethod* callee, BasicType t);
bool append_unsafe_prefetch(ciMethod* callee, bool is_store, bool is_static);
void append_unsafe_CAS(ciMethod* callee);
NOT_PRODUCT(void print_inline_result(ciMethod* callee, bool res);)
// methodDataOop profiling helpers
void profile_call(Value recv, ciKlass* predicted_holder);
void profile_invocation(ciMethod* method);
void profile_bci(int bci);
// Helpers for generation of profile information
bool profile_branches() {
return _compilation->env()->comp_level() == CompLevel_fast_compile &&
Tier1UpdateMethodData && Tier1ProfileBranches;
}
bool profile_calls() {
return _compilation->env()->comp_level() == CompLevel_fast_compile &&
Tier1UpdateMethodData && Tier1ProfileCalls;
}
bool profile_inlined_calls() {
return profile_calls() && Tier1ProfileInlinedCalls;
}
bool profile_checkcasts() {
return _compilation->env()->comp_level() == CompLevel_fast_compile &&
Tier1UpdateMethodData && Tier1ProfileCheckcasts;
}
public:
NOT_PRODUCT(void print_stats();)
// initialization
static void initialize();
// public
static bool can_trap(ciMethod* method, Bytecodes::Code code) {
assert(0 <= code && code < Bytecodes::number_of_java_codes, "illegal bytecode");
if (_can_trap[code]) return true;
// special handling for finalizer registration
return code == Bytecodes::_return && method->intrinsic_id() == vmIntrinsics::_Object_init;
}
// creation
GraphBuilder(Compilation* compilation, IRScope* scope);
static void sort_top_into_worklist(BlockList* worklist, BlockBegin* top);
BlockBegin* start() const { return _start; }
};