truffle: src/share/vm/oops/methodDataOop.hpp comparison

comparison src/share/vm/oops/methodDataOop.hpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	48a3fa21394b

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+:a61af66fc99e
+/*
+* Copyright 2000-2007 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 BytecodeStream;
+// The MethodData object collects counts and other profile information
+// during zeroth-tier (interpretive) and first-tier execution.
+// The profile is used later by compilation heuristics.  Some heuristics
+// enable use of aggressive (or "heroic") optimizations.  An aggressive
+// optimization often has a down-side, a corner case that it handles
+// poorly, but which is thought to be rare.  The profile provides
+// evidence of this rarity for a given method or even BCI.  It allows
+// the compiler to back out of the optimization at places where it
+// has historically been a poor choice.  Other heuristics try to use
+// specific information gathered about types observed at a given site.
+//
+// All data in the profile is approximate.  It is expected to be accurate
+// on the whole, but the system expects occasional inaccuraces, due to
+// counter overflow, multiprocessor races during data collection, space
+// limitations, missing MDO blocks, etc.  Bad or missing data will degrade
+// optimization quality but will not affect correctness.  Also, each MDO
+// is marked with its birth-date ("creation_mileage") which can be used
+// to assess the quality ("maturity") of its data.
+//
+// Short (<32-bit) counters are designed to overflow to a known "saturated"
+// state.  Also, certain recorded per-BCI events are given one-bit counters
+// which overflow to a saturated state which applied to all counters at
+// that BCI.  In other words, there is a small lattice which approximates
+// the ideal of an infinite-precision counter for each event at each BCI,
+// and the lattice quickly "bottoms out" in a state where all counters
+// are taken to be indefinitely large.
+//
+// The reader will find many data races in profile gathering code, starting
+// with invocation counter incrementation.  None of these races harm correct
+// execution of the compiled code.
+// DataLayout
+//
+// Overlay for generic profiling data.
+class DataLayout VALUE_OBJ_CLASS_SPEC {
+private:
+// Every data layout begins with a header.  This header
+// contains a tag, which is used to indicate the size/layout
+// of the data, 4 bits of flags, which can be used in any way,
+// 4 bits of trap history (none/one reason/many reasons),
+// and a bci, which is used to tie this piece of data to a
+// specific bci in the bytecodes.
+union {
+intptr_t _bits;
+struct {
+u1 _tag;
+u1 _flags;
+u2 _bci;
+} _struct;
+} _header;
+// The data layout has an arbitrary number of cells, each sized
+// to accomodate a pointer or an integer.
+intptr_t _cells[1];
+// Some types of data layouts need a length field.
+static bool needs_array_len(u1 tag);
+public:
+enum {
+counter_increment = 1
+};
+enum {
+cell_size = sizeof(intptr_t)
+};
+// Tag values
+enum {
+no_tag,
+bit_data_tag,
+counter_data_tag,
+jump_data_tag,
+receiver_type_data_tag,
+virtual_call_data_tag,
+ret_data_tag,
+branch_data_tag,
+multi_branch_data_tag
+};
+enum {
+// The _struct._flags word is formatted as [trap_state:4 | flags:4].
+// The trap state breaks down further as [recompile:1 | reason:3].
+// This further breakdown is defined in deoptimization.cpp.
+// See Deoptimization::trap_state_reason for an assert that
+// trap_bits is big enough to hold reasons < Reason_RECORDED_LIMIT.
+//
+// The trap_state is collected only if ProfileTraps is true.
+trap_bits = 1+3,  // 3: enough to distinguish [0..Reason_RECORDED_LIMIT].
+trap_shift = BitsPerByte - trap_bits,
+trap_mask = right_n_bits(trap_bits),
+trap_mask_in_place = (trap_mask << trap_shift),
+flag_limit = trap_shift,
+flag_mask = right_n_bits(flag_limit),
+first_flag = 0
+};
+// Size computation
+static int header_size_in_bytes() {
+return cell_size;
+}
+static int header_size_in_cells() {
+return 1;
+}
+static int compute_size_in_bytes(int cell_count) {
+return header_size_in_bytes() + cell_count * cell_size;
+}
+// Initialization
+void initialize(u1 tag, u2 bci, int cell_count);
+// Accessors
+u1 tag() {
+return _header._struct._tag;
+}
+// Return a few bits of trap state.  Range is [0..trap_mask].
+// The state tells if traps with zero, one, or many reasons have occurred.
+// It also tells whether zero or many recompilations have occurred.
+// The associated trap histogram in the MDO itself tells whether
+// traps are common or not.  If a BCI shows that a trap X has
+// occurred, and the MDO shows N occurrences of X, we make the
+// simplifying assumption that all N occurrences can be blamed
+// on that BCI.
+int trap_state() {
+return ((_header._struct._flags >> trap_shift) & trap_mask);
+}
+void set_trap_state(int new_state) {
+assert(ProfileTraps, "used only under +ProfileTraps");
+uint old_flags = (_header._struct._flags & flag_mask);
+_header._struct._flags = (new_state << trap_shift) | old_flags;
+assert(trap_state() == new_state, "sanity");
+}
+u1 flags() {
+return _header._struct._flags;
+}
+u2 bci() {
+return _header._struct._bci;
+}
+void set_header(intptr_t value) {
+_header._bits = value;
+}
+void release_set_header(intptr_t value) {
+OrderAccess::release_store_ptr(&_header._bits, value);
+}
+intptr_t header() {
+return _header._bits;
+}
+void set_cell_at(int index, intptr_t value) {
+_cells[index] = value;
+}
+void release_set_cell_at(int index, intptr_t value) {
+OrderAccess::release_store_ptr(&_cells[index], value);
+}
+intptr_t cell_at(int index) {
+return _cells[index];
+}
+intptr_t* adr_cell_at(int index) {
+return &_cells[index];
+}
+oop* adr_oop_at(int index) {
+return (oop*)&(_cells[index]);
+}
+void set_flag_at(int flag_number) {
+assert(flag_number < flag_limit, "oob");
+_header._struct._flags |= (0x1 << flag_number);
+}
+bool flag_at(int flag_number) {
+assert(flag_number < flag_limit, "oob");
+return (_header._struct._flags & (0x1 << flag_number)) != 0;
+}
+// Low-level support for code generation.
+static ByteSize header_offset() {
+return byte_offset_of(DataLayout, _header);
+}
+static ByteSize tag_offset() {
+return byte_offset_of(DataLayout, _header._struct._tag);
+}
+static ByteSize flags_offset() {
+return byte_offset_of(DataLayout, _header._struct._flags);
+}
+static ByteSize bci_offset() {
+return byte_offset_of(DataLayout, _header._struct._bci);
+}
+static ByteSize cell_offset(int index) {
+return byte_offset_of(DataLayout, _cells[index]);
+}
+// Return a value which, when or-ed as a byte into _flags, sets the flag.
+static int flag_number_to_byte_constant(int flag_number) {
+assert(0 <= flag_number && flag_number < flag_limit, "oob");
+DataLayout temp; temp.set_header(0);
+temp.set_flag_at(flag_number);
+return temp._header._struct._flags;
+}
+// Return a value which, when or-ed as a word into _header, sets the flag.
+static intptr_t flag_mask_to_header_mask(int byte_constant) {
+DataLayout temp; temp.set_header(0);
+temp._header._struct._flags = byte_constant;
+return temp._header._bits;
+}
+};
+// ProfileData class hierarchy
+class ProfileData;
+class   BitData;
+class     CounterData;
+class       ReceiverTypeData;
+class         VirtualCallData;
+class       RetData;
+class   JumpData;
+class     BranchData;
+class   ArrayData;
+class     MultiBranchData;
+// ProfileData
+//
+// A ProfileData object is created to refer to a section of profiling
+// data in a structured way.
+class ProfileData : public ResourceObj {
+private:
+#ifndef PRODUCT
+enum {
+tab_width_one = 16,
+tab_width_two = 36
+};
+#endif // !PRODUCT
+// This is a pointer to a section of profiling data.
+DataLayout* _data;
+protected:
+DataLayout* data() { return _data; }
+enum {
+cell_size = DataLayout::cell_size
+};
+public:
+// How many cells are in this?
+virtual int cell_count() {
+ShouldNotReachHere();
+return -1;
+}
+// Return the size of this data.
+int size_in_bytes() {
+return DataLayout::compute_size_in_bytes(cell_count());
+}
+protected:
+// Low-level accessors for underlying data
+void set_intptr_at(int index, intptr_t value) {
+assert(0 <= index && index < cell_count(), "oob");
+data()->set_cell_at(index, value);
+}
+void release_set_intptr_at(int index, intptr_t value) {
+assert(0 <= index && index < cell_count(), "oob");
+data()->release_set_cell_at(index, value);
+}
+intptr_t intptr_at(int index) {
+assert(0 <= index && index < cell_count(), "oob");
+return data()->cell_at(index);
+}
+void set_uint_at(int index, uint value) {
+set_intptr_at(index, (intptr_t) value);
+}
+void release_set_uint_at(int index, uint value) {
+release_set_intptr_at(index, (intptr_t) value);
+}
+uint uint_at(int index) {
+return (uint)intptr_at(index);
+}
+void set_int_at(int index, int value) {
+set_intptr_at(index, (intptr_t) value);
+}
+void release_set_int_at(int index, int value) {
+release_set_intptr_at(index, (intptr_t) value);
+}
+int int_at(int index) {
+return (int)intptr_at(index);
+}
+int int_at_unchecked(int index) {
+return (int)data()->cell_at(index);
+}
+void set_oop_at(int index, oop value) {
+set_intptr_at(index, (intptr_t) value);
+}
+oop oop_at(int index) {
+return (oop)intptr_at(index);
+}
+oop* adr_oop_at(int index) {
+assert(0 <= index && index < cell_count(), "oob");
+return data()->adr_oop_at(index);
+}
+void set_flag_at(int flag_number) {
+data()->set_flag_at(flag_number);
+}
+bool flag_at(int flag_number) {
+return data()->flag_at(flag_number);
+}
+// two convenient imports for use by subclasses:
+static ByteSize cell_offset(int index) {
+return DataLayout::cell_offset(index);
+}
+static int flag_number_to_byte_constant(int flag_number) {
+return DataLayout::flag_number_to_byte_constant(flag_number);
+}
+ProfileData(DataLayout* data) {
+_data = data;
+}
+public:
+// Constructor for invalid ProfileData.
+ProfileData();
+u2 bci() {
+return data()->bci();
+}
+address dp() {
+return (address)_data;
+}
+int trap_state() {
+return data()->trap_state();
+}
+void set_trap_state(int new_state) {
+data()->set_trap_state(new_state);
+}
+// Type checking
+virtual bool is_BitData()         { return false; }
+virtual bool is_CounterData()     { return false; }
+virtual bool is_JumpData()        { return false; }
+virtual bool is_ReceiverTypeData(){ return false; }
+virtual bool is_VirtualCallData() { return false; }
+virtual bool is_RetData()         { return false; }
+virtual bool is_BranchData()      { return false; }
+virtual bool is_ArrayData()       { return false; }
+virtual bool is_MultiBranchData() { return false; }
+BitData* as_BitData() {
+assert(is_BitData(), "wrong type");
+return is_BitData()         ? (BitData*)        this : NULL;
+}
+CounterData* as_CounterData() {
+assert(is_CounterData(), "wrong type");
+return is_CounterData()     ? (CounterData*)    this : NULL;
+}
+JumpData* as_JumpData() {
+assert(is_JumpData(), "wrong type");
+return is_JumpData()        ? (JumpData*)       this : NULL;
+}
+ReceiverTypeData* as_ReceiverTypeData() {
+assert(is_ReceiverTypeData(), "wrong type");
+return is_ReceiverTypeData() ? (ReceiverTypeData*)this : NULL;
+}
+VirtualCallData* as_VirtualCallData() {
+assert(is_VirtualCallData(), "wrong type");
+return is_VirtualCallData() ? (VirtualCallData*)this : NULL;
+}
+RetData* as_RetData() {
+assert(is_RetData(), "wrong type");
+return is_RetData()         ? (RetData*)        this : NULL;
+}
+BranchData* as_BranchData() {
+assert(is_BranchData(), "wrong type");
+return is_BranchData()      ? (BranchData*)     this : NULL;
+}
+ArrayData* as_ArrayData() {
+assert(is_ArrayData(), "wrong type");
+return is_ArrayData()       ? (ArrayData*)      this : NULL;
+}
+MultiBranchData* as_MultiBranchData() {
+assert(is_MultiBranchData(), "wrong type");
+return is_MultiBranchData() ? (MultiBranchData*)this : NULL;
+}
+// Subclass specific initialization
+virtual void post_initialize(BytecodeStream* stream, methodDataOop mdo) {}
+// GC support
+virtual void follow_contents() {}
+virtual void oop_iterate(OopClosure* blk) {}
+virtual void oop_iterate_m(OopClosure* blk, MemRegion mr) {}
+virtual void adjust_pointers() {}
+#ifndef SERIALGC
+// Parallel old support
+virtual void follow_contents(ParCompactionManager* cm) {}
+virtual void update_pointers() {}
+virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr) {}
+#endif // SERIALGC
+// CI translation: ProfileData can represent both MethodDataOop data
+// as well as CIMethodData data. This function is provided for translating
+// an oop in a ProfileData to the ci equivalent. Generally speaking,
+// most ProfileData don't require any translation, so we provide the null
+// translation here, and the required translators are in the ci subclasses.
+virtual void translate_from(ProfileData* data) {}
+virtual void print_data_on(outputStream* st) {
+ShouldNotReachHere();
+}
+#ifndef PRODUCT
+void print_shared(outputStream* st, const char* name);
+void tab(outputStream* st);
+#endif
+};
+// BitData
+//
+// A BitData holds a flag or two in its header.
+class BitData : public ProfileData {
+protected:
+enum {
+// null_seen:
+//  saw a null operand (cast/aastore/instanceof)
+null_seen_flag              = DataLayout::first_flag + 0
+};
+enum { bit_cell_count = 0 };  // no additional data fields needed.
+public:
+BitData(DataLayout* layout) : ProfileData(layout) {
+}
+virtual bool is_BitData() { return true; }
+static int static_cell_count() {
+return bit_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Accessor
+// The null_seen flag bit is specially known to the interpreter.
+// Consulting it allows the compiler to avoid setting up null_check traps.
+bool null_seen()     { return flag_at(null_seen_flag); }
+void set_null_seen()    { set_flag_at(null_seen_flag); }
+// Code generation support
+static int null_seen_byte_constant() {
+return flag_number_to_byte_constant(null_seen_flag);
+}
+static ByteSize bit_data_size() {
+return cell_offset(bit_cell_count);
+}
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// CounterData
+//
+// A CounterData corresponds to a simple counter.
+class CounterData : public BitData {
+protected:
+enum {
+count_off,
+counter_cell_count
+};
+public:
+CounterData(DataLayout* layout) : BitData(layout) {}
+virtual bool is_CounterData() { return true; }
+static int static_cell_count() {
+return counter_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Direct accessor
+uint count() {
+return uint_at(count_off);
+}
+// Code generation support
+static ByteSize count_offset() {
+return cell_offset(count_off);
+}
+static ByteSize counter_data_size() {
+return cell_offset(counter_cell_count);
+}
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// JumpData
+//
+// A JumpData is used to access profiling information for a direct
+// branch.  It is a counter, used for counting the number of branches,
+// plus a data displacement, used for realigning the data pointer to
+// the corresponding target bci.
+class JumpData : public ProfileData {
+protected:
+enum {
+taken_off_set,
+displacement_off_set,
+jump_cell_count
+};
+void set_displacement(int displacement) {
+set_int_at(displacement_off_set, displacement);
+}
+public:
+JumpData(DataLayout* layout) : ProfileData(layout) {
+assert(layout->tag() == DataLayout::jump_data_tag ||
+layout->tag() == DataLayout::branch_data_tag, "wrong type");
+}
+virtual bool is_JumpData() { return true; }
+static int static_cell_count() {
+return jump_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Direct accessor
+uint taken() {
+return uint_at(taken_off_set);
+}
+// Saturating counter
+uint inc_taken() {
+uint cnt = taken() + 1;
+// Did we wrap? Will compiler screw us??
+if (cnt == 0) cnt--;
+set_uint_at(taken_off_set, cnt);
+return cnt;
+}
+int displacement() {
+return int_at(displacement_off_set);
+}
+// Code generation support
+static ByteSize taken_offset() {
+return cell_offset(taken_off_set);
+}
+static ByteSize displacement_offset() {
+return cell_offset(displacement_off_set);
+}
+// Specific initialization.
+void post_initialize(BytecodeStream* stream, methodDataOop mdo);
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// ReceiverTypeData
+//
+// A ReceiverTypeData is used to access profiling information about a
+// dynamic type check.  It consists of a counter which counts the total times
+// that the check is reached, and a series of (klassOop, count) pairs
+// which are used to store a type profile for the receiver of the check.
+class ReceiverTypeData : public CounterData {
+protected:
+enum {
+receiver0_offset = counter_cell_count,
+count0_offset,
+receiver_type_row_cell_count = (count0_offset + 1) - receiver0_offset
+};
+public:
+ReceiverTypeData(DataLayout* layout) : CounterData(layout) {
+assert(layout->tag() == DataLayout::receiver_type_data_tag ||
+layout->tag() == DataLayout::virtual_call_data_tag, "wrong type");
+}
+virtual bool is_ReceiverTypeData() { return true; }
+static int static_cell_count() {
+return counter_cell_count + (uint) TypeProfileWidth * receiver_type_row_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Direct accessors
+static uint row_limit() {
+return TypeProfileWidth;
+}
+static int receiver_cell_index(uint row) {
+return receiver0_offset + row * receiver_type_row_cell_count;
+}
+static int receiver_count_cell_index(uint row) {
+return count0_offset + row * receiver_type_row_cell_count;
+}
+// Get the receiver at row.  The 'unchecked' version is needed by parallel old
+// gc; it does not assert the receiver is a klass.  During compaction of the
+// perm gen, the klass may already have moved, so the is_klass() predicate
+// would fail.  The 'normal' version should be used whenever possible.
+klassOop receiver_unchecked(uint row) {
+assert(row < row_limit(), "oob");
+oop recv = oop_at(receiver_cell_index(row));
+return (klassOop)recv;
+}
+klassOop receiver(uint row) {
+klassOop recv = receiver_unchecked(row);
+assert(recv == NULL || ((oop)recv)->is_klass(), "wrong type");
+return recv;
+}
+uint receiver_count(uint row) {
+assert(row < row_limit(), "oob");
+return uint_at(receiver_count_cell_index(row));
+}
+// Code generation support
+static ByteSize receiver_offset(uint row) {
+return cell_offset(receiver_cell_index(row));
+}
+static ByteSize receiver_count_offset(uint row) {
+return cell_offset(receiver_count_cell_index(row));
+}
+static ByteSize receiver_type_data_size() {
+return cell_offset(static_cell_count());
+}
+// GC support
+virtual void follow_contents();
+virtual void oop_iterate(OopClosure* blk);
+virtual void oop_iterate_m(OopClosure* blk, MemRegion mr);
+virtual void adjust_pointers();
+#ifndef SERIALGC
+// Parallel old support
+virtual void follow_contents(ParCompactionManager* cm);
+virtual void update_pointers();
+virtual void update_pointers(HeapWord* beg_addr, HeapWord* end_addr);
+#endif // SERIALGC
+oop* adr_receiver(uint row) {
+return adr_oop_at(receiver_cell_index(row));
+}
+#ifndef PRODUCT
+void print_receiver_data_on(outputStream* st);
+void print_data_on(outputStream* st);
+#endif
+};
+// VirtualCallData
+//
+// A VirtualCallData is used to access profiling information about a
+// virtual call.  For now, it has nothing more than a ReceiverTypeData.
+class VirtualCallData : public ReceiverTypeData {
+public:
+VirtualCallData(DataLayout* layout) : ReceiverTypeData(layout) {
+assert(layout->tag() == DataLayout::virtual_call_data_tag, "wrong type");
+}
+virtual bool is_VirtualCallData() { return true; }
+static int static_cell_count() {
+// At this point we could add more profile state, e.g., for arguments.
+// But for now it's the same size as the base record type.
+return ReceiverTypeData::static_cell_count();
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Direct accessors
+static ByteSize virtual_call_data_size() {
+return cell_offset(static_cell_count());
+}
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// RetData
+//
+// A RetData is used to access profiling information for a ret bytecode.
+// It is composed of a count of the number of times that the ret has
+// been executed, followed by a series of triples of the form
+// (bci, count, di) which count the number of times that some bci was the
+// target of the ret and cache a corresponding data displacement.
+class RetData : public CounterData {
+protected:
+enum {
+bci0_offset = counter_cell_count,
+count0_offset,
+displacement0_offset,
+ret_row_cell_count = (displacement0_offset + 1) - bci0_offset
+};
+void set_bci(uint row, int bci) {
+assert((uint)row < row_limit(), "oob");
+set_int_at(bci0_offset + row * ret_row_cell_count, bci);
+}
+void release_set_bci(uint row, int bci) {
+assert((uint)row < row_limit(), "oob");
+// 'release' when setting the bci acts as a valid flag for other
+// threads wrt bci_count and bci_displacement.
+release_set_int_at(bci0_offset + row * ret_row_cell_count, bci);
+}
+void set_bci_count(uint row, uint count) {
+assert((uint)row < row_limit(), "oob");
+set_uint_at(count0_offset + row * ret_row_cell_count, count);
+}
+void set_bci_displacement(uint row, int disp) {
+set_int_at(displacement0_offset + row * ret_row_cell_count, disp);
+}
+public:
+RetData(DataLayout* layout) : CounterData(layout) {
+assert(layout->tag() == DataLayout::ret_data_tag, "wrong type");
+}
+virtual bool is_RetData() { return true; }
+enum {
+no_bci = -1 // value of bci when bci1/2 are not in use.
+};
+static int static_cell_count() {
+return counter_cell_count + (uint) BciProfileWidth * ret_row_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+static uint row_limit() {
+return BciProfileWidth;
+}
+static int bci_cell_index(uint row) {
+return bci0_offset + row * ret_row_cell_count;
+}
+static int bci_count_cell_index(uint row) {
+return count0_offset + row * ret_row_cell_count;
+}
+static int bci_displacement_cell_index(uint row) {
+return displacement0_offset + row * ret_row_cell_count;
+}
+// Direct accessors
+int bci(uint row) {
+return int_at(bci_cell_index(row));
+}
+uint bci_count(uint row) {
+return uint_at(bci_count_cell_index(row));
+}
+int bci_displacement(uint row) {
+return int_at(bci_displacement_cell_index(row));
+}
+// Interpreter Runtime support
+address fixup_ret(int return_bci, methodDataHandle mdo);
+// Code generation support
+static ByteSize bci_offset(uint row) {
+return cell_offset(bci_cell_index(row));
+}
+static ByteSize bci_count_offset(uint row) {
+return cell_offset(bci_count_cell_index(row));
+}
+static ByteSize bci_displacement_offset(uint row) {
+return cell_offset(bci_displacement_cell_index(row));
+}
+// Specific initialization.
+void post_initialize(BytecodeStream* stream, methodDataOop mdo);
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// BranchData
+//
+// A BranchData is used to access profiling data for a two-way branch.
+// It consists of taken and not_taken counts as well as a data displacement
+// for the taken case.
+class BranchData : public JumpData {
+protected:
+enum {
+not_taken_off_set = jump_cell_count,
+branch_cell_count
+};
+void set_displacement(int displacement) {
+set_int_at(displacement_off_set, displacement);
+}
+public:
+BranchData(DataLayout* layout) : JumpData(layout) {
+assert(layout->tag() == DataLayout::branch_data_tag, "wrong type");
+}
+virtual bool is_BranchData() { return true; }
+static int static_cell_count() {
+return branch_cell_count;
+}
+virtual int cell_count() {
+return static_cell_count();
+}
+// Direct accessor
+uint not_taken() {
+return uint_at(not_taken_off_set);
+}
+uint inc_not_taken() {
+uint cnt = not_taken() + 1;
+// Did we wrap? Will compiler screw us??
+if (cnt == 0) cnt--;
+set_uint_at(not_taken_off_set, cnt);
+return cnt;
+}
+// Code generation support
+static ByteSize not_taken_offset() {
+return cell_offset(not_taken_off_set);
+}
+static ByteSize branch_data_size() {
+return cell_offset(branch_cell_count);
+}
+// Specific initialization.
+void post_initialize(BytecodeStream* stream, methodDataOop mdo);
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// ArrayData
+//
+// A ArrayData is a base class for accessing profiling data which does
+// not have a statically known size.  It consists of an array length
+// and an array start.
+class ArrayData : public ProfileData {
+protected:
+friend class DataLayout;
+enum {
+array_len_off_set,
+array_start_off_set
+};
+uint array_uint_at(int index) {
+int aindex = index + array_start_off_set;
+return uint_at(aindex);
+}
+int array_int_at(int index) {
+int aindex = index + array_start_off_set;
+return int_at(aindex);
+}
+oop array_oop_at(int index) {
+int aindex = index + array_start_off_set;
+return oop_at(aindex);
+}
+void array_set_int_at(int index, int value) {
+int aindex = index + array_start_off_set;
+set_int_at(aindex, value);
+}
+// Code generation support for subclasses.
+static ByteSize array_element_offset(int index) {
+return cell_offset(array_start_off_set + index);
+}
+public:
+ArrayData(DataLayout* layout) : ProfileData(layout) {}
+virtual bool is_ArrayData() { return true; }
+static int static_cell_count() {
+return -1;
+}
+int array_len() {
+return int_at_unchecked(array_len_off_set);
+}
+virtual int cell_count() {
+return array_len() + 1;
+}
+// Code generation support
+static ByteSize array_len_offset() {
+return cell_offset(array_len_off_set);
+}
+static ByteSize array_start_offset() {
+return cell_offset(array_start_off_set);
+}
+};
+// MultiBranchData
+//
+// A MultiBranchData is used to access profiling information for
+// a multi-way branch (*switch bytecodes).  It consists of a series
+// of (count, displacement) pairs, which count the number of times each
+// case was taken and specify the data displacment for each branch target.
+class MultiBranchData : public ArrayData {
+protected:
+enum {
+default_count_off_set,
+default_disaplacement_off_set,
+case_array_start
+};
+enum {
+relative_count_off_set,
+relative_displacement_off_set,
+per_case_cell_count
+};
+void set_default_displacement(int displacement) {
+array_set_int_at(default_disaplacement_off_set, displacement);
+}
+void set_displacement_at(int index, int displacement) {
+array_set_int_at(case_array_start +
+index * per_case_cell_count +
+relative_displacement_off_set,
+displacement);
+}
+public:
+MultiBranchData(DataLayout* layout) : ArrayData(layout) {
+assert(layout->tag() == DataLayout::multi_branch_data_tag, "wrong type");
+}
+virtual bool is_MultiBranchData() { return true; }
+static int compute_cell_count(BytecodeStream* stream);
+int number_of_cases() {
+int alen = array_len() - 2; // get rid of default case here.
+assert(alen % per_case_cell_count == 0, "must be even");
+return (alen / per_case_cell_count);
+}
+uint default_count() {
+return array_uint_at(default_count_off_set);
+}
+int default_displacement() {
+return array_int_at(default_disaplacement_off_set);
+}
+uint count_at(int index) {
+return array_uint_at(case_array_start +
+index * per_case_cell_count +
+relative_count_off_set);
+}
+int displacement_at(int index) {
+return array_int_at(case_array_start +
+index * per_case_cell_count +
+relative_displacement_off_set);
+}
+// Code generation support
+static ByteSize default_count_offset() {
+return array_element_offset(default_count_off_set);
+}
+static ByteSize default_displacement_offset() {
+return array_element_offset(default_disaplacement_off_set);
+}
+static ByteSize case_count_offset(int index) {
+return case_array_offset() +
+(per_case_size() * index) +
+relative_count_offset();
+}
+static ByteSize case_array_offset() {
+return array_element_offset(case_array_start);
+}
+static ByteSize per_case_size() {
+return in_ByteSize(per_case_cell_count) * cell_size;
+}
+static ByteSize relative_count_offset() {
+return in_ByteSize(relative_count_off_set) * cell_size;
+}
+static ByteSize relative_displacement_offset() {
+return in_ByteSize(relative_displacement_off_set) * cell_size;
+}
+// Specific initialization.
+void post_initialize(BytecodeStream* stream, methodDataOop mdo);
+#ifndef PRODUCT
+void print_data_on(outputStream* st);
+#endif
+};
+// methodDataOop
+//
+// A methodDataOop holds information which has been collected about
+// a method.  Its layout looks like this:
+//
+// -----------------------------
+// | header                    |
+// | klass                     |
+// -----------------------------
+// | method                    |
+// | size of the methodDataOop |
+// -----------------------------
+// | Data entries...           |
+// |   (variable size)         |
+// |                           |
+// .                           .
+// .                           .
+// .                           .
+// |                           |
+// -----------------------------
+//
+// The data entry area is a heterogeneous array of DataLayouts. Each
+// DataLayout in the array corresponds to a specific bytecode in the
+// method.  The entries in the array are sorted by the corresponding
+// bytecode.  Access to the data is via resource-allocated ProfileData,
+// which point to the underlying blocks of DataLayout structures.
+//
+// During interpretation, if profiling in enabled, the interpreter
+// maintains a method data pointer (mdp), which points at the entry
+// in the array corresponding to the current bci.  In the course of
+// intepretation, when a bytecode is encountered that has profile data
+// associated with it, the entry pointed to by mdp is updated, then the
+// mdp is adjusted to point to the next appropriate DataLayout.  If mdp
+// is NULL to begin with, the interpreter assumes that the current method
+// is not (yet) being profiled.
+//
+// In methodDataOop parlance, "dp" is a "data pointer", the actual address
+// of a DataLayout element.  A "di" is a "data index", the offset in bytes
+// from the base of the data entry array.  A "displacement" is the byte offset
+// in certain ProfileData objects that indicate the amount the mdp must be
+// adjusted in the event of a change in control flow.
+//
+class methodDataOopDesc : public oopDesc {
+friend class VMStructs;
+private:
+friend class ProfileData;
+// Back pointer to the methodOop
+methodOop _method;
+// Size of this oop in bytes
+int _size;
+// Cached hint for bci_to_dp and bci_to_data
+int _hint_di;
+// Whole-method sticky bits and flags
+public:
+enum {
+_trap_hist_limit    = 16,   // decoupled from Deoptimization::Reason_LIMIT
+_trap_hist_mask     = max_jubyte,
+_extra_data_count   = 4     // extra DataLayout headers, for trap history
+}; // Public flag values
+private:
+uint _nof_decompiles;             // count of all nmethod removals
+uint _nof_overflow_recompiles;    // recompile count, excluding recomp. bits
+uint _nof_overflow_traps;         // trap count, excluding _trap_hist
+union {
+intptr_t _align;
+u1 _array[_trap_hist_limit];
+} _trap_hist;
+// Support for interprocedural escape analysis, from Thomas Kotzmann.
+intx              _eflags;          // flags on escape information
+intx              _arg_local;       // bit set of non-escaping arguments
+intx              _arg_stack;       // bit set of stack-allocatable arguments
+intx              _arg_returned;    // bit set of returned arguments
+int _creation_mileage;            // method mileage at MDO creation
+// Size of _data array in bytes.  (Excludes header and extra_data fields.)
+int _data_size;
+// Beginning of the data entries
+intptr_t _data[1];
+// Helper for size computation
+static int compute_data_size(BytecodeStream* stream);
+static int bytecode_cell_count(Bytecodes::Code code);
+enum { no_profile_data = -1, variable_cell_count = -2 };
+// Helper for initialization
+DataLayout* data_layout_at(int data_index) {
+assert(data_index % sizeof(intptr_t) == 0, "unaligned");
+return (DataLayout*) (((address)_data) + data_index);
+}
+// Initialize an individual data segment.  Returns the size of
+// the segment in bytes.
+int initialize_data(BytecodeStream* stream, int data_index);
+// Helper for data_at
+DataLayout* limit_data_position() {
+return (DataLayout*)((address)data_base() + _data_size);
+}
+bool out_of_bounds(int data_index) {
+return data_index >= data_size();
+}
+// Give each of the data entries a chance to perform specific
+// data initialization.
+void post_initialize(BytecodeStream* stream);
+// hint accessors
+int      hint_di() const  { return _hint_di; }
+void set_hint_di(int di)  {
+assert(!out_of_bounds(di), "hint_di out of bounds");
+_hint_di = di;
+}
+ProfileData* data_before(int bci) {
+// avoid SEGV on this edge case
+if (data_size() == 0)
+return NULL;
+int hint = hint_di();
+if (data_layout_at(hint)->bci() <= bci)
+return data_at(hint);
+return first_data();
+}
+// What is the index of the first data entry?
+int first_di() { return 0; }
+// Find or create an extra ProfileData:
+ProfileData* bci_to_extra_data(int bci, bool create_if_missing);
+public:
+static int header_size() {
+return sizeof(methodDataOopDesc)/wordSize;
+}
+// Compute the size of a methodDataOop before it is created.
+static int compute_allocation_size_in_bytes(methodHandle method);
+static int compute_allocation_size_in_words(methodHandle method);
+static int compute_extra_data_count(int data_size, int empty_bc_count);
+// Determine if a given bytecode can have profile information.
+static bool bytecode_has_profile(Bytecodes::Code code) {
+return bytecode_cell_count(code) != no_profile_data;
+}
+// Perform initialization of a new methodDataOop
+void initialize(methodHandle method);
+// My size
+int object_size_in_bytes() { return _size; }
+int object_size() {
+return align_object_size(align_size_up(_size, BytesPerWord)/BytesPerWord);
+}
+int      creation_mileage() const  { return _creation_mileage; }
+void set_creation_mileage(int x)   { _creation_mileage = x; }
+bool is_mature() const;  // consult mileage and ProfileMaturityPercentage
+static int mileage_of(methodOop m);
+// Support for interprocedural escape analysis, from Thomas Kotzmann.
+enum EscapeFlag {
+estimated    = 1 << 0,
+return_local = 1 << 1
+};
+intx eflags()                                  { return _eflags; }
+intx arg_local()                               { return _arg_local; }
+intx arg_stack()                               { return _arg_stack; }
+intx arg_returned()                            { return _arg_returned; }
+void set_eflags(intx v)                        { _eflags = v; }
+void set_arg_local(intx v)                     { _arg_local = v; }
+void set_arg_stack(intx v)                     { _arg_stack = v; }
+void set_arg_returned(intx v)                  { _arg_returned = v; }
+void clear_escape_info()                       { _eflags = _arg_local = _arg_stack = _arg_returned = 0; }
+// Location and size of data area
+address data_base() const {
+return (address) _data;
+}
+int data_size() {
+return _data_size;
+}
+// Accessors
+methodOop method() { return _method; }
+// Get the data at an arbitrary (sort of) data index.
+ProfileData* data_at(int data_index);
+// Walk through the data in order.
+ProfileData* first_data() { return data_at(first_di()); }
+ProfileData* next_data(ProfileData* current);
+bool is_valid(ProfileData* current) { return current != NULL; }
+// Convert a dp (data pointer) to a di (data index).
+int dp_to_di(address dp) {
+return dp - ((address)_data);
+}
+address di_to_dp(int di) {
+return (address)data_layout_at(di);
+}
+// bci to di/dp conversion.
+address bci_to_dp(int bci);
+int bci_to_di(int bci) {
+return dp_to_di(bci_to_dp(bci));
+}
+// Get the data at an arbitrary bci, or NULL if there is none.
+ProfileData* bci_to_data(int bci);
+// Same, but try to create an extra_data record if one is needed:
+ProfileData* allocate_bci_to_data(int bci) {
+ProfileData* data = bci_to_data(bci);
+return (data != NULL) ? data : bci_to_extra_data(bci, true);
+}
+// Add a handful of extra data records, for trap tracking.
+DataLayout* extra_data_base() { return limit_data_position(); }
+DataLayout* extra_data_limit() { return (DataLayout*)((address)this + object_size_in_bytes()); }
+int extra_data_size() { return (address)extra_data_limit()
+- (address)extra_data_base(); }
+static DataLayout* next_extra(DataLayout* dp) { return (DataLayout*)((address)dp + in_bytes(DataLayout::cell_offset(0))); }
+// Return (uint)-1 for overflow.
+uint trap_count(int reason) const {
+assert((uint)reason < _trap_hist_limit, "oob");
+return (int)((_trap_hist._array[reason]+1) & _trap_hist_mask) - 1;
+}
+// For loops:
+static uint trap_reason_limit() { return _trap_hist_limit; }
+static uint trap_count_limit()  { return _trap_hist_mask; }
+uint inc_trap_count(int reason) {
+// Count another trap, anywhere in this method.
+assert(reason >= 0, "must be single trap");
+if ((uint)reason < _trap_hist_limit) {
+uint cnt1 = 1 + _trap_hist._array[reason];
+if ((cnt1 & _trap_hist_mask) != 0) {  // if no counter overflow...
+_trap_hist._array[reason] = cnt1;
+return cnt1;
+} else {
+return _trap_hist_mask + (++_nof_overflow_traps);
+}
+} else {
+// Could not represent the count in the histogram.
+return (++_nof_overflow_traps);
+}
+}
+uint overflow_trap_count() const {
+return _nof_overflow_traps;
+}
+uint overflow_recompile_count() const {
+return _nof_overflow_recompiles;
+}
+void inc_overflow_recompile_count() {
+_nof_overflow_recompiles += 1;
+}
+uint decompile_count() const {
+return _nof_decompiles;
+}
+void inc_decompile_count() {
+_nof_decompiles += 1;
+}
+// Support for code generation
+static ByteSize data_offset() {
+return byte_offset_of(methodDataOopDesc, _data[0]);
+}
+// GC support
+oop* adr_method() const { return (oop*)&_method; }
+bool object_is_parsable() const { return _size != 0; }
+void set_object_is_parsable(int object_size_in_bytes) { _size = object_size_in_bytes; }
+#ifndef PRODUCT
+// printing support for method data
+void print_data_on(outputStream* st);
+#endif
+// verification
+void verify_data_on(outputStream* st);
+};

Mercurial > hg > truffle

comparison src/share/vm/oops/methodDataOop.hpp @ 0:a61af66fc99e jdk7-b24