truffle: src/share/vm/opto/matcher.hpp comparison

comparison src/share/vm/opto/matcher.hpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
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children	7793bd37a336

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+/*
+* Copyright 1997-2007 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 Compile;
+class Node;
+class MachNode;
+class MachTypeNode;
+class MachOper;
+//---------------------------Matcher-------------------------------------------
+class Matcher : public PhaseTransform {
+friend class VMStructs;
+// Private arena of State objects
+ResourceArea _states_arena;
+VectorSet   _visited;         // Visit bits
+// Used to control the Label pass
+VectorSet   _shared;          // Shared Ideal Node
+VectorSet   _dontcare;        // Nothing the matcher cares about
+// Private methods which perform the actual matching and reduction
+// Walks the label tree, generating machine nodes
+MachNode *ReduceInst( State *s, int rule, Node *&mem);
+void ReduceInst_Chain_Rule( State *s, int rule, Node *&mem, MachNode *mach);
+uint ReduceInst_Interior(State *s, int rule, Node *&mem, MachNode *mach, uint num_opnds);
+void ReduceOper( State *s, int newrule, Node *&mem, MachNode *mach );
+// If this node already matched using "rule", return the MachNode for it.
+MachNode* find_shared_constant(Node* con, uint rule);
+// Convert a dense opcode number to an expanded rule number
+const int *_reduceOp;
+const int *_leftOp;
+const int *_rightOp;
+// Map dense opcode number to info on when rule is swallowed constant.
+const bool *_swallowed;
+// Map dense rule number to determine if this is an instruction chain rule
+const uint _begin_inst_chain_rule;
+const uint _end_inst_chain_rule;
+// We want to clone constants and possible CmpI-variants.
+// If we do not clone CmpI, then we can have many instances of
+// condition codes alive at once.  This is OK on some chips and
+// bad on others.  Hence the machine-dependent table lookup.
+const char *_must_clone;
+// Find shared Nodes, or Nodes that otherwise are Matcher roots
+void find_shared( Node *n );
+// Debug and profile information for nodes in old space:
+GrowableArray<Node_Notes*>* _old_node_note_array;
+// Node labeling iterator for instruction selection
+Node *Label_Root( const Node *n, State *svec, Node *control, const Node *mem );
+Node *transform( Node *dummy );
+Node_List &_proj_list;        // For Machine nodes killing many values
+Node_Array _shared_constants;
+debug_only(Node_Array _old2new_map;)   // Map roots of ideal-trees to machine-roots
+// Accessors for the inherited field PhaseTransform::_nodes:
+void   grow_new_node_array(uint idx_limit) {
+_nodes.map(idx_limit-1, NULL);
+}
+bool    has_new_node(const Node* n) const {
+return _nodes.at(n->_idx) != NULL;
+}
+Node*       new_node(const Node* n) const {
+assert(has_new_node(n), "set before get");
+return _nodes.at(n->_idx);
+}
+void    set_new_node(const Node* n, Node *nn) {
+assert(!has_new_node(n), "set only once");
+_nodes.map(n->_idx, nn);
+}
+#ifdef ASSERT
+// Make sure only new nodes are reachable from this node
+void verify_new_nodes_only(Node* root);
+#endif
+public:
+int LabelRootDepth;
+static const int base2reg[];        // Map Types to machine register types
+// Convert ideal machine register to a register mask for spill-loads
+static const RegMask *idealreg2regmask[];
+RegMask *idealreg2spillmask[_last_machine_leaf];
+RegMask *idealreg2debugmask[_last_machine_leaf];
+void init_spill_mask( Node *ret );
+// Convert machine register number to register mask
+static uint mreg2regmask_max;
+static RegMask mreg2regmask[];
+static RegMask STACK_ONLY_mask;
+bool    is_shared( Node *n ) { return _shared.test(n->_idx) != 0; }
+void   set_shared( Node *n ) {  _shared.set(n->_idx); }
+bool   is_visited( Node *n ) { return _visited.test(n->_idx) != 0; }
+void  set_visited( Node *n ) { _visited.set(n->_idx); }
+bool  is_dontcare( Node *n ) { return _dontcare.test(n->_idx) != 0; }
+void set_dontcare( Node *n ) {  _dontcare.set(n->_idx); }
+// Mode bit to tell DFA and expand rules whether we are running after
+// (or during) register selection.  Usually, the matcher runs before,
+// but it will also get called to generate post-allocation spill code.
+// In this situation, it is a deadly error to attempt to allocate more
+// temporary registers.
+bool _allocation_started;
+// Machine register names
+static const char *regName[];
+// Machine register encodings
+static const unsigned char _regEncode[];
+// Machine Node names
+const char **_ruleName;
+// Rules that are cheaper to rematerialize than to spill
+static const uint _begin_rematerialize;
+static const uint _end_rematerialize;
+// An array of chars, from 0 to _last_Mach_Reg.
+// No Save       = 'N' (for register windows)
+// Save on Entry = 'E'
+// Save on Call  = 'C'
+// Always Save   = 'A' (same as SOE + SOC)
+const char *_register_save_policy;
+const char *_c_reg_save_policy;
+// Convert a machine register to a machine register type, so-as to
+// properly match spill code.
+const int *_register_save_type;
+// Maps from machine register to boolean; true if machine register can
+// be holding a call argument in some signature.
+static bool can_be_java_arg( int reg );
+// Maps from machine register to boolean; true if machine register holds
+// a spillable argument.
+static bool is_spillable_arg( int reg );
+// List of IfFalse or IfTrue Nodes that indicate a taken null test.
+// List is valid in the post-matching space.
+Node_List _null_check_tests;
+void collect_null_checks( Node *proj );
+void validate_null_checks( );
+Matcher( Node_List &proj_list );
+// Select instructions for entire method
+void  match( );
+// Helper for match
+OptoReg::Name warp_incoming_stk_arg( VMReg reg );
+// Transform, then walk.  Does implicit DCE while walking.
+// Name changed from "transform" to avoid it being virtual.
+Node *xform( Node *old_space_node, int Nodes );
+// Match a single Ideal Node - turn it into a 1-Node tree; Label & Reduce.
+MachNode *match_tree( const Node *n );
+MachNode *match_sfpt( SafePointNode *sfpt );
+// Helper for match_sfpt
+OptoReg::Name warp_outgoing_stk_arg( VMReg reg, OptoReg::Name begin_out_arg_area, OptoReg::Name &out_arg_limit_per_call );
+// Initialize first stack mask and related masks.
+void init_first_stack_mask();
+// If we should save-on-entry this register
+bool is_save_on_entry( int reg );
+// Fixup the save-on-entry registers
+void Fixup_Save_On_Entry( );
+// --- Frame handling ---
+// Register number of the stack slot corresponding to the incoming SP.
+// Per the Big Picture in the AD file, it is:
+//   SharedInfo::stack0 + locks + in_preserve_stack_slots + pad2.
+OptoReg::Name _old_SP;
+// Register number of the stack slot corresponding to the highest incoming
+// argument on the stack.  Per the Big Picture in the AD file, it is:
+//   _old_SP + out_preserve_stack_slots + incoming argument size.
+OptoReg::Name _in_arg_limit;
+// Register number of the stack slot corresponding to the new SP.
+// Per the Big Picture in the AD file, it is:
+//   _in_arg_limit + pad0
+OptoReg::Name _new_SP;
+// Register number of the stack slot corresponding to the highest outgoing
+// argument on the stack.  Per the Big Picture in the AD file, it is:
+//   _new_SP + max outgoing arguments of all calls
+OptoReg::Name _out_arg_limit;
+OptoRegPair *_parm_regs;        // Array of machine registers per argument
+RegMask *_calling_convention_mask; // Array of RegMasks per argument
+// Does matcher support this ideal node?
+static const bool has_match_rule(int opcode);
+static const bool _hasMatchRule[_last_opcode];
+// Used to determine if we have fast l2f conversion
+// USII has it, USIII doesn't
+static const bool convL2FSupported(void);
+// Vector width in bytes
+static const uint vector_width_in_bytes(void);
+// Vector ideal reg
+static const uint vector_ideal_reg(void);
+// Used to determine a "low complexity" 64-bit constant.  (Zero is simple.)
+// The standard of comparison is one (StoreL ConL) vs. two (StoreI ConI).
+// Depends on the details of 64-bit constant generation on the CPU.
+static const bool isSimpleConstant64(jlong con);
+// These calls are all generated by the ADLC
+// TRUE - grows up, FALSE - grows down (Intel)
+virtual bool stack_direction() const;
+// Java-Java calling convention
+// (what you use when Java calls Java)
+// Alignment of stack in bytes, standard Intel word alignment is 4.
+// Sparc probably wants at least double-word (8).
+static uint stack_alignment_in_bytes();
+// Alignment of stack, measured in stack slots.
+// The size of stack slots is defined by VMRegImpl::stack_slot_size.
+static uint stack_alignment_in_slots() {
+return stack_alignment_in_bytes() / (VMRegImpl::stack_slot_size);
+}
+// Array mapping arguments to registers.  Argument 0 is usually the 'this'
+// pointer.  Registers can include stack-slots and regular registers.
+static void calling_convention( BasicType *, VMRegPair *, uint len, bool is_outgoing );
+// Convert a sig into a calling convention register layout
+// and find interesting things about it.
+static OptoReg::Name  find_receiver( bool is_outgoing );
+// Return address register.  On Intel it is a stack-slot.  On PowerPC
+// it is the Link register.  On Sparc it is r31?
+virtual OptoReg::Name return_addr() const;
+RegMask              _return_addr_mask;
+// Return value register.  On Intel it is EAX.  On Sparc i0/o0.
+static OptoRegPair   return_value(int ideal_reg, bool is_outgoing);
+static OptoRegPair c_return_value(int ideal_reg, bool is_outgoing);
+RegMask                     _return_value_mask;
+// Inline Cache Register
+static OptoReg::Name  inline_cache_reg();
+static const RegMask &inline_cache_reg_mask();
+static int            inline_cache_reg_encode();
+// Register for DIVI projection of divmodI
+static RegMask divI_proj_mask();
+// Register for MODI projection of divmodI
+static RegMask modI_proj_mask();
+// Register for DIVL projection of divmodL
+static RegMask divL_proj_mask();
+// Register for MODL projection of divmodL
+static RegMask modL_proj_mask();
+// Java-Interpreter calling convention
+// (what you use when calling between compiled-Java and Interpreted-Java
+// Number of callee-save + always-save registers
+// Ignores frame pointer and "special" registers
+static int  number_of_saved_registers();
+// The Method-klass-holder may be passed in the inline_cache_reg
+// and then expanded into the inline_cache_reg and a method_oop register
+static OptoReg::Name  interpreter_method_oop_reg();
+static const RegMask &interpreter_method_oop_reg_mask();
+static int            interpreter_method_oop_reg_encode();
+static OptoReg::Name  compiler_method_oop_reg();
+static const RegMask &compiler_method_oop_reg_mask();
+static int            compiler_method_oop_reg_encode();
+// Interpreter's Frame Pointer Register
+static OptoReg::Name  interpreter_frame_pointer_reg();
+static const RegMask &interpreter_frame_pointer_reg_mask();
+// Java-Native calling convention
+// (what you use when intercalling between Java and C++ code)
+// Array mapping arguments to registers.  Argument 0 is usually the 'this'
+// pointer.  Registers can include stack-slots and regular registers.
+static void c_calling_convention( BasicType*, VMRegPair *, uint );
+// Frame pointer. The frame pointer is kept at the base of the stack
+// and so is probably the stack pointer for most machines.  On Intel
+// it is ESP.  On the PowerPC it is R1.  On Sparc it is SP.
+OptoReg::Name  c_frame_pointer() const;
+static RegMask c_frame_ptr_mask;
+// !!!!! Special stuff for building ScopeDescs
+virtual int      regnum_to_fpu_offset(int regnum);
+// Is this branch offset small enough to be addressed by a short branch?
+bool is_short_branch_offset(int offset);
+// Optional scaling for the parameter to the ClearArray/CopyArray node.
+static const bool init_array_count_is_in_bytes;
+// Threshold small size (in bytes) for a ClearArray/CopyArray node.
+// Anything this size or smaller may get converted to discrete scalar stores.
+static const int init_array_short_size;
+// Should the Matcher clone shifts on addressing modes, expecting them to
+// be subsumed into complex addressing expressions or compute them into
+// registers?  True for Intel but false for most RISCs
+static const bool clone_shift_expressions;
+// Is it better to copy float constants, or load them directly from memory?
+// Intel can load a float constant from a direct address, requiring no
+// extra registers.  Most RISCs will have to materialize an address into a
+// register first, so they may as well materialize the constant immediately.
+static const bool rematerialize_float_constants;
+// If CPU can load and store mis-aligned doubles directly then no fixup is
+// needed.  Else we split the double into 2 integer pieces and move it
+// piece-by-piece.  Only happens when passing doubles into C code or when
+// calling i2c adapters as the Java calling convention forces doubles to be
+// aligned.
+static const bool misaligned_doubles_ok;
+// Perform a platform dependent implicit null fixup.  This is needed
+// on windows95 to take care of some unusual register constraints.
+void pd_implicit_null_fixup(MachNode *load, uint idx);
+// Advertise here if the CPU requires explicit rounding operations
+// to implement the UseStrictFP mode.
+static const bool strict_fp_requires_explicit_rounding;
+// Do floats take an entire double register or just half?
+static const bool float_in_double;
+// Do ints take an entire long register or just half?
+static const bool int_in_long;
+// This routine is run whenever a graph fails to match.
+// If it returns, the compiler should bailout to interpreter without error.
+// In non-product mode, SoftMatchFailure is false to detect non-canonical
+// graphs.  Print a message and exit.
+static void soft_match_failure() {
+if( SoftMatchFailure ) return;
+else { fatal("SoftMatchFailure is not allowed except in product"); }
+}
+// Used by the DFA in dfa_sparc.cpp.  Check for a prior FastLock
+// acting as an Acquire and thus we don't need an Acquire here.  We
+// retain the Node to act as a compiler ordering barrier.
+static bool prior_fast_lock( const Node *acq );
+// Used by the DFA in dfa_sparc.cpp.  Check for a following
+// FastUnLock acting as a Release and thus we don't need a Release
+// here.  We retain the Node to act as a compiler ordering barrier.
+static bool post_fast_unlock( const Node *rel );
+// Check for a following volatile memory barrier without an
+// intervening load and thus we don't need a barrier here.  We
+// retain the Node to act as a compiler ordering barrier.
+static bool post_store_load_barrier(const Node* mb);
+#ifdef ASSERT
+void dump_old2new_map();      // machine-independent to machine-dependent
+#endif
+};

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comparison src/share/vm/opto/matcher.hpp @ 0:a61af66fc99e jdk7-b24