Mercurial > hg > truffle
annotate src/share/vm/opto/cfgnode.hpp @ 10408:836a62f43af9
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 19 Jun 2013 10:45:56 +0200 |
| parents | d092d1b31229 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_OPTO_CFGNODE_HPP |
| 26 #define SHARE_VM_OPTO_CFGNODE_HPP | |
| 27 | |
| 28 #include "opto/multnode.hpp" | |
| 29 #include "opto/node.hpp" | |
| 30 #include "opto/opcodes.hpp" | |
| 31 #include "opto/type.hpp" | |
| 32 | |
| 0 | 33 // Portions of code courtesy of Clifford Click |
| 34 | |
| 35 // Optimization - Graph Style | |
| 36 | |
| 37 class Matcher; | |
| 38 class Node; | |
| 39 class RegionNode; | |
| 40 class TypeNode; | |
| 41 class PhiNode; | |
| 42 class GotoNode; | |
| 43 class MultiNode; | |
| 44 class MultiBranchNode; | |
| 45 class IfNode; | |
| 46 class PCTableNode; | |
| 47 class JumpNode; | |
| 48 class CatchNode; | |
| 49 class NeverBranchNode; | |
| 50 class ProjNode; | |
| 51 class CProjNode; | |
| 52 class IfTrueNode; | |
| 53 class IfFalseNode; | |
| 54 class CatchProjNode; | |
| 55 class JProjNode; | |
| 56 class JumpProjNode; | |
| 57 class SCMemProjNode; | |
| 58 class PhaseIdealLoop; | |
| 59 | |
| 60 //------------------------------RegionNode------------------------------------- | |
| 61 // The class of RegionNodes, which can be mapped to basic blocks in the | |
| 62 // program. Their inputs point to Control sources. PhiNodes (described | |
| 63 // below) have an input point to a RegionNode. Merged data inputs to PhiNodes | |
| 64 // correspond 1-to-1 with RegionNode inputs. The zero input of a PhiNode is | |
| 65 // the RegionNode, and the zero input of the RegionNode is itself. | |
| 66 class RegionNode : public Node { | |
| 67 public: | |
| 68 // Node layout (parallels PhiNode): | |
| 69 enum { Region, // Generally points to self. | |
| 70 Control // Control arcs are [1..len) | |
| 71 }; | |
| 72 | |
| 73 RegionNode( uint required ) : Node(required) { | |
| 74 init_class_id(Class_Region); | |
| 75 init_req(0,this); | |
| 76 } | |
| 77 | |
| 78 Node* is_copy() const { | |
| 79 const Node* r = _in[Region]; | |
| 80 if (r == NULL) | |
| 81 return nonnull_req(); | |
| 82 return NULL; // not a copy! | |
| 83 } | |
| 84 PhiNode* has_phi() const; // returns an arbitrary phi user, or NULL | |
| 85 PhiNode* has_unique_phi() const; // returns the unique phi user, or NULL | |
| 86 // Is this region node unreachable from root? | |
| 87 bool is_unreachable_region(PhaseGVN *phase) const; | |
| 88 virtual int Opcode() const; | |
| 89 virtual bool pinned() const { return (const Node *)in(0) == this; } | |
| 90 virtual bool is_CFG () const { return true; } | |
| 91 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash | |
| 92 virtual bool depends_only_on_test() const { return false; } | |
| 93 virtual const Type *bottom_type() const { return Type::CONTROL; } | |
| 94 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 95 virtual Node *Identity( PhaseTransform *phase ); | |
| 96 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 97 virtual const RegMask &out_RegMask() const; | |
| 7473 | 98 bool try_clean_mem_phi(PhaseGVN *phase); |
| 0 | 99 }; |
| 100 | |
| 101 //------------------------------JProjNode-------------------------------------- | |
| 102 // jump projection for node that produces multiple control-flow paths | |
| 103 class JProjNode : public ProjNode { | |
| 104 public: | |
| 105 JProjNode( Node* ctrl, uint idx ) : ProjNode(ctrl,idx) {} | |
| 106 virtual int Opcode() const; | |
| 107 virtual bool is_CFG() const { return true; } | |
| 108 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash | |
| 109 virtual const Node* is_block_proj() const { return in(0); } | |
| 110 virtual const RegMask& out_RegMask() const; | |
| 111 virtual uint ideal_reg() const { return 0; } | |
| 112 }; | |
| 113 | |
| 114 //------------------------------PhiNode---------------------------------------- | |
| 115 // PhiNodes merge values from different Control paths. Slot 0 points to the | |
| 116 // controlling RegionNode. Other slots map 1-for-1 with incoming control flow | |
| 117 // paths to the RegionNode. For speed reasons (to avoid another pass) we | |
| 118 // can turn PhiNodes into copys in-place by NULL'ing out their RegionNode | |
| 119 // input in slot 0. | |
| 120 class PhiNode : public TypeNode { | |
| 121 const TypePtr* const _adr_type; // non-null only for Type::MEMORY nodes. | |
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122 const int _inst_id; // Instance id of the memory slice. |
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123 const int _inst_index; // Alias index of the instance memory slice. |
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124 // Array elements references have the same alias_idx but different offset. |
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125 const int _inst_offset; // Offset of the instance memory slice. |
| 0 | 126 // Size is bigger to hold the _adr_type field. |
| 127 virtual uint hash() const; // Check the type | |
| 128 virtual uint cmp( const Node &n ) const; | |
| 129 virtual uint size_of() const { return sizeof(*this); } | |
| 130 | |
| 131 // Determine if CMoveNode::is_cmove_id can be used at this join point. | |
| 132 Node* is_cmove_id(PhaseTransform* phase, int true_path); | |
| 133 | |
| 134 public: | |
| 135 // Node layout (parallels RegionNode): | |
| 136 enum { Region, // Control input is the Phi's region. | |
| 137 Input // Input values are [1..len) | |
| 138 }; | |
| 139 | |
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140 PhiNode( Node *r, const Type *t, const TypePtr* at = NULL, |
| 223 | 141 const int iid = TypeOopPtr::InstanceTop, |
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142 const int iidx = Compile::AliasIdxTop, |
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143 const int ioffs = Type::OffsetTop ) |
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144 : TypeNode(t,r->req()), |
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145 _adr_type(at), |
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146 _inst_id(iid), |
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147 _inst_index(iidx), |
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148 _inst_offset(ioffs) |
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149 { |
| 0 | 150 init_class_id(Class_Phi); |
| 151 init_req(0, r); | |
| 152 verify_adr_type(); | |
| 153 } | |
| 154 // create a new phi with in edges matching r and set (initially) to x | |
| 155 static PhiNode* make( Node* r, Node* x ); | |
| 156 // extra type arguments override the new phi's bottom_type and adr_type | |
| 157 static PhiNode* make( Node* r, Node* x, const Type *t, const TypePtr* at = NULL ); | |
| 158 // create a new phi with narrowed memory type | |
| 159 PhiNode* slice_memory(const TypePtr* adr_type) const; | |
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160 PhiNode* split_out_instance(const TypePtr* at, PhaseIterGVN *igvn) const; |
| 0 | 161 // like make(r, x), but does not initialize the in edges to x |
| 162 static PhiNode* make_blank( Node* r, Node* x ); | |
| 163 | |
| 164 // Accessors | |
| 165 RegionNode* region() const { Node* r = in(Region); assert(!r || r->is_Region(), ""); return (RegionNode*)r; } | |
| 166 | |
| 167 Node* is_copy() const { | |
| 168 // The node is a real phi if _in[0] is a Region node. | |
| 169 DEBUG_ONLY(const Node* r = _in[Region];) | |
| 170 assert(r != NULL && r->is_Region(), "Not valid control"); | |
| 171 return NULL; // not a copy! | |
| 172 } | |
| 173 | |
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174 bool is_tripcount() const; |
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175 |
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176 // Determine a unique non-trivial input, if any. |
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177 // Ignore casts if it helps. Return NULL on failure. |
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178 Node* unique_input(PhaseTransform *phase); |
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179 |
| 0 | 180 // Check for a simple dead loop. |
| 181 enum LoopSafety { Safe = 0, Unsafe, UnsafeLoop }; | |
| 182 LoopSafety simple_data_loop_check(Node *in) const; | |
| 183 // Is it unsafe data loop? It becomes a dead loop if this phi node removed. | |
| 184 bool is_unsafe_data_reference(Node *in) const; | |
| 7473 | 185 int is_diamond_phi(bool check_control_only = false) const; |
| 0 | 186 virtual int Opcode() const; |
| 187 virtual bool pinned() const { return in(0) != 0; } | |
| 188 virtual const TypePtr *adr_type() const { verify_adr_type(true); return _adr_type; } | |
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189 |
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190 const int inst_id() const { return _inst_id; } |
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191 const int inst_index() const { return _inst_index; } |
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192 const int inst_offset() const { return _inst_offset; } |
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193 bool is_same_inst_field(const Type* tp, int id, int index, int offset) { |
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194 return type()->basic_type() == tp->basic_type() && |
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195 inst_id() == id && |
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196 inst_index() == index && |
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197 inst_offset() == offset && |
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198 type()->higher_equal(tp); |
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199 } |
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200 |
| 0 | 201 virtual const Type *Value( PhaseTransform *phase ) const; |
| 202 virtual Node *Identity( PhaseTransform *phase ); | |
| 203 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 204 virtual const RegMask &out_RegMask() const; | |
| 205 virtual const RegMask &in_RegMask(uint) const; | |
| 206 #ifndef PRODUCT | |
| 207 virtual void dump_spec(outputStream *st) const; | |
| 208 #endif | |
| 209 #ifdef ASSERT | |
| 210 void verify_adr_type(VectorSet& visited, const TypePtr* at) const; | |
| 211 void verify_adr_type(bool recursive = false) const; | |
| 212 #else //ASSERT | |
| 213 void verify_adr_type(bool recursive = false) const {} | |
| 214 #endif //ASSERT | |
| 215 }; | |
| 216 | |
| 217 //------------------------------GotoNode--------------------------------------- | |
| 218 // GotoNodes perform direct branches. | |
| 219 class GotoNode : public Node { | |
| 220 public: | |
| 3842 | 221 GotoNode( Node *control ) : Node(control) {} |
| 0 | 222 virtual int Opcode() const; |
| 223 virtual bool pinned() const { return true; } | |
| 224 virtual bool is_CFG() const { return true; } | |
| 225 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash | |
| 226 virtual const Node *is_block_proj() const { return this; } | |
| 227 virtual bool depends_only_on_test() const { return false; } | |
| 228 virtual const Type *bottom_type() const { return Type::CONTROL; } | |
| 229 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 230 virtual Node *Identity( PhaseTransform *phase ); | |
| 231 virtual const RegMask &out_RegMask() const; | |
| 232 }; | |
| 233 | |
| 234 //------------------------------CProjNode-------------------------------------- | |
| 235 // control projection for node that produces multiple control-flow paths | |
| 236 class CProjNode : public ProjNode { | |
| 237 public: | |
| 238 CProjNode( Node *ctrl, uint idx ) : ProjNode(ctrl,idx) {} | |
| 239 virtual int Opcode() const; | |
| 240 virtual bool is_CFG() const { return true; } | |
| 241 virtual uint hash() const { return NO_HASH; } // CFG nodes do not hash | |
| 242 virtual const Node *is_block_proj() const { return in(0); } | |
| 243 virtual const RegMask &out_RegMask() const; | |
| 244 virtual uint ideal_reg() const { return 0; } | |
| 245 }; | |
| 246 | |
| 247 //---------------------------MultiBranchNode----------------------------------- | |
| 248 // This class defines a MultiBranchNode, a MultiNode which yields multiple | |
| 249 // control values. These are distinguished from other types of MultiNodes | |
| 250 // which yield multiple values, but control is always and only projection #0. | |
| 251 class MultiBranchNode : public MultiNode { | |
| 252 public: | |
| 253 MultiBranchNode( uint required ) : MultiNode(required) { | |
| 254 init_class_id(Class_MultiBranch); | |
| 255 } | |
| 127 | 256 // returns required number of users to be well formed. |
| 257 virtual int required_outcnt() const = 0; | |
| 0 | 258 }; |
| 259 | |
| 260 //------------------------------IfNode----------------------------------------- | |
| 261 // Output selected Control, based on a boolean test | |
| 262 class IfNode : public MultiBranchNode { | |
| 263 // Size is bigger to hold the probability field. However, _prob does not | |
| 264 // change the semantics so it does not appear in the hash & cmp functions. | |
| 265 virtual uint size_of() const { return sizeof(*this); } | |
| 266 public: | |
| 267 | |
| 268 // Degrees of branch prediction probability by order of magnitude: | |
| 269 // PROB_UNLIKELY_1e(N) is a 1 in 1eN chance. | |
| 270 // PROB_LIKELY_1e(N) is a 1 - PROB_UNLIKELY_1e(N) | |
| 271 #define PROB_UNLIKELY_MAG(N) (1e- ## N ## f) | |
| 272 #define PROB_LIKELY_MAG(N) (1.0f-PROB_UNLIKELY_MAG(N)) | |
| 273 | |
| 274 // Maximum and minimum branch prediction probabilties | |
| 275 // 1 in 1,000,000 (magnitude 6) | |
| 276 // | |
| 277 // Although PROB_NEVER == PROB_MIN and PROB_ALWAYS == PROB_MAX | |
| 278 // they are used to distinguish different situations: | |
| 279 // | |
| 280 // The name PROB_MAX (PROB_MIN) is for probabilities which correspond to | |
| 281 // very likely (unlikely) but with a concrete possibility of a rare | |
| 282 // contrary case. These constants would be used for pinning | |
| 283 // measurements, and as measures for assertions that have high | |
| 284 // confidence, but some evidence of occasional failure. | |
| 285 // | |
| 286 // The name PROB_ALWAYS (PROB_NEVER) is to stand for situations for which | |
| 287 // there is no evidence at all that the contrary case has ever occurred. | |
| 288 | |
| 289 #define PROB_NEVER PROB_UNLIKELY_MAG(6) | |
| 290 #define PROB_ALWAYS PROB_LIKELY_MAG(6) | |
| 291 | |
| 292 #define PROB_MIN PROB_UNLIKELY_MAG(6) | |
| 293 #define PROB_MAX PROB_LIKELY_MAG(6) | |
| 294 | |
| 295 // Static branch prediction probabilities | |
| 296 // 1 in 10 (magnitude 1) | |
| 297 #define PROB_STATIC_INFREQUENT PROB_UNLIKELY_MAG(1) | |
| 298 #define PROB_STATIC_FREQUENT PROB_LIKELY_MAG(1) | |
| 299 | |
| 300 // Fair probability 50/50 | |
| 301 #define PROB_FAIR (0.5f) | |
| 302 | |
| 303 // Unknown probability sentinel | |
| 304 #define PROB_UNKNOWN (-1.0f) | |
| 305 | |
| 306 // Probability "constructors", to distinguish as a probability any manifest | |
| 307 // constant without a names | |
| 308 #define PROB_LIKELY(x) ((float) (x)) | |
| 309 #define PROB_UNLIKELY(x) (1.0f - (float)(x)) | |
| 310 | |
| 311 // Other probabilities in use, but without a unique name, are documented | |
| 312 // here for lack of a better place: | |
| 313 // | |
| 314 // 1 in 1000 probabilities (magnitude 3): | |
| 315 // threshold for converting to conditional move | |
| 316 // likelihood of null check failure if a null HAS been seen before | |
| 317 // likelihood of slow path taken in library calls | |
| 318 // | |
| 319 // 1 in 10,000 probabilities (magnitude 4): | |
| 320 // threshold for making an uncommon trap probability more extreme | |
| 321 // threshold for for making a null check implicit | |
| 322 // likelihood of needing a gc if eden top moves during an allocation | |
| 323 // likelihood of a predicted call failure | |
| 324 // | |
| 325 // 1 in 100,000 probabilities (magnitude 5): | |
| 326 // threshold for ignoring counts when estimating path frequency | |
| 327 // likelihood of FP clipping failure | |
| 328 // likelihood of catching an exception from a try block | |
| 329 // likelihood of null check failure if a null has NOT been seen before | |
| 330 // | |
| 331 // Magic manifest probabilities such as 0.83, 0.7, ... can be found in | |
| 332 // gen_subtype_check() and catch_inline_exceptions(). | |
| 333 | |
| 334 float _prob; // Probability of true path being taken. | |
| 335 float _fcnt; // Frequency counter | |
| 336 IfNode( Node *control, Node *b, float p, float fcnt ) | |
| 337 : MultiBranchNode(2), _prob(p), _fcnt(fcnt) { | |
| 338 init_class_id(Class_If); | |
| 339 init_req(0,control); | |
| 340 init_req(1,b); | |
| 341 } | |
| 342 virtual int Opcode() const; | |
| 343 virtual bool pinned() const { return true; } | |
| 344 virtual const Type *bottom_type() const { return TypeTuple::IFBOTH; } | |
| 345 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 346 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 127 | 347 virtual int required_outcnt() const { return 2; } |
| 0 | 348 virtual const RegMask &out_RegMask() const; |
| 349 void dominated_by(Node* prev_dom, PhaseIterGVN* igvn); | |
| 350 int is_range_check(Node* &range, Node* &index, jint &offset); | |
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351 Node* fold_compares(PhaseGVN* phase); |
| 0 | 352 static Node* up_one_dom(Node* curr, bool linear_only = false); |
| 353 | |
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354 // Takes the type of val and filters it through the test represented |
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355 // by if_proj and returns a more refined type if one is produced. |
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356 // Returns NULL is it couldn't improve the type. |
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357 static const TypeInt* filtered_int_type(PhaseGVN* phase, Node* val, Node* if_proj); |
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358 |
| 0 | 359 #ifndef PRODUCT |
| 360 virtual void dump_spec(outputStream *st) const; | |
| 361 #endif | |
| 362 }; | |
| 363 | |
| 364 class IfTrueNode : public CProjNode { | |
| 365 public: | |
| 366 IfTrueNode( IfNode *ifnode ) : CProjNode(ifnode,1) { | |
| 367 init_class_id(Class_IfTrue); | |
| 368 } | |
| 369 virtual int Opcode() const; | |
| 370 virtual Node *Identity( PhaseTransform *phase ); | |
| 371 }; | |
| 372 | |
| 373 class IfFalseNode : public CProjNode { | |
| 374 public: | |
| 375 IfFalseNode( IfNode *ifnode ) : CProjNode(ifnode,0) { | |
| 376 init_class_id(Class_IfFalse); | |
| 377 } | |
| 378 virtual int Opcode() const; | |
| 379 virtual Node *Identity( PhaseTransform *phase ); | |
| 380 }; | |
| 381 | |
| 382 | |
| 383 //------------------------------PCTableNode------------------------------------ | |
| 384 // Build an indirect branch table. Given a control and a table index, | |
| 385 // control is passed to the Projection matching the table index. Used to | |
| 386 // implement switch statements and exception-handling capabilities. | |
| 387 // Undefined behavior if passed-in index is not inside the table. | |
| 388 class PCTableNode : public MultiBranchNode { | |
| 389 virtual uint hash() const; // Target count; table size | |
| 390 virtual uint cmp( const Node &n ) const; | |
| 391 virtual uint size_of() const { return sizeof(*this); } | |
| 392 | |
| 393 public: | |
| 394 const uint _size; // Number of targets | |
| 395 | |
| 396 PCTableNode( Node *ctrl, Node *idx, uint size ) : MultiBranchNode(2), _size(size) { | |
| 397 init_class_id(Class_PCTable); | |
| 398 init_req(0, ctrl); | |
| 399 init_req(1, idx); | |
| 400 } | |
| 401 virtual int Opcode() const; | |
| 402 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 403 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 404 virtual const Type *bottom_type() const; | |
| 405 virtual bool pinned() const { return true; } | |
| 127 | 406 virtual int required_outcnt() const { return _size; } |
| 0 | 407 }; |
| 408 | |
| 409 //------------------------------JumpNode--------------------------------------- | |
| 410 // Indirect branch. Uses PCTable above to implement a switch statement. | |
| 411 // It emits as a table load and local branch. | |
| 412 class JumpNode : public PCTableNode { | |
| 413 public: | |
| 414 JumpNode( Node* control, Node* switch_val, uint size) : PCTableNode(control, switch_val, size) { | |
| 415 init_class_id(Class_Jump); | |
| 416 } | |
| 417 virtual int Opcode() const; | |
| 418 virtual const RegMask& out_RegMask() const; | |
| 419 virtual const Node* is_block_proj() const { return this; } | |
| 420 }; | |
| 421 | |
| 422 class JumpProjNode : public JProjNode { | |
| 423 virtual uint hash() const; | |
| 424 virtual uint cmp( const Node &n ) const; | |
| 425 virtual uint size_of() const { return sizeof(*this); } | |
| 426 | |
| 427 private: | |
| 428 const int _dest_bci; | |
| 429 const uint _proj_no; | |
| 430 const int _switch_val; | |
| 431 public: | |
| 432 JumpProjNode(Node* jumpnode, uint proj_no, int dest_bci, int switch_val) | |
| 433 : JProjNode(jumpnode, proj_no), _dest_bci(dest_bci), _proj_no(proj_no), _switch_val(switch_val) { | |
| 434 init_class_id(Class_JumpProj); | |
| 435 } | |
| 436 | |
| 437 virtual int Opcode() const; | |
| 438 virtual const Type* bottom_type() const { return Type::CONTROL; } | |
| 439 int dest_bci() const { return _dest_bci; } | |
| 440 int switch_val() const { return _switch_val; } | |
| 441 uint proj_no() const { return _proj_no; } | |
| 442 #ifndef PRODUCT | |
| 443 virtual void dump_spec(outputStream *st) const; | |
| 444 #endif | |
| 445 }; | |
| 446 | |
| 447 //------------------------------CatchNode-------------------------------------- | |
| 448 // Helper node to fork exceptions. "Catch" catches any exceptions thrown by | |
| 449 // a just-prior call. Looks like a PCTableNode but emits no code - just the | |
| 450 // table. The table lookup and branch is implemented by RethrowNode. | |
| 451 class CatchNode : public PCTableNode { | |
| 452 public: | |
| 453 CatchNode( Node *ctrl, Node *idx, uint size ) : PCTableNode(ctrl,idx,size){ | |
| 454 init_class_id(Class_Catch); | |
| 455 } | |
| 456 virtual int Opcode() const; | |
| 457 virtual const Type *Value( PhaseTransform *phase ) const; | |
| 458 }; | |
| 459 | |
| 460 // CatchProjNode controls which exception handler is targetted after a call. | |
| 461 // It is passed in the bci of the target handler, or no_handler_bci in case | |
| 462 // the projection doesn't lead to an exception handler. | |
| 463 class CatchProjNode : public CProjNode { | |
| 464 virtual uint hash() const; | |
| 465 virtual uint cmp( const Node &n ) const; | |
| 466 virtual uint size_of() const { return sizeof(*this); } | |
| 467 | |
| 468 private: | |
| 469 const int _handler_bci; | |
| 470 | |
| 471 public: | |
| 472 enum { | |
| 473 fall_through_index = 0, // the fall through projection index | |
| 474 catch_all_index = 1, // the projection index for catch-alls | |
| 475 no_handler_bci = -1 // the bci for fall through or catch-all projs | |
| 476 }; | |
| 477 | |
| 478 CatchProjNode(Node* catchnode, uint proj_no, int handler_bci) | |
| 479 : CProjNode(catchnode, proj_no), _handler_bci(handler_bci) { | |
| 480 init_class_id(Class_CatchProj); | |
| 481 assert(proj_no != fall_through_index || handler_bci < 0, "fall through case must have bci < 0"); | |
| 482 } | |
| 483 | |
| 484 virtual int Opcode() const; | |
| 485 virtual Node *Identity( PhaseTransform *phase ); | |
| 486 virtual const Type *bottom_type() const { return Type::CONTROL; } | |
| 487 int handler_bci() const { return _handler_bci; } | |
| 488 bool is_handler_proj() const { return _handler_bci >= 0; } | |
| 489 #ifndef PRODUCT | |
| 490 virtual void dump_spec(outputStream *st) const; | |
| 491 #endif | |
| 492 }; | |
| 493 | |
| 494 | |
| 495 //---------------------------------CreateExNode-------------------------------- | |
| 496 // Helper node to create the exception coming back from a call | |
| 497 class CreateExNode : public TypeNode { | |
| 498 public: | |
| 499 CreateExNode(const Type* t, Node* control, Node* i_o) : TypeNode(t, 2) { | |
| 500 init_req(0, control); | |
| 501 init_req(1, i_o); | |
| 502 } | |
| 503 virtual int Opcode() const; | |
| 504 virtual Node *Identity( PhaseTransform *phase ); | |
| 505 virtual bool pinned() const { return true; } | |
| 506 uint match_edge(uint idx) const { return 0; } | |
| 507 virtual uint ideal_reg() const { return Op_RegP; } | |
| 508 }; | |
| 509 | |
| 510 //------------------------------NeverBranchNode------------------------------- | |
| 511 // The never-taken branch. Used to give the appearance of exiting infinite | |
| 512 // loops to those algorithms that like all paths to be reachable. Encodes | |
| 513 // empty. | |
| 514 class NeverBranchNode : public MultiBranchNode { | |
| 515 public: | |
| 516 NeverBranchNode( Node *ctrl ) : MultiBranchNode(1) { init_req(0,ctrl); } | |
| 517 virtual int Opcode() const; | |
| 518 virtual bool pinned() const { return true; }; | |
| 519 virtual const Type *bottom_type() const { return TypeTuple::IFBOTH; } | |
| 127 | 520 virtual const Type *Value( PhaseTransform *phase ) const; |
| 521 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape); | |
| 522 virtual int required_outcnt() const { return 2; } | |
| 0 | 523 virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const { } |
| 524 virtual uint size(PhaseRegAlloc *ra_) const { return 0; } | |
| 525 #ifndef PRODUCT | |
| 526 virtual void format( PhaseRegAlloc *, outputStream *st ) const; | |
| 527 #endif | |
| 528 }; | |
| 1972 | 529 |
| 530 #endif // SHARE_VM_OPTO_CFGNODE_HPP |