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annotate src/share/vm/opto/cfgnode.hpp @ 14702:d4dd5204c0aa
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author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
parents | d092d1b31229 |
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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 * | |
1552
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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 |