SelectionDAGNodes.h revision 762f2ae0c4c07a93fd2f830fb079692dbccef85c
1//===-- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ---*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file declares the SDNode class and derived classes, which are used to 11// represent the nodes and operations present in a SelectionDAG. These nodes 12// and operations are machine code level operations, with some similarities to 13// the GCC RTL representation. 14// 15// Clients should include the SelectionDAG.h file instead of this file directly. 16// 17//===----------------------------------------------------------------------===// 18 19#ifndef LLVM_CODEGEN_SELECTIONDAGNODES_H 20#define LLVM_CODEGEN_SELECTIONDAGNODES_H 21 22#include "llvm/CodeGen/ValueTypes.h" 23#include "llvm/Value.h" 24#include "llvm/ADT/GraphTraits.h" 25#include "llvm/ADT/iterator" 26#include "llvm/Support/DataTypes.h" 27#include <cassert> 28#include <vector> 29 30namespace llvm { 31 32class SelectionDAG; 33class GlobalValue; 34class MachineBasicBlock; 35class SDNode; 36template <typename T> struct simplify_type; 37template <typename T> struct ilist_traits; 38template<typename NodeTy, typename Traits> class iplist; 39template<typename NodeTy> class ilist_iterator; 40 41/// ISD namespace - This namespace contains an enum which represents all of the 42/// SelectionDAG node types and value types. 43/// 44namespace ISD { 45 //===--------------------------------------------------------------------===// 46 /// ISD::NodeType enum - This enum defines all of the operators valid in a 47 /// SelectionDAG. 48 /// 49 enum NodeType { 50 // EntryToken - This is the marker used to indicate the start of the region. 51 EntryToken, 52 53 // Token factor - This node takes multiple tokens as input and produces a 54 // single token result. This is used to represent the fact that the operand 55 // operators are independent of each other. 56 TokenFactor, 57 58 // AssertSext, AssertZext - These nodes record if a register contains a 59 // value that has already been zero or sign extended from a narrower type. 60 // These nodes take two operands. The first is the node that has already 61 // been extended, and the second is a value type node indicating the width 62 // of the extension 63 AssertSext, AssertZext, 64 65 // Various leaf nodes. 66 STRING, BasicBlock, VALUETYPE, CONDCODE, Register, 67 Constant, ConstantFP, 68 GlobalAddress, FrameIndex, ConstantPool, ExternalSymbol, 69 70 // TargetConstant* - Like Constant*, but the DAG does not do any folding or 71 // simplification of the constant. 72 TargetConstant, 73 TargetConstantFP, 74 75 // TargetGlobalAddress - Like GlobalAddress, but the DAG does no folding or 76 // anything else with this node, and this is valid in the target-specific 77 // dag, turning into a GlobalAddress operand. 78 TargetGlobalAddress, 79 TargetFrameIndex, 80 TargetConstantPool, 81 TargetExternalSymbol, 82 83 // CopyToReg - This node has three operands: a chain, a register number to 84 // set to this value, and a value. 85 CopyToReg, 86 87 // CopyFromReg - This node indicates that the input value is a virtual or 88 // physical register that is defined outside of the scope of this 89 // SelectionDAG. The register is available from the RegSDNode object. 90 CopyFromReg, 91 92 // UNDEF - An undefined node 93 UNDEF, 94 95 // EXTRACT_ELEMENT - This is used to get the first or second (determined by 96 // a Constant, which is required to be operand #1), element of the aggregate 97 // value specified as operand #0. This is only for use before legalization, 98 // for values that will be broken into multiple registers. 99 EXTRACT_ELEMENT, 100 101 // BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways. Given 102 // two values of the same integer value type, this produces a value twice as 103 // big. Like EXTRACT_ELEMENT, this can only be used before legalization. 104 BUILD_PAIR, 105 106 // MERGE_VALUES - This node takes multiple discrete operands and returns 107 // them all as its individual results. This nodes has exactly the same 108 // number of inputs and outputs, and is only valid before legalization. 109 // This node is useful for some pieces of the code generator that want to 110 // think about a single node with multiple results, not multiple nodes. 111 MERGE_VALUES, 112 113 // Simple integer binary arithmetic operators. 114 ADD, SUB, MUL, SDIV, UDIV, SREM, UREM, 115 116 // Carry-setting nodes for multiple precision addition and subtraction. 117 // These nodes take two operands of the same value type, and produce two 118 // results. The first result is the normal add or sub result, the second 119 // result is the carry flag result. 120 ADDC, SUBC, 121 122 // Carry-using nodes for multiple precision addition and subtraction. These 123 // nodes take three operands: The first two are the normal lhs and rhs to 124 // the add or sub, and the third is the input carry flag. These nodes 125 // produce two results; the normal result of the add or sub, and the output 126 // carry flag. These nodes both read and write a carry flag to allow them 127 // to them to be chained together for add and sub of arbitrarily large 128 // values. 129 ADDE, SUBE, 130 131 // Simple binary floating point operators. 132 FADD, FSUB, FMUL, FDIV, FREM, 133 134 // FCOPYSIGN(X, Y) - Return the value of X with the sign of Y. NOTE: This 135 // DAG node does not require that X and Y have the same type, just that they 136 // are both floating point. X and the result must have the same type. 137 // FCOPYSIGN(f32, f64) is allowed. 138 FCOPYSIGN, 139 140 /// VBUILD_VECTOR(ELT1, ELT2, ELT3, ELT4,..., COUNT,TYPE) - Return a vector 141 /// with the specified, possibly variable, elements. The number of elements 142 /// is required to be a power of two. 143 VBUILD_VECTOR, 144 145 /// BUILD_VECTOR(ELT1, ELT2, ELT3, ELT4,...) - Return a vector 146 /// with the specified, possibly variable, elements. The number of elements 147 /// is required to be a power of two. 148 BUILD_VECTOR, 149 150 /// VINSERT_VECTOR_ELT(VECTOR, VAL, IDX, COUNT,TYPE) - Given a vector 151 /// VECTOR, an element ELEMENT, and a (potentially variable) index IDX, 152 /// return an vector with the specified element of VECTOR replaced with VAL. 153 /// COUNT and TYPE specify the type of vector, as is standard for V* nodes. 154 VINSERT_VECTOR_ELT, 155 156 /// INSERT_VECTOR_ELT(VECTOR, VAL, IDX) - Returns VECTOR (a legal packed 157 /// type) with the element at IDX replaced with VAL. 158 INSERT_VECTOR_ELT, 159 160 /// VEXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR 161 /// (an MVT::Vector value) identified by the (potentially variable) element 162 /// number IDX. 163 VEXTRACT_VECTOR_ELT, 164 165 /// EXTRACT_VECTOR_ELT(VECTOR, IDX) - Returns a single element from VECTOR 166 /// (a legal packed type vector) identified by the (potentially variable) 167 /// element number IDX. 168 EXTRACT_VECTOR_ELT, 169 170 /// VECTOR_SHUFFLE(VEC1, VEC2, SHUFFLEVEC) - Returns a vector, of the same 171 /// type as VEC1/VEC2. SHUFFLEVEC is a BUILD_VECTOR of constant int values 172 /// (regardless of whether its datatype is legal or not) that indicate 173 /// which value each result element will get. The elements of VEC1/VEC2 are 174 /// enumerated in order. This is quite similar to the Altivec 'vperm' 175 /// instruction, except that the indices must be constants and are in terms 176 /// of the element size of VEC1/VEC2, not in terms of bytes. 177 VECTOR_SHUFFLE, 178 179 /// X = VBIT_CONVERT(Y) and X = VBIT_CONVERT(Y, COUNT,TYPE) - This node 180 /// represents a conversion from or to an ISD::Vector type. 181 /// 182 /// This is lowered to a BIT_CONVERT of the appropriate input/output types. 183 /// The input and output are required to have the same size and at least one 184 /// is required to be a vector. 185 /// 186 /// If the source is a vector, this takes three operands (like any other 187 /// vector consumer) which indicate the size and type of the vector input. 188 /// Otherwise it takes one input. 189 VBIT_CONVERT, 190 191 /// BINOP(LHS, RHS, COUNT,TYPE) 192 /// Simple abstract vector operators. Unlike the integer and floating point 193 /// binary operators, these nodes also take two additional operands: 194 /// a constant element count, and a value type node indicating the type of 195 /// the elements. The order is count, type, op0, op1. All vector opcodes, 196 /// including VLOAD and VConstant must currently have count and type as 197 /// their last two operands. 198 VADD, VSUB, VMUL, VSDIV, VUDIV, 199 VAND, VOR, VXOR, 200 201 /// SCALAR_TO_VECTOR(VAL) - This represents the operation of loading a 202 /// scalar value into the low element of the resultant vector type. The top 203 /// elements of the vector are undefined. 204 SCALAR_TO_VECTOR, 205 206 // MULHU/MULHS - Multiply high - Multiply two integers of type iN, producing 207 // an unsigned/signed value of type i[2*n], then return the top part. 208 MULHU, MULHS, 209 210 // Bitwise operators - logical and, logical or, logical xor, shift left, 211 // shift right algebraic (shift in sign bits), shift right logical (shift in 212 // zeroes), rotate left, rotate right, and byteswap. 213 AND, OR, XOR, SHL, SRA, SRL, ROTL, ROTR, BSWAP, 214 215 // Counting operators 216 CTTZ, CTLZ, CTPOP, 217 218 // Select(COND, TRUEVAL, FALSEVAL) 219 SELECT, 220 221 // Select with condition operator - This selects between a true value and 222 // a false value (ops #2 and #3) based on the boolean result of comparing 223 // the lhs and rhs (ops #0 and #1) of a conditional expression with the 224 // condition code in op #4, a CondCodeSDNode. 225 SELECT_CC, 226 227 // SetCC operator - This evaluates to a boolean (i1) true value if the 228 // condition is true. The operands to this are the left and right operands 229 // to compare (ops #0, and #1) and the condition code to compare them with 230 // (op #2) as a CondCodeSDNode. 231 SETCC, 232 233 // SHL_PARTS/SRA_PARTS/SRL_PARTS - These operators are used for expanded 234 // integer shift operations, just like ADD/SUB_PARTS. The operation 235 // ordering is: 236 // [Lo,Hi] = op [LoLHS,HiLHS], Amt 237 SHL_PARTS, SRA_PARTS, SRL_PARTS, 238 239 // Conversion operators. These are all single input single output 240 // operations. For all of these, the result type must be strictly 241 // wider or narrower (depending on the operation) than the source 242 // type. 243 244 // SIGN_EXTEND - Used for integer types, replicating the sign bit 245 // into new bits. 246 SIGN_EXTEND, 247 248 // ZERO_EXTEND - Used for integer types, zeroing the new bits. 249 ZERO_EXTEND, 250 251 // ANY_EXTEND - Used for integer types. The high bits are undefined. 252 ANY_EXTEND, 253 254 // TRUNCATE - Completely drop the high bits. 255 TRUNCATE, 256 257 // [SU]INT_TO_FP - These operators convert integers (whose interpreted sign 258 // depends on the first letter) to floating point. 259 SINT_TO_FP, 260 UINT_TO_FP, 261 262 // SIGN_EXTEND_INREG - This operator atomically performs a SHL/SRA pair to 263 // sign extend a small value in a large integer register (e.g. sign 264 // extending the low 8 bits of a 32-bit register to fill the top 24 bits 265 // with the 7th bit). The size of the smaller type is indicated by the 1th 266 // operand, a ValueType node. 267 SIGN_EXTEND_INREG, 268 269 // FP_TO_[US]INT - Convert a floating point value to a signed or unsigned 270 // integer. 271 FP_TO_SINT, 272 FP_TO_UINT, 273 274 // FP_ROUND - Perform a rounding operation from the current 275 // precision down to the specified precision (currently always 64->32). 276 FP_ROUND, 277 278 // FP_ROUND_INREG - This operator takes a floating point register, and 279 // rounds it to a floating point value. It then promotes it and returns it 280 // in a register of the same size. This operation effectively just discards 281 // excess precision. The type to round down to is specified by the 1th 282 // operation, a VTSDNode (currently always 64->32->64). 283 FP_ROUND_INREG, 284 285 // FP_EXTEND - Extend a smaller FP type into a larger FP type. 286 FP_EXTEND, 287 288 // BIT_CONVERT - Theis operator converts between integer and FP values, as 289 // if one was stored to memory as integer and the other was loaded from the 290 // same address (or equivalently for vector format conversions, etc). The 291 // source and result are required to have the same bit size (e.g. 292 // f32 <-> i32). This can also be used for int-to-int or fp-to-fp 293 // conversions, but that is a noop, deleted by getNode(). 294 BIT_CONVERT, 295 296 // FNEG, FABS, FSQRT, FSIN, FCOS - Perform unary floating point negation, 297 // absolute value, square root, sine and cosine operations. 298 FNEG, FABS, FSQRT, FSIN, FCOS, 299 300 // Other operators. LOAD and STORE have token chains as their first 301 // operand, then the same operands as an LLVM load/store instruction, then a 302 // SRCVALUE node that provides alias analysis information. 303 LOAD, STORE, 304 305 // Abstract vector version of LOAD. VLOAD has a constant element count as 306 // the first operand, followed by a value type node indicating the type of 307 // the elements, a token chain, a pointer operand, and a SRCVALUE node. 308 VLOAD, 309 310 // EXTLOAD, SEXTLOAD, ZEXTLOAD - These three operators all load a value from 311 // memory and extend them to a larger value (e.g. load a byte into a word 312 // register). All three of these have four operands, a token chain, a 313 // pointer to load from, a SRCVALUE for alias analysis, and a VALUETYPE node 314 // indicating the type to load. 315 // 316 // SEXTLOAD loads the integer operand and sign extends it to a larger 317 // integer result type. 318 // ZEXTLOAD loads the integer operand and zero extends it to a larger 319 // integer result type. 320 // EXTLOAD is used for three things: floating point extending loads, 321 // integer extending loads [the top bits are undefined], and vector 322 // extending loads [load into low elt]. 323 EXTLOAD, SEXTLOAD, ZEXTLOAD, 324 325 // TRUNCSTORE - This operators truncates (for integer) or rounds (for FP) a 326 // value and stores it to memory in one operation. This can be used for 327 // either integer or floating point operands. The first four operands of 328 // this are the same as a standard store. The fifth is the ValueType to 329 // store it as (which will be smaller than the source value). 330 TRUNCSTORE, 331 332 // DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned 333 // to a specified boundary. The first operand is the token chain, the 334 // second is the number of bytes to allocate, and the third is the alignment 335 // boundary. The size is guaranteed to be a multiple of the stack 336 // alignment, and the alignment is guaranteed to be bigger than the stack 337 // alignment (if required) or 0 to get standard stack alignment. 338 DYNAMIC_STACKALLOC, 339 340 // Control flow instructions. These all have token chains. 341 342 // BR - Unconditional branch. The first operand is the chain 343 // operand, the second is the MBB to branch to. 344 BR, 345 346 // BRCOND - Conditional branch. The first operand is the chain, 347 // the second is the condition, the third is the block to branch 348 // to if the condition is true. 349 BRCOND, 350 351 // BR_CC - Conditional branch. The behavior is like that of SELECT_CC, in 352 // that the condition is represented as condition code, and two nodes to 353 // compare, rather than as a combined SetCC node. The operands in order are 354 // chain, cc, lhs, rhs, block to branch to if condition is true. 355 BR_CC, 356 357 // RET - Return from function. The first operand is the chain, 358 // and any subsequent operands are the return values for the 359 // function. This operation can have variable number of operands. 360 RET, 361 362 // INLINEASM - Represents an inline asm block. This node always has two 363 // return values: a chain and a flag result. The inputs are as follows: 364 // Operand #0 : Input chain. 365 // Operand #1 : a ExternalSymbolSDNode with a pointer to the asm string. 366 // Operand #2n+2: A RegisterNode. 367 // Operand #2n+3: A TargetConstant, indicating if the reg is a use/def 368 // Operand #last: Optional, an incoming flag. 369 INLINEASM, 370 371 // STACKSAVE - STACKSAVE has one operand, an input chain. It produces a 372 // value, the same type as the pointer type for the system, and an output 373 // chain. 374 STACKSAVE, 375 376 // STACKRESTORE has two operands, an input chain and a pointer to restore to 377 // it returns an output chain. 378 STACKRESTORE, 379 380 // MEMSET/MEMCPY/MEMMOVE - The first operand is the chain, and the rest 381 // correspond to the operands of the LLVM intrinsic functions. The only 382 // result is a token chain. The alignment argument is guaranteed to be a 383 // Constant node. 384 MEMSET, 385 MEMMOVE, 386 MEMCPY, 387 388 // CALLSEQ_START/CALLSEQ_END - These operators mark the beginning and end of 389 // a call sequence, and carry arbitrary information that target might want 390 // to know. The first operand is a chain, the rest are specified by the 391 // target and not touched by the DAG optimizers. 392 CALLSEQ_START, // Beginning of a call sequence 393 CALLSEQ_END, // End of a call sequence 394 395 // VAARG - VAARG has three operands: an input chain, a pointer, and a 396 // SRCVALUE. It returns a pair of values: the vaarg value and a new chain. 397 VAARG, 398 399 // VACOPY - VACOPY has five operands: an input chain, a destination pointer, 400 // a source pointer, a SRCVALUE for the destination, and a SRCVALUE for the 401 // source. 402 VACOPY, 403 404 // VAEND, VASTART - VAEND and VASTART have three operands: an input chain, a 405 // pointer, and a SRCVALUE. 406 VAEND, VASTART, 407 408 // SRCVALUE - This corresponds to a Value*, and is used to associate memory 409 // locations with their value. This allows one use alias analysis 410 // information in the backend. 411 SRCVALUE, 412 413 // PCMARKER - This corresponds to the pcmarker intrinsic. 414 PCMARKER, 415 416 // READCYCLECOUNTER - This corresponds to the readcyclecounter intrinsic. 417 // The only operand is a chain and a value and a chain are produced. The 418 // value is the contents of the architecture specific cycle counter like 419 // register (or other high accuracy low latency clock source) 420 READCYCLECOUNTER, 421 422 // HANDLENODE node - Used as a handle for various purposes. 423 HANDLENODE, 424 425 // LOCATION - This node is used to represent a source location for debug 426 // info. It takes token chain as input, then a line number, then a column 427 // number, then a filename, then a working dir. It produces a token chain 428 // as output. 429 LOCATION, 430 431 // DEBUG_LOC - This node is used to represent source line information 432 // embedded in the code. It takes a token chain as input, then a line 433 // number, then a column then a file id (provided by MachineDebugInfo.) It 434 // produces a token chain as output. 435 DEBUG_LOC, 436 437 // DEBUG_LABEL - This node is used to mark a location in the code where a 438 // label should be generated for use by the debug information. It takes a 439 // token chain as input and then a unique id (provided by MachineDebugInfo.) 440 // It produces a token chain as output. 441 DEBUG_LABEL, 442 443 // BUILTIN_OP_END - This must be the last enum value in this list. 444 BUILTIN_OP_END 445 }; 446 447 //===--------------------------------------------------------------------===// 448 /// ISD::CondCode enum - These are ordered carefully to make the bitfields 449 /// below work out, when considering SETFALSE (something that never exists 450 /// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered 451 /// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal 452 /// to. If the "N" column is 1, the result of the comparison is undefined if 453 /// the input is a NAN. 454 /// 455 /// All of these (except for the 'always folded ops') should be handled for 456 /// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT, 457 /// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used. 458 /// 459 /// Note that these are laid out in a specific order to allow bit-twiddling 460 /// to transform conditions. 461 enum CondCode { 462 // Opcode N U L G E Intuitive operation 463 SETFALSE, // 0 0 0 0 Always false (always folded) 464 SETOEQ, // 0 0 0 1 True if ordered and equal 465 SETOGT, // 0 0 1 0 True if ordered and greater than 466 SETOGE, // 0 0 1 1 True if ordered and greater than or equal 467 SETOLT, // 0 1 0 0 True if ordered and less than 468 SETOLE, // 0 1 0 1 True if ordered and less than or equal 469 SETONE, // 0 1 1 0 True if ordered and operands are unequal 470 SETO, // 0 1 1 1 True if ordered (no nans) 471 SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y) 472 SETUEQ, // 1 0 0 1 True if unordered or equal 473 SETUGT, // 1 0 1 0 True if unordered or greater than 474 SETUGE, // 1 0 1 1 True if unordered, greater than, or equal 475 SETULT, // 1 1 0 0 True if unordered or less than 476 SETULE, // 1 1 0 1 True if unordered, less than, or equal 477 SETUNE, // 1 1 1 0 True if unordered or not equal 478 SETTRUE, // 1 1 1 1 Always true (always folded) 479 // Don't care operations: undefined if the input is a nan. 480 SETFALSE2, // 1 X 0 0 0 Always false (always folded) 481 SETEQ, // 1 X 0 0 1 True if equal 482 SETGT, // 1 X 0 1 0 True if greater than 483 SETGE, // 1 X 0 1 1 True if greater than or equal 484 SETLT, // 1 X 1 0 0 True if less than 485 SETLE, // 1 X 1 0 1 True if less than or equal 486 SETNE, // 1 X 1 1 0 True if not equal 487 SETTRUE2, // 1 X 1 1 1 Always true (always folded) 488 489 SETCC_INVALID // Marker value. 490 }; 491 492 /// isSignedIntSetCC - Return true if this is a setcc instruction that 493 /// performs a signed comparison when used with integer operands. 494 inline bool isSignedIntSetCC(CondCode Code) { 495 return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE; 496 } 497 498 /// isUnsignedIntSetCC - Return true if this is a setcc instruction that 499 /// performs an unsigned comparison when used with integer operands. 500 inline bool isUnsignedIntSetCC(CondCode Code) { 501 return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE; 502 } 503 504 /// isTrueWhenEqual - Return true if the specified condition returns true if 505 /// the two operands to the condition are equal. Note that if one of the two 506 /// operands is a NaN, this value is meaningless. 507 inline bool isTrueWhenEqual(CondCode Cond) { 508 return ((int)Cond & 1) != 0; 509 } 510 511 /// getUnorderedFlavor - This function returns 0 if the condition is always 512 /// false if an operand is a NaN, 1 if the condition is always true if the 513 /// operand is a NaN, and 2 if the condition is undefined if the operand is a 514 /// NaN. 515 inline unsigned getUnorderedFlavor(CondCode Cond) { 516 return ((int)Cond >> 3) & 3; 517 } 518 519 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where 520 /// 'op' is a valid SetCC operation. 521 CondCode getSetCCInverse(CondCode Operation, bool isInteger); 522 523 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 524 /// when given the operation for (X op Y). 525 CondCode getSetCCSwappedOperands(CondCode Operation); 526 527 /// getSetCCOrOperation - Return the result of a logical OR between different 528 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This 529 /// function returns SETCC_INVALID if it is not possible to represent the 530 /// resultant comparison. 531 CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger); 532 533 /// getSetCCAndOperation - Return the result of a logical AND between 534 /// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 535 /// function returns SETCC_INVALID if it is not possible to represent the 536 /// resultant comparison. 537 CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger); 538} // end llvm::ISD namespace 539 540 541//===----------------------------------------------------------------------===// 542/// SDOperand - Unlike LLVM values, Selection DAG nodes may return multiple 543/// values as the result of a computation. Many nodes return multiple values, 544/// from loads (which define a token and a return value) to ADDC (which returns 545/// a result and a carry value), to calls (which may return an arbitrary number 546/// of values). 547/// 548/// As such, each use of a SelectionDAG computation must indicate the node that 549/// computes it as well as which return value to use from that node. This pair 550/// of information is represented with the SDOperand value type. 551/// 552class SDOperand { 553public: 554 SDNode *Val; // The node defining the value we are using. 555 unsigned ResNo; // Which return value of the node we are using. 556 557 SDOperand() : Val(0) {} 558 SDOperand(SDNode *val, unsigned resno) : Val(val), ResNo(resno) {} 559 560 bool operator==(const SDOperand &O) const { 561 return Val == O.Val && ResNo == O.ResNo; 562 } 563 bool operator!=(const SDOperand &O) const { 564 return !operator==(O); 565 } 566 bool operator<(const SDOperand &O) const { 567 return Val < O.Val || (Val == O.Val && ResNo < O.ResNo); 568 } 569 570 SDOperand getValue(unsigned R) const { 571 return SDOperand(Val, R); 572 } 573 574 // isOperand - Return true if this node is an operand of N. 575 bool isOperand(SDNode *N) const; 576 577 /// getValueType - Return the ValueType of the referenced return value. 578 /// 579 inline MVT::ValueType getValueType() const; 580 581 // Forwarding methods - These forward to the corresponding methods in SDNode. 582 inline unsigned getOpcode() const; 583 inline unsigned getNodeDepth() const; 584 inline unsigned getNumOperands() const; 585 inline const SDOperand &getOperand(unsigned i) const; 586 inline bool isTargetOpcode() const; 587 inline unsigned getTargetOpcode() const; 588 589 /// hasOneUse - Return true if there is exactly one operation using this 590 /// result value of the defining operator. 591 inline bool hasOneUse() const; 592}; 593 594 595/// simplify_type specializations - Allow casting operators to work directly on 596/// SDOperands as if they were SDNode*'s. 597template<> struct simplify_type<SDOperand> { 598 typedef SDNode* SimpleType; 599 static SimpleType getSimplifiedValue(const SDOperand &Val) { 600 return static_cast<SimpleType>(Val.Val); 601 } 602}; 603template<> struct simplify_type<const SDOperand> { 604 typedef SDNode* SimpleType; 605 static SimpleType getSimplifiedValue(const SDOperand &Val) { 606 return static_cast<SimpleType>(Val.Val); 607 } 608}; 609 610 611/// SDNode - Represents one node in the SelectionDAG. 612/// 613class SDNode { 614 /// NodeType - The operation that this node performs. 615 /// 616 unsigned short NodeType; 617 618 /// NodeDepth - Node depth is defined as MAX(Node depth of children)+1. This 619 /// means that leaves have a depth of 1, things that use only leaves have a 620 /// depth of 2, etc. 621 unsigned short NodeDepth; 622 623 /// OperandList - The values that are used by this operation. 624 /// 625 SDOperand *OperandList; 626 627 /// ValueList - The types of the values this node defines. SDNode's may 628 /// define multiple values simultaneously. 629 MVT::ValueType *ValueList; 630 631 /// NumOperands/NumValues - The number of entries in the Operand/Value list. 632 unsigned short NumOperands, NumValues; 633 634 /// Prev/Next pointers - These pointers form the linked list of of the 635 /// AllNodes list in the current DAG. 636 SDNode *Prev, *Next; 637 friend struct ilist_traits<SDNode>; 638 639 /// Uses - These are all of the SDNode's that use a value produced by this 640 /// node. 641 std::vector<SDNode*> Uses; 642public: 643 virtual ~SDNode() { 644 assert(NumOperands == 0 && "Operand list not cleared before deletion"); 645 } 646 647 //===--------------------------------------------------------------------===// 648 // Accessors 649 // 650 unsigned getOpcode() const { return NodeType; } 651 bool isTargetOpcode() const { return NodeType >= ISD::BUILTIN_OP_END; } 652 unsigned getTargetOpcode() const { 653 assert(isTargetOpcode() && "Not a target opcode!"); 654 return NodeType - ISD::BUILTIN_OP_END; 655 } 656 657 size_t use_size() const { return Uses.size(); } 658 bool use_empty() const { return Uses.empty(); } 659 bool hasOneUse() const { return Uses.size() == 1; } 660 661 /// getNodeDepth - Return the distance from this node to the leaves in the 662 /// graph. The leaves have a depth of 1. 663 unsigned getNodeDepth() const { return NodeDepth; } 664 665 typedef std::vector<SDNode*>::const_iterator use_iterator; 666 use_iterator use_begin() const { return Uses.begin(); } 667 use_iterator use_end() const { return Uses.end(); } 668 669 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 670 /// indicated value. This method ignores uses of other values defined by this 671 /// operation. 672 bool hasNUsesOfValue(unsigned NUses, unsigned Value) const; 673 674 // isOnlyUse - Return true if this node is the only use of N. 675 bool isOnlyUse(SDNode *N) const; 676 677 // isOperand - Return true if this node is an operand of N. 678 bool isOperand(SDNode *N) const; 679 680 /// getNumOperands - Return the number of values used by this operation. 681 /// 682 unsigned getNumOperands() const { return NumOperands; } 683 684 const SDOperand &getOperand(unsigned Num) const { 685 assert(Num < NumOperands && "Invalid child # of SDNode!"); 686 return OperandList[Num]; 687 } 688 typedef const SDOperand* op_iterator; 689 op_iterator op_begin() const { return OperandList; } 690 op_iterator op_end() const { return OperandList+NumOperands; } 691 692 693 /// getNumValues - Return the number of values defined/returned by this 694 /// operator. 695 /// 696 unsigned getNumValues() const { return NumValues; } 697 698 /// getValueType - Return the type of a specified result. 699 /// 700 MVT::ValueType getValueType(unsigned ResNo) const { 701 assert(ResNo < NumValues && "Illegal result number!"); 702 return ValueList[ResNo]; 703 } 704 705 typedef const MVT::ValueType* value_iterator; 706 value_iterator value_begin() const { return ValueList; } 707 value_iterator value_end() const { return ValueList+NumValues; } 708 709 /// getOperationName - Return the opcode of this operation for printing. 710 /// 711 const char* getOperationName(const SelectionDAG *G = 0) const; 712 void dump() const; 713 void dump(const SelectionDAG *G) const; 714 715 static bool classof(const SDNode *) { return true; } 716 717protected: 718 friend class SelectionDAG; 719 720 /// getValueTypeList - Return a pointer to the specified value type. 721 /// 722 static MVT::ValueType *getValueTypeList(MVT::ValueType VT); 723 724 SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT), NodeDepth(1) { 725 OperandList = 0; NumOperands = 0; 726 ValueList = getValueTypeList(VT); 727 NumValues = 1; 728 Prev = 0; Next = 0; 729 } 730 SDNode(unsigned NT, SDOperand Op) 731 : NodeType(NT), NodeDepth(Op.Val->getNodeDepth()+1) { 732 OperandList = new SDOperand[1]; 733 OperandList[0] = Op; 734 NumOperands = 1; 735 Op.Val->Uses.push_back(this); 736 ValueList = 0; 737 NumValues = 0; 738 Prev = 0; Next = 0; 739 } 740 SDNode(unsigned NT, SDOperand N1, SDOperand N2) 741 : NodeType(NT) { 742 if (N1.Val->getNodeDepth() > N2.Val->getNodeDepth()) 743 NodeDepth = N1.Val->getNodeDepth()+1; 744 else 745 NodeDepth = N2.Val->getNodeDepth()+1; 746 OperandList = new SDOperand[2]; 747 OperandList[0] = N1; 748 OperandList[1] = N2; 749 NumOperands = 2; 750 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this); 751 ValueList = 0; 752 NumValues = 0; 753 Prev = 0; Next = 0; 754 } 755 SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3) 756 : NodeType(NT) { 757 unsigned ND = N1.Val->getNodeDepth(); 758 if (ND < N2.Val->getNodeDepth()) 759 ND = N2.Val->getNodeDepth(); 760 if (ND < N3.Val->getNodeDepth()) 761 ND = N3.Val->getNodeDepth(); 762 NodeDepth = ND+1; 763 764 OperandList = new SDOperand[3]; 765 OperandList[0] = N1; 766 OperandList[1] = N2; 767 OperandList[2] = N3; 768 NumOperands = 3; 769 770 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this); 771 N3.Val->Uses.push_back(this); 772 ValueList = 0; 773 NumValues = 0; 774 Prev = 0; Next = 0; 775 } 776 SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4) 777 : NodeType(NT) { 778 unsigned ND = N1.Val->getNodeDepth(); 779 if (ND < N2.Val->getNodeDepth()) 780 ND = N2.Val->getNodeDepth(); 781 if (ND < N3.Val->getNodeDepth()) 782 ND = N3.Val->getNodeDepth(); 783 if (ND < N4.Val->getNodeDepth()) 784 ND = N4.Val->getNodeDepth(); 785 NodeDepth = ND+1; 786 787 OperandList = new SDOperand[4]; 788 OperandList[0] = N1; 789 OperandList[1] = N2; 790 OperandList[2] = N3; 791 OperandList[3] = N4; 792 NumOperands = 4; 793 794 N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this); 795 N3.Val->Uses.push_back(this); N4.Val->Uses.push_back(this); 796 ValueList = 0; 797 NumValues = 0; 798 Prev = 0; Next = 0; 799 } 800 SDNode(unsigned Opc, const std::vector<SDOperand> &Nodes) : NodeType(Opc) { 801 NumOperands = Nodes.size(); 802 OperandList = new SDOperand[NumOperands]; 803 804 unsigned ND = 0; 805 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) { 806 OperandList[i] = Nodes[i]; 807 SDNode *N = OperandList[i].Val; 808 N->Uses.push_back(this); 809 if (ND < N->getNodeDepth()) ND = N->getNodeDepth(); 810 } 811 NodeDepth = ND+1; 812 ValueList = 0; 813 NumValues = 0; 814 Prev = 0; Next = 0; 815 } 816 817 /// MorphNodeTo - This clears the return value and operands list, and sets the 818 /// opcode of the node to the specified value. This should only be used by 819 /// the SelectionDAG class. 820 void MorphNodeTo(unsigned Opc) { 821 NodeType = Opc; 822 ValueList = 0; 823 NumValues = 0; 824 825 // Clear the operands list, updating used nodes to remove this from their 826 // use list. 827 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I) 828 I->Val->removeUser(this); 829 delete [] OperandList; 830 OperandList = 0; 831 NumOperands = 0; 832 } 833 834 void setValueTypes(MVT::ValueType VT) { 835 assert(NumValues == 0 && "Should not have values yet!"); 836 ValueList = getValueTypeList(VT); 837 NumValues = 1; 838 } 839 void setValueTypes(MVT::ValueType *List, unsigned NumVal) { 840 assert(NumValues == 0 && "Should not have values yet!"); 841 ValueList = List; 842 NumValues = NumVal; 843 } 844 845 void setOperands(SDOperand Op0) { 846 assert(NumOperands == 0 && "Should not have operands yet!"); 847 OperandList = new SDOperand[1]; 848 OperandList[0] = Op0; 849 NumOperands = 1; 850 Op0.Val->Uses.push_back(this); 851 } 852 void setOperands(SDOperand Op0, SDOperand Op1) { 853 assert(NumOperands == 0 && "Should not have operands yet!"); 854 OperandList = new SDOperand[2]; 855 OperandList[0] = Op0; 856 OperandList[1] = Op1; 857 NumOperands = 2; 858 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 859 } 860 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2) { 861 assert(NumOperands == 0 && "Should not have operands yet!"); 862 OperandList = new SDOperand[3]; 863 OperandList[0] = Op0; 864 OperandList[1] = Op1; 865 OperandList[2] = Op2; 866 NumOperands = 3; 867 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 868 Op2.Val->Uses.push_back(this); 869 } 870 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3) { 871 assert(NumOperands == 0 && "Should not have operands yet!"); 872 OperandList = new SDOperand[4]; 873 OperandList[0] = Op0; 874 OperandList[1] = Op1; 875 OperandList[2] = Op2; 876 OperandList[3] = Op3; 877 NumOperands = 4; 878 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 879 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this); 880 } 881 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3, 882 SDOperand Op4) { 883 assert(NumOperands == 0 && "Should not have operands yet!"); 884 OperandList = new SDOperand[5]; 885 OperandList[0] = Op0; 886 OperandList[1] = Op1; 887 OperandList[2] = Op2; 888 OperandList[3] = Op3; 889 OperandList[4] = Op4; 890 NumOperands = 5; 891 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 892 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this); 893 Op4.Val->Uses.push_back(this); 894 } 895 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3, 896 SDOperand Op4, SDOperand Op5) { 897 assert(NumOperands == 0 && "Should not have operands yet!"); 898 OperandList = new SDOperand[6]; 899 OperandList[0] = Op0; 900 OperandList[1] = Op1; 901 OperandList[2] = Op2; 902 OperandList[3] = Op3; 903 OperandList[4] = Op4; 904 OperandList[5] = Op5; 905 NumOperands = 6; 906 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 907 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this); 908 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this); 909 } 910 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3, 911 SDOperand Op4, SDOperand Op5, SDOperand Op6) { 912 assert(NumOperands == 0 && "Should not have operands yet!"); 913 OperandList = new SDOperand[7]; 914 OperandList[0] = Op0; 915 OperandList[1] = Op1; 916 OperandList[2] = Op2; 917 OperandList[3] = Op3; 918 OperandList[4] = Op4; 919 OperandList[5] = Op5; 920 OperandList[6] = Op6; 921 NumOperands = 7; 922 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 923 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this); 924 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this); 925 Op6.Val->Uses.push_back(this); 926 } 927 void setOperands(SDOperand Op0, SDOperand Op1, SDOperand Op2, SDOperand Op3, 928 SDOperand Op4, SDOperand Op5, SDOperand Op6, SDOperand Op7) { 929 assert(NumOperands == 0 && "Should not have operands yet!"); 930 OperandList = new SDOperand[8]; 931 OperandList[0] = Op0; 932 OperandList[1] = Op1; 933 OperandList[2] = Op2; 934 OperandList[3] = Op3; 935 OperandList[4] = Op4; 936 OperandList[5] = Op5; 937 OperandList[6] = Op6; 938 OperandList[7] = Op7; 939 NumOperands = 8; 940 Op0.Val->Uses.push_back(this); Op1.Val->Uses.push_back(this); 941 Op2.Val->Uses.push_back(this); Op3.Val->Uses.push_back(this); 942 Op4.Val->Uses.push_back(this); Op5.Val->Uses.push_back(this); 943 Op6.Val->Uses.push_back(this); Op7.Val->Uses.push_back(this); 944 } 945 946 void addUser(SDNode *User) { 947 Uses.push_back(User); 948 } 949 void removeUser(SDNode *User) { 950 // Remove this user from the operand's use list. 951 for (unsigned i = Uses.size(); ; --i) { 952 assert(i != 0 && "Didn't find user!"); 953 if (Uses[i-1] == User) { 954 Uses[i-1] = Uses.back(); 955 Uses.pop_back(); 956 return; 957 } 958 } 959 } 960}; 961 962 963// Define inline functions from the SDOperand class. 964 965inline unsigned SDOperand::getOpcode() const { 966 return Val->getOpcode(); 967} 968inline unsigned SDOperand::getNodeDepth() const { 969 return Val->getNodeDepth(); 970} 971inline MVT::ValueType SDOperand::getValueType() const { 972 return Val->getValueType(ResNo); 973} 974inline unsigned SDOperand::getNumOperands() const { 975 return Val->getNumOperands(); 976} 977inline const SDOperand &SDOperand::getOperand(unsigned i) const { 978 return Val->getOperand(i); 979} 980inline bool SDOperand::isTargetOpcode() const { 981 return Val->isTargetOpcode(); 982} 983inline unsigned SDOperand::getTargetOpcode() const { 984 return Val->getTargetOpcode(); 985} 986inline bool SDOperand::hasOneUse() const { 987 return Val->hasNUsesOfValue(1, ResNo); 988} 989 990/// HandleSDNode - This class is used to form a handle around another node that 991/// is persistant and is updated across invocations of replaceAllUsesWith on its 992/// operand. This node should be directly created by end-users and not added to 993/// the AllNodes list. 994class HandleSDNode : public SDNode { 995public: 996 HandleSDNode(SDOperand X) : SDNode(ISD::HANDLENODE, X) {} 997 ~HandleSDNode() { 998 MorphNodeTo(ISD::HANDLENODE); // Drops operand uses. 999 } 1000 1001 SDOperand getValue() const { return getOperand(0); } 1002}; 1003 1004class StringSDNode : public SDNode { 1005 std::string Value; 1006protected: 1007 friend class SelectionDAG; 1008 StringSDNode(const std::string &val) 1009 : SDNode(ISD::STRING, MVT::Other), Value(val) { 1010 } 1011public: 1012 const std::string &getValue() const { return Value; } 1013 static bool classof(const StringSDNode *) { return true; } 1014 static bool classof(const SDNode *N) { 1015 return N->getOpcode() == ISD::STRING; 1016 } 1017}; 1018 1019class ConstantSDNode : public SDNode { 1020 uint64_t Value; 1021protected: 1022 friend class SelectionDAG; 1023 ConstantSDNode(bool isTarget, uint64_t val, MVT::ValueType VT) 1024 : SDNode(isTarget ? ISD::TargetConstant : ISD::Constant, VT), Value(val) { 1025 } 1026public: 1027 1028 uint64_t getValue() const { return Value; } 1029 1030 int64_t getSignExtended() const { 1031 unsigned Bits = MVT::getSizeInBits(getValueType(0)); 1032 return ((int64_t)Value << (64-Bits)) >> (64-Bits); 1033 } 1034 1035 bool isNullValue() const { return Value == 0; } 1036 bool isAllOnesValue() const { 1037 int NumBits = MVT::getSizeInBits(getValueType(0)); 1038 if (NumBits == 64) return Value+1 == 0; 1039 return Value == (1ULL << NumBits)-1; 1040 } 1041 1042 static bool classof(const ConstantSDNode *) { return true; } 1043 static bool classof(const SDNode *N) { 1044 return N->getOpcode() == ISD::Constant || 1045 N->getOpcode() == ISD::TargetConstant; 1046 } 1047}; 1048 1049class ConstantFPSDNode : public SDNode { 1050 double Value; 1051protected: 1052 friend class SelectionDAG; 1053 ConstantFPSDNode(bool isTarget, double val, MVT::ValueType VT) 1054 : SDNode(isTarget ? ISD::TargetConstantFP : ISD::ConstantFP, VT), 1055 Value(val) { 1056 } 1057public: 1058 1059 double getValue() const { return Value; } 1060 1061 /// isExactlyValue - We don't rely on operator== working on double values, as 1062 /// it returns true for things that are clearly not equal, like -0.0 and 0.0. 1063 /// As such, this method can be used to do an exact bit-for-bit comparison of 1064 /// two floating point values. 1065 bool isExactlyValue(double V) const; 1066 1067 static bool classof(const ConstantFPSDNode *) { return true; } 1068 static bool classof(const SDNode *N) { 1069 return N->getOpcode() == ISD::ConstantFP || 1070 N->getOpcode() == ISD::TargetConstantFP; 1071 } 1072}; 1073 1074class GlobalAddressSDNode : public SDNode { 1075 GlobalValue *TheGlobal; 1076 int Offset; 1077protected: 1078 friend class SelectionDAG; 1079 GlobalAddressSDNode(bool isTarget, const GlobalValue *GA, MVT::ValueType VT, 1080 int o=0) 1081 : SDNode(isTarget ? ISD::TargetGlobalAddress : ISD::GlobalAddress, VT), 1082 Offset(o) { 1083 TheGlobal = const_cast<GlobalValue*>(GA); 1084 } 1085public: 1086 1087 GlobalValue *getGlobal() const { return TheGlobal; } 1088 int getOffset() const { return Offset; } 1089 1090 static bool classof(const GlobalAddressSDNode *) { return true; } 1091 static bool classof(const SDNode *N) { 1092 return N->getOpcode() == ISD::GlobalAddress || 1093 N->getOpcode() == ISD::TargetGlobalAddress; 1094 } 1095}; 1096 1097 1098class FrameIndexSDNode : public SDNode { 1099 int FI; 1100protected: 1101 friend class SelectionDAG; 1102 FrameIndexSDNode(int fi, MVT::ValueType VT, bool isTarg) 1103 : SDNode(isTarg ? ISD::TargetFrameIndex : ISD::FrameIndex, VT), FI(fi) {} 1104public: 1105 1106 int getIndex() const { return FI; } 1107 1108 static bool classof(const FrameIndexSDNode *) { return true; } 1109 static bool classof(const SDNode *N) { 1110 return N->getOpcode() == ISD::FrameIndex || 1111 N->getOpcode() == ISD::TargetFrameIndex; 1112 } 1113}; 1114 1115class ConstantPoolSDNode : public SDNode { 1116 Constant *C; 1117 int Offset; 1118 unsigned Alignment; 1119protected: 1120 friend class SelectionDAG; 1121 ConstantPoolSDNode(bool isTarget, Constant *c, MVT::ValueType VT, 1122 int o=0) 1123 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, VT), 1124 C(c), Offset(o), Alignment(0) {} 1125 ConstantPoolSDNode(bool isTarget, Constant *c, MVT::ValueType VT, int o, 1126 unsigned Align) 1127 : SDNode(isTarget ? ISD::TargetConstantPool : ISD::ConstantPool, VT), 1128 C(c), Offset(o), Alignment(Align) {} 1129public: 1130 1131 Constant *get() const { return C; } 1132 int getOffset() const { return Offset; } 1133 1134 // Return the alignment of this constant pool object, which is either 0 (for 1135 // default alignment) or log2 of the desired value. 1136 unsigned getAlignment() const { return Alignment; } 1137 1138 static bool classof(const ConstantPoolSDNode *) { return true; } 1139 static bool classof(const SDNode *N) { 1140 return N->getOpcode() == ISD::ConstantPool || 1141 N->getOpcode() == ISD::TargetConstantPool; 1142 } 1143}; 1144 1145class BasicBlockSDNode : public SDNode { 1146 MachineBasicBlock *MBB; 1147protected: 1148 friend class SelectionDAG; 1149 BasicBlockSDNode(MachineBasicBlock *mbb) 1150 : SDNode(ISD::BasicBlock, MVT::Other), MBB(mbb) {} 1151public: 1152 1153 MachineBasicBlock *getBasicBlock() const { return MBB; } 1154 1155 static bool classof(const BasicBlockSDNode *) { return true; } 1156 static bool classof(const SDNode *N) { 1157 return N->getOpcode() == ISD::BasicBlock; 1158 } 1159}; 1160 1161class SrcValueSDNode : public SDNode { 1162 const Value *V; 1163 int offset; 1164protected: 1165 friend class SelectionDAG; 1166 SrcValueSDNode(const Value* v, int o) 1167 : SDNode(ISD::SRCVALUE, MVT::Other), V(v), offset(o) {} 1168 1169public: 1170 const Value *getValue() const { return V; } 1171 int getOffset() const { return offset; } 1172 1173 static bool classof(const SrcValueSDNode *) { return true; } 1174 static bool classof(const SDNode *N) { 1175 return N->getOpcode() == ISD::SRCVALUE; 1176 } 1177}; 1178 1179 1180class RegisterSDNode : public SDNode { 1181 unsigned Reg; 1182protected: 1183 friend class SelectionDAG; 1184 RegisterSDNode(unsigned reg, MVT::ValueType VT) 1185 : SDNode(ISD::Register, VT), Reg(reg) {} 1186public: 1187 1188 unsigned getReg() const { return Reg; } 1189 1190 static bool classof(const RegisterSDNode *) { return true; } 1191 static bool classof(const SDNode *N) { 1192 return N->getOpcode() == ISD::Register; 1193 } 1194}; 1195 1196class ExternalSymbolSDNode : public SDNode { 1197 const char *Symbol; 1198protected: 1199 friend class SelectionDAG; 1200 ExternalSymbolSDNode(bool isTarget, const char *Sym, MVT::ValueType VT) 1201 : SDNode(isTarget ? ISD::TargetExternalSymbol : ISD::ExternalSymbol, VT), 1202 Symbol(Sym) { 1203 } 1204public: 1205 1206 const char *getSymbol() const { return Symbol; } 1207 1208 static bool classof(const ExternalSymbolSDNode *) { return true; } 1209 static bool classof(const SDNode *N) { 1210 return N->getOpcode() == ISD::ExternalSymbol || 1211 N->getOpcode() == ISD::TargetExternalSymbol; 1212 } 1213}; 1214 1215class CondCodeSDNode : public SDNode { 1216 ISD::CondCode Condition; 1217protected: 1218 friend class SelectionDAG; 1219 CondCodeSDNode(ISD::CondCode Cond) 1220 : SDNode(ISD::CONDCODE, MVT::Other), Condition(Cond) { 1221 } 1222public: 1223 1224 ISD::CondCode get() const { return Condition; } 1225 1226 static bool classof(const CondCodeSDNode *) { return true; } 1227 static bool classof(const SDNode *N) { 1228 return N->getOpcode() == ISD::CONDCODE; 1229 } 1230}; 1231 1232/// VTSDNode - This class is used to represent MVT::ValueType's, which are used 1233/// to parameterize some operations. 1234class VTSDNode : public SDNode { 1235 MVT::ValueType ValueType; 1236protected: 1237 friend class SelectionDAG; 1238 VTSDNode(MVT::ValueType VT) 1239 : SDNode(ISD::VALUETYPE, MVT::Other), ValueType(VT) {} 1240public: 1241 1242 MVT::ValueType getVT() const { return ValueType; } 1243 1244 static bool classof(const VTSDNode *) { return true; } 1245 static bool classof(const SDNode *N) { 1246 return N->getOpcode() == ISD::VALUETYPE; 1247 } 1248}; 1249 1250 1251class SDNodeIterator : public forward_iterator<SDNode, ptrdiff_t> { 1252 SDNode *Node; 1253 unsigned Operand; 1254 1255 SDNodeIterator(SDNode *N, unsigned Op) : Node(N), Operand(Op) {} 1256public: 1257 bool operator==(const SDNodeIterator& x) const { 1258 return Operand == x.Operand; 1259 } 1260 bool operator!=(const SDNodeIterator& x) const { return !operator==(x); } 1261 1262 const SDNodeIterator &operator=(const SDNodeIterator &I) { 1263 assert(I.Node == Node && "Cannot assign iterators to two different nodes!"); 1264 Operand = I.Operand; 1265 return *this; 1266 } 1267 1268 pointer operator*() const { 1269 return Node->getOperand(Operand).Val; 1270 } 1271 pointer operator->() const { return operator*(); } 1272 1273 SDNodeIterator& operator++() { // Preincrement 1274 ++Operand; 1275 return *this; 1276 } 1277 SDNodeIterator operator++(int) { // Postincrement 1278 SDNodeIterator tmp = *this; ++*this; return tmp; 1279 } 1280 1281 static SDNodeIterator begin(SDNode *N) { return SDNodeIterator(N, 0); } 1282 static SDNodeIterator end (SDNode *N) { 1283 return SDNodeIterator(N, N->getNumOperands()); 1284 } 1285 1286 unsigned getOperand() const { return Operand; } 1287 const SDNode *getNode() const { return Node; } 1288}; 1289 1290template <> struct GraphTraits<SDNode*> { 1291 typedef SDNode NodeType; 1292 typedef SDNodeIterator ChildIteratorType; 1293 static inline NodeType *getEntryNode(SDNode *N) { return N; } 1294 static inline ChildIteratorType child_begin(NodeType *N) { 1295 return SDNodeIterator::begin(N); 1296 } 1297 static inline ChildIteratorType child_end(NodeType *N) { 1298 return SDNodeIterator::end(N); 1299 } 1300}; 1301 1302template<> 1303struct ilist_traits<SDNode> { 1304 static SDNode *getPrev(const SDNode *N) { return N->Prev; } 1305 static SDNode *getNext(const SDNode *N) { return N->Next; } 1306 1307 static void setPrev(SDNode *N, SDNode *Prev) { N->Prev = Prev; } 1308 static void setNext(SDNode *N, SDNode *Next) { N->Next = Next; } 1309 1310 static SDNode *createSentinel() { 1311 return new SDNode(ISD::EntryToken, MVT::Other); 1312 } 1313 static void destroySentinel(SDNode *N) { delete N; } 1314 //static SDNode *createNode(const SDNode &V) { return new SDNode(V); } 1315 1316 1317 void addNodeToList(SDNode *NTy) {} 1318 void removeNodeFromList(SDNode *NTy) {} 1319 void transferNodesFromList(iplist<SDNode, ilist_traits> &L2, 1320 const ilist_iterator<SDNode> &X, 1321 const ilist_iterator<SDNode> &Y) {} 1322}; 1323 1324} // end llvm namespace 1325 1326#endif 1327