TinyPtrVector.h revision 22e522e08640be459f237796009cf7666d6d75e7
19d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner//===- llvm/ADT/TinyPtrVector.h - 'Normally tiny' vectors -------*- C++ -*-===// 29d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// 39d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// The LLVM Compiler Infrastructure 49d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// 59d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// This file is distributed under the University of Illinois Open Source 69d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// License. See LICENSE.TXT for details. 79d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner// 89d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner//===----------------------------------------------------------------------===// 99d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 109d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner#ifndef LLVM_ADT_TINYPTRVECTOR_H 119d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner#define LLVM_ADT_TINYPTRVECTOR_H 129d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 139d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner#include "llvm/ADT/SmallVector.h" 149d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner#include "llvm/ADT/PointerUnion.h" 159d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 169d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattnernamespace llvm { 179d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 189d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// TinyPtrVector - This class is specialized for cases where there are 199d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// normally 0 or 1 element in a vector, but is general enough to go beyond that 209d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// when required. 219d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// 229d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// NOTE: This container doesn't allow you to store a null pointer into it. 239d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner/// 249d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattnertemplate <typename EltTy> 259d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattnerclass TinyPtrVector { 269d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattnerpublic: 279d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner typedef llvm::SmallVector<EltTy, 4> VecTy; 289d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner llvm::PointerUnion<EltTy, VecTy*> Val; 299d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 309d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner TinyPtrVector() {} 319d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner TinyPtrVector(const TinyPtrVector &RHS) : Val(RHS.Val) { 329d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (VecTy *V = Val.template dyn_cast<VecTy*>()) 339d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val = new VecTy(*V); 349d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 359d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner ~TinyPtrVector() { 369d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (VecTy *V = Val.template dyn_cast<VecTy*>()) 379d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner delete V; 389d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 399d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 409d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner bool empty() const { 4122e522e08640be459f237796009cf7666d6d75e7Chris Lattner // This vector can be empty if it contains no element, or if it 4222e522e08640be459f237796009cf7666d6d75e7Chris Lattner // contains a pointer to an empty vector. 439d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (Val.isNull()) return true; 449d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (VecTy *Vec = Val.template dyn_cast<VecTy*>()) 459d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return Vec->empty(); 469d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return false; 479d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 489d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 499d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner unsigned size() const { 509d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (empty()) 519d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return 0; 5222e522e08640be459f237796009cf7666d6d75e7Chris Lattner if (Val.template is<EltTy>()) 539d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return 1; 5422e522e08640be459f237796009cf7666d6d75e7Chris Lattner return Val.template get<VecTy*>()->size(); 559d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 569d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 5779976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner typedef const EltTy *iterator; 5879976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner iterator begin() const { 5979976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner if (empty()) 6079976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return 0; 6179976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 6279976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner if (Val.template is<EltTy>()) 6379976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return Val.template getAddrOf<EltTy>(); 6479976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 6579976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return Val.template get<VecTy *>()->begin(); 6679976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 6779976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner } 6879976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner iterator end() const { 6979976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner if (empty()) 7079976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return 0; 7179976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 7279976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner if (Val.template is<EltTy>()) 7379976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return begin() + 1; 7479976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 7579976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner return Val.template get<VecTy *>()->end(); 7679976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner } 7779976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 7879976a40728c8baa8cd16de90173fe2c48937e22Chris Lattner 799d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner EltTy operator[](unsigned i) const { 809d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner assert(!Val.isNull() && "can't index into an empty vector"); 819d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (EltTy V = Val.template dyn_cast<EltTy>()) { 829d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner assert(i == 0 && "tinyvector index out of range"); 839d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return V; 849d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 859d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 8622e522e08640be459f237796009cf7666d6d75e7Chris Lattner assert(i < Val.template get<VecTy*>()->size() && 879d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner "tinyvector index out of range"); 8822e522e08640be459f237796009cf7666d6d75e7Chris Lattner return (*Val.template get<VecTy*>())[i]; 899d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 909d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 919d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner EltTy front() const { 929d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner assert(!empty() && "vector empty"); 939d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (EltTy V = Val.template dyn_cast<EltTy>()) 949d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return V; 959d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return Val.template get<VecTy*>()->front(); 969d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 979d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 989d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner void push_back(EltTy NewVal) { 999d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner assert(NewVal != 0 && "Can't add a null value"); 1009d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1019d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // If we have nothing, add something. 1029d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner if (Val.isNull()) { 1039d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val = NewVal; 1049d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner return; 1059d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 1069d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1079d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // If we have a single value, convert to a vector. 10822e522e08640be459f237796009cf7666d6d75e7Chris Lattner if (EltTy V = Val.template dyn_cast<EltTy>()) { 1099d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val = new VecTy(); 1109d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val.template get<VecTy*>()->push_back(V); 1119d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 1129d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1139d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // Add the new value, we know we have a vector. 1149d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val.template get<VecTy*>()->push_back(NewVal); 1159d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 1169d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1179d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner void clear() { 1189d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // If we have a single value, convert to empty. 119840635741f132a9a10f052cbf3b21e14bc74835aChris Lattner if (Val.template is<EltTy>()) { 1209d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Val = (EltTy)0; 1219d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } else if (VecTy *Vec = Val.template dyn_cast<VecTy*>()) { 1229d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // If we have a vector form, just clear it. 1239d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner Vec->clear(); 1249d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 1259d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner // Otherwise, we're already empty. 1269d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner } 1279d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1289d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattnerprivate: 1299d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner void operator=(const TinyPtrVector&); // NOT IMPLEMENTED YET. 1309d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner}; 1319d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner} // end namespace llvm 1329d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner 1339d69d4aadd4a58aba5634d5c3d2c2a6d8d284134Chris Lattner#endif 134