| File: | llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp |
| Warning: | line 2162, column 9 Value stored to 'MBBJoined' is never read |
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| 1 | //===- VarLocBasedImpl.cpp - Tracking Debug Value MIs with VarLoc class----===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | /// |
| 9 | /// \file VarLocBasedImpl.cpp |
| 10 | /// |
| 11 | /// LiveDebugValues is an optimistic "available expressions" dataflow |
| 12 | /// algorithm. The set of expressions is the set of machine locations |
| 13 | /// (registers, spill slots, constants) that a variable fragment might be |
| 14 | /// located, qualified by a DIExpression and indirect-ness flag, while each |
| 15 | /// variable is identified by a DebugVariable object. The availability of an |
| 16 | /// expression begins when a DBG_VALUE instruction specifies the location of a |
| 17 | /// DebugVariable, and continues until that location is clobbered or |
| 18 | /// re-specified by a different DBG_VALUE for the same DebugVariable. |
| 19 | /// |
| 20 | /// The output of LiveDebugValues is additional DBG_VALUE instructions, |
| 21 | /// placed to extend variable locations as far they're available. This file |
| 22 | /// and the VarLocBasedLDV class is an implementation that explicitly tracks |
| 23 | /// locations, using the VarLoc class. |
| 24 | /// |
| 25 | /// The canonical "available expressions" problem doesn't have expression |
| 26 | /// clobbering, instead when a variable is re-assigned, any expressions using |
| 27 | /// that variable get invalidated. LiveDebugValues can map onto "available |
| 28 | /// expressions" by having every register represented by a variable, which is |
| 29 | /// used in an expression that becomes available at a DBG_VALUE instruction. |
| 30 | /// When the register is clobbered, its variable is effectively reassigned, and |
| 31 | /// expressions computed from it become unavailable. A similar construct is |
| 32 | /// needed when a DebugVariable has its location re-specified, to invalidate |
| 33 | /// all other locations for that DebugVariable. |
| 34 | /// |
| 35 | /// Using the dataflow analysis to compute the available expressions, we create |
| 36 | /// a DBG_VALUE at the beginning of each block where the expression is |
| 37 | /// live-in. This propagates variable locations into every basic block where |
| 38 | /// the location can be determined, rather than only having DBG_VALUEs in blocks |
| 39 | /// where locations are specified due to an assignment or some optimization. |
| 40 | /// Movements of values between registers and spill slots are annotated with |
| 41 | /// DBG_VALUEs too to track variable values bewteen locations. All this allows |
| 42 | /// DbgEntityHistoryCalculator to focus on only the locations within individual |
| 43 | /// blocks, facilitating testing and improving modularity. |
| 44 | /// |
| 45 | /// We follow an optimisic dataflow approach, with this lattice: |
| 46 | /// |
| 47 | /// \verbatim |
| 48 | /// ┬ "Unknown" |
| 49 | /// | |
| 50 | /// v |
| 51 | /// True |
| 52 | /// | |
| 53 | /// v |
| 54 | /// ⊥ False |
| 55 | /// \endverbatim With "True" signifying that the expression is available (and |
| 56 | /// thus a DebugVariable's location is the corresponding register), while |
| 57 | /// "False" signifies that the expression is unavailable. "Unknown"s never |
| 58 | /// survive to the end of the analysis (see below). |
| 59 | /// |
| 60 | /// Formally, all DebugVariable locations that are live-out of a block are |
| 61 | /// initialized to \top. A blocks live-in values take the meet of the lattice |
| 62 | /// value for every predecessors live-outs, except for the entry block, where |
| 63 | /// all live-ins are \bot. The usual dataflow propagation occurs: the transfer |
| 64 | /// function for a block assigns an expression for a DebugVariable to be "True" |
| 65 | /// if a DBG_VALUE in the block specifies it; "False" if the location is |
| 66 | /// clobbered; or the live-in value if it is unaffected by the block. We |
| 67 | /// visit each block in reverse post order until a fixedpoint is reached. The |
| 68 | /// solution produced is maximal. |
| 69 | /// |
| 70 | /// Intuitively, we start by assuming that every expression / variable location |
| 71 | /// is at least "True", and then propagate "False" from the entry block and any |
| 72 | /// clobbers until there are no more changes to make. This gives us an accurate |
| 73 | /// solution because all incorrect locations will have a "False" propagated into |
| 74 | /// them. It also gives us a solution that copes well with loops by assuming |
| 75 | /// that variable locations are live-through every loop, and then removing those |
| 76 | /// that are not through dataflow. |
| 77 | /// |
| 78 | /// Within LiveDebugValues: each variable location is represented by a |
| 79 | /// VarLoc object that identifies the source variable, the set of |
| 80 | /// machine-locations that currently describe it (a single location for |
| 81 | /// DBG_VALUE or multiple for DBG_VALUE_LIST), and the DBG_VALUE inst that |
| 82 | /// specifies the location. Each VarLoc is indexed in the (function-scope) \p |
| 83 | /// VarLocMap, giving each VarLoc a set of unique indexes, each of which |
| 84 | /// corresponds to one of the VarLoc's machine-locations and can be used to |
| 85 | /// lookup the VarLoc in the VarLocMap. Rather than operate directly on machine |
| 86 | /// locations, the dataflow analysis in this pass identifies locations by their |
| 87 | /// indices in the VarLocMap, meaning all the variable locations in a block can |
| 88 | /// be described by a sparse vector of VarLocMap indicies. |
| 89 | /// |
| 90 | /// All the storage for the dataflow analysis is local to the ExtendRanges |
| 91 | /// method and passed down to helper methods. "OutLocs" and "InLocs" record the |
| 92 | /// in and out lattice values for each block. "OpenRanges" maintains a list of |
| 93 | /// variable locations and, with the "process" method, evaluates the transfer |
| 94 | /// function of each block. "flushPendingLocs" installs debug value instructions |
| 95 | /// for each live-in location at the start of blocks, while "Transfers" records |
| 96 | /// transfers of values between machine-locations. |
| 97 | /// |
| 98 | /// We avoid explicitly representing the "Unknown" (\top) lattice value in the |
| 99 | /// implementation. Instead, unvisited blocks implicitly have all lattice |
| 100 | /// values set as "Unknown". After being visited, there will be path back to |
| 101 | /// the entry block where the lattice value is "False", and as the transfer |
| 102 | /// function cannot make new "Unknown" locations, there are no scenarios where |
| 103 | /// a block can have an "Unknown" location after being visited. Similarly, we |
| 104 | /// don't enumerate all possible variable locations before exploring the |
| 105 | /// function: when a new location is discovered, all blocks previously explored |
| 106 | /// were implicitly "False" but unrecorded, and become explicitly "False" when |
| 107 | /// a new VarLoc is created with its bit not set in predecessor InLocs or |
| 108 | /// OutLocs. |
| 109 | /// |
| 110 | //===----------------------------------------------------------------------===// |
| 111 | |
| 112 | #include "LiveDebugValues.h" |
| 113 | |
| 114 | #include "llvm/ADT/CoalescingBitVector.h" |
| 115 | #include "llvm/ADT/DenseMap.h" |
| 116 | #include "llvm/ADT/PostOrderIterator.h" |
| 117 | #include "llvm/ADT/SmallPtrSet.h" |
| 118 | #include "llvm/ADT/SmallSet.h" |
| 119 | #include "llvm/ADT/SmallVector.h" |
| 120 | #include "llvm/ADT/Statistic.h" |
| 121 | #include "llvm/ADT/UniqueVector.h" |
| 122 | #include "llvm/CodeGen/LexicalScopes.h" |
| 123 | #include "llvm/CodeGen/MachineBasicBlock.h" |
| 124 | #include "llvm/CodeGen/MachineFrameInfo.h" |
| 125 | #include "llvm/CodeGen/MachineFunction.h" |
| 126 | #include "llvm/CodeGen/MachineFunctionPass.h" |
| 127 | #include "llvm/CodeGen/MachineInstr.h" |
| 128 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
| 129 | #include "llvm/CodeGen/MachineMemOperand.h" |
| 130 | #include "llvm/CodeGen/MachineOperand.h" |
| 131 | #include "llvm/CodeGen/PseudoSourceValue.h" |
| 132 | #include "llvm/CodeGen/RegisterScavenging.h" |
| 133 | #include "llvm/CodeGen/TargetFrameLowering.h" |
| 134 | #include "llvm/CodeGen/TargetInstrInfo.h" |
| 135 | #include "llvm/CodeGen/TargetLowering.h" |
| 136 | #include "llvm/CodeGen/TargetPassConfig.h" |
| 137 | #include "llvm/CodeGen/TargetRegisterInfo.h" |
| 138 | #include "llvm/CodeGen/TargetSubtargetInfo.h" |
| 139 | #include "llvm/Config/llvm-config.h" |
| 140 | #include "llvm/IR/DIBuilder.h" |
| 141 | #include "llvm/IR/DebugInfoMetadata.h" |
| 142 | #include "llvm/IR/DebugLoc.h" |
| 143 | #include "llvm/IR/Function.h" |
| 144 | #include "llvm/IR/Module.h" |
| 145 | #include "llvm/InitializePasses.h" |
| 146 | #include "llvm/MC/MCRegisterInfo.h" |
| 147 | #include "llvm/Pass.h" |
| 148 | #include "llvm/Support/Casting.h" |
| 149 | #include "llvm/Support/Compiler.h" |
| 150 | #include "llvm/Support/Debug.h" |
| 151 | #include "llvm/Support/TypeSize.h" |
| 152 | #include "llvm/Support/raw_ostream.h" |
| 153 | #include "llvm/Target/TargetMachine.h" |
| 154 | #include <algorithm> |
| 155 | #include <cassert> |
| 156 | #include <cstdint> |
| 157 | #include <functional> |
| 158 | #include <queue> |
| 159 | #include <tuple> |
| 160 | #include <utility> |
| 161 | #include <vector> |
| 162 | |
| 163 | using namespace llvm; |
| 164 | |
| 165 | #define DEBUG_TYPE"livedebugvalues" "livedebugvalues" |
| 166 | |
| 167 | STATISTIC(NumInserted, "Number of DBG_VALUE instructions inserted")static llvm::Statistic NumInserted = {"livedebugvalues", "NumInserted" , "Number of DBG_VALUE instructions inserted"}; |
| 168 | |
| 169 | /// If \p Op is a stack or frame register return true, otherwise return false. |
| 170 | /// This is used to avoid basing the debug entry values on the registers, since |
| 171 | /// we do not support it at the moment. |
| 172 | static bool isRegOtherThanSPAndFP(const MachineOperand &Op, |
| 173 | const MachineInstr &MI, |
| 174 | const TargetRegisterInfo *TRI) { |
| 175 | if (!Op.isReg()) |
| 176 | return false; |
| 177 | |
| 178 | const MachineFunction *MF = MI.getParent()->getParent(); |
| 179 | const TargetLowering *TLI = MF->getSubtarget().getTargetLowering(); |
| 180 | Register SP = TLI->getStackPointerRegisterToSaveRestore(); |
| 181 | Register FP = TRI->getFrameRegister(*MF); |
| 182 | Register Reg = Op.getReg(); |
| 183 | |
| 184 | return Reg && Reg != SP && Reg != FP; |
| 185 | } |
| 186 | |
| 187 | namespace { |
| 188 | |
| 189 | // Max out the number of statically allocated elements in DefinedRegsSet, as |
| 190 | // this prevents fallback to std::set::count() operations. |
| 191 | using DefinedRegsSet = SmallSet<Register, 32>; |
| 192 | |
| 193 | // The IDs in this set correspond to MachineLocs in VarLocs, as well as VarLocs |
| 194 | // that represent Entry Values; every VarLoc in the set will also appear |
| 195 | // exactly once at Location=0. |
| 196 | // As a result, each VarLoc may appear more than once in this "set", but each |
| 197 | // range corresponding to a Reg, SpillLoc, or EntryValue type will still be a |
| 198 | // "true" set (i.e. each VarLoc may appear only once), and the range Location=0 |
| 199 | // is the set of all VarLocs. |
| 200 | using VarLocSet = CoalescingBitVector<uint64_t>; |
| 201 | |
| 202 | /// A type-checked pair of {Register Location (or 0), Index}, used to index |
| 203 | /// into a \ref VarLocMap. This can be efficiently converted to a 64-bit int |
| 204 | /// for insertion into a \ref VarLocSet, and efficiently converted back. The |
| 205 | /// type-checker helps ensure that the conversions aren't lossy. |
| 206 | /// |
| 207 | /// Why encode a location /into/ the VarLocMap index? This makes it possible |
| 208 | /// to find the open VarLocs killed by a register def very quickly. This is a |
| 209 | /// performance-critical operation for LiveDebugValues. |
| 210 | struct LocIndex { |
| 211 | using u32_location_t = uint32_t; |
| 212 | using u32_index_t = uint32_t; |
| 213 | |
| 214 | u32_location_t Location; // Physical registers live in the range [1;2^30) (see |
| 215 | // \ref MCRegister), so we have plenty of range left |
| 216 | // here to encode non-register locations. |
| 217 | u32_index_t Index; |
| 218 | |
| 219 | /// The location that has an entry for every VarLoc in the map. |
| 220 | static constexpr u32_location_t kUniversalLocation = 0; |
| 221 | |
| 222 | /// The first location that is reserved for VarLocs with locations of kind |
| 223 | /// RegisterKind. |
| 224 | static constexpr u32_location_t kFirstRegLocation = 1; |
| 225 | |
| 226 | /// The first location greater than 0 that is not reserved for VarLocs with |
| 227 | /// locations of kind RegisterKind. |
| 228 | static constexpr u32_location_t kFirstInvalidRegLocation = 1 << 30; |
| 229 | |
| 230 | /// A special location reserved for VarLocs with locations of kind |
| 231 | /// SpillLocKind. |
| 232 | static constexpr u32_location_t kSpillLocation = kFirstInvalidRegLocation; |
| 233 | |
| 234 | /// A special location reserved for VarLocs of kind EntryValueBackupKind and |
| 235 | /// EntryValueCopyBackupKind. |
| 236 | static constexpr u32_location_t kEntryValueBackupLocation = |
| 237 | kFirstInvalidRegLocation + 1; |
| 238 | |
| 239 | LocIndex(u32_location_t Location, u32_index_t Index) |
| 240 | : Location(Location), Index(Index) {} |
| 241 | |
| 242 | uint64_t getAsRawInteger() const { |
| 243 | return (static_cast<uint64_t>(Location) << 32) | Index; |
| 244 | } |
| 245 | |
| 246 | template<typename IntT> static LocIndex fromRawInteger(IntT ID) { |
| 247 | static_assert(std::is_unsigned<IntT>::value && |
| 248 | sizeof(ID) == sizeof(uint64_t), |
| 249 | "Cannot convert raw integer to LocIndex"); |
| 250 | return {static_cast<u32_location_t>(ID >> 32), |
| 251 | static_cast<u32_index_t>(ID)}; |
| 252 | } |
| 253 | |
| 254 | /// Get the start of the interval reserved for VarLocs of kind RegisterKind |
| 255 | /// which reside in \p Reg. The end is at rawIndexForReg(Reg+1)-1. |
| 256 | static uint64_t rawIndexForReg(Register Reg) { |
| 257 | return LocIndex(Reg, 0).getAsRawInteger(); |
| 258 | } |
| 259 | |
| 260 | /// Return a range covering all set indices in the interval reserved for |
| 261 | /// \p Location in \p Set. |
| 262 | static auto indexRangeForLocation(const VarLocSet &Set, |
| 263 | u32_location_t Location) { |
| 264 | uint64_t Start = LocIndex(Location, 0).getAsRawInteger(); |
| 265 | uint64_t End = LocIndex(Location + 1, 0).getAsRawInteger(); |
| 266 | return Set.half_open_range(Start, End); |
| 267 | } |
| 268 | }; |
| 269 | |
| 270 | // Simple Set for storing all the VarLoc Indices at a Location bucket. |
| 271 | using VarLocsInRange = SmallSet<LocIndex::u32_index_t, 32>; |
| 272 | // Vector of all `LocIndex`s for a given VarLoc; the same Location should not |
| 273 | // appear in any two of these, as each VarLoc appears at most once in any |
| 274 | // Location bucket. |
| 275 | using LocIndices = SmallVector<LocIndex, 2>; |
| 276 | |
| 277 | class VarLocBasedLDV : public LDVImpl { |
| 278 | private: |
| 279 | const TargetRegisterInfo *TRI; |
| 280 | const TargetInstrInfo *TII; |
| 281 | const TargetFrameLowering *TFI; |
| 282 | TargetPassConfig *TPC; |
| 283 | BitVector CalleeSavedRegs; |
| 284 | LexicalScopes LS; |
| 285 | VarLocSet::Allocator Alloc; |
| 286 | |
| 287 | enum struct TransferKind { TransferCopy, TransferSpill, TransferRestore }; |
| 288 | |
| 289 | using FragmentInfo = DIExpression::FragmentInfo; |
| 290 | using OptFragmentInfo = Optional<DIExpression::FragmentInfo>; |
| 291 | |
| 292 | /// A pair of debug variable and value location. |
| 293 | struct VarLoc { |
| 294 | // The location at which a spilled variable resides. It consists of a |
| 295 | // register and an offset. |
| 296 | struct SpillLoc { |
| 297 | unsigned SpillBase; |
| 298 | StackOffset SpillOffset; |
| 299 | bool operator==(const SpillLoc &Other) const { |
| 300 | return SpillBase == Other.SpillBase && SpillOffset == Other.SpillOffset; |
| 301 | } |
| 302 | bool operator!=(const SpillLoc &Other) const { |
| 303 | return !(*this == Other); |
| 304 | } |
| 305 | }; |
| 306 | |
| 307 | /// Identity of the variable at this location. |
| 308 | const DebugVariable Var; |
| 309 | |
| 310 | /// The expression applied to this location. |
| 311 | const DIExpression *Expr; |
| 312 | |
| 313 | /// DBG_VALUE to clone var/expr information from if this location |
| 314 | /// is moved. |
| 315 | const MachineInstr &MI; |
| 316 | |
| 317 | enum class MachineLocKind { |
| 318 | InvalidKind = 0, |
| 319 | RegisterKind, |
| 320 | SpillLocKind, |
| 321 | ImmediateKind |
| 322 | }; |
| 323 | |
| 324 | enum class EntryValueLocKind { |
| 325 | NonEntryValueKind = 0, |
| 326 | EntryValueKind, |
| 327 | EntryValueBackupKind, |
| 328 | EntryValueCopyBackupKind |
| 329 | } EVKind; |
| 330 | |
| 331 | /// The value location. Stored separately to avoid repeatedly |
| 332 | /// extracting it from MI. |
| 333 | union MachineLocValue { |
| 334 | uint64_t RegNo; |
| 335 | SpillLoc SpillLocation; |
| 336 | uint64_t Hash; |
| 337 | int64_t Immediate; |
| 338 | const ConstantFP *FPImm; |
| 339 | const ConstantInt *CImm; |
| 340 | MachineLocValue() : Hash(0) {} |
| 341 | }; |
| 342 | |
| 343 | /// A single machine location; its Kind is either a register, spill |
| 344 | /// location, or immediate value. |
| 345 | /// If the VarLoc is not a NonEntryValueKind, then it will use only a |
| 346 | /// single MachineLoc of RegisterKind. |
| 347 | struct MachineLoc { |
| 348 | MachineLocKind Kind; |
| 349 | MachineLocValue Value; |
| 350 | bool operator==(const MachineLoc &Other) const { |
| 351 | if (Kind != Other.Kind) |
| 352 | return false; |
| 353 | switch (Kind) { |
| 354 | case MachineLocKind::SpillLocKind: |
| 355 | return Value.SpillLocation == Other.Value.SpillLocation; |
| 356 | case MachineLocKind::RegisterKind: |
| 357 | case MachineLocKind::ImmediateKind: |
| 358 | return Value.Hash == Other.Value.Hash; |
| 359 | default: |
| 360 | llvm_unreachable("Invalid kind")::llvm::llvm_unreachable_internal("Invalid kind", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 360); |
| 361 | } |
| 362 | } |
| 363 | bool operator<(const MachineLoc &Other) const { |
| 364 | switch (Kind) { |
| 365 | case MachineLocKind::SpillLocKind: |
| 366 | return std::make_tuple( |
| 367 | Kind, Value.SpillLocation.SpillBase, |
| 368 | Value.SpillLocation.SpillOffset.getFixed(), |
| 369 | Value.SpillLocation.SpillOffset.getScalable()) < |
| 370 | std::make_tuple( |
| 371 | Other.Kind, Other.Value.SpillLocation.SpillBase, |
| 372 | Other.Value.SpillLocation.SpillOffset.getFixed(), |
| 373 | Other.Value.SpillLocation.SpillOffset.getScalable()); |
| 374 | case MachineLocKind::RegisterKind: |
| 375 | case MachineLocKind::ImmediateKind: |
| 376 | return std::tie(Kind, Value.Hash) < |
| 377 | std::tie(Other.Kind, Other.Value.Hash); |
| 378 | default: |
| 379 | llvm_unreachable("Invalid kind")::llvm::llvm_unreachable_internal("Invalid kind", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 379); |
| 380 | } |
| 381 | } |
| 382 | }; |
| 383 | |
| 384 | /// The set of machine locations used to determine the variable's value, in |
| 385 | /// conjunction with Expr. Initially populated with MI's debug operands, |
| 386 | /// but may be transformed independently afterwards. |
| 387 | SmallVector<MachineLoc, 8> Locs; |
| 388 | /// Used to map the index of each location in Locs back to the index of its |
| 389 | /// original debug operand in MI. Used when multiple location operands are |
| 390 | /// coalesced and the original MI's operands need to be accessed while |
| 391 | /// emitting a debug value. |
| 392 | SmallVector<unsigned, 8> OrigLocMap; |
| 393 | |
| 394 | VarLoc(const MachineInstr &MI, LexicalScopes &LS) |
| 395 | : Var(MI.getDebugVariable(), MI.getDebugExpression(), |
| 396 | MI.getDebugLoc()->getInlinedAt()), |
| 397 | Expr(MI.getDebugExpression()), MI(MI), |
| 398 | EVKind(EntryValueLocKind::NonEntryValueKind) { |
| 399 | assert(MI.isDebugValue() && "not a DBG_VALUE")(static_cast <bool> (MI.isDebugValue() && "not a DBG_VALUE" ) ? void (0) : __assert_fail ("MI.isDebugValue() && \"not a DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 399, __extension__ __PRETTY_FUNCTION__)); |
| 400 | assert((MI.isDebugValueList() || MI.getNumOperands() == 4) &&(static_cast <bool> ((MI.isDebugValueList() || MI.getNumOperands () == 4) && "malformed DBG_VALUE") ? void (0) : __assert_fail ("(MI.isDebugValueList() || MI.getNumOperands() == 4) && \"malformed DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 401, __extension__ __PRETTY_FUNCTION__)) |
| 401 | "malformed DBG_VALUE")(static_cast <bool> ((MI.isDebugValueList() || MI.getNumOperands () == 4) && "malformed DBG_VALUE") ? void (0) : __assert_fail ("(MI.isDebugValueList() || MI.getNumOperands() == 4) && \"malformed DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 401, __extension__ __PRETTY_FUNCTION__)); |
| 402 | for (const MachineOperand &Op : MI.debug_operands()) { |
| 403 | MachineLoc ML = GetLocForOp(Op); |
| 404 | auto It = find(Locs, ML); |
| 405 | if (It == Locs.end()) { |
| 406 | Locs.push_back(ML); |
| 407 | OrigLocMap.push_back(MI.getDebugOperandIndex(&Op)); |
| 408 | } else { |
| 409 | // ML duplicates an element in Locs; replace references to Op |
| 410 | // with references to the duplicating element. |
| 411 | unsigned OpIdx = Locs.size(); |
| 412 | unsigned DuplicatingIdx = std::distance(Locs.begin(), It); |
| 413 | Expr = DIExpression::replaceArg(Expr, OpIdx, DuplicatingIdx); |
| 414 | } |
| 415 | } |
| 416 | |
| 417 | // We create the debug entry values from the factory functions rather |
| 418 | // than from this ctor. |
| 419 | assert(EVKind != EntryValueLocKind::EntryValueKind &&(static_cast <bool> (EVKind != EntryValueLocKind::EntryValueKind && !isEntryBackupLoc()) ? void (0) : __assert_fail ( "EVKind != EntryValueLocKind::EntryValueKind && !isEntryBackupLoc()" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 420, __extension__ __PRETTY_FUNCTION__)) |
| 420 | !isEntryBackupLoc())(static_cast <bool> (EVKind != EntryValueLocKind::EntryValueKind && !isEntryBackupLoc()) ? void (0) : __assert_fail ( "EVKind != EntryValueLocKind::EntryValueKind && !isEntryBackupLoc()" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 420, __extension__ __PRETTY_FUNCTION__)); |
| 421 | } |
| 422 | |
| 423 | static MachineLoc GetLocForOp(const MachineOperand &Op) { |
| 424 | MachineLocKind Kind; |
| 425 | MachineLocValue Loc; |
| 426 | if (Op.isReg()) { |
| 427 | Kind = MachineLocKind::RegisterKind; |
| 428 | Loc.RegNo = Op.getReg(); |
| 429 | } else if (Op.isImm()) { |
| 430 | Kind = MachineLocKind::ImmediateKind; |
| 431 | Loc.Immediate = Op.getImm(); |
| 432 | } else if (Op.isFPImm()) { |
| 433 | Kind = MachineLocKind::ImmediateKind; |
| 434 | Loc.FPImm = Op.getFPImm(); |
| 435 | } else if (Op.isCImm()) { |
| 436 | Kind = MachineLocKind::ImmediateKind; |
| 437 | Loc.CImm = Op.getCImm(); |
| 438 | } else |
| 439 | llvm_unreachable("Invalid Op kind for MachineLoc.")::llvm::llvm_unreachable_internal("Invalid Op kind for MachineLoc." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 439); |
| 440 | return {Kind, Loc}; |
| 441 | } |
| 442 | |
| 443 | /// Take the variable and machine-location in DBG_VALUE MI, and build an |
| 444 | /// entry location using the given expression. |
| 445 | static VarLoc CreateEntryLoc(const MachineInstr &MI, LexicalScopes &LS, |
| 446 | const DIExpression *EntryExpr, Register Reg) { |
| 447 | VarLoc VL(MI, LS); |
| 448 | assert(VL.Locs.size() == 1 &&(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 449, __extension__ __PRETTY_FUNCTION__)) |
| 449 | VL.Locs[0].Kind == MachineLocKind::RegisterKind)(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 449, __extension__ __PRETTY_FUNCTION__)); |
| 450 | VL.EVKind = EntryValueLocKind::EntryValueKind; |
| 451 | VL.Expr = EntryExpr; |
| 452 | VL.Locs[0].Value.RegNo = Reg; |
| 453 | return VL; |
| 454 | } |
| 455 | |
| 456 | /// Take the variable and machine-location from the DBG_VALUE (from the |
| 457 | /// function entry), and build an entry value backup location. The backup |
| 458 | /// location will turn into the normal location if the backup is valid at |
| 459 | /// the time of the primary location clobbering. |
| 460 | static VarLoc CreateEntryBackupLoc(const MachineInstr &MI, |
| 461 | LexicalScopes &LS, |
| 462 | const DIExpression *EntryExpr) { |
| 463 | VarLoc VL(MI, LS); |
| 464 | assert(VL.Locs.size() == 1 &&(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 465, __extension__ __PRETTY_FUNCTION__)) |
| 465 | VL.Locs[0].Kind == MachineLocKind::RegisterKind)(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 465, __extension__ __PRETTY_FUNCTION__)); |
| 466 | VL.EVKind = EntryValueLocKind::EntryValueBackupKind; |
| 467 | VL.Expr = EntryExpr; |
| 468 | return VL; |
| 469 | } |
| 470 | |
| 471 | /// Take the variable and machine-location from the DBG_VALUE (from the |
| 472 | /// function entry), and build a copy of an entry value backup location by |
| 473 | /// setting the register location to NewReg. |
| 474 | static VarLoc CreateEntryCopyBackupLoc(const MachineInstr &MI, |
| 475 | LexicalScopes &LS, |
| 476 | const DIExpression *EntryExpr, |
| 477 | Register NewReg) { |
| 478 | VarLoc VL(MI, LS); |
| 479 | assert(VL.Locs.size() == 1 &&(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 480, __extension__ __PRETTY_FUNCTION__)) |
| 480 | VL.Locs[0].Kind == MachineLocKind::RegisterKind)(static_cast <bool> (VL.Locs.size() == 1 && VL. Locs[0].Kind == MachineLocKind::RegisterKind) ? void (0) : __assert_fail ("VL.Locs.size() == 1 && VL.Locs[0].Kind == MachineLocKind::RegisterKind" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 480, __extension__ __PRETTY_FUNCTION__)); |
| 481 | VL.EVKind = EntryValueLocKind::EntryValueCopyBackupKind; |
| 482 | VL.Expr = EntryExpr; |
| 483 | VL.Locs[0].Value.RegNo = NewReg; |
| 484 | return VL; |
| 485 | } |
| 486 | |
| 487 | /// Copy the register location in DBG_VALUE MI, updating the register to |
| 488 | /// be NewReg. |
| 489 | static VarLoc CreateCopyLoc(const VarLoc &OldVL, const MachineLoc &OldML, |
| 490 | Register NewReg) { |
| 491 | VarLoc VL = OldVL; |
| 492 | for (size_t I = 0, E = VL.Locs.size(); I < E; ++I) |
| 493 | if (VL.Locs[I] == OldML) { |
| 494 | VL.Locs[I].Kind = MachineLocKind::RegisterKind; |
| 495 | VL.Locs[I].Value.RegNo = NewReg; |
| 496 | return VL; |
| 497 | } |
| 498 | llvm_unreachable("Should have found OldML in new VarLoc.")::llvm::llvm_unreachable_internal("Should have found OldML in new VarLoc." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 498); |
| 499 | } |
| 500 | |
| 501 | /// Take the variable described by DBG_VALUE* MI, and create a VarLoc |
| 502 | /// locating it in the specified spill location. |
| 503 | static VarLoc CreateSpillLoc(const VarLoc &OldVL, const MachineLoc &OldML, |
| 504 | unsigned SpillBase, StackOffset SpillOffset) { |
| 505 | VarLoc VL = OldVL; |
| 506 | for (int I = 0, E = VL.Locs.size(); I < E; ++I) |
| 507 | if (VL.Locs[I] == OldML) { |
| 508 | VL.Locs[I].Kind = MachineLocKind::SpillLocKind; |
| 509 | VL.Locs[I].Value.SpillLocation = {SpillBase, SpillOffset}; |
| 510 | return VL; |
| 511 | } |
| 512 | llvm_unreachable("Should have found OldML in new VarLoc.")::llvm::llvm_unreachable_internal("Should have found OldML in new VarLoc." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 512); |
| 513 | } |
| 514 | |
| 515 | /// Create a DBG_VALUE representing this VarLoc in the given function. |
| 516 | /// Copies variable-specific information such as DILocalVariable and |
| 517 | /// inlining information from the original DBG_VALUE instruction, which may |
| 518 | /// have been several transfers ago. |
| 519 | MachineInstr *BuildDbgValue(MachineFunction &MF) const { |
| 520 | assert(!isEntryBackupLoc() &&(static_cast <bool> (!isEntryBackupLoc() && "Tried to produce DBG_VALUE for backup VarLoc" ) ? void (0) : __assert_fail ("!isEntryBackupLoc() && \"Tried to produce DBG_VALUE for backup VarLoc\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 521, __extension__ __PRETTY_FUNCTION__)) |
| 521 | "Tried to produce DBG_VALUE for backup VarLoc")(static_cast <bool> (!isEntryBackupLoc() && "Tried to produce DBG_VALUE for backup VarLoc" ) ? void (0) : __assert_fail ("!isEntryBackupLoc() && \"Tried to produce DBG_VALUE for backup VarLoc\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 521, __extension__ __PRETTY_FUNCTION__)); |
| 522 | const DebugLoc &DbgLoc = MI.getDebugLoc(); |
| 523 | bool Indirect = MI.isIndirectDebugValue(); |
| 524 | const auto &IID = MI.getDesc(); |
| 525 | const DILocalVariable *Var = MI.getDebugVariable(); |
| 526 | NumInserted++; |
| 527 | |
| 528 | const DIExpression *DIExpr = Expr; |
| 529 | SmallVector<MachineOperand, 8> MOs; |
| 530 | for (unsigned I = 0, E = Locs.size(); I < E; ++I) { |
| 531 | MachineLocKind LocKind = Locs[I].Kind; |
| 532 | MachineLocValue Loc = Locs[I].Value; |
| 533 | const MachineOperand &Orig = MI.getDebugOperand(OrigLocMap[I]); |
| 534 | switch (LocKind) { |
| 535 | case MachineLocKind::RegisterKind: |
| 536 | // An entry value is a register location -- but with an updated |
| 537 | // expression. The register location of such DBG_VALUE is always the |
| 538 | // one from the entry DBG_VALUE, it does not matter if the entry value |
| 539 | // was copied in to another register due to some optimizations. |
| 540 | // Non-entry value register locations are like the source |
| 541 | // DBG_VALUE, but with the register number from this VarLoc. |
| 542 | MOs.push_back(MachineOperand::CreateReg( |
| 543 | EVKind == EntryValueLocKind::EntryValueKind ? Orig.getReg() |
| 544 | : Register(Loc.RegNo), |
| 545 | false)); |
| 546 | MOs.back().setIsDebug(); |
| 547 | break; |
| 548 | case MachineLocKind::SpillLocKind: { |
| 549 | // Spills are indirect DBG_VALUEs, with a base register and offset. |
| 550 | // Use the original DBG_VALUEs expression to build the spilt location |
| 551 | // on top of. FIXME: spill locations created before this pass runs |
| 552 | // are not recognized, and not handled here. |
| 553 | unsigned Base = Loc.SpillLocation.SpillBase; |
| 554 | auto *TRI = MF.getSubtarget().getRegisterInfo(); |
| 555 | if (MI.isNonListDebugValue()) { |
| 556 | DIExpr = |
| 557 | TRI->prependOffsetExpression(DIExpr, DIExpression::ApplyOffset, |
| 558 | Loc.SpillLocation.SpillOffset); |
| 559 | Indirect = true; |
| 560 | } else { |
| 561 | SmallVector<uint64_t, 4> Ops; |
| 562 | TRI->getOffsetOpcodes(Loc.SpillLocation.SpillOffset, Ops); |
| 563 | Ops.push_back(dwarf::DW_OP_deref); |
| 564 | DIExpr = DIExpression::appendOpsToArg(DIExpr, Ops, I); |
| 565 | } |
| 566 | MOs.push_back(MachineOperand::CreateReg(Base, false)); |
| 567 | MOs.back().setIsDebug(); |
| 568 | break; |
| 569 | } |
| 570 | case MachineLocKind::ImmediateKind: { |
| 571 | MOs.push_back(Orig); |
| 572 | break; |
| 573 | } |
| 574 | case MachineLocKind::InvalidKind: |
| 575 | llvm_unreachable("Tried to produce DBG_VALUE for invalid VarLoc")::llvm::llvm_unreachable_internal("Tried to produce DBG_VALUE for invalid VarLoc" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 575); |
| 576 | } |
| 577 | } |
| 578 | return BuildMI(MF, DbgLoc, IID, Indirect, MOs, Var, DIExpr); |
| 579 | } |
| 580 | |
| 581 | /// Is the Loc field a constant or constant object? |
| 582 | bool isConstant(MachineLocKind Kind) const { |
| 583 | return Kind == MachineLocKind::ImmediateKind; |
| 584 | } |
| 585 | |
| 586 | /// Check if the Loc field is an entry backup location. |
| 587 | bool isEntryBackupLoc() const { |
| 588 | return EVKind == EntryValueLocKind::EntryValueBackupKind || |
| 589 | EVKind == EntryValueLocKind::EntryValueCopyBackupKind; |
| 590 | } |
| 591 | |
| 592 | /// If this variable is described by register \p Reg holding the entry |
| 593 | /// value, return true. |
| 594 | bool isEntryValueBackupReg(Register Reg) const { |
| 595 | return EVKind == EntryValueLocKind::EntryValueBackupKind && usesReg(Reg); |
| 596 | } |
| 597 | |
| 598 | /// If this variable is described by register \p Reg holding a copy of the |
| 599 | /// entry value, return true. |
| 600 | bool isEntryValueCopyBackupReg(Register Reg) const { |
| 601 | return EVKind == EntryValueLocKind::EntryValueCopyBackupKind && |
| 602 | usesReg(Reg); |
| 603 | } |
| 604 | |
| 605 | /// If this variable is described in whole or part by \p Reg, return true. |
| 606 | bool usesReg(Register Reg) const { |
| 607 | MachineLoc RegML; |
| 608 | RegML.Kind = MachineLocKind::RegisterKind; |
| 609 | RegML.Value.RegNo = Reg; |
| 610 | return is_contained(Locs, RegML); |
| 611 | } |
| 612 | |
| 613 | /// If this variable is described in whole or part by \p Reg, return true. |
| 614 | unsigned getRegIdx(Register Reg) const { |
| 615 | for (unsigned Idx = 0; Idx < Locs.size(); ++Idx) |
| 616 | if (Locs[Idx].Kind == MachineLocKind::RegisterKind && |
| 617 | Locs[Idx].Value.RegNo == Reg) |
| 618 | return Idx; |
| 619 | llvm_unreachable("Could not find given Reg in Locs")::llvm::llvm_unreachable_internal("Could not find given Reg in Locs" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 619); |
| 620 | } |
| 621 | |
| 622 | /// If this variable is described in whole or part by 1 or more registers, |
| 623 | /// add each of them to \p Regs and return true. |
| 624 | bool getDescribingRegs(SmallVectorImpl<uint32_t> &Regs) const { |
| 625 | bool AnyRegs = false; |
| 626 | for (auto Loc : Locs) |
| 627 | if (Loc.Kind == MachineLocKind::RegisterKind) { |
| 628 | Regs.push_back(Loc.Value.RegNo); |
| 629 | AnyRegs = true; |
| 630 | } |
| 631 | return AnyRegs; |
| 632 | } |
| 633 | |
| 634 | bool containsSpillLocs() const { |
| 635 | return any_of(Locs, [](VarLoc::MachineLoc ML) { |
| 636 | return ML.Kind == VarLoc::MachineLocKind::SpillLocKind; |
| 637 | }); |
| 638 | } |
| 639 | |
| 640 | /// If this variable is described in whole or part by \p SpillLocation, |
| 641 | /// return true. |
| 642 | bool usesSpillLoc(SpillLoc SpillLocation) const { |
| 643 | MachineLoc SpillML; |
| 644 | SpillML.Kind = MachineLocKind::SpillLocKind; |
| 645 | SpillML.Value.SpillLocation = SpillLocation; |
| 646 | return is_contained(Locs, SpillML); |
| 647 | } |
| 648 | |
| 649 | /// If this variable is described in whole or part by \p SpillLocation, |
| 650 | /// return the index . |
| 651 | unsigned getSpillLocIdx(SpillLoc SpillLocation) const { |
| 652 | for (unsigned Idx = 0; Idx < Locs.size(); ++Idx) |
| 653 | if (Locs[Idx].Kind == MachineLocKind::SpillLocKind && |
| 654 | Locs[Idx].Value.SpillLocation == SpillLocation) |
| 655 | return Idx; |
| 656 | llvm_unreachable("Could not find given SpillLoc in Locs")::llvm::llvm_unreachable_internal("Could not find given SpillLoc in Locs" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 656); |
| 657 | } |
| 658 | |
| 659 | /// Determine whether the lexical scope of this value's debug location |
| 660 | /// dominates MBB. |
| 661 | bool dominates(LexicalScopes &LS, MachineBasicBlock &MBB) const { |
| 662 | return LS.dominates(MI.getDebugLoc().get(), &MBB); |
| 663 | } |
| 664 | |
| 665 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
| 666 | // TRI can be null. |
| 667 | void dump(const TargetRegisterInfo *TRI, raw_ostream &Out = dbgs()) const { |
| 668 | Out << "VarLoc("; |
| 669 | for (const MachineLoc &MLoc : Locs) { |
| 670 | if (Locs.begin() != &MLoc) |
| 671 | Out << ", "; |
| 672 | switch (MLoc.Kind) { |
| 673 | case MachineLocKind::RegisterKind: |
| 674 | Out << printReg(MLoc.Value.RegNo, TRI); |
| 675 | break; |
| 676 | case MachineLocKind::SpillLocKind: |
| 677 | Out << printReg(MLoc.Value.SpillLocation.SpillBase, TRI); |
| 678 | Out << "[" << MLoc.Value.SpillLocation.SpillOffset.getFixed() << " + " |
| 679 | << MLoc.Value.SpillLocation.SpillOffset.getScalable() |
| 680 | << "x vscale" |
| 681 | << "]"; |
| 682 | break; |
| 683 | case MachineLocKind::ImmediateKind: |
| 684 | Out << MLoc.Value.Immediate; |
| 685 | break; |
| 686 | case MachineLocKind::InvalidKind: |
| 687 | llvm_unreachable("Invalid VarLoc in dump method")::llvm::llvm_unreachable_internal("Invalid VarLoc in dump method" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 687); |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | Out << ", \"" << Var.getVariable()->getName() << "\", " << *Expr << ", "; |
| 692 | if (Var.getInlinedAt()) |
| 693 | Out << "!" << Var.getInlinedAt()->getMetadataID() << ")\n"; |
| 694 | else |
| 695 | Out << "(null))"; |
| 696 | |
| 697 | if (isEntryBackupLoc()) |
| 698 | Out << " (backup loc)\n"; |
| 699 | else |
| 700 | Out << "\n"; |
| 701 | } |
| 702 | #endif |
| 703 | |
| 704 | bool operator==(const VarLoc &Other) const { |
| 705 | return std::tie(EVKind, Var, Expr, Locs) == |
| 706 | std::tie(Other.EVKind, Other.Var, Other.Expr, Other.Locs); |
| 707 | } |
| 708 | |
| 709 | /// This operator guarantees that VarLocs are sorted by Variable first. |
| 710 | bool operator<(const VarLoc &Other) const { |
| 711 | return std::tie(Var, EVKind, Locs, Expr) < |
| 712 | std::tie(Other.Var, Other.EVKind, Other.Locs, Other.Expr); |
| 713 | } |
| 714 | }; |
| 715 | |
| 716 | #ifndef NDEBUG |
| 717 | using VarVec = SmallVector<VarLoc, 32>; |
| 718 | #endif |
| 719 | |
| 720 | /// VarLocMap is used for two things: |
| 721 | /// 1) Assigning LocIndices to a VarLoc. The LocIndices can be used to |
| 722 | /// virtually insert a VarLoc into a VarLocSet. |
| 723 | /// 2) Given a LocIndex, look up the unique associated VarLoc. |
| 724 | class VarLocMap { |
| 725 | /// Map a VarLoc to an index within the vector reserved for its location |
| 726 | /// within Loc2Vars. |
| 727 | std::map<VarLoc, LocIndices> Var2Indices; |
| 728 | |
| 729 | /// Map a location to a vector which holds VarLocs which live in that |
| 730 | /// location. |
| 731 | SmallDenseMap<LocIndex::u32_location_t, std::vector<VarLoc>> Loc2Vars; |
| 732 | |
| 733 | public: |
| 734 | /// Retrieve LocIndices for \p VL. |
| 735 | LocIndices insert(const VarLoc &VL) { |
| 736 | LocIndices &Indices = Var2Indices[VL]; |
| 737 | // If Indices is not empty, VL is already in the map. |
| 738 | if (!Indices.empty()) |
| 739 | return Indices; |
| 740 | SmallVector<LocIndex::u32_location_t, 4> Locations; |
| 741 | // LocIndices are determined by EVKind and MLs; each Register has a |
| 742 | // unique location, while all SpillLocs use a single bucket, and any EV |
| 743 | // VarLocs use only the Backup bucket or none at all (except the |
| 744 | // compulsory entry at the universal location index). LocIndices will |
| 745 | // always have an index at the universal location index as the last index. |
| 746 | if (VL.EVKind == VarLoc::EntryValueLocKind::NonEntryValueKind) { |
| 747 | VL.getDescribingRegs(Locations); |
| 748 | assert(all_of(Locations,(static_cast <bool> (all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && "Physreg out of range?") ? void (0) : __assert_fail ("all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && \"Physreg out of range?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 752, __extension__ __PRETTY_FUNCTION__)) |
| 749 | [](auto RegNo) {(static_cast <bool> (all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && "Physreg out of range?") ? void (0) : __assert_fail ("all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && \"Physreg out of range?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 752, __extension__ __PRETTY_FUNCTION__)) |
| 750 | return RegNo < LocIndex::kFirstInvalidRegLocation;(static_cast <bool> (all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && "Physreg out of range?") ? void (0) : __assert_fail ("all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && \"Physreg out of range?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 752, __extension__ __PRETTY_FUNCTION__)) |
| 751 | }) &&(static_cast <bool> (all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && "Physreg out of range?") ? void (0) : __assert_fail ("all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && \"Physreg out of range?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 752, __extension__ __PRETTY_FUNCTION__)) |
| 752 | "Physreg out of range?")(static_cast <bool> (all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && "Physreg out of range?") ? void (0) : __assert_fail ("all_of(Locations, [](auto RegNo) { return RegNo < LocIndex::kFirstInvalidRegLocation; }) && \"Physreg out of range?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 752, __extension__ __PRETTY_FUNCTION__)); |
| 753 | if (VL.containsSpillLocs()) { |
| 754 | LocIndex::u32_location_t Loc = LocIndex::kSpillLocation; |
| 755 | Locations.push_back(Loc); |
| 756 | } |
| 757 | } else if (VL.EVKind != VarLoc::EntryValueLocKind::EntryValueKind) { |
| 758 | LocIndex::u32_location_t Loc = LocIndex::kEntryValueBackupLocation; |
| 759 | Locations.push_back(Loc); |
| 760 | } |
| 761 | Locations.push_back(LocIndex::kUniversalLocation); |
| 762 | for (LocIndex::u32_location_t Location : Locations) { |
| 763 | auto &Vars = Loc2Vars[Location]; |
| 764 | Indices.push_back( |
| 765 | {Location, static_cast<LocIndex::u32_index_t>(Vars.size())}); |
| 766 | Vars.push_back(VL); |
| 767 | } |
| 768 | return Indices; |
| 769 | } |
| 770 | |
| 771 | LocIndices getAllIndices(const VarLoc &VL) const { |
| 772 | auto IndIt = Var2Indices.find(VL); |
| 773 | assert(IndIt != Var2Indices.end() && "VarLoc not tracked")(static_cast <bool> (IndIt != Var2Indices.end() && "VarLoc not tracked") ? void (0) : __assert_fail ("IndIt != Var2Indices.end() && \"VarLoc not tracked\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 773, __extension__ __PRETTY_FUNCTION__)); |
| 774 | return IndIt->second; |
| 775 | } |
| 776 | |
| 777 | /// Retrieve the unique VarLoc associated with \p ID. |
| 778 | const VarLoc &operator[](LocIndex ID) const { |
| 779 | auto LocIt = Loc2Vars.find(ID.Location); |
| 780 | assert(LocIt != Loc2Vars.end() && "Location not tracked")(static_cast <bool> (LocIt != Loc2Vars.end() && "Location not tracked") ? void (0) : __assert_fail ("LocIt != Loc2Vars.end() && \"Location not tracked\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 780, __extension__ __PRETTY_FUNCTION__)); |
| 781 | return LocIt->second[ID.Index]; |
| 782 | } |
| 783 | }; |
| 784 | |
| 785 | using VarLocInMBB = |
| 786 | SmallDenseMap<const MachineBasicBlock *, std::unique_ptr<VarLocSet>>; |
| 787 | struct TransferDebugPair { |
| 788 | MachineInstr *TransferInst; ///< Instruction where this transfer occurs. |
| 789 | LocIndex LocationID; ///< Location number for the transfer dest. |
| 790 | }; |
| 791 | using TransferMap = SmallVector<TransferDebugPair, 4>; |
| 792 | |
| 793 | // Types for recording sets of variable fragments that overlap. For a given |
| 794 | // local variable, we record all other fragments of that variable that could |
| 795 | // overlap it, to reduce search time. |
| 796 | using FragmentOfVar = |
| 797 | std::pair<const DILocalVariable *, DIExpression::FragmentInfo>; |
| 798 | using OverlapMap = |
| 799 | DenseMap<FragmentOfVar, SmallVector<DIExpression::FragmentInfo, 1>>; |
| 800 | |
| 801 | // Helper while building OverlapMap, a map of all fragments seen for a given |
| 802 | // DILocalVariable. |
| 803 | using VarToFragments = |
| 804 | DenseMap<const DILocalVariable *, SmallSet<FragmentInfo, 4>>; |
| 805 | |
| 806 | /// Collects all VarLocs from \p CollectFrom. Each unique VarLoc is added |
| 807 | /// to \p Collected once, in order of insertion into \p VarLocIDs. |
| 808 | static void collectAllVarLocs(SmallVectorImpl<VarLoc> &Collected, |
| 809 | const VarLocSet &CollectFrom, |
| 810 | const VarLocMap &VarLocIDs); |
| 811 | |
| 812 | /// Get the registers which are used by VarLocs of kind RegisterKind tracked |
| 813 | /// by \p CollectFrom. |
| 814 | void getUsedRegs(const VarLocSet &CollectFrom, |
| 815 | SmallVectorImpl<Register> &UsedRegs) const; |
| 816 | |
| 817 | /// This holds the working set of currently open ranges. For fast |
| 818 | /// access, this is done both as a set of VarLocIDs, and a map of |
| 819 | /// DebugVariable to recent VarLocID. Note that a DBG_VALUE ends all |
| 820 | /// previous open ranges for the same variable. In addition, we keep |
| 821 | /// two different maps (Vars/EntryValuesBackupVars), so erase/insert |
| 822 | /// methods act differently depending on whether a VarLoc is primary |
| 823 | /// location or backup one. In the case the VarLoc is backup location |
| 824 | /// we will erase/insert from the EntryValuesBackupVars map, otherwise |
| 825 | /// we perform the operation on the Vars. |
| 826 | class OpenRangesSet { |
| 827 | VarLocSet::Allocator &Alloc; |
| 828 | VarLocSet VarLocs; |
| 829 | // Map the DebugVariable to recent primary location ID. |
| 830 | SmallDenseMap<DebugVariable, LocIndices, 8> Vars; |
| 831 | // Map the DebugVariable to recent backup location ID. |
| 832 | SmallDenseMap<DebugVariable, LocIndices, 8> EntryValuesBackupVars; |
| 833 | OverlapMap &OverlappingFragments; |
| 834 | |
| 835 | public: |
| 836 | OpenRangesSet(VarLocSet::Allocator &Alloc, OverlapMap &_OLapMap) |
| 837 | : Alloc(Alloc), VarLocs(Alloc), OverlappingFragments(_OLapMap) {} |
| 838 | |
| 839 | const VarLocSet &getVarLocs() const { return VarLocs; } |
| 840 | |
| 841 | // Fetches all VarLocs in \p VarLocIDs and inserts them into \p Collected. |
| 842 | // This method is needed to get every VarLoc once, as each VarLoc may have |
| 843 | // multiple indices in a VarLocMap (corresponding to each applicable |
| 844 | // location), but all VarLocs appear exactly once at the universal location |
| 845 | // index. |
| 846 | void getUniqueVarLocs(SmallVectorImpl<VarLoc> &Collected, |
| 847 | const VarLocMap &VarLocIDs) const { |
| 848 | collectAllVarLocs(Collected, VarLocs, VarLocIDs); |
| 849 | } |
| 850 | |
| 851 | /// Terminate all open ranges for VL.Var by removing it from the set. |
| 852 | void erase(const VarLoc &VL); |
| 853 | |
| 854 | /// Terminate all open ranges listed as indices in \c KillSet with |
| 855 | /// \c Location by removing them from the set. |
| 856 | void erase(const VarLocsInRange &KillSet, const VarLocMap &VarLocIDs, |
| 857 | LocIndex::u32_location_t Location); |
| 858 | |
| 859 | /// Insert a new range into the set. |
| 860 | void insert(LocIndices VarLocIDs, const VarLoc &VL); |
| 861 | |
| 862 | /// Insert a set of ranges. |
| 863 | void insertFromLocSet(const VarLocSet &ToLoad, const VarLocMap &Map); |
| 864 | |
| 865 | llvm::Optional<LocIndices> getEntryValueBackup(DebugVariable Var); |
| 866 | |
| 867 | /// Empty the set. |
| 868 | void clear() { |
| 869 | VarLocs.clear(); |
| 870 | Vars.clear(); |
| 871 | EntryValuesBackupVars.clear(); |
| 872 | } |
| 873 | |
| 874 | /// Return whether the set is empty or not. |
| 875 | bool empty() const { |
| 876 | assert(Vars.empty() == EntryValuesBackupVars.empty() &&(static_cast <bool> (Vars.empty() == EntryValuesBackupVars .empty() && Vars.empty() == VarLocs.empty() && "open ranges are inconsistent") ? void (0) : __assert_fail ( "Vars.empty() == EntryValuesBackupVars.empty() && Vars.empty() == VarLocs.empty() && \"open ranges are inconsistent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 878, __extension__ __PRETTY_FUNCTION__)) |
| 877 | Vars.empty() == VarLocs.empty() &&(static_cast <bool> (Vars.empty() == EntryValuesBackupVars .empty() && Vars.empty() == VarLocs.empty() && "open ranges are inconsistent") ? void (0) : __assert_fail ( "Vars.empty() == EntryValuesBackupVars.empty() && Vars.empty() == VarLocs.empty() && \"open ranges are inconsistent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 878, __extension__ __PRETTY_FUNCTION__)) |
| 878 | "open ranges are inconsistent")(static_cast <bool> (Vars.empty() == EntryValuesBackupVars .empty() && Vars.empty() == VarLocs.empty() && "open ranges are inconsistent") ? void (0) : __assert_fail ( "Vars.empty() == EntryValuesBackupVars.empty() && Vars.empty() == VarLocs.empty() && \"open ranges are inconsistent\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 878, __extension__ __PRETTY_FUNCTION__)); |
| 879 | return VarLocs.empty(); |
| 880 | } |
| 881 | |
| 882 | /// Get an empty range of VarLoc IDs. |
| 883 | auto getEmptyVarLocRange() const { |
| 884 | return iterator_range<VarLocSet::const_iterator>(getVarLocs().end(), |
| 885 | getVarLocs().end()); |
| 886 | } |
| 887 | |
| 888 | /// Get all set IDs for VarLocs with MLs of kind RegisterKind in \p Reg. |
| 889 | auto getRegisterVarLocs(Register Reg) const { |
| 890 | return LocIndex::indexRangeForLocation(getVarLocs(), Reg); |
| 891 | } |
| 892 | |
| 893 | /// Get all set IDs for VarLocs with MLs of kind SpillLocKind. |
| 894 | auto getSpillVarLocs() const { |
| 895 | return LocIndex::indexRangeForLocation(getVarLocs(), |
| 896 | LocIndex::kSpillLocation); |
| 897 | } |
| 898 | |
| 899 | /// Get all set IDs for VarLocs of EVKind EntryValueBackupKind or |
| 900 | /// EntryValueCopyBackupKind. |
| 901 | auto getEntryValueBackupVarLocs() const { |
| 902 | return LocIndex::indexRangeForLocation( |
| 903 | getVarLocs(), LocIndex::kEntryValueBackupLocation); |
| 904 | } |
| 905 | }; |
| 906 | |
| 907 | /// Collect all VarLoc IDs from \p CollectFrom for VarLocs with MLs of kind |
| 908 | /// RegisterKind which are located in any reg in \p Regs. The IDs for each |
| 909 | /// VarLoc correspond to entries in the universal location bucket, which every |
| 910 | /// VarLoc has exactly 1 entry for. Insert collected IDs into \p Collected. |
| 911 | static void collectIDsForRegs(VarLocsInRange &Collected, |
| 912 | const DefinedRegsSet &Regs, |
| 913 | const VarLocSet &CollectFrom, |
| 914 | const VarLocMap &VarLocIDs); |
| 915 | |
| 916 | VarLocSet &getVarLocsInMBB(const MachineBasicBlock *MBB, VarLocInMBB &Locs) { |
| 917 | std::unique_ptr<VarLocSet> &VLS = Locs[MBB]; |
| 918 | if (!VLS) |
| 919 | VLS = std::make_unique<VarLocSet>(Alloc); |
| 920 | return *VLS.get(); |
| 921 | } |
| 922 | |
| 923 | const VarLocSet &getVarLocsInMBB(const MachineBasicBlock *MBB, |
| 924 | const VarLocInMBB &Locs) const { |
| 925 | auto It = Locs.find(MBB); |
| 926 | assert(It != Locs.end() && "MBB not in map")(static_cast <bool> (It != Locs.end() && "MBB not in map" ) ? void (0) : __assert_fail ("It != Locs.end() && \"MBB not in map\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 926, __extension__ __PRETTY_FUNCTION__)); |
| 927 | return *It->second.get(); |
| 928 | } |
| 929 | |
| 930 | /// Tests whether this instruction is a spill to a stack location. |
| 931 | bool isSpillInstruction(const MachineInstr &MI, MachineFunction *MF); |
| 932 | |
| 933 | /// Decide if @MI is a spill instruction and return true if it is. We use 2 |
| 934 | /// criteria to make this decision: |
| 935 | /// - Is this instruction a store to a spill slot? |
| 936 | /// - Is there a register operand that is both used and killed? |
| 937 | /// TODO: Store optimization can fold spills into other stores (including |
| 938 | /// other spills). We do not handle this yet (more than one memory operand). |
| 939 | bool isLocationSpill(const MachineInstr &MI, MachineFunction *MF, |
| 940 | Register &Reg); |
| 941 | |
| 942 | /// Returns true if the given machine instruction is a debug value which we |
| 943 | /// can emit entry values for. |
| 944 | /// |
| 945 | /// Currently, we generate debug entry values only for parameters that are |
| 946 | /// unmodified throughout the function and located in a register. |
| 947 | bool isEntryValueCandidate(const MachineInstr &MI, |
| 948 | const DefinedRegsSet &Regs) const; |
| 949 | |
| 950 | /// If a given instruction is identified as a spill, return the spill location |
| 951 | /// and set \p Reg to the spilled register. |
| 952 | Optional<VarLoc::SpillLoc> isRestoreInstruction(const MachineInstr &MI, |
| 953 | MachineFunction *MF, |
| 954 | Register &Reg); |
| 955 | /// Given a spill instruction, extract the register and offset used to |
| 956 | /// address the spill location in a target independent way. |
| 957 | VarLoc::SpillLoc extractSpillBaseRegAndOffset(const MachineInstr &MI); |
| 958 | void insertTransferDebugPair(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 959 | TransferMap &Transfers, VarLocMap &VarLocIDs, |
| 960 | LocIndex OldVarID, TransferKind Kind, |
| 961 | const VarLoc::MachineLoc &OldLoc, |
| 962 | Register NewReg = Register()); |
| 963 | |
| 964 | void transferDebugValue(const MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 965 | VarLocMap &VarLocIDs); |
| 966 | void transferSpillOrRestoreInst(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 967 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
| 968 | bool removeEntryValue(const MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 969 | VarLocMap &VarLocIDs, const VarLoc &EntryVL); |
| 970 | void emitEntryValues(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 971 | VarLocMap &VarLocIDs, TransferMap &Transfers, |
| 972 | VarLocsInRange &KillSet); |
| 973 | void recordEntryValue(const MachineInstr &MI, |
| 974 | const DefinedRegsSet &DefinedRegs, |
| 975 | OpenRangesSet &OpenRanges, VarLocMap &VarLocIDs); |
| 976 | void transferRegisterCopy(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 977 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
| 978 | void transferRegisterDef(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 979 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
| 980 | bool transferTerminator(MachineBasicBlock *MBB, OpenRangesSet &OpenRanges, |
| 981 | VarLocInMBB &OutLocs, const VarLocMap &VarLocIDs); |
| 982 | |
| 983 | void process(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 984 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
| 985 | |
| 986 | void accumulateFragmentMap(MachineInstr &MI, VarToFragments &SeenFragments, |
| 987 | OverlapMap &OLapMap); |
| 988 | |
| 989 | bool join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs, |
| 990 | const VarLocMap &VarLocIDs, |
| 991 | SmallPtrSet<const MachineBasicBlock *, 16> &Visited, |
| 992 | SmallPtrSetImpl<const MachineBasicBlock *> &ArtificialBlocks); |
| 993 | |
| 994 | /// Create DBG_VALUE insts for inlocs that have been propagated but |
| 995 | /// had their instruction creation deferred. |
| 996 | void flushPendingLocs(VarLocInMBB &PendingInLocs, VarLocMap &VarLocIDs); |
| 997 | |
| 998 | bool ExtendRanges(MachineFunction &MF, TargetPassConfig *TPC, |
| 999 | unsigned InputBBLimit, unsigned InputDbgValLimit) override; |
| 1000 | |
| 1001 | public: |
| 1002 | /// Default construct and initialize the pass. |
| 1003 | VarLocBasedLDV(); |
| 1004 | |
| 1005 | ~VarLocBasedLDV(); |
| 1006 | |
| 1007 | /// Print to ostream with a message. |
| 1008 | void printVarLocInMBB(const MachineFunction &MF, const VarLocInMBB &V, |
| 1009 | const VarLocMap &VarLocIDs, const char *msg, |
| 1010 | raw_ostream &Out) const; |
| 1011 | }; |
| 1012 | |
| 1013 | } // end anonymous namespace |
| 1014 | |
| 1015 | //===----------------------------------------------------------------------===// |
| 1016 | // Implementation |
| 1017 | //===----------------------------------------------------------------------===// |
| 1018 | |
| 1019 | VarLocBasedLDV::VarLocBasedLDV() { } |
| 1020 | |
| 1021 | VarLocBasedLDV::~VarLocBasedLDV() { } |
| 1022 | |
| 1023 | /// Erase a variable from the set of open ranges, and additionally erase any |
| 1024 | /// fragments that may overlap it. If the VarLoc is a backup location, erase |
| 1025 | /// the variable from the EntryValuesBackupVars set, indicating we should stop |
| 1026 | /// tracking its backup entry location. Otherwise, if the VarLoc is primary |
| 1027 | /// location, erase the variable from the Vars set. |
| 1028 | void VarLocBasedLDV::OpenRangesSet::erase(const VarLoc &VL) { |
| 1029 | // Erasure helper. |
| 1030 | auto DoErase = [VL, this](DebugVariable VarToErase) { |
| 1031 | auto *EraseFrom = VL.isEntryBackupLoc() ? &EntryValuesBackupVars : &Vars; |
| 1032 | auto It = EraseFrom->find(VarToErase); |
| 1033 | if (It != EraseFrom->end()) { |
| 1034 | LocIndices IDs = It->second; |
| 1035 | for (LocIndex ID : IDs) |
| 1036 | VarLocs.reset(ID.getAsRawInteger()); |
| 1037 | EraseFrom->erase(It); |
| 1038 | } |
| 1039 | }; |
| 1040 | |
| 1041 | DebugVariable Var = VL.Var; |
| 1042 | |
| 1043 | // Erase the variable/fragment that ends here. |
| 1044 | DoErase(Var); |
| 1045 | |
| 1046 | // Extract the fragment. Interpret an empty fragment as one that covers all |
| 1047 | // possible bits. |
| 1048 | FragmentInfo ThisFragment = Var.getFragmentOrDefault(); |
| 1049 | |
| 1050 | // There may be fragments that overlap the designated fragment. Look them up |
| 1051 | // in the pre-computed overlap map, and erase them too. |
| 1052 | auto MapIt = OverlappingFragments.find({Var.getVariable(), ThisFragment}); |
| 1053 | if (MapIt != OverlappingFragments.end()) { |
| 1054 | for (auto Fragment : MapIt->second) { |
| 1055 | VarLocBasedLDV::OptFragmentInfo FragmentHolder; |
| 1056 | if (!DebugVariable::isDefaultFragment(Fragment)) |
| 1057 | FragmentHolder = VarLocBasedLDV::OptFragmentInfo(Fragment); |
| 1058 | DoErase({Var.getVariable(), FragmentHolder, Var.getInlinedAt()}); |
| 1059 | } |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | void VarLocBasedLDV::OpenRangesSet::erase(const VarLocsInRange &KillSet, |
| 1064 | const VarLocMap &VarLocIDs, |
| 1065 | LocIndex::u32_location_t Location) { |
| 1066 | VarLocSet RemoveSet(Alloc); |
| 1067 | for (LocIndex::u32_index_t ID : KillSet) { |
| 1068 | const VarLoc &VL = VarLocIDs[LocIndex(Location, ID)]; |
| 1069 | auto *EraseFrom = VL.isEntryBackupLoc() ? &EntryValuesBackupVars : &Vars; |
| 1070 | EraseFrom->erase(VL.Var); |
| 1071 | LocIndices VLI = VarLocIDs.getAllIndices(VL); |
| 1072 | for (LocIndex ID : VLI) |
| 1073 | RemoveSet.set(ID.getAsRawInteger()); |
| 1074 | } |
| 1075 | VarLocs.intersectWithComplement(RemoveSet); |
| 1076 | } |
| 1077 | |
| 1078 | void VarLocBasedLDV::OpenRangesSet::insertFromLocSet(const VarLocSet &ToLoad, |
| 1079 | const VarLocMap &Map) { |
| 1080 | VarLocsInRange UniqueVarLocIDs; |
| 1081 | DefinedRegsSet Regs; |
| 1082 | Regs.insert(LocIndex::kUniversalLocation); |
| 1083 | collectIDsForRegs(UniqueVarLocIDs, Regs, ToLoad, Map); |
| 1084 | for (uint64_t ID : UniqueVarLocIDs) { |
| 1085 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1086 | const VarLoc &VarL = Map[Idx]; |
| 1087 | const LocIndices Indices = Map.getAllIndices(VarL); |
| 1088 | insert(Indices, VarL); |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | void VarLocBasedLDV::OpenRangesSet::insert(LocIndices VarLocIDs, |
| 1093 | const VarLoc &VL) { |
| 1094 | auto *InsertInto = VL.isEntryBackupLoc() ? &EntryValuesBackupVars : &Vars; |
| 1095 | for (LocIndex ID : VarLocIDs) |
| 1096 | VarLocs.set(ID.getAsRawInteger()); |
| 1097 | InsertInto->insert({VL.Var, VarLocIDs}); |
| 1098 | } |
| 1099 | |
| 1100 | /// Return the Loc ID of an entry value backup location, if it exists for the |
| 1101 | /// variable. |
| 1102 | llvm::Optional<LocIndices> |
| 1103 | VarLocBasedLDV::OpenRangesSet::getEntryValueBackup(DebugVariable Var) { |
| 1104 | auto It = EntryValuesBackupVars.find(Var); |
| 1105 | if (It != EntryValuesBackupVars.end()) |
| 1106 | return It->second; |
| 1107 | |
| 1108 | return llvm::None; |
| 1109 | } |
| 1110 | |
| 1111 | void VarLocBasedLDV::collectIDsForRegs(VarLocsInRange &Collected, |
| 1112 | const DefinedRegsSet &Regs, |
| 1113 | const VarLocSet &CollectFrom, |
| 1114 | const VarLocMap &VarLocIDs) { |
| 1115 | assert(!Regs.empty() && "Nothing to collect")(static_cast <bool> (!Regs.empty() && "Nothing to collect" ) ? void (0) : __assert_fail ("!Regs.empty() && \"Nothing to collect\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1115, __extension__ __PRETTY_FUNCTION__)); |
| 1116 | SmallVector<Register, 32> SortedRegs; |
| 1117 | append_range(SortedRegs, Regs); |
| 1118 | array_pod_sort(SortedRegs.begin(), SortedRegs.end()); |
| 1119 | auto It = CollectFrom.find(LocIndex::rawIndexForReg(SortedRegs.front())); |
| 1120 | auto End = CollectFrom.end(); |
| 1121 | for (Register Reg : SortedRegs) { |
| 1122 | // The half-open interval [FirstIndexForReg, FirstInvalidIndex) contains |
| 1123 | // all possible VarLoc IDs for VarLocs with MLs of kind RegisterKind which |
| 1124 | // live in Reg. |
| 1125 | uint64_t FirstIndexForReg = LocIndex::rawIndexForReg(Reg); |
| 1126 | uint64_t FirstInvalidIndex = LocIndex::rawIndexForReg(Reg + 1); |
| 1127 | It.advanceToLowerBound(FirstIndexForReg); |
| 1128 | |
| 1129 | // Iterate through that half-open interval and collect all the set IDs. |
| 1130 | for (; It != End && *It < FirstInvalidIndex; ++It) { |
| 1131 | LocIndex ItIdx = LocIndex::fromRawInteger(*It); |
| 1132 | const VarLoc &VL = VarLocIDs[ItIdx]; |
| 1133 | LocIndices LI = VarLocIDs.getAllIndices(VL); |
| 1134 | // For now, the back index is always the universal location index. |
| 1135 | assert(LI.back().Location == LocIndex::kUniversalLocation &&(static_cast <bool> (LI.back().Location == LocIndex::kUniversalLocation && "Unexpected order of LocIndices for VarLoc; was it inserted into " "the VarLocMap correctly?") ? void (0) : __assert_fail ("LI.back().Location == LocIndex::kUniversalLocation && \"Unexpected order of LocIndices for VarLoc; was it inserted into \" \"the VarLocMap correctly?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1137, __extension__ __PRETTY_FUNCTION__)) |
| 1136 | "Unexpected order of LocIndices for VarLoc; was it inserted into "(static_cast <bool> (LI.back().Location == LocIndex::kUniversalLocation && "Unexpected order of LocIndices for VarLoc; was it inserted into " "the VarLocMap correctly?") ? void (0) : __assert_fail ("LI.back().Location == LocIndex::kUniversalLocation && \"Unexpected order of LocIndices for VarLoc; was it inserted into \" \"the VarLocMap correctly?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1137, __extension__ __PRETTY_FUNCTION__)) |
| 1137 | "the VarLocMap correctly?")(static_cast <bool> (LI.back().Location == LocIndex::kUniversalLocation && "Unexpected order of LocIndices for VarLoc; was it inserted into " "the VarLocMap correctly?") ? void (0) : __assert_fail ("LI.back().Location == LocIndex::kUniversalLocation && \"Unexpected order of LocIndices for VarLoc; was it inserted into \" \"the VarLocMap correctly?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1137, __extension__ __PRETTY_FUNCTION__)); |
| 1138 | Collected.insert(LI.back().Index); |
| 1139 | } |
| 1140 | |
| 1141 | if (It == End) |
| 1142 | return; |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | void VarLocBasedLDV::getUsedRegs(const VarLocSet &CollectFrom, |
| 1147 | SmallVectorImpl<Register> &UsedRegs) const { |
| 1148 | // All register-based VarLocs are assigned indices greater than or equal to |
| 1149 | // FirstRegIndex. |
| 1150 | uint64_t FirstRegIndex = |
| 1151 | LocIndex::rawIndexForReg(LocIndex::kFirstRegLocation); |
| 1152 | uint64_t FirstInvalidIndex = |
| 1153 | LocIndex::rawIndexForReg(LocIndex::kFirstInvalidRegLocation); |
| 1154 | for (auto It = CollectFrom.find(FirstRegIndex), |
| 1155 | End = CollectFrom.find(FirstInvalidIndex); |
| 1156 | It != End;) { |
| 1157 | // We found a VarLoc ID for a VarLoc that lives in a register. Figure out |
| 1158 | // which register and add it to UsedRegs. |
| 1159 | uint32_t FoundReg = LocIndex::fromRawInteger(*It).Location; |
| 1160 | assert((UsedRegs.empty() || FoundReg != UsedRegs.back()) &&(static_cast <bool> ((UsedRegs.empty() || FoundReg != UsedRegs .back()) && "Duplicate used reg") ? void (0) : __assert_fail ("(UsedRegs.empty() || FoundReg != UsedRegs.back()) && \"Duplicate used reg\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1161, __extension__ __PRETTY_FUNCTION__)) |
| 1161 | "Duplicate used reg")(static_cast <bool> ((UsedRegs.empty() || FoundReg != UsedRegs .back()) && "Duplicate used reg") ? void (0) : __assert_fail ("(UsedRegs.empty() || FoundReg != UsedRegs.back()) && \"Duplicate used reg\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1161, __extension__ __PRETTY_FUNCTION__)); |
| 1162 | UsedRegs.push_back(FoundReg); |
| 1163 | |
| 1164 | // Skip to the next /set/ register. Note that this finds a lower bound, so |
| 1165 | // even if there aren't any VarLocs living in `FoundReg+1`, we're still |
| 1166 | // guaranteed to move on to the next register (or to end()). |
| 1167 | uint64_t NextRegIndex = LocIndex::rawIndexForReg(FoundReg + 1); |
| 1168 | It.advanceToLowerBound(NextRegIndex); |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | //===----------------------------------------------------------------------===// |
| 1173 | // Debug Range Extension Implementation |
| 1174 | //===----------------------------------------------------------------------===// |
| 1175 | |
| 1176 | #ifndef NDEBUG |
| 1177 | void VarLocBasedLDV::printVarLocInMBB(const MachineFunction &MF, |
| 1178 | const VarLocInMBB &V, |
| 1179 | const VarLocMap &VarLocIDs, |
| 1180 | const char *msg, |
| 1181 | raw_ostream &Out) const { |
| 1182 | Out << '\n' << msg << '\n'; |
| 1183 | for (const MachineBasicBlock &BB : MF) { |
| 1184 | if (!V.count(&BB)) |
| 1185 | continue; |
| 1186 | const VarLocSet &L = getVarLocsInMBB(&BB, V); |
| 1187 | if (L.empty()) |
| 1188 | continue; |
| 1189 | SmallVector<VarLoc, 32> VarLocs; |
| 1190 | collectAllVarLocs(VarLocs, L, VarLocIDs); |
| 1191 | Out << "MBB: " << BB.getNumber() << ":\n"; |
| 1192 | for (const VarLoc &VL : VarLocs) { |
| 1193 | Out << " Var: " << VL.Var.getVariable()->getName(); |
| 1194 | Out << " MI: "; |
| 1195 | VL.dump(TRI, Out); |
| 1196 | } |
| 1197 | } |
| 1198 | Out << "\n"; |
| 1199 | } |
| 1200 | #endif |
| 1201 | |
| 1202 | VarLocBasedLDV::VarLoc::SpillLoc |
| 1203 | VarLocBasedLDV::extractSpillBaseRegAndOffset(const MachineInstr &MI) { |
| 1204 | assert(MI.hasOneMemOperand() &&(static_cast <bool> (MI.hasOneMemOperand() && "Spill instruction does not have exactly one memory operand?" ) ? void (0) : __assert_fail ("MI.hasOneMemOperand() && \"Spill instruction does not have exactly one memory operand?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1205, __extension__ __PRETTY_FUNCTION__)) |
| 1205 | "Spill instruction does not have exactly one memory operand?")(static_cast <bool> (MI.hasOneMemOperand() && "Spill instruction does not have exactly one memory operand?" ) ? void (0) : __assert_fail ("MI.hasOneMemOperand() && \"Spill instruction does not have exactly one memory operand?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1205, __extension__ __PRETTY_FUNCTION__)); |
| 1206 | auto MMOI = MI.memoperands_begin(); |
| 1207 | const PseudoSourceValue *PVal = (*MMOI)->getPseudoValue(); |
| 1208 | assert(PVal->kind() == PseudoSourceValue::FixedStack &&(static_cast <bool> (PVal->kind() == PseudoSourceValue ::FixedStack && "Inconsistent memory operand in spill instruction" ) ? void (0) : __assert_fail ("PVal->kind() == PseudoSourceValue::FixedStack && \"Inconsistent memory operand in spill instruction\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1209, __extension__ __PRETTY_FUNCTION__)) |
| 1209 | "Inconsistent memory operand in spill instruction")(static_cast <bool> (PVal->kind() == PseudoSourceValue ::FixedStack && "Inconsistent memory operand in spill instruction" ) ? void (0) : __assert_fail ("PVal->kind() == PseudoSourceValue::FixedStack && \"Inconsistent memory operand in spill instruction\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1209, __extension__ __PRETTY_FUNCTION__)); |
| 1210 | int FI = cast<FixedStackPseudoSourceValue>(PVal)->getFrameIndex(); |
| 1211 | const MachineBasicBlock *MBB = MI.getParent(); |
| 1212 | Register Reg; |
| 1213 | StackOffset Offset = TFI->getFrameIndexReference(*MBB->getParent(), FI, Reg); |
| 1214 | return {Reg, Offset}; |
| 1215 | } |
| 1216 | |
| 1217 | /// Try to salvage the debug entry value if we encounter a new debug value |
| 1218 | /// describing the same parameter, otherwise stop tracking the value. Return |
| 1219 | /// true if we should stop tracking the entry value, otherwise return false. |
| 1220 | bool VarLocBasedLDV::removeEntryValue(const MachineInstr &MI, |
| 1221 | OpenRangesSet &OpenRanges, |
| 1222 | VarLocMap &VarLocIDs, |
| 1223 | const VarLoc &EntryVL) { |
| 1224 | // Skip the DBG_VALUE which is the debug entry value itself. |
| 1225 | if (MI.isIdenticalTo(EntryVL.MI)) |
| 1226 | return false; |
| 1227 | |
| 1228 | // If the parameter's location is not register location, we can not track |
| 1229 | // the entry value any more. In addition, if the debug expression from the |
| 1230 | // DBG_VALUE is not empty, we can assume the parameter's value has changed |
| 1231 | // indicating that we should stop tracking its entry value as well. |
| 1232 | if (!MI.getDebugOperand(0).isReg() || |
| 1233 | MI.getDebugExpression()->getNumElements() != 0) |
| 1234 | return true; |
| 1235 | |
| 1236 | // If the DBG_VALUE comes from a copy instruction that copies the entry value, |
| 1237 | // it means the parameter's value has not changed and we should be able to use |
| 1238 | // its entry value. |
| 1239 | Register Reg = MI.getDebugOperand(0).getReg(); |
| 1240 | auto I = std::next(MI.getReverseIterator()); |
| 1241 | const MachineOperand *SrcRegOp, *DestRegOp; |
| 1242 | if (I != MI.getParent()->rend()) { |
| 1243 | |
| 1244 | // TODO: Try to keep tracking of an entry value if we encounter a propagated |
| 1245 | // DBG_VALUE describing the copy of the entry value. (Propagated entry value |
| 1246 | // does not indicate the parameter modification.) |
| 1247 | auto DestSrc = TII->isCopyInstr(*I); |
| 1248 | if (!DestSrc) |
| 1249 | return true; |
| 1250 | |
| 1251 | SrcRegOp = DestSrc->Source; |
| 1252 | DestRegOp = DestSrc->Destination; |
| 1253 | if (Reg != DestRegOp->getReg()) |
| 1254 | return true; |
| 1255 | |
| 1256 | for (uint64_t ID : OpenRanges.getEntryValueBackupVarLocs()) { |
| 1257 | const VarLoc &VL = VarLocIDs[LocIndex::fromRawInteger(ID)]; |
| 1258 | if (VL.isEntryValueCopyBackupReg(Reg) && |
| 1259 | // Entry Values should not be variadic. |
| 1260 | VL.MI.getDebugOperand(0).getReg() == SrcRegOp->getReg()) |
| 1261 | return false; |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | return true; |
| 1266 | } |
| 1267 | |
| 1268 | /// End all previous ranges related to @MI and start a new range from @MI |
| 1269 | /// if it is a DBG_VALUE instr. |
| 1270 | void VarLocBasedLDV::transferDebugValue(const MachineInstr &MI, |
| 1271 | OpenRangesSet &OpenRanges, |
| 1272 | VarLocMap &VarLocIDs) { |
| 1273 | if (!MI.isDebugValue()) |
| 1274 | return; |
| 1275 | const DILocalVariable *Var = MI.getDebugVariable(); |
| 1276 | const DIExpression *Expr = MI.getDebugExpression(); |
| 1277 | const DILocation *DebugLoc = MI.getDebugLoc(); |
| 1278 | const DILocation *InlinedAt = DebugLoc->getInlinedAt(); |
| 1279 | assert(Var->isValidLocationForIntrinsic(DebugLoc) &&(static_cast <bool> (Var->isValidLocationForIntrinsic (DebugLoc) && "Expected inlined-at fields to agree") ? void (0) : __assert_fail ("Var->isValidLocationForIntrinsic(DebugLoc) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1280, __extension__ __PRETTY_FUNCTION__)) |
| 1280 | "Expected inlined-at fields to agree")(static_cast <bool> (Var->isValidLocationForIntrinsic (DebugLoc) && "Expected inlined-at fields to agree") ? void (0) : __assert_fail ("Var->isValidLocationForIntrinsic(DebugLoc) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1280, __extension__ __PRETTY_FUNCTION__)); |
| 1281 | |
| 1282 | DebugVariable V(Var, Expr, InlinedAt); |
| 1283 | |
| 1284 | // Check if this DBG_VALUE indicates a parameter's value changing. |
| 1285 | // If that is the case, we should stop tracking its entry value. |
| 1286 | auto EntryValBackupID = OpenRanges.getEntryValueBackup(V); |
| 1287 | if (Var->isParameter() && EntryValBackupID) { |
| 1288 | const VarLoc &EntryVL = VarLocIDs[EntryValBackupID->back()]; |
| 1289 | if (removeEntryValue(MI, OpenRanges, VarLocIDs, EntryVL)) { |
| 1290 | LLVM_DEBUG(dbgs() << "Deleting a DBG entry value because of: ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Deleting a DBG entry value because of: " ; MI.print(dbgs(), false, false, false, true, TII); } } while (false) |
| 1291 | MI.print(dbgs(), /*IsStandalone*/ false,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Deleting a DBG entry value because of: " ; MI.print(dbgs(), false, false, false, true, TII); } } while (false) |
| 1292 | /*SkipOpers*/ false, /*SkipDebugLoc*/ false,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Deleting a DBG entry value because of: " ; MI.print(dbgs(), false, false, false, true, TII); } } while (false) |
| 1293 | /*AddNewLine*/ true, TII))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Deleting a DBG entry value because of: " ; MI.print(dbgs(), false, false, false, true, TII); } } while (false); |
| 1294 | OpenRanges.erase(EntryVL); |
| 1295 | } |
| 1296 | } |
| 1297 | |
| 1298 | if (all_of(MI.debug_operands(), [](const MachineOperand &MO) { |
| 1299 | return (MO.isReg() && MO.getReg()) || MO.isImm() || MO.isFPImm() || |
| 1300 | MO.isCImm(); |
| 1301 | })) { |
| 1302 | // Use normal VarLoc constructor for registers and immediates. |
| 1303 | VarLoc VL(MI, LS); |
| 1304 | // End all previous ranges of VL.Var. |
| 1305 | OpenRanges.erase(VL); |
| 1306 | |
| 1307 | LocIndices IDs = VarLocIDs.insert(VL); |
| 1308 | // Add the VarLoc to OpenRanges from this DBG_VALUE. |
| 1309 | OpenRanges.insert(IDs, VL); |
| 1310 | } else if (MI.memoperands().size() > 0) { |
| 1311 | llvm_unreachable("DBG_VALUE with mem operand encountered after regalloc?")::llvm::llvm_unreachable_internal("DBG_VALUE with mem operand encountered after regalloc?" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1311); |
| 1312 | } else { |
| 1313 | // This must be an undefined location. If it has an open range, erase it. |
| 1314 | assert(MI.isUndefDebugValue() &&(static_cast <bool> (MI.isUndefDebugValue() && "Unexpected non-undef DBG_VALUE encountered" ) ? void (0) : __assert_fail ("MI.isUndefDebugValue() && \"Unexpected non-undef DBG_VALUE encountered\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1315, __extension__ __PRETTY_FUNCTION__)) |
| 1315 | "Unexpected non-undef DBG_VALUE encountered")(static_cast <bool> (MI.isUndefDebugValue() && "Unexpected non-undef DBG_VALUE encountered" ) ? void (0) : __assert_fail ("MI.isUndefDebugValue() && \"Unexpected non-undef DBG_VALUE encountered\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1315, __extension__ __PRETTY_FUNCTION__)); |
| 1316 | VarLoc VL(MI, LS); |
| 1317 | OpenRanges.erase(VL); |
| 1318 | } |
| 1319 | } |
| 1320 | |
| 1321 | // This should be removed later, doesn't fit the new design. |
| 1322 | void VarLocBasedLDV::collectAllVarLocs(SmallVectorImpl<VarLoc> &Collected, |
| 1323 | const VarLocSet &CollectFrom, |
| 1324 | const VarLocMap &VarLocIDs) { |
| 1325 | // The half-open interval [FirstIndexForReg, FirstInvalidIndex) contains all |
| 1326 | // possible VarLoc IDs for VarLocs with MLs of kind RegisterKind which live |
| 1327 | // in Reg. |
| 1328 | uint64_t FirstIndex = LocIndex::rawIndexForReg(LocIndex::kUniversalLocation); |
| 1329 | uint64_t FirstInvalidIndex = |
| 1330 | LocIndex::rawIndexForReg(LocIndex::kUniversalLocation + 1); |
| 1331 | // Iterate through that half-open interval and collect all the set IDs. |
| 1332 | for (auto It = CollectFrom.find(FirstIndex), End = CollectFrom.end(); |
| 1333 | It != End && *It < FirstInvalidIndex; ++It) { |
| 1334 | LocIndex RegIdx = LocIndex::fromRawInteger(*It); |
| 1335 | Collected.push_back(VarLocIDs[RegIdx]); |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | /// Turn the entry value backup locations into primary locations. |
| 1340 | void VarLocBasedLDV::emitEntryValues(MachineInstr &MI, |
| 1341 | OpenRangesSet &OpenRanges, |
| 1342 | VarLocMap &VarLocIDs, |
| 1343 | TransferMap &Transfers, |
| 1344 | VarLocsInRange &KillSet) { |
| 1345 | // Do not insert entry value locations after a terminator. |
| 1346 | if (MI.isTerminator()) |
| 1347 | return; |
| 1348 | |
| 1349 | for (uint32_t ID : KillSet) { |
| 1350 | // The KillSet IDs are indices for the universal location bucket. |
| 1351 | LocIndex Idx = LocIndex(LocIndex::kUniversalLocation, ID); |
| 1352 | const VarLoc &VL = VarLocIDs[Idx]; |
| 1353 | if (!VL.Var.getVariable()->isParameter()) |
| 1354 | continue; |
| 1355 | |
| 1356 | auto DebugVar = VL.Var; |
| 1357 | Optional<LocIndices> EntryValBackupIDs = |
| 1358 | OpenRanges.getEntryValueBackup(DebugVar); |
| 1359 | |
| 1360 | // If the parameter has the entry value backup, it means we should |
| 1361 | // be able to use its entry value. |
| 1362 | if (!EntryValBackupIDs) |
| 1363 | continue; |
| 1364 | |
| 1365 | const VarLoc &EntryVL = VarLocIDs[EntryValBackupIDs->back()]; |
| 1366 | VarLoc EntryLoc = VarLoc::CreateEntryLoc(EntryVL.MI, LS, EntryVL.Expr, |
| 1367 | EntryVL.Locs[0].Value.RegNo); |
| 1368 | LocIndices EntryValueIDs = VarLocIDs.insert(EntryLoc); |
| 1369 | Transfers.push_back({&MI, EntryValueIDs.back()}); |
| 1370 | OpenRanges.insert(EntryValueIDs, EntryLoc); |
| 1371 | } |
| 1372 | } |
| 1373 | |
| 1374 | /// Create new TransferDebugPair and insert it in \p Transfers. The VarLoc |
| 1375 | /// with \p OldVarID should be deleted form \p OpenRanges and replaced with |
| 1376 | /// new VarLoc. If \p NewReg is different than default zero value then the |
| 1377 | /// new location will be register location created by the copy like instruction, |
| 1378 | /// otherwise it is variable's location on the stack. |
| 1379 | void VarLocBasedLDV::insertTransferDebugPair( |
| 1380 | MachineInstr &MI, OpenRangesSet &OpenRanges, TransferMap &Transfers, |
| 1381 | VarLocMap &VarLocIDs, LocIndex OldVarID, TransferKind Kind, |
| 1382 | const VarLoc::MachineLoc &OldLoc, Register NewReg) { |
| 1383 | const VarLoc &OldVarLoc = VarLocIDs[OldVarID]; |
| 1384 | |
| 1385 | auto ProcessVarLoc = [&MI, &OpenRanges, &Transfers, &VarLocIDs](VarLoc &VL) { |
| 1386 | LocIndices LocIds = VarLocIDs.insert(VL); |
| 1387 | |
| 1388 | // Close this variable's previous location range. |
| 1389 | OpenRanges.erase(VL); |
| 1390 | |
| 1391 | // Record the new location as an open range, and a postponed transfer |
| 1392 | // inserting a DBG_VALUE for this location. |
| 1393 | OpenRanges.insert(LocIds, VL); |
| 1394 | assert(!MI.isTerminator() && "Cannot insert DBG_VALUE after terminator")(static_cast <bool> (!MI.isTerminator() && "Cannot insert DBG_VALUE after terminator" ) ? void (0) : __assert_fail ("!MI.isTerminator() && \"Cannot insert DBG_VALUE after terminator\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1394, __extension__ __PRETTY_FUNCTION__)); |
| 1395 | TransferDebugPair MIP = {&MI, LocIds.back()}; |
| 1396 | Transfers.push_back(MIP); |
| 1397 | }; |
| 1398 | |
| 1399 | // End all previous ranges of VL.Var. |
| 1400 | OpenRanges.erase(VarLocIDs[OldVarID]); |
| 1401 | switch (Kind) { |
| 1402 | case TransferKind::TransferCopy: { |
| 1403 | assert(NewReg &&(static_cast <bool> (NewReg && "No register supplied when handling a copy of a debug value" ) ? void (0) : __assert_fail ("NewReg && \"No register supplied when handling a copy of a debug value\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1404, __extension__ __PRETTY_FUNCTION__)) |
| 1404 | "No register supplied when handling a copy of a debug value")(static_cast <bool> (NewReg && "No register supplied when handling a copy of a debug value" ) ? void (0) : __assert_fail ("NewReg && \"No register supplied when handling a copy of a debug value\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1404, __extension__ __PRETTY_FUNCTION__)); |
| 1405 | // Create a DBG_VALUE instruction to describe the Var in its new |
| 1406 | // register location. |
| 1407 | VarLoc VL = VarLoc::CreateCopyLoc(OldVarLoc, OldLoc, NewReg); |
| 1408 | ProcessVarLoc(VL); |
| 1409 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
| 1410 | dbgs() << "Creating VarLoc for register copy:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
| 1411 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
| 1412 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false); |
| 1413 | return; |
| 1414 | } |
| 1415 | case TransferKind::TransferSpill: { |
| 1416 | // Create a DBG_VALUE instruction to describe the Var in its spilled |
| 1417 | // location. |
| 1418 | VarLoc::SpillLoc SpillLocation = extractSpillBaseRegAndOffset(MI); |
| 1419 | VarLoc VL = VarLoc::CreateSpillLoc( |
| 1420 | OldVarLoc, OldLoc, SpillLocation.SpillBase, SpillLocation.SpillOffset); |
| 1421 | ProcessVarLoc(VL); |
| 1422 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
| 1423 | dbgs() << "Creating VarLoc for spill:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
| 1424 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
| 1425 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false); |
| 1426 | return; |
| 1427 | } |
| 1428 | case TransferKind::TransferRestore: { |
| 1429 | assert(NewReg &&(static_cast <bool> (NewReg && "No register supplied when handling a restore of a debug value" ) ? void (0) : __assert_fail ("NewReg && \"No register supplied when handling a restore of a debug value\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1430, __extension__ __PRETTY_FUNCTION__)) |
| 1430 | "No register supplied when handling a restore of a debug value")(static_cast <bool> (NewReg && "No register supplied when handling a restore of a debug value" ) ? void (0) : __assert_fail ("NewReg && \"No register supplied when handling a restore of a debug value\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1430, __extension__ __PRETTY_FUNCTION__)); |
| 1431 | // DebugInstr refers to the pre-spill location, therefore we can reuse |
| 1432 | // its expression. |
| 1433 | VarLoc VL = VarLoc::CreateCopyLoc(OldVarLoc, OldLoc, NewReg); |
| 1434 | ProcessVarLoc(VL); |
| 1435 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
| 1436 | dbgs() << "Creating VarLoc for restore:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
| 1437 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
| 1438 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false); |
| 1439 | return; |
| 1440 | } |
| 1441 | } |
| 1442 | llvm_unreachable("Invalid transfer kind")::llvm::llvm_unreachable_internal("Invalid transfer kind", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1442); |
| 1443 | } |
| 1444 | |
| 1445 | /// A definition of a register may mark the end of a range. |
| 1446 | void VarLocBasedLDV::transferRegisterDef( |
| 1447 | MachineInstr &MI, OpenRangesSet &OpenRanges, VarLocMap &VarLocIDs, |
| 1448 | TransferMap &Transfers) { |
| 1449 | |
| 1450 | // Meta Instructions do not affect the debug liveness of any register they |
| 1451 | // define. |
| 1452 | if (MI.isMetaInstruction()) |
| 1453 | return; |
| 1454 | |
| 1455 | MachineFunction *MF = MI.getMF(); |
| 1456 | const TargetLowering *TLI = MF->getSubtarget().getTargetLowering(); |
| 1457 | Register SP = TLI->getStackPointerRegisterToSaveRestore(); |
| 1458 | |
| 1459 | // Find the regs killed by MI, and find regmasks of preserved regs. |
| 1460 | DefinedRegsSet DeadRegs; |
| 1461 | SmallVector<const uint32_t *, 4> RegMasks; |
| 1462 | for (const MachineOperand &MO : MI.operands()) { |
| 1463 | // Determine whether the operand is a register def. |
| 1464 | if (MO.isReg() && MO.isDef() && MO.getReg() && |
| 1465 | Register::isPhysicalRegister(MO.getReg()) && |
| 1466 | !(MI.isCall() && MO.getReg() == SP)) { |
| 1467 | // Remove ranges of all aliased registers. |
| 1468 | for (MCRegAliasIterator RAI(MO.getReg(), TRI, true); RAI.isValid(); ++RAI) |
| 1469 | // FIXME: Can we break out of this loop early if no insertion occurs? |
| 1470 | DeadRegs.insert(*RAI); |
| 1471 | } else if (MO.isRegMask()) { |
| 1472 | RegMasks.push_back(MO.getRegMask()); |
| 1473 | } |
| 1474 | } |
| 1475 | |
| 1476 | // Erase VarLocs which reside in one of the dead registers. For performance |
| 1477 | // reasons, it's critical to not iterate over the full set of open VarLocs. |
| 1478 | // Iterate over the set of dying/used regs instead. |
| 1479 | if (!RegMasks.empty()) { |
| 1480 | SmallVector<Register, 32> UsedRegs; |
| 1481 | getUsedRegs(OpenRanges.getVarLocs(), UsedRegs); |
| 1482 | for (Register Reg : UsedRegs) { |
| 1483 | // Remove ranges of all clobbered registers. Register masks don't usually |
| 1484 | // list SP as preserved. Assume that call instructions never clobber SP, |
| 1485 | // because some backends (e.g., AArch64) never list SP in the regmask. |
| 1486 | // While the debug info may be off for an instruction or two around |
| 1487 | // callee-cleanup calls, transferring the DEBUG_VALUE across the call is |
| 1488 | // still a better user experience. |
| 1489 | if (Reg == SP) |
| 1490 | continue; |
| 1491 | bool AnyRegMaskKillsReg = |
| 1492 | any_of(RegMasks, [Reg](const uint32_t *RegMask) { |
| 1493 | return MachineOperand::clobbersPhysReg(RegMask, Reg); |
| 1494 | }); |
| 1495 | if (AnyRegMaskKillsReg) |
| 1496 | DeadRegs.insert(Reg); |
| 1497 | } |
| 1498 | } |
| 1499 | |
| 1500 | if (DeadRegs.empty()) |
| 1501 | return; |
| 1502 | |
| 1503 | VarLocsInRange KillSet; |
| 1504 | collectIDsForRegs(KillSet, DeadRegs, OpenRanges.getVarLocs(), VarLocIDs); |
| 1505 | OpenRanges.erase(KillSet, VarLocIDs, LocIndex::kUniversalLocation); |
| 1506 | |
| 1507 | if (TPC) { |
| 1508 | auto &TM = TPC->getTM<TargetMachine>(); |
| 1509 | if (TM.Options.ShouldEmitDebugEntryValues()) |
| 1510 | emitEntryValues(MI, OpenRanges, VarLocIDs, Transfers, KillSet); |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | bool VarLocBasedLDV::isSpillInstruction(const MachineInstr &MI, |
| 1515 | MachineFunction *MF) { |
| 1516 | // TODO: Handle multiple stores folded into one. |
| 1517 | if (!MI.hasOneMemOperand()) |
| 1518 | return false; |
| 1519 | |
| 1520 | if (!MI.getSpillSize(TII) && !MI.getFoldedSpillSize(TII)) |
| 1521 | return false; // This is not a spill instruction, since no valid size was |
| 1522 | // returned from either function. |
| 1523 | |
| 1524 | return true; |
| 1525 | } |
| 1526 | |
| 1527 | bool VarLocBasedLDV::isLocationSpill(const MachineInstr &MI, |
| 1528 | MachineFunction *MF, Register &Reg) { |
| 1529 | if (!isSpillInstruction(MI, MF)) |
| 1530 | return false; |
| 1531 | |
| 1532 | auto isKilledReg = [&](const MachineOperand MO, Register &Reg) { |
| 1533 | if (!MO.isReg() || !MO.isUse()) { |
| 1534 | Reg = 0; |
| 1535 | return false; |
| 1536 | } |
| 1537 | Reg = MO.getReg(); |
| 1538 | return MO.isKill(); |
| 1539 | }; |
| 1540 | |
| 1541 | for (const MachineOperand &MO : MI.operands()) { |
| 1542 | // In a spill instruction generated by the InlineSpiller the spilled |
| 1543 | // register has its kill flag set. |
| 1544 | if (isKilledReg(MO, Reg)) |
| 1545 | return true; |
| 1546 | if (Reg != 0) { |
| 1547 | // Check whether next instruction kills the spilled register. |
| 1548 | // FIXME: Current solution does not cover search for killed register in |
| 1549 | // bundles and instructions further down the chain. |
| 1550 | auto NextI = std::next(MI.getIterator()); |
| 1551 | // Skip next instruction that points to basic block end iterator. |
| 1552 | if (MI.getParent()->end() == NextI) |
| 1553 | continue; |
| 1554 | Register RegNext; |
| 1555 | for (const MachineOperand &MONext : NextI->operands()) { |
| 1556 | // Return true if we came across the register from the |
| 1557 | // previous spill instruction that is killed in NextI. |
| 1558 | if (isKilledReg(MONext, RegNext) && RegNext == Reg) |
| 1559 | return true; |
| 1560 | } |
| 1561 | } |
| 1562 | } |
| 1563 | // Return false if we didn't find spilled register. |
| 1564 | return false; |
| 1565 | } |
| 1566 | |
| 1567 | Optional<VarLocBasedLDV::VarLoc::SpillLoc> |
| 1568 | VarLocBasedLDV::isRestoreInstruction(const MachineInstr &MI, |
| 1569 | MachineFunction *MF, Register &Reg) { |
| 1570 | if (!MI.hasOneMemOperand()) |
| 1571 | return None; |
| 1572 | |
| 1573 | // FIXME: Handle folded restore instructions with more than one memory |
| 1574 | // operand. |
| 1575 | if (MI.getRestoreSize(TII)) { |
| 1576 | Reg = MI.getOperand(0).getReg(); |
| 1577 | return extractSpillBaseRegAndOffset(MI); |
| 1578 | } |
| 1579 | return None; |
| 1580 | } |
| 1581 | |
| 1582 | /// A spilled register may indicate that we have to end the current range of |
| 1583 | /// a variable and create a new one for the spill location. |
| 1584 | /// A restored register may indicate the reverse situation. |
| 1585 | /// We don't want to insert any instructions in process(), so we just create |
| 1586 | /// the DBG_VALUE without inserting it and keep track of it in \p Transfers. |
| 1587 | /// It will be inserted into the BB when we're done iterating over the |
| 1588 | /// instructions. |
| 1589 | void VarLocBasedLDV::transferSpillOrRestoreInst(MachineInstr &MI, |
| 1590 | OpenRangesSet &OpenRanges, |
| 1591 | VarLocMap &VarLocIDs, |
| 1592 | TransferMap &Transfers) { |
| 1593 | MachineFunction *MF = MI.getMF(); |
| 1594 | TransferKind TKind; |
| 1595 | Register Reg; |
| 1596 | Optional<VarLoc::SpillLoc> Loc; |
| 1597 | |
| 1598 | LLVM_DEBUG(dbgs() << "Examining instruction: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Examining instruction: " ; MI.dump();; } } while (false); |
| 1599 | |
| 1600 | // First, if there are any DBG_VALUEs pointing at a spill slot that is |
| 1601 | // written to, then close the variable location. The value in memory |
| 1602 | // will have changed. |
| 1603 | VarLocsInRange KillSet; |
| 1604 | if (isSpillInstruction(MI, MF)) { |
| 1605 | Loc = extractSpillBaseRegAndOffset(MI); |
| 1606 | for (uint64_t ID : OpenRanges.getSpillVarLocs()) { |
| 1607 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1608 | const VarLoc &VL = VarLocIDs[Idx]; |
| 1609 | assert(VL.containsSpillLocs() && "Broken VarLocSet?")(static_cast <bool> (VL.containsSpillLocs() && "Broken VarLocSet?" ) ? void (0) : __assert_fail ("VL.containsSpillLocs() && \"Broken VarLocSet?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1609, __extension__ __PRETTY_FUNCTION__)); |
| 1610 | if (VL.usesSpillLoc(*Loc)) { |
| 1611 | // This location is overwritten by the current instruction -- terminate |
| 1612 | // the open range, and insert an explicit DBG_VALUE $noreg. |
| 1613 | // |
| 1614 | // Doing this at a later stage would require re-interpreting all |
| 1615 | // DBG_VALUes and DIExpressions to identify whether they point at |
| 1616 | // memory, and then analysing all memory writes to see if they |
| 1617 | // overwrite that memory, which is expensive. |
| 1618 | // |
| 1619 | // At this stage, we already know which DBG_VALUEs are for spills and |
| 1620 | // where they are located; it's best to fix handle overwrites now. |
| 1621 | KillSet.insert(ID); |
| 1622 | unsigned SpillLocIdx = VL.getSpillLocIdx(*Loc); |
| 1623 | VarLoc::MachineLoc OldLoc = VL.Locs[SpillLocIdx]; |
| 1624 | VarLoc UndefVL = VarLoc::CreateCopyLoc(VL, OldLoc, 0); |
| 1625 | LocIndices UndefLocIDs = VarLocIDs.insert(UndefVL); |
| 1626 | Transfers.push_back({&MI, UndefLocIDs.back()}); |
| 1627 | } |
| 1628 | } |
| 1629 | OpenRanges.erase(KillSet, VarLocIDs, LocIndex::kSpillLocation); |
| 1630 | } |
| 1631 | |
| 1632 | // Try to recognise spill and restore instructions that may create a new |
| 1633 | // variable location. |
| 1634 | if (isLocationSpill(MI, MF, Reg)) { |
| 1635 | TKind = TransferKind::TransferSpill; |
| 1636 | LLVM_DEBUG(dbgs() << "Recognized as spill: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Recognized as spill: " ; MI.dump();; } } while (false); |
| 1637 | LLVM_DEBUG(dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false) |
| 1638 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false); |
| 1639 | } else { |
| 1640 | if (!(Loc = isRestoreInstruction(MI, MF, Reg))) |
| 1641 | return; |
| 1642 | TKind = TransferKind::TransferRestore; |
| 1643 | LLVM_DEBUG(dbgs() << "Recognized as restore: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Recognized as restore: " ; MI.dump();; } } while (false); |
| 1644 | LLVM_DEBUG(dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false) |
| 1645 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false); |
| 1646 | } |
| 1647 | // Check if the register or spill location is the location of a debug value. |
| 1648 | auto TransferCandidates = OpenRanges.getEmptyVarLocRange(); |
| 1649 | if (TKind == TransferKind::TransferSpill) |
| 1650 | TransferCandidates = OpenRanges.getRegisterVarLocs(Reg); |
| 1651 | else if (TKind == TransferKind::TransferRestore) |
| 1652 | TransferCandidates = OpenRanges.getSpillVarLocs(); |
| 1653 | for (uint64_t ID : TransferCandidates) { |
| 1654 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1655 | const VarLoc &VL = VarLocIDs[Idx]; |
| 1656 | unsigned LocIdx; |
| 1657 | if (TKind == TransferKind::TransferSpill) { |
| 1658 | assert(VL.usesReg(Reg) && "Broken VarLocSet?")(static_cast <bool> (VL.usesReg(Reg) && "Broken VarLocSet?" ) ? void (0) : __assert_fail ("VL.usesReg(Reg) && \"Broken VarLocSet?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1658, __extension__ __PRETTY_FUNCTION__)); |
| 1659 | LLVM_DEBUG(dbgs() << "Spilling Register " << printReg(Reg, TRI) << '('do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Spilling Register " << printReg(Reg, TRI) << '(' << VL.Var.getVariable( )->getName() << ")\n"; } } while (false) |
| 1660 | << VL.Var.getVariable()->getName() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Spilling Register " << printReg(Reg, TRI) << '(' << VL.Var.getVariable( )->getName() << ")\n"; } } while (false); |
| 1661 | LocIdx = VL.getRegIdx(Reg); |
| 1662 | } else { |
| 1663 | assert(TKind == TransferKind::TransferRestore && VL.containsSpillLocs() &&(static_cast <bool> (TKind == TransferKind::TransferRestore && VL.containsSpillLocs() && "Broken VarLocSet?" ) ? void (0) : __assert_fail ("TKind == TransferKind::TransferRestore && VL.containsSpillLocs() && \"Broken VarLocSet?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1664, __extension__ __PRETTY_FUNCTION__)) |
| 1664 | "Broken VarLocSet?")(static_cast <bool> (TKind == TransferKind::TransferRestore && VL.containsSpillLocs() && "Broken VarLocSet?" ) ? void (0) : __assert_fail ("TKind == TransferKind::TransferRestore && VL.containsSpillLocs() && \"Broken VarLocSet?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1664, __extension__ __PRETTY_FUNCTION__)); |
| 1665 | if (!VL.usesSpillLoc(*Loc)) |
| 1666 | // The spill location is not the location of a debug value. |
| 1667 | continue; |
| 1668 | LLVM_DEBUG(dbgs() << "Restoring Register " << printReg(Reg, TRI) << '('do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Restoring Register " << printReg(Reg, TRI) << '(' << VL.Var.getVariable( )->getName() << ")\n"; } } while (false) |
| 1669 | << VL.Var.getVariable()->getName() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Restoring Register " << printReg(Reg, TRI) << '(' << VL.Var.getVariable( )->getName() << ")\n"; } } while (false); |
| 1670 | LocIdx = VL.getSpillLocIdx(*Loc); |
| 1671 | } |
| 1672 | VarLoc::MachineLoc MLoc = VL.Locs[LocIdx]; |
| 1673 | insertTransferDebugPair(MI, OpenRanges, Transfers, VarLocIDs, Idx, TKind, |
| 1674 | MLoc, Reg); |
| 1675 | // FIXME: A comment should explain why it's correct to return early here, |
| 1676 | // if that is in fact correct. |
| 1677 | return; |
| 1678 | } |
| 1679 | } |
| 1680 | |
| 1681 | /// If \p MI is a register copy instruction, that copies a previously tracked |
| 1682 | /// value from one register to another register that is callee saved, we |
| 1683 | /// create new DBG_VALUE instruction described with copy destination register. |
| 1684 | void VarLocBasedLDV::transferRegisterCopy(MachineInstr &MI, |
| 1685 | OpenRangesSet &OpenRanges, |
| 1686 | VarLocMap &VarLocIDs, |
| 1687 | TransferMap &Transfers) { |
| 1688 | auto DestSrc = TII->isCopyInstr(MI); |
| 1689 | if (!DestSrc) |
| 1690 | return; |
| 1691 | |
| 1692 | const MachineOperand *DestRegOp = DestSrc->Destination; |
| 1693 | const MachineOperand *SrcRegOp = DestSrc->Source; |
| 1694 | |
| 1695 | if (!DestRegOp->isDef()) |
| 1696 | return; |
| 1697 | |
| 1698 | auto isCalleeSavedReg = [&](Register Reg) { |
| 1699 | for (MCRegAliasIterator RAI(Reg, TRI, true); RAI.isValid(); ++RAI) |
| 1700 | if (CalleeSavedRegs.test(*RAI)) |
| 1701 | return true; |
| 1702 | return false; |
| 1703 | }; |
| 1704 | |
| 1705 | Register SrcReg = SrcRegOp->getReg(); |
| 1706 | Register DestReg = DestRegOp->getReg(); |
| 1707 | |
| 1708 | // We want to recognize instructions where destination register is callee |
| 1709 | // saved register. If register that could be clobbered by the call is |
| 1710 | // included, there would be a great chance that it is going to be clobbered |
| 1711 | // soon. It is more likely that previous register location, which is callee |
| 1712 | // saved, is going to stay unclobbered longer, even if it is killed. |
| 1713 | if (!isCalleeSavedReg(DestReg)) |
| 1714 | return; |
| 1715 | |
| 1716 | // Remember an entry value movement. If we encounter a new debug value of |
| 1717 | // a parameter describing only a moving of the value around, rather then |
| 1718 | // modifying it, we are still able to use the entry value if needed. |
| 1719 | if (isRegOtherThanSPAndFP(*DestRegOp, MI, TRI)) { |
| 1720 | for (uint64_t ID : OpenRanges.getEntryValueBackupVarLocs()) { |
| 1721 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1722 | const VarLoc &VL = VarLocIDs[Idx]; |
| 1723 | if (VL.isEntryValueBackupReg(SrcReg)) { |
| 1724 | LLVM_DEBUG(dbgs() << "Copy of the entry value: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Copy of the entry value: " ; MI.dump();; } } while (false); |
| 1725 | VarLoc EntryValLocCopyBackup = |
| 1726 | VarLoc::CreateEntryCopyBackupLoc(VL.MI, LS, VL.Expr, DestReg); |
| 1727 | // Stop tracking the original entry value. |
| 1728 | OpenRanges.erase(VL); |
| 1729 | |
| 1730 | // Start tracking the entry value copy. |
| 1731 | LocIndices EntryValCopyLocIDs = VarLocIDs.insert(EntryValLocCopyBackup); |
| 1732 | OpenRanges.insert(EntryValCopyLocIDs, EntryValLocCopyBackup); |
| 1733 | break; |
| 1734 | } |
| 1735 | } |
| 1736 | } |
| 1737 | |
| 1738 | if (!SrcRegOp->isKill()) |
| 1739 | return; |
| 1740 | |
| 1741 | for (uint64_t ID : OpenRanges.getRegisterVarLocs(SrcReg)) { |
| 1742 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1743 | assert(VarLocIDs[Idx].usesReg(SrcReg) && "Broken VarLocSet?")(static_cast <bool> (VarLocIDs[Idx].usesReg(SrcReg) && "Broken VarLocSet?") ? void (0) : __assert_fail ("VarLocIDs[Idx].usesReg(SrcReg) && \"Broken VarLocSet?\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1743, __extension__ __PRETTY_FUNCTION__)); |
| 1744 | VarLoc::MachineLocValue Loc; |
| 1745 | Loc.RegNo = SrcReg; |
| 1746 | VarLoc::MachineLoc MLoc{VarLoc::MachineLocKind::RegisterKind, Loc}; |
| 1747 | insertTransferDebugPair(MI, OpenRanges, Transfers, VarLocIDs, Idx, |
| 1748 | TransferKind::TransferCopy, MLoc, DestReg); |
| 1749 | // FIXME: A comment should explain why it's correct to return early here, |
| 1750 | // if that is in fact correct. |
| 1751 | return; |
| 1752 | } |
| 1753 | } |
| 1754 | |
| 1755 | /// Terminate all open ranges at the end of the current basic block. |
| 1756 | bool VarLocBasedLDV::transferTerminator(MachineBasicBlock *CurMBB, |
| 1757 | OpenRangesSet &OpenRanges, |
| 1758 | VarLocInMBB &OutLocs, |
| 1759 | const VarLocMap &VarLocIDs) { |
| 1760 | bool Changed = false; |
| 1761 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1762 | VarVec VarLocs;do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1763 | OpenRanges.getUniqueVarLocs(VarLocs, VarLocIDs);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1764 | for (VarLoc &VL : VarLocs) {do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1765 | // Copy OpenRanges to OutLocs, if not already present.do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1766 | dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber() << ": ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1767 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1768 | }do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false) |
| 1769 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { VarVec VarLocs; OpenRanges.getUniqueVarLocs (VarLocs, VarLocIDs); for (VarLoc &VL : VarLocs) { dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber () << ": "; VL.dump(TRI); } }; } } while (false); |
| 1770 | VarLocSet &VLS = getVarLocsInMBB(CurMBB, OutLocs); |
| 1771 | Changed = VLS != OpenRanges.getVarLocs(); |
| 1772 | // New OutLocs set may be different due to spill, restore or register |
| 1773 | // copy instruction processing. |
| 1774 | if (Changed) |
| 1775 | VLS = OpenRanges.getVarLocs(); |
| 1776 | OpenRanges.clear(); |
| 1777 | return Changed; |
| 1778 | } |
| 1779 | |
| 1780 | /// Accumulate a mapping between each DILocalVariable fragment and other |
| 1781 | /// fragments of that DILocalVariable which overlap. This reduces work during |
| 1782 | /// the data-flow stage from "Find any overlapping fragments" to "Check if the |
| 1783 | /// known-to-overlap fragments are present". |
| 1784 | /// \param MI A previously unprocessed DEBUG_VALUE instruction to analyze for |
| 1785 | /// fragment usage. |
| 1786 | /// \param SeenFragments Map from DILocalVariable to all fragments of that |
| 1787 | /// Variable which are known to exist. |
| 1788 | /// \param OverlappingFragments The overlap map being constructed, from one |
| 1789 | /// Var/Fragment pair to a vector of fragments known to overlap. |
| 1790 | void VarLocBasedLDV::accumulateFragmentMap(MachineInstr &MI, |
| 1791 | VarToFragments &SeenFragments, |
| 1792 | OverlapMap &OverlappingFragments) { |
| 1793 | DebugVariable MIVar(MI.getDebugVariable(), MI.getDebugExpression(), |
| 1794 | MI.getDebugLoc()->getInlinedAt()); |
| 1795 | FragmentInfo ThisFragment = MIVar.getFragmentOrDefault(); |
| 1796 | |
| 1797 | // If this is the first sighting of this variable, then we are guaranteed |
| 1798 | // there are currently no overlapping fragments either. Initialize the set |
| 1799 | // of seen fragments, record no overlaps for the current one, and return. |
| 1800 | auto SeenIt = SeenFragments.find(MIVar.getVariable()); |
| 1801 | if (SeenIt == SeenFragments.end()) { |
| 1802 | SmallSet<FragmentInfo, 4> OneFragment; |
| 1803 | OneFragment.insert(ThisFragment); |
| 1804 | SeenFragments.insert({MIVar.getVariable(), OneFragment}); |
| 1805 | |
| 1806 | OverlappingFragments.insert({{MIVar.getVariable(), ThisFragment}, {}}); |
| 1807 | return; |
| 1808 | } |
| 1809 | |
| 1810 | // If this particular Variable/Fragment pair already exists in the overlap |
| 1811 | // map, it has already been accounted for. |
| 1812 | auto IsInOLapMap = |
| 1813 | OverlappingFragments.insert({{MIVar.getVariable(), ThisFragment}, {}}); |
| 1814 | if (!IsInOLapMap.second) |
| 1815 | return; |
| 1816 | |
| 1817 | auto &ThisFragmentsOverlaps = IsInOLapMap.first->second; |
| 1818 | auto &AllSeenFragments = SeenIt->second; |
| 1819 | |
| 1820 | // Otherwise, examine all other seen fragments for this variable, with "this" |
| 1821 | // fragment being a previously unseen fragment. Record any pair of |
| 1822 | // overlapping fragments. |
| 1823 | for (auto &ASeenFragment : AllSeenFragments) { |
| 1824 | // Does this previously seen fragment overlap? |
| 1825 | if (DIExpression::fragmentsOverlap(ThisFragment, ASeenFragment)) { |
| 1826 | // Yes: Mark the current fragment as being overlapped. |
| 1827 | ThisFragmentsOverlaps.push_back(ASeenFragment); |
| 1828 | // Mark the previously seen fragment as being overlapped by the current |
| 1829 | // one. |
| 1830 | auto ASeenFragmentsOverlaps = |
| 1831 | OverlappingFragments.find({MIVar.getVariable(), ASeenFragment}); |
| 1832 | assert(ASeenFragmentsOverlaps != OverlappingFragments.end() &&(static_cast <bool> (ASeenFragmentsOverlaps != OverlappingFragments .end() && "Previously seen var fragment has no vector of overlaps" ) ? void (0) : __assert_fail ("ASeenFragmentsOverlaps != OverlappingFragments.end() && \"Previously seen var fragment has no vector of overlaps\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1833, __extension__ __PRETTY_FUNCTION__)) |
| 1833 | "Previously seen var fragment has no vector of overlaps")(static_cast <bool> (ASeenFragmentsOverlaps != OverlappingFragments .end() && "Previously seen var fragment has no vector of overlaps" ) ? void (0) : __assert_fail ("ASeenFragmentsOverlaps != OverlappingFragments.end() && \"Previously seen var fragment has no vector of overlaps\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1833, __extension__ __PRETTY_FUNCTION__)); |
| 1834 | ASeenFragmentsOverlaps->second.push_back(ThisFragment); |
| 1835 | } |
| 1836 | } |
| 1837 | |
| 1838 | AllSeenFragments.insert(ThisFragment); |
| 1839 | } |
| 1840 | |
| 1841 | /// This routine creates OpenRanges. |
| 1842 | void VarLocBasedLDV::process(MachineInstr &MI, OpenRangesSet &OpenRanges, |
| 1843 | VarLocMap &VarLocIDs, TransferMap &Transfers) { |
| 1844 | transferDebugValue(MI, OpenRanges, VarLocIDs); |
| 1845 | transferRegisterDef(MI, OpenRanges, VarLocIDs, Transfers); |
| 1846 | transferRegisterCopy(MI, OpenRanges, VarLocIDs, Transfers); |
| 1847 | transferSpillOrRestoreInst(MI, OpenRanges, VarLocIDs, Transfers); |
| 1848 | } |
| 1849 | |
| 1850 | /// This routine joins the analysis results of all incoming edges in @MBB by |
| 1851 | /// inserting a new DBG_VALUE instruction at the start of the @MBB - if the same |
| 1852 | /// source variable in all the predecessors of @MBB reside in the same location. |
| 1853 | bool VarLocBasedLDV::join( |
| 1854 | MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs, |
| 1855 | const VarLocMap &VarLocIDs, |
| 1856 | SmallPtrSet<const MachineBasicBlock *, 16> &Visited, |
| 1857 | SmallPtrSetImpl<const MachineBasicBlock *> &ArtificialBlocks) { |
| 1858 | LLVM_DEBUG(dbgs() << "join MBB: " << MBB.getNumber() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "join MBB: " << MBB .getNumber() << "\n"; } } while (false); |
| 1859 | |
| 1860 | VarLocSet InLocsT(Alloc); // Temporary incoming locations. |
| 1861 | |
| 1862 | // For all predecessors of this MBB, find the set of VarLocs that |
| 1863 | // can be joined. |
| 1864 | int NumVisited = 0; |
| 1865 | for (auto p : MBB.predecessors()) { |
| 1866 | // Ignore backedges if we have not visited the predecessor yet. As the |
| 1867 | // predecessor hasn't yet had locations propagated into it, most locations |
| 1868 | // will not yet be valid, so treat them as all being uninitialized and |
| 1869 | // potentially valid. If a location guessed to be correct here is |
| 1870 | // invalidated later, we will remove it when we revisit this block. |
| 1871 | if (!Visited.count(p)) { |
| 1872 | LLVM_DEBUG(dbgs() << " ignoring unvisited pred MBB: " << p->getNumber()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << " ignoring unvisited pred MBB: " << p->getNumber() << "\n"; } } while (false) |
| 1873 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << " ignoring unvisited pred MBB: " << p->getNumber() << "\n"; } } while (false); |
| 1874 | continue; |
| 1875 | } |
| 1876 | auto OL = OutLocs.find(p); |
| 1877 | // Join is null in case of empty OutLocs from any of the pred. |
| 1878 | if (OL == OutLocs.end()) |
| 1879 | return false; |
| 1880 | |
| 1881 | // Just copy over the Out locs to incoming locs for the first visited |
| 1882 | // predecessor, and for all other predecessors join the Out locs. |
| 1883 | VarLocSet &OutLocVLS = *OL->second.get(); |
| 1884 | if (!NumVisited) |
| 1885 | InLocsT = OutLocVLS; |
| 1886 | else |
| 1887 | InLocsT &= OutLocVLS; |
| 1888 | |
| 1889 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1890 | if (!InLocsT.empty()) {do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1891 | VarVec VarLocs;do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1892 | collectAllVarLocs(VarLocs, InLocsT, VarLocIDs);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1893 | for (const VarLoc &VL : VarLocs)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1894 | dbgs() << " gathered candidate incoming var: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1895 | << VL.Var.getVariable()->getName() << "\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1896 | }do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false) |
| 1897 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { VarVec VarLocs ; collectAllVarLocs(VarLocs, InLocsT, VarLocIDs); for (const VarLoc &VL : VarLocs) dbgs() << " gathered candidate incoming var: " << VL.Var.getVariable()->getName() << "\n"; } }; } } while (false); |
| 1898 | |
| 1899 | NumVisited++; |
| 1900 | } |
| 1901 | |
| 1902 | // Filter out DBG_VALUES that are out of scope. |
| 1903 | VarLocSet KillSet(Alloc); |
| 1904 | bool IsArtificial = ArtificialBlocks.count(&MBB); |
| 1905 | if (!IsArtificial) { |
| 1906 | for (uint64_t ID : InLocsT) { |
| 1907 | LocIndex Idx = LocIndex::fromRawInteger(ID); |
| 1908 | if (!VarLocIDs[Idx].dominates(LS, MBB)) { |
| 1909 | KillSet.set(ID); |
| 1910 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[Idx].Var.getVariable ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
| 1911 | auto Name = VarLocIDs[Idx].Var.getVariable()->getName();do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[Idx].Var.getVariable ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
| 1912 | dbgs() << " killing " << Name << ", it doesn't dominate MBB\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[Idx].Var.getVariable ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
| 1913 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[Idx].Var.getVariable ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false); |
| 1914 | } |
| 1915 | } |
| 1916 | } |
| 1917 | InLocsT.intersectWithComplement(KillSet); |
| 1918 | |
| 1919 | // As we are processing blocks in reverse post-order we |
| 1920 | // should have processed at least one predecessor, unless it |
| 1921 | // is the entry block which has no predecessor. |
| 1922 | assert((NumVisited || MBB.pred_empty()) &&(static_cast <bool> ((NumVisited || MBB.pred_empty()) && "Should have processed at least one predecessor") ? void (0) : __assert_fail ("(NumVisited || MBB.pred_empty()) && \"Should have processed at least one predecessor\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1923, __extension__ __PRETTY_FUNCTION__)) |
| 1923 | "Should have processed at least one predecessor")(static_cast <bool> ((NumVisited || MBB.pred_empty()) && "Should have processed at least one predecessor") ? void (0) : __assert_fail ("(NumVisited || MBB.pred_empty()) && \"Should have processed at least one predecessor\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1923, __extension__ __PRETTY_FUNCTION__)); |
| 1924 | |
| 1925 | VarLocSet &ILS = getVarLocsInMBB(&MBB, InLocs); |
| 1926 | bool Changed = false; |
| 1927 | if (ILS != InLocsT) { |
| 1928 | ILS = InLocsT; |
| 1929 | Changed = true; |
| 1930 | } |
| 1931 | |
| 1932 | return Changed; |
| 1933 | } |
| 1934 | |
| 1935 | void VarLocBasedLDV::flushPendingLocs(VarLocInMBB &PendingInLocs, |
| 1936 | VarLocMap &VarLocIDs) { |
| 1937 | // PendingInLocs records all locations propagated into blocks, which have |
| 1938 | // not had DBG_VALUE insts created. Go through and create those insts now. |
| 1939 | for (auto &Iter : PendingInLocs) { |
| 1940 | // Map is keyed on a constant pointer, unwrap it so we can insert insts. |
| 1941 | auto &MBB = const_cast<MachineBasicBlock &>(*Iter.first); |
| 1942 | VarLocSet &Pending = *Iter.second.get(); |
| 1943 | |
| 1944 | SmallVector<VarLoc, 32> VarLocs; |
| 1945 | collectAllVarLocs(VarLocs, Pending, VarLocIDs); |
| 1946 | |
| 1947 | for (VarLoc DiffIt : VarLocs) { |
| 1948 | // The ID location is live-in to MBB -- work out what kind of machine |
| 1949 | // location it is and create a DBG_VALUE. |
| 1950 | if (DiffIt.isEntryBackupLoc()) |
| 1951 | continue; |
| 1952 | MachineInstr *MI = DiffIt.BuildDbgValue(*MBB.getParent()); |
| 1953 | MBB.insert(MBB.instr_begin(), MI); |
| 1954 | |
| 1955 | (void)MI; |
| 1956 | LLVM_DEBUG(dbgs() << "Inserted: "; MI->dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Inserted: "; MI->dump ();; } } while (false); |
| 1957 | } |
| 1958 | } |
| 1959 | } |
| 1960 | |
| 1961 | bool VarLocBasedLDV::isEntryValueCandidate( |
| 1962 | const MachineInstr &MI, const DefinedRegsSet &DefinedRegs) const { |
| 1963 | assert(MI.isDebugValue() && "This must be DBG_VALUE.")(static_cast <bool> (MI.isDebugValue() && "This must be DBG_VALUE." ) ? void (0) : __assert_fail ("MI.isDebugValue() && \"This must be DBG_VALUE.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 1963, __extension__ __PRETTY_FUNCTION__)); |
| 1964 | |
| 1965 | // TODO: Add support for local variables that are expressed in terms of |
| 1966 | // parameters entry values. |
| 1967 | // TODO: Add support for modified arguments that can be expressed |
| 1968 | // by using its entry value. |
| 1969 | auto *DIVar = MI.getDebugVariable(); |
| 1970 | if (!DIVar->isParameter()) |
| 1971 | return false; |
| 1972 | |
| 1973 | // Do not consider parameters that belong to an inlined function. |
| 1974 | if (MI.getDebugLoc()->getInlinedAt()) |
| 1975 | return false; |
| 1976 | |
| 1977 | // Only consider parameters that are described using registers. Parameters |
| 1978 | // that are passed on the stack are not yet supported, so ignore debug |
| 1979 | // values that are described by the frame or stack pointer. |
| 1980 | if (!isRegOtherThanSPAndFP(MI.getDebugOperand(0), MI, TRI)) |
| 1981 | return false; |
| 1982 | |
| 1983 | // If a parameter's value has been propagated from the caller, then the |
| 1984 | // parameter's DBG_VALUE may be described using a register defined by some |
| 1985 | // instruction in the entry block, in which case we shouldn't create an |
| 1986 | // entry value. |
| 1987 | if (DefinedRegs.count(MI.getDebugOperand(0).getReg())) |
| 1988 | return false; |
| 1989 | |
| 1990 | // TODO: Add support for parameters that have a pre-existing debug expressions |
| 1991 | // (e.g. fragments). |
| 1992 | if (MI.getDebugExpression()->getNumElements() > 0) |
| 1993 | return false; |
| 1994 | |
| 1995 | return true; |
| 1996 | } |
| 1997 | |
| 1998 | /// Collect all register defines (including aliases) for the given instruction. |
| 1999 | static void collectRegDefs(const MachineInstr &MI, DefinedRegsSet &Regs, |
| 2000 | const TargetRegisterInfo *TRI) { |
| 2001 | for (const MachineOperand &MO : MI.operands()) |
| 2002 | if (MO.isReg() && MO.isDef() && MO.getReg()) |
| 2003 | for (MCRegAliasIterator AI(MO.getReg(), TRI, true); AI.isValid(); ++AI) |
| 2004 | Regs.insert(*AI); |
| 2005 | } |
| 2006 | |
| 2007 | /// This routine records the entry values of function parameters. The values |
| 2008 | /// could be used as backup values. If we loose the track of some unmodified |
| 2009 | /// parameters, the backup values will be used as a primary locations. |
| 2010 | void VarLocBasedLDV::recordEntryValue(const MachineInstr &MI, |
| 2011 | const DefinedRegsSet &DefinedRegs, |
| 2012 | OpenRangesSet &OpenRanges, |
| 2013 | VarLocMap &VarLocIDs) { |
| 2014 | if (TPC) { |
| 2015 | auto &TM = TPC->getTM<TargetMachine>(); |
| 2016 | if (!TM.Options.ShouldEmitDebugEntryValues()) |
| 2017 | return; |
| 2018 | } |
| 2019 | |
| 2020 | DebugVariable V(MI.getDebugVariable(), MI.getDebugExpression(), |
| 2021 | MI.getDebugLoc()->getInlinedAt()); |
| 2022 | |
| 2023 | if (!isEntryValueCandidate(MI, DefinedRegs) || |
| 2024 | OpenRanges.getEntryValueBackup(V)) |
| 2025 | return; |
| 2026 | |
| 2027 | LLVM_DEBUG(dbgs() << "Creating the backup entry location: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Creating the backup entry location: " ; MI.dump();; } } while (false); |
| 2028 | |
| 2029 | // Create the entry value and use it as a backup location until it is |
| 2030 | // valid. It is valid until a parameter is not changed. |
| 2031 | DIExpression *NewExpr = |
| 2032 | DIExpression::prepend(MI.getDebugExpression(), DIExpression::EntryValue); |
| 2033 | VarLoc EntryValLocAsBackup = VarLoc::CreateEntryBackupLoc(MI, LS, NewExpr); |
| 2034 | LocIndices EntryValLocIDs = VarLocIDs.insert(EntryValLocAsBackup); |
| 2035 | OpenRanges.insert(EntryValLocIDs, EntryValLocAsBackup); |
| 2036 | } |
| 2037 | |
| 2038 | /// Calculate the liveness information for the given machine function and |
| 2039 | /// extend ranges across basic blocks. |
| 2040 | bool VarLocBasedLDV::ExtendRanges(MachineFunction &MF, TargetPassConfig *TPC, |
| 2041 | unsigned InputBBLimit, |
| 2042 | unsigned InputDbgValLimit) { |
| 2043 | LLVM_DEBUG(dbgs() << "\nDebug Range Extension\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "\nDebug Range Extension\n" ; } } while (false); |
| 2044 | |
| 2045 | if (!MF.getFunction().getSubprogram()) |
| 2046 | // VarLocBaseLDV will already have removed all DBG_VALUEs. |
| 2047 | return false; |
| 2048 | |
| 2049 | // Skip functions from NoDebug compilation units. |
| 2050 | if (MF.getFunction().getSubprogram()->getUnit()->getEmissionKind() == |
| 2051 | DICompileUnit::NoDebug) |
| 2052 | return false; |
| 2053 | |
| 2054 | TRI = MF.getSubtarget().getRegisterInfo(); |
| 2055 | TII = MF.getSubtarget().getInstrInfo(); |
| 2056 | TFI = MF.getSubtarget().getFrameLowering(); |
| 2057 | TFI->getCalleeSaves(MF, CalleeSavedRegs); |
| 2058 | this->TPC = TPC; |
| 2059 | LS.initialize(MF); |
| 2060 | |
| 2061 | bool Changed = false; |
| 2062 | bool OLChanged = false; |
| 2063 | bool MBBJoined = false; |
| 2064 | |
| 2065 | VarLocMap VarLocIDs; // Map VarLoc<>unique ID for use in bitvectors. |
| 2066 | OverlapMap OverlapFragments; // Map of overlapping variable fragments. |
| 2067 | OpenRangesSet OpenRanges(Alloc, OverlapFragments); |
| 2068 | // Ranges that are open until end of bb. |
| 2069 | VarLocInMBB OutLocs; // Ranges that exist beyond bb. |
| 2070 | VarLocInMBB InLocs; // Ranges that are incoming after joining. |
| 2071 | TransferMap Transfers; // DBG_VALUEs associated with transfers (such as |
| 2072 | // spills, copies and restores). |
| 2073 | |
| 2074 | VarToFragments SeenFragments; |
| 2075 | |
| 2076 | // Blocks which are artificial, i.e. blocks which exclusively contain |
| 2077 | // instructions without locations, or with line 0 locations. |
| 2078 | SmallPtrSet<const MachineBasicBlock *, 16> ArtificialBlocks; |
| 2079 | |
| 2080 | DenseMap<unsigned int, MachineBasicBlock *> OrderToBB; |
| 2081 | DenseMap<MachineBasicBlock *, unsigned int> BBToOrder; |
| 2082 | std::priority_queue<unsigned int, std::vector<unsigned int>, |
| 2083 | std::greater<unsigned int>> |
| 2084 | Worklist; |
| 2085 | std::priority_queue<unsigned int, std::vector<unsigned int>, |
| 2086 | std::greater<unsigned int>> |
| 2087 | Pending; |
| 2088 | |
| 2089 | // Set of register defines that are seen when traversing the entry block |
| 2090 | // looking for debug entry value candidates. |
| 2091 | DefinedRegsSet DefinedRegs; |
| 2092 | |
| 2093 | // Only in the case of entry MBB collect DBG_VALUEs representing |
| 2094 | // function parameters in order to generate debug entry values for them. |
| 2095 | MachineBasicBlock &First_MBB = *(MF.begin()); |
| 2096 | for (auto &MI : First_MBB) { |
| 2097 | collectRegDefs(MI, DefinedRegs, TRI); |
| 2098 | if (MI.isDebugValue()) |
| 2099 | recordEntryValue(MI, DefinedRegs, OpenRanges, VarLocIDs); |
| 2100 | } |
| 2101 | |
| 2102 | // Initialize per-block structures and scan for fragment overlaps. |
| 2103 | for (auto &MBB : MF) |
| 2104 | for (auto &MI : MBB) |
| 2105 | if (MI.isDebugValue()) |
| 2106 | accumulateFragmentMap(MI, SeenFragments, OverlapFragments); |
| 2107 | |
| 2108 | auto hasNonArtificialLocation = [](const MachineInstr &MI) -> bool { |
| 2109 | if (const DebugLoc &DL = MI.getDebugLoc()) |
| 2110 | return DL.getLine() != 0; |
| 2111 | return false; |
| 2112 | }; |
| 2113 | for (auto &MBB : MF) |
| 2114 | if (none_of(MBB.instrs(), hasNonArtificialLocation)) |
| 2115 | ArtificialBlocks.insert(&MBB); |
| 2116 | |
| 2117 | LLVM_DEBUG(printVarLocInMBB(MF, OutLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after initialization", dbgs()); } } while (false) |
| 2118 | "OutLocs after initialization", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after initialization", dbgs()); } } while (false); |
| 2119 | |
| 2120 | ReversePostOrderTraversal<MachineFunction *> RPOT(&MF); |
| 2121 | unsigned int RPONumber = 0; |
| 2122 | for (MachineBasicBlock *MBB : RPOT) { |
| 2123 | OrderToBB[RPONumber] = MBB; |
| 2124 | BBToOrder[MBB] = RPONumber; |
| 2125 | Worklist.push(RPONumber); |
| 2126 | ++RPONumber; |
| 2127 | } |
| 2128 | |
| 2129 | if (RPONumber > InputBBLimit) { |
| 2130 | unsigned NumInputDbgValues = 0; |
| 2131 | for (auto &MBB : MF) |
| 2132 | for (auto &MI : MBB) |
| 2133 | if (MI.isDebugValue()) |
| 2134 | ++NumInputDbgValues; |
| 2135 | if (NumInputDbgValues > InputDbgValLimit) { |
| 2136 | LLVM_DEBUG(dbgs() << "Disabling VarLocBasedLDV: " << MF.getName()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Disabling VarLocBasedLDV: " << MF.getName() << " has " << RPONumber << " basic blocks and " << NumInputDbgValues << " input DBG_VALUEs, exceeding limits.\n" ; } } while (false) |
| 2137 | << " has " << RPONumber << " basic blocks and "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Disabling VarLocBasedLDV: " << MF.getName() << " has " << RPONumber << " basic blocks and " << NumInputDbgValues << " input DBG_VALUEs, exceeding limits.\n" ; } } while (false) |
| 2138 | << NumInputDbgValuesdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Disabling VarLocBasedLDV: " << MF.getName() << " has " << RPONumber << " basic blocks and " << NumInputDbgValues << " input DBG_VALUEs, exceeding limits.\n" ; } } while (false) |
| 2139 | << " input DBG_VALUEs, exceeding limits.\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Disabling VarLocBasedLDV: " << MF.getName() << " has " << RPONumber << " basic blocks and " << NumInputDbgValues << " input DBG_VALUEs, exceeding limits.\n" ; } } while (false); |
| 2140 | return false; |
| 2141 | } |
| 2142 | } |
| 2143 | |
| 2144 | // This is a standard "union of predecessor outs" dataflow problem. |
| 2145 | // To solve it, we perform join() and process() using the two worklist method |
| 2146 | // until the ranges converge. |
| 2147 | // Ranges have converged when both worklists are empty. |
| 2148 | SmallPtrSet<const MachineBasicBlock *, 16> Visited; |
| 2149 | while (!Worklist.empty() || !Pending.empty()) { |
| 2150 | // We track what is on the pending worklist to avoid inserting the same |
| 2151 | // thing twice. We could avoid this with a custom priority queue, but this |
| 2152 | // is probably not worth it. |
| 2153 | SmallPtrSet<MachineBasicBlock *, 16> OnPending; |
| 2154 | LLVM_DEBUG(dbgs() << "Processing Worklist\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Processing Worklist\n" ; } } while (false); |
| 2155 | while (!Worklist.empty()) { |
| 2156 | MachineBasicBlock *MBB = OrderToBB[Worklist.top()]; |
| 2157 | Worklist.pop(); |
| 2158 | MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs, Visited, |
| 2159 | ArtificialBlocks); |
| 2160 | MBBJoined |= Visited.insert(MBB).second; |
| 2161 | if (MBBJoined) { |
| 2162 | MBBJoined = false; |
Value stored to 'MBBJoined' is never read | |
| 2163 | Changed = true; |
| 2164 | // Now that we have started to extend ranges across BBs we need to |
| 2165 | // examine spill, copy and restore instructions to see whether they |
| 2166 | // operate with registers that correspond to user variables. |
| 2167 | // First load any pending inlocs. |
| 2168 | OpenRanges.insertFromLocSet(getVarLocsInMBB(MBB, InLocs), VarLocIDs); |
| 2169 | for (auto &MI : *MBB) |
| 2170 | process(MI, OpenRanges, VarLocIDs, Transfers); |
| 2171 | OLChanged |= transferTerminator(MBB, OpenRanges, OutLocs, VarLocIDs); |
| 2172 | |
| 2173 | LLVM_DEBUG(printVarLocInMBB(MF, OutLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after propagating", dbgs()); } } while (false) |
| 2174 | "OutLocs after propagating", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after propagating", dbgs()); } } while (false); |
| 2175 | LLVM_DEBUG(printVarLocInMBB(MF, InLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, InLocs, VarLocIDs , "InLocs after propagating", dbgs()); } } while (false) |
| 2176 | "InLocs after propagating", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, InLocs, VarLocIDs , "InLocs after propagating", dbgs()); } } while (false); |
| 2177 | |
| 2178 | if (OLChanged) { |
| 2179 | OLChanged = false; |
| 2180 | for (auto s : MBB->successors()) |
| 2181 | if (OnPending.insert(s).second) { |
| 2182 | Pending.push(BBToOrder[s]); |
| 2183 | } |
| 2184 | } |
| 2185 | } |
| 2186 | } |
| 2187 | Worklist.swap(Pending); |
| 2188 | // At this point, pending must be empty, since it was just the empty |
| 2189 | // worklist |
| 2190 | assert(Pending.empty() && "Pending should be empty")(static_cast <bool> (Pending.empty() && "Pending should be empty" ) ? void (0) : __assert_fail ("Pending.empty() && \"Pending should be empty\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 2190, __extension__ __PRETTY_FUNCTION__)); |
| 2191 | } |
| 2192 | |
| 2193 | // Add any DBG_VALUE instructions created by location transfers. |
| 2194 | for (auto &TR : Transfers) { |
| 2195 | assert(!TR.TransferInst->isTerminator() &&(static_cast <bool> (!TR.TransferInst->isTerminator( ) && "Cannot insert DBG_VALUE after terminator") ? void (0) : __assert_fail ("!TR.TransferInst->isTerminator() && \"Cannot insert DBG_VALUE after terminator\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 2196, __extension__ __PRETTY_FUNCTION__)) |
| 2196 | "Cannot insert DBG_VALUE after terminator")(static_cast <bool> (!TR.TransferInst->isTerminator( ) && "Cannot insert DBG_VALUE after terminator") ? void (0) : __assert_fail ("!TR.TransferInst->isTerminator() && \"Cannot insert DBG_VALUE after terminator\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp" , 2196, __extension__ __PRETTY_FUNCTION__)); |
| 2197 | MachineBasicBlock *MBB = TR.TransferInst->getParent(); |
| 2198 | const VarLoc &VL = VarLocIDs[TR.LocationID]; |
| 2199 | MachineInstr *MI = VL.BuildDbgValue(MF); |
| 2200 | MBB->insertAfterBundle(TR.TransferInst->getIterator(), MI); |
| 2201 | } |
| 2202 | Transfers.clear(); |
| 2203 | |
| 2204 | // Deferred inlocs will not have had any DBG_VALUE insts created; do |
| 2205 | // that now. |
| 2206 | flushPendingLocs(InLocs, VarLocIDs); |
| 2207 | |
| 2208 | LLVM_DEBUG(printVarLocInMBB(MF, OutLocs, VarLocIDs, "Final OutLocs", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "Final OutLocs", dbgs()); } } while (false); |
| 2209 | LLVM_DEBUG(printVarLocInMBB(MF, InLocs, VarLocIDs, "Final InLocs", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, InLocs, VarLocIDs , "Final InLocs", dbgs()); } } while (false); |
| 2210 | return Changed; |
| 2211 | } |
| 2212 | |
| 2213 | LDVImpl * |
| 2214 | llvm::makeVarLocBasedLiveDebugValues() |
| 2215 | { |
| 2216 | return new VarLocBasedLDV(); |
| 2217 | } |