File: | lib/CodeGen/LiveDebugValues.cpp |
Warning: | line 1379, column 9 Value stored to 'MBBJoined' is never read |
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1 | //===- LiveDebugValues.cpp - Tracking Debug Value MIs ---------------------===// |
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 | /// This pass implements a data flow analysis that propagates debug location |
10 | /// information by inserting additional DBG_VALUE insts into the machine |
11 | /// instruction stream. Before running, each DBG_VALUE inst corresponds to a |
12 | /// source assignment of a variable. Afterwards, a DBG_VALUE inst specifies a |
13 | /// variable location for the current basic block (see SourceLevelDebugging.rst). |
14 | /// |
15 | /// This is a separate pass from DbgValueHistoryCalculator to facilitate |
16 | /// testing and improve modularity. |
17 | /// |
18 | /// Each variable location is represented by a VarLoc object that identifies the |
19 | /// source variable, its current machine-location, and the DBG_VALUE inst that |
20 | /// specifies the location. Each VarLoc is indexed in the (function-scope) |
21 | /// VarLocMap, giving each VarLoc a unique index. Rather than operate directly |
22 | /// on machine locations, the dataflow analysis in this pass identifies |
23 | /// locations by their index in the VarLocMap, meaning all the variable |
24 | /// locations in a block can be described by a sparse vector of VarLocMap |
25 | /// indexes. |
26 | /// |
27 | //===----------------------------------------------------------------------===// |
28 | |
29 | #include "llvm/ADT/DenseMap.h" |
30 | #include "llvm/ADT/PostOrderIterator.h" |
31 | #include "llvm/ADT/SmallPtrSet.h" |
32 | #include "llvm/ADT/SmallSet.h" |
33 | #include "llvm/ADT/SmallVector.h" |
34 | #include "llvm/ADT/SparseBitVector.h" |
35 | #include "llvm/ADT/Statistic.h" |
36 | #include "llvm/ADT/UniqueVector.h" |
37 | #include "llvm/CodeGen/LexicalScopes.h" |
38 | #include "llvm/CodeGen/MachineBasicBlock.h" |
39 | #include "llvm/CodeGen/MachineFrameInfo.h" |
40 | #include "llvm/CodeGen/MachineFunction.h" |
41 | #include "llvm/CodeGen/MachineFunctionPass.h" |
42 | #include "llvm/CodeGen/MachineInstr.h" |
43 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
44 | #include "llvm/CodeGen/MachineMemOperand.h" |
45 | #include "llvm/CodeGen/MachineOperand.h" |
46 | #include "llvm/CodeGen/PseudoSourceValue.h" |
47 | #include "llvm/CodeGen/RegisterScavenging.h" |
48 | #include "llvm/CodeGen/TargetFrameLowering.h" |
49 | #include "llvm/CodeGen/TargetInstrInfo.h" |
50 | #include "llvm/CodeGen/TargetLowering.h" |
51 | #include "llvm/CodeGen/TargetPassConfig.h" |
52 | #include "llvm/CodeGen/TargetRegisterInfo.h" |
53 | #include "llvm/CodeGen/TargetSubtargetInfo.h" |
54 | #include "llvm/Config/llvm-config.h" |
55 | #include "llvm/IR/DIBuilder.h" |
56 | #include "llvm/IR/DebugInfoMetadata.h" |
57 | #include "llvm/IR/DebugLoc.h" |
58 | #include "llvm/IR/Function.h" |
59 | #include "llvm/IR/Module.h" |
60 | #include "llvm/MC/MCRegisterInfo.h" |
61 | #include "llvm/Pass.h" |
62 | #include "llvm/Support/Casting.h" |
63 | #include "llvm/Support/Compiler.h" |
64 | #include "llvm/Support/Debug.h" |
65 | #include "llvm/Support/raw_ostream.h" |
66 | #include <algorithm> |
67 | #include <cassert> |
68 | #include <cstdint> |
69 | #include <functional> |
70 | #include <queue> |
71 | #include <tuple> |
72 | #include <utility> |
73 | #include <vector> |
74 | |
75 | using namespace llvm; |
76 | |
77 | #define DEBUG_TYPE"livedebugvalues" "livedebugvalues" |
78 | |
79 | STATISTIC(NumInserted, "Number of DBG_VALUE instructions inserted")static llvm::Statistic NumInserted = {"livedebugvalues", "NumInserted" , "Number of DBG_VALUE instructions inserted"}; |
80 | STATISTIC(NumRemoved, "Number of DBG_VALUE instructions removed")static llvm::Statistic NumRemoved = {"livedebugvalues", "NumRemoved" , "Number of DBG_VALUE instructions removed"}; |
81 | |
82 | // If @MI is a DBG_VALUE with debug value described by a defined |
83 | // register, returns the number of this register. In the other case, returns 0. |
84 | static Register isDbgValueDescribedByReg(const MachineInstr &MI) { |
85 | assert(MI.isDebugValue() && "expected a DBG_VALUE")((MI.isDebugValue() && "expected a DBG_VALUE") ? static_cast <void> (0) : __assert_fail ("MI.isDebugValue() && \"expected a DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 85, __PRETTY_FUNCTION__)); |
86 | assert(MI.getNumOperands() == 4 && "malformed DBG_VALUE")((MI.getNumOperands() == 4 && "malformed DBG_VALUE") ? static_cast<void> (0) : __assert_fail ("MI.getNumOperands() == 4 && \"malformed DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 86, __PRETTY_FUNCTION__)); |
87 | // If location of variable is described using a register (directly |
88 | // or indirectly), this register is always a first operand. |
89 | return MI.getOperand(0).isReg() ? MI.getOperand(0).getReg() : Register(); |
90 | } |
91 | |
92 | namespace { |
93 | |
94 | class LiveDebugValues : public MachineFunctionPass { |
95 | private: |
96 | const TargetRegisterInfo *TRI; |
97 | const TargetInstrInfo *TII; |
98 | const TargetFrameLowering *TFI; |
99 | BitVector CalleeSavedRegs; |
100 | LexicalScopes LS; |
101 | |
102 | enum struct TransferKind { TransferCopy, TransferSpill, TransferRestore }; |
103 | |
104 | /// Keeps track of lexical scopes associated with a user value's source |
105 | /// location. |
106 | class UserValueScopes { |
107 | DebugLoc DL; |
108 | LexicalScopes &LS; |
109 | SmallPtrSet<const MachineBasicBlock *, 4> LBlocks; |
110 | |
111 | public: |
112 | UserValueScopes(DebugLoc D, LexicalScopes &L) : DL(std::move(D)), LS(L) {} |
113 | |
114 | /// Return true if current scope dominates at least one machine |
115 | /// instruction in a given machine basic block. |
116 | bool dominates(MachineBasicBlock *MBB) { |
117 | if (LBlocks.empty()) |
118 | LS.getMachineBasicBlocks(DL, LBlocks); |
119 | return LBlocks.count(MBB) != 0 || LS.dominates(DL, MBB); |
120 | } |
121 | }; |
122 | |
123 | using FragmentInfo = DIExpression::FragmentInfo; |
124 | using OptFragmentInfo = Optional<DIExpression::FragmentInfo>; |
125 | |
126 | /// Storage for identifying a potentially inlined instance of a variable, |
127 | /// or a fragment thereof. |
128 | class DebugVariable { |
129 | const DILocalVariable *Variable; |
130 | OptFragmentInfo Fragment; |
131 | const DILocation *InlinedAt; |
132 | |
133 | /// Fragment that will overlap all other fragments. Used as default when |
134 | /// caller demands a fragment. |
135 | static const FragmentInfo DefaultFragment; |
136 | |
137 | public: |
138 | DebugVariable(const DILocalVariable *Var, OptFragmentInfo &&FragmentInfo, |
139 | const DILocation *InlinedAt) |
140 | : Variable(Var), Fragment(FragmentInfo), InlinedAt(InlinedAt) {} |
141 | |
142 | DebugVariable(const DILocalVariable *Var, OptFragmentInfo &FragmentInfo, |
143 | const DILocation *InlinedAt) |
144 | : Variable(Var), Fragment(FragmentInfo), InlinedAt(InlinedAt) {} |
145 | |
146 | DebugVariable(const DILocalVariable *Var, const DIExpression *DIExpr, |
147 | const DILocation *InlinedAt) |
148 | : DebugVariable(Var, DIExpr->getFragmentInfo(), InlinedAt) {} |
149 | |
150 | DebugVariable(const MachineInstr &MI) |
151 | : DebugVariable(MI.getDebugVariable(), |
152 | MI.getDebugExpression()->getFragmentInfo(), |
153 | MI.getDebugLoc()->getInlinedAt()) {} |
154 | |
155 | const DILocalVariable *getVar() const { return Variable; } |
156 | const OptFragmentInfo &getFragment() const { return Fragment; } |
157 | const DILocation *getInlinedAt() const { return InlinedAt; } |
158 | |
159 | const FragmentInfo getFragmentDefault() const { |
160 | return Fragment.getValueOr(DefaultFragment); |
161 | } |
162 | |
163 | static bool isFragmentDefault(FragmentInfo &F) { |
164 | return F == DefaultFragment; |
165 | } |
166 | |
167 | bool operator==(const DebugVariable &Other) const { |
168 | return std::tie(Variable, Fragment, InlinedAt) == |
169 | std::tie(Other.Variable, Other.Fragment, Other.InlinedAt); |
170 | } |
171 | |
172 | bool operator<(const DebugVariable &Other) const { |
173 | return std::tie(Variable, Fragment, InlinedAt) < |
174 | std::tie(Other.Variable, Other.Fragment, Other.InlinedAt); |
175 | } |
176 | }; |
177 | |
178 | friend struct llvm::DenseMapInfo<DebugVariable>; |
179 | |
180 | /// A pair of debug variable and value location. |
181 | struct VarLoc { |
182 | // The location at which a spilled variable resides. It consists of a |
183 | // register and an offset. |
184 | struct SpillLoc { |
185 | unsigned SpillBase; |
186 | int SpillOffset; |
187 | bool operator==(const SpillLoc &Other) const { |
188 | return SpillBase == Other.SpillBase && SpillOffset == Other.SpillOffset; |
189 | } |
190 | }; |
191 | |
192 | /// Identity of the variable at this location. |
193 | const DebugVariable Var; |
194 | |
195 | /// The expression applied to this location. |
196 | const DIExpression *Expr; |
197 | |
198 | /// DBG_VALUE to clone var/expr information from if this location |
199 | /// is moved. |
200 | const MachineInstr &MI; |
201 | |
202 | mutable UserValueScopes UVS; |
203 | enum VarLocKind { |
204 | InvalidKind = 0, |
205 | RegisterKind, |
206 | SpillLocKind, |
207 | ImmediateKind, |
208 | EntryValueKind |
209 | } Kind = InvalidKind; |
210 | |
211 | /// The value location. Stored separately to avoid repeatedly |
212 | /// extracting it from MI. |
213 | union { |
214 | uint64_t RegNo; |
215 | SpillLoc SpillLocation; |
216 | uint64_t Hash; |
217 | int64_t Immediate; |
218 | const ConstantFP *FPImm; |
219 | const ConstantInt *CImm; |
220 | } Loc; |
221 | |
222 | VarLoc(const MachineInstr &MI, LexicalScopes &LS) |
223 | : Var(MI), Expr(MI.getDebugExpression()), MI(MI), |
224 | UVS(MI.getDebugLoc(), LS) { |
225 | static_assert((sizeof(Loc) == sizeof(uint64_t)), |
226 | "hash does not cover all members of Loc"); |
227 | assert(MI.isDebugValue() && "not a DBG_VALUE")((MI.isDebugValue() && "not a DBG_VALUE") ? static_cast <void> (0) : __assert_fail ("MI.isDebugValue() && \"not a DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 227, __PRETTY_FUNCTION__)); |
228 | assert(MI.getNumOperands() == 4 && "malformed DBG_VALUE")((MI.getNumOperands() == 4 && "malformed DBG_VALUE") ? static_cast<void> (0) : __assert_fail ("MI.getNumOperands() == 4 && \"malformed DBG_VALUE\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 228, __PRETTY_FUNCTION__)); |
229 | if (int RegNo = isDbgValueDescribedByReg(MI)) { |
230 | Kind = MI.isDebugEntryValue() ? EntryValueKind : RegisterKind; |
231 | Loc.RegNo = RegNo; |
232 | } else if (MI.getOperand(0).isImm()) { |
233 | Kind = ImmediateKind; |
234 | Loc.Immediate = MI.getOperand(0).getImm(); |
235 | } else if (MI.getOperand(0).isFPImm()) { |
236 | Kind = ImmediateKind; |
237 | Loc.FPImm = MI.getOperand(0).getFPImm(); |
238 | } else if (MI.getOperand(0).isCImm()) { |
239 | Kind = ImmediateKind; |
240 | Loc.CImm = MI.getOperand(0).getCImm(); |
241 | } |
242 | assert((Kind != ImmediateKind || !MI.isDebugEntryValue()) &&(((Kind != ImmediateKind || !MI.isDebugEntryValue()) && "entry values must be register locations") ? static_cast< void> (0) : __assert_fail ("(Kind != ImmediateKind || !MI.isDebugEntryValue()) && \"entry values must be register locations\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 243, __PRETTY_FUNCTION__)) |
243 | "entry values must be register locations")(((Kind != ImmediateKind || !MI.isDebugEntryValue()) && "entry values must be register locations") ? static_cast< void> (0) : __assert_fail ("(Kind != ImmediateKind || !MI.isDebugEntryValue()) && \"entry values must be register locations\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 243, __PRETTY_FUNCTION__)); |
244 | } |
245 | |
246 | /// Take the variable and machine-location in DBG_VALUE MI, and build an |
247 | /// entry location using the given expression. |
248 | static VarLoc CreateEntryLoc(const MachineInstr &MI, LexicalScopes &LS, |
249 | const DIExpression *EntryExpr) { |
250 | VarLoc VL(MI, LS); |
251 | VL.Kind = EntryValueKind; |
252 | VL.Expr = EntryExpr; |
253 | return VL; |
254 | } |
255 | |
256 | /// Copy the register location in DBG_VALUE MI, updating the register to |
257 | /// be NewReg. |
258 | static VarLoc CreateCopyLoc(const MachineInstr &MI, LexicalScopes &LS, |
259 | unsigned NewReg) { |
260 | VarLoc VL(MI, LS); |
261 | assert(VL.Kind == RegisterKind)((VL.Kind == RegisterKind) ? static_cast<void> (0) : __assert_fail ("VL.Kind == RegisterKind", "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 261, __PRETTY_FUNCTION__)); |
262 | VL.Loc.RegNo = NewReg; |
263 | return VL; |
264 | } |
265 | |
266 | /// Take the variable described by DBG_VALUE MI, and create a VarLoc |
267 | /// locating it in the specified spill location. |
268 | static VarLoc CreateSpillLoc(const MachineInstr &MI, unsigned SpillBase, |
269 | int SpillOffset, LexicalScopes &LS) { |
270 | VarLoc VL(MI, LS); |
271 | assert(VL.Kind == RegisterKind)((VL.Kind == RegisterKind) ? static_cast<void> (0) : __assert_fail ("VL.Kind == RegisterKind", "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 271, __PRETTY_FUNCTION__)); |
272 | VL.Kind = SpillLocKind; |
273 | VL.Loc.SpillLocation = {SpillBase, SpillOffset}; |
274 | return VL; |
275 | } |
276 | |
277 | /// Create a DBG_VALUE representing this VarLoc in the given function. |
278 | /// Copies variable-specific information such as DILocalVariable and |
279 | /// inlining information from the original DBG_VALUE instruction, which may |
280 | /// have been several transfers ago. |
281 | MachineInstr *BuildDbgValue(MachineFunction &MF) const { |
282 | const DebugLoc &DbgLoc = MI.getDebugLoc(); |
283 | bool Indirect = MI.isIndirectDebugValue(); |
284 | const auto &IID = MI.getDesc(); |
285 | const DILocalVariable *Var = MI.getDebugVariable(); |
286 | const DIExpression *DIExpr = MI.getDebugExpression(); |
287 | |
288 | switch (Kind) { |
289 | case EntryValueKind: |
290 | // An entry value is a register location -- but with an updated |
291 | // expression. |
292 | return BuildMI(MF, DbgLoc, IID, Indirect, Loc.RegNo, Var, Expr); |
293 | case RegisterKind: |
294 | // Register locations are like the source DBG_VALUE, but with the |
295 | // register number from this VarLoc. |
296 | return BuildMI(MF, DbgLoc, IID, Indirect, Loc.RegNo, Var, DIExpr); |
297 | case SpillLocKind: { |
298 | // Spills are indirect DBG_VALUEs, with a base register and offset. |
299 | // Use the original DBG_VALUEs expression to build the spilt location |
300 | // on top of. FIXME: spill locations created before this pass runs |
301 | // are not recognized, and not handled here. |
302 | auto *SpillExpr = DIExpression::prepend( |
303 | DIExpr, DIExpression::ApplyOffset, Loc.SpillLocation.SpillOffset); |
304 | unsigned Base = Loc.SpillLocation.SpillBase; |
305 | return BuildMI(MF, DbgLoc, IID, true, Base, Var, SpillExpr); |
306 | } |
307 | case ImmediateKind: { |
308 | MachineOperand MO = MI.getOperand(0); |
309 | return BuildMI(MF, DbgLoc, IID, Indirect, MO, Var, DIExpr); |
310 | } |
311 | case InvalidKind: |
312 | 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-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 312); |
313 | } |
314 | llvm_unreachable("Unrecognized LiveDebugValues.VarLoc.Kind enum")::llvm::llvm_unreachable_internal("Unrecognized LiveDebugValues.VarLoc.Kind enum" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 314); |
315 | } |
316 | |
317 | /// Is the Loc field a constant or constant object? |
318 | bool isConstant() const { return Kind == ImmediateKind; } |
319 | |
320 | /// If this variable is described by a register, return it, |
321 | /// otherwise return 0. |
322 | unsigned isDescribedByReg() const { |
323 | if (Kind == RegisterKind) |
324 | return Loc.RegNo; |
325 | return 0; |
326 | } |
327 | |
328 | /// Determine whether the lexical scope of this value's debug location |
329 | /// dominates MBB. |
330 | bool dominates(MachineBasicBlock &MBB) const { return UVS.dominates(&MBB); } |
331 | |
332 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
333 | // TRI can be null. |
334 | void dump(const TargetRegisterInfo *TRI, raw_ostream &Out = dbgs()) const { |
335 | dbgs() << "VarLoc("; |
336 | switch (Kind) { |
337 | case RegisterKind: |
338 | case EntryValueKind: |
339 | dbgs() << printReg(Loc.RegNo, TRI); |
340 | break; |
341 | case SpillLocKind: |
342 | dbgs() << printReg(Loc.SpillLocation.SpillBase, TRI); |
343 | dbgs() << "[" << Loc.SpillLocation.SpillOffset << "]"; |
344 | break; |
345 | case ImmediateKind: |
346 | dbgs() << Loc.Immediate; |
347 | break; |
348 | case InvalidKind: |
349 | llvm_unreachable("Invalid VarLoc in dump method")::llvm::llvm_unreachable_internal("Invalid VarLoc in dump method" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 349); |
350 | } |
351 | |
352 | dbgs() << ", \"" << Var.getVar()->getName() << "\", " << *Expr << ", "; |
353 | if (Var.getInlinedAt()) |
354 | dbgs() << "!" << Var.getInlinedAt()->getMetadataID() << ")\n"; |
355 | else |
356 | dbgs() << "(null))\n"; |
357 | } |
358 | #endif |
359 | |
360 | bool operator==(const VarLoc &Other) const { |
361 | return Kind == Other.Kind && Var == Other.Var && |
362 | Loc.Hash == Other.Loc.Hash && Expr == Other.Expr; |
363 | } |
364 | |
365 | /// This operator guarantees that VarLocs are sorted by Variable first. |
366 | bool operator<(const VarLoc &Other) const { |
367 | return std::tie(Var, Kind, Loc.Hash, Expr) < |
368 | std::tie(Other.Var, Other.Kind, Other.Loc.Hash, Other.Expr); |
369 | } |
370 | }; |
371 | |
372 | using DebugParamMap = SmallDenseMap<const DILocalVariable *, MachineInstr *>; |
373 | using VarLocMap = UniqueVector<VarLoc>; |
374 | using VarLocSet = SparseBitVector<>; |
375 | using VarLocInMBB = SmallDenseMap<const MachineBasicBlock *, VarLocSet>; |
376 | struct TransferDebugPair { |
377 | MachineInstr *TransferInst; /// Instruction where this transfer occurs. |
378 | unsigned LocationID; /// Location number for the transfer dest. |
379 | }; |
380 | using TransferMap = SmallVector<TransferDebugPair, 4>; |
381 | |
382 | // Types for recording sets of variable fragments that overlap. For a given |
383 | // local variable, we record all other fragments of that variable that could |
384 | // overlap it, to reduce search time. |
385 | using FragmentOfVar = |
386 | std::pair<const DILocalVariable *, DIExpression::FragmentInfo>; |
387 | using OverlapMap = |
388 | DenseMap<FragmentOfVar, SmallVector<DIExpression::FragmentInfo, 1>>; |
389 | |
390 | // Helper while building OverlapMap, a map of all fragments seen for a given |
391 | // DILocalVariable. |
392 | using VarToFragments = |
393 | DenseMap<const DILocalVariable *, SmallSet<FragmentInfo, 4>>; |
394 | |
395 | /// This holds the working set of currently open ranges. For fast |
396 | /// access, this is done both as a set of VarLocIDs, and a map of |
397 | /// DebugVariable to recent VarLocID. Note that a DBG_VALUE ends all |
398 | /// previous open ranges for the same variable. |
399 | class OpenRangesSet { |
400 | VarLocSet VarLocs; |
401 | SmallDenseMap<DebugVariable, unsigned, 8> Vars; |
402 | OverlapMap &OverlappingFragments; |
403 | |
404 | public: |
405 | OpenRangesSet(OverlapMap &_OLapMap) : OverlappingFragments(_OLapMap) {} |
406 | |
407 | const VarLocSet &getVarLocs() const { return VarLocs; } |
408 | |
409 | /// Terminate all open ranges for Var by removing it from the set. |
410 | void erase(DebugVariable Var); |
411 | |
412 | /// Terminate all open ranges listed in \c KillSet by removing |
413 | /// them from the set. |
414 | void erase(const VarLocSet &KillSet, const VarLocMap &VarLocIDs) { |
415 | VarLocs.intersectWithComplement(KillSet); |
416 | for (unsigned ID : KillSet) |
417 | Vars.erase(VarLocIDs[ID].Var); |
418 | } |
419 | |
420 | /// Insert a new range into the set. |
421 | void insert(unsigned VarLocID, DebugVariable Var) { |
422 | VarLocs.set(VarLocID); |
423 | Vars.insert({Var, VarLocID}); |
424 | } |
425 | |
426 | /// Insert a set of ranges. |
427 | void insertFromLocSet(const VarLocSet &ToLoad, const VarLocMap &Map) { |
428 | for (unsigned Id : ToLoad) { |
429 | const VarLoc &Var = Map[Id]; |
430 | insert(Id, Var.Var); |
431 | } |
432 | } |
433 | |
434 | /// Empty the set. |
435 | void clear() { |
436 | VarLocs.clear(); |
437 | Vars.clear(); |
438 | } |
439 | |
440 | /// Return whether the set is empty or not. |
441 | bool empty() const { |
442 | assert(Vars.empty() == VarLocs.empty() && "open ranges are inconsistent")((Vars.empty() == VarLocs.empty() && "open ranges are inconsistent" ) ? static_cast<void> (0) : __assert_fail ("Vars.empty() == VarLocs.empty() && \"open ranges are inconsistent\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 442, __PRETTY_FUNCTION__)); |
443 | return VarLocs.empty(); |
444 | } |
445 | }; |
446 | |
447 | /// Tests whether this instruction is a spill to a stack location. |
448 | bool isSpillInstruction(const MachineInstr &MI, MachineFunction *MF); |
449 | |
450 | /// Decide if @MI is a spill instruction and return true if it is. We use 2 |
451 | /// criteria to make this decision: |
452 | /// - Is this instruction a store to a spill slot? |
453 | /// - Is there a register operand that is both used and killed? |
454 | /// TODO: Store optimization can fold spills into other stores (including |
455 | /// other spills). We do not handle this yet (more than one memory operand). |
456 | bool isLocationSpill(const MachineInstr &MI, MachineFunction *MF, |
457 | unsigned &Reg); |
458 | |
459 | /// If a given instruction is identified as a spill, return the spill location |
460 | /// and set \p Reg to the spilled register. |
461 | Optional<VarLoc::SpillLoc> isRestoreInstruction(const MachineInstr &MI, |
462 | MachineFunction *MF, |
463 | unsigned &Reg); |
464 | /// Given a spill instruction, extract the register and offset used to |
465 | /// address the spill location in a target independent way. |
466 | VarLoc::SpillLoc extractSpillBaseRegAndOffset(const MachineInstr &MI); |
467 | void insertTransferDebugPair(MachineInstr &MI, OpenRangesSet &OpenRanges, |
468 | TransferMap &Transfers, VarLocMap &VarLocIDs, |
469 | unsigned OldVarID, TransferKind Kind, |
470 | unsigned NewReg = 0); |
471 | |
472 | void transferDebugValue(const MachineInstr &MI, OpenRangesSet &OpenRanges, |
473 | VarLocMap &VarLocIDs); |
474 | void transferSpillOrRestoreInst(MachineInstr &MI, OpenRangesSet &OpenRanges, |
475 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
476 | void emitEntryValues(MachineInstr &MI, OpenRangesSet &OpenRanges, |
477 | VarLocMap &VarLocIDs, TransferMap &Transfers, |
478 | DebugParamMap &DebugEntryVals, |
479 | SparseBitVector<> &KillSet); |
480 | void transferRegisterCopy(MachineInstr &MI, OpenRangesSet &OpenRanges, |
481 | VarLocMap &VarLocIDs, TransferMap &Transfers); |
482 | void transferRegisterDef(MachineInstr &MI, OpenRangesSet &OpenRanges, |
483 | VarLocMap &VarLocIDs, TransferMap &Transfers, |
484 | DebugParamMap &DebugEntryVals); |
485 | bool transferTerminator(MachineBasicBlock *MBB, OpenRangesSet &OpenRanges, |
486 | VarLocInMBB &OutLocs, const VarLocMap &VarLocIDs); |
487 | |
488 | void process(MachineInstr &MI, OpenRangesSet &OpenRanges, |
489 | VarLocInMBB &OutLocs, VarLocMap &VarLocIDs, |
490 | TransferMap &Transfers, DebugParamMap &DebugEntryVals, |
491 | OverlapMap &OverlapFragments, |
492 | VarToFragments &SeenFragments); |
493 | |
494 | void accumulateFragmentMap(MachineInstr &MI, VarToFragments &SeenFragments, |
495 | OverlapMap &OLapMap); |
496 | |
497 | bool join(MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs, |
498 | const VarLocMap &VarLocIDs, |
499 | SmallPtrSet<const MachineBasicBlock *, 16> &Visited, |
500 | SmallPtrSetImpl<const MachineBasicBlock *> &ArtificialBlocks, |
501 | VarLocInMBB &PendingInLocs); |
502 | |
503 | /// Create DBG_VALUE insts for inlocs that have been propagated but |
504 | /// had their instruction creation deferred. |
505 | void flushPendingLocs(VarLocInMBB &PendingInLocs, VarLocMap &VarLocIDs); |
506 | |
507 | bool ExtendRanges(MachineFunction &MF); |
508 | |
509 | public: |
510 | static char ID; |
511 | |
512 | /// Default construct and initialize the pass. |
513 | LiveDebugValues(); |
514 | |
515 | /// Tell the pass manager which passes we depend on and what |
516 | /// information we preserve. |
517 | void getAnalysisUsage(AnalysisUsage &AU) const override; |
518 | |
519 | MachineFunctionProperties getRequiredProperties() const override { |
520 | return MachineFunctionProperties().set( |
521 | MachineFunctionProperties::Property::NoVRegs); |
522 | } |
523 | |
524 | /// Print to ostream with a message. |
525 | void printVarLocInMBB(const MachineFunction &MF, const VarLocInMBB &V, |
526 | const VarLocMap &VarLocIDs, const char *msg, |
527 | raw_ostream &Out) const; |
528 | |
529 | /// Calculate the liveness information for the given machine function. |
530 | bool runOnMachineFunction(MachineFunction &MF) override; |
531 | }; |
532 | |
533 | } // end anonymous namespace |
534 | |
535 | namespace llvm { |
536 | |
537 | template <> struct DenseMapInfo<LiveDebugValues::DebugVariable> { |
538 | using DV = LiveDebugValues::DebugVariable; |
539 | using OptFragmentInfo = LiveDebugValues::OptFragmentInfo; |
540 | using FragmentInfo = LiveDebugValues::FragmentInfo; |
541 | |
542 | // Empty key: no key should be generated that has no DILocalVariable. |
543 | static inline DV getEmptyKey() { |
544 | return DV(nullptr, OptFragmentInfo(), nullptr); |
545 | } |
546 | |
547 | // Difference in tombstone is that the Optional is meaningful |
548 | static inline DV getTombstoneKey() { |
549 | return DV(nullptr, OptFragmentInfo({0, 0}), nullptr); |
550 | } |
551 | |
552 | static unsigned getHashValue(const DV &D) { |
553 | unsigned HV = 0; |
554 | const OptFragmentInfo &Fragment = D.getFragment(); |
555 | if (Fragment) |
556 | HV = DenseMapInfo<FragmentInfo>::getHashValue(*Fragment); |
557 | |
558 | return hash_combine(D.getVar(), HV, D.getInlinedAt()); |
559 | } |
560 | |
561 | static bool isEqual(const DV &A, const DV &B) { return A == B; } |
562 | }; |
563 | |
564 | } // namespace llvm |
565 | |
566 | //===----------------------------------------------------------------------===// |
567 | // Implementation |
568 | //===----------------------------------------------------------------------===// |
569 | |
570 | const DIExpression::FragmentInfo |
571 | LiveDebugValues::DebugVariable::DefaultFragment = { |
572 | std::numeric_limits<uint64_t>::max(), |
573 | std::numeric_limits<uint64_t>::min()}; |
574 | |
575 | char LiveDebugValues::ID = 0; |
576 | |
577 | char &llvm::LiveDebugValuesID = LiveDebugValues::ID; |
578 | |
579 | INITIALIZE_PASS(LiveDebugValues, DEBUG_TYPE, "Live DEBUG_VALUE analysis",static void *initializeLiveDebugValuesPassOnce(PassRegistry & Registry) { PassInfo *PI = new PassInfo( "Live DEBUG_VALUE analysis" , "livedebugvalues", &LiveDebugValues::ID, PassInfo::NormalCtor_t (callDefaultCtor<LiveDebugValues>), false, false); Registry .registerPass(*PI, true); return PI; } static llvm::once_flag InitializeLiveDebugValuesPassFlag; void llvm::initializeLiveDebugValuesPass (PassRegistry &Registry) { llvm::call_once(InitializeLiveDebugValuesPassFlag , initializeLiveDebugValuesPassOnce, std::ref(Registry)); } |
580 | false, false)static void *initializeLiveDebugValuesPassOnce(PassRegistry & Registry) { PassInfo *PI = new PassInfo( "Live DEBUG_VALUE analysis" , "livedebugvalues", &LiveDebugValues::ID, PassInfo::NormalCtor_t (callDefaultCtor<LiveDebugValues>), false, false); Registry .registerPass(*PI, true); return PI; } static llvm::once_flag InitializeLiveDebugValuesPassFlag; void llvm::initializeLiveDebugValuesPass (PassRegistry &Registry) { llvm::call_once(InitializeLiveDebugValuesPassFlag , initializeLiveDebugValuesPassOnce, std::ref(Registry)); } |
581 | |
582 | /// Default construct and initialize the pass. |
583 | LiveDebugValues::LiveDebugValues() : MachineFunctionPass(ID) { |
584 | initializeLiveDebugValuesPass(*PassRegistry::getPassRegistry()); |
585 | } |
586 | |
587 | /// Tell the pass manager which passes we depend on and what information we |
588 | /// preserve. |
589 | void LiveDebugValues::getAnalysisUsage(AnalysisUsage &AU) const { |
590 | AU.setPreservesCFG(); |
591 | MachineFunctionPass::getAnalysisUsage(AU); |
592 | } |
593 | |
594 | /// Erase a variable from the set of open ranges, and additionally erase any |
595 | /// fragments that may overlap it. |
596 | void LiveDebugValues::OpenRangesSet::erase(DebugVariable Var) { |
597 | // Erasure helper. |
598 | auto DoErase = [this](DebugVariable VarToErase) { |
599 | auto It = Vars.find(VarToErase); |
600 | if (It != Vars.end()) { |
601 | unsigned ID = It->second; |
602 | VarLocs.reset(ID); |
603 | Vars.erase(It); |
604 | } |
605 | }; |
606 | |
607 | // Erase the variable/fragment that ends here. |
608 | DoErase(Var); |
609 | |
610 | // Extract the fragment. Interpret an empty fragment as one that covers all |
611 | // possible bits. |
612 | FragmentInfo ThisFragment = Var.getFragmentDefault(); |
613 | |
614 | // There may be fragments that overlap the designated fragment. Look them up |
615 | // in the pre-computed overlap map, and erase them too. |
616 | auto MapIt = OverlappingFragments.find({Var.getVar(), ThisFragment}); |
617 | if (MapIt != OverlappingFragments.end()) { |
618 | for (auto Fragment : MapIt->second) { |
619 | LiveDebugValues::OptFragmentInfo FragmentHolder; |
620 | if (!DebugVariable::isFragmentDefault(Fragment)) |
621 | FragmentHolder = LiveDebugValues::OptFragmentInfo(Fragment); |
622 | DoErase({Var.getVar(), FragmentHolder, Var.getInlinedAt()}); |
623 | } |
624 | } |
625 | } |
626 | |
627 | //===----------------------------------------------------------------------===// |
628 | // Debug Range Extension Implementation |
629 | //===----------------------------------------------------------------------===// |
630 | |
631 | #ifndef NDEBUG |
632 | void LiveDebugValues::printVarLocInMBB(const MachineFunction &MF, |
633 | const VarLocInMBB &V, |
634 | const VarLocMap &VarLocIDs, |
635 | const char *msg, |
636 | raw_ostream &Out) const { |
637 | Out << '\n' << msg << '\n'; |
638 | for (const MachineBasicBlock &BB : MF) { |
639 | const VarLocSet &L = V.lookup(&BB); |
640 | if (L.empty()) |
641 | continue; |
642 | Out << "MBB: " << BB.getNumber() << ":\n"; |
643 | for (unsigned VLL : L) { |
644 | const VarLoc &VL = VarLocIDs[VLL]; |
645 | Out << " Var: " << VL.Var.getVar()->getName(); |
646 | Out << " MI: "; |
647 | VL.dump(TRI, Out); |
648 | } |
649 | } |
650 | Out << "\n"; |
651 | } |
652 | #endif |
653 | |
654 | LiveDebugValues::VarLoc::SpillLoc |
655 | LiveDebugValues::extractSpillBaseRegAndOffset(const MachineInstr &MI) { |
656 | assert(MI.hasOneMemOperand() &&((MI.hasOneMemOperand() && "Spill instruction does not have exactly one memory operand?" ) ? static_cast<void> (0) : __assert_fail ("MI.hasOneMemOperand() && \"Spill instruction does not have exactly one memory operand?\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 657, __PRETTY_FUNCTION__)) |
657 | "Spill instruction does not have exactly one memory operand?")((MI.hasOneMemOperand() && "Spill instruction does not have exactly one memory operand?" ) ? static_cast<void> (0) : __assert_fail ("MI.hasOneMemOperand() && \"Spill instruction does not have exactly one memory operand?\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 657, __PRETTY_FUNCTION__)); |
658 | auto MMOI = MI.memoperands_begin(); |
659 | const PseudoSourceValue *PVal = (*MMOI)->getPseudoValue(); |
660 | assert(PVal->kind() == PseudoSourceValue::FixedStack &&((PVal->kind() == PseudoSourceValue::FixedStack && "Inconsistent memory operand in spill instruction") ? static_cast <void> (0) : __assert_fail ("PVal->kind() == PseudoSourceValue::FixedStack && \"Inconsistent memory operand in spill instruction\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 661, __PRETTY_FUNCTION__)) |
661 | "Inconsistent memory operand in spill instruction")((PVal->kind() == PseudoSourceValue::FixedStack && "Inconsistent memory operand in spill instruction") ? static_cast <void> (0) : __assert_fail ("PVal->kind() == PseudoSourceValue::FixedStack && \"Inconsistent memory operand in spill instruction\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 661, __PRETTY_FUNCTION__)); |
662 | int FI = cast<FixedStackPseudoSourceValue>(PVal)->getFrameIndex(); |
663 | const MachineBasicBlock *MBB = MI.getParent(); |
664 | unsigned Reg; |
665 | int Offset = TFI->getFrameIndexReference(*MBB->getParent(), FI, Reg); |
666 | return {Reg, Offset}; |
667 | } |
668 | |
669 | /// End all previous ranges related to @MI and start a new range from @MI |
670 | /// if it is a DBG_VALUE instr. |
671 | void LiveDebugValues::transferDebugValue(const MachineInstr &MI, |
672 | OpenRangesSet &OpenRanges, |
673 | VarLocMap &VarLocIDs) { |
674 | if (!MI.isDebugValue()) |
675 | return; |
676 | const DILocalVariable *Var = MI.getDebugVariable(); |
677 | const DIExpression *Expr = MI.getDebugExpression(); |
678 | const DILocation *DebugLoc = MI.getDebugLoc(); |
679 | const DILocation *InlinedAt = DebugLoc->getInlinedAt(); |
680 | assert(Var->isValidLocationForIntrinsic(DebugLoc) &&((Var->isValidLocationForIntrinsic(DebugLoc) && "Expected inlined-at fields to agree" ) ? static_cast<void> (0) : __assert_fail ("Var->isValidLocationForIntrinsic(DebugLoc) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 681, __PRETTY_FUNCTION__)) |
681 | "Expected inlined-at fields to agree")((Var->isValidLocationForIntrinsic(DebugLoc) && "Expected inlined-at fields to agree" ) ? static_cast<void> (0) : __assert_fail ("Var->isValidLocationForIntrinsic(DebugLoc) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 681, __PRETTY_FUNCTION__)); |
682 | |
683 | // End all previous ranges of Var. |
684 | DebugVariable V(Var, Expr, InlinedAt); |
685 | OpenRanges.erase(V); |
686 | |
687 | // Add the VarLoc to OpenRanges from this DBG_VALUE. |
688 | unsigned ID; |
689 | if (isDbgValueDescribedByReg(MI) || MI.getOperand(0).isImm() || |
690 | MI.getOperand(0).isFPImm() || MI.getOperand(0).isCImm()) { |
691 | // Use normal VarLoc constructor for registers and immediates. |
692 | VarLoc VL(MI, LS); |
693 | ID = VarLocIDs.insert(VL); |
694 | OpenRanges.insert(ID, VL.Var); |
695 | } else if (MI.hasOneMemOperand()) { |
696 | 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-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 696); |
697 | } else { |
698 | // This must be an undefined location. We should leave OpenRanges closed. |
699 | assert(MI.getOperand(0).isReg() && MI.getOperand(0).getReg() == 0 &&((MI.getOperand(0).isReg() && MI.getOperand(0).getReg () == 0 && "Unexpected non-undef DBG_VALUE encountered" ) ? static_cast<void> (0) : __assert_fail ("MI.getOperand(0).isReg() && MI.getOperand(0).getReg() == 0 && \"Unexpected non-undef DBG_VALUE encountered\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 700, __PRETTY_FUNCTION__)) |
700 | "Unexpected non-undef DBG_VALUE encountered")((MI.getOperand(0).isReg() && MI.getOperand(0).getReg () == 0 && "Unexpected non-undef DBG_VALUE encountered" ) ? static_cast<void> (0) : __assert_fail ("MI.getOperand(0).isReg() && MI.getOperand(0).getReg() == 0 && \"Unexpected non-undef DBG_VALUE encountered\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 700, __PRETTY_FUNCTION__)); |
701 | } |
702 | } |
703 | |
704 | void LiveDebugValues::emitEntryValues(MachineInstr &MI, |
705 | OpenRangesSet &OpenRanges, |
706 | VarLocMap &VarLocIDs, |
707 | TransferMap &Transfers, |
708 | DebugParamMap &DebugEntryVals, |
709 | SparseBitVector<> &KillSet) { |
710 | for (unsigned ID : KillSet) { |
711 | if (!VarLocIDs[ID].Var.getVar()->isParameter()) |
712 | continue; |
713 | |
714 | const MachineInstr *CurrDebugInstr = &VarLocIDs[ID].MI; |
715 | |
716 | // If parameter's DBG_VALUE is not in the map that means we can't |
717 | // generate parameter's entry value. |
718 | if (!DebugEntryVals.count(CurrDebugInstr->getDebugVariable())) |
719 | continue; |
720 | |
721 | auto ParamDebugInstr = DebugEntryVals[CurrDebugInstr->getDebugVariable()]; |
722 | DIExpression *NewExpr = DIExpression::prepend( |
723 | ParamDebugInstr->getDebugExpression(), DIExpression::EntryValue); |
724 | |
725 | VarLoc EntryLoc = VarLoc::CreateEntryLoc(*ParamDebugInstr, LS, NewExpr); |
726 | |
727 | unsigned EntryValLocID = VarLocIDs.insert(EntryLoc); |
728 | Transfers.push_back({&MI, EntryValLocID}); |
729 | OpenRanges.insert(EntryValLocID, EntryLoc.Var); |
730 | } |
731 | } |
732 | |
733 | /// Create new TransferDebugPair and insert it in \p Transfers. The VarLoc |
734 | /// with \p OldVarID should be deleted form \p OpenRanges and replaced with |
735 | /// new VarLoc. If \p NewReg is different than default zero value then the |
736 | /// new location will be register location created by the copy like instruction, |
737 | /// otherwise it is variable's location on the stack. |
738 | void LiveDebugValues::insertTransferDebugPair( |
739 | MachineInstr &MI, OpenRangesSet &OpenRanges, TransferMap &Transfers, |
740 | VarLocMap &VarLocIDs, unsigned OldVarID, TransferKind Kind, |
741 | unsigned NewReg) { |
742 | const MachineInstr *DebugInstr = &VarLocIDs[OldVarID].MI; |
743 | |
744 | auto ProcessVarLoc = [&MI, &OpenRanges, &Transfers, &DebugInstr, |
745 | &VarLocIDs](VarLoc &VL) { |
746 | unsigned LocId = VarLocIDs.insert(VL); |
747 | |
748 | // Close this variable's previous location range. |
749 | DebugVariable V(*DebugInstr); |
750 | OpenRanges.erase(V); |
751 | |
752 | // Record the new location as an open range, and a postponed transfer |
753 | // inserting a DBG_VALUE for this location. |
754 | OpenRanges.insert(LocId, VL.Var); |
755 | TransferDebugPair MIP = {&MI, LocId}; |
756 | Transfers.push_back(MIP); |
757 | }; |
758 | |
759 | // End all previous ranges of Var. |
760 | OpenRanges.erase(VarLocIDs[OldVarID].Var); |
761 | switch (Kind) { |
762 | case TransferKind::TransferCopy: { |
763 | assert(NewReg &&((NewReg && "No register supplied when handling a copy of a debug value" ) ? static_cast<void> (0) : __assert_fail ("NewReg && \"No register supplied when handling a copy of a debug value\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 764, __PRETTY_FUNCTION__)) |
764 | "No register supplied when handling a copy of a debug value")((NewReg && "No register supplied when handling a copy of a debug value" ) ? static_cast<void> (0) : __assert_fail ("NewReg && \"No register supplied when handling a copy of a debug value\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 764, __PRETTY_FUNCTION__)); |
765 | // Create a DBG_VALUE instruction to describe the Var in its new |
766 | // register location. |
767 | VarLoc VL = VarLoc::CreateCopyLoc(*DebugInstr, LS, NewReg); |
768 | ProcessVarLoc(VL); |
769 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
770 | dbgs() << "Creating VarLoc for register copy:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
771 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false) |
772 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for register copy:" ; VL.dump(TRI); }; } } while (false); |
773 | return; |
774 | } |
775 | case TransferKind::TransferSpill: { |
776 | // Create a DBG_VALUE instruction to describe the Var in its spilled |
777 | // location. |
778 | VarLoc::SpillLoc SpillLocation = extractSpillBaseRegAndOffset(MI); |
779 | VarLoc VL = VarLoc::CreateSpillLoc(*DebugInstr, SpillLocation.SpillBase, |
780 | SpillLocation.SpillOffset, LS); |
781 | ProcessVarLoc(VL); |
782 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
783 | dbgs() << "Creating VarLoc for spill:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
784 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false) |
785 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for spill:" ; VL.dump(TRI); }; } } while (false); |
786 | return; |
787 | } |
788 | case TransferKind::TransferRestore: { |
789 | assert(NewReg &&((NewReg && "No register supplied when handling a restore of a debug value" ) ? static_cast<void> (0) : __assert_fail ("NewReg && \"No register supplied when handling a restore of a debug value\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 790, __PRETTY_FUNCTION__)) |
790 | "No register supplied when handling a restore of a debug value")((NewReg && "No register supplied when handling a restore of a debug value" ) ? static_cast<void> (0) : __assert_fail ("NewReg && \"No register supplied when handling a restore of a debug value\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 790, __PRETTY_FUNCTION__)); |
791 | MachineFunction *MF = MI.getMF(); |
792 | DIBuilder DIB(*const_cast<Function &>(MF->getFunction()).getParent()); |
793 | // DebugInstr refers to the pre-spill location, therefore we can reuse |
794 | // its expression. |
795 | VarLoc VL = VarLoc::CreateCopyLoc(*DebugInstr, LS, NewReg); |
796 | ProcessVarLoc(VL); |
797 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
798 | dbgs() << "Creating VarLoc for restore:";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
799 | VL.dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false) |
800 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { dbgs() << "Creating VarLoc for restore:" ; VL.dump(TRI); }; } } while (false); |
801 | return; |
802 | } |
803 | } |
804 | llvm_unreachable("Invalid transfer kind")::llvm::llvm_unreachable_internal("Invalid transfer kind", "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 804); |
805 | } |
806 | |
807 | /// A definition of a register may mark the end of a range. |
808 | void LiveDebugValues::transferRegisterDef( |
809 | MachineInstr &MI, OpenRangesSet &OpenRanges, VarLocMap &VarLocIDs, |
810 | TransferMap &Transfers, DebugParamMap &DebugEntryVals) { |
811 | MachineFunction *MF = MI.getMF(); |
812 | const TargetLowering *TLI = MF->getSubtarget().getTargetLowering(); |
813 | unsigned SP = TLI->getStackPointerRegisterToSaveRestore(); |
814 | SparseBitVector<> KillSet; |
815 | for (const MachineOperand &MO : MI.operands()) { |
816 | // Determine whether the operand is a register def. Assume that call |
817 | // instructions never clobber SP, because some backends (e.g., AArch64) |
818 | // never list SP in the regmask. |
819 | if (MO.isReg() && MO.isDef() && MO.getReg() && |
820 | Register::isPhysicalRegister(MO.getReg()) && |
821 | !(MI.isCall() && MO.getReg() == SP)) { |
822 | // Remove ranges of all aliased registers. |
823 | for (MCRegAliasIterator RAI(MO.getReg(), TRI, true); RAI.isValid(); ++RAI) |
824 | for (unsigned ID : OpenRanges.getVarLocs()) |
825 | if (VarLocIDs[ID].isDescribedByReg() == *RAI) |
826 | KillSet.set(ID); |
827 | } else if (MO.isRegMask()) { |
828 | // Remove ranges of all clobbered registers. Register masks don't usually |
829 | // list SP as preserved. While the debug info may be off for an |
830 | // instruction or two around callee-cleanup calls, transferring the |
831 | // DEBUG_VALUE across the call is still a better user experience. |
832 | for (unsigned ID : OpenRanges.getVarLocs()) { |
833 | unsigned Reg = VarLocIDs[ID].isDescribedByReg(); |
834 | if (Reg && Reg != SP && MO.clobbersPhysReg(Reg)) |
835 | KillSet.set(ID); |
836 | } |
837 | } |
838 | } |
839 | OpenRanges.erase(KillSet, VarLocIDs); |
840 | |
841 | if (auto *TPC = getAnalysisIfAvailable<TargetPassConfig>()) { |
842 | auto &TM = TPC->getTM<TargetMachine>(); |
843 | if (TM.Options.EnableDebugEntryValues) |
844 | emitEntryValues(MI, OpenRanges, VarLocIDs, Transfers, DebugEntryVals, |
845 | KillSet); |
846 | } |
847 | } |
848 | |
849 | bool LiveDebugValues::isSpillInstruction(const MachineInstr &MI, |
850 | MachineFunction *MF) { |
851 | // TODO: Handle multiple stores folded into one. |
852 | if (!MI.hasOneMemOperand()) |
853 | return false; |
854 | |
855 | if (!MI.getSpillSize(TII) && !MI.getFoldedSpillSize(TII)) |
856 | return false; // This is not a spill instruction, since no valid size was |
857 | // returned from either function. |
858 | |
859 | return true; |
860 | } |
861 | |
862 | bool LiveDebugValues::isLocationSpill(const MachineInstr &MI, |
863 | MachineFunction *MF, unsigned &Reg) { |
864 | if (!isSpillInstruction(MI, MF)) |
865 | return false; |
866 | |
867 | auto isKilledReg = [&](const MachineOperand MO, unsigned &Reg) { |
868 | if (!MO.isReg() || !MO.isUse()) { |
869 | Reg = 0; |
870 | return false; |
871 | } |
872 | Reg = MO.getReg(); |
873 | return MO.isKill(); |
874 | }; |
875 | |
876 | for (const MachineOperand &MO : MI.operands()) { |
877 | // In a spill instruction generated by the InlineSpiller the spilled |
878 | // register has its kill flag set. |
879 | if (isKilledReg(MO, Reg)) |
880 | return true; |
881 | if (Reg != 0) { |
882 | // Check whether next instruction kills the spilled register. |
883 | // FIXME: Current solution does not cover search for killed register in |
884 | // bundles and instructions further down the chain. |
885 | auto NextI = std::next(MI.getIterator()); |
886 | // Skip next instruction that points to basic block end iterator. |
887 | if (MI.getParent()->end() == NextI) |
888 | continue; |
889 | unsigned RegNext; |
890 | for (const MachineOperand &MONext : NextI->operands()) { |
891 | // Return true if we came across the register from the |
892 | // previous spill instruction that is killed in NextI. |
893 | if (isKilledReg(MONext, RegNext) && RegNext == Reg) |
894 | return true; |
895 | } |
896 | } |
897 | } |
898 | // Return false if we didn't find spilled register. |
899 | return false; |
900 | } |
901 | |
902 | Optional<LiveDebugValues::VarLoc::SpillLoc> |
903 | LiveDebugValues::isRestoreInstruction(const MachineInstr &MI, |
904 | MachineFunction *MF, unsigned &Reg) { |
905 | if (!MI.hasOneMemOperand()) |
906 | return None; |
907 | |
908 | // FIXME: Handle folded restore instructions with more than one memory |
909 | // operand. |
910 | if (MI.getRestoreSize(TII)) { |
911 | Reg = MI.getOperand(0).getReg(); |
912 | return extractSpillBaseRegAndOffset(MI); |
913 | } |
914 | return None; |
915 | } |
916 | |
917 | /// A spilled register may indicate that we have to end the current range of |
918 | /// a variable and create a new one for the spill location. |
919 | /// A restored register may indicate the reverse situation. |
920 | /// We don't want to insert any instructions in process(), so we just create |
921 | /// the DBG_VALUE without inserting it and keep track of it in \p Transfers. |
922 | /// It will be inserted into the BB when we're done iterating over the |
923 | /// instructions. |
924 | void LiveDebugValues::transferSpillOrRestoreInst(MachineInstr &MI, |
925 | OpenRangesSet &OpenRanges, |
926 | VarLocMap &VarLocIDs, |
927 | TransferMap &Transfers) { |
928 | MachineFunction *MF = MI.getMF(); |
929 | TransferKind TKind; |
930 | unsigned Reg; |
931 | Optional<VarLoc::SpillLoc> Loc; |
932 | |
933 | LLVM_DEBUG(dbgs() << "Examining instruction: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Examining instruction: " ; MI.dump();; } } while (false); |
934 | |
935 | // First, if there are any DBG_VALUEs pointing at a spill slot that is |
936 | // written to, then close the variable location. The value in memory |
937 | // will have changed. |
938 | VarLocSet KillSet; |
939 | if (isSpillInstruction(MI, MF)) { |
940 | Loc = extractSpillBaseRegAndOffset(MI); |
941 | for (unsigned ID : OpenRanges.getVarLocs()) { |
942 | const VarLoc &VL = VarLocIDs[ID]; |
943 | if (VL.Kind == VarLoc::SpillLocKind && VL.Loc.SpillLocation == *Loc) { |
944 | // This location is overwritten by the current instruction -- terminate |
945 | // the open range, and insert an explicit DBG_VALUE $noreg. |
946 | // |
947 | // Doing this at a later stage would require re-interpreting all |
948 | // DBG_VALUes and DIExpressions to identify whether they point at |
949 | // memory, and then analysing all memory writes to see if they |
950 | // overwrite that memory, which is expensive. |
951 | // |
952 | // At this stage, we already know which DBG_VALUEs are for spills and |
953 | // where they are located; it's best to fix handle overwrites now. |
954 | KillSet.set(ID); |
955 | VarLoc UndefVL = VarLoc::CreateCopyLoc(VL.MI, LS, 0); |
956 | unsigned UndefLocID = VarLocIDs.insert(UndefVL); |
957 | Transfers.push_back({&MI, UndefLocID}); |
958 | } |
959 | } |
960 | OpenRanges.erase(KillSet, VarLocIDs); |
961 | } |
962 | |
963 | // Try to recognise spill and restore instructions that may create a new |
964 | // variable location. |
965 | if (isLocationSpill(MI, MF, Reg)) { |
966 | TKind = TransferKind::TransferSpill; |
967 | LLVM_DEBUG(dbgs() << "Recognized as spill: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Recognized as spill: " ; MI.dump();; } } while (false); |
968 | LLVM_DEBUG(dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false) |
969 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false); |
970 | } else { |
971 | if (!(Loc = isRestoreInstruction(MI, MF, Reg))) |
972 | return; |
973 | TKind = TransferKind::TransferRestore; |
974 | LLVM_DEBUG(dbgs() << "Recognized as restore: "; MI.dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Recognized as restore: " ; MI.dump();; } } while (false); |
975 | LLVM_DEBUG(dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false) |
976 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Register: " << Reg << " " << printReg(Reg, TRI) << "\n"; } } while (false); |
977 | } |
978 | // Check if the register or spill location is the location of a debug value. |
979 | for (unsigned ID : OpenRanges.getVarLocs()) { |
980 | if (TKind == TransferKind::TransferSpill && |
981 | VarLocIDs[ID].isDescribedByReg() == Reg) { |
982 | LLVM_DEBUG(dbgs() << "Spilling Register " << printReg(Reg, TRI) << '('do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Spilling Register " << printReg(Reg, TRI) << '(' << VarLocIDs[ID].Var.getVar ()->getName() << ")\n"; } } while (false) |
983 | << VarLocIDs[ID].Var.getVar()->getName() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Spilling Register " << printReg(Reg, TRI) << '(' << VarLocIDs[ID].Var.getVar ()->getName() << ")\n"; } } while (false); |
984 | } else if (TKind == TransferKind::TransferRestore && |
985 | VarLocIDs[ID].Kind == VarLoc::SpillLocKind && |
986 | VarLocIDs[ID].Loc.SpillLocation == *Loc) { |
987 | LLVM_DEBUG(dbgs() << "Restoring Register " << printReg(Reg, TRI) << '('do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Restoring Register " << printReg(Reg, TRI) << '(' << VarLocIDs[ID].Var.getVar ()->getName() << ")\n"; } } while (false) |
988 | << VarLocIDs[ID].Var.getVar()->getName() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Restoring Register " << printReg(Reg, TRI) << '(' << VarLocIDs[ID].Var.getVar ()->getName() << ")\n"; } } while (false); |
989 | } else |
990 | continue; |
991 | insertTransferDebugPair(MI, OpenRanges, Transfers, VarLocIDs, ID, TKind, |
992 | Reg); |
993 | return; |
994 | } |
995 | } |
996 | |
997 | /// If \p MI is a register copy instruction, that copies a previously tracked |
998 | /// value from one register to another register that is callee saved, we |
999 | /// create new DBG_VALUE instruction described with copy destination register. |
1000 | void LiveDebugValues::transferRegisterCopy(MachineInstr &MI, |
1001 | OpenRangesSet &OpenRanges, |
1002 | VarLocMap &VarLocIDs, |
1003 | TransferMap &Transfers) { |
1004 | const MachineOperand *SrcRegOp, *DestRegOp; |
1005 | |
1006 | if (!TII->isCopyInstr(MI, SrcRegOp, DestRegOp) || !SrcRegOp->isKill() || |
1007 | !DestRegOp->isDef()) |
1008 | return; |
1009 | |
1010 | auto isCalleSavedReg = [&](unsigned Reg) { |
1011 | for (MCRegAliasIterator RAI(Reg, TRI, true); RAI.isValid(); ++RAI) |
1012 | if (CalleeSavedRegs.test(*RAI)) |
1013 | return true; |
1014 | return false; |
1015 | }; |
1016 | |
1017 | Register SrcReg = SrcRegOp->getReg(); |
1018 | Register DestReg = DestRegOp->getReg(); |
1019 | |
1020 | // We want to recognize instructions where destination register is callee |
1021 | // saved register. If register that could be clobbered by the call is |
1022 | // included, there would be a great chance that it is going to be clobbered |
1023 | // soon. It is more likely that previous register location, which is callee |
1024 | // saved, is going to stay unclobbered longer, even if it is killed. |
1025 | if (!isCalleSavedReg(DestReg)) |
1026 | return; |
1027 | |
1028 | for (unsigned ID : OpenRanges.getVarLocs()) { |
1029 | if (VarLocIDs[ID].isDescribedByReg() == SrcReg) { |
1030 | insertTransferDebugPair(MI, OpenRanges, Transfers, VarLocIDs, ID, |
1031 | TransferKind::TransferCopy, DestReg); |
1032 | return; |
1033 | } |
1034 | } |
1035 | } |
1036 | |
1037 | /// Terminate all open ranges at the end of the current basic block. |
1038 | bool LiveDebugValues::transferTerminator(MachineBasicBlock *CurMBB, |
1039 | OpenRangesSet &OpenRanges, |
1040 | VarLocInMBB &OutLocs, |
1041 | const VarLocMap &VarLocIDs) { |
1042 | bool Changed = false; |
1043 | |
1044 | LLVM_DEBUG(for (unsigned IDdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false) |
1045 | : OpenRanges.getVarLocs()) {do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false) |
1046 | // Copy OpenRanges to OutLocs, if not already present.do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false) |
1047 | dbgs() << "Add to OutLocs in MBB #" << CurMBB->getNumber() << ": ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false) |
1048 | VarLocIDs[ID].dump(TRI);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false) |
1049 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { for (unsigned ID : OpenRanges.getVarLocs ()) { dbgs() << "Add to OutLocs in MBB #" << CurMBB ->getNumber() << ": "; VarLocIDs[ID].dump(TRI); }; } } while (false); |
1050 | VarLocSet &VLS = OutLocs[CurMBB]; |
1051 | Changed = VLS != OpenRanges.getVarLocs(); |
1052 | // New OutLocs set may be different due to spill, restore or register |
1053 | // copy instruction processing. |
1054 | if (Changed) |
1055 | VLS = OpenRanges.getVarLocs(); |
1056 | OpenRanges.clear(); |
1057 | return Changed; |
1058 | } |
1059 | |
1060 | /// Accumulate a mapping between each DILocalVariable fragment and other |
1061 | /// fragments of that DILocalVariable which overlap. This reduces work during |
1062 | /// the data-flow stage from "Find any overlapping fragments" to "Check if the |
1063 | /// known-to-overlap fragments are present". |
1064 | /// \param MI A previously unprocessed DEBUG_VALUE instruction to analyze for |
1065 | /// fragment usage. |
1066 | /// \param SeenFragments Map from DILocalVariable to all fragments of that |
1067 | /// Variable which are known to exist. |
1068 | /// \param OverlappingFragments The overlap map being constructed, from one |
1069 | /// Var/Fragment pair to a vector of fragments known to overlap. |
1070 | void LiveDebugValues::accumulateFragmentMap(MachineInstr &MI, |
1071 | VarToFragments &SeenFragments, |
1072 | OverlapMap &OverlappingFragments) { |
1073 | DebugVariable MIVar(MI); |
1074 | FragmentInfo ThisFragment = MIVar.getFragmentDefault(); |
1075 | |
1076 | // If this is the first sighting of this variable, then we are guaranteed |
1077 | // there are currently no overlapping fragments either. Initialize the set |
1078 | // of seen fragments, record no overlaps for the current one, and return. |
1079 | auto SeenIt = SeenFragments.find(MIVar.getVar()); |
1080 | if (SeenIt == SeenFragments.end()) { |
1081 | SmallSet<FragmentInfo, 4> OneFragment; |
1082 | OneFragment.insert(ThisFragment); |
1083 | SeenFragments.insert({MIVar.getVar(), OneFragment}); |
1084 | |
1085 | OverlappingFragments.insert({{MIVar.getVar(), ThisFragment}, {}}); |
1086 | return; |
1087 | } |
1088 | |
1089 | // If this particular Variable/Fragment pair already exists in the overlap |
1090 | // map, it has already been accounted for. |
1091 | auto IsInOLapMap = |
1092 | OverlappingFragments.insert({{MIVar.getVar(), ThisFragment}, {}}); |
1093 | if (!IsInOLapMap.second) |
1094 | return; |
1095 | |
1096 | auto &ThisFragmentsOverlaps = IsInOLapMap.first->second; |
1097 | auto &AllSeenFragments = SeenIt->second; |
1098 | |
1099 | // Otherwise, examine all other seen fragments for this variable, with "this" |
1100 | // fragment being a previously unseen fragment. Record any pair of |
1101 | // overlapping fragments. |
1102 | for (auto &ASeenFragment : AllSeenFragments) { |
1103 | // Does this previously seen fragment overlap? |
1104 | if (DIExpression::fragmentsOverlap(ThisFragment, ASeenFragment)) { |
1105 | // Yes: Mark the current fragment as being overlapped. |
1106 | ThisFragmentsOverlaps.push_back(ASeenFragment); |
1107 | // Mark the previously seen fragment as being overlapped by the current |
1108 | // one. |
1109 | auto ASeenFragmentsOverlaps = |
1110 | OverlappingFragments.find({MIVar.getVar(), ASeenFragment}); |
1111 | assert(ASeenFragmentsOverlaps != OverlappingFragments.end() &&((ASeenFragmentsOverlaps != OverlappingFragments.end() && "Previously seen var fragment has no vector of overlaps") ? static_cast <void> (0) : __assert_fail ("ASeenFragmentsOverlaps != OverlappingFragments.end() && \"Previously seen var fragment has no vector of overlaps\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 1112, __PRETTY_FUNCTION__)) |
1112 | "Previously seen var fragment has no vector of overlaps")((ASeenFragmentsOverlaps != OverlappingFragments.end() && "Previously seen var fragment has no vector of overlaps") ? static_cast <void> (0) : __assert_fail ("ASeenFragmentsOverlaps != OverlappingFragments.end() && \"Previously seen var fragment has no vector of overlaps\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 1112, __PRETTY_FUNCTION__)); |
1113 | ASeenFragmentsOverlaps->second.push_back(ThisFragment); |
1114 | } |
1115 | } |
1116 | |
1117 | AllSeenFragments.insert(ThisFragment); |
1118 | } |
1119 | |
1120 | /// This routine creates OpenRanges and OutLocs. |
1121 | void LiveDebugValues::process(MachineInstr &MI, OpenRangesSet &OpenRanges, |
1122 | VarLocInMBB &OutLocs, VarLocMap &VarLocIDs, |
1123 | TransferMap &Transfers, |
1124 | DebugParamMap &DebugEntryVals, |
1125 | OverlapMap &OverlapFragments, |
1126 | VarToFragments &SeenFragments) { |
1127 | transferDebugValue(MI, OpenRanges, VarLocIDs); |
1128 | transferRegisterDef(MI, OpenRanges, VarLocIDs, Transfers, |
1129 | DebugEntryVals); |
1130 | transferRegisterCopy(MI, OpenRanges, VarLocIDs, Transfers); |
1131 | transferSpillOrRestoreInst(MI, OpenRanges, VarLocIDs, Transfers); |
1132 | } |
1133 | |
1134 | /// This routine joins the analysis results of all incoming edges in @MBB by |
1135 | /// inserting a new DBG_VALUE instruction at the start of the @MBB - if the same |
1136 | /// source variable in all the predecessors of @MBB reside in the same location. |
1137 | bool LiveDebugValues::join( |
1138 | MachineBasicBlock &MBB, VarLocInMBB &OutLocs, VarLocInMBB &InLocs, |
1139 | const VarLocMap &VarLocIDs, |
1140 | SmallPtrSet<const MachineBasicBlock *, 16> &Visited, |
1141 | SmallPtrSetImpl<const MachineBasicBlock *> &ArtificialBlocks, |
1142 | VarLocInMBB &PendingInLocs) { |
1143 | LLVM_DEBUG(dbgs() << "join MBB: " << MBB.getNumber() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "join MBB: " << MBB .getNumber() << "\n"; } } while (false); |
1144 | bool Changed = false; |
1145 | |
1146 | VarLocSet InLocsT; // Temporary incoming locations. |
1147 | |
1148 | // For all predecessors of this MBB, find the set of VarLocs that |
1149 | // can be joined. |
1150 | int NumVisited = 0; |
1151 | for (auto p : MBB.predecessors()) { |
1152 | // Ignore backedges if we have not visited the predecessor yet. As the |
1153 | // predecessor hasn't yet had locations propagated into it, most locations |
1154 | // will not yet be valid, so treat them as all being uninitialized and |
1155 | // potentially valid. If a location guessed to be correct here is |
1156 | // invalidated later, we will remove it when we revisit this block. |
1157 | if (!Visited.count(p)) { |
1158 | 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) |
1159 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << " ignoring unvisited pred MBB: " << p->getNumber() << "\n"; } } while (false); |
1160 | continue; |
1161 | } |
1162 | auto OL = OutLocs.find(p); |
1163 | // Join is null in case of empty OutLocs from any of the pred. |
1164 | if (OL == OutLocs.end()) |
1165 | return false; |
1166 | |
1167 | // Just copy over the Out locs to incoming locs for the first visited |
1168 | // predecessor, and for all other predecessors join the Out locs. |
1169 | if (!NumVisited) |
1170 | InLocsT = OL->second; |
1171 | else |
1172 | InLocsT &= OL->second; |
1173 | |
1174 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1175 | if (!InLocsT.empty()) {do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1176 | for (auto ID : InLocsT)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1177 | dbgs() << " gathered candidate incoming var: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1178 | << VarLocIDs[ID].Var.getVar()->getName() << "\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1179 | }do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false) |
1180 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { if (!InLocsT.empty()) { for (auto ID : InLocsT) dbgs() << " gathered candidate incoming var: " << VarLocIDs[ID].Var.getVar()->getName() << "\n" ; } }; } } while (false); |
1181 | |
1182 | NumVisited++; |
1183 | } |
1184 | |
1185 | // Filter out DBG_VALUES that are out of scope. |
1186 | VarLocSet KillSet; |
1187 | bool IsArtificial = ArtificialBlocks.count(&MBB); |
1188 | if (!IsArtificial) { |
1189 | for (auto ID : InLocsT) { |
1190 | if (!VarLocIDs[ID].dominates(MBB)) { |
1191 | KillSet.set(ID); |
1192 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[ID].Var.getVar ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
1193 | auto Name = VarLocIDs[ID].Var.getVar()->getName();do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[ID].Var.getVar ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
1194 | dbgs() << " killing " << Name << ", it doesn't dominate MBB\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[ID].Var.getVar ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false) |
1195 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { { auto Name = VarLocIDs[ID].Var.getVar ()->getName(); dbgs() << " killing " << Name << ", it doesn't dominate MBB\n"; }; } } while (false); |
1196 | } |
1197 | } |
1198 | } |
1199 | InLocsT.intersectWithComplement(KillSet); |
1200 | |
1201 | // As we are processing blocks in reverse post-order we |
1202 | // should have processed at least one predecessor, unless it |
1203 | // is the entry block which has no predecessor. |
1204 | assert((NumVisited || MBB.pred_empty()) &&(((NumVisited || MBB.pred_empty()) && "Should have processed at least one predecessor" ) ? static_cast<void> (0) : __assert_fail ("(NumVisited || MBB.pred_empty()) && \"Should have processed at least one predecessor\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 1205, __PRETTY_FUNCTION__)) |
1205 | "Should have processed at least one predecessor")(((NumVisited || MBB.pred_empty()) && "Should have processed at least one predecessor" ) ? static_cast<void> (0) : __assert_fail ("(NumVisited || MBB.pred_empty()) && \"Should have processed at least one predecessor\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 1205, __PRETTY_FUNCTION__)); |
1206 | |
1207 | VarLocSet &ILS = InLocs[&MBB]; |
1208 | VarLocSet &Pending = PendingInLocs[&MBB]; |
1209 | |
1210 | // New locations will have DBG_VALUE insts inserted at the start of the |
1211 | // block, after location propagation has finished. Record the insertions |
1212 | // that we need to perform in the Pending set. |
1213 | VarLocSet Diff = InLocsT; |
1214 | Diff.intersectWithComplement(ILS); |
1215 | for (auto ID : Diff) { |
1216 | Pending.set(ID); |
1217 | ILS.set(ID); |
1218 | ++NumInserted; |
1219 | Changed = true; |
1220 | } |
1221 | |
1222 | // We may have lost locations by learning about a predecessor that either |
1223 | // loses or moves a variable. Find any locations in ILS that are not in the |
1224 | // new in-locations, and delete those. |
1225 | VarLocSet Removed = ILS; |
1226 | Removed.intersectWithComplement(InLocsT); |
1227 | for (auto ID : Removed) { |
1228 | Pending.reset(ID); |
1229 | ILS.reset(ID); |
1230 | ++NumRemoved; |
1231 | Changed = true; |
1232 | } |
1233 | |
1234 | return Changed; |
1235 | } |
1236 | |
1237 | void LiveDebugValues::flushPendingLocs(VarLocInMBB &PendingInLocs, |
1238 | VarLocMap &VarLocIDs) { |
1239 | // PendingInLocs records all locations propagated into blocks, which have |
1240 | // not had DBG_VALUE insts created. Go through and create those insts now. |
1241 | for (auto &Iter : PendingInLocs) { |
1242 | // Map is keyed on a constant pointer, unwrap it so we can insert insts. |
1243 | auto &MBB = const_cast<MachineBasicBlock &>(*Iter.first); |
1244 | VarLocSet &Pending = Iter.second; |
1245 | |
1246 | for (unsigned ID : Pending) { |
1247 | // The ID location is live-in to MBB -- work out what kind of machine |
1248 | // location it is and create a DBG_VALUE. |
1249 | const VarLoc &DiffIt = VarLocIDs[ID]; |
1250 | MachineInstr *MI = DiffIt.BuildDbgValue(*MBB.getParent()); |
1251 | MBB.insert(MBB.instr_begin(), MI); |
1252 | |
1253 | (void)MI; |
1254 | LLVM_DEBUG(dbgs() << "Inserted: "; MI->dump();)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Inserted: "; MI->dump ();; } } while (false); |
1255 | } |
1256 | } |
1257 | } |
1258 | |
1259 | /// Calculate the liveness information for the given machine function and |
1260 | /// extend ranges across basic blocks. |
1261 | bool LiveDebugValues::ExtendRanges(MachineFunction &MF) { |
1262 | LLVM_DEBUG(dbgs() << "\nDebug Range Extension\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "\nDebug Range Extension\n" ; } } while (false); |
1263 | |
1264 | bool Changed = false; |
1265 | bool OLChanged = false; |
1266 | bool MBBJoined = false; |
1267 | |
1268 | VarLocMap VarLocIDs; // Map VarLoc<>unique ID for use in bitvectors. |
1269 | OverlapMap OverlapFragments; // Map of overlapping variable fragments |
1270 | OpenRangesSet OpenRanges(OverlapFragments); |
1271 | // Ranges that are open until end of bb. |
1272 | VarLocInMBB OutLocs; // Ranges that exist beyond bb. |
1273 | VarLocInMBB InLocs; // Ranges that are incoming after joining. |
1274 | TransferMap Transfers; // DBG_VALUEs associated with spills. |
1275 | VarLocInMBB PendingInLocs; // Ranges that are incoming after joining, but |
1276 | // that we have deferred creating DBG_VALUE insts |
1277 | // for immediately. |
1278 | |
1279 | VarToFragments SeenFragments; |
1280 | |
1281 | // Blocks which are artificial, i.e. blocks which exclusively contain |
1282 | // instructions without locations, or with line 0 locations. |
1283 | SmallPtrSet<const MachineBasicBlock *, 16> ArtificialBlocks; |
1284 | |
1285 | DenseMap<unsigned int, MachineBasicBlock *> OrderToBB; |
1286 | DenseMap<MachineBasicBlock *, unsigned int> BBToOrder; |
1287 | std::priority_queue<unsigned int, std::vector<unsigned int>, |
1288 | std::greater<unsigned int>> |
1289 | Worklist; |
1290 | std::priority_queue<unsigned int, std::vector<unsigned int>, |
1291 | std::greater<unsigned int>> |
1292 | Pending; |
1293 | |
1294 | // Besides parameter's modification, check whether a DBG_VALUE is inlined |
1295 | // in order to deduce whether the variable that it tracks comes from |
1296 | // a different function. If that is the case we can't track its entry value. |
1297 | auto IsUnmodifiedFuncParam = [&](const MachineInstr &MI) { |
1298 | auto *DIVar = MI.getDebugVariable(); |
1299 | return DIVar->isParameter() && DIVar->isNotModified() && |
1300 | !MI.getDebugLoc()->getInlinedAt(); |
1301 | }; |
1302 | |
1303 | const TargetLowering *TLI = MF.getSubtarget().getTargetLowering(); |
1304 | unsigned SP = TLI->getStackPointerRegisterToSaveRestore(); |
1305 | Register FP = TRI->getFrameRegister(MF); |
1306 | auto IsRegOtherThanSPAndFP = [&](const MachineOperand &Op) -> bool { |
1307 | return Op.isReg() && Op.getReg() != SP && Op.getReg() != FP; |
1308 | }; |
1309 | |
1310 | // Working set of currently collected debug variables mapped to DBG_VALUEs |
1311 | // representing candidates for production of debug entry values. |
1312 | DebugParamMap DebugEntryVals; |
1313 | |
1314 | MachineBasicBlock &First_MBB = *(MF.begin()); |
1315 | // Only in the case of entry MBB collect DBG_VALUEs representing |
1316 | // function parameters in order to generate debug entry values for them. |
1317 | // Currently, we generate debug entry values only for parameters that are |
1318 | // unmodified throughout the function and located in a register. |
1319 | // TODO: Add support for parameters that are described as fragments. |
1320 | // TODO: Add support for modified arguments that can be expressed |
1321 | // by using its entry value. |
1322 | // TODO: Add support for local variables that are expressed in terms of |
1323 | // parameters entry values. |
1324 | for (auto &MI : First_MBB) |
1325 | if (MI.isDebugValue() && IsUnmodifiedFuncParam(MI) && |
1326 | !MI.isIndirectDebugValue() && IsRegOtherThanSPAndFP(MI.getOperand(0)) && |
1327 | !DebugEntryVals.count(MI.getDebugVariable()) && |
1328 | !MI.getDebugExpression()->isFragment()) |
1329 | DebugEntryVals[MI.getDebugVariable()] = &MI; |
1330 | |
1331 | // Initialize per-block structures and scan for fragment overlaps. |
1332 | for (auto &MBB : MF) { |
1333 | PendingInLocs[&MBB] = VarLocSet(); |
1334 | |
1335 | for (auto &MI : MBB) { |
1336 | if (MI.isDebugValue()) |
1337 | accumulateFragmentMap(MI, SeenFragments, OverlapFragments); |
1338 | } |
1339 | } |
1340 | |
1341 | auto hasNonArtificialLocation = [](const MachineInstr &MI) -> bool { |
1342 | if (const DebugLoc &DL = MI.getDebugLoc()) |
1343 | return DL.getLine() != 0; |
1344 | return false; |
1345 | }; |
1346 | for (auto &MBB : MF) |
1347 | if (none_of(MBB.instrs(), hasNonArtificialLocation)) |
1348 | ArtificialBlocks.insert(&MBB); |
1349 | |
1350 | LLVM_DEBUG(printVarLocInMBB(MF, OutLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after initialization", dbgs()); } } while (false) |
1351 | "OutLocs after initialization", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after initialization", dbgs()); } } while (false); |
1352 | |
1353 | ReversePostOrderTraversal<MachineFunction *> RPOT(&MF); |
1354 | unsigned int RPONumber = 0; |
1355 | for (auto RI = RPOT.begin(), RE = RPOT.end(); RI != RE; ++RI) { |
1356 | OrderToBB[RPONumber] = *RI; |
1357 | BBToOrder[*RI] = RPONumber; |
1358 | Worklist.push(RPONumber); |
1359 | ++RPONumber; |
1360 | } |
1361 | // This is a standard "union of predecessor outs" dataflow problem. |
1362 | // To solve it, we perform join() and process() using the two worklist method |
1363 | // until the ranges converge. |
1364 | // Ranges have converged when both worklists are empty. |
1365 | SmallPtrSet<const MachineBasicBlock *, 16> Visited; |
1366 | while (!Worklist.empty() || !Pending.empty()) { |
1367 | // We track what is on the pending worklist to avoid inserting the same |
1368 | // thing twice. We could avoid this with a custom priority queue, but this |
1369 | // is probably not worth it. |
1370 | SmallPtrSet<MachineBasicBlock *, 16> OnPending; |
1371 | LLVM_DEBUG(dbgs() << "Processing Worklist\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { dbgs() << "Processing Worklist\n" ; } } while (false); |
1372 | while (!Worklist.empty()) { |
1373 | MachineBasicBlock *MBB = OrderToBB[Worklist.top()]; |
1374 | Worklist.pop(); |
1375 | MBBJoined = join(*MBB, OutLocs, InLocs, VarLocIDs, Visited, |
1376 | ArtificialBlocks, PendingInLocs); |
1377 | MBBJoined |= Visited.insert(MBB).second; |
1378 | if (MBBJoined) { |
1379 | MBBJoined = false; |
Value stored to 'MBBJoined' is never read | |
1380 | Changed = true; |
1381 | // Now that we have started to extend ranges across BBs we need to |
1382 | // examine spill instructions to see whether they spill registers that |
1383 | // correspond to user variables. |
1384 | // First load any pending inlocs. |
1385 | OpenRanges.insertFromLocSet(PendingInLocs[MBB], VarLocIDs); |
1386 | for (auto &MI : *MBB) |
1387 | process(MI, OpenRanges, OutLocs, VarLocIDs, Transfers, |
1388 | DebugEntryVals, OverlapFragments, SeenFragments); |
1389 | OLChanged |= transferTerminator(MBB, OpenRanges, OutLocs, VarLocIDs); |
1390 | |
1391 | LLVM_DEBUG(printVarLocInMBB(MF, OutLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after propagating", dbgs()); } } while (false) |
1392 | "OutLocs after propagating", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, OutLocs, VarLocIDs , "OutLocs after propagating", dbgs()); } } while (false); |
1393 | LLVM_DEBUG(printVarLocInMBB(MF, InLocs, VarLocIDs,do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, InLocs, VarLocIDs , "InLocs after propagating", dbgs()); } } while (false) |
1394 | "InLocs after propagating", dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvalues")) { printVarLocInMBB(MF, InLocs, VarLocIDs , "InLocs after propagating", dbgs()); } } while (false); |
1395 | |
1396 | if (OLChanged) { |
1397 | OLChanged = false; |
1398 | for (auto s : MBB->successors()) |
1399 | if (OnPending.insert(s).second) { |
1400 | Pending.push(BBToOrder[s]); |
1401 | } |
1402 | } |
1403 | } |
1404 | } |
1405 | Worklist.swap(Pending); |
1406 | // At this point, pending must be empty, since it was just the empty |
1407 | // worklist |
1408 | assert(Pending.empty() && "Pending should be empty")((Pending.empty() && "Pending should be empty") ? static_cast <void> (0) : __assert_fail ("Pending.empty() && \"Pending should be empty\"" , "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugValues.cpp" , 1408, __PRETTY_FUNCTION__)); |
1409 | } |
1410 | |
1411 | // Add any DBG_VALUE instructions created by location transfers. |
1412 | for (auto &TR : Transfers) { |
1413 | MachineBasicBlock *MBB = TR.TransferInst->getParent(); |
1414 | const VarLoc &VL = VarLocIDs[TR.LocationID]; |
1415 | MachineInstr *MI = VL.BuildDbgValue(MF); |
1416 | MBB->insertAfterBundle(TR.TransferInst->getIterator(), MI); |
1417 | } |
1418 | Transfers.clear(); |
1419 | |
1420 | // Deferred inlocs will not have had any DBG_VALUE insts created; do |
1421 | // that now. |
1422 | flushPendingLocs(PendingInLocs, VarLocIDs); |
1423 | |
1424 | 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); |
1425 | 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); |
1426 | return Changed; |
1427 | } |
1428 | |
1429 | bool LiveDebugValues::runOnMachineFunction(MachineFunction &MF) { |
1430 | if (!MF.getFunction().getSubprogram()) |
1431 | // LiveDebugValues will already have removed all DBG_VALUEs. |
1432 | return false; |
1433 | |
1434 | // Skip functions from NoDebug compilation units. |
1435 | if (MF.getFunction().getSubprogram()->getUnit()->getEmissionKind() == |
1436 | DICompileUnit::NoDebug) |
1437 | return false; |
1438 | |
1439 | TRI = MF.getSubtarget().getRegisterInfo(); |
1440 | TII = MF.getSubtarget().getInstrInfo(); |
1441 | TFI = MF.getSubtarget().getFrameLowering(); |
1442 | TFI->determineCalleeSaves(MF, CalleeSavedRegs, |
1443 | std::make_unique<RegScavenger>().get()); |
1444 | LS.initialize(MF); |
1445 | |
1446 | bool Changed = ExtendRanges(MF); |
1447 | return Changed; |
1448 | } |