File: | lib/CodeGen/LiveDebugVariables.cpp |
Warning: | line 749, column 5 Value stored to 'ToEnd' is never read |
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1 | //===- LiveDebugVariables.cpp - Tracking debug info variables -------------===// |
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 file implements the LiveDebugVariables analysis. |
10 | // |
11 | // Remove all DBG_VALUE instructions referencing virtual registers and replace |
12 | // them with a data structure tracking where live user variables are kept - in a |
13 | // virtual register or in a stack slot. |
14 | // |
15 | // Allow the data structure to be updated during register allocation when values |
16 | // are moved between registers and stack slots. Finally emit new DBG_VALUE |
17 | // instructions after register allocation is complete. |
18 | // |
19 | //===----------------------------------------------------------------------===// |
20 | |
21 | #include "LiveDebugVariables.h" |
22 | #include "llvm/ADT/ArrayRef.h" |
23 | #include "llvm/ADT/DenseMap.h" |
24 | #include "llvm/ADT/IntervalMap.h" |
25 | #include "llvm/ADT/MapVector.h" |
26 | #include "llvm/ADT/STLExtras.h" |
27 | #include "llvm/ADT/SmallSet.h" |
28 | #include "llvm/ADT/SmallVector.h" |
29 | #include "llvm/ADT/Statistic.h" |
30 | #include "llvm/ADT/StringRef.h" |
31 | #include "llvm/CodeGen/LexicalScopes.h" |
32 | #include "llvm/CodeGen/LiveInterval.h" |
33 | #include "llvm/CodeGen/LiveIntervals.h" |
34 | #include "llvm/CodeGen/MachineBasicBlock.h" |
35 | #include "llvm/CodeGen/MachineDominators.h" |
36 | #include "llvm/CodeGen/MachineFunction.h" |
37 | #include "llvm/CodeGen/MachineInstr.h" |
38 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
39 | #include "llvm/CodeGen/MachineOperand.h" |
40 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
41 | #include "llvm/CodeGen/SlotIndexes.h" |
42 | #include "llvm/CodeGen/TargetInstrInfo.h" |
43 | #include "llvm/CodeGen/TargetOpcodes.h" |
44 | #include "llvm/CodeGen/TargetRegisterInfo.h" |
45 | #include "llvm/CodeGen/TargetSubtargetInfo.h" |
46 | #include "llvm/CodeGen/VirtRegMap.h" |
47 | #include "llvm/Config/llvm-config.h" |
48 | #include "llvm/IR/DebugInfoMetadata.h" |
49 | #include "llvm/IR/DebugLoc.h" |
50 | #include "llvm/IR/Function.h" |
51 | #include "llvm/IR/Metadata.h" |
52 | #include "llvm/MC/MCRegisterInfo.h" |
53 | #include "llvm/Pass.h" |
54 | #include "llvm/Support/Casting.h" |
55 | #include "llvm/Support/CommandLine.h" |
56 | #include "llvm/Support/Compiler.h" |
57 | #include "llvm/Support/Debug.h" |
58 | #include "llvm/Support/raw_ostream.h" |
59 | #include <algorithm> |
60 | #include <cassert> |
61 | #include <iterator> |
62 | #include <memory> |
63 | #include <utility> |
64 | |
65 | using namespace llvm; |
66 | |
67 | #define DEBUG_TYPE"livedebugvars" "livedebugvars" |
68 | |
69 | static cl::opt<bool> |
70 | EnableLDV("live-debug-variables", cl::init(true), |
71 | cl::desc("Enable the live debug variables pass"), cl::Hidden); |
72 | |
73 | STATISTIC(NumInsertedDebugValues, "Number of DBG_VALUEs inserted")static llvm::Statistic NumInsertedDebugValues = {"livedebugvars" , "NumInsertedDebugValues", "Number of DBG_VALUEs inserted", { 0}, {false}}; |
74 | STATISTIC(NumInsertedDebugLabels, "Number of DBG_LABELs inserted")static llvm::Statistic NumInsertedDebugLabels = {"livedebugvars" , "NumInsertedDebugLabels", "Number of DBG_LABELs inserted", { 0}, {false}}; |
75 | |
76 | char LiveDebugVariables::ID = 0; |
77 | |
78 | INITIALIZE_PASS_BEGIN(LiveDebugVariables, DEBUG_TYPE,static void *initializeLiveDebugVariablesPassOnce(PassRegistry &Registry) { |
79 | "Debug Variable Analysis", false, false)static void *initializeLiveDebugVariablesPassOnce(PassRegistry &Registry) { |
80 | INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)initializeMachineDominatorTreePass(Registry); |
81 | INITIALIZE_PASS_DEPENDENCY(LiveIntervals)initializeLiveIntervalsPass(Registry); |
82 | INITIALIZE_PASS_END(LiveDebugVariables, DEBUG_TYPE,PassInfo *PI = new PassInfo( "Debug Variable Analysis", "livedebugvars" , &LiveDebugVariables::ID, PassInfo::NormalCtor_t(callDefaultCtor <LiveDebugVariables>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeLiveDebugVariablesPassFlag ; void llvm::initializeLiveDebugVariablesPass(PassRegistry & Registry) { llvm::call_once(InitializeLiveDebugVariablesPassFlag , initializeLiveDebugVariablesPassOnce, std::ref(Registry)); } |
83 | "Debug Variable Analysis", false, false)PassInfo *PI = new PassInfo( "Debug Variable Analysis", "livedebugvars" , &LiveDebugVariables::ID, PassInfo::NormalCtor_t(callDefaultCtor <LiveDebugVariables>), false, false); Registry.registerPass (*PI, true); return PI; } static llvm::once_flag InitializeLiveDebugVariablesPassFlag ; void llvm::initializeLiveDebugVariablesPass(PassRegistry & Registry) { llvm::call_once(InitializeLiveDebugVariablesPassFlag , initializeLiveDebugVariablesPassOnce, std::ref(Registry)); } |
84 | |
85 | void LiveDebugVariables::getAnalysisUsage(AnalysisUsage &AU) const { |
86 | AU.addRequired<MachineDominatorTree>(); |
87 | AU.addRequiredTransitive<LiveIntervals>(); |
88 | AU.setPreservesAll(); |
89 | MachineFunctionPass::getAnalysisUsage(AU); |
90 | } |
91 | |
92 | LiveDebugVariables::LiveDebugVariables() : MachineFunctionPass(ID) { |
93 | initializeLiveDebugVariablesPass(*PassRegistry::getPassRegistry()); |
94 | } |
95 | |
96 | enum : unsigned { UndefLocNo = ~0U }; |
97 | |
98 | /// Describes a location by number along with some flags about the original |
99 | /// usage of the location. |
100 | class DbgValueLocation { |
101 | public: |
102 | DbgValueLocation(unsigned LocNo, bool WasIndirect) |
103 | : LocNo(LocNo), WasIndirect(WasIndirect) { |
104 | static_assert(sizeof(*this) == sizeof(unsigned), "bad bitfield packing"); |
105 | assert(locNo() == LocNo && "location truncation")((locNo() == LocNo && "location truncation") ? static_cast <void> (0) : __assert_fail ("locNo() == LocNo && \"location truncation\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 105, __PRETTY_FUNCTION__)); |
106 | } |
107 | |
108 | DbgValueLocation() : LocNo(0), WasIndirect(0) {} |
109 | |
110 | unsigned locNo() const { |
111 | // Fix up the undef location number, which gets truncated. |
112 | return LocNo == INT_MAX2147483647 ? UndefLocNo : LocNo; |
113 | } |
114 | bool wasIndirect() const { return WasIndirect; } |
115 | bool isUndef() const { return locNo() == UndefLocNo; } |
116 | |
117 | DbgValueLocation changeLocNo(unsigned NewLocNo) const { |
118 | return DbgValueLocation(NewLocNo, WasIndirect); |
119 | } |
120 | |
121 | friend inline bool operator==(const DbgValueLocation &LHS, |
122 | const DbgValueLocation &RHS) { |
123 | return LHS.LocNo == RHS.LocNo && LHS.WasIndirect == RHS.WasIndirect; |
124 | } |
125 | |
126 | friend inline bool operator!=(const DbgValueLocation &LHS, |
127 | const DbgValueLocation &RHS) { |
128 | return !(LHS == RHS); |
129 | } |
130 | |
131 | private: |
132 | unsigned LocNo : 31; |
133 | unsigned WasIndirect : 1; |
134 | }; |
135 | |
136 | /// Map of where a user value is live, and its location. |
137 | using LocMap = IntervalMap<SlotIndex, DbgValueLocation, 4>; |
138 | |
139 | /// Map of stack slot offsets for spilled locations. |
140 | /// Non-spilled locations are not added to the map. |
141 | using SpillOffsetMap = DenseMap<unsigned, unsigned>; |
142 | |
143 | namespace { |
144 | |
145 | class LDVImpl; |
146 | |
147 | /// A user value is a part of a debug info user variable. |
148 | /// |
149 | /// A DBG_VALUE instruction notes that (a sub-register of) a virtual register |
150 | /// holds part of a user variable. The part is identified by a byte offset. |
151 | /// |
152 | /// UserValues are grouped into equivalence classes for easier searching. Two |
153 | /// user values are related if they refer to the same variable, or if they are |
154 | /// held by the same virtual register. The equivalence class is the transitive |
155 | /// closure of that relation. |
156 | class UserValue { |
157 | const DILocalVariable *Variable; ///< The debug info variable we are part of. |
158 | const DIExpression *Expression; ///< Any complex address expression. |
159 | DebugLoc dl; ///< The debug location for the variable. This is |
160 | ///< used by dwarf writer to find lexical scope. |
161 | UserValue *leader; ///< Equivalence class leader. |
162 | UserValue *next = nullptr; ///< Next value in equivalence class, or null. |
163 | |
164 | /// Numbered locations referenced by locmap. |
165 | SmallVector<MachineOperand, 4> locations; |
166 | |
167 | /// Map of slot indices where this value is live. |
168 | LocMap locInts; |
169 | |
170 | /// Set of interval start indexes that have been trimmed to the |
171 | /// lexical scope. |
172 | SmallSet<SlotIndex, 2> trimmedDefs; |
173 | |
174 | /// Insert a DBG_VALUE into MBB at Idx for LocNo. |
175 | void insertDebugValue(MachineBasicBlock *MBB, SlotIndex StartIdx, |
176 | SlotIndex StopIdx, DbgValueLocation Loc, bool Spilled, |
177 | unsigned SpillOffset, LiveIntervals &LIS, |
178 | const TargetInstrInfo &TII, |
179 | const TargetRegisterInfo &TRI); |
180 | |
181 | /// Replace OldLocNo ranges with NewRegs ranges where NewRegs |
182 | /// is live. Returns true if any changes were made. |
183 | bool splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs, |
184 | LiveIntervals &LIS); |
185 | |
186 | public: |
187 | /// Create a new UserValue. |
188 | UserValue(const DILocalVariable *var, const DIExpression *expr, DebugLoc L, |
189 | LocMap::Allocator &alloc) |
190 | : Variable(var), Expression(expr), dl(std::move(L)), leader(this), |
191 | locInts(alloc) {} |
192 | |
193 | /// Get the leader of this value's equivalence class. |
194 | UserValue *getLeader() { |
195 | UserValue *l = leader; |
196 | while (l != l->leader) |
197 | l = l->leader; |
198 | return leader = l; |
199 | } |
200 | |
201 | /// Return the next UserValue in the equivalence class. |
202 | UserValue *getNext() const { return next; } |
203 | |
204 | /// Does this UserValue match the parameters? |
205 | bool match(const DILocalVariable *Var, const DIExpression *Expr, |
206 | const DILocation *IA) const { |
207 | // FIXME: The fragment should be part of the equivalence class, but not |
208 | // other things in the expression like stack values. |
209 | return Var == Variable && Expr == Expression && dl->getInlinedAt() == IA; |
210 | } |
211 | |
212 | /// Merge equivalence classes. |
213 | static UserValue *merge(UserValue *L1, UserValue *L2) { |
214 | L2 = L2->getLeader(); |
215 | if (!L1) |
216 | return L2; |
217 | L1 = L1->getLeader(); |
218 | if (L1 == L2) |
219 | return L1; |
220 | // Splice L2 before L1's members. |
221 | UserValue *End = L2; |
222 | while (End->next) { |
223 | End->leader = L1; |
224 | End = End->next; |
225 | } |
226 | End->leader = L1; |
227 | End->next = L1->next; |
228 | L1->next = L2; |
229 | return L1; |
230 | } |
231 | |
232 | /// Return the location number that matches Loc. |
233 | /// |
234 | /// For undef values we always return location number UndefLocNo without |
235 | /// inserting anything in locations. Since locations is a vector and the |
236 | /// location number is the position in the vector and UndefLocNo is ~0, |
237 | /// we would need a very big vector to put the value at the right position. |
238 | unsigned getLocationNo(const MachineOperand &LocMO) { |
239 | if (LocMO.isReg()) { |
240 | if (LocMO.getReg() == 0) |
241 | return UndefLocNo; |
242 | // For register locations we dont care about use/def and other flags. |
243 | for (unsigned i = 0, e = locations.size(); i != e; ++i) |
244 | if (locations[i].isReg() && |
245 | locations[i].getReg() == LocMO.getReg() && |
246 | locations[i].getSubReg() == LocMO.getSubReg()) |
247 | return i; |
248 | } else |
249 | for (unsigned i = 0, e = locations.size(); i != e; ++i) |
250 | if (LocMO.isIdenticalTo(locations[i])) |
251 | return i; |
252 | locations.push_back(LocMO); |
253 | // We are storing a MachineOperand outside a MachineInstr. |
254 | locations.back().clearParent(); |
255 | // Don't store def operands. |
256 | if (locations.back().isReg()) { |
257 | if (locations.back().isDef()) |
258 | locations.back().setIsDead(false); |
259 | locations.back().setIsUse(); |
260 | } |
261 | return locations.size() - 1; |
262 | } |
263 | |
264 | /// Ensure that all virtual register locations are mapped. |
265 | void mapVirtRegs(LDVImpl *LDV); |
266 | |
267 | /// Add a definition point to this value. |
268 | void addDef(SlotIndex Idx, const MachineOperand &LocMO, bool IsIndirect) { |
269 | DbgValueLocation Loc(getLocationNo(LocMO), IsIndirect); |
270 | // Add a singular (Idx,Idx) -> Loc mapping. |
271 | LocMap::iterator I = locInts.find(Idx); |
272 | if (!I.valid() || I.start() != Idx) |
273 | I.insert(Idx, Idx.getNextSlot(), Loc); |
274 | else |
275 | // A later DBG_VALUE at the same SlotIndex overrides the old location. |
276 | I.setValue(Loc); |
277 | } |
278 | |
279 | /// Extend the current definition as far as possible down. |
280 | /// |
281 | /// Stop when meeting an existing def or when leaving the live |
282 | /// range of VNI. End points where VNI is no longer live are added to Kills. |
283 | /// |
284 | /// We only propagate DBG_VALUES locally here. LiveDebugValues performs a |
285 | /// data-flow analysis to propagate them beyond basic block boundaries. |
286 | /// |
287 | /// \param Idx Starting point for the definition. |
288 | /// \param Loc Location number to propagate. |
289 | /// \param LR Restrict liveness to where LR has the value VNI. May be null. |
290 | /// \param VNI When LR is not null, this is the value to restrict to. |
291 | /// \param [out] Kills Append end points of VNI's live range to Kills. |
292 | /// \param LIS Live intervals analysis. |
293 | void extendDef(SlotIndex Idx, DbgValueLocation Loc, |
294 | LiveRange *LR, const VNInfo *VNI, |
295 | SmallVectorImpl<SlotIndex> *Kills, |
296 | LiveIntervals &LIS); |
297 | |
298 | /// The value in LI/LocNo may be copies to other registers. Determine if |
299 | /// any of the copies are available at the kill points, and add defs if |
300 | /// possible. |
301 | /// |
302 | /// \param LI Scan for copies of the value in LI->reg. |
303 | /// \param LocNo Location number of LI->reg. |
304 | /// \param WasIndirect Indicates if the original use of LI->reg was indirect |
305 | /// \param Kills Points where the range of LocNo could be extended. |
306 | /// \param [in,out] NewDefs Append (Idx, LocNo) of inserted defs here. |
307 | void addDefsFromCopies( |
308 | LiveInterval *LI, unsigned LocNo, bool WasIndirect, |
309 | const SmallVectorImpl<SlotIndex> &Kills, |
310 | SmallVectorImpl<std::pair<SlotIndex, DbgValueLocation>> &NewDefs, |
311 | MachineRegisterInfo &MRI, LiveIntervals &LIS); |
312 | |
313 | /// Compute the live intervals of all locations after collecting all their |
314 | /// def points. |
315 | void computeIntervals(MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI, |
316 | LiveIntervals &LIS, LexicalScopes &LS); |
317 | |
318 | /// Replace OldReg ranges with NewRegs ranges where NewRegs is |
319 | /// live. Returns true if any changes were made. |
320 | bool splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, |
321 | LiveIntervals &LIS); |
322 | |
323 | /// Rewrite virtual register locations according to the provided virtual |
324 | /// register map. Record the stack slot offsets for the locations that |
325 | /// were spilled. |
326 | void rewriteLocations(VirtRegMap &VRM, const MachineFunction &MF, |
327 | const TargetInstrInfo &TII, |
328 | const TargetRegisterInfo &TRI, |
329 | SpillOffsetMap &SpillOffsets); |
330 | |
331 | /// Recreate DBG_VALUE instruction from data structures. |
332 | void emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS, |
333 | const TargetInstrInfo &TII, |
334 | const TargetRegisterInfo &TRI, |
335 | const SpillOffsetMap &SpillOffsets); |
336 | |
337 | /// Return DebugLoc of this UserValue. |
338 | DebugLoc getDebugLoc() { return dl;} |
339 | |
340 | void print(raw_ostream &, const TargetRegisterInfo *); |
341 | }; |
342 | |
343 | /// A user label is a part of a debug info user label. |
344 | class UserLabel { |
345 | const DILabel *Label; ///< The debug info label we are part of. |
346 | DebugLoc dl; ///< The debug location for the label. This is |
347 | ///< used by dwarf writer to find lexical scope. |
348 | SlotIndex loc; ///< Slot used by the debug label. |
349 | |
350 | /// Insert a DBG_LABEL into MBB at Idx. |
351 | void insertDebugLabel(MachineBasicBlock *MBB, SlotIndex Idx, |
352 | LiveIntervals &LIS, const TargetInstrInfo &TII); |
353 | |
354 | public: |
355 | /// Create a new UserLabel. |
356 | UserLabel(const DILabel *label, DebugLoc L, SlotIndex Idx) |
357 | : Label(label), dl(std::move(L)), loc(Idx) {} |
358 | |
359 | /// Does this UserLabel match the parameters? |
360 | bool match(const DILabel *L, const DILocation *IA, |
361 | const SlotIndex Index) const { |
362 | return Label == L && dl->getInlinedAt() == IA && loc == Index; |
363 | } |
364 | |
365 | /// Recreate DBG_LABEL instruction from data structures. |
366 | void emitDebugLabel(LiveIntervals &LIS, const TargetInstrInfo &TII); |
367 | |
368 | /// Return DebugLoc of this UserLabel. |
369 | DebugLoc getDebugLoc() { return dl; } |
370 | |
371 | void print(raw_ostream &, const TargetRegisterInfo *); |
372 | }; |
373 | |
374 | /// Implementation of the LiveDebugVariables pass. |
375 | class LDVImpl { |
376 | LiveDebugVariables &pass; |
377 | LocMap::Allocator allocator; |
378 | MachineFunction *MF = nullptr; |
379 | LiveIntervals *LIS; |
380 | const TargetRegisterInfo *TRI; |
381 | |
382 | /// Whether emitDebugValues is called. |
383 | bool EmitDone = false; |
384 | |
385 | /// Whether the machine function is modified during the pass. |
386 | bool ModifiedMF = false; |
387 | |
388 | /// All allocated UserValue instances. |
389 | SmallVector<std::unique_ptr<UserValue>, 8> userValues; |
390 | |
391 | /// All allocated UserLabel instances. |
392 | SmallVector<std::unique_ptr<UserLabel>, 2> userLabels; |
393 | |
394 | /// Map virtual register to eq class leader. |
395 | using VRMap = DenseMap<unsigned, UserValue *>; |
396 | VRMap virtRegToEqClass; |
397 | |
398 | /// Map user variable to eq class leader. |
399 | using UVMap = DenseMap<const DILocalVariable *, UserValue *>; |
400 | UVMap userVarMap; |
401 | |
402 | /// Find or create a UserValue. |
403 | UserValue *getUserValue(const DILocalVariable *Var, const DIExpression *Expr, |
404 | const DebugLoc &DL); |
405 | |
406 | /// Find the EC leader for VirtReg or null. |
407 | UserValue *lookupVirtReg(unsigned VirtReg); |
408 | |
409 | /// Add DBG_VALUE instruction to our maps. |
410 | /// |
411 | /// \param MI DBG_VALUE instruction |
412 | /// \param Idx Last valid SLotIndex before instruction. |
413 | /// |
414 | /// \returns True if the DBG_VALUE instruction should be deleted. |
415 | bool handleDebugValue(MachineInstr &MI, SlotIndex Idx); |
416 | |
417 | /// Add DBG_LABEL instruction to UserLabel. |
418 | /// |
419 | /// \param MI DBG_LABEL instruction |
420 | /// \param Idx Last valid SlotIndex before instruction. |
421 | /// |
422 | /// \returns True if the DBG_LABEL instruction should be deleted. |
423 | bool handleDebugLabel(MachineInstr &MI, SlotIndex Idx); |
424 | |
425 | /// Collect and erase all DBG_VALUE instructions, adding a UserValue def |
426 | /// for each instruction. |
427 | /// |
428 | /// \param mf MachineFunction to be scanned. |
429 | /// |
430 | /// \returns True if any debug values were found. |
431 | bool collectDebugValues(MachineFunction &mf); |
432 | |
433 | /// Compute the live intervals of all user values after collecting all |
434 | /// their def points. |
435 | void computeIntervals(); |
436 | |
437 | public: |
438 | LDVImpl(LiveDebugVariables *ps) : pass(*ps) {} |
439 | |
440 | bool runOnMachineFunction(MachineFunction &mf); |
441 | |
442 | /// Release all memory. |
443 | void clear() { |
444 | MF = nullptr; |
445 | userValues.clear(); |
446 | userLabels.clear(); |
447 | virtRegToEqClass.clear(); |
448 | userVarMap.clear(); |
449 | // Make sure we call emitDebugValues if the machine function was modified. |
450 | assert((!ModifiedMF || EmitDone) &&(((!ModifiedMF || EmitDone) && "Dbg values are not emitted in LDV" ) ? static_cast<void> (0) : __assert_fail ("(!ModifiedMF || EmitDone) && \"Dbg values are not emitted in LDV\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 451, __PRETTY_FUNCTION__)) |
451 | "Dbg values are not emitted in LDV")(((!ModifiedMF || EmitDone) && "Dbg values are not emitted in LDV" ) ? static_cast<void> (0) : __assert_fail ("(!ModifiedMF || EmitDone) && \"Dbg values are not emitted in LDV\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 451, __PRETTY_FUNCTION__)); |
452 | EmitDone = false; |
453 | ModifiedMF = false; |
454 | } |
455 | |
456 | /// Map virtual register to an equivalence class. |
457 | void mapVirtReg(unsigned VirtReg, UserValue *EC); |
458 | |
459 | /// Replace all references to OldReg with NewRegs. |
460 | void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs); |
461 | |
462 | /// Recreate DBG_VALUE instruction from data structures. |
463 | void emitDebugValues(VirtRegMap *VRM); |
464 | |
465 | void print(raw_ostream&); |
466 | }; |
467 | |
468 | } // end anonymous namespace |
469 | |
470 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
471 | static void printDebugLoc(const DebugLoc &DL, raw_ostream &CommentOS, |
472 | const LLVMContext &Ctx) { |
473 | if (!DL) |
474 | return; |
475 | |
476 | auto *Scope = cast<DIScope>(DL.getScope()); |
477 | // Omit the directory, because it's likely to be long and uninteresting. |
478 | CommentOS << Scope->getFilename(); |
479 | CommentOS << ':' << DL.getLine(); |
480 | if (DL.getCol() != 0) |
481 | CommentOS << ':' << DL.getCol(); |
482 | |
483 | DebugLoc InlinedAtDL = DL.getInlinedAt(); |
484 | if (!InlinedAtDL) |
485 | return; |
486 | |
487 | CommentOS << " @[ "; |
488 | printDebugLoc(InlinedAtDL, CommentOS, Ctx); |
489 | CommentOS << " ]"; |
490 | } |
491 | |
492 | static void printExtendedName(raw_ostream &OS, const DINode *Node, |
493 | const DILocation *DL) { |
494 | const LLVMContext &Ctx = Node->getContext(); |
495 | StringRef Res; |
496 | unsigned Line; |
497 | if (const auto *V = dyn_cast<const DILocalVariable>(Node)) { |
498 | Res = V->getName(); |
499 | Line = V->getLine(); |
500 | } else if (const auto *L = dyn_cast<const DILabel>(Node)) { |
501 | Res = L->getName(); |
502 | Line = L->getLine(); |
503 | } |
504 | |
505 | if (!Res.empty()) |
506 | OS << Res << "," << Line; |
507 | auto *InlinedAt = DL ? DL->getInlinedAt() : nullptr; |
508 | if (InlinedAt) { |
509 | if (DebugLoc InlinedAtDL = InlinedAt) { |
510 | OS << " @["; |
511 | printDebugLoc(InlinedAtDL, OS, Ctx); |
512 | OS << "]"; |
513 | } |
514 | } |
515 | } |
516 | |
517 | void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) { |
518 | OS << "!\""; |
519 | printExtendedName(OS, Variable, dl); |
520 | |
521 | OS << "\"\t"; |
522 | for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) { |
523 | OS << " [" << I.start() << ';' << I.stop() << "):"; |
524 | if (I.value().isUndef()) |
525 | OS << "undef"; |
526 | else { |
527 | OS << I.value().locNo(); |
528 | if (I.value().wasIndirect()) |
529 | OS << " ind"; |
530 | } |
531 | } |
532 | for (unsigned i = 0, e = locations.size(); i != e; ++i) { |
533 | OS << " Loc" << i << '='; |
534 | locations[i].print(OS, TRI); |
535 | } |
536 | OS << '\n'; |
537 | } |
538 | |
539 | void UserLabel::print(raw_ostream &OS, const TargetRegisterInfo *TRI) { |
540 | OS << "!\""; |
541 | printExtendedName(OS, Label, dl); |
542 | |
543 | OS << "\"\t"; |
544 | OS << loc; |
545 | OS << '\n'; |
546 | } |
547 | |
548 | void LDVImpl::print(raw_ostream &OS) { |
549 | OS << "********** DEBUG VARIABLES **********\n"; |
550 | for (auto &userValue : userValues) |
551 | userValue->print(OS, TRI); |
552 | OS << "********** DEBUG LABELS **********\n"; |
553 | for (auto &userLabel : userLabels) |
554 | userLabel->print(OS, TRI); |
555 | } |
556 | #endif |
557 | |
558 | void UserValue::mapVirtRegs(LDVImpl *LDV) { |
559 | for (unsigned i = 0, e = locations.size(); i != e; ++i) |
560 | if (locations[i].isReg() && |
561 | TargetRegisterInfo::isVirtualRegister(locations[i].getReg())) |
562 | LDV->mapVirtReg(locations[i].getReg(), this); |
563 | } |
564 | |
565 | UserValue *LDVImpl::getUserValue(const DILocalVariable *Var, |
566 | const DIExpression *Expr, const DebugLoc &DL) { |
567 | UserValue *&Leader = userVarMap[Var]; |
568 | if (Leader) { |
569 | UserValue *UV = Leader->getLeader(); |
570 | Leader = UV; |
571 | for (; UV; UV = UV->getNext()) |
572 | if (UV->match(Var, Expr, DL->getInlinedAt())) |
573 | return UV; |
574 | } |
575 | |
576 | userValues.push_back( |
577 | llvm::make_unique<UserValue>(Var, Expr, DL, allocator)); |
578 | UserValue *UV = userValues.back().get(); |
579 | Leader = UserValue::merge(Leader, UV); |
580 | return UV; |
581 | } |
582 | |
583 | void LDVImpl::mapVirtReg(unsigned VirtReg, UserValue *EC) { |
584 | assert(TargetRegisterInfo::isVirtualRegister(VirtReg) && "Only map VirtRegs")((TargetRegisterInfo::isVirtualRegister(VirtReg) && "Only map VirtRegs" ) ? static_cast<void> (0) : __assert_fail ("TargetRegisterInfo::isVirtualRegister(VirtReg) && \"Only map VirtRegs\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 584, __PRETTY_FUNCTION__)); |
585 | UserValue *&Leader = virtRegToEqClass[VirtReg]; |
586 | Leader = UserValue::merge(Leader, EC); |
587 | } |
588 | |
589 | UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) { |
590 | if (UserValue *UV = virtRegToEqClass.lookup(VirtReg)) |
591 | return UV->getLeader(); |
592 | return nullptr; |
593 | } |
594 | |
595 | bool LDVImpl::handleDebugValue(MachineInstr &MI, SlotIndex Idx) { |
596 | // DBG_VALUE loc, offset, variable |
597 | if (MI.getNumOperands() != 4 || |
598 | !(MI.getOperand(1).isReg() || MI.getOperand(1).isImm()) || |
599 | !MI.getOperand(2).isMetadata()) { |
600 | LLVM_DEBUG(dbgs() << "Can't handle " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Can't handle " << MI; } } while (false); |
601 | return false; |
602 | } |
603 | |
604 | // Detect invalid DBG_VALUE instructions, with a debug-use of a virtual |
605 | // register that hasn't been defined yet. If we do not remove those here, then |
606 | // the re-insertion of the DBG_VALUE instruction after register allocation |
607 | // will be incorrect. |
608 | // TODO: If earlier passes are corrected to generate sane debug information |
609 | // (and if the machine verifier is improved to catch this), then these checks |
610 | // could be removed or replaced by asserts. |
611 | bool Discard = false; |
612 | if (MI.getOperand(0).isReg() && |
613 | TargetRegisterInfo::isVirtualRegister(MI.getOperand(0).getReg())) { |
614 | const unsigned Reg = MI.getOperand(0).getReg(); |
615 | if (!LIS->hasInterval(Reg)) { |
616 | // The DBG_VALUE is described by a virtual register that does not have a |
617 | // live interval. Discard the DBG_VALUE. |
618 | Discard = true; |
619 | LLVM_DEBUG(dbgs() << "Discarding debug info (no LIS interval): " << Idxdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Discarding debug info (no LIS interval): " << Idx << " " << MI; } } while (false) |
620 | << " " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Discarding debug info (no LIS interval): " << Idx << " " << MI; } } while (false); |
621 | } else { |
622 | // The DBG_VALUE is only valid if either Reg is live out from Idx, or Reg |
623 | // is defined dead at Idx (where Idx is the slot index for the instruction |
624 | // preceding the DBG_VALUE). |
625 | const LiveInterval &LI = LIS->getInterval(Reg); |
626 | LiveQueryResult LRQ = LI.Query(Idx); |
627 | if (!LRQ.valueOutOrDead()) { |
628 | // We have found a DBG_VALUE with the value in a virtual register that |
629 | // is not live. Discard the DBG_VALUE. |
630 | Discard = true; |
631 | LLVM_DEBUG(dbgs() << "Discarding debug info (reg not live): " << Idxdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Discarding debug info (reg not live): " << Idx << " " << MI; } } while (false) |
632 | << " " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Discarding debug info (reg not live): " << Idx << " " << MI; } } while (false); |
633 | } |
634 | } |
635 | } |
636 | |
637 | // Get or create the UserValue for (variable,offset) here. |
638 | bool IsIndirect = MI.getOperand(1).isImm(); |
639 | if (IsIndirect) |
640 | assert(MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset")((MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset" ) ? static_cast<void> (0) : __assert_fail ("MI.getOperand(1).getImm() == 0 && \"DBG_VALUE with nonzero offset\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 640, __PRETTY_FUNCTION__)); |
641 | const DILocalVariable *Var = MI.getDebugVariable(); |
642 | const DIExpression *Expr = MI.getDebugExpression(); |
643 | UserValue *UV = |
644 | getUserValue(Var, Expr, MI.getDebugLoc()); |
645 | if (!Discard) |
646 | UV->addDef(Idx, MI.getOperand(0), IsIndirect); |
647 | else { |
648 | MachineOperand MO = MachineOperand::CreateReg(0U, false); |
649 | MO.setIsDebug(); |
650 | UV->addDef(Idx, MO, false); |
651 | } |
652 | return true; |
653 | } |
654 | |
655 | bool LDVImpl::handleDebugLabel(MachineInstr &MI, SlotIndex Idx) { |
656 | // DBG_LABEL label |
657 | if (MI.getNumOperands() != 1 || !MI.getOperand(0).isMetadata()) { |
658 | LLVM_DEBUG(dbgs() << "Can't handle " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Can't handle " << MI; } } while (false); |
659 | return false; |
660 | } |
661 | |
662 | // Get or create the UserLabel for label here. |
663 | const DILabel *Label = MI.getDebugLabel(); |
664 | const DebugLoc &DL = MI.getDebugLoc(); |
665 | bool Found = false; |
666 | for (auto const &L : userLabels) { |
667 | if (L->match(Label, DL->getInlinedAt(), Idx)) { |
668 | Found = true; |
669 | break; |
670 | } |
671 | } |
672 | if (!Found) |
673 | userLabels.push_back(llvm::make_unique<UserLabel>(Label, DL, Idx)); |
674 | |
675 | return true; |
676 | } |
677 | |
678 | bool LDVImpl::collectDebugValues(MachineFunction &mf) { |
679 | bool Changed = false; |
680 | for (MachineFunction::iterator MFI = mf.begin(), MFE = mf.end(); MFI != MFE; |
681 | ++MFI) { |
682 | MachineBasicBlock *MBB = &*MFI; |
683 | for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end(); |
684 | MBBI != MBBE;) { |
685 | // Use the first debug instruction in the sequence to get a SlotIndex |
686 | // for following consecutive debug instructions. |
687 | if (!MBBI->isDebugInstr()) { |
688 | ++MBBI; |
689 | continue; |
690 | } |
691 | // Debug instructions has no slot index. Use the previous |
692 | // non-debug instruction's SlotIndex as its SlotIndex. |
693 | SlotIndex Idx = |
694 | MBBI == MBB->begin() |
695 | ? LIS->getMBBStartIdx(MBB) |
696 | : LIS->getInstructionIndex(*std::prev(MBBI)).getRegSlot(); |
697 | // Handle consecutive debug instructions with the same slot index. |
698 | do { |
699 | // Only handle DBG_VALUE in handleDebugValue(). Skip all other |
700 | // kinds of debug instructions. |
701 | if ((MBBI->isDebugValue() && handleDebugValue(*MBBI, Idx)) || |
702 | (MBBI->isDebugLabel() && handleDebugLabel(*MBBI, Idx))) { |
703 | MBBI = MBB->erase(MBBI); |
704 | Changed = true; |
705 | } else |
706 | ++MBBI; |
707 | } while (MBBI != MBBE && MBBI->isDebugInstr()); |
708 | } |
709 | } |
710 | return Changed; |
711 | } |
712 | |
713 | void UserValue::extendDef(SlotIndex Idx, DbgValueLocation Loc, LiveRange *LR, |
714 | const VNInfo *VNI, SmallVectorImpl<SlotIndex> *Kills, |
715 | LiveIntervals &LIS) { |
716 | SlotIndex Start = Idx; |
717 | MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start); |
718 | SlotIndex Stop = LIS.getMBBEndIdx(MBB); |
719 | LocMap::iterator I = locInts.find(Start); |
720 | |
721 | // Limit to VNI's live range. |
722 | bool ToEnd = true; |
723 | if (LR && VNI) { |
724 | LiveInterval::Segment *Segment = LR->getSegmentContaining(Start); |
725 | if (!Segment || Segment->valno != VNI) { |
726 | if (Kills) |
727 | Kills->push_back(Start); |
728 | return; |
729 | } |
730 | if (Segment->end < Stop) { |
731 | Stop = Segment->end; |
732 | ToEnd = false; |
733 | } |
734 | } |
735 | |
736 | // There could already be a short def at Start. |
737 | if (I.valid() && I.start() <= Start) { |
738 | // Stop when meeting a different location or an already extended interval. |
739 | Start = Start.getNextSlot(); |
740 | if (I.value() != Loc || I.stop() != Start) |
741 | return; |
742 | // This is a one-slot placeholder. Just skip it. |
743 | ++I; |
744 | } |
745 | |
746 | // Limited by the next def. |
747 | if (I.valid() && I.start() < Stop) { |
748 | Stop = I.start(); |
749 | ToEnd = false; |
Value stored to 'ToEnd' is never read | |
750 | } |
751 | // Limited by VNI's live range. |
752 | else if (!ToEnd && Kills) |
753 | Kills->push_back(Stop); |
754 | |
755 | if (Start < Stop) |
756 | I.insert(Start, Stop, Loc); |
757 | } |
758 | |
759 | void UserValue::addDefsFromCopies( |
760 | LiveInterval *LI, unsigned LocNo, bool WasIndirect, |
761 | const SmallVectorImpl<SlotIndex> &Kills, |
762 | SmallVectorImpl<std::pair<SlotIndex, DbgValueLocation>> &NewDefs, |
763 | MachineRegisterInfo &MRI, LiveIntervals &LIS) { |
764 | if (Kills.empty()) |
765 | return; |
766 | // Don't track copies from physregs, there are too many uses. |
767 | if (!TargetRegisterInfo::isVirtualRegister(LI->reg)) |
768 | return; |
769 | |
770 | // Collect all the (vreg, valno) pairs that are copies of LI. |
771 | SmallVector<std::pair<LiveInterval*, const VNInfo*>, 8> CopyValues; |
772 | for (MachineOperand &MO : MRI.use_nodbg_operands(LI->reg)) { |
773 | MachineInstr *MI = MO.getParent(); |
774 | // Copies of the full value. |
775 | if (MO.getSubReg() || !MI->isCopy()) |
776 | continue; |
777 | unsigned DstReg = MI->getOperand(0).getReg(); |
778 | |
779 | // Don't follow copies to physregs. These are usually setting up call |
780 | // arguments, and the argument registers are always call clobbered. We are |
781 | // better off in the source register which could be a callee-saved register, |
782 | // or it could be spilled. |
783 | if (!TargetRegisterInfo::isVirtualRegister(DstReg)) |
784 | continue; |
785 | |
786 | // Is LocNo extended to reach this copy? If not, another def may be blocking |
787 | // it, or we are looking at a wrong value of LI. |
788 | SlotIndex Idx = LIS.getInstructionIndex(*MI); |
789 | LocMap::iterator I = locInts.find(Idx.getRegSlot(true)); |
790 | if (!I.valid() || I.value().locNo() != LocNo) |
791 | continue; |
792 | |
793 | if (!LIS.hasInterval(DstReg)) |
794 | continue; |
795 | LiveInterval *DstLI = &LIS.getInterval(DstReg); |
796 | const VNInfo *DstVNI = DstLI->getVNInfoAt(Idx.getRegSlot()); |
797 | assert(DstVNI && DstVNI->def == Idx.getRegSlot() && "Bad copy value")((DstVNI && DstVNI->def == Idx.getRegSlot() && "Bad copy value") ? static_cast<void> (0) : __assert_fail ("DstVNI && DstVNI->def == Idx.getRegSlot() && \"Bad copy value\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 797, __PRETTY_FUNCTION__)); |
798 | CopyValues.push_back(std::make_pair(DstLI, DstVNI)); |
799 | } |
800 | |
801 | if (CopyValues.empty()) |
802 | return; |
803 | |
804 | LLVM_DEBUG(dbgs() << "Got " << CopyValues.size() << " copies of " << *LIdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Got " << CopyValues .size() << " copies of " << *LI << '\n'; } } while (false) |
805 | << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Got " << CopyValues .size() << " copies of " << *LI << '\n'; } } while (false); |
806 | |
807 | // Try to add defs of the copied values for each kill point. |
808 | for (unsigned i = 0, e = Kills.size(); i != e; ++i) { |
809 | SlotIndex Idx = Kills[i]; |
810 | for (unsigned j = 0, e = CopyValues.size(); j != e; ++j) { |
811 | LiveInterval *DstLI = CopyValues[j].first; |
812 | const VNInfo *DstVNI = CopyValues[j].second; |
813 | if (DstLI->getVNInfoAt(Idx) != DstVNI) |
814 | continue; |
815 | // Check that there isn't already a def at Idx |
816 | LocMap::iterator I = locInts.find(Idx); |
817 | if (I.valid() && I.start() <= Idx) |
818 | continue; |
819 | LLVM_DEBUG(dbgs() << "Kill at " << Idx << " covered by valno #"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Kill at " << Idx << " covered by valno #" << DstVNI->id << " in " << *DstLI << '\n'; } } while (false) |
820 | << DstVNI->id << " in " << *DstLI << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Kill at " << Idx << " covered by valno #" << DstVNI->id << " in " << *DstLI << '\n'; } } while (false); |
821 | MachineInstr *CopyMI = LIS.getInstructionFromIndex(DstVNI->def); |
822 | assert(CopyMI && CopyMI->isCopy() && "Bad copy value")((CopyMI && CopyMI->isCopy() && "Bad copy value" ) ? static_cast<void> (0) : __assert_fail ("CopyMI && CopyMI->isCopy() && \"Bad copy value\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 822, __PRETTY_FUNCTION__)); |
823 | unsigned LocNo = getLocationNo(CopyMI->getOperand(0)); |
824 | DbgValueLocation NewLoc(LocNo, WasIndirect); |
825 | I.insert(Idx, Idx.getNextSlot(), NewLoc); |
826 | NewDefs.push_back(std::make_pair(Idx, NewLoc)); |
827 | break; |
828 | } |
829 | } |
830 | } |
831 | |
832 | void UserValue::computeIntervals(MachineRegisterInfo &MRI, |
833 | const TargetRegisterInfo &TRI, |
834 | LiveIntervals &LIS, LexicalScopes &LS) { |
835 | SmallVector<std::pair<SlotIndex, DbgValueLocation>, 16> Defs; |
836 | |
837 | // Collect all defs to be extended (Skipping undefs). |
838 | for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) |
839 | if (!I.value().isUndef()) |
840 | Defs.push_back(std::make_pair(I.start(), I.value())); |
841 | |
842 | // Extend all defs, and possibly add new ones along the way. |
843 | for (unsigned i = 0; i != Defs.size(); ++i) { |
844 | SlotIndex Idx = Defs[i].first; |
845 | DbgValueLocation Loc = Defs[i].second; |
846 | const MachineOperand &LocMO = locations[Loc.locNo()]; |
847 | |
848 | if (!LocMO.isReg()) { |
849 | extendDef(Idx, Loc, nullptr, nullptr, nullptr, LIS); |
850 | continue; |
851 | } |
852 | |
853 | // Register locations are constrained to where the register value is live. |
854 | if (TargetRegisterInfo::isVirtualRegister(LocMO.getReg())) { |
855 | LiveInterval *LI = nullptr; |
856 | const VNInfo *VNI = nullptr; |
857 | if (LIS.hasInterval(LocMO.getReg())) { |
858 | LI = &LIS.getInterval(LocMO.getReg()); |
859 | VNI = LI->getVNInfoAt(Idx); |
860 | } |
861 | SmallVector<SlotIndex, 16> Kills; |
862 | extendDef(Idx, Loc, LI, VNI, &Kills, LIS); |
863 | // FIXME: Handle sub-registers in addDefsFromCopies. The problem is that |
864 | // if the original location for example is %vreg0:sub_hi, and we find a |
865 | // full register copy in addDefsFromCopies (at the moment it only handles |
866 | // full register copies), then we must add the sub1 sub-register index to |
867 | // the new location. However, that is only possible if the new virtual |
868 | // register is of the same regclass (or if there is an equivalent |
869 | // sub-register in that regclass). For now, simply skip handling copies if |
870 | // a sub-register is involved. |
871 | if (LI && !LocMO.getSubReg()) |
872 | addDefsFromCopies(LI, Loc.locNo(), Loc.wasIndirect(), Kills, Defs, MRI, |
873 | LIS); |
874 | continue; |
875 | } |
876 | |
877 | // For physregs, we only mark the start slot idx. DwarfDebug will see it |
878 | // as if the DBG_VALUE is valid up until the end of the basic block, or |
879 | // the next def of the physical register. So we do not need to extend the |
880 | // range. It might actually happen that the DBG_VALUE is the last use of |
881 | // the physical register (e.g. if this is an unused input argument to a |
882 | // function). |
883 | } |
884 | |
885 | // The computed intervals may extend beyond the range of the debug |
886 | // location's lexical scope. In this case, splitting of an interval |
887 | // can result in an interval outside of the scope being created, |
888 | // causing extra unnecessary DBG_VALUEs to be emitted. To prevent |
889 | // this, trim the intervals to the lexical scope. |
890 | |
891 | LexicalScope *Scope = LS.findLexicalScope(dl); |
892 | if (!Scope) |
893 | return; |
894 | |
895 | SlotIndex PrevEnd; |
896 | LocMap::iterator I = locInts.begin(); |
897 | |
898 | // Iterate over the lexical scope ranges. Each time round the loop |
899 | // we check the intervals for overlap with the end of the previous |
900 | // range and the start of the next. The first range is handled as |
901 | // a special case where there is no PrevEnd. |
902 | for (const InsnRange &Range : Scope->getRanges()) { |
903 | SlotIndex RStart = LIS.getInstructionIndex(*Range.first); |
904 | SlotIndex REnd = LIS.getInstructionIndex(*Range.second); |
905 | |
906 | // At the start of each iteration I has been advanced so that |
907 | // I.stop() >= PrevEnd. Check for overlap. |
908 | if (PrevEnd && I.start() < PrevEnd) { |
909 | SlotIndex IStop = I.stop(); |
910 | DbgValueLocation Loc = I.value(); |
911 | |
912 | // Stop overlaps previous end - trim the end of the interval to |
913 | // the scope range. |
914 | I.setStopUnchecked(PrevEnd); |
915 | ++I; |
916 | |
917 | // If the interval also overlaps the start of the "next" (i.e. |
918 | // current) range create a new interval for the remainder (which |
919 | // may be further trimmed). |
920 | if (RStart < IStop) |
921 | I.insert(RStart, IStop, Loc); |
922 | } |
923 | |
924 | // Advance I so that I.stop() >= RStart, and check for overlap. |
925 | I.advanceTo(RStart); |
926 | if (!I.valid()) |
927 | return; |
928 | |
929 | if (I.start() < RStart) { |
930 | // Interval start overlaps range - trim to the scope range. |
931 | I.setStartUnchecked(RStart); |
932 | // Remember that this interval was trimmed. |
933 | trimmedDefs.insert(RStart); |
934 | } |
935 | |
936 | // The end of a lexical scope range is the last instruction in the |
937 | // range. To convert to an interval we need the index of the |
938 | // instruction after it. |
939 | REnd = REnd.getNextIndex(); |
940 | |
941 | // Advance I to first interval outside current range. |
942 | I.advanceTo(REnd); |
943 | if (!I.valid()) |
944 | return; |
945 | |
946 | PrevEnd = REnd; |
947 | } |
948 | |
949 | // Check for overlap with end of final range. |
950 | if (PrevEnd && I.start() < PrevEnd) |
951 | I.setStopUnchecked(PrevEnd); |
952 | } |
953 | |
954 | void LDVImpl::computeIntervals() { |
955 | LexicalScopes LS; |
956 | LS.initialize(*MF); |
957 | |
958 | for (unsigned i = 0, e = userValues.size(); i != e; ++i) { |
959 | userValues[i]->computeIntervals(MF->getRegInfo(), *TRI, *LIS, LS); |
960 | userValues[i]->mapVirtRegs(this); |
961 | } |
962 | } |
963 | |
964 | bool LDVImpl::runOnMachineFunction(MachineFunction &mf) { |
965 | clear(); |
966 | MF = &mf; |
967 | LIS = &pass.getAnalysis<LiveIntervals>(); |
968 | TRI = mf.getSubtarget().getRegisterInfo(); |
969 | LLVM_DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: " << mf.getName() << " **********\n"; } } while (false ) |
970 | << mf.getName() << " **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: " << mf.getName() << " **********\n"; } } while (false ); |
971 | |
972 | bool Changed = collectDebugValues(mf); |
973 | computeIntervals(); |
974 | LLVM_DEBUG(print(dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { print(dbgs()); } } while (false); |
975 | ModifiedMF = Changed; |
976 | return Changed; |
977 | } |
978 | |
979 | static void removeDebugValues(MachineFunction &mf) { |
980 | for (MachineBasicBlock &MBB : mf) { |
981 | for (auto MBBI = MBB.begin(), MBBE = MBB.end(); MBBI != MBBE; ) { |
982 | if (!MBBI->isDebugValue()) { |
983 | ++MBBI; |
984 | continue; |
985 | } |
986 | MBBI = MBB.erase(MBBI); |
987 | } |
988 | } |
989 | } |
990 | |
991 | bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) { |
992 | if (!EnableLDV) |
993 | return false; |
994 | if (!mf.getFunction().getSubprogram()) { |
995 | removeDebugValues(mf); |
996 | return false; |
997 | } |
998 | if (!pImpl) |
999 | pImpl = new LDVImpl(this); |
1000 | return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf); |
1001 | } |
1002 | |
1003 | void LiveDebugVariables::releaseMemory() { |
1004 | if (pImpl) |
1005 | static_cast<LDVImpl*>(pImpl)->clear(); |
1006 | } |
1007 | |
1008 | LiveDebugVariables::~LiveDebugVariables() { |
1009 | if (pImpl) |
1010 | delete static_cast<LDVImpl*>(pImpl); |
1011 | } |
1012 | |
1013 | //===----------------------------------------------------------------------===// |
1014 | // Live Range Splitting |
1015 | //===----------------------------------------------------------------------===// |
1016 | |
1017 | bool |
1018 | UserValue::splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs, |
1019 | LiveIntervals& LIS) { |
1020 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Splitting Loc" << OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while (false) |
1021 | dbgs() << "Splitting Loc" << OldLocNo << '\t';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Splitting Loc" << OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while (false) |
1022 | print(dbgs(), nullptr);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Splitting Loc" << OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while (false) |
1023 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Splitting Loc" << OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while (false); |
1024 | bool DidChange = false; |
1025 | LocMap::iterator LocMapI; |
1026 | LocMapI.setMap(locInts); |
1027 | for (unsigned i = 0; i != NewRegs.size(); ++i) { |
1028 | LiveInterval *LI = &LIS.getInterval(NewRegs[i]); |
1029 | if (LI->empty()) |
1030 | continue; |
1031 | |
1032 | // Don't allocate the new LocNo until it is needed. |
1033 | unsigned NewLocNo = UndefLocNo; |
1034 | |
1035 | // Iterate over the overlaps between locInts and LI. |
1036 | LocMapI.find(LI->beginIndex()); |
1037 | if (!LocMapI.valid()) |
1038 | continue; |
1039 | LiveInterval::iterator LII = LI->advanceTo(LI->begin(), LocMapI.start()); |
1040 | LiveInterval::iterator LIE = LI->end(); |
1041 | while (LocMapI.valid() && LII != LIE) { |
1042 | // At this point, we know that LocMapI.stop() > LII->start. |
1043 | LII = LI->advanceTo(LII, LocMapI.start()); |
1044 | if (LII == LIE) |
1045 | break; |
1046 | |
1047 | // Now LII->end > LocMapI.start(). Do we have an overlap? |
1048 | if (LocMapI.value().locNo() == OldLocNo && LII->start < LocMapI.stop()) { |
1049 | // Overlapping correct location. Allocate NewLocNo now. |
1050 | if (NewLocNo == UndefLocNo) { |
1051 | MachineOperand MO = MachineOperand::CreateReg(LI->reg, false); |
1052 | MO.setSubReg(locations[OldLocNo].getSubReg()); |
1053 | NewLocNo = getLocationNo(MO); |
1054 | DidChange = true; |
1055 | } |
1056 | |
1057 | SlotIndex LStart = LocMapI.start(); |
1058 | SlotIndex LStop = LocMapI.stop(); |
1059 | DbgValueLocation OldLoc = LocMapI.value(); |
1060 | |
1061 | // Trim LocMapI down to the LII overlap. |
1062 | if (LStart < LII->start) |
1063 | LocMapI.setStartUnchecked(LII->start); |
1064 | if (LStop > LII->end) |
1065 | LocMapI.setStopUnchecked(LII->end); |
1066 | |
1067 | // Change the value in the overlap. This may trigger coalescing. |
1068 | LocMapI.setValue(OldLoc.changeLocNo(NewLocNo)); |
1069 | |
1070 | // Re-insert any removed OldLocNo ranges. |
1071 | if (LStart < LocMapI.start()) { |
1072 | LocMapI.insert(LStart, LocMapI.start(), OldLoc); |
1073 | ++LocMapI; |
1074 | assert(LocMapI.valid() && "Unexpected coalescing")((LocMapI.valid() && "Unexpected coalescing") ? static_cast <void> (0) : __assert_fail ("LocMapI.valid() && \"Unexpected coalescing\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 1074, __PRETTY_FUNCTION__)); |
1075 | } |
1076 | if (LStop > LocMapI.stop()) { |
1077 | ++LocMapI; |
1078 | LocMapI.insert(LII->end, LStop, OldLoc); |
1079 | --LocMapI; |
1080 | } |
1081 | } |
1082 | |
1083 | // Advance to the next overlap. |
1084 | if (LII->end < LocMapI.stop()) { |
1085 | if (++LII == LIE) |
1086 | break; |
1087 | LocMapI.advanceTo(LII->start); |
1088 | } else { |
1089 | ++LocMapI; |
1090 | if (!LocMapI.valid()) |
1091 | break; |
1092 | LII = LI->advanceTo(LII, LocMapI.start()); |
1093 | } |
1094 | } |
1095 | } |
1096 | |
1097 | // Finally, remove any remaining OldLocNo intervals and OldLocNo itself. |
1098 | locations.erase(locations.begin() + OldLocNo); |
1099 | LocMapI.goToBegin(); |
1100 | while (LocMapI.valid()) { |
1101 | DbgValueLocation v = LocMapI.value(); |
1102 | if (v.locNo() == OldLocNo) { |
1103 | LLVM_DEBUG(dbgs() << "Erasing [" << LocMapI.start() << ';'do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Erasing [" << LocMapI .start() << ';' << LocMapI.stop() << ")\n"; } } while (false) |
1104 | << LocMapI.stop() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "Erasing [" << LocMapI .start() << ';' << LocMapI.stop() << ")\n"; } } while (false); |
1105 | LocMapI.erase(); |
1106 | } else { |
1107 | // Undef values always have location number UndefLocNo, so don't change |
1108 | // locNo in that case. See getLocationNo(). |
1109 | if (!v.isUndef() && v.locNo() > OldLocNo) |
1110 | LocMapI.setValueUnchecked(v.changeLocNo(v.locNo() - 1)); |
1111 | ++LocMapI; |
1112 | } |
1113 | } |
1114 | |
1115 | LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Split result: \t"; print (dbgs(), nullptr); }; } } while (false) |
1116 | dbgs() << "Split result: \t";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Split result: \t"; print (dbgs(), nullptr); }; } } while (false) |
1117 | print(dbgs(), nullptr);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Split result: \t"; print (dbgs(), nullptr); }; } } while (false) |
1118 | })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { { dbgs() << "Split result: \t"; print (dbgs(), nullptr); }; } } while (false); |
1119 | return DidChange; |
1120 | } |
1121 | |
1122 | bool |
1123 | UserValue::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, |
1124 | LiveIntervals &LIS) { |
1125 | bool DidChange = false; |
1126 | // Split locations referring to OldReg. Iterate backwards so splitLocation can |
1127 | // safely erase unused locations. |
1128 | for (unsigned i = locations.size(); i ; --i) { |
1129 | unsigned LocNo = i-1; |
1130 | const MachineOperand *Loc = &locations[LocNo]; |
1131 | if (!Loc->isReg() || Loc->getReg() != OldReg) |
1132 | continue; |
1133 | DidChange |= splitLocation(LocNo, NewRegs, LIS); |
1134 | } |
1135 | return DidChange; |
1136 | } |
1137 | |
1138 | void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs) { |
1139 | bool DidChange = false; |
1140 | for (UserValue *UV = lookupVirtReg(OldReg); UV; UV = UV->getNext()) |
1141 | DidChange |= UV->splitRegister(OldReg, NewRegs, *LIS); |
1142 | |
1143 | if (!DidChange) |
1144 | return; |
1145 | |
1146 | // Map all of the new virtual registers. |
1147 | UserValue *UV = lookupVirtReg(OldReg); |
1148 | for (unsigned i = 0; i != NewRegs.size(); ++i) |
1149 | mapVirtReg(NewRegs[i], UV); |
1150 | } |
1151 | |
1152 | void LiveDebugVariables:: |
1153 | splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, LiveIntervals &LIS) { |
1154 | if (pImpl) |
1155 | static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs); |
1156 | } |
1157 | |
1158 | void UserValue::rewriteLocations(VirtRegMap &VRM, const MachineFunction &MF, |
1159 | const TargetInstrInfo &TII, |
1160 | const TargetRegisterInfo &TRI, |
1161 | SpillOffsetMap &SpillOffsets) { |
1162 | // Build a set of new locations with new numbers so we can coalesce our |
1163 | // IntervalMap if two vreg intervals collapse to the same physical location. |
1164 | // Use MapVector instead of SetVector because MapVector::insert returns the |
1165 | // position of the previously or newly inserted element. The boolean value |
1166 | // tracks if the location was produced by a spill. |
1167 | // FIXME: This will be problematic if we ever support direct and indirect |
1168 | // frame index locations, i.e. expressing both variables in memory and |
1169 | // 'int x, *px = &x'. The "spilled" bit must become part of the location. |
1170 | MapVector<MachineOperand, std::pair<bool, unsigned>> NewLocations; |
1171 | SmallVector<unsigned, 4> LocNoMap(locations.size()); |
1172 | for (unsigned I = 0, E = locations.size(); I != E; ++I) { |
1173 | bool Spilled = false; |
1174 | unsigned SpillOffset = 0; |
1175 | MachineOperand Loc = locations[I]; |
1176 | // Only virtual registers are rewritten. |
1177 | if (Loc.isReg() && Loc.getReg() && |
1178 | TargetRegisterInfo::isVirtualRegister(Loc.getReg())) { |
1179 | unsigned VirtReg = Loc.getReg(); |
1180 | if (VRM.isAssignedReg(VirtReg) && |
1181 | TargetRegisterInfo::isPhysicalRegister(VRM.getPhys(VirtReg))) { |
1182 | // This can create a %noreg operand in rare cases when the sub-register |
1183 | // index is no longer available. That means the user value is in a |
1184 | // non-existent sub-register, and %noreg is exactly what we want. |
1185 | Loc.substPhysReg(VRM.getPhys(VirtReg), TRI); |
1186 | } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) { |
1187 | // Retrieve the stack slot offset. |
1188 | unsigned SpillSize; |
1189 | const MachineRegisterInfo &MRI = MF.getRegInfo(); |
1190 | const TargetRegisterClass *TRC = MRI.getRegClass(VirtReg); |
1191 | bool Success = TII.getStackSlotRange(TRC, Loc.getSubReg(), SpillSize, |
1192 | SpillOffset, MF); |
1193 | |
1194 | // FIXME: Invalidate the location if the offset couldn't be calculated. |
1195 | (void)Success; |
1196 | |
1197 | Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg)); |
1198 | Spilled = true; |
1199 | } else { |
1200 | Loc.setReg(0); |
1201 | Loc.setSubReg(0); |
1202 | } |
1203 | } |
1204 | |
1205 | // Insert this location if it doesn't already exist and record a mapping |
1206 | // from the old number to the new number. |
1207 | auto InsertResult = NewLocations.insert({Loc, {Spilled, SpillOffset}}); |
1208 | unsigned NewLocNo = std::distance(NewLocations.begin(), InsertResult.first); |
1209 | LocNoMap[I] = NewLocNo; |
1210 | } |
1211 | |
1212 | // Rewrite the locations and record the stack slot offsets for spills. |
1213 | locations.clear(); |
1214 | SpillOffsets.clear(); |
1215 | for (auto &Pair : NewLocations) { |
1216 | bool Spilled; |
1217 | unsigned SpillOffset; |
1218 | std::tie(Spilled, SpillOffset) = Pair.second; |
1219 | locations.push_back(Pair.first); |
1220 | if (Spilled) { |
1221 | unsigned NewLocNo = std::distance(&*NewLocations.begin(), &Pair); |
1222 | SpillOffsets[NewLocNo] = SpillOffset; |
1223 | } |
1224 | } |
1225 | |
1226 | // Update the interval map, but only coalesce left, since intervals to the |
1227 | // right use the old location numbers. This should merge two contiguous |
1228 | // DBG_VALUE intervals with different vregs that were allocated to the same |
1229 | // physical register. |
1230 | for (LocMap::iterator I = locInts.begin(); I.valid(); ++I) { |
1231 | DbgValueLocation Loc = I.value(); |
1232 | // Undef values don't exist in locations (and thus not in LocNoMap either) |
1233 | // so skip over them. See getLocationNo(). |
1234 | if (Loc.isUndef()) |
1235 | continue; |
1236 | unsigned NewLocNo = LocNoMap[Loc.locNo()]; |
1237 | I.setValueUnchecked(Loc.changeLocNo(NewLocNo)); |
1238 | I.setStart(I.start()); |
1239 | } |
1240 | } |
1241 | |
1242 | /// Find an iterator for inserting a DBG_VALUE instruction. |
1243 | static MachineBasicBlock::iterator |
1244 | findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx, |
1245 | LiveIntervals &LIS) { |
1246 | SlotIndex Start = LIS.getMBBStartIdx(MBB); |
1247 | Idx = Idx.getBaseIndex(); |
1248 | |
1249 | // Try to find an insert location by going backwards from Idx. |
1250 | MachineInstr *MI; |
1251 | while (!(MI = LIS.getInstructionFromIndex(Idx))) { |
1252 | // We've reached the beginning of MBB. |
1253 | if (Idx == Start) { |
1254 | MachineBasicBlock::iterator I = MBB->SkipPHIsLabelsAndDebug(MBB->begin()); |
1255 | return I; |
1256 | } |
1257 | Idx = Idx.getPrevIndex(); |
1258 | } |
1259 | |
1260 | // Don't insert anything after the first terminator, though. |
1261 | return MI->isTerminator() ? MBB->getFirstTerminator() : |
1262 | std::next(MachineBasicBlock::iterator(MI)); |
1263 | } |
1264 | |
1265 | /// Find an iterator for inserting the next DBG_VALUE instruction |
1266 | /// (or end if no more insert locations found). |
1267 | static MachineBasicBlock::iterator |
1268 | findNextInsertLocation(MachineBasicBlock *MBB, |
1269 | MachineBasicBlock::iterator I, |
1270 | SlotIndex StopIdx, MachineOperand &LocMO, |
1271 | LiveIntervals &LIS, |
1272 | const TargetRegisterInfo &TRI) { |
1273 | if (!LocMO.isReg()) |
1274 | return MBB->instr_end(); |
1275 | unsigned Reg = LocMO.getReg(); |
1276 | |
1277 | // Find the next instruction in the MBB that define the register Reg. |
1278 | while (I != MBB->end() && !I->isTerminator()) { |
1279 | if (!LIS.isNotInMIMap(*I) && |
1280 | SlotIndex::isEarlierEqualInstr(StopIdx, LIS.getInstructionIndex(*I))) |
1281 | break; |
1282 | if (I->definesRegister(Reg, &TRI)) |
1283 | // The insert location is directly after the instruction/bundle. |
1284 | return std::next(I); |
1285 | ++I; |
1286 | } |
1287 | return MBB->end(); |
1288 | } |
1289 | |
1290 | void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex StartIdx, |
1291 | SlotIndex StopIdx, DbgValueLocation Loc, |
1292 | bool Spilled, unsigned SpillOffset, |
1293 | LiveIntervals &LIS, const TargetInstrInfo &TII, |
1294 | const TargetRegisterInfo &TRI) { |
1295 | SlotIndex MBBEndIdx = LIS.getMBBEndIdx(&*MBB); |
1296 | // Only search within the current MBB. |
1297 | StopIdx = (MBBEndIdx < StopIdx) ? MBBEndIdx : StopIdx; |
1298 | MachineBasicBlock::iterator I = findInsertLocation(MBB, StartIdx, LIS); |
1299 | // Undef values don't exist in locations so create new "noreg" register MOs |
1300 | // for them. See getLocationNo(). |
1301 | MachineOperand MO = !Loc.isUndef() ? |
1302 | locations[Loc.locNo()] : |
1303 | MachineOperand::CreateReg(/* Reg */ 0, /* isDef */ false, /* isImp */ false, |
1304 | /* isKill */ false, /* isDead */ false, |
1305 | /* isUndef */ false, /* isEarlyClobber */ false, |
1306 | /* SubReg */ 0, /* isDebug */ true); |
1307 | |
1308 | ++NumInsertedDebugValues; |
1309 | |
1310 | assert(cast<DILocalVariable>(Variable)((cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic (getDebugLoc()) && "Expected inlined-at fields to agree" ) ? static_cast<void> (0) : __assert_fail ("cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic(getDebugLoc()) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 1312, __PRETTY_FUNCTION__)) |
1311 | ->isValidLocationForIntrinsic(getDebugLoc()) &&((cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic (getDebugLoc()) && "Expected inlined-at fields to agree" ) ? static_cast<void> (0) : __assert_fail ("cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic(getDebugLoc()) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 1312, __PRETTY_FUNCTION__)) |
1312 | "Expected inlined-at fields to agree")((cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic (getDebugLoc()) && "Expected inlined-at fields to agree" ) ? static_cast<void> (0) : __assert_fail ("cast<DILocalVariable>(Variable) ->isValidLocationForIntrinsic(getDebugLoc()) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 1312, __PRETTY_FUNCTION__)); |
1313 | |
1314 | // If the location was spilled, the new DBG_VALUE will be indirect. If the |
1315 | // original DBG_VALUE was indirect, we need to add DW_OP_deref to indicate |
1316 | // that the original virtual register was a pointer. Also, add the stack slot |
1317 | // offset for the spilled register to the expression. |
1318 | const DIExpression *Expr = Expression; |
1319 | uint8_t DIExprFlags = DIExpression::ApplyOffset; |
1320 | bool IsIndirect = Loc.wasIndirect(); |
1321 | if (Spilled) { |
1322 | if (IsIndirect) |
1323 | DIExprFlags |= DIExpression::DerefAfter; |
1324 | Expr = |
1325 | DIExpression::prepend(Expr, DIExprFlags, SpillOffset); |
1326 | IsIndirect = true; |
1327 | } |
1328 | |
1329 | assert((!Spilled || MO.isFI()) && "a spilled location must be a frame index")(((!Spilled || MO.isFI()) && "a spilled location must be a frame index" ) ? static_cast<void> (0) : __assert_fail ("(!Spilled || MO.isFI()) && \"a spilled location must be a frame index\"" , "/build/llvm-toolchain-snapshot-9~svn362543/lib/CodeGen/LiveDebugVariables.cpp" , 1329, __PRETTY_FUNCTION__)); |
1330 | |
1331 | do { |
1332 | BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE), |
1333 | IsIndirect, MO, Variable, Expr); |
1334 | |
1335 | // Continue and insert DBG_VALUES after every redefinition of register |
1336 | // associated with the debug value within the range |
1337 | I = findNextInsertLocation(MBB, I, StopIdx, MO, LIS, TRI); |
1338 | } while (I != MBB->end()); |
1339 | } |
1340 | |
1341 | void UserLabel::insertDebugLabel(MachineBasicBlock *MBB, SlotIndex Idx, |
1342 | LiveIntervals &LIS, |
1343 | const TargetInstrInfo &TII) { |
1344 | MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS); |
1345 | ++NumInsertedDebugLabels; |
1346 | BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_LABEL)) |
1347 | .addMetadata(Label); |
1348 | } |
1349 | |
1350 | void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS, |
1351 | const TargetInstrInfo &TII, |
1352 | const TargetRegisterInfo &TRI, |
1353 | const SpillOffsetMap &SpillOffsets) { |
1354 | MachineFunction::iterator MFEnd = VRM->getMachineFunction().end(); |
1355 | |
1356 | for (LocMap::const_iterator I = locInts.begin(); I.valid();) { |
1357 | SlotIndex Start = I.start(); |
1358 | SlotIndex Stop = I.stop(); |
1359 | DbgValueLocation Loc = I.value(); |
1360 | auto SpillIt = |
1361 | !Loc.isUndef() ? SpillOffsets.find(Loc.locNo()) : SpillOffsets.end(); |
1362 | bool Spilled = SpillIt != SpillOffsets.end(); |
1363 | unsigned SpillOffset = Spilled ? SpillIt->second : 0; |
1364 | |
1365 | // If the interval start was trimmed to the lexical scope insert the |
1366 | // DBG_VALUE at the previous index (otherwise it appears after the |
1367 | // first instruction in the range). |
1368 | if (trimmedDefs.count(Start)) |
1369 | Start = Start.getPrevIndex(); |
1370 | |
1371 | LLVM_DEBUG(dbgs() << "\t[" << Start << ';' << Stop << "):" << Loc.locNo())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "\t[" << Start << ';' << Stop << "):" << Loc.locNo(); } } while (false); |
1372 | MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start)->getIterator(); |
1373 | SlotIndex MBBEnd = LIS.getMBBEndIdx(&*MBB); |
1374 | |
1375 | LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB) << '-' << MBBEnd)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << ' ' << printMBBReference (*MBB) << '-' << MBBEnd; } } while (false); |
1376 | insertDebugValue(&*MBB, Start, Stop, Loc, Spilled, SpillOffset, LIS, TII, |
1377 | TRI); |
1378 | // This interval may span multiple basic blocks. |
1379 | // Insert a DBG_VALUE into each one. |
1380 | while (Stop > MBBEnd) { |
1381 | // Move to the next block. |
1382 | Start = MBBEnd; |
1383 | if (++MBB == MFEnd) |
1384 | break; |
1385 | MBBEnd = LIS.getMBBEndIdx(&*MBB); |
1386 | LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB) << '-' << MBBEnd)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << ' ' << printMBBReference (*MBB) << '-' << MBBEnd; } } while (false); |
1387 | insertDebugValue(&*MBB, Start, Stop, Loc, Spilled, SpillOffset, LIS, TII, |
1388 | TRI); |
1389 | } |
1390 | LLVM_DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << '\n'; } } while (false); |
1391 | if (MBB == MFEnd) |
1392 | break; |
1393 | |
1394 | ++I; |
1395 | } |
1396 | } |
1397 | |
1398 | void UserLabel::emitDebugLabel(LiveIntervals &LIS, const TargetInstrInfo &TII) { |
1399 | LLVM_DEBUG(dbgs() << "\t" << loc)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "\t" << loc; } } while (false); |
1400 | MachineFunction::iterator MBB = LIS.getMBBFromIndex(loc)->getIterator(); |
1401 | |
1402 | LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << ' ' << printMBBReference (*MBB); } } while (false); |
1403 | insertDebugLabel(&*MBB, loc, LIS, TII); |
1404 | |
1405 | LLVM_DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << '\n'; } } while (false); |
1406 | } |
1407 | |
1408 | void LDVImpl::emitDebugValues(VirtRegMap *VRM) { |
1409 | LLVM_DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n" ; } } while (false); |
1410 | if (!MF) |
1411 | return; |
1412 | const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo(); |
1413 | SpillOffsetMap SpillOffsets; |
1414 | for (auto &userValue : userValues) { |
1415 | LLVM_DEBUG(userValue->print(dbgs(), TRI))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { userValue->print(dbgs(), TRI); } } while (false); |
1416 | userValue->rewriteLocations(*VRM, *MF, *TII, *TRI, SpillOffsets); |
1417 | userValue->emitDebugValues(VRM, *LIS, *TII, *TRI, SpillOffsets); |
1418 | } |
1419 | LLVM_DEBUG(dbgs() << "********** EMITTING LIVE DEBUG LABELS **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { dbgs() << "********** EMITTING LIVE DEBUG LABELS **********\n" ; } } while (false); |
1420 | for (auto &userLabel : userLabels) { |
1421 | LLVM_DEBUG(userLabel->print(dbgs(), TRI))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("livedebugvars")) { userLabel->print(dbgs(), TRI); } } while (false); |
1422 | userLabel->emitDebugLabel(*LIS, *TII); |
1423 | } |
1424 | EmitDone = true; |
1425 | } |
1426 | |
1427 | void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) { |
1428 | if (pImpl) |
1429 | static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM); |
1430 | } |
1431 | |
1432 | bool LiveDebugVariables::doInitialization(Module &M) { |
1433 | return Pass::doInitialization(M); |
1434 | } |
1435 | |
1436 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
1437 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void LiveDebugVariables::dump() const { |
1438 | if (pImpl) |
1439 | static_cast<LDVImpl*>(pImpl)->print(dbgs()); |
1440 | } |
1441 | #endif |