Bug Summary

File:lib/CodeGen/LiveDebugVariables.cpp
Warning:line 499, column 5
1st function call argument is an uninitialized value

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name LiveDebugVariables.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/include -I /build/llvm-toolchain-snapshot-10~svn374877/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~svn374877/build-llvm/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~svn374877=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-10-15-233810-7101-1 -x c++ /build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp
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
65using namespace llvm;
66
67#define DEBUG_TYPE"livedebugvars" "livedebugvars"
68
69static cl::opt<bool>
70EnableLDV("live-debug-variables", cl::init(true),
71 cl::desc("Enable the live debug variables pass"), cl::Hidden);
72
73STATISTIC(NumInsertedDebugValues, "Number of DBG_VALUEs inserted")static llvm::Statistic NumInsertedDebugValues = {"livedebugvars"
, "NumInsertedDebugValues", "Number of DBG_VALUEs inserted"}
;
74STATISTIC(NumInsertedDebugLabels, "Number of DBG_LABELs inserted")static llvm::Statistic NumInsertedDebugLabels = {"livedebugvars"
, "NumInsertedDebugLabels", "Number of DBG_LABELs inserted"}
;
75
76char LiveDebugVariables::ID = 0;
77
78INITIALIZE_PASS_BEGIN(LiveDebugVariables, DEBUG_TYPE,static void *initializeLiveDebugVariablesPassOnce(PassRegistry
&Registry) {
79 "Debug Variable Analysis", false, false)static void *initializeLiveDebugVariablesPassOnce(PassRegistry
&Registry) {
80INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree)initializeMachineDominatorTreePass(Registry);
81INITIALIZE_PASS_DEPENDENCY(LiveIntervals)initializeLiveIntervalsPass(Registry);
82INITIALIZE_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
85void LiveDebugVariables::getAnalysisUsage(AnalysisUsage &AU) const {
86 AU.addRequired<MachineDominatorTree>();
87 AU.addRequiredTransitive<LiveIntervals>();
88 AU.setPreservesAll();
89 MachineFunctionPass::getAnalysisUsage(AU);
90}
91
92LiveDebugVariables::LiveDebugVariables() : MachineFunctionPass(ID) {
93 initializeLiveDebugVariablesPass(*PassRegistry::getPassRegistry());
94}
95
96enum : unsigned { UndefLocNo = ~0U };
97
98/// Describes a location by number along with some flags about the original
99/// usage of the location.
100class DbgValueLocation {
101public:
102 DbgValueLocation(unsigned LocNo)
103 : LocNo(LocNo) {
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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 105, __PRETTY_FUNCTION__))
;
106 }
107
108 DbgValueLocation() : LocNo(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 isUndef() const { return locNo() == UndefLocNo; }
115
116 DbgValueLocation changeLocNo(unsigned NewLocNo) const {
117 return DbgValueLocation(NewLocNo);
118 }
119
120 friend inline bool operator==(const DbgValueLocation &LHS,
121 const DbgValueLocation &RHS) {
122 return LHS.LocNo == RHS.LocNo;
123 }
124
125 friend inline bool operator!=(const DbgValueLocation &LHS,
126 const DbgValueLocation &RHS) {
127 return !(LHS == RHS);
128 }
129
130private:
131 unsigned LocNo;
132};
133
134/// Map of where a user value is live, and its location.
135using LocMap = IntervalMap<SlotIndex, DbgValueLocation, 4>;
136
137/// Map of stack slot offsets for spilled locations.
138/// Non-spilled locations are not added to the map.
139using SpillOffsetMap = DenseMap<unsigned, unsigned>;
140
141namespace {
142
143class LDVImpl;
144
145/// A user value is a part of a debug info user variable.
146///
147/// A DBG_VALUE instruction notes that (a sub-register of) a virtual register
148/// holds part of a user variable. The part is identified by a byte offset.
149///
150/// UserValues are grouped into equivalence classes for easier searching. Two
151/// user values are related if they refer to the same variable, or if they are
152/// held by the same virtual register. The equivalence class is the transitive
153/// closure of that relation.
154class UserValue {
155 const DILocalVariable *Variable; ///< The debug info variable we are part of.
156 const DIExpression *Expression; ///< Any complex address expression.
157 DebugLoc dl; ///< The debug location for the variable. This is
158 ///< used by dwarf writer to find lexical scope.
159 UserValue *leader; ///< Equivalence class leader.
160 UserValue *next = nullptr; ///< Next value in equivalence class, or null.
161
162 /// Numbered locations referenced by locmap.
163 SmallVector<MachineOperand, 4> locations;
164
165 /// Map of slot indices where this value is live.
166 LocMap locInts;
167
168 /// Insert a DBG_VALUE into MBB at Idx for LocNo.
169 void insertDebugValue(MachineBasicBlock *MBB, SlotIndex StartIdx,
170 SlotIndex StopIdx, DbgValueLocation Loc, bool Spilled,
171 unsigned SpillOffset, LiveIntervals &LIS,
172 const TargetInstrInfo &TII,
173 const TargetRegisterInfo &TRI);
174
175 /// Replace OldLocNo ranges with NewRegs ranges where NewRegs
176 /// is live. Returns true if any changes were made.
177 bool splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
178 LiveIntervals &LIS);
179
180public:
181 /// Create a new UserValue.
182 UserValue(const DILocalVariable *var, const DIExpression *expr, DebugLoc L,
183 LocMap::Allocator &alloc)
184 : Variable(var), Expression(expr), dl(std::move(L)), leader(this),
185 locInts(alloc) {}
186
187 /// Get the leader of this value's equivalence class.
188 UserValue *getLeader() {
189 UserValue *l = leader;
190 while (l != l->leader)
191 l = l->leader;
192 return leader = l;
193 }
194
195 /// Return the next UserValue in the equivalence class.
196 UserValue *getNext() const { return next; }
197
198 /// Does this UserValue match the parameters?
199 bool match(const DILocalVariable *Var, const DIExpression *Expr,
200 const DILocation *IA) const {
201 // FIXME: The fragment should be part of the equivalence class, but not
202 // other things in the expression like stack values.
203 return Var == Variable && Expr == Expression && dl->getInlinedAt() == IA;
204 }
205
206 /// Merge equivalence classes.
207 static UserValue *merge(UserValue *L1, UserValue *L2) {
208 L2 = L2->getLeader();
209 if (!L1)
210 return L2;
211 L1 = L1->getLeader();
212 if (L1 == L2)
213 return L1;
214 // Splice L2 before L1's members.
215 UserValue *End = L2;
216 while (End->next) {
217 End->leader = L1;
218 End = End->next;
219 }
220 End->leader = L1;
221 End->next = L1->next;
222 L1->next = L2;
223 return L1;
224 }
225
226 /// Return the location number that matches Loc.
227 ///
228 /// For undef values we always return location number UndefLocNo without
229 /// inserting anything in locations. Since locations is a vector and the
230 /// location number is the position in the vector and UndefLocNo is ~0,
231 /// we would need a very big vector to put the value at the right position.
232 unsigned getLocationNo(const MachineOperand &LocMO) {
233 if (LocMO.isReg()) {
234 if (LocMO.getReg() == 0)
235 return UndefLocNo;
236 // For register locations we dont care about use/def and other flags.
237 for (unsigned i = 0, e = locations.size(); i != e; ++i)
238 if (locations[i].isReg() &&
239 locations[i].getReg() == LocMO.getReg() &&
240 locations[i].getSubReg() == LocMO.getSubReg())
241 return i;
242 } else
243 for (unsigned i = 0, e = locations.size(); i != e; ++i)
244 if (LocMO.isIdenticalTo(locations[i]))
245 return i;
246 locations.push_back(LocMO);
247 // We are storing a MachineOperand outside a MachineInstr.
248 locations.back().clearParent();
249 // Don't store def operands.
250 if (locations.back().isReg()) {
251 if (locations.back().isDef())
252 locations.back().setIsDead(false);
253 locations.back().setIsUse();
254 }
255 return locations.size() - 1;
256 }
257
258 /// Ensure that all virtual register locations are mapped.
259 void mapVirtRegs(LDVImpl *LDV);
260
261 /// Add a definition point to this value.
262 void addDef(SlotIndex Idx, const MachineOperand &LocMO) {
263 DbgValueLocation Loc(getLocationNo(LocMO));
264 // Add a singular (Idx,Idx) -> Loc mapping.
265 LocMap::iterator I = locInts.find(Idx);
266 if (!I.valid() || I.start() != Idx)
267 I.insert(Idx, Idx.getNextSlot(), Loc);
268 else
269 // A later DBG_VALUE at the same SlotIndex overrides the old location.
270 I.setValue(Loc);
271 }
272
273 /// Extend the current definition as far as possible down.
274 ///
275 /// Stop when meeting an existing def or when leaving the live
276 /// range of VNI. End points where VNI is no longer live are added to Kills.
277 ///
278 /// We only propagate DBG_VALUES locally here. LiveDebugValues performs a
279 /// data-flow analysis to propagate them beyond basic block boundaries.
280 ///
281 /// \param Idx Starting point for the definition.
282 /// \param Loc Location number to propagate.
283 /// \param LR Restrict liveness to where LR has the value VNI. May be null.
284 /// \param VNI When LR is not null, this is the value to restrict to.
285 /// \param [out] Kills Append end points of VNI's live range to Kills.
286 /// \param LIS Live intervals analysis.
287 void extendDef(SlotIndex Idx, DbgValueLocation Loc,
288 LiveRange *LR, const VNInfo *VNI,
289 SmallVectorImpl<SlotIndex> *Kills,
290 LiveIntervals &LIS);
291
292 /// The value in LI/LocNo may be copies to other registers. Determine if
293 /// any of the copies are available at the kill points, and add defs if
294 /// possible.
295 ///
296 /// \param LI Scan for copies of the value in LI->reg.
297 /// \param LocNo Location number of LI->reg.
298 /// \param Kills Points where the range of LocNo could be extended.
299 /// \param [in,out] NewDefs Append (Idx, LocNo) of inserted defs here.
300 void addDefsFromCopies(
301 LiveInterval *LI, unsigned LocNo,
302 const SmallVectorImpl<SlotIndex> &Kills,
303 SmallVectorImpl<std::pair<SlotIndex, DbgValueLocation>> &NewDefs,
304 MachineRegisterInfo &MRI, LiveIntervals &LIS);
305
306 /// Compute the live intervals of all locations after collecting all their
307 /// def points.
308 void computeIntervals(MachineRegisterInfo &MRI, const TargetRegisterInfo &TRI,
309 LiveIntervals &LIS, LexicalScopes &LS);
310
311 /// Replace OldReg ranges with NewRegs ranges where NewRegs is
312 /// live. Returns true if any changes were made.
313 bool splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
314 LiveIntervals &LIS);
315
316 /// Rewrite virtual register locations according to the provided virtual
317 /// register map. Record the stack slot offsets for the locations that
318 /// were spilled.
319 void rewriteLocations(VirtRegMap &VRM, const MachineFunction &MF,
320 const TargetInstrInfo &TII,
321 const TargetRegisterInfo &TRI,
322 SpillOffsetMap &SpillOffsets);
323
324 /// Recreate DBG_VALUE instruction from data structures.
325 void emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
326 const TargetInstrInfo &TII,
327 const TargetRegisterInfo &TRI,
328 const SpillOffsetMap &SpillOffsets);
329
330 /// Return DebugLoc of this UserValue.
331 DebugLoc getDebugLoc() { return dl;}
332
333 void print(raw_ostream &, const TargetRegisterInfo *);
334};
335
336/// A user label is a part of a debug info user label.
337class UserLabel {
338 const DILabel *Label; ///< The debug info label we are part of.
339 DebugLoc dl; ///< The debug location for the label. This is
340 ///< used by dwarf writer to find lexical scope.
341 SlotIndex loc; ///< Slot used by the debug label.
342
343 /// Insert a DBG_LABEL into MBB at Idx.
344 void insertDebugLabel(MachineBasicBlock *MBB, SlotIndex Idx,
345 LiveIntervals &LIS, const TargetInstrInfo &TII);
346
347public:
348 /// Create a new UserLabel.
349 UserLabel(const DILabel *label, DebugLoc L, SlotIndex Idx)
350 : Label(label), dl(std::move(L)), loc(Idx) {}
351
352 /// Does this UserLabel match the parameters?
353 bool match(const DILabel *L, const DILocation *IA,
354 const SlotIndex Index) const {
355 return Label == L && dl->getInlinedAt() == IA && loc == Index;
356 }
357
358 /// Recreate DBG_LABEL instruction from data structures.
359 void emitDebugLabel(LiveIntervals &LIS, const TargetInstrInfo &TII);
360
361 /// Return DebugLoc of this UserLabel.
362 DebugLoc getDebugLoc() { return dl; }
363
364 void print(raw_ostream &, const TargetRegisterInfo *);
365};
366
367/// Implementation of the LiveDebugVariables pass.
368class LDVImpl {
369 LiveDebugVariables &pass;
370 LocMap::Allocator allocator;
371 MachineFunction *MF = nullptr;
372 LiveIntervals *LIS;
373 const TargetRegisterInfo *TRI;
374
375 /// Whether emitDebugValues is called.
376 bool EmitDone = false;
377
378 /// Whether the machine function is modified during the pass.
379 bool ModifiedMF = false;
380
381 /// All allocated UserValue instances.
382 SmallVector<std::unique_ptr<UserValue>, 8> userValues;
383
384 /// All allocated UserLabel instances.
385 SmallVector<std::unique_ptr<UserLabel>, 2> userLabels;
386
387 /// Map virtual register to eq class leader.
388 using VRMap = DenseMap<unsigned, UserValue *>;
389 VRMap virtRegToEqClass;
390
391 /// Map user variable to eq class leader.
392 using UVMap = DenseMap<const DILocalVariable *, UserValue *>;
393 UVMap userVarMap;
394
395 /// Find or create a UserValue.
396 UserValue *getUserValue(const DILocalVariable *Var, const DIExpression *Expr,
397 const DebugLoc &DL);
398
399 /// Find the EC leader for VirtReg or null.
400 UserValue *lookupVirtReg(unsigned VirtReg);
401
402 /// Add DBG_VALUE instruction to our maps.
403 ///
404 /// \param MI DBG_VALUE instruction
405 /// \param Idx Last valid SLotIndex before instruction.
406 ///
407 /// \returns True if the DBG_VALUE instruction should be deleted.
408 bool handleDebugValue(MachineInstr &MI, SlotIndex Idx);
409
410 /// Add DBG_LABEL instruction to UserLabel.
411 ///
412 /// \param MI DBG_LABEL instruction
413 /// \param Idx Last valid SlotIndex before instruction.
414 ///
415 /// \returns True if the DBG_LABEL instruction should be deleted.
416 bool handleDebugLabel(MachineInstr &MI, SlotIndex Idx);
417
418 /// Collect and erase all DBG_VALUE instructions, adding a UserValue def
419 /// for each instruction.
420 ///
421 /// \param mf MachineFunction to be scanned.
422 ///
423 /// \returns True if any debug values were found.
424 bool collectDebugValues(MachineFunction &mf);
425
426 /// Compute the live intervals of all user values after collecting all
427 /// their def points.
428 void computeIntervals();
429
430public:
431 LDVImpl(LiveDebugVariables *ps) : pass(*ps) {}
432
433 bool runOnMachineFunction(MachineFunction &mf);
434
435 /// Release all memory.
436 void clear() {
437 MF = nullptr;
438 userValues.clear();
439 userLabels.clear();
440 virtRegToEqClass.clear();
441 userVarMap.clear();
442 // Make sure we call emitDebugValues if the machine function was modified.
443 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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 444, __PRETTY_FUNCTION__))
444 "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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 444, __PRETTY_FUNCTION__))
;
445 EmitDone = false;
446 ModifiedMF = false;
447 }
448
449 /// Map virtual register to an equivalence class.
450 void mapVirtReg(unsigned VirtReg, UserValue *EC);
451
452 /// Replace all references to OldReg with NewRegs.
453 void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs);
454
455 /// Recreate DBG_VALUE instruction from data structures.
456 void emitDebugValues(VirtRegMap *VRM);
457
458 void print(raw_ostream&);
459};
460
461} // end anonymous namespace
462
463#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
464static void printDebugLoc(const DebugLoc &DL, raw_ostream &CommentOS,
465 const LLVMContext &Ctx) {
466 if (!DL)
467 return;
468
469 auto *Scope = cast<DIScope>(DL.getScope());
470 // Omit the directory, because it's likely to be long and uninteresting.
471 CommentOS << Scope->getFilename();
472 CommentOS << ':' << DL.getLine();
473 if (DL.getCol() != 0)
474 CommentOS << ':' << DL.getCol();
475
476 DebugLoc InlinedAtDL = DL.getInlinedAt();
477 if (!InlinedAtDL)
478 return;
479
480 CommentOS << " @[ ";
481 printDebugLoc(InlinedAtDL, CommentOS, Ctx);
482 CommentOS << " ]";
483}
484
485static void printExtendedName(raw_ostream &OS, const DINode *Node,
486 const DILocation *DL) {
487 const LLVMContext &Ctx = Node->getContext();
488 StringRef Res;
489 unsigned Line;
7
'Line' declared without an initial value
490 if (const auto *V
8.1
'V' is null
= dyn_cast<const DILocalVariable>(Node)) {
8
Assuming 'Node' is not a 'DILocalVariable'
9
Taking false branch
491 Res = V->getName();
492 Line = V->getLine();
493 } else if (const auto *L
10.1
'L' is null
= dyn_cast<const DILabel>(Node)) {
10
Assuming 'Node' is not a 'DILabel'
11
Taking false branch
494 Res = L->getName();
495 Line = L->getLine();
496 }
497
498 if (!Res.empty())
12
Assuming the condition is true
13
Taking true branch
499 OS << Res << "," << Line;
14
1st function call argument is an uninitialized value
500 auto *InlinedAt = DL ? DL->getInlinedAt() : nullptr;
501 if (InlinedAt) {
502 if (DebugLoc InlinedAtDL = InlinedAt) {
503 OS << " @[";
504 printDebugLoc(InlinedAtDL, OS, Ctx);
505 OS << "]";
506 }
507 }
508}
509
510void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
511 OS << "!\"";
512 printExtendedName(OS, Variable, dl);
6
Calling 'printExtendedName'
513
514 OS << "\"\t";
515 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I) {
516 OS << " [" << I.start() << ';' << I.stop() << "):";
517 if (I.value().isUndef())
518 OS << "undef";
519 else {
520 OS << I.value().locNo();
521 }
522 }
523 for (unsigned i = 0, e = locations.size(); i != e; ++i) {
524 OS << " Loc" << i << '=';
525 locations[i].print(OS, TRI);
526 }
527 OS << '\n';
528}
529
530void UserLabel::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
531 OS << "!\"";
532 printExtendedName(OS, Label, dl);
533
534 OS << "\"\t";
535 OS << loc;
536 OS << '\n';
537}
538
539void LDVImpl::print(raw_ostream &OS) {
540 OS << "********** DEBUG VARIABLES **********\n";
541 for (auto &userValue : userValues)
4
Assuming '__begin1' is not equal to '__end1'
542 userValue->print(OS, TRI);
5
Calling 'UserValue::print'
543 OS << "********** DEBUG LABELS **********\n";
544 for (auto &userLabel : userLabels)
545 userLabel->print(OS, TRI);
546}
547#endif
548
549void UserValue::mapVirtRegs(LDVImpl *LDV) {
550 for (unsigned i = 0, e = locations.size(); i != e; ++i)
551 if (locations[i].isReg() &&
552 Register::isVirtualRegister(locations[i].getReg()))
553 LDV->mapVirtReg(locations[i].getReg(), this);
554}
555
556UserValue *LDVImpl::getUserValue(const DILocalVariable *Var,
557 const DIExpression *Expr, const DebugLoc &DL) {
558 UserValue *&Leader = userVarMap[Var];
559 if (Leader) {
560 UserValue *UV = Leader->getLeader();
561 Leader = UV;
562 for (; UV; UV = UV->getNext())
563 if (UV->match(Var, Expr, DL->getInlinedAt()))
564 return UV;
565 }
566
567 userValues.push_back(
568 std::make_unique<UserValue>(Var, Expr, DL, allocator));
569 UserValue *UV = userValues.back().get();
570 Leader = UserValue::merge(Leader, UV);
571 return UV;
572}
573
574void LDVImpl::mapVirtReg(unsigned VirtReg, UserValue *EC) {
575 assert(Register::isVirtualRegister(VirtReg) && "Only map VirtRegs")((Register::isVirtualRegister(VirtReg) && "Only map VirtRegs"
) ? static_cast<void> (0) : __assert_fail ("Register::isVirtualRegister(VirtReg) && \"Only map VirtRegs\""
, "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 575, __PRETTY_FUNCTION__))
;
576 UserValue *&Leader = virtRegToEqClass[VirtReg];
577 Leader = UserValue::merge(Leader, EC);
578}
579
580UserValue *LDVImpl::lookupVirtReg(unsigned VirtReg) {
581 if (UserValue *UV = virtRegToEqClass.lookup(VirtReg))
582 return UV->getLeader();
583 return nullptr;
584}
585
586bool LDVImpl::handleDebugValue(MachineInstr &MI, SlotIndex Idx) {
587 // DBG_VALUE loc, offset, variable
588 if (MI.getNumOperands() != 4 ||
589 !(MI.getOperand(1).isReg() || MI.getOperand(1).isImm()) ||
590 !MI.getOperand(2).isMetadata()) {
591 LLVM_DEBUG(dbgs() << "Can't handle " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Can't handle " <<
MI; } } while (false)
;
592 return false;
593 }
594
595 // Detect invalid DBG_VALUE instructions, with a debug-use of a virtual
596 // register that hasn't been defined yet. If we do not remove those here, then
597 // the re-insertion of the DBG_VALUE instruction after register allocation
598 // will be incorrect.
599 // TODO: If earlier passes are corrected to generate sane debug information
600 // (and if the machine verifier is improved to catch this), then these checks
601 // could be removed or replaced by asserts.
602 bool Discard = false;
603 if (MI.getOperand(0).isReg() &&
604 Register::isVirtualRegister(MI.getOperand(0).getReg())) {
605 const Register Reg = MI.getOperand(0).getReg();
606 if (!LIS->hasInterval(Reg)) {
607 // The DBG_VALUE is described by a virtual register that does not have a
608 // live interval. Discard the DBG_VALUE.
609 Discard = true;
610 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)
611 << " " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Discarding debug info (no LIS interval): "
<< Idx << " " << MI; } } while (false)
;
612 } else {
613 // The DBG_VALUE is only valid if either Reg is live out from Idx, or Reg
614 // is defined dead at Idx (where Idx is the slot index for the instruction
615 // preceding the DBG_VALUE).
616 const LiveInterval &LI = LIS->getInterval(Reg);
617 LiveQueryResult LRQ = LI.Query(Idx);
618 if (!LRQ.valueOutOrDead()) {
619 // We have found a DBG_VALUE with the value in a virtual register that
620 // is not live. Discard the DBG_VALUE.
621 Discard = true;
622 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)
623 << " " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Discarding debug info (reg not live): "
<< Idx << " " << MI; } } while (false)
;
624 }
625 }
626 }
627
628 // Get or create the UserValue for (variable,offset) here.
629 assert(!MI.getOperand(1).isImm() && "DBG_VALUE with indirect flag before "((!MI.getOperand(1).isImm() && "DBG_VALUE with indirect flag before "
"LiveDebugVariables") ? static_cast<void> (0) : __assert_fail
("!MI.getOperand(1).isImm() && \"DBG_VALUE with indirect flag before \" \"LiveDebugVariables\""
, "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 630, __PRETTY_FUNCTION__))
630 "LiveDebugVariables")((!MI.getOperand(1).isImm() && "DBG_VALUE with indirect flag before "
"LiveDebugVariables") ? static_cast<void> (0) : __assert_fail
("!MI.getOperand(1).isImm() && \"DBG_VALUE with indirect flag before \" \"LiveDebugVariables\""
, "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 630, __PRETTY_FUNCTION__))
;
631 const DILocalVariable *Var = MI.getDebugVariable();
632 const DIExpression *Expr = MI.getDebugExpression();
633 UserValue *UV =
634 getUserValue(Var, Expr, MI.getDebugLoc());
635 if (!Discard)
636 UV->addDef(Idx, MI.getOperand(0));
637 else {
638 MachineOperand MO = MachineOperand::CreateReg(0U, false);
639 MO.setIsDebug();
640 UV->addDef(Idx, MO);
641 }
642 return true;
643}
644
645bool LDVImpl::handleDebugLabel(MachineInstr &MI, SlotIndex Idx) {
646 // DBG_LABEL label
647 if (MI.getNumOperands() != 1 || !MI.getOperand(0).isMetadata()) {
648 LLVM_DEBUG(dbgs() << "Can't handle " << MI)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Can't handle " <<
MI; } } while (false)
;
649 return false;
650 }
651
652 // Get or create the UserLabel for label here.
653 const DILabel *Label = MI.getDebugLabel();
654 const DebugLoc &DL = MI.getDebugLoc();
655 bool Found = false;
656 for (auto const &L : userLabels) {
657 if (L->match(Label, DL->getInlinedAt(), Idx)) {
658 Found = true;
659 break;
660 }
661 }
662 if (!Found)
663 userLabels.push_back(std::make_unique<UserLabel>(Label, DL, Idx));
664
665 return true;
666}
667
668bool LDVImpl::collectDebugValues(MachineFunction &mf) {
669 bool Changed = false;
670 for (MachineFunction::iterator MFI = mf.begin(), MFE = mf.end(); MFI != MFE;
671 ++MFI) {
672 MachineBasicBlock *MBB = &*MFI;
673 for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end();
674 MBBI != MBBE;) {
675 // Use the first debug instruction in the sequence to get a SlotIndex
676 // for following consecutive debug instructions.
677 if (!MBBI->isDebugInstr()) {
678 ++MBBI;
679 continue;
680 }
681 // Debug instructions has no slot index. Use the previous
682 // non-debug instruction's SlotIndex as its SlotIndex.
683 SlotIndex Idx =
684 MBBI == MBB->begin()
685 ? LIS->getMBBStartIdx(MBB)
686 : LIS->getInstructionIndex(*std::prev(MBBI)).getRegSlot();
687 // Handle consecutive debug instructions with the same slot index.
688 do {
689 // Only handle DBG_VALUE in handleDebugValue(). Skip all other
690 // kinds of debug instructions.
691 if ((MBBI->isDebugValue() && handleDebugValue(*MBBI, Idx)) ||
692 (MBBI->isDebugLabel() && handleDebugLabel(*MBBI, Idx))) {
693 MBBI = MBB->erase(MBBI);
694 Changed = true;
695 } else
696 ++MBBI;
697 } while (MBBI != MBBE && MBBI->isDebugInstr());
698 }
699 }
700 return Changed;
701}
702
703void UserValue::extendDef(SlotIndex Idx, DbgValueLocation Loc, LiveRange *LR,
704 const VNInfo *VNI, SmallVectorImpl<SlotIndex> *Kills,
705 LiveIntervals &LIS) {
706 SlotIndex Start = Idx;
707 MachineBasicBlock *MBB = LIS.getMBBFromIndex(Start);
708 SlotIndex Stop = LIS.getMBBEndIdx(MBB);
709 LocMap::iterator I = locInts.find(Start);
710
711 // Limit to VNI's live range.
712 bool ToEnd = true;
713 if (LR && VNI) {
714 LiveInterval::Segment *Segment = LR->getSegmentContaining(Start);
715 if (!Segment || Segment->valno != VNI) {
716 if (Kills)
717 Kills->push_back(Start);
718 return;
719 }
720 if (Segment->end < Stop) {
721 Stop = Segment->end;
722 ToEnd = false;
723 }
724 }
725
726 // There could already be a short def at Start.
727 if (I.valid() && I.start() <= Start) {
728 // Stop when meeting a different location or an already extended interval.
729 Start = Start.getNextSlot();
730 if (I.value() != Loc || I.stop() != Start)
731 return;
732 // This is a one-slot placeholder. Just skip it.
733 ++I;
734 }
735
736 // Limited by the next def.
737 if (I.valid() && I.start() < Stop)
738 Stop = I.start();
739 // Limited by VNI's live range.
740 else if (!ToEnd && Kills)
741 Kills->push_back(Stop);
742
743 if (Start < Stop)
744 I.insert(Start, Stop, Loc);
745}
746
747void UserValue::addDefsFromCopies(
748 LiveInterval *LI, unsigned LocNo,
749 const SmallVectorImpl<SlotIndex> &Kills,
750 SmallVectorImpl<std::pair<SlotIndex, DbgValueLocation>> &NewDefs,
751 MachineRegisterInfo &MRI, LiveIntervals &LIS) {
752 if (Kills.empty())
753 return;
754 // Don't track copies from physregs, there are too many uses.
755 if (!Register::isVirtualRegister(LI->reg))
756 return;
757
758 // Collect all the (vreg, valno) pairs that are copies of LI.
759 SmallVector<std::pair<LiveInterval*, const VNInfo*>, 8> CopyValues;
760 for (MachineOperand &MO : MRI.use_nodbg_operands(LI->reg)) {
761 MachineInstr *MI = MO.getParent();
762 // Copies of the full value.
763 if (MO.getSubReg() || !MI->isCopy())
764 continue;
765 Register DstReg = MI->getOperand(0).getReg();
766
767 // Don't follow copies to physregs. These are usually setting up call
768 // arguments, and the argument registers are always call clobbered. We are
769 // better off in the source register which could be a callee-saved register,
770 // or it could be spilled.
771 if (!Register::isVirtualRegister(DstReg))
772 continue;
773
774 // Is LocNo extended to reach this copy? If not, another def may be blocking
775 // it, or we are looking at a wrong value of LI.
776 SlotIndex Idx = LIS.getInstructionIndex(*MI);
777 LocMap::iterator I = locInts.find(Idx.getRegSlot(true));
778 if (!I.valid() || I.value().locNo() != LocNo)
779 continue;
780
781 if (!LIS.hasInterval(DstReg))
782 continue;
783 LiveInterval *DstLI = &LIS.getInterval(DstReg);
784 const VNInfo *DstVNI = DstLI->getVNInfoAt(Idx.getRegSlot());
785 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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 785, __PRETTY_FUNCTION__))
;
786 CopyValues.push_back(std::make_pair(DstLI, DstVNI));
787 }
788
789 if (CopyValues.empty())
790 return;
791
792 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)
793 << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Got " << CopyValues
.size() << " copies of " << *LI << '\n'; } }
while (false)
;
794
795 // Try to add defs of the copied values for each kill point.
796 for (unsigned i = 0, e = Kills.size(); i != e; ++i) {
797 SlotIndex Idx = Kills[i];
798 for (unsigned j = 0, e = CopyValues.size(); j != e; ++j) {
799 LiveInterval *DstLI = CopyValues[j].first;
800 const VNInfo *DstVNI = CopyValues[j].second;
801 if (DstLI->getVNInfoAt(Idx) != DstVNI)
802 continue;
803 // Check that there isn't already a def at Idx
804 LocMap::iterator I = locInts.find(Idx);
805 if (I.valid() && I.start() <= Idx)
806 continue;
807 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)
808 << 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)
;
809 MachineInstr *CopyMI = LIS.getInstructionFromIndex(DstVNI->def);
810 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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 810, __PRETTY_FUNCTION__))
;
811 unsigned LocNo = getLocationNo(CopyMI->getOperand(0));
812 DbgValueLocation NewLoc(LocNo);
813 I.insert(Idx, Idx.getNextSlot(), NewLoc);
814 NewDefs.push_back(std::make_pair(Idx, NewLoc));
815 break;
816 }
817 }
818}
819
820void UserValue::computeIntervals(MachineRegisterInfo &MRI,
821 const TargetRegisterInfo &TRI,
822 LiveIntervals &LIS, LexicalScopes &LS) {
823 SmallVector<std::pair<SlotIndex, DbgValueLocation>, 16> Defs;
824
825 // Collect all defs to be extended (Skipping undefs).
826 for (LocMap::const_iterator I = locInts.begin(); I.valid(); ++I)
827 if (!I.value().isUndef())
828 Defs.push_back(std::make_pair(I.start(), I.value()));
829
830 // Extend all defs, and possibly add new ones along the way.
831 for (unsigned i = 0; i != Defs.size(); ++i) {
832 SlotIndex Idx = Defs[i].first;
833 DbgValueLocation Loc = Defs[i].second;
834 const MachineOperand &LocMO = locations[Loc.locNo()];
835
836 if (!LocMO.isReg()) {
837 extendDef(Idx, Loc, nullptr, nullptr, nullptr, LIS);
838 continue;
839 }
840
841 // Register locations are constrained to where the register value is live.
842 if (Register::isVirtualRegister(LocMO.getReg())) {
843 LiveInterval *LI = nullptr;
844 const VNInfo *VNI = nullptr;
845 if (LIS.hasInterval(LocMO.getReg())) {
846 LI = &LIS.getInterval(LocMO.getReg());
847 VNI = LI->getVNInfoAt(Idx);
848 }
849 SmallVector<SlotIndex, 16> Kills;
850 extendDef(Idx, Loc, LI, VNI, &Kills, LIS);
851 // FIXME: Handle sub-registers in addDefsFromCopies. The problem is that
852 // if the original location for example is %vreg0:sub_hi, and we find a
853 // full register copy in addDefsFromCopies (at the moment it only handles
854 // full register copies), then we must add the sub1 sub-register index to
855 // the new location. However, that is only possible if the new virtual
856 // register is of the same regclass (or if there is an equivalent
857 // sub-register in that regclass). For now, simply skip handling copies if
858 // a sub-register is involved.
859 if (LI && !LocMO.getSubReg())
860 addDefsFromCopies(LI, Loc.locNo(), Kills, Defs, MRI, LIS);
861 continue;
862 }
863
864 // For physregs, we only mark the start slot idx. DwarfDebug will see it
865 // as if the DBG_VALUE is valid up until the end of the basic block, or
866 // the next def of the physical register. So we do not need to extend the
867 // range. It might actually happen that the DBG_VALUE is the last use of
868 // the physical register (e.g. if this is an unused input argument to a
869 // function).
870 }
871
872 // The computed intervals may extend beyond the range of the debug
873 // location's lexical scope. In this case, splitting of an interval
874 // can result in an interval outside of the scope being created,
875 // causing extra unnecessary DBG_VALUEs to be emitted. To prevent
876 // this, trim the intervals to the lexical scope.
877
878 LexicalScope *Scope = LS.findLexicalScope(dl);
879 if (!Scope)
880 return;
881
882 SlotIndex PrevEnd;
883 LocMap::iterator I = locInts.begin();
884
885 // Iterate over the lexical scope ranges. Each time round the loop
886 // we check the intervals for overlap with the end of the previous
887 // range and the start of the next. The first range is handled as
888 // a special case where there is no PrevEnd.
889 for (const InsnRange &Range : Scope->getRanges()) {
890 SlotIndex RStart = LIS.getInstructionIndex(*Range.first);
891 SlotIndex REnd = LIS.getInstructionIndex(*Range.second);
892
893 // At the start of each iteration I has been advanced so that
894 // I.stop() >= PrevEnd. Check for overlap.
895 if (PrevEnd && I.start() < PrevEnd) {
896 SlotIndex IStop = I.stop();
897 DbgValueLocation Loc = I.value();
898
899 // Stop overlaps previous end - trim the end of the interval to
900 // the scope range.
901 I.setStopUnchecked(PrevEnd);
902 ++I;
903
904 // If the interval also overlaps the start of the "next" (i.e.
905 // current) range create a new interval for the remainder
906 if (RStart < IStop)
907 I.insert(RStart, IStop, Loc);
908 }
909
910 // Advance I so that I.stop() >= RStart, and check for overlap.
911 I.advanceTo(RStart);
912 if (!I.valid())
913 return;
914
915 // The end of a lexical scope range is the last instruction in the
916 // range. To convert to an interval we need the index of the
917 // instruction after it.
918 REnd = REnd.getNextIndex();
919
920 // Advance I to first interval outside current range.
921 I.advanceTo(REnd);
922 if (!I.valid())
923 return;
924
925 PrevEnd = REnd;
926 }
927
928 // Check for overlap with end of final range.
929 if (PrevEnd && I.start() < PrevEnd)
930 I.setStopUnchecked(PrevEnd);
931}
932
933void LDVImpl::computeIntervals() {
934 LexicalScopes LS;
935 LS.initialize(*MF);
936
937 for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
938 userValues[i]->computeIntervals(MF->getRegInfo(), *TRI, *LIS, LS);
939 userValues[i]->mapVirtRegs(this);
940 }
941}
942
943bool LDVImpl::runOnMachineFunction(MachineFunction &mf) {
944 clear();
945 MF = &mf;
946 LIS = &pass.getAnalysis<LiveIntervals>();
947 TRI = mf.getSubtarget().getRegisterInfo();
948 LLVM_DEBUG(dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
<< mf.getName() << " **********\n"; } } while (false
)
949 << mf.getName() << " **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "********** COMPUTING LIVE DEBUG VARIABLES: "
<< mf.getName() << " **********\n"; } } while (false
)
;
950
951 bool Changed = collectDebugValues(mf);
952 computeIntervals();
953 LLVM_DEBUG(print(dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { print(dbgs()); } } while (false)
;
954 ModifiedMF = Changed;
955 return Changed;
956}
957
958static void removeDebugValues(MachineFunction &mf) {
959 for (MachineBasicBlock &MBB : mf) {
960 for (auto MBBI = MBB.begin(), MBBE = MBB.end(); MBBI != MBBE; ) {
961 if (!MBBI->isDebugValue()) {
962 ++MBBI;
963 continue;
964 }
965 MBBI = MBB.erase(MBBI);
966 }
967 }
968}
969
970bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
971 if (!EnableLDV)
972 return false;
973 if (!mf.getFunction().getSubprogram()) {
974 removeDebugValues(mf);
975 return false;
976 }
977 if (!pImpl)
978 pImpl = new LDVImpl(this);
979 return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);
980}
981
982void LiveDebugVariables::releaseMemory() {
983 if (pImpl)
984 static_cast<LDVImpl*>(pImpl)->clear();
985}
986
987LiveDebugVariables::~LiveDebugVariables() {
988 if (pImpl)
989 delete static_cast<LDVImpl*>(pImpl);
990}
991
992//===----------------------------------------------------------------------===//
993// Live Range Splitting
994//===----------------------------------------------------------------------===//
995
996bool
997UserValue::splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
998 LiveIntervals& LIS) {
999 LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Splitting Loc" <<
OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while
(false)
1000 dbgs() << "Splitting Loc" << OldLocNo << '\t';do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Splitting Loc" <<
OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while
(false)
1001 print(dbgs(), nullptr);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Splitting Loc" <<
OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while
(false)
1002 })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Splitting Loc" <<
OldLocNo << '\t'; print(dbgs(), nullptr); }; } } while
(false)
;
1003 bool DidChange = false;
1004 LocMap::iterator LocMapI;
1005 LocMapI.setMap(locInts);
1006 for (unsigned i = 0; i != NewRegs.size(); ++i) {
1007 LiveInterval *LI = &LIS.getInterval(NewRegs[i]);
1008 if (LI->empty())
1009 continue;
1010
1011 // Don't allocate the new LocNo until it is needed.
1012 unsigned NewLocNo = UndefLocNo;
1013
1014 // Iterate over the overlaps between locInts and LI.
1015 LocMapI.find(LI->beginIndex());
1016 if (!LocMapI.valid())
1017 continue;
1018 LiveInterval::iterator LII = LI->advanceTo(LI->begin(), LocMapI.start());
1019 LiveInterval::iterator LIE = LI->end();
1020 while (LocMapI.valid() && LII != LIE) {
1021 // At this point, we know that LocMapI.stop() > LII->start.
1022 LII = LI->advanceTo(LII, LocMapI.start());
1023 if (LII == LIE)
1024 break;
1025
1026 // Now LII->end > LocMapI.start(). Do we have an overlap?
1027 if (LocMapI.value().locNo() == OldLocNo && LII->start < LocMapI.stop()) {
1028 // Overlapping correct location. Allocate NewLocNo now.
1029 if (NewLocNo == UndefLocNo) {
1030 MachineOperand MO = MachineOperand::CreateReg(LI->reg, false);
1031 MO.setSubReg(locations[OldLocNo].getSubReg());
1032 NewLocNo = getLocationNo(MO);
1033 DidChange = true;
1034 }
1035
1036 SlotIndex LStart = LocMapI.start();
1037 SlotIndex LStop = LocMapI.stop();
1038 DbgValueLocation OldLoc = LocMapI.value();
1039
1040 // Trim LocMapI down to the LII overlap.
1041 if (LStart < LII->start)
1042 LocMapI.setStartUnchecked(LII->start);
1043 if (LStop > LII->end)
1044 LocMapI.setStopUnchecked(LII->end);
1045
1046 // Change the value in the overlap. This may trigger coalescing.
1047 LocMapI.setValue(OldLoc.changeLocNo(NewLocNo));
1048
1049 // Re-insert any removed OldLocNo ranges.
1050 if (LStart < LocMapI.start()) {
1051 LocMapI.insert(LStart, LocMapI.start(), OldLoc);
1052 ++LocMapI;
1053 assert(LocMapI.valid() && "Unexpected coalescing")((LocMapI.valid() && "Unexpected coalescing") ? static_cast
<void> (0) : __assert_fail ("LocMapI.valid() && \"Unexpected coalescing\""
, "/build/llvm-toolchain-snapshot-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 1053, __PRETTY_FUNCTION__))
;
1054 }
1055 if (LStop > LocMapI.stop()) {
1056 ++LocMapI;
1057 LocMapI.insert(LII->end, LStop, OldLoc);
1058 --LocMapI;
1059 }
1060 }
1061
1062 // Advance to the next overlap.
1063 if (LII->end < LocMapI.stop()) {
1064 if (++LII == LIE)
1065 break;
1066 LocMapI.advanceTo(LII->start);
1067 } else {
1068 ++LocMapI;
1069 if (!LocMapI.valid())
1070 break;
1071 LII = LI->advanceTo(LII, LocMapI.start());
1072 }
1073 }
1074 }
1075
1076 // Finally, remove any remaining OldLocNo intervals and OldLocNo itself.
1077 locations.erase(locations.begin() + OldLocNo);
1078 LocMapI.goToBegin();
1079 while (LocMapI.valid()) {
1080 DbgValueLocation v = LocMapI.value();
1081 if (v.locNo() == OldLocNo) {
1082 LLVM_DEBUG(dbgs() << "Erasing [" << LocMapI.start() << ';'do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Erasing [" << LocMapI
.start() << ';' << LocMapI.stop() << ")\n";
} } while (false)
1083 << LocMapI.stop() << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "Erasing [" << LocMapI
.start() << ';' << LocMapI.stop() << ")\n";
} } while (false)
;
1084 LocMapI.erase();
1085 } else {
1086 // Undef values always have location number UndefLocNo, so don't change
1087 // locNo in that case. See getLocationNo().
1088 if (!v.isUndef() && v.locNo() > OldLocNo)
1089 LocMapI.setValueUnchecked(v.changeLocNo(v.locNo() - 1));
1090 ++LocMapI;
1091 }
1092 }
1093
1094 LLVM_DEBUG({do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Split result: \t"; print
(dbgs(), nullptr); }; } } while (false)
1095 dbgs() << "Split result: \t";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Split result: \t"; print
(dbgs(), nullptr); }; } } while (false)
1096 print(dbgs(), nullptr);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Split result: \t"; print
(dbgs(), nullptr); }; } } while (false)
1097 })do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { { dbgs() << "Split result: \t"; print
(dbgs(), nullptr); }; } } while (false)
;
1098 return DidChange;
1099}
1100
1101bool
1102UserValue::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
1103 LiveIntervals &LIS) {
1104 bool DidChange = false;
1105 // Split locations referring to OldReg. Iterate backwards so splitLocation can
1106 // safely erase unused locations.
1107 for (unsigned i = locations.size(); i ; --i) {
1108 unsigned LocNo = i-1;
1109 const MachineOperand *Loc = &locations[LocNo];
1110 if (!Loc->isReg() || Loc->getReg() != OldReg)
1111 continue;
1112 DidChange |= splitLocation(LocNo, NewRegs, LIS);
1113 }
1114 return DidChange;
1115}
1116
1117void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs) {
1118 bool DidChange = false;
1119 for (UserValue *UV = lookupVirtReg(OldReg); UV; UV = UV->getNext())
1120 DidChange |= UV->splitRegister(OldReg, NewRegs, *LIS);
1121
1122 if (!DidChange)
1123 return;
1124
1125 // Map all of the new virtual registers.
1126 UserValue *UV = lookupVirtReg(OldReg);
1127 for (unsigned i = 0; i != NewRegs.size(); ++i)
1128 mapVirtReg(NewRegs[i], UV);
1129}
1130
1131void LiveDebugVariables::
1132splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, LiveIntervals &LIS) {
1133 if (pImpl)
1134 static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs);
1135}
1136
1137void UserValue::rewriteLocations(VirtRegMap &VRM, const MachineFunction &MF,
1138 const TargetInstrInfo &TII,
1139 const TargetRegisterInfo &TRI,
1140 SpillOffsetMap &SpillOffsets) {
1141 // Build a set of new locations with new numbers so we can coalesce our
1142 // IntervalMap if two vreg intervals collapse to the same physical location.
1143 // Use MapVector instead of SetVector because MapVector::insert returns the
1144 // position of the previously or newly inserted element. The boolean value
1145 // tracks if the location was produced by a spill.
1146 // FIXME: This will be problematic if we ever support direct and indirect
1147 // frame index locations, i.e. expressing both variables in memory and
1148 // 'int x, *px = &x'. The "spilled" bit must become part of the location.
1149 MapVector<MachineOperand, std::pair<bool, unsigned>> NewLocations;
1150 SmallVector<unsigned, 4> LocNoMap(locations.size());
1151 for (unsigned I = 0, E = locations.size(); I != E; ++I) {
1152 bool Spilled = false;
1153 unsigned SpillOffset = 0;
1154 MachineOperand Loc = locations[I];
1155 // Only virtual registers are rewritten.
1156 if (Loc.isReg() && Loc.getReg() &&
1157 Register::isVirtualRegister(Loc.getReg())) {
1158 Register VirtReg = Loc.getReg();
1159 if (VRM.isAssignedReg(VirtReg) &&
1160 Register::isPhysicalRegister(VRM.getPhys(VirtReg))) {
1161 // This can create a %noreg operand in rare cases when the sub-register
1162 // index is no longer available. That means the user value is in a
1163 // non-existent sub-register, and %noreg is exactly what we want.
1164 Loc.substPhysReg(VRM.getPhys(VirtReg), TRI);
1165 } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) {
1166 // Retrieve the stack slot offset.
1167 unsigned SpillSize;
1168 const MachineRegisterInfo &MRI = MF.getRegInfo();
1169 const TargetRegisterClass *TRC = MRI.getRegClass(VirtReg);
1170 bool Success = TII.getStackSlotRange(TRC, Loc.getSubReg(), SpillSize,
1171 SpillOffset, MF);
1172
1173 // FIXME: Invalidate the location if the offset couldn't be calculated.
1174 (void)Success;
1175
1176 Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg));
1177 Spilled = true;
1178 } else {
1179 Loc.setReg(0);
1180 Loc.setSubReg(0);
1181 }
1182 }
1183
1184 // Insert this location if it doesn't already exist and record a mapping
1185 // from the old number to the new number.
1186 auto InsertResult = NewLocations.insert({Loc, {Spilled, SpillOffset}});
1187 unsigned NewLocNo = std::distance(NewLocations.begin(), InsertResult.first);
1188 LocNoMap[I] = NewLocNo;
1189 }
1190
1191 // Rewrite the locations and record the stack slot offsets for spills.
1192 locations.clear();
1193 SpillOffsets.clear();
1194 for (auto &Pair : NewLocations) {
1195 bool Spilled;
1196 unsigned SpillOffset;
1197 std::tie(Spilled, SpillOffset) = Pair.second;
1198 locations.push_back(Pair.first);
1199 if (Spilled) {
1200 unsigned NewLocNo = std::distance(&*NewLocations.begin(), &Pair);
1201 SpillOffsets[NewLocNo] = SpillOffset;
1202 }
1203 }
1204
1205 // Update the interval map, but only coalesce left, since intervals to the
1206 // right use the old location numbers. This should merge two contiguous
1207 // DBG_VALUE intervals with different vregs that were allocated to the same
1208 // physical register.
1209 for (LocMap::iterator I = locInts.begin(); I.valid(); ++I) {
1210 DbgValueLocation Loc = I.value();
1211 // Undef values don't exist in locations (and thus not in LocNoMap either)
1212 // so skip over them. See getLocationNo().
1213 if (Loc.isUndef())
1214 continue;
1215 unsigned NewLocNo = LocNoMap[Loc.locNo()];
1216 I.setValueUnchecked(Loc.changeLocNo(NewLocNo));
1217 I.setStart(I.start());
1218 }
1219}
1220
1221/// Find an iterator for inserting a DBG_VALUE instruction.
1222static MachineBasicBlock::iterator
1223findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx,
1224 LiveIntervals &LIS) {
1225 SlotIndex Start = LIS.getMBBStartIdx(MBB);
1226 Idx = Idx.getBaseIndex();
1227
1228 // Try to find an insert location by going backwards from Idx.
1229 MachineInstr *MI;
1230 while (!(MI = LIS.getInstructionFromIndex(Idx))) {
1231 // We've reached the beginning of MBB.
1232 if (Idx == Start) {
1233 MachineBasicBlock::iterator I = MBB->SkipPHIsLabelsAndDebug(MBB->begin());
1234 return I;
1235 }
1236 Idx = Idx.getPrevIndex();
1237 }
1238
1239 // Don't insert anything after the first terminator, though.
1240 return MI->isTerminator() ? MBB->getFirstTerminator() :
1241 std::next(MachineBasicBlock::iterator(MI));
1242}
1243
1244/// Find an iterator for inserting the next DBG_VALUE instruction
1245/// (or end if no more insert locations found).
1246static MachineBasicBlock::iterator
1247findNextInsertLocation(MachineBasicBlock *MBB,
1248 MachineBasicBlock::iterator I,
1249 SlotIndex StopIdx, MachineOperand &LocMO,
1250 LiveIntervals &LIS,
1251 const TargetRegisterInfo &TRI) {
1252 if (!LocMO.isReg())
1253 return MBB->instr_end();
1254 Register Reg = LocMO.getReg();
1255
1256 // Find the next instruction in the MBB that define the register Reg.
1257 while (I != MBB->end() && !I->isTerminator()) {
1258 if (!LIS.isNotInMIMap(*I) &&
1259 SlotIndex::isEarlierEqualInstr(StopIdx, LIS.getInstructionIndex(*I)))
1260 break;
1261 if (I->definesRegister(Reg, &TRI))
1262 // The insert location is directly after the instruction/bundle.
1263 return std::next(I);
1264 ++I;
1265 }
1266 return MBB->end();
1267}
1268
1269void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex StartIdx,
1270 SlotIndex StopIdx, DbgValueLocation Loc,
1271 bool Spilled, unsigned SpillOffset,
1272 LiveIntervals &LIS, const TargetInstrInfo &TII,
1273 const TargetRegisterInfo &TRI) {
1274 SlotIndex MBBEndIdx = LIS.getMBBEndIdx(&*MBB);
1275 // Only search within the current MBB.
1276 StopIdx = (MBBEndIdx < StopIdx) ? MBBEndIdx : StopIdx;
1277 MachineBasicBlock::iterator I = findInsertLocation(MBB, StartIdx, LIS);
1278 // Undef values don't exist in locations so create new "noreg" register MOs
1279 // for them. See getLocationNo().
1280 MachineOperand MO = !Loc.isUndef() ?
1281 locations[Loc.locNo()] :
1282 MachineOperand::CreateReg(/* Reg */ 0, /* isDef */ false, /* isImp */ false,
1283 /* isKill */ false, /* isDead */ false,
1284 /* isUndef */ false, /* isEarlyClobber */ false,
1285 /* SubReg */ 0, /* isDebug */ true);
1286
1287 ++NumInsertedDebugValues;
1288
1289 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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 1291, __PRETTY_FUNCTION__))
1290 ->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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 1291, __PRETTY_FUNCTION__))
1291 "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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 1291, __PRETTY_FUNCTION__))
;
1292
1293 // If the location was spilled, the new DBG_VALUE will be indirect. If the
1294 // original DBG_VALUE was indirect, we need to add DW_OP_deref to indicate
1295 // that the original virtual register was a pointer. Also, add the stack slot
1296 // offset for the spilled register to the expression.
1297 const DIExpression *Expr = Expression;
1298 if (Spilled)
1299 Expr = DIExpression::prepend(Expr, DIExpression::ApplyOffset, SpillOffset);
1300
1301 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-10~svn374877/lib/CodeGen/LiveDebugVariables.cpp"
, 1301, __PRETTY_FUNCTION__))
;
1302
1303 do {
1304 BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE),
1305 Spilled, MO, Variable, Expr);
1306
1307 // Continue and insert DBG_VALUES after every redefinition of register
1308 // associated with the debug value within the range
1309 I = findNextInsertLocation(MBB, I, StopIdx, MO, LIS, TRI);
1310 } while (I != MBB->end());
1311}
1312
1313void UserLabel::insertDebugLabel(MachineBasicBlock *MBB, SlotIndex Idx,
1314 LiveIntervals &LIS,
1315 const TargetInstrInfo &TII) {
1316 MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS);
1317 ++NumInsertedDebugLabels;
1318 BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_LABEL))
1319 .addMetadata(Label);
1320}
1321
1322void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
1323 const TargetInstrInfo &TII,
1324 const TargetRegisterInfo &TRI,
1325 const SpillOffsetMap &SpillOffsets) {
1326 MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
1327
1328 for (LocMap::const_iterator I = locInts.begin(); I.valid();) {
1329 SlotIndex Start = I.start();
1330 SlotIndex Stop = I.stop();
1331 DbgValueLocation Loc = I.value();
1332 auto SpillIt =
1333 !Loc.isUndef() ? SpillOffsets.find(Loc.locNo()) : SpillOffsets.end();
1334 bool Spilled = SpillIt != SpillOffsets.end();
1335 unsigned SpillOffset = Spilled ? SpillIt->second : 0;
1336
1337 LLVM_DEBUG(dbgs() << "\t[" << Start << ';' << Stop << "):" << Loc.locNo())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "\t[" << Start <<
';' << Stop << "):" << Loc.locNo(); } } while
(false)
;
1338 MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start)->getIterator();
1339 SlotIndex MBBEnd = LIS.getMBBEndIdx(&*MBB);
1340
1341 LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB) << '-' << MBBEnd)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << ' ' << printMBBReference
(*MBB) << '-' << MBBEnd; } } while (false)
;
1342 insertDebugValue(&*MBB, Start, Stop, Loc, Spilled, SpillOffset, LIS, TII,
1343 TRI);
1344 // This interval may span multiple basic blocks.
1345 // Insert a DBG_VALUE into each one.
1346 while (Stop > MBBEnd) {
1347 // Move to the next block.
1348 Start = MBBEnd;
1349 if (++MBB == MFEnd)
1350 break;
1351 MBBEnd = LIS.getMBBEndIdx(&*MBB);
1352 LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB) << '-' << MBBEnd)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << ' ' << printMBBReference
(*MBB) << '-' << MBBEnd; } } while (false)
;
1353 insertDebugValue(&*MBB, Start, Stop, Loc, Spilled, SpillOffset, LIS, TII,
1354 TRI);
1355 }
1356 LLVM_DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << '\n'; } } while (false)
;
1357 if (MBB == MFEnd)
1358 break;
1359
1360 ++I;
1361 }
1362}
1363
1364void UserLabel::emitDebugLabel(LiveIntervals &LIS, const TargetInstrInfo &TII) {
1365 LLVM_DEBUG(dbgs() << "\t" << loc)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "\t" << loc; } } while
(false)
;
1366 MachineFunction::iterator MBB = LIS.getMBBFromIndex(loc)->getIterator();
1367
1368 LLVM_DEBUG(dbgs() << ' ' << printMBBReference(*MBB))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << ' ' << printMBBReference
(*MBB); } } while (false)
;
1369 insertDebugLabel(&*MBB, loc, LIS, TII);
1370
1371 LLVM_DEBUG(dbgs() << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << '\n'; } } while (false)
;
1372}
1373
1374void LDVImpl::emitDebugValues(VirtRegMap *VRM) {
1375 LLVM_DEBUG(dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "********** EMITTING LIVE DEBUG VARIABLES **********\n"
; } } while (false)
;
1376 if (!MF)
1377 return;
1378 const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
1379 SpillOffsetMap SpillOffsets;
1380 for (auto &userValue : userValues) {
1381 LLVM_DEBUG(userValue->print(dbgs(), TRI))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { userValue->print(dbgs(), TRI); } } while
(false)
;
1382 userValue->rewriteLocations(*VRM, *MF, *TII, *TRI, SpillOffsets);
1383 userValue->emitDebugValues(VRM, *LIS, *TII, *TRI, SpillOffsets);
1384 }
1385 LLVM_DEBUG(dbgs() << "********** EMITTING LIVE DEBUG LABELS **********\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { dbgs() << "********** EMITTING LIVE DEBUG LABELS **********\n"
; } } while (false)
;
1386 for (auto &userLabel : userLabels) {
1387 LLVM_DEBUG(userLabel->print(dbgs(), TRI))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("livedebugvars")) { userLabel->print(dbgs(), TRI); } } while
(false)
;
1388 userLabel->emitDebugLabel(*LIS, *TII);
1389 }
1390 EmitDone = true;
1391}
1392
1393void LiveDebugVariables::emitDebugValues(VirtRegMap *VRM) {
1394 if (pImpl)
1395 static_cast<LDVImpl*>(pImpl)->emitDebugValues(VRM);
1396}
1397
1398bool LiveDebugVariables::doInitialization(Module &M) {
1399 return Pass::doInitialization(M);
1400}
1401
1402#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
1403LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void LiveDebugVariables::dump() const {
1404 if (pImpl)
1
Assuming field 'pImpl' is non-null
2
Taking true branch
1405 static_cast<LDVImpl*>(pImpl)->print(dbgs());
3
Calling 'LDVImpl::print'
1406}
1407#endif