1 //===-- llvm/CodeGen/MachineModuleInfo.h ------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Collect meta information for a module. This information should be in a
11 // neutral form that can be used by different debugging and exception handling
14 // The organization of information is primarily clustered around the source
15 // compile units. The main exception is source line correspondence where
16 // inlining may interleave code from various compile units.
18 // The following information can be retrieved from the MachineModuleInfo.
20 // -- Source directories - Directories are uniqued based on their canonical
21 // string and assigned a sequential numeric ID (base 1.)
22 // -- Source files - Files are also uniqued based on their name and directory
23 // ID. A file ID is sequential number (base 1.)
24 // -- Source line correspondence - A vector of file ID, line#, column# triples.
25 // A DEBUG_LOCATION instruction is generated by the DAG Legalizer
26 // corresponding to each entry in the source line list. This allows a debug
27 // emitter to generate labels referenced by debug information tables.
29 //===----------------------------------------------------------------------===//
31 #ifndef LLVM_CODEGEN_MACHINEMODULEINFO_H
32 #define LLVM_CODEGEN_MACHINEMODULEINFO_H
34 #include "llvm/ADT/DenseMap.h"
35 #include "llvm/ADT/PointerIntPair.h"
36 #include "llvm/ADT/SmallPtrSet.h"
37 #include "llvm/ADT/SmallVector.h"
38 #include "llvm/Analysis/LibCallSemantics.h"
39 #include "llvm/IR/DebugLoc.h"
40 #include "llvm/IR/Metadata.h"
41 #include "llvm/IR/ValueHandle.h"
42 #include "llvm/MC/MCContext.h"
43 #include "llvm/MC/MachineLocation.h"
44 #include "llvm/Pass.h"
45 #include "llvm/Support/DataTypes.h"
46 #include "llvm/Support/Dwarf.h"
50 //===----------------------------------------------------------------------===//
51 // Forward declarations.
55 class MMIAddrLabelMap;
56 class MachineBasicBlock;
57 class MachineFunction;
63 //===----------------------------------------------------------------------===//
64 /// LandingPadInfo - This structure is used to retain landing pad info for
65 /// the current function.
67 struct LandingPadInfo {
68 MachineBasicBlock *LandingPadBlock; // Landing pad block.
69 SmallVector<MCSymbol *, 1> BeginLabels; // Labels prior to invoke.
70 SmallVector<MCSymbol *, 1> EndLabels; // Labels after invoke.
71 SmallVector<MCSymbol *, 1> ClauseLabels; // Labels for each clause.
72 MCSymbol *LandingPadLabel; // Label at beginning of landing pad.
73 const Function *Personality; // Personality function.
74 std::vector<int> TypeIds; // List of type ids (filters negative).
75 int WinEHState; // WinEH specific state number.
77 explicit LandingPadInfo(MachineBasicBlock *MBB)
78 : LandingPadBlock(MBB), LandingPadLabel(nullptr), Personality(nullptr),
82 //===----------------------------------------------------------------------===//
83 /// MachineModuleInfoImpl - This class can be derived from and used by targets
84 /// to hold private target-specific information for each Module. Objects of
85 /// type are accessed/created with MMI::getInfo and destroyed when the
86 /// MachineModuleInfo is destroyed.
88 class MachineModuleInfoImpl {
90 typedef PointerIntPair<MCSymbol*, 1, bool> StubValueTy;
91 virtual ~MachineModuleInfoImpl();
92 typedef std::vector<std::pair<MCSymbol*, StubValueTy> > SymbolListTy;
95 /// Return the entries from a DenseMap in a deterministic sorted orer.
97 static SymbolListTy getSortedStubs(DenseMap<MCSymbol*, StubValueTy>&);
100 //===----------------------------------------------------------------------===//
101 /// MachineModuleInfo - This class contains meta information specific to a
102 /// module. Queries can be made by different debugging and exception handling
103 /// schemes and reformated for specific use.
105 class MachineModuleInfo : public ImmutablePass {
106 /// Context - This is the MCContext used for the entire code generator.
109 /// TheModule - This is the LLVM Module being worked on.
110 const Module *TheModule;
112 /// ObjFileMMI - This is the object-file-format-specific implementation of
113 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
115 MachineModuleInfoImpl *ObjFileMMI;
117 /// List of moves done by a function's prolog. Used to construct frame maps
118 /// by debug and exception handling consumers.
119 std::vector<MCCFIInstruction> FrameInstructions;
121 /// LandingPads - List of LandingPadInfo describing the landing pad
122 /// information in the current function.
123 std::vector<LandingPadInfo> LandingPads;
125 /// LPadToCallSiteMap - Map a landing pad's EH symbol to the call site
127 DenseMap<MCSymbol*, SmallVector<unsigned, 4> > LPadToCallSiteMap;
129 /// CallSiteMap - Map of invoke call site index values to associated begin
130 /// EH_LABEL for the current function.
131 DenseMap<MCSymbol*, unsigned> CallSiteMap;
133 /// CurCallSite - The current call site index being processed, if any. 0 if
135 unsigned CurCallSite;
137 /// TypeInfos - List of C++ TypeInfo used in the current function.
138 std::vector<const GlobalValue *> TypeInfos;
140 /// FilterIds - List of typeids encoding filters used in the current function.
141 std::vector<unsigned> FilterIds;
143 /// FilterEnds - List of the indices in FilterIds corresponding to filter
145 std::vector<unsigned> FilterEnds;
147 /// Personalities - Vector of all personality functions ever seen. Used to
148 /// emit common EH frames.
149 std::vector<const Function *> Personalities;
151 /// UsedFunctions - The functions in the @llvm.used list in a more easily
152 /// searchable format. This does not include the functions in
153 /// llvm.compiler.used.
154 SmallPtrSet<const Function *, 32> UsedFunctions;
156 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
157 /// the specified basic block's address of label.
158 MMIAddrLabelMap *AddrLabelSymbols;
161 bool CallsUnwindInit;
163 /// DbgInfoAvailable - True if debugging information is available
165 bool DbgInfoAvailable;
167 /// UsesVAFloatArgument - True if this module calls VarArg function with
168 /// floating-point arguments. This is used to emit an undefined reference
169 /// to _fltused on Windows targets.
170 bool UsesVAFloatArgument;
172 /// UsesMorestackAddr - True if the module calls the __morestack function
173 /// indirectly, as is required under the large code model on x86. This is used
174 /// to emit a definition of a symbol, __morestack_addr, containing the
175 /// address. See comments in lib/Target/X86/X86FrameLowering.cpp for more
177 bool UsesMorestackAddr;
179 EHPersonality PersonalityTypeCache;
181 DenseMap<const Function *, std::unique_ptr<WinEHFuncInfo>> FuncInfoMap;
184 static char ID; // Pass identification, replacement for typeid
186 struct VariableDbgInfo {
187 const MDLocalVariable *Var;
188 const MDExpression *Expr;
190 const MDLocation *Loc;
192 VariableDbgInfo(const MDLocalVariable *Var, const MDExpression *Expr,
193 unsigned Slot, const MDLocation *Loc)
194 : Var(Var), Expr(Expr), Slot(Slot), Loc(Loc) {}
196 typedef SmallVector<VariableDbgInfo, 4> VariableDbgInfoMapTy;
197 VariableDbgInfoMapTy VariableDbgInfos;
199 MachineModuleInfo(); // DUMMY CONSTRUCTOR, DO NOT CALL.
201 MachineModuleInfo(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
202 const MCObjectFileInfo *MOFI);
203 ~MachineModuleInfo() override;
205 // Initialization and Finalization
206 bool doInitialization(Module &) override;
207 bool doFinalization(Module &) override;
209 /// EndFunction - Discard function meta information.
213 const MCContext &getContext() const { return Context; }
214 MCContext &getContext() { return Context; }
216 void setModule(const Module *M) { TheModule = M; }
217 const Module *getModule() const { return TheModule; }
219 const Function *getWinEHParent(const Function *F) const;
220 WinEHFuncInfo &getWinEHFuncInfo(const Function *F);
221 bool hasWinEHFuncInfo(const Function *F) const {
222 return FuncInfoMap.count(getWinEHParent(F)) > 0;
225 /// getInfo - Keep track of various per-function pieces of information for
226 /// backends that would like to do so.
228 template<typename Ty>
229 Ty &getObjFileInfo() {
230 if (ObjFileMMI == nullptr)
231 ObjFileMMI = new Ty(*this);
232 return *static_cast<Ty*>(ObjFileMMI);
235 template<typename Ty>
236 const Ty &getObjFileInfo() const {
237 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
240 /// AnalyzeModule - Scan the module for global debug information.
242 void AnalyzeModule(const Module &M);
244 /// hasDebugInfo - Returns true if valid debug info is present.
246 bool hasDebugInfo() const { return DbgInfoAvailable; }
247 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
249 bool callsEHReturn() const { return CallsEHReturn; }
250 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
252 bool callsUnwindInit() const { return CallsUnwindInit; }
253 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
255 bool usesVAFloatArgument() const {
256 return UsesVAFloatArgument;
259 void setUsesVAFloatArgument(bool b) {
260 UsesVAFloatArgument = b;
263 bool usesMorestackAddr() const {
264 return UsesMorestackAddr;
267 void setUsesMorestackAddr(bool b) {
268 UsesMorestackAddr = b;
271 /// \brief Returns a reference to a list of cfi instructions in the current
272 /// function's prologue. Used to construct frame maps for debug and exception
273 /// handling comsumers.
274 const std::vector<MCCFIInstruction> &getFrameInstructions() const {
275 return FrameInstructions;
278 unsigned LLVM_ATTRIBUTE_UNUSED_RESULT
279 addFrameInst(const MCCFIInstruction &Inst) {
280 FrameInstructions.push_back(Inst);
281 return FrameInstructions.size() - 1;
284 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
285 /// block when its address is taken. This cannot be its normal LBB label
286 /// because the block may be accessed outside its containing function.
287 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB);
289 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
290 /// basic block when its address is taken. If other blocks were RAUW'd to
291 /// this one, we may have to emit them as well, return the whole set.
292 std::vector<MCSymbol*> getAddrLabelSymbolToEmit(const BasicBlock *BB);
294 /// takeDeletedSymbolsForFunction - If the specified function has had any
295 /// references to address-taken blocks generated, but the block got deleted,
296 /// return the symbol now so we can emit it. This prevents emitting a
297 /// reference to a symbol that has no definition.
298 void takeDeletedSymbolsForFunction(const Function *F,
299 std::vector<MCSymbol*> &Result);
302 //===- EH ---------------------------------------------------------------===//
304 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
305 /// specified MachineBasicBlock.
306 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
308 /// addInvoke - Provide the begin and end labels of an invoke style call and
309 /// associate it with a try landing pad block.
310 void addInvoke(MachineBasicBlock *LandingPad,
311 MCSymbol *BeginLabel, MCSymbol *EndLabel);
313 /// addLandingPad - Add a new panding pad. Returns the label ID for the
314 /// landing pad entry.
315 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
317 /// addPersonality - Provide the personality function for the exception
319 void addPersonality(MachineBasicBlock *LandingPad,
320 const Function *Personality);
322 void addWinEHState(MachineBasicBlock *LandingPad, int State);
324 /// getPersonalityIndex - Get index of the current personality function inside
325 /// Personalitites array
326 unsigned getPersonalityIndex() const;
328 /// getPersonalities - Return array of personality functions ever seen.
329 const std::vector<const Function *>& getPersonalities() const {
330 return Personalities;
333 /// isUsedFunction - Return true if the functions in the llvm.used list. This
334 /// does not return true for things in llvm.compiler.used unless they are also
336 bool isUsedFunction(const Function *F) const {
337 return UsedFunctions.count(F);
340 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
342 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
343 ArrayRef<const GlobalValue *> TyInfo);
345 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
347 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
348 ArrayRef<const GlobalValue *> TyInfo);
350 /// addCleanup - Add a cleanup action for a landing pad.
352 void addCleanup(MachineBasicBlock *LandingPad);
354 /// Add a clause for a landing pad. Returns a new label for the clause. This
355 /// is used by EH schemes that have more than one landing pad. In this case,
356 /// each clause gets its own basic block.
357 MCSymbol *addClauseForLandingPad(MachineBasicBlock *LandingPad);
359 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
361 unsigned getTypeIDFor(const GlobalValue *TI);
363 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
365 int getFilterIDFor(std::vector<unsigned> &TyIds);
367 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
369 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = nullptr);
371 /// getLandingPads - Return a reference to the landing pad info for the
372 /// current function.
373 const std::vector<LandingPadInfo> &getLandingPads() const {
377 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call
379 void setCallSiteLandingPad(MCSymbol *Sym, ArrayRef<unsigned> Sites);
381 /// getCallSiteLandingPad - Get the call site indexes for a landing pad EH
383 SmallVectorImpl<unsigned> &getCallSiteLandingPad(MCSymbol *Sym) {
384 assert(hasCallSiteLandingPad(Sym) &&
385 "missing call site number for landing pad!");
386 return LPadToCallSiteMap[Sym];
389 /// hasCallSiteLandingPad - Return true if the landing pad Eh symbol has an
390 /// associated call site.
391 bool hasCallSiteLandingPad(MCSymbol *Sym) {
392 return !LPadToCallSiteMap[Sym].empty();
395 /// setCallSiteBeginLabel - Map the begin label for a call site.
396 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
397 CallSiteMap[BeginLabel] = Site;
400 /// getCallSiteBeginLabel - Get the call site number for a begin label.
401 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
402 assert(hasCallSiteBeginLabel(BeginLabel) &&
403 "Missing call site number for EH_LABEL!");
404 return CallSiteMap[BeginLabel];
407 /// hasCallSiteBeginLabel - Return true if the begin label has a call site
408 /// number associated with it.
409 bool hasCallSiteBeginLabel(MCSymbol *BeginLabel) {
410 return CallSiteMap[BeginLabel] != 0;
413 /// setCurrentCallSite - Set the call site currently being processed.
414 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
416 /// getCurrentCallSite - Get the call site currently being processed, if any.
417 /// return zero if none.
418 unsigned getCurrentCallSite() { return CurCallSite; }
420 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
422 const std::vector<const GlobalValue *> &getTypeInfos() const {
426 /// getFilterIds - Return a reference to the typeids encoding filters used in
427 /// the current function.
428 const std::vector<unsigned> &getFilterIds() const {
432 /// getPersonality - Return a personality function if available. The presence
433 /// of one is required to emit exception handling info.
434 const Function *getPersonality() const;
436 /// Classify the personality function amongst known EH styles.
437 EHPersonality getPersonalityType();
439 /// setVariableDbgInfo - Collect information used to emit debugging
440 /// information of a variable.
441 void setVariableDbgInfo(const MDLocalVariable *Var, const MDExpression *Expr,
442 unsigned Slot, const MDLocation *Loc) {
443 VariableDbgInfos.emplace_back(Var, Expr, Slot, Loc);
446 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfos; }
448 }; // End class MachineModuleInfo
450 } // End llvm namespace