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/EHPersonalities.h"
39 #include "llvm/IR/DebugLoc.h"
40 #include "llvm/IR/ValueHandle.h"
41 #include "llvm/MC/MCContext.h"
42 #include "llvm/MC/MCSymbol.h"
43 #include "llvm/MC/MachineLocation.h"
44 #include "llvm/Pass.h"
45 #include "llvm/Support/DataTypes.h"
49 //===----------------------------------------------------------------------===//
50 // Forward declarations.
55 class MMIAddrLabelMap;
56 class MachineBasicBlock;
57 class MachineFunction;
58 class MachineFunctionInitializer;
64 // Filter or finally function. Null indicates a catch-all.
65 const Function *FilterOrFinally;
67 // Address of block to recover at. Null for a finally handler.
68 const BlockAddress *RecoverBA;
71 //===----------------------------------------------------------------------===//
72 /// LandingPadInfo - This structure is used to retain landing pad info for
73 /// the current function.
75 struct LandingPadInfo {
76 MachineBasicBlock *LandingPadBlock; // Landing pad block.
77 SmallVector<MCSymbol *, 1> BeginLabels; // Labels prior to invoke.
78 SmallVector<MCSymbol *, 1> EndLabels; // Labels after invoke.
79 SmallVector<SEHHandler, 1> SEHHandlers; // SEH handlers active at this lpad.
80 MCSymbol *LandingPadLabel; // Label at beginning of landing pad.
81 std::vector<int> TypeIds; // List of type ids (filters negative).
83 explicit LandingPadInfo(MachineBasicBlock *MBB)
84 : LandingPadBlock(MBB), LandingPadLabel(nullptr) {}
87 //===----------------------------------------------------------------------===//
88 /// MachineModuleInfoImpl - This class can be derived from and used by targets
89 /// to hold private target-specific information for each Module. Objects of
90 /// type are accessed/created with MMI::getInfo and destroyed when the
91 /// MachineModuleInfo is destroyed.
93 class MachineModuleInfoImpl {
95 typedef PointerIntPair<MCSymbol*, 1, bool> StubValueTy;
96 virtual ~MachineModuleInfoImpl();
97 typedef std::vector<std::pair<MCSymbol*, StubValueTy> > SymbolListTy;
100 /// Return the entries from a DenseMap in a deterministic sorted orer.
102 static SymbolListTy getSortedStubs(DenseMap<MCSymbol*, StubValueTy>&);
105 //===----------------------------------------------------------------------===//
106 /// MachineModuleInfo - This class contains meta information specific to a
107 /// module. Queries can be made by different debugging and exception handling
108 /// schemes and reformated for specific use.
110 class MachineModuleInfo : public ImmutablePass {
111 const TargetMachine &TM;
113 /// Context - This is the MCContext used for the entire code generator.
116 /// TheModule - This is the LLVM Module being worked on.
117 const Module *TheModule;
119 /// ObjFileMMI - This is the object-file-format-specific implementation of
120 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
122 MachineModuleInfoImpl *ObjFileMMI;
124 /// List of moves done by a function's prolog. Used to construct frame maps
125 /// by debug and exception handling consumers.
126 std::vector<MCCFIInstruction> FrameInstructions;
128 /// LandingPads - List of LandingPadInfo describing the landing pad
129 /// information in the current function.
130 std::vector<LandingPadInfo> LandingPads;
132 /// LPadToCallSiteMap - Map a landing pad's EH symbol to the call site
134 DenseMap<MCSymbol*, SmallVector<unsigned, 4> > LPadToCallSiteMap;
136 /// CallSiteMap - Map of invoke call site index values to associated begin
137 /// EH_LABEL for the current function.
138 DenseMap<MCSymbol*, unsigned> CallSiteMap;
140 /// CurCallSite - The current call site index being processed, if any. 0 if
142 unsigned CurCallSite;
144 /// TypeInfos - List of C++ TypeInfo used in the current function.
145 std::vector<const GlobalValue *> TypeInfos;
147 /// FilterIds - List of typeids encoding filters used in the current function.
148 std::vector<unsigned> FilterIds;
150 /// FilterEnds - List of the indices in FilterIds corresponding to filter
152 std::vector<unsigned> FilterEnds;
154 /// Personalities - Vector of all personality functions ever seen. Used to
155 /// emit common EH frames.
156 std::vector<const Function *> Personalities;
158 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
159 /// the specified basic block's address of label.
160 MMIAddrLabelMap *AddrLabelSymbols;
163 bool CallsUnwindInit;
166 // TODO: Ideally, what we'd like is to have a switch that allows emitting
167 // synchronous (precise at call-sites only) CFA into .eh_frame. However,
168 // even under this switch, we'd like .debug_frame to be precise when using.
169 // -g. At this moment, there's no way to specify that some CFI directives
170 // go into .eh_frame only, while others go into .debug_frame only.
172 /// DbgInfoAvailable - True if debugging information is available
174 bool DbgInfoAvailable;
176 /// UsesVAFloatArgument - True if this module calls VarArg function with
177 /// floating-point arguments. This is used to emit an undefined reference
178 /// to _fltused on Windows targets.
179 bool UsesVAFloatArgument;
181 /// UsesMorestackAddr - True if the module calls the __morestack function
182 /// indirectly, as is required under the large code model on x86. This is used
183 /// to emit a definition of a symbol, __morestack_addr, containing the
184 /// address. See comments in lib/Target/X86/X86FrameLowering.cpp for more
186 bool UsesMorestackAddr;
188 EHPersonality PersonalityTypeCache;
190 MachineFunctionInitializer *MFInitializer;
191 /// Maps IR Functions to their corresponding MachineFunctions.
192 DenseMap<const Function*, std::unique_ptr<MachineFunction>> MachineFunctions;
193 /// Next unique number available for a MachineFunction.
194 unsigned NextFnNum = 0;
195 const Function *LastRequest = nullptr; ///< Used for shortcut/cache.
196 MachineFunction *LastResult = nullptr; ///< Used for shortcut/cache.
199 static char ID; // Pass identification, replacement for typeid
201 struct VariableDbgInfo {
202 const DILocalVariable *Var;
203 const DIExpression *Expr;
205 const DILocation *Loc;
207 VariableDbgInfo(const DILocalVariable *Var, const DIExpression *Expr,
208 unsigned Slot, const DILocation *Loc)
209 : Var(Var), Expr(Expr), Slot(Slot), Loc(Loc) {}
211 typedef SmallVector<VariableDbgInfo, 4> VariableDbgInfoMapTy;
212 VariableDbgInfoMapTy VariableDbgInfos;
214 explicit MachineModuleInfo(const TargetMachine *TM = nullptr);
215 ~MachineModuleInfo() override;
217 // Initialization and Finalization
218 bool doInitialization(Module &) override;
219 bool doFinalization(Module &) override;
221 /// EndFunction - Discard function meta information.
225 const MCContext &getContext() const { return Context; }
226 MCContext &getContext() { return Context; }
228 void setModule(const Module *M) { TheModule = M; }
229 const Module *getModule() const { return TheModule; }
231 void setMachineFunctionInitializer(MachineFunctionInitializer *MFInit) {
232 MFInitializer = MFInit;
235 /// Returns the MachineFunction constructed for the IR function \p F.
236 /// Creates a new MachineFunction and runs the MachineFunctionInitializer
237 /// if none exists yet.
238 MachineFunction &getMachineFunction(const Function &F);
240 /// \brief Delete the MachineFunction \p MF and reset the link in the IR
241 /// Function to Machine Function map.
242 void deleteMachineFunctionFor(Function &F);
244 /// getInfo - Keep track of various per-function pieces of information for
245 /// backends that would like to do so.
247 template<typename Ty>
248 Ty &getObjFileInfo() {
249 if (ObjFileMMI == nullptr)
250 ObjFileMMI = new Ty(*this);
251 return *static_cast<Ty*>(ObjFileMMI);
254 template<typename Ty>
255 const Ty &getObjFileInfo() const {
256 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
259 /// hasDebugInfo - Returns true if valid debug info is present.
261 bool hasDebugInfo() const { return DbgInfoAvailable; }
262 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
264 bool callsEHReturn() const { return CallsEHReturn; }
265 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
267 bool callsUnwindInit() const { return CallsUnwindInit; }
268 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
270 bool hasEHFunclets() const { return HasEHFunclets; }
271 void setHasEHFunclets(bool V) { HasEHFunclets = V; }
273 bool usesVAFloatArgument() const {
274 return UsesVAFloatArgument;
277 void setUsesVAFloatArgument(bool b) {
278 UsesVAFloatArgument = b;
281 bool usesMorestackAddr() const {
282 return UsesMorestackAddr;
285 void setUsesMorestackAddr(bool b) {
286 UsesMorestackAddr = b;
289 /// \brief Returns a reference to a list of cfi instructions in the current
290 /// function's prologue. Used to construct frame maps for debug and exception
291 /// handling comsumers.
292 const std::vector<MCCFIInstruction> &getFrameInstructions() const {
293 return FrameInstructions;
296 LLVM_NODISCARD unsigned addFrameInst(const MCCFIInstruction &Inst) {
297 FrameInstructions.push_back(Inst);
298 return FrameInstructions.size() - 1;
301 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
302 /// block when its address is taken. This cannot be its normal LBB label
303 /// because the block may be accessed outside its containing function.
304 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB) {
305 return getAddrLabelSymbolToEmit(BB).front();
308 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
309 /// basic block when its address is taken. If other blocks were RAUW'd to
310 /// this one, we may have to emit them as well, return the whole set.
311 ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(const BasicBlock *BB);
313 /// takeDeletedSymbolsForFunction - If the specified function has had any
314 /// references to address-taken blocks generated, but the block got deleted,
315 /// return the symbol now so we can emit it. This prevents emitting a
316 /// reference to a symbol that has no definition.
317 void takeDeletedSymbolsForFunction(const Function *F,
318 std::vector<MCSymbol*> &Result);
321 //===- EH ---------------------------------------------------------------===//
323 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
324 /// specified MachineBasicBlock.
325 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
327 /// addInvoke - Provide the begin and end labels of an invoke style call and
328 /// associate it with a try landing pad block.
329 void addInvoke(MachineBasicBlock *LandingPad,
330 MCSymbol *BeginLabel, MCSymbol *EndLabel);
332 /// addLandingPad - Add a new panding pad. Returns the label ID for the
333 /// landing pad entry.
334 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
336 /// addPersonality - Provide the personality function for the exception
338 void addPersonality(const Function *Personality);
340 /// getPersonalities - Return array of personality functions ever seen.
341 const std::vector<const Function *>& getPersonalities() const {
342 return Personalities;
345 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
347 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
348 ArrayRef<const GlobalValue *> TyInfo);
350 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
352 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
353 ArrayRef<const GlobalValue *> TyInfo);
355 /// addCleanup - Add a cleanup action for a landing pad.
357 void addCleanup(MachineBasicBlock *LandingPad);
359 void addSEHCatchHandler(MachineBasicBlock *LandingPad, const Function *Filter,
360 const BlockAddress *RecoverLabel);
362 void addSEHCleanupHandler(MachineBasicBlock *LandingPad,
363 const Function *Cleanup);
365 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
367 unsigned getTypeIDFor(const GlobalValue *TI);
369 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
371 int getFilterIDFor(std::vector<unsigned> &TyIds);
373 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
375 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = nullptr);
377 /// getLandingPads - Return a reference to the landing pad info for the
378 /// current function.
379 const std::vector<LandingPadInfo> &getLandingPads() const {
383 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call
385 void setCallSiteLandingPad(MCSymbol *Sym, ArrayRef<unsigned> Sites);
387 /// getCallSiteLandingPad - Get the call site indexes for a landing pad EH
389 SmallVectorImpl<unsigned> &getCallSiteLandingPad(MCSymbol *Sym) {
390 assert(hasCallSiteLandingPad(Sym) &&
391 "missing call site number for landing pad!");
392 return LPadToCallSiteMap[Sym];
395 /// hasCallSiteLandingPad - Return true if the landing pad Eh symbol has an
396 /// associated call site.
397 bool hasCallSiteLandingPad(MCSymbol *Sym) {
398 return !LPadToCallSiteMap[Sym].empty();
401 /// setCallSiteBeginLabel - Map the begin label for a call site.
402 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
403 CallSiteMap[BeginLabel] = Site;
406 /// getCallSiteBeginLabel - Get the call site number for a begin label.
407 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
408 assert(hasCallSiteBeginLabel(BeginLabel) &&
409 "Missing call site number for EH_LABEL!");
410 return CallSiteMap[BeginLabel];
413 /// hasCallSiteBeginLabel - Return true if the begin label has a call site
414 /// number associated with it.
415 bool hasCallSiteBeginLabel(MCSymbol *BeginLabel) {
416 return CallSiteMap[BeginLabel] != 0;
419 /// setCurrentCallSite - Set the call site currently being processed.
420 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
422 /// getCurrentCallSite - Get the call site currently being processed, if any.
423 /// return zero if none.
424 unsigned getCurrentCallSite() { return CurCallSite; }
426 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
428 const std::vector<const GlobalValue *> &getTypeInfos() const {
432 /// getFilterIds - Return a reference to the typeids encoding filters used in
433 /// the current function.
434 const std::vector<unsigned> &getFilterIds() const {
438 /// setVariableDbgInfo - Collect information used to emit debugging
439 /// information of a variable.
440 void setVariableDbgInfo(const DILocalVariable *Var, const DIExpression *Expr,
441 unsigned Slot, const DILocation *Loc) {
442 VariableDbgInfos.emplace_back(Var, Expr, Slot, Loc);
445 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfos; }
447 }; // End class MachineModuleInfo
449 } // End llvm namespace