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/GlobalValue.h"
39 #include "llvm/MC/MCContext.h"
40 #include "llvm/MC/MachineLocation.h"
41 #include "llvm/Metadata.h"
42 #include "llvm/Pass.h"
43 #include "llvm/Support/DataTypes.h"
44 #include "llvm/Support/DebugLoc.h"
45 #include "llvm/Support/Dwarf.h"
46 #include "llvm/Support/ValueHandle.h"
50 //===----------------------------------------------------------------------===//
51 // Forward declarations.
55 class MMIAddrLabelMap;
56 class MachineBasicBlock;
57 class MachineFunction;
62 //===----------------------------------------------------------------------===//
63 /// LandingPadInfo - This structure is used to retain landing pad info for
64 /// the current function.
66 struct LandingPadInfo {
67 MachineBasicBlock *LandingPadBlock; // Landing pad block.
68 SmallVector<MCSymbol*, 1> BeginLabels; // Labels prior to invoke.
69 SmallVector<MCSymbol*, 1> EndLabels; // Labels after invoke.
70 MCSymbol *LandingPadLabel; // Label at beginning of landing pad.
71 const Function *Personality; // Personality function.
72 std::vector<int> TypeIds; // List of type ids (filters negative)
74 explicit LandingPadInfo(MachineBasicBlock *MBB)
75 : LandingPadBlock(MBB), LandingPadLabel(0), Personality(0) {}
78 //===----------------------------------------------------------------------===//
79 /// MachineModuleInfoImpl - This class can be derived from and used by targets
80 /// to hold private target-specific information for each Module. Objects of
81 /// type are accessed/created with MMI::getInfo and destroyed when the
82 /// MachineModuleInfo is destroyed.
84 class MachineModuleInfoImpl {
86 typedef PointerIntPair<MCSymbol*, 1, bool> StubValueTy;
87 virtual ~MachineModuleInfoImpl();
88 typedef std::vector<std::pair<MCSymbol*, StubValueTy> > SymbolListTy;
90 static SymbolListTy GetSortedStubs(const DenseMap<MCSymbol*, StubValueTy>&);
93 //===----------------------------------------------------------------------===//
94 /// MachineModuleInfo - This class contains meta information specific to a
95 /// module. Queries can be made by different debugging and exception handling
96 /// schemes and reformated for specific use.
98 class MachineModuleInfo : public ImmutablePass {
99 /// Context - This is the MCContext used for the entire code generator.
102 /// TheModule - This is the LLVM Module being worked on.
103 const Module *TheModule;
105 /// ObjFileMMI - This is the object-file-format-specific implementation of
106 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
108 MachineModuleInfoImpl *ObjFileMMI;
110 /// FrameMoves - List of moves done by a function's prolog. Used to construct
111 /// frame maps by debug and exception handling consumers.
112 std::vector<MachineMove> FrameMoves;
114 /// CompactUnwindEncoding - If the target supports it, this is the compact
115 /// unwind encoding. It replaces a function's CIE and FDE.
116 uint32_t CompactUnwindEncoding;
118 /// LandingPads - List of LandingPadInfo describing the landing pad
119 /// information in the current function.
120 std::vector<LandingPadInfo> LandingPads;
122 /// LPadToCallSiteMap - Map a landing pad's EH symbol to the call site
124 DenseMap<MCSymbol*, SmallVector<unsigned, 4> > LPadToCallSiteMap;
126 /// CallSiteMap - Map of invoke call site index values to associated begin
127 /// EH_LABEL for the current function.
128 DenseMap<MCSymbol*, unsigned> CallSiteMap;
130 /// CurCallSite - The current call site index being processed, if any. 0 if
132 unsigned CurCallSite;
134 /// TypeInfos - List of C++ TypeInfo used in the current function.
135 std::vector<const GlobalVariable *> TypeInfos;
137 /// FilterIds - List of typeids encoding filters used in the current function.
138 std::vector<unsigned> FilterIds;
140 /// FilterEnds - List of the indices in FilterIds corresponding to filter
142 std::vector<unsigned> FilterEnds;
144 /// Personalities - Vector of all personality functions ever seen. Used to
145 /// emit common EH frames.
146 std::vector<const Function *> Personalities;
148 /// UsedFunctions - The functions in the @llvm.used list in a more easily
149 /// searchable format. This does not include the functions in
150 /// llvm.compiler.used.
151 SmallPtrSet<const Function *, 32> UsedFunctions;
153 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
154 /// the specified basic block's address of label.
155 MMIAddrLabelMap *AddrLabelSymbols;
158 bool CallsUnwindInit;
160 /// DbgInfoAvailable - True if debugging information is available
162 bool DbgInfoAvailable;
164 /// UsesVAFloatArgument - True if this module calls VarArg function with
165 /// floating-point arguments. This is used to emit an undefined reference
166 /// to _fltused on Windows targets.
167 bool UsesVAFloatArgument;
170 static char ID; // Pass identification, replacement for typeid
172 typedef std::pair<unsigned, DebugLoc> UnsignedDebugLocPair;
173 typedef SmallVector<std::pair<TrackingVH<MDNode>, UnsignedDebugLocPair>, 4>
174 VariableDbgInfoMapTy;
175 VariableDbgInfoMapTy VariableDbgInfo;
177 MachineModuleInfo(); // DUMMY CONSTRUCTOR, DO NOT CALL.
179 MachineModuleInfo(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
180 const MCObjectFileInfo *MOFI);
181 ~MachineModuleInfo();
183 // Initialization and Finalization
184 virtual bool doInitialization(Module &);
185 virtual bool doFinalization(Module &);
187 /// EndFunction - Discard function meta information.
191 const MCContext &getContext() const { return Context; }
192 MCContext &getContext() { return Context; }
194 void setModule(const Module *M) { TheModule = M; }
195 const Module *getModule() const { return TheModule; }
197 /// getInfo - Keep track of various per-function pieces of information for
198 /// backends that would like to do so.
200 template<typename Ty>
201 Ty &getObjFileInfo() {
203 ObjFileMMI = new Ty(*this);
204 return *static_cast<Ty*>(ObjFileMMI);
207 template<typename Ty>
208 const Ty &getObjFileInfo() const {
209 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
212 /// AnalyzeModule - Scan the module for global debug information.
214 void AnalyzeModule(const Module &M);
216 /// hasDebugInfo - Returns true if valid debug info is present.
218 bool hasDebugInfo() const { return DbgInfoAvailable; }
219 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
221 bool callsEHReturn() const { return CallsEHReturn; }
222 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
224 bool callsUnwindInit() const { return CallsUnwindInit; }
225 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
227 bool usesVAFloatArgument() const {
228 return UsesVAFloatArgument;
231 void setUsesVAFloatArgument(bool b) {
232 UsesVAFloatArgument = b;
235 /// getFrameMoves - Returns a reference to a list of moves done in the current
236 /// function's prologue. Used to construct frame maps for debug and exception
237 /// handling comsumers.
238 std::vector<MachineMove> &getFrameMoves() { return FrameMoves; }
240 /// getCompactUnwindEncoding - Returns the compact unwind encoding for a
241 /// function if the target supports the encoding. This encoding replaces a
242 /// function's CIE and FDE.
243 uint32_t getCompactUnwindEncoding() const { return CompactUnwindEncoding; }
245 /// setCompactUnwindEncoding - Set the compact unwind encoding for a function
246 /// if the target supports the encoding.
247 void setCompactUnwindEncoding(uint32_t Enc) { CompactUnwindEncoding = Enc; }
249 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
250 /// block when its address is taken. This cannot be its normal LBB label
251 /// because the block may be accessed outside its containing function.
252 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB);
254 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
255 /// basic block when its address is taken. If other blocks were RAUW'd to
256 /// this one, we may have to emit them as well, return the whole set.
257 std::vector<MCSymbol*> getAddrLabelSymbolToEmit(const BasicBlock *BB);
259 /// takeDeletedSymbolsForFunction - If the specified function has had any
260 /// references to address-taken blocks generated, but the block got deleted,
261 /// return the symbol now so we can emit it. This prevents emitting a
262 /// reference to a symbol that has no definition.
263 void takeDeletedSymbolsForFunction(const Function *F,
264 std::vector<MCSymbol*> &Result);
267 //===- EH ---------------------------------------------------------------===//
269 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
270 /// specified MachineBasicBlock.
271 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
273 /// addInvoke - Provide the begin and end labels of an invoke style call and
274 /// associate it with a try landing pad block.
275 void addInvoke(MachineBasicBlock *LandingPad,
276 MCSymbol *BeginLabel, MCSymbol *EndLabel);
278 /// addLandingPad - Add a new panding pad. Returns the label ID for the
279 /// landing pad entry.
280 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
282 /// addPersonality - Provide the personality function for the exception
284 void addPersonality(MachineBasicBlock *LandingPad,
285 const Function *Personality);
287 /// getPersonalityIndex - Get index of the current personality function inside
288 /// Personalitites array
289 unsigned getPersonalityIndex() const;
291 /// getPersonalities - Return array of personality functions ever seen.
292 const std::vector<const Function *>& getPersonalities() const {
293 return Personalities;
296 /// isUsedFunction - Return true if the functions in the llvm.used list. This
297 /// does not return true for things in llvm.compiler.used unless they are also
299 bool isUsedFunction(const Function *F) {
300 return UsedFunctions.count(F);
303 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
305 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
306 ArrayRef<const GlobalVariable *> TyInfo);
308 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
310 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
311 ArrayRef<const GlobalVariable *> TyInfo);
313 /// addCleanup - Add a cleanup action for a landing pad.
315 void addCleanup(MachineBasicBlock *LandingPad);
317 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
319 unsigned getTypeIDFor(const GlobalVariable *TI);
321 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
323 int getFilterIDFor(std::vector<unsigned> &TyIds);
325 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
327 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = 0);
329 /// getLandingPads - Return a reference to the landing pad info for the
330 /// current function.
331 const std::vector<LandingPadInfo> &getLandingPads() const {
335 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call
337 void setCallSiteLandingPad(MCSymbol *Sym, ArrayRef<unsigned> Sites);
339 /// getCallSiteLandingPad - Get the call site indexes for a landing pad EH
341 SmallVectorImpl<unsigned> &getCallSiteLandingPad(MCSymbol *Sym) {
342 assert(hasCallSiteLandingPad(Sym) &&
343 "missing call site number for landing pad!");
344 return LPadToCallSiteMap[Sym];
347 /// hasCallSiteLandingPad - Return true if the landing pad Eh symbol has an
348 /// associated call site.
349 bool hasCallSiteLandingPad(MCSymbol *Sym) {
350 return !LPadToCallSiteMap[Sym].empty();
353 /// setCallSiteBeginLabel - Map the begin label for a call site.
354 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
355 CallSiteMap[BeginLabel] = Site;
358 /// getCallSiteBeginLabel - Get the call site number for a begin label.
359 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
360 assert(hasCallSiteBeginLabel(BeginLabel) &&
361 "Missing call site number for EH_LABEL!");
362 return CallSiteMap[BeginLabel];
365 /// hasCallSiteBeginLabel - Return true if the begin label has a call site
366 /// number associated with it.
367 bool hasCallSiteBeginLabel(MCSymbol *BeginLabel) {
368 return CallSiteMap[BeginLabel] != 0;
371 /// setCurrentCallSite - Set the call site currently being processed.
372 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
374 /// getCurrentCallSite - Get the call site currently being processed, if any.
375 /// return zero if none.
376 unsigned getCurrentCallSite() { return CurCallSite; }
378 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
380 const std::vector<const GlobalVariable *> &getTypeInfos() const {
384 /// getFilterIds - Return a reference to the typeids encoding filters used in
385 /// the current function.
386 const std::vector<unsigned> &getFilterIds() const {
390 /// getPersonality - Return a personality function if available. The presence
391 /// of one is required to emit exception handling info.
392 const Function *getPersonality() const;
394 /// setVariableDbgInfo - Collect information used to emit debugging
395 /// information of a variable.
396 void setVariableDbgInfo(MDNode *N, unsigned Slot, DebugLoc Loc) {
397 VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Loc)));
400 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfo; }
402 }; // End class MachineModuleInfo
404 } // End llvm namespace