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/Pass.h"
35 #include "llvm/GlobalValue.h"
36 #include "llvm/Metadata.h"
37 #include "llvm/MC/MachineLocation.h"
38 #include "llvm/MC/MCContext.h"
39 #include "llvm/Support/Dwarf.h"
40 #include "llvm/Support/DebugLoc.h"
41 #include "llvm/Support/ValueHandle.h"
42 #include "llvm/Support/DataTypes.h"
43 #include "llvm/ADT/DenseMap.h"
44 #include "llvm/ADT/PointerIntPair.h"
45 #include "llvm/ADT/SmallPtrSet.h"
46 #include "llvm/ADT/SmallVector.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 information
119 // in the current function.
120 std::vector<LandingPadInfo> LandingPads;
122 // Map of invoke call site index values to associated begin EH_LABEL for
123 // the current function.
124 DenseMap<MCSymbol*, unsigned> CallSiteMap;
126 // The current call site index being processed, if any. 0 if none.
127 unsigned CurCallSite;
129 // TypeInfos - List of C++ TypeInfo used in the current function.
131 std::vector<const GlobalVariable *> TypeInfos;
133 // FilterIds - List of typeids encoding filters used in the current function.
135 std::vector<unsigned> FilterIds;
137 // FilterEnds - List of the indices in FilterIds corresponding to filter
140 std::vector<unsigned> FilterEnds;
142 // Personalities - Vector of all personality functions ever seen. Used to emit
144 std::vector<const Function *> Personalities;
146 /// UsedFunctions - The functions in the @llvm.used list in a more easily
147 /// searchable format. This does not include the functions in
148 /// llvm.compiler.used.
149 SmallPtrSet<const Function *, 32> UsedFunctions;
152 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
153 /// the specified basic block's address of label.
154 MMIAddrLabelMap *AddrLabelSymbols;
157 bool CallsUnwindInit;
159 /// DbgInfoAvailable - True if debugging information is available
161 bool DbgInfoAvailable;
163 /// True if this module calls VarArg function with floating point arguments.
164 /// This is used to emit an undefined reference to fltused on Windows targets.
165 bool CallsExternalVAFunctionWithFloatingPointArguments;
168 static char ID; // Pass identification, replacement for typeid
170 typedef std::pair<unsigned, DebugLoc> UnsignedDebugLocPair;
171 typedef SmallVector<std::pair<TrackingVH<MDNode>, UnsignedDebugLocPair>, 4>
172 VariableDbgInfoMapTy;
173 VariableDbgInfoMapTy VariableDbgInfo;
175 MachineModuleInfo(); // DUMMY CONSTRUCTOR, DO NOT CALL.
177 MachineModuleInfo(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
178 const MCObjectFileInfo *MOFI);
179 ~MachineModuleInfo();
181 bool doInitialization();
182 bool doFinalization();
184 /// EndFunction - Discard function meta information.
188 const MCContext &getContext() const { return Context; }
189 MCContext &getContext() { return Context; }
191 void setModule(const Module *M) { TheModule = M; }
192 const Module *getModule() const { return TheModule; }
194 /// getInfo - Keep track of various per-function pieces of information for
195 /// backends that would like to do so.
197 template<typename Ty>
198 Ty &getObjFileInfo() {
200 ObjFileMMI = new Ty(*this);
201 return *static_cast<Ty*>(ObjFileMMI);
204 template<typename Ty>
205 const Ty &getObjFileInfo() const {
206 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
209 /// AnalyzeModule - Scan the module for global debug information.
211 void AnalyzeModule(const Module &M);
213 /// hasDebugInfo - Returns true if valid debug info is present.
215 bool hasDebugInfo() const { return DbgInfoAvailable; }
216 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
218 bool callsEHReturn() const { return CallsEHReturn; }
219 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
221 bool callsUnwindInit() const { return CallsUnwindInit; }
222 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
224 bool callsExternalVAFunctionWithFloatingPointArguments() const {
225 return CallsExternalVAFunctionWithFloatingPointArguments;
228 void setCallsExternalVAFunctionWithFloatingPointArguments(bool b) {
229 CallsExternalVAFunctionWithFloatingPointArguments = b;
232 /// getFrameMoves - Returns a reference to a list of moves done in the current
233 /// function's prologue. Used to construct frame maps for debug and exception
234 /// handling comsumers.
235 std::vector<MachineMove> &getFrameMoves() { return FrameMoves; }
237 /// getCompactUnwindEncoding - Returns the compact unwind encoding for a
238 /// function if the target supports the encoding. This encoding replaces a
239 /// function's CIE and FDE.
240 uint32_t getCompactUnwindEncoding() const { return CompactUnwindEncoding; }
242 /// setCompactUnwindEncoding - Set the compact unwind encoding for a function
243 /// if the target supports the encoding.
244 void setCompactUnwindEncoding(uint32_t Enc) { CompactUnwindEncoding = Enc; }
246 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
247 /// block when its address is taken. This cannot be its normal LBB label
248 /// because the block may be accessed outside its containing function.
249 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB);
251 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
252 /// basic block when its address is taken. If other blocks were RAUW'd to
253 /// this one, we may have to emit them as well, return the whole set.
254 std::vector<MCSymbol*> getAddrLabelSymbolToEmit(const BasicBlock *BB);
256 /// takeDeletedSymbolsForFunction - If the specified function has had any
257 /// references to address-taken blocks generated, but the block got deleted,
258 /// return the symbol now so we can emit it. This prevents emitting a
259 /// reference to a symbol that has no definition.
260 void takeDeletedSymbolsForFunction(const Function *F,
261 std::vector<MCSymbol*> &Result);
264 //===- EH ---------------------------------------------------------------===//
266 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
267 /// specified MachineBasicBlock.
268 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
270 /// addInvoke - Provide the begin and end labels of an invoke style call and
271 /// associate it with a try landing pad block.
272 void addInvoke(MachineBasicBlock *LandingPad,
273 MCSymbol *BeginLabel, MCSymbol *EndLabel);
275 /// addLandingPad - Add a new panding pad. Returns the label ID for the
276 /// landing pad entry.
277 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
279 /// addPersonality - Provide the personality function for the exception
281 void addPersonality(MachineBasicBlock *LandingPad,
282 const Function *Personality);
284 /// getPersonalityIndex - Get index of the current personality function inside
285 /// Personalitites array
286 unsigned getPersonalityIndex() const;
288 /// getPersonalities - Return array of personality functions ever seen.
289 const std::vector<const Function *>& getPersonalities() const {
290 return Personalities;
293 /// isUsedFunction - Return true if the functions in the llvm.used list. This
294 /// does not return true for things in llvm.compiler.used unless they are also
296 bool isUsedFunction(const Function *F) {
297 return UsedFunctions.count(F);
300 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
302 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
303 ArrayRef<const GlobalVariable *> TyInfo);
305 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
307 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
308 ArrayRef<const GlobalVariable *> TyInfo);
310 /// addCleanup - Add a cleanup action for a landing pad.
312 void addCleanup(MachineBasicBlock *LandingPad);
314 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
316 unsigned getTypeIDFor(const GlobalVariable *TI);
318 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
320 int getFilterIDFor(std::vector<unsigned> &TyIds);
322 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
324 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = 0);
326 /// getLandingPads - Return a reference to the landing pad info for the
327 /// current function.
328 const std::vector<LandingPadInfo> &getLandingPads() const {
332 /// setCallSiteBeginLabel - Map the begin label for a call site
333 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
334 CallSiteMap[BeginLabel] = Site;
337 /// getCallSiteBeginLabel - Get the call site number for a begin label
338 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
339 assert(CallSiteMap.count(BeginLabel) &&
340 "Missing call site number for EH_LABEL!");
341 return CallSiteMap[BeginLabel];
344 /// setCurrentCallSite - Set the call site currently being processed.
345 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
347 /// getCurrentCallSite - Get the call site currently being processed, if any.
348 /// return zero if none.
349 unsigned getCurrentCallSite(void) { return CurCallSite; }
351 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
353 const std::vector<const GlobalVariable *> &getTypeInfos() const {
357 /// getFilterIds - Return a reference to the typeids encoding filters used in
358 /// the current function.
359 const std::vector<unsigned> &getFilterIds() const {
363 /// getPersonality - Return a personality function if available. The presence
364 /// of one is required to emit exception handling info.
365 const Function *getPersonality() const;
367 /// setVariableDbgInfo - Collect information used to emit debugging
368 /// information of a variable.
369 void setVariableDbgInfo(MDNode *N, unsigned Slot, DebugLoc Loc) {
370 VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Loc)));
373 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfo; }
375 }; // End class MachineModuleInfo
377 } // End llvm namespace