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/CodeGen/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/System/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 MachineBasicBlock;
56 class MachineFunction;
61 /// MachineModuleInfoImpl - This class can be derived from and used by targets
62 /// to hold private target-specific information for each Module. Objects of
63 /// type are accessed/created with MMI::getInfo and destroyed when the
64 /// MachineModuleInfo is destroyed.
65 class MachineModuleInfoImpl {
67 typedef PointerIntPair<MCSymbol*, 1, bool> StubValueTy;
68 virtual ~MachineModuleInfoImpl();
69 typedef std::vector<std::pair<MCSymbol*, StubValueTy> > SymbolListTy;
71 static SymbolListTy GetSortedStubs(const DenseMap<MCSymbol*, StubValueTy>&);
76 //===----------------------------------------------------------------------===//
77 /// LandingPadInfo - This structure is used to retain landing pad info for
78 /// the current function.
80 struct LandingPadInfo {
81 MachineBasicBlock *LandingPadBlock; // Landing pad block.
82 SmallVector<MCSymbol*, 1> BeginLabels; // Labels prior to invoke.
83 SmallVector<MCSymbol*, 1> EndLabels; // Labels after invoke.
84 MCSymbol *LandingPadLabel; // Label at beginning of landing pad.
85 const Function *Personality; // Personality function.
86 std::vector<int> TypeIds; // List of type ids (filters negative)
88 explicit LandingPadInfo(MachineBasicBlock *MBB)
89 : LandingPadBlock(MBB), LandingPadLabel(0), Personality(0) {}
92 class MMIAddrLabelMap;
94 //===----------------------------------------------------------------------===//
95 /// MachineModuleInfo - This class contains meta information specific to a
96 /// module. Queries can be made by different debugging and exception handling
97 /// schemes and reformated for specific use.
99 class MachineModuleInfo : public ImmutablePass {
100 /// Context - This is the MCContext used for the entire code generator.
103 /// TheModule - This is the LLVM Module being worked on.
104 const Module *TheModule;
106 /// ObjFileMMI - This is the object-file-format-specific implementation of
107 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
109 MachineModuleInfoImpl *ObjFileMMI;
111 // FrameMoves - List of moves done by a function's prolog. Used to construct
112 // frame maps by debug and exception handling consumers.
113 std::vector<MachineMove> FrameMoves;
115 // LandingPads - List of LandingPadInfo describing the landing pad information
116 // in the current function.
117 std::vector<LandingPadInfo> LandingPads;
119 // Map of invoke call site index values to associated begin EH_LABEL for
120 // the current function.
121 DenseMap<MCSymbol*, unsigned> CallSiteMap;
123 // The current call site index being processed, if any. 0 if none.
124 unsigned CurCallSite;
126 // TypeInfos - List of C++ TypeInfo used in the current function.
128 std::vector<const GlobalVariable *> TypeInfos;
130 // FilterIds - List of typeids encoding filters used in the current function.
132 std::vector<unsigned> FilterIds;
134 // FilterEnds - List of the indices in FilterIds corresponding to filter
137 std::vector<unsigned> FilterEnds;
139 // Personalities - Vector of all personality functions ever seen. Used to emit
141 std::vector<const Function *> Personalities;
143 /// UsedFunctions - The functions in the @llvm.used list in a more easily
144 /// searchable format. This does not include the functions in
145 /// llvm.compiler.used.
146 SmallPtrSet<const Function *, 32> UsedFunctions;
149 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
150 /// the specified basic block's address of label.
151 MMIAddrLabelMap *AddrLabelSymbols;
154 bool CallsUnwindInit;
156 /// DbgInfoAvailable - True if debugging information is available
158 bool DbgInfoAvailable;
160 /// True if this module calls VarArg function with floating point arguments.
161 /// This is used to emit an undefined reference to fltused on Windows targets.
162 bool CallsExternalVAFunctionWithFloatingPointArguments;
165 static char ID; // Pass identification, replacement for typeid
167 typedef std::pair<unsigned, DebugLoc> UnsignedDebugLocPair;
168 typedef SmallVector<std::pair<TrackingVH<MDNode>, UnsignedDebugLocPair>, 4>
169 VariableDbgInfoMapTy;
170 VariableDbgInfoMapTy VariableDbgInfo;
172 MachineModuleInfo(); // DUMMY CONSTRUCTOR, DO NOT CALL.
173 MachineModuleInfo(const MCAsmInfo &MAI); // Real constructor.
174 ~MachineModuleInfo();
176 bool doInitialization();
177 bool doFinalization();
179 /// EndFunction - Discard function meta information.
183 const MCContext &getContext() const { return Context; }
184 MCContext &getContext() { return Context; }
186 void setModule(const Module *M) { TheModule = M; }
187 const Module *getModule() const { return TheModule; }
189 /// getInfo - Keep track of various per-function pieces of information for
190 /// backends that would like to do so.
192 template<typename Ty>
193 Ty &getObjFileInfo() {
195 ObjFileMMI = new Ty(*this);
196 return *static_cast<Ty*>(ObjFileMMI);
199 template<typename Ty>
200 const Ty &getObjFileInfo() const {
201 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
204 /// AnalyzeModule - Scan the module for global debug information.
206 void AnalyzeModule(const Module &M);
208 /// hasDebugInfo - Returns true if valid debug info is present.
210 bool hasDebugInfo() const { return DbgInfoAvailable; }
211 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = true; }
213 bool callsEHReturn() const { return CallsEHReturn; }
214 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
216 bool callsUnwindInit() const { return CallsUnwindInit; }
217 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
219 bool callsExternalVAFunctionWithFloatingPointArguments() const {
220 return CallsExternalVAFunctionWithFloatingPointArguments;
223 void setCallsExternalVAFunctionWithFloatingPointArguments(bool b) {
224 CallsExternalVAFunctionWithFloatingPointArguments = b;
227 /// getFrameMoves - Returns a reference to a list of moves done in the current
228 /// function's prologue. Used to construct frame maps for debug and exception
229 /// handling comsumers.
230 std::vector<MachineMove> &getFrameMoves() { return FrameMoves; }
232 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
233 /// block when its address is taken. This cannot be its normal LBB label
234 /// because the block may be accessed outside its containing function.
235 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB);
237 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
238 /// basic block when its address is taken. If other blocks were RAUW'd to
239 /// this one, we may have to emit them as well, return the whole set.
240 std::vector<MCSymbol*> getAddrLabelSymbolToEmit(const BasicBlock *BB);
242 /// takeDeletedSymbolsForFunction - If the specified function has had any
243 /// references to address-taken blocks generated, but the block got deleted,
244 /// return the symbol now so we can emit it. This prevents emitting a
245 /// reference to a symbol that has no definition.
246 void takeDeletedSymbolsForFunction(const Function *F,
247 std::vector<MCSymbol*> &Result);
250 //===- EH ---------------------------------------------------------------===//
252 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
253 /// specified MachineBasicBlock.
254 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
256 /// addInvoke - Provide the begin and end labels of an invoke style call and
257 /// associate it with a try landing pad block.
258 void addInvoke(MachineBasicBlock *LandingPad,
259 MCSymbol *BeginLabel, MCSymbol *EndLabel);
261 /// addLandingPad - Add a new panding pad. Returns the label ID for the
262 /// landing pad entry.
263 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
265 /// addPersonality - Provide the personality function for the exception
267 void addPersonality(MachineBasicBlock *LandingPad,
268 const Function *Personality);
270 /// getPersonalityIndex - Get index of the current personality function inside
271 /// Personalitites array
272 unsigned getPersonalityIndex() const;
274 /// getPersonalities - Return array of personality functions ever seen.
275 const std::vector<const Function *>& getPersonalities() const {
276 return Personalities;
279 /// isUsedFunction - Return true if the functions in the llvm.used list. This
280 /// does not return true for things in llvm.compiler.used unless they are also
282 bool isUsedFunction(const Function *F) {
283 return UsedFunctions.count(F);
286 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
288 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
289 std::vector<const GlobalVariable *> &TyInfo);
291 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
293 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
294 std::vector<const GlobalVariable *> &TyInfo);
296 /// addCleanup - Add a cleanup action for a landing pad.
298 void addCleanup(MachineBasicBlock *LandingPad);
300 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
302 unsigned getTypeIDFor(const GlobalVariable *TI);
304 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
306 int getFilterIDFor(std::vector<unsigned> &TyIds);
308 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
310 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = 0);
312 /// getLandingPads - Return a reference to the landing pad info for the
313 /// current function.
314 const std::vector<LandingPadInfo> &getLandingPads() const {
318 /// setCallSiteBeginLabel - Map the begin label for a call site
319 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
320 CallSiteMap[BeginLabel] = Site;
323 /// getCallSiteBeginLabel - Get the call site number for a begin label
324 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
325 assert(CallSiteMap.count(BeginLabel) &&
326 "Missing call site number for EH_LABEL!");
327 return CallSiteMap[BeginLabel];
330 /// setCurrentCallSite - Set the call site currently being processed.
331 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
333 /// getCurrentCallSite - Get the call site currently being processed, if any.
334 /// return zero if none.
335 unsigned getCurrentCallSite(void) { return CurCallSite; }
337 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
339 const std::vector<const GlobalVariable *> &getTypeInfos() const {
343 /// getFilterIds - Return a reference to the typeids encoding filters used in
344 /// the current function.
345 const std::vector<unsigned> &getFilterIds() const {
349 /// getPersonality - Return a personality function if available. The presence
350 /// of one is required to emit exception handling info.
351 const Function *getPersonality() const;
353 /// setVariableDbgInfo - Collect information used to emit debugging
354 /// information of a variable.
355 void setVariableDbgInfo(MDNode *N, unsigned Slot, DebugLoc Loc) {
356 VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Loc)));
359 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfo; }
361 }; // End class MachineModuleInfo
363 } // End llvm namespace