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/Support/Dwarf.h"
35 #include "llvm/Support/DataTypes.h"
36 #include "llvm/ADT/SmallVector.h"
37 #include "llvm/ADT/DenseMap.h"
38 #include "llvm/ADT/UniqueVector.h"
39 #include "llvm/ADT/SmallPtrSet.h"
40 #include "llvm/ADT/SmallSet.h"
41 #include "llvm/ADT/StringMap.h"
42 #include "llvm/CodeGen/MachineLocation.h"
43 #include "llvm/GlobalValue.h"
44 #include "llvm/Pass.h"
48 //===----------------------------------------------------------------------===//
49 // Forward declarations.
52 class MachineBasicBlock;
53 class MachineFunction;
59 /// MachineModuleInfoImpl - This class can be derived from and used by targets
60 /// to hold private target-specific information for each Module. Objects of
61 /// type are accessed/created with MMI::getInfo and destroyed when the
62 /// MachineModuleInfo is destroyed.
63 struct MachineModuleInfoImpl {
64 virtual ~MachineModuleInfoImpl();
69 //===----------------------------------------------------------------------===//
70 /// LandingPadInfo - This structure is used to retain landing pad info for
71 /// the current function.
73 struct LandingPadInfo {
74 MachineBasicBlock *LandingPadBlock; // Landing pad block.
75 SmallVector<unsigned, 1> BeginLabels; // Labels prior to invoke.
76 SmallVector<unsigned, 1> EndLabels; // Labels after invoke.
77 unsigned LandingPadLabel; // Label at beginning of landing pad.
78 Function *Personality; // Personality function.
79 std::vector<int> TypeIds; // List of type ids (filters negative)
81 explicit LandingPadInfo(MachineBasicBlock *MBB)
82 : LandingPadBlock(MBB)
88 //===----------------------------------------------------------------------===//
89 /// MachineModuleInfo - This class contains meta information specific to a
90 /// module. Queries can be made by different debugging and exception handling
91 /// schemes and reformated for specific use.
93 class MachineModuleInfo : public ImmutablePass {
94 /// ObjFileMMI - This is the object-file-format-specific implementation of
95 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
97 MachineModuleInfoImpl *ObjFileMMI;
99 // LabelIDList - One entry per assigned label. Normally the entry is equal to
100 // the list index(+1). If the entry is zero then the label has been deleted.
101 // Any other value indicates the label has been deleted by is mapped to
103 std::vector<unsigned> LabelIDList;
105 // FrameMoves - List of moves done by a function's prolog. Used to construct
106 // frame maps by debug and exception handling consumers.
107 std::vector<MachineMove> FrameMoves;
109 // LandingPads - List of LandingPadInfo describing the landing pad information
110 // in the current function.
111 std::vector<LandingPadInfo> LandingPads;
113 // TypeInfos - List of C++ TypeInfo used in the current function.
115 std::vector<GlobalVariable *> TypeInfos;
117 // FilterIds - List of typeids encoding filters used in the current function.
119 std::vector<unsigned> FilterIds;
121 // FilterEnds - List of the indices in FilterIds corresponding to filter
124 std::vector<unsigned> FilterEnds;
126 // Personalities - Vector of all personality functions ever seen. Used to emit
128 std::vector<Function *> Personalities;
130 /// UsedFunctions - The functions in the @llvm.used list in a more easily
131 /// searchable format. This does not include the functions in
132 /// llvm.compiler.used.
133 SmallPtrSet<const Function *, 32> UsedFunctions;
135 /// UsedDbgLabels - labels are used by debug info entries.
136 SmallSet<unsigned, 8> UsedDbgLabels;
139 bool CallsUnwindInit;
141 /// DbgInfoAvailable - True if debugging information is available
143 bool DbgInfoAvailable;
145 static char ID; // Pass identification, replacement for typeid
148 ~MachineModuleInfo();
150 bool doInitialization();
151 bool doFinalization();
153 /// BeginFunction - Begin gathering function meta information.
155 void BeginFunction(MachineFunction *MF);
157 /// EndFunction - Discard function meta information.
161 /// getInfo - Keep track of various per-function pieces of information for
162 /// backends that would like to do so.
164 template<typename Ty>
165 Ty *getObjFileInfo() {
167 ObjFileMMI = new Ty(*this);
169 assert((void*)dynamic_cast<Ty*>(ObjFileMMI) == (void*)ObjFileMMI &&
170 "Invalid concrete type or multiple inheritence for getInfo");
171 return static_cast<Ty*>(ObjFileMMI);
174 template<typename Ty>
175 const Ty *getObjFileInfo() const {
176 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
179 /// AnalyzeModule - Scan the module for global debug information.
181 void AnalyzeModule(Module &M);
183 /// hasDebugInfo - Returns true if valid debug info is present.
185 bool hasDebugInfo() const { return DbgInfoAvailable; }
186 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = true; }
188 bool callsEHReturn() const { return CallsEHReturn; }
189 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
191 bool callsUnwindInit() const { return CallsUnwindInit; }
192 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
194 /// NextLabelID - Return the next unique label id.
196 unsigned NextLabelID() {
197 unsigned ID = (unsigned)LabelIDList.size() + 1;
198 LabelIDList.push_back(ID);
202 /// InvalidateLabel - Inhibit use of the specified label # from
203 /// MachineModuleInfo, for example because the code was deleted.
204 void InvalidateLabel(unsigned LabelID) {
205 // Remap to zero to indicate deletion.
206 RemapLabel(LabelID, 0);
209 /// RemapLabel - Indicate that a label has been merged into another.
211 void RemapLabel(unsigned OldLabelID, unsigned NewLabelID) {
212 assert(0 < OldLabelID && OldLabelID <= LabelIDList.size() &&
213 "Old label ID out of range.");
214 assert(NewLabelID <= LabelIDList.size() &&
215 "New label ID out of range.");
216 LabelIDList[OldLabelID - 1] = NewLabelID;
219 /// MappedLabel - Find out the label's final ID. Zero indicates deletion.
220 /// ID != Mapped ID indicates that the label was folded into another label.
221 unsigned MappedLabel(unsigned LabelID) const {
222 assert(LabelID <= LabelIDList.size() && "Debug label ID out of range.");
223 return LabelID ? LabelIDList[LabelID - 1] : 0;
226 /// isDbgLabelUsed - Return true if label with LabelID is used by
228 bool isDbgLabelUsed(unsigned LabelID) {
229 return UsedDbgLabels.count(LabelID);
232 /// RecordUsedDbgLabel - Mark label with LabelID as used. This is used
233 /// by DwarfWriter to inform DebugLabelFolder that certain labels are
234 /// not to be deleted.
235 void RecordUsedDbgLabel(unsigned LabelID) {
236 UsedDbgLabels.insert(LabelID);
239 /// getFrameMoves - Returns a reference to a list of moves done in the current
240 /// function's prologue. Used to construct frame maps for debug and exception
241 /// handling comsumers.
242 std::vector<MachineMove> &getFrameMoves() { return FrameMoves; }
244 //===-EH-----------------------------------------------------------------===//
246 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
247 /// specified MachineBasicBlock.
248 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
250 /// addInvoke - Provide the begin and end labels of an invoke style call and
251 /// associate it with a try landing pad block.
252 void addInvoke(MachineBasicBlock *LandingPad, unsigned BeginLabel,
255 /// addLandingPad - Add a new panding pad. Returns the label ID for the
256 /// landing pad entry.
257 unsigned addLandingPad(MachineBasicBlock *LandingPad);
259 /// addPersonality - Provide the personality function for the exception
261 void addPersonality(MachineBasicBlock *LandingPad, Function *Personality);
263 /// getPersonalityIndex - Get index of the current personality function inside
264 /// Personalitites array
265 unsigned getPersonalityIndex() const;
267 /// getPersonalities - Return array of personality functions ever seen.
268 const std::vector<Function *>& getPersonalities() const {
269 return Personalities;
272 /// isUsedFunction - Return true if the functions in the llvm.used list. This
273 /// does not return true for things in llvm.compiler.used unless they are also
275 bool isUsedFunction(const Function *F) {
276 return UsedFunctions.count(F);
279 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
281 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
282 std::vector<GlobalVariable *> &TyInfo);
284 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
286 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
287 std::vector<GlobalVariable *> &TyInfo);
289 /// addCleanup - Add a cleanup action for a landing pad.
291 void addCleanup(MachineBasicBlock *LandingPad);
293 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
295 unsigned getTypeIDFor(GlobalVariable *TI);
297 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
299 int getFilterIDFor(std::vector<unsigned> &TyIds);
301 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
303 void TidyLandingPads();
305 /// getLandingPads - Return a reference to the landing pad info for the
306 /// current function.
307 const std::vector<LandingPadInfo> &getLandingPads() const {
311 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
313 const std::vector<GlobalVariable *> &getTypeInfos() const {
317 /// getFilterIds - Return a reference to the typeids encoding filters used in
318 /// the current function.
319 const std::vector<unsigned> &getFilterIds() const {
323 /// getPersonality - Return a personality function if available. The presence
324 /// of one is required to emit exception handling info.
325 Function *getPersonality() const;
327 }; // End class MachineModuleInfo
329 } // End llvm namespace