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/Metadata.h"
41 #include "llvm/IR/ValueHandle.h"
42 #include "llvm/MC/MCContext.h"
43 #include "llvm/MC/MachineLocation.h"
44 #include "llvm/Pass.h"
45 #include "llvm/Support/DataTypes.h"
46 #include "llvm/Support/Dwarf.h"
50 //===----------------------------------------------------------------------===//
51 // Forward declarations.
56 class MMIAddrLabelMap;
57 class MachineBasicBlock;
58 class MachineFunction;
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 /// Context - This is the MCContext used for the entire code generator.
114 /// TheModule - This is the LLVM Module being worked on.
115 const Module *TheModule;
117 /// ObjFileMMI - This is the object-file-format-specific implementation of
118 /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
120 MachineModuleInfoImpl *ObjFileMMI;
122 /// List of moves done by a function's prolog. Used to construct frame maps
123 /// by debug and exception handling consumers.
124 std::vector<MCCFIInstruction> FrameInstructions;
126 /// LandingPads - List of LandingPadInfo describing the landing pad
127 /// information in the current function.
128 std::vector<LandingPadInfo> LandingPads;
130 /// LPadToCallSiteMap - Map a landing pad's EH symbol to the call site
132 DenseMap<MCSymbol*, SmallVector<unsigned, 4> > LPadToCallSiteMap;
134 /// CallSiteMap - Map of invoke call site index values to associated begin
135 /// EH_LABEL for the current function.
136 DenseMap<MCSymbol*, unsigned> CallSiteMap;
138 /// CurCallSite - The current call site index being processed, if any. 0 if
140 unsigned CurCallSite;
142 /// TypeInfos - List of C++ TypeInfo used in the current function.
143 std::vector<const GlobalValue *> TypeInfos;
145 /// FilterIds - List of typeids encoding filters used in the current function.
146 std::vector<unsigned> FilterIds;
148 /// FilterEnds - List of the indices in FilterIds corresponding to filter
150 std::vector<unsigned> FilterEnds;
152 /// Personalities - Vector of all personality functions ever seen. Used to
153 /// emit common EH frames.
154 std::vector<const Function *> Personalities;
156 /// AddrLabelSymbols - This map keeps track of which symbol is being used for
157 /// the specified basic block's address of label.
158 MMIAddrLabelMap *AddrLabelSymbols;
161 bool CallsUnwindInit;
164 // TODO: Ideally, what we'd like is to have a switch that allows emitting
165 // synchronous (precise at call-sites only) CFA into .eh_frame. However,
166 // even under this switch, we'd like .debug_frame to be precise when using.
167 // -g. At this moment, there's no way to specify that some CFI directives
168 // go into .eh_frame only, while others go into .debug_frame only.
170 /// DbgInfoAvailable - True if debugging information is available
172 bool DbgInfoAvailable;
174 /// UsesVAFloatArgument - True if this module calls VarArg function with
175 /// floating-point arguments. This is used to emit an undefined reference
176 /// to _fltused on Windows targets.
177 bool UsesVAFloatArgument;
179 /// UsesMorestackAddr - True if the module calls the __morestack function
180 /// indirectly, as is required under the large code model on x86. This is used
181 /// to emit a definition of a symbol, __morestack_addr, containing the
182 /// address. See comments in lib/Target/X86/X86FrameLowering.cpp for more
184 bool UsesMorestackAddr;
186 EHPersonality PersonalityTypeCache;
189 static char ID; // Pass identification, replacement for typeid
191 struct VariableDbgInfo {
192 const DILocalVariable *Var;
193 const DIExpression *Expr;
195 const DILocation *Loc;
197 VariableDbgInfo(const DILocalVariable *Var, const DIExpression *Expr,
198 unsigned Slot, const DILocation *Loc)
199 : Var(Var), Expr(Expr), Slot(Slot), Loc(Loc) {}
201 typedef SmallVector<VariableDbgInfo, 4> VariableDbgInfoMapTy;
202 VariableDbgInfoMapTy VariableDbgInfos;
204 MachineModuleInfo(); // DUMMY CONSTRUCTOR, DO NOT CALL.
206 MachineModuleInfo(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
207 const MCObjectFileInfo *MOFI);
208 ~MachineModuleInfo() override;
210 // Initialization and Finalization
211 bool doInitialization(Module &) override;
212 bool doFinalization(Module &) override;
214 /// EndFunction - Discard function meta information.
218 const MCContext &getContext() const { return Context; }
219 MCContext &getContext() { return Context; }
221 void setModule(const Module *M) { TheModule = M; }
222 const Module *getModule() const { return TheModule; }
224 /// getInfo - Keep track of various per-function pieces of information for
225 /// backends that would like to do so.
227 template<typename Ty>
228 Ty &getObjFileInfo() {
229 if (ObjFileMMI == nullptr)
230 ObjFileMMI = new Ty(*this);
231 return *static_cast<Ty*>(ObjFileMMI);
234 template<typename Ty>
235 const Ty &getObjFileInfo() const {
236 return const_cast<MachineModuleInfo*>(this)->getObjFileInfo<Ty>();
239 /// hasDebugInfo - Returns true if valid debug info is present.
241 bool hasDebugInfo() const { return DbgInfoAvailable; }
242 void setDebugInfoAvailability(bool avail) { DbgInfoAvailable = avail; }
244 bool callsEHReturn() const { return CallsEHReturn; }
245 void setCallsEHReturn(bool b) { CallsEHReturn = b; }
247 bool callsUnwindInit() const { return CallsUnwindInit; }
248 void setCallsUnwindInit(bool b) { CallsUnwindInit = b; }
250 bool hasEHFunclets() const { return HasEHFunclets; }
251 void setHasEHFunclets(bool V) { HasEHFunclets = V; }
253 bool usesVAFloatArgument() const {
254 return UsesVAFloatArgument;
257 void setUsesVAFloatArgument(bool b) {
258 UsesVAFloatArgument = b;
261 bool usesMorestackAddr() const {
262 return UsesMorestackAddr;
265 void setUsesMorestackAddr(bool b) {
266 UsesMorestackAddr = b;
269 /// \brief Returns a reference to a list of cfi instructions in the current
270 /// function's prologue. Used to construct frame maps for debug and exception
271 /// handling comsumers.
272 const std::vector<MCCFIInstruction> &getFrameInstructions() const {
273 return FrameInstructions;
276 unsigned LLVM_ATTRIBUTE_UNUSED_RESULT
277 addFrameInst(const MCCFIInstruction &Inst) {
278 FrameInstructions.push_back(Inst);
279 return FrameInstructions.size() - 1;
282 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
283 /// block when its address is taken. This cannot be its normal LBB label
284 /// because the block may be accessed outside its containing function.
285 MCSymbol *getAddrLabelSymbol(const BasicBlock *BB) {
286 return getAddrLabelSymbolToEmit(BB).front();
289 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
290 /// basic block when its address is taken. If other blocks were RAUW'd to
291 /// this one, we may have to emit them as well, return the whole set.
292 ArrayRef<MCSymbol *> getAddrLabelSymbolToEmit(const BasicBlock *BB);
294 /// takeDeletedSymbolsForFunction - If the specified function has had any
295 /// references to address-taken blocks generated, but the block got deleted,
296 /// return the symbol now so we can emit it. This prevents emitting a
297 /// reference to a symbol that has no definition.
298 void takeDeletedSymbolsForFunction(const Function *F,
299 std::vector<MCSymbol*> &Result);
302 //===- EH ---------------------------------------------------------------===//
304 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
305 /// specified MachineBasicBlock.
306 LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
308 /// addInvoke - Provide the begin and end labels of an invoke style call and
309 /// associate it with a try landing pad block.
310 void addInvoke(MachineBasicBlock *LandingPad,
311 MCSymbol *BeginLabel, MCSymbol *EndLabel);
313 /// addLandingPad - Add a new panding pad. Returns the label ID for the
314 /// landing pad entry.
315 MCSymbol *addLandingPad(MachineBasicBlock *LandingPad);
317 /// addPersonality - Provide the personality function for the exception
319 void addPersonality(const Function *Personality);
321 /// getPersonalities - Return array of personality functions ever seen.
322 const std::vector<const Function *>& getPersonalities() const {
323 return Personalities;
326 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
328 void addCatchTypeInfo(MachineBasicBlock *LandingPad,
329 ArrayRef<const GlobalValue *> TyInfo);
331 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
333 void addFilterTypeInfo(MachineBasicBlock *LandingPad,
334 ArrayRef<const GlobalValue *> TyInfo);
336 /// addCleanup - Add a cleanup action for a landing pad.
338 void addCleanup(MachineBasicBlock *LandingPad);
340 void addSEHCatchHandler(MachineBasicBlock *LandingPad, const Function *Filter,
341 const BlockAddress *RecoverLabel);
343 void addSEHCleanupHandler(MachineBasicBlock *LandingPad,
344 const Function *Cleanup);
346 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
348 unsigned getTypeIDFor(const GlobalValue *TI);
350 /// getFilterIDFor - Return the id of the filter encoded by TyIds. This is
352 int getFilterIDFor(std::vector<unsigned> &TyIds);
354 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
356 void TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap = nullptr);
358 /// getLandingPads - Return a reference to the landing pad info for the
359 /// current function.
360 const std::vector<LandingPadInfo> &getLandingPads() const {
364 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call
366 void setCallSiteLandingPad(MCSymbol *Sym, ArrayRef<unsigned> Sites);
368 /// getCallSiteLandingPad - Get the call site indexes for a landing pad EH
370 SmallVectorImpl<unsigned> &getCallSiteLandingPad(MCSymbol *Sym) {
371 assert(hasCallSiteLandingPad(Sym) &&
372 "missing call site number for landing pad!");
373 return LPadToCallSiteMap[Sym];
376 /// hasCallSiteLandingPad - Return true if the landing pad Eh symbol has an
377 /// associated call site.
378 bool hasCallSiteLandingPad(MCSymbol *Sym) {
379 return !LPadToCallSiteMap[Sym].empty();
382 /// setCallSiteBeginLabel - Map the begin label for a call site.
383 void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
384 CallSiteMap[BeginLabel] = Site;
387 /// getCallSiteBeginLabel - Get the call site number for a begin label.
388 unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
389 assert(hasCallSiteBeginLabel(BeginLabel) &&
390 "Missing call site number for EH_LABEL!");
391 return CallSiteMap[BeginLabel];
394 /// hasCallSiteBeginLabel - Return true if the begin label has a call site
395 /// number associated with it.
396 bool hasCallSiteBeginLabel(MCSymbol *BeginLabel) {
397 return CallSiteMap[BeginLabel] != 0;
400 /// setCurrentCallSite - Set the call site currently being processed.
401 void setCurrentCallSite(unsigned Site) { CurCallSite = Site; }
403 /// getCurrentCallSite - Get the call site currently being processed, if any.
404 /// return zero if none.
405 unsigned getCurrentCallSite() { return CurCallSite; }
407 /// getTypeInfos - Return a reference to the C++ typeinfo for the current
409 const std::vector<const GlobalValue *> &getTypeInfos() const {
413 /// getFilterIds - Return a reference to the typeids encoding filters used in
414 /// the current function.
415 const std::vector<unsigned> &getFilterIds() const {
419 /// setVariableDbgInfo - Collect information used to emit debugging
420 /// information of a variable.
421 void setVariableDbgInfo(const DILocalVariable *Var, const DIExpression *Expr,
422 unsigned Slot, const DILocation *Loc) {
423 VariableDbgInfos.emplace_back(Var, Expr, Slot, Loc);
426 VariableDbgInfoMapTy &getVariableDbgInfo() { return VariableDbgInfos; }
428 }; // End class MachineModuleInfo
430 } // End llvm namespace