1 //===- llvm/Module.h - C++ class to represent a VM module -------*- 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 //===----------------------------------------------------------------------===//
11 /// Module.h This file contains the declarations for the Module class.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_IR_MODULE_H
16 #define LLVM_IR_MODULE_H
18 #include "llvm-c/Types.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/StringMap.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/ADT/iterator_range.h"
23 #include "llvm/IR/Attributes.h"
24 #include "llvm/IR/Comdat.h"
25 #include "llvm/IR/DataLayout.h"
26 #include "llvm/IR/Function.h"
27 #include "llvm/IR/GlobalAlias.h"
28 #include "llvm/IR/GlobalIFunc.h"
29 #include "llvm/IR/GlobalVariable.h"
30 #include "llvm/IR/Metadata.h"
31 #include "llvm/IR/SymbolTableListTraits.h"
32 #include "llvm/Support/CBindingWrapping.h"
33 #include "llvm/Support/CodeGen.h"
48 class RandomNumberGenerator;
49 template <class PtrType> class SmallPtrSetImpl;
52 /// A Module instance is used to store all the information related to an
53 /// LLVM module. Modules are the top level container of all other LLVM
54 /// Intermediate Representation (IR) objects. Each module directly contains a
55 /// list of globals variables, a list of functions, a list of libraries (or
56 /// other modules) this module depends on, a symbol table, and various data
57 /// about the target's characteristics.
59 /// A module maintains a GlobalValRefMap object that is used to hold all
60 /// constant references to global variables in the module. When a global
61 /// variable is destroyed, it should have no entries in the GlobalValueRefMap.
62 /// The main container class for the LLVM Intermediate Representation.
64 /// @name Types And Enumerations
67 /// The type for the list of global variables.
68 using GlobalListType = SymbolTableList<GlobalVariable>;
69 /// The type for the list of functions.
70 using FunctionListType = SymbolTableList<Function>;
71 /// The type for the list of aliases.
72 using AliasListType = SymbolTableList<GlobalAlias>;
73 /// The type for the list of ifuncs.
74 using IFuncListType = SymbolTableList<GlobalIFunc>;
75 /// The type for the list of named metadata.
76 using NamedMDListType = ilist<NamedMDNode>;
77 /// The type of the comdat "symbol" table.
78 using ComdatSymTabType = StringMap<Comdat>;
80 /// The Global Variable iterator.
81 using global_iterator = GlobalListType::iterator;
82 /// The Global Variable constant iterator.
83 using const_global_iterator = GlobalListType::const_iterator;
85 /// The Function iterators.
86 using iterator = FunctionListType::iterator;
87 /// The Function constant iterator
88 using const_iterator = FunctionListType::const_iterator;
90 /// The Function reverse iterator.
91 using reverse_iterator = FunctionListType::reverse_iterator;
92 /// The Function constant reverse iterator.
93 using const_reverse_iterator = FunctionListType::const_reverse_iterator;
95 /// The Global Alias iterators.
96 using alias_iterator = AliasListType::iterator;
97 /// The Global Alias constant iterator
98 using const_alias_iterator = AliasListType::const_iterator;
100 /// The Global IFunc iterators.
101 using ifunc_iterator = IFuncListType::iterator;
102 /// The Global IFunc constant iterator
103 using const_ifunc_iterator = IFuncListType::const_iterator;
105 /// The named metadata iterators.
106 using named_metadata_iterator = NamedMDListType::iterator;
107 /// The named metadata constant iterators.
108 using const_named_metadata_iterator = NamedMDListType::const_iterator;
110 /// This enumeration defines the supported behaviors of module flags.
111 enum ModFlagBehavior {
112 /// Emits an error if two values disagree, otherwise the resulting value is
113 /// that of the operands.
116 /// Emits a warning if two values disagree. The result value will be the
117 /// operand for the flag from the first module being linked.
120 /// Adds a requirement that another module flag be present and have a
121 /// specified value after linking is performed. The value must be a metadata
122 /// pair, where the first element of the pair is the ID of the module flag
123 /// to be restricted, and the second element of the pair is the value the
124 /// module flag should be restricted to. This behavior can be used to
125 /// restrict the allowable results (via triggering of an error) of linking
126 /// IDs with the **Override** behavior.
129 /// Uses the specified value, regardless of the behavior or value of the
130 /// other module. If both modules specify **Override**, but the values
131 /// differ, an error will be emitted.
134 /// Appends the two values, which are required to be metadata nodes.
137 /// Appends the two values, which are required to be metadata
138 /// nodes. However, duplicate entries in the second list are dropped
139 /// during the append operation.
142 /// Takes the max of the two values, which are required to be integers.
146 ModFlagBehaviorFirstVal = Error,
147 ModFlagBehaviorLastVal = Max
150 /// Checks if Metadata represents a valid ModFlagBehavior, and stores the
151 /// converted result in MFB.
152 static bool isValidModFlagBehavior(Metadata *MD, ModFlagBehavior &MFB);
154 struct ModuleFlagEntry {
155 ModFlagBehavior Behavior;
159 ModuleFlagEntry(ModFlagBehavior B, MDString *K, Metadata *V)
160 : Behavior(B), Key(K), Val(V) {}
164 /// @name Member Variables
167 LLVMContext &Context; ///< The LLVMContext from which types and
168 ///< constants are allocated.
169 GlobalListType GlobalList; ///< The Global Variables in the module
170 FunctionListType FunctionList; ///< The Functions in the module
171 AliasListType AliasList; ///< The Aliases in the module
172 IFuncListType IFuncList; ///< The IFuncs in the module
173 NamedMDListType NamedMDList; ///< The named metadata in the module
174 std::string GlobalScopeAsm; ///< Inline Asm at global scope.
175 ValueSymbolTable *ValSymTab; ///< Symbol table for values
176 ComdatSymTabType ComdatSymTab; ///< Symbol table for COMDATs
177 std::unique_ptr<MemoryBuffer>
178 OwnedMemoryBuffer; ///< Memory buffer directly owned by this
179 ///< module, for legacy clients only.
180 std::unique_ptr<GVMaterializer>
181 Materializer; ///< Used to materialize GlobalValues
182 std::string ModuleID; ///< Human readable identifier for the module
183 std::string SourceFileName; ///< Original source file name for module,
184 ///< recorded in bitcode.
185 std::string TargetTriple; ///< Platform target triple Module compiled on
186 ///< Format: (arch)(sub)-(vendor)-(sys0-(abi)
187 void *NamedMDSymTab; ///< NamedMDNode names.
188 DataLayout DL; ///< DataLayout associated with the module
190 friend class Constant;
193 /// @name Constructors
196 /// The Module constructor. Note that there is no default constructor. You
197 /// must provide a name for the module upon construction.
198 explicit Module(StringRef ModuleID, LLVMContext& C);
199 /// The module destructor. This will dropAllReferences.
203 /// @name Module Level Accessors
206 /// Get the module identifier which is, essentially, the name of the module.
207 /// @returns the module identifier as a string
208 const std::string &getModuleIdentifier() const { return ModuleID; }
210 /// Returns the number of non-debug IR instructions in the module.
211 /// This is equivalent to the sum of the IR instruction counts of each
212 /// function contained in the module.
213 unsigned getInstructionCount();
215 /// Get the module's original source file name. When compiling from
216 /// bitcode, this is taken from a bitcode record where it was recorded.
217 /// For other compiles it is the same as the ModuleID, which would
218 /// contain the source file name.
219 const std::string &getSourceFileName() const { return SourceFileName; }
221 /// Get a short "name" for the module.
223 /// This is useful for debugging or logging. It is essentially a convenience
224 /// wrapper around getModuleIdentifier().
225 StringRef getName() const { return ModuleID; }
227 /// Get the data layout string for the module's target platform. This is
228 /// equivalent to getDataLayout()->getStringRepresentation().
229 const std::string &getDataLayoutStr() const {
230 return DL.getStringRepresentation();
233 /// Get the data layout for the module's target platform.
234 const DataLayout &getDataLayout() const;
236 /// Get the target triple which is a string describing the target host.
237 /// @returns a string containing the target triple.
238 const std::string &getTargetTriple() const { return TargetTriple; }
240 /// Get the global data context.
241 /// @returns LLVMContext - a container for LLVM's global information
242 LLVMContext &getContext() const { return Context; }
244 /// Get any module-scope inline assembly blocks.
245 /// @returns a string containing the module-scope inline assembly blocks.
246 const std::string &getModuleInlineAsm() const { return GlobalScopeAsm; }
248 /// Get a RandomNumberGenerator salted for use with this module. The
249 /// RNG can be seeded via -rng-seed=<uint64> and is salted with the
250 /// ModuleID and the provided pass salt. The returned RNG should not
251 /// be shared across threads or passes.
253 /// A unique RNG per pass ensures a reproducible random stream even
254 /// when other randomness consuming passes are added or removed. In
255 /// addition, the random stream will be reproducible across LLVM
256 /// versions when the pass does not change.
257 std::unique_ptr<RandomNumberGenerator> createRNG(const Pass* P) const;
259 /// Return true if size-info optimization remark is enabled, false
261 bool shouldEmitInstrCountChangedRemark() {
262 return getContext().getDiagHandlerPtr()->isAnalysisRemarkEnabled(
267 /// @name Module Level Mutators
270 /// Set the module identifier.
271 void setModuleIdentifier(StringRef ID) { ModuleID = ID; }
273 /// Set the module's original source file name.
274 void setSourceFileName(StringRef Name) { SourceFileName = Name; }
276 /// Set the data layout
277 void setDataLayout(StringRef Desc);
278 void setDataLayout(const DataLayout &Other);
280 /// Set the target triple.
281 void setTargetTriple(StringRef T) { TargetTriple = T; }
283 /// Set the module-scope inline assembly blocks.
284 /// A trailing newline is added if the input doesn't have one.
285 void setModuleInlineAsm(StringRef Asm) {
286 GlobalScopeAsm = Asm;
287 if (!GlobalScopeAsm.empty() && GlobalScopeAsm.back() != '\n')
288 GlobalScopeAsm += '\n';
291 /// Append to the module-scope inline assembly blocks.
292 /// A trailing newline is added if the input doesn't have one.
293 void appendModuleInlineAsm(StringRef Asm) {
294 GlobalScopeAsm += Asm;
295 if (!GlobalScopeAsm.empty() && GlobalScopeAsm.back() != '\n')
296 GlobalScopeAsm += '\n';
300 /// @name Generic Value Accessors
303 /// Return the global value in the module with the specified name, of
304 /// arbitrary type. This method returns null if a global with the specified
305 /// name is not found.
306 GlobalValue *getNamedValue(StringRef Name) const;
308 /// Return a unique non-zero ID for the specified metadata kind. This ID is
309 /// uniqued across modules in the current LLVMContext.
310 unsigned getMDKindID(StringRef Name) const;
312 /// Populate client supplied SmallVector with the name for custom metadata IDs
313 /// registered in this LLVMContext.
314 void getMDKindNames(SmallVectorImpl<StringRef> &Result) const;
316 /// Populate client supplied SmallVector with the bundle tags registered in
317 /// this LLVMContext. The bundle tags are ordered by increasing bundle IDs.
318 /// \see LLVMContext::getOperandBundleTagID
319 void getOperandBundleTags(SmallVectorImpl<StringRef> &Result) const;
321 /// Return the type with the specified name, or null if there is none by that
323 StructType *getTypeByName(StringRef Name) const;
325 std::vector<StructType *> getIdentifiedStructTypes() const;
328 /// @name Function Accessors
331 /// Look up the specified function in the module symbol table. Four
333 /// 1. If it does not exist, add a prototype for the function and return it.
334 /// 2. If it exists, and has a local linkage, the existing function is
335 /// renamed and a new one is inserted.
336 /// 3. Otherwise, if the existing function has the correct prototype, return
337 /// the existing function.
338 /// 4. Finally, the function exists but has the wrong prototype: return the
339 /// function with a constantexpr cast to the right prototype.
340 Constant *getOrInsertFunction(StringRef Name, FunctionType *T,
341 AttributeList AttributeList);
343 Constant *getOrInsertFunction(StringRef Name, FunctionType *T);
345 /// Look up the specified function in the module symbol table. If it does not
346 /// exist, add a prototype for the function and return it. This function
347 /// guarantees to return a constant of pointer to the specified function type
348 /// or a ConstantExpr BitCast of that type if the named function has a
349 /// different type. This version of the method takes a list of
350 /// function arguments, which makes it easier for clients to use.
351 template<typename... ArgsTy>
352 Constant *getOrInsertFunction(StringRef Name,
353 AttributeList AttributeList,
354 Type *RetTy, ArgsTy... Args)
356 SmallVector<Type*, sizeof...(ArgsTy)> ArgTys{Args...};
357 return getOrInsertFunction(Name,
358 FunctionType::get(RetTy, ArgTys, false),
362 /// Same as above, but without the attributes.
363 template<typename... ArgsTy>
364 Constant *getOrInsertFunction(StringRef Name, Type *RetTy, ArgsTy... Args) {
365 return getOrInsertFunction(Name, AttributeList{}, RetTy, Args...);
368 /// Look up the specified function in the module symbol table. If it does not
369 /// exist, return null.
370 Function *getFunction(StringRef Name) const;
373 /// @name Global Variable Accessors
376 /// Look up the specified global variable in the module symbol table. If it
377 /// does not exist, return null. If AllowInternal is set to true, this
378 /// function will return types that have InternalLinkage. By default, these
379 /// types are not returned.
380 GlobalVariable *getGlobalVariable(StringRef Name) const {
381 return getGlobalVariable(Name, false);
384 GlobalVariable *getGlobalVariable(StringRef Name, bool AllowInternal) const;
386 GlobalVariable *getGlobalVariable(StringRef Name,
387 bool AllowInternal = false) {
388 return static_cast<const Module *>(this)->getGlobalVariable(Name,
392 /// Return the global variable in the module with the specified name, of
393 /// arbitrary type. This method returns null if a global with the specified
394 /// name is not found.
395 const GlobalVariable *getNamedGlobal(StringRef Name) const {
396 return getGlobalVariable(Name, true);
398 GlobalVariable *getNamedGlobal(StringRef Name) {
399 return const_cast<GlobalVariable *>(
400 static_cast<const Module *>(this)->getNamedGlobal(Name));
403 /// Look up the specified global in the module symbol table.
404 /// 1. If it does not exist, add a declaration of the global and return it.
405 /// 2. Else, the global exists but has the wrong type: return the function
406 /// with a constantexpr cast to the right type.
407 /// 3. Finally, if the existing global is the correct declaration, return
408 /// the existing global.
409 Constant *getOrInsertGlobal(StringRef Name, Type *Ty);
412 /// @name Global Alias Accessors
415 /// Return the global alias in the module with the specified name, of
416 /// arbitrary type. This method returns null if a global with the specified
417 /// name is not found.
418 GlobalAlias *getNamedAlias(StringRef Name) const;
421 /// @name Global IFunc Accessors
424 /// Return the global ifunc in the module with the specified name, of
425 /// arbitrary type. This method returns null if a global with the specified
426 /// name is not found.
427 GlobalIFunc *getNamedIFunc(StringRef Name) const;
430 /// @name Named Metadata Accessors
433 /// Return the first NamedMDNode in the module with the specified name. This
434 /// method returns null if a NamedMDNode with the specified name is not found.
435 NamedMDNode *getNamedMetadata(const Twine &Name) const;
437 /// Return the named MDNode in the module with the specified name. This method
438 /// returns a new NamedMDNode if a NamedMDNode with the specified name is not
440 NamedMDNode *getOrInsertNamedMetadata(StringRef Name);
442 /// Remove the given NamedMDNode from this module and delete it.
443 void eraseNamedMetadata(NamedMDNode *NMD);
446 /// @name Comdat Accessors
449 /// Return the Comdat in the module with the specified name. It is created
450 /// if it didn't already exist.
451 Comdat *getOrInsertComdat(StringRef Name);
454 /// @name Module Flags Accessors
457 /// Returns the module flags in the provided vector.
458 void getModuleFlagsMetadata(SmallVectorImpl<ModuleFlagEntry> &Flags) const;
460 /// Return the corresponding value if Key appears in module flags, otherwise
462 Metadata *getModuleFlag(StringRef Key) const;
464 /// Returns the NamedMDNode in the module that represents module-level flags.
465 /// This method returns null if there are no module-level flags.
466 NamedMDNode *getModuleFlagsMetadata() const;
468 /// Returns the NamedMDNode in the module that represents module-level flags.
469 /// If module-level flags aren't found, it creates the named metadata that
471 NamedMDNode *getOrInsertModuleFlagsMetadata();
473 /// Add a module-level flag to the module-level flags metadata. It will create
474 /// the module-level flags named metadata if it doesn't already exist.
475 void addModuleFlag(ModFlagBehavior Behavior, StringRef Key, Metadata *Val);
476 void addModuleFlag(ModFlagBehavior Behavior, StringRef Key, Constant *Val);
477 void addModuleFlag(ModFlagBehavior Behavior, StringRef Key, uint32_t Val);
478 void addModuleFlag(MDNode *Node);
481 /// @name Materialization
484 /// Sets the GVMaterializer to GVM. This module must not yet have a
485 /// Materializer. To reset the materializer for a module that already has one,
486 /// call materializeAll first. Destroying this module will destroy
487 /// its materializer without materializing any more GlobalValues. Without
488 /// destroying the Module, there is no way to detach or destroy a materializer
489 /// without materializing all the GVs it controls, to avoid leaving orphan
490 /// unmaterialized GVs.
491 void setMaterializer(GVMaterializer *GVM);
492 /// Retrieves the GVMaterializer, if any, for this Module.
493 GVMaterializer *getMaterializer() const { return Materializer.get(); }
494 bool isMaterialized() const { return !getMaterializer(); }
496 /// Make sure the GlobalValue is fully read.
497 llvm::Error materialize(GlobalValue *GV);
499 /// Make sure all GlobalValues in this Module are fully read and clear the
501 llvm::Error materializeAll();
503 llvm::Error materializeMetadata();
506 /// @name Direct access to the globals list, functions list, and symbol table
509 /// Get the Module's list of global variables (constant).
510 const GlobalListType &getGlobalList() const { return GlobalList; }
511 /// Get the Module's list of global variables.
512 GlobalListType &getGlobalList() { return GlobalList; }
514 static GlobalListType Module::*getSublistAccess(GlobalVariable*) {
515 return &Module::GlobalList;
518 /// Get the Module's list of functions (constant).
519 const FunctionListType &getFunctionList() const { return FunctionList; }
520 /// Get the Module's list of functions.
521 FunctionListType &getFunctionList() { return FunctionList; }
522 static FunctionListType Module::*getSublistAccess(Function*) {
523 return &Module::FunctionList;
526 /// Get the Module's list of aliases (constant).
527 const AliasListType &getAliasList() const { return AliasList; }
528 /// Get the Module's list of aliases.
529 AliasListType &getAliasList() { return AliasList; }
531 static AliasListType Module::*getSublistAccess(GlobalAlias*) {
532 return &Module::AliasList;
535 /// Get the Module's list of ifuncs (constant).
536 const IFuncListType &getIFuncList() const { return IFuncList; }
537 /// Get the Module's list of ifuncs.
538 IFuncListType &getIFuncList() { return IFuncList; }
540 static IFuncListType Module::*getSublistAccess(GlobalIFunc*) {
541 return &Module::IFuncList;
544 /// Get the Module's list of named metadata (constant).
545 const NamedMDListType &getNamedMDList() const { return NamedMDList; }
546 /// Get the Module's list of named metadata.
547 NamedMDListType &getNamedMDList() { return NamedMDList; }
549 static NamedMDListType Module::*getSublistAccess(NamedMDNode*) {
550 return &Module::NamedMDList;
553 /// Get the symbol table of global variable and function identifiers
554 const ValueSymbolTable &getValueSymbolTable() const { return *ValSymTab; }
555 /// Get the Module's symbol table of global variable and function identifiers.
556 ValueSymbolTable &getValueSymbolTable() { return *ValSymTab; }
558 /// Get the Module's symbol table for COMDATs (constant).
559 const ComdatSymTabType &getComdatSymbolTable() const { return ComdatSymTab; }
560 /// Get the Module's symbol table for COMDATs.
561 ComdatSymTabType &getComdatSymbolTable() { return ComdatSymTab; }
564 /// @name Global Variable Iteration
567 global_iterator global_begin() { return GlobalList.begin(); }
568 const_global_iterator global_begin() const { return GlobalList.begin(); }
569 global_iterator global_end () { return GlobalList.end(); }
570 const_global_iterator global_end () const { return GlobalList.end(); }
571 bool global_empty() const { return GlobalList.empty(); }
573 iterator_range<global_iterator> globals() {
574 return make_range(global_begin(), global_end());
576 iterator_range<const_global_iterator> globals() const {
577 return make_range(global_begin(), global_end());
581 /// @name Function Iteration
584 iterator begin() { return FunctionList.begin(); }
585 const_iterator begin() const { return FunctionList.begin(); }
586 iterator end () { return FunctionList.end(); }
587 const_iterator end () const { return FunctionList.end(); }
588 reverse_iterator rbegin() { return FunctionList.rbegin(); }
589 const_reverse_iterator rbegin() const{ return FunctionList.rbegin(); }
590 reverse_iterator rend() { return FunctionList.rend(); }
591 const_reverse_iterator rend() const { return FunctionList.rend(); }
592 size_t size() const { return FunctionList.size(); }
593 bool empty() const { return FunctionList.empty(); }
595 iterator_range<iterator> functions() {
596 return make_range(begin(), end());
598 iterator_range<const_iterator> functions() const {
599 return make_range(begin(), end());
603 /// @name Alias Iteration
606 alias_iterator alias_begin() { return AliasList.begin(); }
607 const_alias_iterator alias_begin() const { return AliasList.begin(); }
608 alias_iterator alias_end () { return AliasList.end(); }
609 const_alias_iterator alias_end () const { return AliasList.end(); }
610 size_t alias_size () const { return AliasList.size(); }
611 bool alias_empty() const { return AliasList.empty(); }
613 iterator_range<alias_iterator> aliases() {
614 return make_range(alias_begin(), alias_end());
616 iterator_range<const_alias_iterator> aliases() const {
617 return make_range(alias_begin(), alias_end());
621 /// @name IFunc Iteration
624 ifunc_iterator ifunc_begin() { return IFuncList.begin(); }
625 const_ifunc_iterator ifunc_begin() const { return IFuncList.begin(); }
626 ifunc_iterator ifunc_end () { return IFuncList.end(); }
627 const_ifunc_iterator ifunc_end () const { return IFuncList.end(); }
628 size_t ifunc_size () const { return IFuncList.size(); }
629 bool ifunc_empty() const { return IFuncList.empty(); }
631 iterator_range<ifunc_iterator> ifuncs() {
632 return make_range(ifunc_begin(), ifunc_end());
634 iterator_range<const_ifunc_iterator> ifuncs() const {
635 return make_range(ifunc_begin(), ifunc_end());
639 /// @name Convenience iterators
642 using global_object_iterator =
643 concat_iterator<GlobalObject, iterator, global_iterator>;
644 using const_global_object_iterator =
645 concat_iterator<const GlobalObject, const_iterator,
646 const_global_iterator>;
648 iterator_range<global_object_iterator> global_objects() {
649 return concat<GlobalObject>(functions(), globals());
651 iterator_range<const_global_object_iterator> global_objects() const {
652 return concat<const GlobalObject>(functions(), globals());
655 global_object_iterator global_object_begin() {
656 return global_objects().begin();
658 global_object_iterator global_object_end() { return global_objects().end(); }
660 const_global_object_iterator global_object_begin() const {
661 return global_objects().begin();
663 const_global_object_iterator global_object_end() const {
664 return global_objects().end();
667 using global_value_iterator =
668 concat_iterator<GlobalValue, iterator, global_iterator, alias_iterator,
670 using const_global_value_iterator =
671 concat_iterator<const GlobalValue, const_iterator, const_global_iterator,
672 const_alias_iterator, const_ifunc_iterator>;
674 iterator_range<global_value_iterator> global_values() {
675 return concat<GlobalValue>(functions(), globals(), aliases(), ifuncs());
677 iterator_range<const_global_value_iterator> global_values() const {
678 return concat<const GlobalValue>(functions(), globals(), aliases(),
682 global_value_iterator global_value_begin() { return global_values().begin(); }
683 global_value_iterator global_value_end() { return global_values().end(); }
685 const_global_value_iterator global_value_begin() const {
686 return global_values().begin();
688 const_global_value_iterator global_value_end() const {
689 return global_values().end();
693 /// @name Named Metadata Iteration
696 named_metadata_iterator named_metadata_begin() { return NamedMDList.begin(); }
697 const_named_metadata_iterator named_metadata_begin() const {
698 return NamedMDList.begin();
701 named_metadata_iterator named_metadata_end() { return NamedMDList.end(); }
702 const_named_metadata_iterator named_metadata_end() const {
703 return NamedMDList.end();
706 size_t named_metadata_size() const { return NamedMDList.size(); }
707 bool named_metadata_empty() const { return NamedMDList.empty(); }
709 iterator_range<named_metadata_iterator> named_metadata() {
710 return make_range(named_metadata_begin(), named_metadata_end());
712 iterator_range<const_named_metadata_iterator> named_metadata() const {
713 return make_range(named_metadata_begin(), named_metadata_end());
716 /// An iterator for DICompileUnits that skips those marked NoDebug.
717 class debug_compile_units_iterator
718 : public std::iterator<std::input_iterator_tag, DICompileUnit *> {
722 void SkipNoDebugCUs();
725 explicit debug_compile_units_iterator(NamedMDNode *CUs, unsigned Idx)
726 : CUs(CUs), Idx(Idx) {
730 debug_compile_units_iterator &operator++() {
736 debug_compile_units_iterator operator++(int) {
737 debug_compile_units_iterator T(*this);
742 bool operator==(const debug_compile_units_iterator &I) const {
746 bool operator!=(const debug_compile_units_iterator &I) const {
750 DICompileUnit *operator*() const;
751 DICompileUnit *operator->() const;
754 debug_compile_units_iterator debug_compile_units_begin() const {
755 auto *CUs = getNamedMetadata("llvm.dbg.cu");
756 return debug_compile_units_iterator(CUs, 0);
759 debug_compile_units_iterator debug_compile_units_end() const {
760 auto *CUs = getNamedMetadata("llvm.dbg.cu");
761 return debug_compile_units_iterator(CUs, CUs ? CUs->getNumOperands() : 0);
764 /// Return an iterator for all DICompileUnits listed in this Module's
765 /// llvm.dbg.cu named metadata node and aren't explicitly marked as
767 iterator_range<debug_compile_units_iterator> debug_compile_units() const {
768 auto *CUs = getNamedMetadata("llvm.dbg.cu");
770 debug_compile_units_iterator(CUs, 0),
771 debug_compile_units_iterator(CUs, CUs ? CUs->getNumOperands() : 0));
775 /// Destroy ConstantArrays in LLVMContext if they are not used.
776 /// ConstantArrays constructed during linking can cause quadratic memory
777 /// explosion. Releasing all unused constants can cause a 20% LTO compile-time
778 /// slowdown for a large application.
780 /// NOTE: Constants are currently owned by LLVMContext. This can then only
781 /// be called where all uses of the LLVMContext are understood.
782 void dropTriviallyDeadConstantArrays();
784 /// @name Utility functions for printing and dumping Module objects
787 /// Print the module to an output stream with an optional
788 /// AssemblyAnnotationWriter. If \c ShouldPreserveUseListOrder, then include
789 /// uselistorder directives so that use-lists can be recreated when reading
791 void print(raw_ostream &OS, AssemblyAnnotationWriter *AAW,
792 bool ShouldPreserveUseListOrder = false,
793 bool IsForDebug = false) const;
795 /// Dump the module to stderr (for debugging).
798 /// This function causes all the subinstructions to "let go" of all references
799 /// that they are maintaining. This allows one to 'delete' a whole class at
800 /// a time, even though there may be circular references... first all
801 /// references are dropped, and all use counts go to zero. Then everything
802 /// is delete'd for real. Note that no operations are valid on an object
803 /// that has "dropped all references", except operator delete.
804 void dropAllReferences();
807 /// @name Utility functions for querying Debug information.
810 /// Returns the Number of Register ParametersDwarf Version by checking
812 unsigned getNumberRegisterParameters() const;
814 /// Returns the Dwarf Version by checking module flags.
815 unsigned getDwarfVersion() const;
817 /// Returns the CodeView Version by checking module flags.
818 /// Returns zero if not present in module.
819 unsigned getCodeViewFlag() const;
822 /// @name Utility functions for querying and setting PIC level
825 /// Returns the PIC level (small or large model)
826 PICLevel::Level getPICLevel() const;
828 /// Set the PIC level (small or large model)
829 void setPICLevel(PICLevel::Level PL);
833 /// @name Utility functions for querying and setting PIE level
836 /// Returns the PIE level (small or large model)
837 PIELevel::Level getPIELevel() const;
839 /// Set the PIE level (small or large model)
840 void setPIELevel(PIELevel::Level PL);
843 /// @name Utility functions for querying and setting PGO summary
846 /// Attach profile summary metadata to this module.
847 void setProfileSummary(Metadata *M);
849 /// Returns profile summary metadata
850 Metadata *getProfileSummary();
853 /// Returns true if PLT should be avoided for RTLib calls.
854 bool getRtLibUseGOT() const;
856 /// Set that PLT should be avoid for RTLib calls.
857 void setRtLibUseGOT();
860 /// Take ownership of the given memory buffer.
861 void setOwnedMemoryBuffer(std::unique_ptr<MemoryBuffer> MB);
864 /// Given "llvm.used" or "llvm.compiler.used" as a global name, collect
865 /// the initializer elements of that global in Set and return the global itself.
866 GlobalVariable *collectUsedGlobalVariables(const Module &M,
867 SmallPtrSetImpl<GlobalValue *> &Set,
870 /// An raw_ostream inserter for modules.
871 inline raw_ostream &operator<<(raw_ostream &O, const Module &M) {
876 // Create wrappers for C Binding types (see CBindingWrapping.h).
877 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Module, LLVMModuleRef)
879 /* LLVMModuleProviderRef exists for historical reasons, but now just holds a
882 inline Module *unwrap(LLVMModuleProviderRef MP) {
883 return reinterpret_cast<Module*>(MP);
886 } // end namespace llvm
888 #endif // LLVM_IR_MODULE_H