Check in LLVM r95781.
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
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+//===--- CodeGenModule.h - Per-Module state for LLVM CodeGen ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is the internal per-translation-unit state used for llvm translation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_CODEGEN_CODEGENMODULE_H
+#define CLANG_CODEGEN_CODEGENMODULE_H
+
+#include "clang/Basic/LangOptions.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclObjC.h"
+#include "CGBlocks.h"
+#include "CGCall.h"
+#include "CGCXX.h"
+#include "CGVtable.h"
+#include "CodeGenTypes.h"
+#include "GlobalDecl.h"
+#include "Mangle.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/Support/ValueHandle.h"
+#include <list>
+
+namespace llvm {
+ class Module;
+ class Constant;
+ class Function;
+ class GlobalValue;
+ class TargetData;
+ class FunctionType;
+ class LLVMContext;
+}
+
+namespace clang {
+ class TargetCodeGenInfo;
+ class ASTContext;
+ class FunctionDecl;
+ class IdentifierInfo;
+ class ObjCMethodDecl;
+ class ObjCImplementationDecl;
+ class ObjCCategoryImplDecl;
+ class ObjCProtocolDecl;
+ class ObjCEncodeExpr;
+ class BlockExpr;
+ class CharUnits;
+ class Decl;
+ class Expr;
+ class Stmt;
+ class StringLiteral;
+ class NamedDecl;
+ class ValueDecl;
+ class VarDecl;
+ class LangOptions;
+ class CodeGenOptions;
+ class Diagnostic;
+ class AnnotateAttr;
+ class CXXDestructorDecl;
+
+namespace CodeGen {
+
+ class CodeGenFunction;
+ class CGDebugInfo;
+ class CGObjCRuntime;
+
+
+/// CodeGenModule - This class organizes the cross-function state that is used
+/// while generating LLVM code.
+class CodeGenModule : public BlockModule {
+ CodeGenModule(const CodeGenModule&); // DO NOT IMPLEMENT
+ void operator=(const CodeGenModule&); // DO NOT IMPLEMENT
+
+ typedef std::vector<std::pair<llvm::Constant*, int> > CtorList;
+
+ ASTContext &Context;
+ const LangOptions &Features;
+ const CodeGenOptions &CodeGenOpts;
+ llvm::Module &TheModule;
+ const llvm::TargetData &TheTargetData;
+ mutable const TargetCodeGenInfo *TheTargetCodeGenInfo;
+ Diagnostic &Diags;
+ CodeGenTypes Types;
+ MangleContext MangleCtx;
+
+ /// VtableInfo - Holds information about C++ vtables.
+ CGVtableInfo VtableInfo;
+
+ CGObjCRuntime* Runtime;
+ CGDebugInfo* DebugInfo;
+
+ llvm::Function *MemCpyFn;
+ llvm::Function *MemMoveFn;
+ llvm::Function *MemSetFn;
+
+ /// GlobalDeclMap - Mapping of decl names (represented as unique
+ /// character pointers from either the identifier table or the set
+ /// of mangled names) to global variables we have already
+ /// emitted. Note that the entries in this map are the actual
+ /// globals and therefore may not be of the same type as the decl,
+ /// they should be bitcasted on retrieval. Also note that the
+ /// globals are keyed on their source mangled name, not the global name
+ /// (which may change with attributes such as asm-labels). The key
+ /// to this map should be generated using getMangledName().
+ ///
+ /// Note that this map always lines up exactly with the contents of the LLVM
+ /// IR symbol table, but this is quicker to query since it is doing uniqued
+ /// pointer lookups instead of full string lookups.
+ llvm::DenseMap<const char*, llvm::GlobalValue*> GlobalDeclMap;
+
+ /// \brief Contains the strings used for mangled names.
+ ///
+ /// FIXME: Eventually, this should map from the semantic/canonical
+ /// declaration for each global entity to its mangled name (if it
+ /// has one).
+ llvm::StringSet<> MangledNames;
+
+ /// DeferredDecls - This contains all the decls which have definitions but
+ /// which are deferred for emission and therefore should only be output if
+ /// they are actually used. If a decl is in this, then it is known to have
+ /// not been referenced yet. The key to this map is a uniqued mangled name.
+ llvm::DenseMap<const char*, GlobalDecl> DeferredDecls;
+
+ /// DeferredDeclsToEmit - This is a list of deferred decls which we have seen
+ /// that *are* actually referenced. These get code generated when the module
+ /// is done.
+ std::vector<GlobalDecl> DeferredDeclsToEmit;
+
+ /// LLVMUsed - List of global values which are required to be
+ /// present in the object file; bitcast to i8*. This is used for
+ /// forcing visibility of symbols which may otherwise be optimized
+ /// out.
+ std::vector<llvm::WeakVH> LLVMUsed;
+
+ /// GlobalCtors - Store the list of global constructors and their respective
+ /// priorities to be emitted when the translation unit is complete.
+ CtorList GlobalCtors;
+
+ /// GlobalDtors - Store the list of global destructors and their respective
+ /// priorities to be emitted when the translation unit is complete.
+ CtorList GlobalDtors;
+
+ std::vector<llvm::Constant*> Annotations;
+
+ llvm::StringMap<llvm::Constant*> CFConstantStringMap;
+ llvm::StringMap<llvm::Constant*> ConstantStringMap;
+
+ /// CXXGlobalInits - Variables with global initializers that need to run
+ /// before main.
+ std::vector<llvm::Constant*> CXXGlobalInits;
+
+ /// CFConstantStringClassRef - Cached reference to the class for constant
+ /// strings. This value has type int * but is actually an Obj-C class pointer.
+ llvm::Constant *CFConstantStringClassRef;
+
+ /// Lazily create the Objective-C runtime
+ void createObjCRuntime();
+
+ llvm::LLVMContext &VMContext;
+public:
+ CodeGenModule(ASTContext &C, const CodeGenOptions &CodeGenOpts,
+ llvm::Module &M, const llvm::TargetData &TD, Diagnostic &Diags);
+
+ ~CodeGenModule();
+
+ /// Release - Finalize LLVM code generation.
+ void Release();
+
+ /// getObjCRuntime() - Return a reference to the configured
+ /// Objective-C runtime.
+ CGObjCRuntime &getObjCRuntime() {
+ if (!Runtime) createObjCRuntime();
+ return *Runtime;
+ }
+
+ /// hasObjCRuntime() - Return true iff an Objective-C runtime has
+ /// been configured.
+ bool hasObjCRuntime() { return !!Runtime; }
+
+ CGDebugInfo *getDebugInfo() { return DebugInfo; }
+ ASTContext &getContext() const { return Context; }
+ const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
+ const LangOptions &getLangOptions() const { return Features; }
+ llvm::Module &getModule() const { return TheModule; }
+ CodeGenTypes &getTypes() { return Types; }
+ MangleContext &getMangleContext() { return MangleCtx; }
+ CGVtableInfo &getVtableInfo() { return VtableInfo; }
+ Diagnostic &getDiags() const { return Diags; }
+ const llvm::TargetData &getTargetData() const { return TheTargetData; }
+ llvm::LLVMContext &getLLVMContext() { return VMContext; }
+ const TargetCodeGenInfo &getTargetCodeGenInfo() const;
+
+ /// getDeclVisibilityMode - Compute the visibility of the decl \arg D.
+ LangOptions::VisibilityMode getDeclVisibilityMode(const Decl *D) const;
+
+ /// setGlobalVisibility - Set the visibility for the given LLVM
+ /// GlobalValue.
+ void setGlobalVisibility(llvm::GlobalValue *GV, const Decl *D) const;
+
+ /// GetAddrOfGlobalVar - Return the llvm::Constant for the address of the
+ /// given global variable. If Ty is non-null and if the global doesn't exist,
+ /// then it will be greated with the specified type instead of whatever the
+ /// normal requested type would be.
+ llvm::Constant *GetAddrOfGlobalVar(const VarDecl *D,
+ const llvm::Type *Ty = 0);
+
+ /// GetAddrOfFunction - Return the address of the given function. If Ty is
+ /// non-null, then this function will use the specified type if it has to
+ /// create it.
+ llvm::Constant *GetAddrOfFunction(GlobalDecl GD,
+ const llvm::Type *Ty = 0);
+
+ /// GetAddrOfRTTIDescriptor - Get the address of the RTTI descriptor
+ /// for the given type.
+ llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty);
+
+ llvm::Constant *GetAddrOfThunk(GlobalDecl GD,
+ const ThunkAdjustment &ThisAdjustment);
+ llvm::Constant *GetAddrOfCovariantThunk(GlobalDecl GD,
+ const CovariantThunkAdjustment &ThisAdjustment);
+ void BuildThunksForVirtual(GlobalDecl GD);
+ void BuildThunksForVirtualRecursive(GlobalDecl GD, GlobalDecl BaseOGD);
+
+ /// BuildThunk - Build a thunk for the given method.
+ llvm::Constant *BuildThunk(GlobalDecl GD, bool Extern,
+ const ThunkAdjustment &ThisAdjustment);
+
+ /// BuildCoVariantThunk - Build a thunk for the given method
+ llvm::Constant *
+ BuildCovariantThunk(const GlobalDecl &GD, bool Extern,
+ const CovariantThunkAdjustment &Adjustment);
+
+ /// GetNonVirtualBaseClassOffset - Returns the offset from a derived class to
+ /// its base class. Returns null if the offset is 0.
+ llvm::Constant *
+ GetNonVirtualBaseClassOffset(const CXXRecordDecl *ClassDecl,
+ const CXXRecordDecl *BaseClassDecl);
+
+ /// ComputeThunkAdjustment - Returns the two parts required to compute the
+ /// offset for an object.
+ ThunkAdjustment ComputeThunkAdjustment(const CXXRecordDecl *ClassDecl,
+ const CXXRecordDecl *BaseClassDecl);
+
+ /// GetStringForStringLiteral - Return the appropriate bytes for a string
+ /// literal, properly padded to match the literal type. If only the address of
+ /// a constant is needed consider using GetAddrOfConstantStringLiteral.
+ std::string GetStringForStringLiteral(const StringLiteral *E);
+
+ /// GetAddrOfConstantCFString - Return a pointer to a constant CFString object
+ /// for the given string.
+ llvm::Constant *GetAddrOfConstantCFString(const StringLiteral *Literal);
+
+ /// GetAddrOfConstantStringFromLiteral - Return a pointer to a constant array
+ /// for the given string literal.
+ llvm::Constant *GetAddrOfConstantStringFromLiteral(const StringLiteral *S);
+
+ /// GetAddrOfConstantStringFromObjCEncode - Return a pointer to a constant
+ /// array for the given ObjCEncodeExpr node.
+ llvm::Constant *GetAddrOfConstantStringFromObjCEncode(const ObjCEncodeExpr *);
+
+ /// GetAddrOfConstantString - Returns a pointer to a character array
+ /// containing the literal. This contents are exactly that of the given
+ /// string, i.e. it will not be null terminated automatically; see
+ /// GetAddrOfConstantCString. Note that whether the result is actually a
+ /// pointer to an LLVM constant depends on Feature.WriteableStrings.
+ ///
+ /// The result has pointer to array type.
+ ///
+ /// \param GlobalName If provided, the name to use for the global
+ /// (if one is created).
+ llvm::Constant *GetAddrOfConstantString(const std::string& str,
+ const char *GlobalName=0);
+
+ /// GetAddrOfConstantCString - Returns a pointer to a character array
+ /// containing the literal and a terminating '\0' character. The result has
+ /// pointer to array type.
+ ///
+ /// \param GlobalName If provided, the name to use for the global (if one is
+ /// created).
+ llvm::Constant *GetAddrOfConstantCString(const std::string &str,
+ const char *GlobalName=0);
+
+ /// GetAddrOfCXXConstructor - Return the address of the constructor of the
+ /// given type.
+ llvm::Function *GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
+ CXXCtorType Type);
+
+ /// GetAddrOfCXXDestructor - Return the address of the constructor of the
+ /// given type.
+ llvm::Function *GetAddrOfCXXDestructor(const CXXDestructorDecl *D,
+ CXXDtorType Type);
+
+ /// getBuiltinLibFunction - Given a builtin id for a function like
+ /// "__builtin_fabsf", return a Function* for "fabsf".
+ llvm::Value *getBuiltinLibFunction(const FunctionDecl *FD,
+ unsigned BuiltinID);
+
+ llvm::Function *getMemCpyFn();
+ llvm::Function *getMemMoveFn();
+ llvm::Function *getMemSetFn();
+ llvm::Function *getIntrinsic(unsigned IID, const llvm::Type **Tys = 0,
+ unsigned NumTys = 0);
+
+ /// EmitTopLevelDecl - Emit code for a single top level declaration.
+ void EmitTopLevelDecl(Decl *D);
+
+ /// AddUsedGlobal - Add a global which should be forced to be
+ /// present in the object file; these are emitted to the llvm.used
+ /// metadata global.
+ void AddUsedGlobal(llvm::GlobalValue *GV);
+
+ void AddAnnotation(llvm::Constant *C) { Annotations.push_back(C); }
+
+ /// CreateRuntimeFunction - Create a new runtime function with the specified
+ /// type and name.
+ llvm::Constant *CreateRuntimeFunction(const llvm::FunctionType *Ty,
+ const char *Name);
+ /// CreateRuntimeVariable - Create a new runtime global variable with the
+ /// specified type and name.
+ llvm::Constant *CreateRuntimeVariable(const llvm::Type *Ty,
+ const char *Name);
+
+ void UpdateCompletedType(const TagDecl *TD) {
+ // Make sure that this type is translated.
+ Types.UpdateCompletedType(TD);
+ }
+
+ /// EmitConstantExpr - Try to emit the given expression as a
+ /// constant; returns 0 if the expression cannot be emitted as a
+ /// constant.
+ llvm::Constant *EmitConstantExpr(const Expr *E, QualType DestType,
+ CodeGenFunction *CGF = 0);
+
+ /// EmitNullConstant - Return the result of value-initializing the given
+ /// type, i.e. a null expression of the given type. This is usually,
+ /// but not always, an LLVM null constant.
+ llvm::Constant *EmitNullConstant(QualType T);
+
+ llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
+ const AnnotateAttr *AA, unsigned LineNo);
+
+ llvm::Constant *EmitPointerToDataMember(const FieldDecl *FD);
+
+ /// ErrorUnsupported - Print out an error that codegen doesn't support the
+ /// specified stmt yet.
+ /// \param OmitOnError - If true, then this error should only be emitted if no
+ /// other errors have been reported.
+ void ErrorUnsupported(const Stmt *S, const char *Type,
+ bool OmitOnError=false);
+
+ /// ErrorUnsupported - Print out an error that codegen doesn't support the
+ /// specified decl yet.
+ /// \param OmitOnError - If true, then this error should only be emitted if no
+ /// other errors have been reported.
+ void ErrorUnsupported(const Decl *D, const char *Type,
+ bool OmitOnError=false);
+
+ /// SetInternalFunctionAttributes - Set the attributes on the LLVM
+ /// function for the given decl and function info. This applies
+ /// attributes necessary for handling the ABI as well as user
+ /// specified attributes like section.
+ void SetInternalFunctionAttributes(const Decl *D, llvm::Function *F,
+ const CGFunctionInfo &FI);
+
+ /// SetLLVMFunctionAttributes - Set the LLVM function attributes
+ /// (sext, zext, etc).
+ void SetLLVMFunctionAttributes(const Decl *D,
+ const CGFunctionInfo &Info,
+ llvm::Function *F);
+
+ /// SetLLVMFunctionAttributesForDefinition - Set the LLVM function attributes
+ /// which only apply to a function definintion.
+ void SetLLVMFunctionAttributesForDefinition(const Decl *D, llvm::Function *F);
+
+ /// ReturnTypeUsesSret - Return true iff the given type uses 'sret' when used
+ /// as a return type.
+ bool ReturnTypeUsesSret(const CGFunctionInfo &FI);
+
+ /// ConstructAttributeList - Get the LLVM attributes and calling convention to
+ /// use for a particular function type.
+ ///
+ /// \param Info - The function type information.
+ /// \param TargetDecl - The decl these attributes are being constructed
+ /// for. If supplied the attributes applied to this decl may contribute to the
+ /// function attributes and calling convention.
+ /// \param PAL [out] - On return, the attribute list to use.
+ /// \param CallingConv [out] - On return, the LLVM calling convention to use.
+ void ConstructAttributeList(const CGFunctionInfo &Info,
+ const Decl *TargetDecl,
+ AttributeListType &PAL,
+ unsigned &CallingConv);
+
+ const char *getMangledName(const GlobalDecl &D);
+
+ const char *getMangledName(const NamedDecl *ND);
+ const char *getMangledCXXCtorName(const CXXConstructorDecl *D,
+ CXXCtorType Type);
+ const char *getMangledCXXDtorName(const CXXDestructorDecl *D,
+ CXXDtorType Type);
+
+ void EmitTentativeDefinition(const VarDecl *D);
+
+ enum GVALinkage {
+ GVA_Internal,
+ GVA_C99Inline,
+ GVA_CXXInline,
+ GVA_StrongExternal,
+ GVA_TemplateInstantiation
+ };
+
+ /// getVtableLinkage - Return the appropriate linkage for the vtable, VTT,
+ /// and type information of the given class.
+ static llvm::GlobalVariable::LinkageTypes
+ getVtableLinkage(const CXXRecordDecl *RD);
+
+ /// GetTargetTypeStoreSize - Return the store size, in character units, of
+ /// the given LLVM type.
+ CharUnits GetTargetTypeStoreSize(const llvm::Type *Ty) const;
+
+private:
+ /// UniqueMangledName - Unique a name by (if necessary) inserting it into the
+ /// MangledNames string map.
+ const char *UniqueMangledName(const char *NameStart, const char *NameEnd);
+
+ llvm::Constant *GetOrCreateLLVMFunction(const char *MangledName,
+ const llvm::Type *Ty,
+ GlobalDecl D);
+ llvm::Constant *GetOrCreateLLVMGlobal(const char *MangledName,
+ const llvm::PointerType *PTy,
+ const VarDecl *D);
+
+ /// SetCommonAttributes - Set attributes which are common to any
+ /// form of a global definition (alias, Objective-C method,
+ /// function, global variable).
+ ///
+ /// NOTE: This should only be called for definitions.
+ void SetCommonAttributes(const Decl *D, llvm::GlobalValue *GV);
+
+ /// SetFunctionDefinitionAttributes - Set attributes for a global definition.
+ void SetFunctionDefinitionAttributes(const FunctionDecl *D,
+ llvm::GlobalValue *GV);
+
+ /// SetFunctionAttributes - Set function attributes for a function
+ /// declaration.
+ void SetFunctionAttributes(GlobalDecl GD,
+ llvm::Function *F,
+ bool IsIncompleteFunction);
+
+ /// EmitGlobal - Emit code for a singal global function or var decl. Forward
+ /// declarations are emitted lazily.
+ void EmitGlobal(GlobalDecl D);
+
+ void EmitGlobalDefinition(GlobalDecl D);
+
+ void EmitGlobalFunctionDefinition(GlobalDecl GD);
+ void EmitGlobalVarDefinition(const VarDecl *D);
+ void EmitAliasDefinition(const ValueDecl *D);
+ void EmitObjCPropertyImplementations(const ObjCImplementationDecl *D);
+
+ // C++ related functions.
+
+ void EmitNamespace(const NamespaceDecl *D);
+ void EmitLinkageSpec(const LinkageSpecDecl *D);
+
+ /// EmitCXXConstructors - Emit constructors (base, complete) from a
+ /// C++ constructor Decl.
+ void EmitCXXConstructors(const CXXConstructorDecl *D);
+
+ /// EmitCXXConstructor - Emit a single constructor with the given type from
+ /// a C++ constructor Decl.
+ void EmitCXXConstructor(const CXXConstructorDecl *D, CXXCtorType Type);
+
+ /// EmitCXXDestructors - Emit destructors (base, complete) from a
+ /// C++ destructor Decl.
+ void EmitCXXDestructors(const CXXDestructorDecl *D);
+
+ /// EmitCXXDestructor - Emit a single destructor with the given type from
+ /// a C++ destructor Decl.
+ void EmitCXXDestructor(const CXXDestructorDecl *D, CXXDtorType Type);
+
+ /// EmitCXXGlobalInitFunc - Emit a function that initializes C++ globals.
+ void EmitCXXGlobalInitFunc();
+
+ void EmitCXXGlobalVarDeclInitFunc(const VarDecl *D);
+
+ // FIXME: Hardcoding priority here is gross.
+ void AddGlobalCtor(llvm::Function *Ctor, int Priority=65535);
+ void AddGlobalDtor(llvm::Function *Dtor, int Priority=65535);
+
+ /// EmitCtorList - Generates a global array of functions and priorities using
+ /// the given list and name. This array will have appending linkage and is
+ /// suitable for use as a LLVM constructor or destructor array.
+ void EmitCtorList(const CtorList &Fns, const char *GlobalName);
+
+ void EmitAnnotations(void);
+
+ /// EmitDeferred - Emit any needed decls for which code generation
+ /// was deferred.
+ void EmitDeferred(void);
+
+ /// EmitLLVMUsed - Emit the llvm.used metadata used to force
+ /// references to global which may otherwise be optimized out.
+ void EmitLLVMUsed(void);
+
+ /// MayDeferGeneration - Determine if the given decl can be emitted
+ /// lazily; this is only relevant for definitions. The given decl
+ /// must be either a function or var decl.
+ bool MayDeferGeneration(const ValueDecl *D);
+};
+} // end namespace CodeGen
+} // end namespace clang
+
+#endif