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clang/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/ADT/SmallPtrSet.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;
// WeakRefReferences - A set of references that have only been seen via
// a weakref so far. This is used to remove the weak of the reference if we ever
// see a direct reference or a definition.
llvm::SmallPtrSet<llvm::GlobalValue*, 10> WeakRefReferences;
/// \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;
bool isTargetDarwin() 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;
llvm::Constant *GetAddrOfGlobal(GlobalDecl GD) {
if (isa<CXXConstructorDecl>(GD.getDecl()))
return GetAddrOfCXXConstructor(cast<CXXConstructorDecl>(GD.getDecl()),
GD.getCtorType());
else if (isa<CXXDestructorDecl>(GD.getDecl()))
return GetAddrOfCXXDestructor(cast<CXXDestructorDecl>(GD.getDecl()),
GD.getDtorType());
else if (isa<FunctionDecl>(GD.getDecl()))
return GetAddrOfFunction(GD);
else
return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()));
}
/// 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);
/// GetWeakRefReference - Get a reference to the target of VD.
llvm::Constant *GetWeakRefReference(const ValueDecl *VD);
/// 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::GlobalValue *GetAddrOfCXXConstructor(const CXXConstructorDecl *D,
CXXCtorType Type);
/// GetAddrOfCXXDestructor - Return the address of the constructor of the
/// given type.
llvm::GlobalValue *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,
GVA_ExplicitTemplateInstantiation
};
llvm::GlobalVariable::LinkageTypes
getFunctionLinkage(const FunctionDecl *FD);
/// 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;
std::vector<const CXXRecordDecl*> DeferredVtables;
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.
bool TryEmitDefinitionAsAlias(GlobalDecl Alias, GlobalDecl Target);
bool TryEmitBaseDestructorAsAlias(const CXXDestructorDecl *D);
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
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