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view dmd/aggregate.h @ 1117:4c20fcc4252b
Fun with parameter attributes: For several of the "synthetic" parameters added
to D functions, we can apply noalias and nocapture. They are sret parameters,
'nest' pointers passed to nested functions, and _argptr:
Nocapture:
- Sret and nest are nocapture because they don't represent D-level variables,
and thus the callee can't (validly) obtain a pointer to them, let alone keep
it around after it returns.
- _argptr is nocapture because although the callee has access to it as a
pointer, that pointer is invalidated when it returns.
All three are noalias because they're function-local variables
- Sret and _argptr are noalias because they're freshly alloca'd memory only
used for a single function call that's not allowed to keep an aliasing
pointer to it around (since the parameter is nocapture).
- 'Nest' is noalias because the callee only ever has access to one such pointer
per parent function, and every parent function has a different one.
This commit also ensures attributes set on sret, _arguments and _argptr are
propagated to calls to such functions.
It also adds one exception to the general rule that attributes on function types
should propagate to calls: the type of a delegate's function pointer has a
'nest' parameter, but this can either be a true 'nest' (for delegates to nested
functions) or a 'this' (for delegates to member functions). Since 'this' is
neither noalias nor nocapture, and there's generally no way to tell which one it
is, we remove these attributes at the call site if the callee is a delegate.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Sat, 14 Mar 2009 22:15:31 +0100 |
parents | 96b404ba7eb0 |
children | 1860414bf3b7 |
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// Compiler implementation of the D programming language // Copyright (c) 1999-2008 by Digital Mars // All Rights Reserved // written by Walter Bright // http://www.digitalmars.com // License for redistribution is by either the Artistic License // in artistic.txt, or the GNU General Public License in gnu.txt. // See the included readme.txt for details. #ifndef DMD_AGGREGATE_H #define DMD_AGGREGATE_H #ifdef __DMC__ #pragma once #endif /* __DMC__ */ #include "root.h" #include "dsymbol.h" #include <vector> #include <set> #include <map> struct Identifier; struct Type; struct TypeFunction; struct Expression; struct FuncDeclaration; struct CtorDeclaration; struct DtorDeclaration; struct InvariantDeclaration; struct NewDeclaration; struct DeleteDeclaration; struct InterfaceDeclaration; struct ClassInfoDeclaration; struct VarDeclaration; struct dt_t; namespace llvm { class Type; class Value; class Constant; class ConstantStruct; class GlobalVariable; } struct AggregateDeclaration : ScopeDsymbol { Type *type; unsigned storage_class; enum PROT protection; Type *handle; // 'this' type unsigned structsize; // size of struct unsigned alignsize; // size of struct for alignment purposes unsigned structalign; // struct member alignment in effect int hasUnions; // set if aggregate has overlapping fields Array fields; // VarDeclaration fields unsigned sizeok; // set when structsize contains valid data // 0: no size // 1: size is correct // 2: cannot determine size; fwd referenced int isdeprecated; // !=0 if deprecated Scope *scope; // !=NULL means context to use // Special member functions InvariantDeclaration *inv; // invariant NewDeclaration *aggNew; // allocator DeleteDeclaration *aggDelete; // deallocator FuncDeclarations dtors; // Array of destructors FuncDeclaration *dtor; // aggregate destructor #ifdef IN_GCC Array methods; // flat list of all methods for debug information #endif AggregateDeclaration(Loc loc, Identifier *id); void semantic2(Scope *sc); void semantic3(Scope *sc); void inlineScan(); unsigned size(Loc loc); static void alignmember(unsigned salign, unsigned size, unsigned *poffset); Type *getType(); void addField(Scope *sc, VarDeclaration *v); int isDeprecated(); // is aggregate deprecated? FuncDeclaration *buildDtor(Scope *sc); void emitComment(Scope *sc); void toDocBuffer(OutBuffer *buf); // For access checking virtual PROT getAccess(Dsymbol *smember); // determine access to smember int isFriendOf(AggregateDeclaration *cd); int hasPrivateAccess(Dsymbol *smember); // does smember have private access to members of this class? void accessCheck(Loc loc, Scope *sc, Dsymbol *smember); enum PROT prot(); // Back end Symbol *stag; // tag symbol for debug data Symbol *sinit; Symbol *toInitializer(); AggregateDeclaration *isAggregateDeclaration() { return this; } }; struct AnonymousAggregateDeclaration : AggregateDeclaration { AnonymousAggregateDeclaration() : AggregateDeclaration(0, NULL) { } AnonymousAggregateDeclaration *isAnonymousAggregateDeclaration() { return this; } }; struct StructDeclaration : AggregateDeclaration { int zeroInit; // !=0 if initialize with 0 fill #if DMDV2 int hasIdentityAssign; // !=0 if has identity opAssign FuncDeclaration *cpctor; // generated copy-constructor, if any FuncDeclarations postblits; // Array of postblit functions FuncDeclaration *postblit; // aggregate postblit #endif StructDeclaration(Loc loc, Identifier *id); Dsymbol *syntaxCopy(Dsymbol *s); void semantic(Scope *sc); void toCBuffer(OutBuffer *buf, HdrGenState *hgs); char *mangle(); const char *kind(); Expression *cloneMembers(); void toDocBuffer(OutBuffer *buf); PROT getAccess(Dsymbol *smember); // determine access to smember void toObjFile(int multiobj); // compile to .obj file void toDt(dt_t **pdt); void toDebug(); // to symbolic debug info StructDeclaration *isStructDeclaration() { return this; } }; struct UnionDeclaration : StructDeclaration { UnionDeclaration(Loc loc, Identifier *id); Dsymbol *syntaxCopy(Dsymbol *s); const char *kind(); UnionDeclaration *isUnionDeclaration() { return this; } }; // warning: two classes with the same base class share the same // BaseClass instance. struct BaseClass { Type *type; // (before semantic processing) enum PROT protection; // protection for the base interface ClassDeclaration *base; int offset; // 'this' pointer offset Array vtbl; // for interfaces: Array of FuncDeclaration's // making up the vtbl[] int baseInterfaces_dim; BaseClass *baseInterfaces; // if BaseClass is an interface, these // are a copy of the InterfaceDeclaration::interfaces BaseClass(); BaseClass(Type *type, enum PROT protection); int fillVtbl(ClassDeclaration *cd, Array *vtbl, int newinstance); void copyBaseInterfaces(BaseClasses *); }; #if DMDV2 #define CLASSINFO_SIZE (0x3C+16) // value of ClassInfo.size #else #define CLASSINFO_SIZE (0x3C+12) // value of ClassInfo.size #endif struct ClassDeclaration : AggregateDeclaration { static ClassDeclaration *object; static ClassDeclaration *classinfo; ClassDeclaration *baseClass; // NULL only if this is Object CtorDeclaration *ctor; CtorDeclaration *defaultCtor; // default constructor FuncDeclaration *staticCtor; FuncDeclaration *staticDtor; Array vtbl; // Array of FuncDeclaration's making up the vtbl[] Array vtblFinal; // More FuncDeclaration's that aren't in vtbl[] BaseClasses baseclasses; // Array of BaseClass's; first is super, // rest are Interface's int interfaces_dim; BaseClass **interfaces; // interfaces[interfaces_dim] for this class // (does not include baseClass) BaseClasses *vtblInterfaces; // array of base interfaces that have // their own vtbl[] ClassInfoDeclaration *vclassinfo; // the ClassInfo object for this ClassDeclaration int com; // !=0 if this is a COM class (meaning // it derives from IUnknown) int isauto; // !=0 if this is an auto class int isabstract; // !=0 if abstract class int isnested; // !=0 if is nested VarDeclaration *vthis; // 'this' parameter if this class is nested int inuse; // to prevent recursive attempts ClassDeclaration(Loc loc, Identifier *id, BaseClasses *baseclasses); Dsymbol *syntaxCopy(Dsymbol *s); void semantic(Scope *sc); void toCBuffer(OutBuffer *buf, HdrGenState *hgs); int isBaseOf2(ClassDeclaration *cd); #define OFFSET_RUNTIME 0x76543210 virtual int isBaseOf(ClassDeclaration *cd, int *poffset); Dsymbol *search(Loc, Identifier *ident, int flags); #if DMDV2 int isFuncHidden(FuncDeclaration *fd); #endif FuncDeclaration *findFunc(Identifier *ident, TypeFunction *tf); void interfaceSemantic(Scope *sc); int isNested(); int isCOMclass(); virtual int isCOMinterface(); #if DMDV2 virtual int isCPPinterface(); #endif int isAbstract(); virtual int vtblOffset(); const char *kind(); char *mangle(); void toDocBuffer(OutBuffer *buf); PROT getAccess(Dsymbol *smember); // determine access to smember void addLocalClass(ClassDeclarations *); // Back end void toObjFile(int multiobj); // compile to .obj file void toDebug(); unsigned baseVtblOffset(BaseClass *bc); Symbol *toSymbol(); Symbol *toVtblSymbol(); void toDt(dt_t **pdt); void toDt2(dt_t **pdt, ClassDeclaration *cd); Symbol *vtblsym; ClassDeclaration *isClassDeclaration() { return (ClassDeclaration *)this; } }; struct InterfaceDeclaration : ClassDeclaration { #if DMDV2 int cpp; // !=0 if this is a C++ interface #endif InterfaceDeclaration(Loc loc, Identifier *id, BaseClasses *baseclasses); Dsymbol *syntaxCopy(Dsymbol *s); void semantic(Scope *sc); int isBaseOf(ClassDeclaration *cd, int *poffset); int isBaseOf(BaseClass *bc, int *poffset); const char *kind(); int vtblOffset(); #if DMDV2 int isCPPinterface(); #endif virtual int isCOMinterface(); void toObjFile(int multiobj); // compile to .obj file Symbol *toSymbol(); InterfaceDeclaration *isInterfaceDeclaration() { return this; } }; #endif /* DMD_AGGREGATE_H */