mirror of
https://github.com/classilla/tenfourfox.git
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238 lines
8.8 KiB
C++
238 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* XPTI_PUBLIC_API and XPTI_GetInterfaceInfoManager declarations. */
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#ifndef xptiinfo_h___
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#define xptiinfo_h___
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#include "nscore.h"
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#include "xpt_struct.h"
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// Flyweight wrapper classes for xpt_struct.h structs.
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// Everything here is dependent upon - and sensitive to changes in -
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// xpcom/typelib/xpt/xpt_struct.h!
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class nsXPTType : public XPTTypeDescriptorPrefix
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{
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// NO DATA - this a flyweight wrapper
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public:
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nsXPTType()
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{} // random contents
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MOZ_IMPLICIT nsXPTType(const XPTTypeDescriptorPrefix& prefix)
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{*(XPTTypeDescriptorPrefix*)this = prefix;}
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MOZ_IMPLICIT nsXPTType(const uint8_t& prefix)
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{*(uint8_t*)this = prefix;}
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nsXPTType& operator=(uint8_t val)
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{flags = val; return *this;}
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nsXPTType& operator=(const nsXPTType& other)
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{flags = other.flags; return *this;}
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operator uint8_t() const
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{return flags;}
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// 'Arithmetic' here roughly means that the value is self-contained and
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// doesn't depend on anything else in memory (ie: not a pointer, not an
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// XPCOM object, not a jsval, etc).
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//
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// Supposedly this terminology comes from Harbison/Steele, but it's still
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// a rather crappy name. We'd change it if it wasn't used all over the
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// place in xptcall. :-(
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bool IsArithmetic() const
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{return flags <= T_WCHAR;}
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// We used to abuse 'pointer' flag bit in typelib format quite extensively.
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// We've gotten rid of most of the cases, but there's still a fair amount
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// of refactoring to be done in XPCWrappedJSClass before we can safely stop
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// asking about this. In the mean time, we've got a temporary version of
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// IsPointer() that should be equivalent to what's in the typelib.
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bool deprecated_IsPointer() const
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{return !IsArithmetic() && TagPart() != T_JSVAL;}
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bool IsInterfacePointer() const
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{ switch (TagPart()) {
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default:
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return false;
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case T_INTERFACE:
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case T_INTERFACE_IS:
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return true;
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}
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}
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bool IsArray() const
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{return TagPart() == T_ARRAY;}
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// 'Dependent' means that params of this type are dependent upon other
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// params. e.g. an T_INTERFACE_IS is dependent upon some other param at
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// runtime to say what the interface type of this param really is.
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bool IsDependent() const
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{ switch (TagPart()) {
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default:
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return false;
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case T_INTERFACE_IS:
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case TD_ARRAY:
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case T_PSTRING_SIZE_IS:
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case T_PWSTRING_SIZE_IS:
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return true;
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}
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}
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uint8_t TagPart() const
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{return (uint8_t) (flags & XPT_TDP_TAGMASK);}
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enum
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{
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T_I8 = TD_INT8 ,
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T_I16 = TD_INT16 ,
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T_I32 = TD_INT32 ,
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T_I64 = TD_INT64 ,
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T_U8 = TD_UINT8 ,
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T_U16 = TD_UINT16 ,
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T_U32 = TD_UINT32 ,
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T_U64 = TD_UINT64 ,
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T_FLOAT = TD_FLOAT ,
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T_DOUBLE = TD_DOUBLE ,
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T_BOOL = TD_BOOL ,
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T_CHAR = TD_CHAR ,
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T_WCHAR = TD_WCHAR ,
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T_VOID = TD_VOID ,
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T_IID = TD_PNSIID ,
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T_DOMSTRING = TD_DOMSTRING ,
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T_CHAR_STR = TD_PSTRING ,
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T_WCHAR_STR = TD_PWSTRING ,
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T_INTERFACE = TD_INTERFACE_TYPE ,
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T_INTERFACE_IS = TD_INTERFACE_IS_TYPE,
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T_ARRAY = TD_ARRAY ,
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T_PSTRING_SIZE_IS = TD_PSTRING_SIZE_IS ,
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T_PWSTRING_SIZE_IS = TD_PWSTRING_SIZE_IS ,
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T_UTF8STRING = TD_UTF8STRING ,
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T_CSTRING = TD_CSTRING ,
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T_ASTRING = TD_ASTRING ,
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T_JSVAL = TD_JSVAL
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};
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// NO DATA - this a flyweight wrapper
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};
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class nsXPTParamInfo : public XPTParamDescriptor
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{
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// NO DATA - this a flyweight wrapper
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public:
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MOZ_IMPLICIT nsXPTParamInfo(const XPTParamDescriptor& desc)
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{*(XPTParamDescriptor*)this = desc;}
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bool IsIn() const {return 0 != (XPT_PD_IS_IN(flags));}
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bool IsOut() const {return 0 != (XPT_PD_IS_OUT(flags));}
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bool IsRetval() const {return 0 != (XPT_PD_IS_RETVAL(flags));}
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bool IsShared() const {return 0 != (XPT_PD_IS_SHARED(flags));}
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// Dipper types are one of the more inscrutable aspects of xpidl. In a
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// nutshell, dippers are empty container objects, created and passed by
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// the caller, and filled by the callee. The callee receives a fully-
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// formed object, and thus does not have to construct anything. But
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// the object is functionally empty, and the callee is responsible for
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// putting something useful inside of it.
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//
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// XPIDL decides which types to make dippers. The list of these types
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// is given in the isDipperType() function in typelib.py, and is currently
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// limited to 4 string types.
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//
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// When a dipper type is declared as an 'out' parameter, xpidl internally
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// converts it to an 'in', and sets the XPT_PD_DIPPER flag on it. For this
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// reason, dipper types are sometimes referred to as 'out parameters
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// masquerading as in'. The burden of maintaining this illusion falls mostly
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// on XPConnect, which creates the empty containers, and harvest the results
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// after the call.
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bool IsDipper() const {return 0 != (XPT_PD_IS_DIPPER(flags));}
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bool IsOptional() const {return 0 != (XPT_PD_IS_OPTIONAL(flags));}
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const nsXPTType GetType() const {return type.prefix;}
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bool IsStringClass() const {
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switch (GetType().TagPart()) {
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case nsXPTType::T_ASTRING:
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case nsXPTType::T_DOMSTRING:
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case nsXPTType::T_UTF8STRING:
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case nsXPTType::T_CSTRING:
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return true;
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default:
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return false;
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}
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}
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// Whether this parameter is passed indirectly on the stack. This mainly
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// applies to out/inout params, but we use it unconditionally for certain
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// types.
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bool IsIndirect() const {return IsOut() ||
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GetType().TagPart() == nsXPTType::T_JSVAL;}
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// NOTE: other activities on types are done via methods on nsIInterfaceInfo
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private:
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nsXPTParamInfo(); // no implementation
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// NO DATA - this a flyweight wrapper
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};
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class nsXPTMethodInfo : public XPTMethodDescriptor
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{
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// NO DATA - this a flyweight wrapper
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public:
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MOZ_IMPLICIT nsXPTMethodInfo(const XPTMethodDescriptor& desc)
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{*(XPTMethodDescriptor*)this = desc;}
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bool IsGetter() const {return 0 != (XPT_MD_IS_GETTER(flags) );}
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bool IsSetter() const {return 0 != (XPT_MD_IS_SETTER(flags) );}
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bool IsNotXPCOM() const {return 0 != (XPT_MD_IS_NOTXPCOM(flags));}
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bool IsConstructor() const {return 0 != (XPT_MD_IS_CTOR(flags) );}
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bool IsHidden() const {return 0 != (XPT_MD_IS_HIDDEN(flags) );}
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bool WantsOptArgc() const {return 0 != (XPT_MD_WANTS_OPT_ARGC(flags));}
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bool WantsContext() const {return 0 != (XPT_MD_WANTS_CONTEXT(flags));}
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const char* GetName() const {return name;}
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uint8_t GetParamCount() const {return num_args;}
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/* idx was index before I got _sick_ of the warnings on Unix, sorry jband */
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const nsXPTParamInfo GetParam(uint8_t idx) const
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{
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NS_PRECONDITION(idx < GetParamCount(),"bad arg");
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return params[idx];
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}
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const nsXPTParamInfo GetResult() const
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{return result;}
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private:
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nsXPTMethodInfo(); // no implementation
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// NO DATA - this a flyweight wrapper
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};
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// forward declaration
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struct nsXPTCMiniVariant;
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class nsXPTConstant : public XPTConstDescriptor
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{
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// NO DATA - this a flyweight wrapper
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public:
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MOZ_IMPLICIT nsXPTConstant(const XPTConstDescriptor& desc)
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{*(XPTConstDescriptor*)this = desc;}
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const char* GetName() const
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{return name;}
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const nsXPTType GetType() const
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{return type.prefix;}
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// XXX this is ugly. But sometimes you gotta do what you gotta do.
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// A reinterpret_cast won't do the trick here. And this plain C cast
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// works correctly and is safe enough.
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// See http://bugzilla.mozilla.org/show_bug.cgi?id=49641
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const nsXPTCMiniVariant* GetValue() const
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{return (nsXPTCMiniVariant*) &value;}
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private:
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nsXPTConstant(); // no implementation
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// NO DATA - this a flyweight wrapper
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};
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#endif /* xptiinfo_h___ */
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