Discussion and development of the “Itanium” portable C++ ABI used by many major C++ implementations. – Itanium C++ ABI. The Itanium ABI (which GCC uses) may specify these things (as within specifying ranges) Most types’ size and alignment is specified in the Intel System V ABI. Virtual Table Layout General A virtual table (vtable) is a table of information used to dispatch virtual functions, to ac.

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This function is called after initialization is complete.

For purposes of substitution see Compression belowdelimited and undelimited function types are considered the same. That is, the entry for the leftmost virtual base is closest to the address point of the virtual table.

Name mangling – Wikipedia

Similarly, an array type is not a POD for the purpose of layout if the element type of ktanium array is not a POD for the purpose of layout. This implies that the type information must keep a description of the public, unambiguous inheritance relationship of a type, as well as the const and volatile qualifications applied to types. This article needs additional citations for verification.

Further mangling requirements were imposed later in the evolution of the language because of the addition of modules and other features in the Fortran 90 standard. Tokens in square brackets “[]” are optional.

c++ – To what extent does the Itanium ABI really specify padding and alignment? – Stack Overflow

On Itanium, the associated NaT bit must not be set. The scope of anonymous classes is confined to their parent class, so the compiler must produce a “qualified” public name for the inner class, to avoid conflict where other classes with the same name inner or not exist in the same namespace. In particular, if the derived class overrides a base class virtual function with a different covariant return type, the entry for the derived class comes after the primary base’s embedded virtual table itznium declaration order, and is the entry used for calls from the derived class without adjustment.


Correct repeated inheritance flag description. Itanuum is good for safety purposes that compilers producing incompatible object codes codes based on different ABIs, regarding e. Call jtanium indirect primary base classes.

Application binary interface

Because of this, implementations of a method are given a specific identifier too — ai are known as implementation pointers, and are given a type also, IMP. All other destructors, including deleting destructors for classes with a virtual destructor, may assume that the this pointer is not NULL. The first is the constant adjustment to the nearest virtual base of the full objectof which the defining object is a non-virtual base. This section needs expansion. During the construction of a class object, the object abii the type of each of its proper base classes, as each base class subobject is constructed.

You need to follow the documentation to the standards incorporated by reference. If D is a possibly unnamed bitfield whose declared type is T and whose declared width is n bits: Sign up using Email and Password. Removing that requirement would not be a good idea, as there would then no longer be a itaniun to emit all thunks with the functions they jump to.


Itanium C++ ABI

The name member function returns the address of an NTBS, unique to the type, containing the mangled name of the type. An implementation shall place its standard support library in a DSO named libcxa. A NULL pointer is represented as There is one virtual base offset entry for each virtual base class, direct or indirect. An implementation must only ensure that naming collisions are avoided.

In cases where multiple order-insensitive qualifiers are present, they should be ordered ‘K’ closest to the base type’V’, ‘r’, and ‘U’ farthest from the base typewith the ‘U’ qualifiers in alphabetical order by the vendor name with alphabetically earlier names closer to the base type.

The mangled name of a guard variable is the name of the guarded variable prefixed with GV. Remove unnecessary RTTI wbi.

This article possibly contains original research. Non-terminals are delimited by diamond braces: An implementation must satisfy this constraint, e. A nonlocal scope is encoded as the qualifier of a abl name: After these two offsets comes the encoding of the target function. Each of the methods is assigned a unique symbol such as an integer.

In addition, reference is made to the separate description of exception handling in this ABI, itsnium defines a large number of runtime utility routine APIs.