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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The virtual base classes are neither empty nor nearly empty.

Editorial changes in vtable components description. However, if the return value type has a non-trivial copy constructor or destructor, the caller allocates space for a temporary, and passes a pointer to the temporary as an implicit first parameter preceding both the this parameter and user parameters. Sets the first byte of the guard object abu a non-zero value. Except for the parentheses, therefore, it represents the source token stream.

Application binary interface

All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from November The bit convention on Windows Microsoft C has no leading underscore. Application binary interface ABI.

Other ABI aspects like exception handlingvirtual table layout, structure and stack frame paddingetc. This article is about name mangling in computer languages.

However, if an implementation emits such functions, it must use the external names specified in this ABI. The mangling of such unnamed types defined in namespace scope is generally unspecified because wbi do not have to match across translation units.

In the avi where the parameter type is class std:: Throughout this section, we assume that A is the class for which we are creating a virtual table, B is the most derived class in the hierarchy, and C is the class that contains C:: By using this site, you agree to the Terms of Use and Privacy Policy. Usage of the other bytes of the guard variable is implementation-defined.


Yet another try at the nested-name mangling grammar.

Sign up or log in Sign up using Google. Function types are composed from their parameter types and possibly the result type.

None of the above, i. There are two name-resolution concerns here, neither of which is implemented in a particularly standard manner:. The caller constructs the parameter in the space allocated, using a simple copy to the parameter space parameter registers or stack if there is no non-trivial copy constructor or destructor. To ensure that the virtual table pointers are set to the appropriate virtual tables during proper base class construction, a table of virtual table pointers, called the VTT, which holds the addresses of construction and non-construction virtual tables is generated for the complete class.

It also includes function calling interfaces, exception handling interfaces, global naming, and various object code conventions. Text beginning with ‘ ‘ is comments, to be ignored. Secondary virtual pointers may be required for base classes that do not require secondary VTTs.

A complete ABI, such as the Intel Binary Compatibility Standard iBCS[1] allows a program from one operating system supporting that ABI to run without modifications on any other such system, provided that necessary shared libraries are present, and similar prerequisites are fulfilled. The types of two non-static member functions are considered to be different, for the purposes of substitution, if the functions are members of different classes.

This adds the case: The pragma applies to all file scope variables in the file where it appears, from the point of appearance to the next priority pragma or the end of the file. The second destructor, called the itanoum destructor, calls delete after destroying the object. See the description of these terms in General above. When it is for a direct or indirect pointer to a member of an incomplete class type, the incomplete class type flag is set.


Otherwise, given the data address of an array, the non-negative size of prefix padding for the cookie, and the size of its elements, call the given destructor ianium each element, using the cookie to determine the number of elements, and then delete the space by calling:: September Learn how and when to remove this template message.

This includes struct layout and padding, and alignment requirements, so compiler B may rely on proper alignment from allocator A. First are the virtual tables of direct non-primary, non-virtual proper bases, in the order declared, including their itainum virtual tables for non-virtual bases in the order they appear in the standalone virtual table group for the base.

Just as normal virtual function override thunks must adjust the this pointer before calling the base function, those with covariant returns must adjust the return pointer after they return from the base function. Because the name-mangling systems for such features are not standardized across compilers, few linkers can link object code that was produced by different compilers.

Itanium C++ ABI

itanim If there is no non-trivial copy constructor or destructor, it is in the normal parameter-passing space, i. The discriminator is used only if there is more than one, for the second and subsequent ones. Further work on mangling, especially substitution.