In computer science, a tagged pointer is a pointer (concretely a memory address) with additional data associated with it, such as an indirection bit or reference count. This additional data is often "folded" into the pointer, meaning stored inline in the data representing the address, taking advantage of certain properties of memory addressing. The name comes from "tagged architecture" systems, which reserved bits at the hardware level to indicate the significance of each word; the additional data is called a "tag" or "tags", though strictly speaking "tag" refers to data specifying a type, not other data; however, the usage "tagged pointer" is ubiquitous.
In computer science, a taggedpointer is a pointer (concretely a memory address) with additional data associated with it, such as an indirection bit or...
indirection bit, and other kinds of taggedpointers, are usually implemented using some sort of tagged union. A tagged union can be seen as the simplest...
possibly null pointer can be seen as a taggedpointer with a computed tag. Programming languages use different literals for the null pointer. In Python,...
correct meaning. Notable examples of American tagged architectures were the Lisp machines, which had taggedpointer support at the hardware and opcode level...
Such tagged state references are also used in transactional memory. Although a taggedpointer can be used for implementation, a separate tag field is...
whether it is a primitive value. One common solution is the use of taggedpointers. The garbage collector can reclaim only objects that have no references...
inefficiency in software by the use of taggedpointers, which allow a pointer in a final position to be specifically tagged as such, but is best done in hardware...
each variable, type, procedure, etc. A DIE has a tag (e.g., DW_TAG_variable, DW_TAG_pointer_type, DW_TAG_subprogram) and attributes (key-value pairs). A...
editable pointer to a function (such as for the purpose of returning an allocated array to the calling code) you have to pass a pointer to that pointer: its...
white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can...
and the resulting pointer is a taggedpointer, the indirection bit tagging whether it is a direct pointer or an indirect pointer. Care is needed to ensure...
Bounds-checking elimination Smart pointerTaggedpointer Reese, Richard (2013). Understanding and Using C Pointers: Core Techniques for Memory Management...
of memory, or fat pointers, which contain both the pointer and additional data, describing the region that they point to. Tagging is a compiler-based...
used to define a new pointer type. typedef int *intptr; intptr ptr; // Same as: // int *ptr; intptr is a new alias with the pointer type int *. The definition...
A64: Has 31 general-purpose 64-bit registers. Has dedicated zero or stack pointer (SP) register (depending on instruction). The program counter (PC) is no...
Māori: /ˈmaːko/; Isurus oxyrinchus), also known as the shortfin mako, blue pointer, or bonito shark, is a large mackerel shark. It is commonly referred to...
downloaded a web page. As the user could still interact with the program, the pointer remained normal (and not a busy symbol, such as an hourglass); therefore...
unaware that their photos are tagged by default in this manner, or that specialist software may be required to remove the Exif tag before publishing. For example...
type-tagged and immediate data types and the garbage collector would rely on knowing that one half of the CPU registers could only hold tagged types...
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