Lazy Strings In Guile (Debugging with ROCGDB)

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#### 24.4.3.20 Guile representation of lazy strings.

A lazy string is a string whose contents is not retrieved or encoded until it is needed.

A `<gdb:lazy-string>` is represented in ROCGDB as an `address` that points to a region of memory, an `encoding` that will be used to encode that region of memory, and a `length` to delimit the region of memory that represents the string. The difference between a `<gdb:lazy-string>` and a string wrapped within a `<gdb:value>` is that a `<gdb:lazy-string>` will be treated differently by ROCGDB when printing. A `<gdb:lazy-string>` is retrieved and encoded during printing, while a `<gdb:value>` wrapping a string is immediately retrieved and encoded on creation.

The following lazy-string-related procedures are provided by the `(gdb)` module:

Scheme Procedure: lazy-string? object

  Return `#t` if object is an object of type `<gdb:lazy-string>`. Otherwise return `#f`.

Scheme Procedure: lazy-string-address lazy-sring

  Return the address of lazy-string.

Scheme Procedure: lazy-string-length lazy-string

  Return the length of lazy-string in characters. If the length is -1, then the string will be fetched and encoded up to the first null of appropriate width.

Scheme Procedure: lazy-string-encoding lazy-string

  Return the encoding that will be applied to lazy-string when the string is printed by ROCGDB. If the encoding is not set, or contains an empty string, then ROCGDB will select the most appropriate encoding when the string is printed.

Scheme Procedure: lazy-string-type lazy-string

  Return the type that is represented by lazy-string’s type. For a lazy string this is a pointer or array type. To resolve this to the lazy string’s character type, use `type-target-type`. See Types In Guile.

Scheme Procedure: lazy-string->value lazy-string

  Convert the `<gdb:lazy-string>` to a `<gdb:value>`. This value will point to the string in memory, but will lose all the delayed retrieval, encoding and handling that ROCGDB applies to a `<gdb:lazy-string>`.

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