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Add Python support for dynamic types

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This changes the gdb Python API to add support for dynamic types.  In
particular, this adds an attribute to gdb.Type, and updates some
attributes to reflect dynamic sizes and field offsets.

There's still no way to get the dynamic type from one of its concrete
instances.  This could perhaps be added if needed.

gdb/ChangeLog
2020-04-24  Tom Tromey  <tromey@adacore.com>

	PR python/23662:
	* python/py-type.c (convert_field): Handle
	FIELD_LOC_KIND_DWARF_BLOCK.
	(typy_get_sizeof): Handle TYPE_HAS_DYNAMIC_LENGTH.
	(typy_get_dynamic): Nw function.
	(type_object_getset): Add "dynamic".
	* NEWS: Add entry.

gdb/doc/ChangeLog
2020-04-24  Tom Tromey  <tromey@adacore.com>

	PR python/23662:
	* python.texi (Types In Python): Document new features.

gdb/testsuite/ChangeLog
2020-04-24  Tom Tromey  <tromey@adacore.com>

	PR python/23662:
	* gdb.ada/variant.exp: Add Python checks.
	* gdb.rust/simple.exp: Add dynamic type checks.
This commit is contained in:
Tom Tromey 2020-04-24 13:40:31 -06:00
parent adfb981595
commit 1acda8039b
8 changed files with 91 additions and 4 deletions
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14
gdb/doc/python.texi
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@ -1068,6 +1068,12 @@ The type code for this type. The type code will be one of the
@code{TYPE_CODE_} constants defined below.
@end defvar
@defvar Type.dynamic
A boolean indicating whether this type is dynamic. In some
situations, such as Rust @code{enum} types or Ada variant records, the
concrete type of a value may vary depending on its contents.
@end defvar
@defvar Type.name
The name of this type. If this type has no name, then @code{None}
is returned.
@ -1076,7 +1082,9 @@ is returned.
@defvar Type.sizeof
The size of this type, in target @code{char} units. Usually, a
target's @code{char} type will be an 8-bit byte. However, on some
unusual platforms, this type may have a different size.
unusual platforms, this type may have a different size. A dynamic
type may not have a fixed size; in this case, this attribute's value
will be @code{None}.
@end defvar
@defvar Type.tag
@ -1106,7 +1114,9 @@ Each field is a @code{gdb.Field} object, with some pre-defined attributes:
@item bitpos
This attribute is not available for @code{enum} or @code{static}
(as in C@t{++}) fields. The value is the position, counting
in bits, from the start of the containing type.
in bits, from the start of the containing type. Note that, in a
dynamic type, the position of a field may not be constant. In this
case, the value will be @code{None}.
@item enumval
This attribute is only available for @code{enum} fields, and its value