Commit Graph

4 Commits

Author SHA1 Message Date
Omar Sandoval
8b264f8823 Update copyright headers to Facebook and add missing headers
drgn was originally my side project, but for awhile now it's also been
my work project. Update the copyright headers to reflect this, and add a
copyright header to various files that were missing it.
2020-05-15 15:13:02 -07:00
Omar Sandoval
0c5df56fba libdrgn: replace symbol index with object index
struct drgn_symbol doesn't really represent a symbol; it's just an
object which hasn't been fully initialized (see c2be52dff0 ("libdrgn:
rename object index to symbol index"), it used to be called a "partial
object"). For stack traces, we're going to have a notion of a symbol
that more closely represents an ELF symbol, so let's get rid of the
temporary struct drgn_symbol representation and just return an object
directly.
2019-07-29 17:04:47 -07:00
Omar Sandoval
c2be52dff0 libdrgn: rename object index to symbol index
An "object index" doesn't actually index objects, but really "partial
objects" -- i.e., a type + address. "Symbol" is a better name for this.
2019-05-06 14:55:34 -07:00
Omar Sandoval
75c3679147 Rewrite drgn core in C
The current mixed Python/C implementation works well, but it has a
couple of important limitations:

- It's too slow for some common use cases, like iterating over large
  data structures.
- It can't be reused in utilities written in other languages.

This replaces the internals with a new library written in C, libdrgn. It
includes Python bindings with mostly the same public interface as
before, with some important improvements:

- Types are now represented by a single Type class rather than the messy
  polymorphism in the Python implementation.
- Qualifiers are a bitmask instead of a set of strings.
- Bit fields are not considered a separate type.
- The lvalue/rvalue terminology is replaced with reference/value.
- Structure, union, and array values are better supported.
- Function objects are supported.
- Program distinguishes between lookups of variables, constants, and
  functions.

The C rewrite is about 6x as fast as the original Python when using the
Python bindings, and about 8x when using the C API directly.

Currently, the exposed API in C is fairly conservative. In the future,
the memory reader, type index, and object index APIs will probably be
exposed for more flexibility.
2019-04-02 14:12:07 -07:00