`MetaAddress` replaces all the `uint64_t` used to represent a virtual
address. Its main features are:
* It has a non-zero representation of invalid addresses.
* It supports tags to represent code that has different interpretations but
resides at the same address in memory (namely ARM vs Thumb).
* Arithmetic operations cannot overflow.
* It supports epochs, a way we intend to employ to handle self-modifying code
(i.e., different code at the same address at different times).
* It supports "address spaces", which enable handling architectures with
multiple address spaces.
* It fits in two 64-bit registers.
* Drop unused argument names from function prototypes
* Make `static` some methods
* Disable some copy constructors
* Fix casing of Doxygen `\file` directives
* Add some casts to make the compiler happy
* Initialize `hasRelocationAddend` for AArch64
* Use references in range-for where possible
* Drop default for `switch` statements covering all the entries of an `enum`
* Make some global variables `static`
* Drop dead functions
In `PTCDump.cpp` we were using `strncpy` in an invalid fashion: the `n`
argument was exactly the same size of the buffer, which might lead to a
missing NUL-terminator. This commit increases the buffer size by one
byte and initializes it with '\0'.
This bug was reported by `-Wstringop-truncation` of GCC 9.1.0 on a
Release build.
This commit does the following:
* It drops `revamb-dump` and transforms all the passes it featured in
passes that can be used directly from `opt`.
* It rename `revamb` to `revng-lift`.
* It introduces a script called `revng` which acts as a driver for the
whole rev.ng project. It replaces `translate`, `revcc`,
`csv-to-ld-options` and `revamb-dump`, since it offers an `opt`
subcommand which allows to easily invoke all the analysis passes.
* It makes the project a CMake package that can be easily used
externally.
* It allows to easily create libraries of analysis to use through
`revng-opt`.
Ivan Krysak