This commit fixes some warnings given by GCC 6.3.0.
* Some `assert(false)` are not recognized as `noreturn`ing. They have
been replaced with `llvm_unreachable`.
* Added `-Wno-ignored-attributes`: attributes are not part the function
name mangling, and therefore they might create some problems when they
are involved in template arguments. We don't care.
* Specializations of `readPointer` functions in `binaryfile.h` are now
`inline`, so they don't appear as "unused" functions.
Landing pads are basically the `catch` blocks in C++ `try`/`catch`
statements. So far we were missing them since they are encoded in a
particular way in a way similar to DWARF debugging information in the
`.eh_frame` and, more specifically, in the `.gcc_except_table` sections
of ELF programs.
This commit parses these sections so that the basic blocks associated to
landing pads are correctly identified. Personality functions are
detected too. A test is also introduced to assess the effectiveness of
our code.
This commit removes all the ELF-specific code from the `CodeGenerator`
class by creating a new class, `BinaryFile` which contains all the
information about the program that might be needed in an image format
independent way. However, `BinaryFile` has some fields which are
specific to ELF, we might want to address this when additional file
formats are supported.
A key benefit of isolating this code is that we can anticipate the
parsing of the input file, so that we have its architecture available
earlier than when `CodeGenerator` is instantiated, therefore we can drop
the `--architecture` parameter.
Alessandro Di Federico