Andrew Burgess 15e15b2d9c gdb/python: implement the print_insn extension language hook ... This commit extends the Python API to include disassembler support. The motivation for this commit was to provide an API by which the user could write Python scripts that would augment the output of the disassembler. To achieve this I have followed the model of the existing libopcodes disassembler, that is, instructions are disassembled one by one. This does restrict the type of things that it is possible to do from a Python script, i.e. all additional output has to fit on a single line, but this was all I needed, and creating something more complex would, I think, require greater changes to how GDB's internal disassembler operates. The disassembler API is contained in the new gdb.disassembler module, which defines the following classes: DisassembleInfo Similar to libopcodes disassemble_info structure, has read-only properties: address, architecture, and progspace. And has methods: __init__, read_memory, and is_valid. Each time GDB wants an instruction disassembled, an instance of this class is passed to a user written disassembler function, by reading the properties, and calling the methods (and other support methods in the gdb.disassembler module) the user can perform and return the disassembly. Disassembler This is a base-class which user written disassemblers should inherit from. This base class provides base implementations of __init__ and __call__ which the user written disassembler should override. DisassemblerResult This class can be used to hold the result of a call to the disassembler, it's really just a wrapper around a string (the text of the disassembled instruction) and a length (in bytes). The user can return an instance of this class from Disassembler.__call__ to represent the newly disassembled instruction. The gdb.disassembler module also provides the following functions: register_disassembler This function registers an instance of a Disassembler sub-class as a disassembler, either for one specific architecture, or, as a global disassembler for all architectures. builtin_disassemble This provides access to GDB's builtin disassembler. A common use case that I see is augmenting the existing disassembler output. The user code can call this function to have GDB disassemble the instruction in the normal way. The user gets back a DisassemblerResult object, which they can then read in order to augment the disassembler output in any way they wish. This function also provides a mechanism to intercept the disassemblers reads of memory, thus the user can adjust what GDB sees when it is disassembling. The included documentation provides a more detailed description of the API. There is also a new CLI command added: maint info python-disassemblers This command is defined in the Python gdb.disassemblers module, and can be used to list the currently registered Python disassemblers.		2022-06-15 09:44:54 +01:00
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