yaxpeax-arch

yaxpeax-arch

shared traits for architecture definitions, instruction decoders, and related interfaces for instruction decoders from the yaxpeax project.

typically this crate is only interesting if you're writing code to operate on multiple architectures that all implement yaxpeax-arch traits. for example, yaxpeax-dis implements disassembly and display logic generic over the traits defined here, so adding a new decoder is usually only a one or two line addition.

yaxpeax-arch has several crate features, which implementers are encouraged to also support:

• std: opt-in for std-specific support - in this crate, std enables a std::error::Error requirement on DecodeError, allowing users to ?-unwrap decode results.
• color_new: enables traits and structs to stylize formatted instructions, including ANSI colorization.
• colors: DEPRECATED. enables (optional) crossterm-based ANSI colorization. default coloring rules are defined by ColorSettings, when enabled.
• address-parse: enable a requirement that yaxpeax_arch::Address be parsable from &str. this is useful for use cases that, for example, read addresses from humans.
• use-serde: enable serde serialization and deserialization bounds for types like Address.

with all features disabled, yaxpeax-arch's only direct dependency is num-traits, and is suitable for #![no_std] usage.

design

yaxpeax-arch has backwards-incompatible changes from time to time, but there's not much to make incompatible. the main benefit of this crate is the Arch trait, for other libraries to build architecture-agnostic functionality.

nontrivial additions to yaxpeax-arch should include some discussion summarized by an addition to the crate docs/. you may ask, "where does discussion happen?", and the answer currently is in my (iximeow's) head, or various discord/irc/discord/email conversations. if there's need in the future, yaxpeax may develop a more consistent process.

yaxpeax-arch intends to support ad-hoc development of architecture support. maintainers of various architectures' crates may not want to implement all available interfaces to a complete level of detail, and must not be required to. incomplete implementations may be an issue for downstream users, but library quality is mediated by human conversation, not yaxpeax-arch interfaces. extensions to these fundamental definitions should be considerate of partial and incomplete implementations.

implementations

there are numerous architectures for which decoders are implemented, at varying levels of completion. now and in the future, they will be enumerated here:

feature support

yaxpeax-arch defines a few typically-optional features that decoders can also implement, in addition to simple (bytes) -> instruction decoding. these are yaxpeax-arch traits (or collections thereof) which architectures implement, not crate features.

description_spans: implementation of AnnotatingDecoder, to decode instructions with bit-level details of what incoming bitstreams mean. contextualize: implementation of ShowContextual, to display instructions with user-defined information in place of default instruction data. typically expected to show label names instead of relative branch addresses. i do not recommend implementing this trait, it needs significant reconsideration.

mirrors

the canonical copy of yaxpeax-arch is at https://git.iximeow.net/yaxpeax-arch.

yaxpeax-arch is also mirrored on GitHub at https://www.github.com/iximeow/yaxpeax-arch.