• Added encoding functionality, allowing users to use Zydis for code generation and rewriting
  • A huge thanks goes to @mappzor, who contributed pretty much the entire implementation by himself
• Split instruction and operand decoding, allowing users to decode only the data they actually need
• Added support for creating amalgamized builds, essentially combining all of Zydis and the required Zycore source code files and headers into a single header and source file, greatly simplifying linking against Zydis on the quick
• Improved and automatically built documentation for all recent versions of Zydis
• Added maximally simplified all-in-one disassembler function (see #379 for details)

Check out our corresponding blog article for details and examples!

Porting Guide

We offer a porting guide for the breaking changes from v3 to v4.

Important Changes

Decoder

• Fix general address-width handling by @flobernd in #238
• Fix register constraints of certain AMX instructions by @flobernd in #271
• Fixed constraint enforcement for AMX instructions by @mappzor in #276
• Decouple operand decoding by @flobernd in #278
• Remove deprecated accessed_flags flags field from ZydisDecodedInstruction by @flobernd in #262
• Add unions in decoded instruction and operands by @athre0z in #326
• Declare structs as anonymous within anonymous unions by @ZehMatt in #329
• Change st0 operand visibility as specified by SDM by @athre0z in #331
• Improved signedness data accuracy and consistency (Fixes #327) by @mappzor in #336

Encoder

• Implemented instruction encoder by @mappzor in #254
• Added ZydisEncoderNopFill by @mappzor in #376
• Added function to calculate and encode relative operands by @mappzor in #368

Build

• Add option to use system installed Zycore by @Tachi107 in #250
• Fix build on macOS 12 by @athre0z in #259
• Get rid of ZydisExportConfig.h by @athre0z in #301
• Add script for generating an amalgamated distribution by @athre0z in #302
• Add WebAssembly support by @williballenthin in #277
• Improve LTO support by @athre0z in #333
• Add Makefile for quick access to various operations by @athre0z in #346

Misc

• Zycore: updated to v1.4.1
• Utils: remove ZydisPE by @athre0z in #257
• Docs: add man pages by @Tachi107 in #267
• Registers: add lookup tables for ZydisRegister and ZydisRegisterClass by @flobernd in #283
• Tools: improve ZydisInfo by @flobernd in #285
• Formatter: fix MASM style disassembly by @flobernd in #298
• Segments: move segment functions into a separate, optional header by @athre0z in #348
• Formatter: simplify formatter interface by @athre0z in #361
• Doc: switch Doxygen theme by @athre0z in #373
• CI: add automated documentation builds by @athre0z in #374

Full Changelog: v3.2.1...v4.0.0