mirror of https://github.com/encounter/objdiff.git
144 lines
5.3 KiB
Markdown
144 lines
5.3 KiB
Markdown
# objdiff [![Build Status]][actions]
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[Build Status]: https://github.com/encounter/objdiff/actions/workflows/build.yaml/badge.svg
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[actions]: https://github.com/encounter/objdiff/actions
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A local diffing tool for decompilation projects. Inspired by [decomp.me](https://decomp.me) and [asm-differ](https://github.com/simonlindholm/asm-differ).
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Features:
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- Compare entire object files: functions and data.
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- Built-in symbol demangling for C++.
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- Automatic rebuild on source file changes.
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- Project integration via [configuration file](#configuration).
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- Search and filter all of a project's objects and quickly switch.
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- Click to highlight all instances of values and registers.
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Supports:
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- PowerPC 750CL (GameCube & Wii)
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- MIPS (Nintendo 64)
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See [Usage](#usage) for more information.
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## Usage
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objdiff works by comparing two relocatable object files (`.o`). The objects are expected to have the same relative path
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from the "target" and "base" directories.
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For example, if the target ("expected") object is located at `build/asm/MetroTRK/mslsupp.o` and the base ("actual")
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object is located at `build/src/MetroTRK/mslsupp.o`, the following configuration would be used:
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- Target build directory: `build/asm`
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- Base build directory: `build/src`
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- Object: `MetroTRK/mslsupp.o`
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objdiff will then execute the build system from the project directory to build both objects:
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```sh
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$ make build/asm/MetroTRK/mslsupp.o # Only if "Build target object" is enabled
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$ make build/src/MetroTRK/mslsupp.o
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```
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The objects will then be compared and the results will be displayed in the UI.
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See [Configuration](#configuration) for more information.
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## Configuration
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While **not required** (most settings can be specified in the UI), projects can add an `objdiff.json` (or
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`objdiff.yaml`, `objdiff.yml`) file to configure the tool automatically. The configuration file must be located in
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the root project directory.
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If your project has a generator script (e.g. `configure.py`), it's recommended to generate the objdiff configuration
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file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it from being committed.
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```json5
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// objdiff.json
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{
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"custom_make": "ninja",
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// Only required if objects use "path" instead of "target_path" and "base_path".
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"target_dir": "build/asm",
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"base_dir": "build/src",
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"build_target": true,
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"watch_patterns": [
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"*.c",
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"*.cp",
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"*.cpp",
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"*.h",
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"*.hpp",
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"*.py"
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],
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"objects": [
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{
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"name": "main/MetroTRK/mslsupp",
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// Option 1: Relative to target_dir and base_dir
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"path": "MetroTRK/mslsupp.o",
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// Option 2: Explicit paths from project root
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// Useful for more complex directory layouts
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"target_path": "build/asm/MetroTRK/mslsupp.o",
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"base_path": "build/src/MetroTRK/mslsupp.o",
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"reverse_fn_order": false
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},
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// ...
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]
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}
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```
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`custom_make` _(optional)_: By default, objdiff will use `make` to build the project.
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If the project uses a different build system (e.g. `ninja`), specify it here.
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`target_dir` _(optional)_: Relative from the root of the project, this where the "target" or "expected" objects are located.
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These are the **intended result** of the match.
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`base_dir` _(optional)_: Relative from the root of the project, this is where the "base" or "actual" objects are located.
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These are objects built from the **current source code**.
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`build_target`: If true, objdiff will tell the build system to build the target objects before diffing (e.g.
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`make path/to/target.o`).
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This is useful if the target objects are not built by default or can change based on project configuration or edits
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to assembly files.
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Requires the build system to be configured properly.
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`watch_patterns` _(optional)_: A list of glob patterns to watch for changes.
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([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))
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If any of these files change, objdiff will automatically rebuild the objects and re-compare them.
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If not specified, objdiff will use the default patterns listed above.
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`objects` _(optional)_: If specified, objdiff will display a list of objects in the sidebar for easy navigation.
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> `name` _(optional)_: The name of the object in the UI. If not specified, the object's `path` will be used.
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>
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> `path`: Relative path to the object from the `target_dir` and `base_dir`.
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> Requires `target_dir` and `base_dir` to be specified.
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>
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> `target_path`: Path to the target object from the project root.
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> Required if `path` is not specified.
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>
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> `base_path`: Path to the base object from the project root.
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> Required if `path` is not specified.
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>
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> `reverse_fn_order` _(optional)_: Displays function symbols in reversed order.
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Used to support MWCC's `-inline deferred` option, which reverses the order of functions in the object file.
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## License
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Licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as
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defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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