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README.md
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@ -7,12 +7,14 @@ A local diffing tool for decompilation projects. Inspired by [decomp.me](https:/
Features:
- Compare entire object files: functions and data.
- Built-in symbol demangling for C++. (CodeWarrior, Itanium & MSVC)
- Automatic rebuild on source file changes.
- Project integration via [configuration file](#configuration).
- Search and filter all of a project's objects and quickly switch.
- Click to highlight all instances of values and registers.
- Compare entire object files: functions and data
- Built-in C++ symbol demangling (GCC, MSVC, CodeWarrior, Itanium)
- Automatic rebuild on source file changes
- Project integration via [configuration file](#configuration)
- Search and filter objects with quick switching
- Click-to-highlight values and registers
- Detailed progress reporting (powers [decomp.dev](https://decomp.dev))
- WebAssembly API, [web interface](https://github.com/encounter/objdiff-web) and [Visual Studio Code extension](https://marketplace.visualstudio.com/items?itemName=decomp-dev.objdiff) (WIP)
Supports:
@ -40,7 +42,7 @@ For Linux and macOS, run `chmod +x objdiff-*` to make the binary executable.
### CLI
CLI binaries can be found on the [releases page](https://github.com/encounter/objdiff/releases).
CLI binaries are available on the [releases page](https://github.com/encounter/objdiff/releases).
## Screenshots
@ -49,33 +51,30 @@ CLI binaries can be found on the [releases page](https://github.com/encounter/ob
## Usage
objdiff works by comparing two relocatable object files (`.o`). The objects are expected to have the same relative path
from the "target" and "base" directories.
objdiff compares two relocatable object files (`.o`). Here's how it works:
For example, if the target ("expected") object is located at `build/asm/MetroTRK/mslsupp.o` and the base ("actual")
object is located at `build/src/MetroTRK/mslsupp.o`, the following configuration would be used:
1. **Create an `objdiff.json` configuration file** in your project root (or generate it with your build script).
This file lists **all objects in the project** with their target ("expected") and base ("current") paths.
- Target build directory: `build/asm`
- Base build directory: `build/src`
- Object: `MetroTRK/mslsupp.o`
2. **Load the project** in objdiff.
objdiff will then execute the build system from the project directory to build both objects:
3. **Select an object** from the sidebar to begin diffing.
```sh
$ make build/asm/MetroTRK/mslsupp.o # Only if "Build target object" is enabled
$ make build/src/MetroTRK/mslsupp.o
```
4. **objdiff automatically:**
- Executes the build system to compile the base object (from current source code)
- Compares the two objects and displays the differences
- Watches for source file changes and rebuilds when detected
The objects will then be compared and the results will be displayed in the UI.
The configuration file allows complete flexibility in project structure - your build directories can have any layout as long as the paths are specified correctly.
See [Configuration](#configuration) for more information.
See [Configuration](#configuration) for setup details.
## Configuration
While **not required** (most settings can be specified in the UI), projects can add an `objdiff.json` file to configure the tool automatically. The configuration file must be located in
Projects can add an `objdiff.json` file to configure the tool automatically. The configuration file must be located in
the root project directory.
If your project has a generator script (e.g. `configure.py`), it's recommended to generate the objdiff configuration
If your project has a generator script (e.g. `configure.py`), it's highly recommended to generate the objdiff configuration
file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it from being committed.
```json
@ -128,78 +127,69 @@ file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it
### Schema
View [config.schema.json](config.schema.json) for all available options. The below list is a summary of the most important options.
> [!NOTE]
> View [config.schema.json](config.schema.json) for all available options. Below is a summary of the most important options.
`custom_make` _(optional)_: By default, objdiff will use `make` to build the project.
If the project uses a different build system (e.g. `ninja`), specify it here.
The build command will be `[custom_make] [custom_args] path/to/object.o`.
#### Build Configuration
`custom_args` _(optional)_: Additional arguments to pass to the build command prior to the object path.
**`custom_make`** _(optional, default: `"make"`)_
If the project uses a different build system (e.g. `ninja`), specify it here. The build command will be `[custom_make] [custom_args] path/to/object.o`.
`build_target`: If true, objdiff will tell the build system to build the target objects before diffing (e.g.
`make path/to/target.o`).
This is useful if the target objects are not built by default or can change based on project configuration or edits
to assembly files.
Requires the build system to be configured properly.
**`custom_args`** _(optional)_
Additional arguments to pass to the build command prior to the object path.
`build_base`: If true, objdiff will tell the build system to build the base objects before diffing (e.g. `make path/to/base.o`).
It's unlikely you'll want to disable this, unless you're using an external tool to rebuild the base object on source file changes.
**`build_target`** _(default: `false`)_
If true, objdiff will build the target objects before diffing (e.g. `make path/to/target.o`). Useful if target objects are not built by default or can change based on project configuration. Requires proper build system configuration.
`watch_patterns` _(optional)_: A list of glob patterns to watch for changes.
([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))
If any of these files change, objdiff will automatically rebuild the objects and re-compare them.
If not specified, objdiff will use the default patterns listed above.
**`build_base`** _(default: `true`)_
If true, objdiff will build the base objects before diffing (e.g. `make path/to/base.o`). It's unlikely you'll want to disable this unless using an external tool to rebuild the base object.
`ignore_patterns` _(optional)_: A list of glob patterns to explicitly ignore when watching for changes.
([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))
If not specified, objdiff will use the default patterns listed above.
#### File Watching
`units` _(optional)_: If specified, objdiff will display a list of objects in the sidebar for easy navigation.
**`watch_patterns`** _(optional, default: listed above)_
A list of glob patterns to watch for changes ([supported syntax](https://docs.rs/globset/latest/globset/#syntax)). When these files change, objdiff automatically rebuilds and re-compares objects.
> `name` _(optional)_: The name of the object in the UI. If not specified, the object's `path` will be used.
>
> `target_path`: Path to the "target" or "expected" object from the project root.
> This object is the **intended result** of the match.
>
> `base_path`: Path to the "base" or "actual" object from the project root.
> This object is built from the **current source code**.
>
> `metadata.auto_generated` _(optional)_: Hides the object from the object list, but still includes it in reports.
>
> `metadata.complete` _(optional)_: Marks the object as "complete" (or "linked") in the object list.
> This is useful for marking objects that are fully decompiled. A value of `false` will mark the object as "incomplete".
**`ignore_patterns`** _(optional, default: listed above)_
A list of glob patterns to explicitly ignore when watching for changes ([supported syntax](https://docs.rs/globset/latest/globset/#syntax)).
#### Units (Objects)
**`units`** _(optional)_
If specified, objdiff displays a list of objects in the sidebar for easy navigation. Each unit contains:
- **`name`** _(optional)_ - The display name in the UI. Defaults to the object's `path`.
- **`target_path`** _(optional)_ - Path to the "target" or "expected" object (the **intended result**).
- **`base_path`** _(optional)_ - Path to the "base" or "current" object (built from **current source code**). Omit if there is no source object yet.
- **`metadata.auto_generated`** _(optional)_ - Hides the object from the sidebar but includes it in progress reports.
- **`metadata.complete`** _(optional)_ - Marks the object as "complete" (linked) when `true` or "incomplete" when `false`.
## Building
Install Rust via [rustup](https://rustup.rs).
```shell
$ git clone https://github.com/encounter/objdiff.git
$ cd objdiff
$ cargo run --release
git clone https://github.com/encounter/objdiff.git
cd objdiff
cargo run --release
```
Or using `cargo install`.
Or install directly with cargo:
```shell
$ cargo install --locked --git https://github.com/encounter/objdiff.git objdiff-gui objdiff-cli
cargo install --locked --git https://github.com/encounter/objdiff.git objdiff-gui objdiff-cli
```
The binaries will be installed to `~/.cargo/bin` as `objdiff` and `objdiff-cli`.
Binaries will be installed to `~/.cargo/bin` as `objdiff` and `objdiff-cli`.
## Installing `pre-commit`
## Contributing
When contributing, it's recommended to install `pre-commit` to automatically run the linter and formatter before a commit.
[`uv`](https://github.com/astral-sh/uv#installation) is recommended to manage Python version and tools.
Rust nightly is required for `cargo +nightly fmt` and `cargo +nightly clippy`.
Install `pre-commit` to run linting and formatting automatically:
```shell
$ cargo install --locked cargo-deny
$ rustup toolchain install nightly
$ uv tool install pre-commit
$ pre-commit install
rustup toolchain install nightly # Required for cargo fmt/clippy
cargo install --locked cargo-deny # https://github.com/EmbarkStudios/cargo-deny
uv tool install pre-commit # https://docs.astral.sh/uv, or use pipx or pip
pre-commit install
```
## License

20
config.schema.json
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@ -15,7 +15,7 @@
},
"custom_make": {
"type": "string",
"description": "By default, objdiff will use make to build the project.\nIf the project uses a different build system (e.g. ninja), specify it here.\nThe build command will be `[custom_make] [custom_args] path/to/object.o`.",
"description": "If the project uses a different build system (e.g. ninja), specify it here.\nThe build command will be `[custom_make] [custom_args] path/to/object.o`.",
"examples": [
"make",
"ninja"
@ -41,17 +41,17 @@
},
"build_target": {
"type": "boolean",
"description": "If true, objdiff will tell the build system to build the target objects before diffing (e.g. `make path/to/target.o`).\nThis is useful if the target objects are not built by default or can change based on project configuration or edits to assembly files.\nRequires the build system to be configured properly.",
"description": "If true, objdiff will build the target objects before diffing (e.g. `make path/to/target.o`).\nUseful if target objects are not built by default or can change based on project configuration.\nRequires proper build system configuration.",
"default": false
},
"build_base": {
"type": "boolean",
"description": "If true, objdiff will tell the build system to build the base objects before diffing (e.g. `make path/to/base.o`).\nIt's unlikely you'll want to disable this, unless you're using an external tool to rebuild the base object on source file changes.",
"description": "If true, objdiff will build the base objects before diffing (e.g. `make path/to/base.o`).\nIt's unlikely you'll want to disable this unless using an external tool to rebuild the base object.",
"default": true
},
"watch_patterns": {
"type": "array",
"description": "List of glob patterns to watch for changes in the project.\nIf any of these files change, objdiff will automatically rebuild the objects and re-compare them.\nSupported syntax: https://docs.rs/globset/latest/globset/#syntax",
"description": "A list of glob patterns to watch for changes.\nWhen these files change, objdiff automatically rebuilds and re-compares objects.\nSupported syntax: https://docs.rs/globset/latest/globset/#syntax",
"items": {
"type": "string"
},
@ -82,7 +82,7 @@
},
"ignore_patterns": {
"type": "array",
"description": "List of glob patterns to explicitly ignore when watching for changes.\nFiles matching these patterns will not trigger a rebuild.\nSupported syntax: https://docs.rs/globset/latest/globset/#syntax",
"description": "A list of glob patterns to explicitly ignore when watching for changes.\nSupported syntax: https://docs.rs/globset/latest/globset/#syntax",
"items": {
"type": "string"
},
@ -119,7 +119,7 @@
"properties": {
"name": {
"type": "string",
"description": "The name of the object in the UI. If not specified, the object's path will be used."
"description": "The display name in the UI. Defaults to the object's path."
},
"path": {
"type": "string",
@ -128,11 +128,11 @@
},
"target_path": {
"type": "string",
"description": "Path to the target object from the project root.\nRequired if path is not specified."
"description": "Path to the \"target\" or \"expected\" object (the intended result)."
},
"base_path": {
"type": "string",
"description": "Path to the base object from the project root.\nRequired if path is not specified."
"description": "Path to the \"base\" or \"current\" object (built from current source code).\nOmit if there is no source object yet."
},
"reverse_fn_order": {
"type": "boolean",
@ -207,7 +207,7 @@
"properties": {
"complete": {
"type": "boolean",
"description": "Marks the object as \"complete\" (or \"linked\") in the object list.\nThis is useful for marking objects that are fully decompiled. A value of `false` will mark the object as \"incomplete\"."
"description": "Marks the object as \"complete\" (linked) when `true` or \"incomplete\" when `false`."
},
"reverse_fn_order": {
"type": "boolean",
@ -227,7 +227,7 @@
},
"auto_generated": {
"type": "boolean",
"description": "Hides the object from the object list by default, but still includes it in reports."
"description": "Hides the object from the sidebar but includes it in progress reports."
}
}
},