# SPIR-V Tools [![Build Status](https://travis-ci.org/KhronosGroup/SPIRV-Tools.svg?branch=master)](https://travis-ci.org/KhronosGroup/SPIRV-Tools) [![Build status](https://ci.appveyor.com/api/projects/status/gpue87cesrx3pi0d/branch/master?svg=true)](https://ci.appveyor.com/project/Khronoswebmaster/spirv-tools/branch/master) ## Overview The SPIR-V Tools project provides an API and commands for processing SPIR-V modules. The project includes an assembler, binary module parser, disassembler, validator, and optimizer for SPIR-V. Except for the optimizer, all are based on a common static library. The library contains all of the implementation details, and is used in the standalone tools whilst also enabling integration into other code bases directly. The optimizer implementation resides in its own library, which depends on the core library. The interfaces are still under development, and are expected to change. SPIR-V is defined by the Khronos Group Inc. See the [SPIR-V Registry][spirv-registry] for the SPIR-V specification, headers, and XML registry. ## Verisoning SPIRV-Tools See [`CHANGES`](CHANGES) for a high level summary of recent changes, by version. SPIRV-Tools project version numbers are of the form `v`*year*`.`*index* and with an optional `-dev` suffix to indicate work in progress. For exampe, the following versions are ordered from oldest to newest: * `v2016.0` * `v2016.1-dev` * `v2016.1` * `v2016.2-dev` * `v2016.2` Use the `--version` option on each command line tool to see the software version. An API call reports the software version as a C-style string. ## Supported features ### Assembler, binary parser, and disassembler * Based on SPIR-V version 1.1 Rev 3 * Support for extended instruction sets: * GLSL std450 version 1.0 Rev 3 * OpenCL version 1.0 Rev 2 * Support for SPIR-V 1.0 (with or without additional restrictions from Vulkan 1.0) * Assembler only does basic syntax checking. No cross validation of IDs or types is performed, except to check literal arguments to `OpConstant`, `OpSpecConstant`, and `OpSwitch`. See [`syntax.md`](syntax.md) for the assembly language syntax. ### Validator *Warning:* The validator is incomplete. ### Optimizer *Warning:* The optimizer is still under development. Currently supported optimizations: * Strip debug info * Set spec constant default value * Freeze spec constant * Fold `OpSpecConstantOp` and `OpSpecConstantComposite` * Unify constants * Eliminate dead constant For the latest list with detailed documentation, please refer to [`include/spirv-tools/optimizer.hpp`](include/spirv-tools/optimizer.hpp). ## Source code The SPIR-V Tools are maintained by members of the The Khronos Group Inc., at https://github.com/KhronosGroup/SPIRV-Tools. Contributions via merge request are welcome. Changes should: * Be provided under the [Apache 2.0](#license). You'll be prompted with a one-time "click-through" Contributor's License Agreement (CLA) dialog as part of submitting your pull request or other contribution to GitHub. * Include tests to cover updated functionality. * C++ code should follow the [Google C++ Style Guide][cpp-style-guide]. * Code should be formatted with `clang-format`. Settings are defined by the included [.clang-format](.clang-format) file. We intend to maintain a linear history on the GitHub `master` branch. ### Source code organization * `external/googletest`: Intended location for the [googletest][googletest] sources, not provided * `include/`: API clients should add this directory to the include search path * `external/spirv-headers`: Intended location for [SPIR-V headers][spirv-headers], not provided * `include/spirv-tools/libspirv.h`: C API public interface * `source/`: API implementation * `test/`: Tests, using the [googletest][googletest] framework * `tools/`: Command line executables ### Tests The project contains a number of tests, used to drive development and ensure correctness. The tests are written using the [googletest][googletest] framework. The `googletest` source is not provided with this project. There are two ways to enable tests: * If SPIR-V Tools is configured as part of an enclosing project, then the enclosing project should configure `googletest` before configuring SPIR-V Tools. * If SPIR-V Tools is configured as a standalone project, then download the `googletest` source into the `/external/googletest` directory before configuring and building the project. *Note*: You must use a version of googletest that includes [a fix][googletest-pull-612] for [googletest issue 610][googletest-issue-610]. The fix is included on the googletest master branch any time after 2015-11-10. In particular, googletest must be newer than version 1.7.0. ## Build The project uses [CMake][cmake] to generate platform-specific build configurations. Assume that `` is the root directory of the checked out code: ```sh cd git clone https://github.com/KhronosGroup/SPIRV-Headers.git external/spirv-headers git clone https://github.com/google/googletest.git external/googletest # optional mkdir build && cd build cmake [-G ] ``` Once the build files have been generated, build using your preferred development environment. ### CMake options The following CMake options are supported: * `SPIRV_COLOR_TERMINAL={ON|OFF}`, default `ON` - Enables color console output. * `SPIRV_SKIP_TESTS={ON|OFF}`, default `OFF`- Build only the library and the command line tools. This will prevent the tests from being built. * `SPIRV_SKIP_EXECUTABLES={ON|OFF}`, default `OFF`- Build only the library, not the command line tools and tests. * `SPIRV_USE_SANITIZER=`, default is no sanitizing - On UNIX platforms with an appropriate version of `clang` this option enables the use of the sanitizers documented [here][clang-sanitizers]. This should only be used with a debug build. * `SPIRV_WARN_EVERYTHING={ON|OFF}`, default `OFF` - On UNIX platforms enable more strict warnings. The code might not compile with this option enabled. For Clang, enables `-Weverything`. For GCC, enables `-Wpedantic`. See [`CMakeLists.txt`](CMakeLists.txt) for details. * `SPIRV_WERROR={ON|OFF}`, default `ON` - Forces a compilation error on any warnings encountered by enabling the compiler-specific compiler front-end option. ## Library ### Usage The internals of the library use C++11 features, and are exposed via both a C and C++ API. In order to use the library from an application, the include path should point to `/include`, which will enable the application to include the header `/include/spirv-tools/libspirv.h{|pp}` then linking against the static library in `/source/libSPIRV-Tools.a` or `/source/SPIRV-Tools.lib`. For optimization, the header file is `/include/spirv-tools/optimizer.hpp`, and the static library is `/source/libSPIRV-Tools-opt.a` or `/source/SPIRV-Tools-opt.lib`. * `SPIRV-Tools` CMake target: Creates the static library: * `/source/libSPIRV-Tools.a` on Linux and OS X. * `/source/libSPIRV-Tools.lib` on Windows. * `SPIRV-Tools-opt` CMake target: Creates the static library: * `/source/libSPIRV-Tools-opt.a` on Linux and OS X. * `/source/libSPIRV-Tools-opt.lib` on Windows. #### Entry points The interfaces are still under development, and are expected to change. There are five main entry points into the library in the C interface: * `spvTextToBinary`: An assembler, translating text to a binary SPIR-V module. * `spvBinaryToText`: A disassembler, translating a binary SPIR-V module to text. * `spvBinaryParse`: The entry point to a binary parser API. It issues callbacks for the header and each parsed instruction. The disassembler is implemented as a client of `spvBinaryParse`. * `spvValidate` implements the validator functionality. *Incomplete* * `spvValidateBinary` implements the validator functionality. *Incomplete* The C++ interface is comprised of two classes, `SpirvTools` and `Optimizer`, both in the `spvtools` namespace. * `SpirvTools` provides `Assemble`, `Disassemble`, and `Validate` methods. * `Optimizer` provides methods for registering and running optimization passes. ## Command line tools Command line tools, which wrap the above library functions, are provided to assemble or disassemble shader files. It's a convention to name SPIR-V assembly and binary files with suffix `.spvasm` and `.spv`, respectively. ### Assembler tool The assembler reads the assembly language text, and emits the binary form. The standalone assembler is the exectuable called `spirv-as`, and is located in `/tools/spirv-as`. The functionality of the assembler is implemented by the `spvTextToBinary` library function. * `spirv-as` - the standalone assembler * `/tools/as` Use option `-h` to print help. ### Disassembler tool The disassembler reads the binary form, and emits assembly language text. The standalone disassembler is the executable called `spirv-dis`, and is located in `/tools/spirv-dis`. The functionality of the disassembler is implemented by the `spvBinaryToText` library function. * `spirv-dis` - the standalone disassembler * `/tools/dis` Use option `-h` to print help. The output includes syntax colouring when printing to the standard output stream, on Linux, Windows, and OS X. ### Optimizer tool The optimizer processes a SPIR-V binary module, applying transformations in the specified order. This is a work in progress, with initially only few available transformations. * `spirv-opt` - the standalone optimizer * `/tools/opt` ### Validator tool *Warning:* This functionality is under development, and is incomplete. The standalone validator is the executable called `spirv-val`, and is located in `/tools/spirv-val`. The functionality of the validator is implemented by the `spvValidate` library function. The validator operates on the binary form. * `spirv-val` - the standalone validator * `/tools/val` ### Control flow dumper tool The control flow dumper prints the control flow graph for a SPIR-V module as a [GraphViz](http://www.graphviz.org/) graph. This is experimental. * `spirv-cfg` - the control flow graph dumper * `/tools/cfg` ### Utility filters * `spirv-lesspipe.sh` - Automatically disassembles `.spv` binary files for the `less` program, on compatible systems. For example, set the `LESSOPEN` environment variable as follows, assuming both `spirv-lesspipe.sh` and `spirv-dis` are on your executable search path: ``` export LESSOPEN='| spirv-lesspipe.sh "%s"' ``` Then you page through a disassembled module as follows: ``` less foo.spv ``` * The `spirv-lesspipe.sh` script will pass through any extra arguments to `spirv-dis`. So, for example, you can turn off colours and friendly ID naming as follows: ``` export LESSOPEN='| spirv-lesspipe.sh "%s" --no-color --raw-id' ``` * `50spirv-tools.el` - Automatically disassembles '.spv' binary files when loaded into the emacs text editor, and re-assembles them when saved, provided any modifications to the file are valid. This functionality must be explicitly requested by defining the symbol SPIRV_TOOLS_INSTALL_EMACS_HELPERS as follows: ``` cmake -DSPIRV_TOOLS_INSTALL_EMACS_HELPERS=true ... ``` In addition, this helper is only installed if the directory /etc/emacs/site-start.d exists, which is typically true if emacs is installed on the system. Note that symbol IDs are not currently preserved through a load/edit/save operation. This may change if the ability is added to spirv-as. ### Tests Tests are only built when googletest is found. Use `ctest` to run all the tests. ## Future Work ### Assembler and disassembler * The disassembler could emit helpful annotations in comments. For example: * Use variable name information from debug instructions to annotate key operations on variables. * Show control flow information by annotating `OpLabel` instructions with that basic block's predecessors. * Error messages could be improved. ### Validator This is a work in progress. ## Licence Full license terms are in [LICENSE](LICENSE) ``` Copyright (c) 2015-2016 The Khronos Group Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ``` [spirv-registry]: https://www.khronos.org/registry/spir-v/ [spirv-headers]: https://github.com/KhronosGroup/SPIRV-Headers [googletest]: https://github.com/google/googletest [googletest-pull-612]: https://github.com/google/googletest/pull/612 [googletest-issue-610]: https://github.com/google/googletest/issues/610 [CMake]: https://cmake.org/ [cpp-style-guide]: https://google.github.io/styleguide/cppguide.html [clang-sanitizers]: http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation