commit	9fc8658ef301b0f03b2173d274c52f011b5c73e5	[log] [tgz]
author	David Neto <dneto@google.com>	Thu Sep 01 15:33:59 2016 -0400
committer	David Neto <dneto@google.com>	Fri Sep 02 10:00:29 2016 -0400
tree	2a88242a9f19ac841977123578c1434fa032a690
parent	6f35405a977393949759a5fbf72d29e806981d65 [diff]

Relicense SPIRV-Tools under Apache 2.0

Fixes https://github.com/KhronosGroup/SPIRV-Tools/issues/383

Finalize v2016.4

198 files changed

tree: 2a88242a9f19ac841977123578c1434fa032a690

README.md

SPIR-V Tools

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, and validator for SPIR-V, all 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 interfaces are still under development, and are expected to change.

SPIR-V is defined by the Khronos Group Inc. See the SPIR-V Registry for the SPIR-V specification, headers, and XML registry.

Verisoning SPIRV-Tools

See CHANGES for a high level summary of recent changes, by version.

SPIRV-Tools project version numbers are of the form vyear.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 for the assembly language syntax.

Validator

Warning: The validator is incomplete.

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.
Include tests to cover updated functionality.
C++ code should follow the Google C++ Style Guide.
Code should be formatted with clang-format. Settings are defined by the included .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 sources, not provided
include/: API clients should add this directory to the include search path
external/spirv-headers: Intended location for SPIR-V headers, not provided
include/spirv-tools/libspirv.h: C API public interface
source/: API implementation
test/: Tests, using the 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 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 <spirv-dir>/external/googletest directory before configuring and building the project.

Note: You must use a version of googletest that includes a fix for 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 to generate platform-specific build configurations. Assume that <spirv-dir> is the root directory of the checked out code:

cd <spirv-dir>
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 <platform-generator>] <spirv-dir>

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_EXECUTABLES={ON|OFF}, default OFF- Build only the library, not the command line tools. This will also prevent the tests from being built.
SPIRV_USE_SANITIZER=<sanitizer>, default is no sanitizing - On UNIX platforms with an appropriate version of clang this option enables the use of the sanitizers documented here. 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 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 library provides a C API, but the internals use C++11.

In order to use the library from an application, the include path should point to <spirv-dir>/include, which will enable the application to include the header <spirv-dir>/include/spirv-tools/libspirv.h then linking against the static library in <spirv-build-dir>/source/libSPIRV-Tools.a or <spirv-build-dir>/source/SPIRV-Tools.lib.

SPIRV-Tools CMake target: Creates the static library:
- <spirv-build-dir>/source/libSPIRV-Tools.a on Linux and OS X.
- <spirv-build-dir>/source/libSPIRV-Tools.lib on Windows.

Entry points

The interfaces are still under development, and are expected to change.

There are three main entry points into the library.

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

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 <spirv-build-dir>/tools/spirv-as. The functionality of the assembler is implemented by the spvTextToBinary library function.

spirv-as - the standalone assembler
- <spirv-dir>/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 <spirv-build-dir>/tools/spirv-dis. The functionality of the disassembler is implemented by the spvBinaryToText library function.

spirv-dis - the standalone disassembler
- <spirv-dir>/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
- <spirv-dir>/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 <spirv-build-dir>/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
- <spirv-dir>/tools/val

Control flow dumper tool

The control flow dumper prints the control flow graph for a SPIR-V module as a GraphViz graph.

This is experimental.

spirv-cfg - the control flow graph dumper
- <spirv-dir>/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'
```

Tests

Tests are only built when googletest is found.

The <spirv-build-dir>/test/UnitSPIRV executable runs the project tests. It supports the standard googletest command line options.

The project also adds a CMake test spirv-tools-testsuite, which executes UnitSPIRV. That way it's possible to run the tests using ctest.

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

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.