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David Neto 6bad02c320 Float literal parsing fixes 
- For 32- and 64-bit floats, overflow is a parse error

  This works around a difference between Xcode's istringstream
  and other platforms.  Xcode's runtime library will happlily
  "round up" overflow values to infinity.  We want to make it fail.

- When parsing a float fails due to bad syntax, follow C++11
  behaviour for operator>> and set the value to zero.

- When parsing a 32-bit or 64-bit float overflows, follow C++11
  behaviour for operator>> and set the value to the nearest
  normal value: either max or lowest finite value for the type.

- Add FloatProxy<T>::max() and ::lowest()

- Make 16-bit overflow behaviour more consistent: we always get a
  16-bit infinity of the right sign, whether the original string
  is a normal value for 32-bit or an overflow value for 32-bit.
  That matches our earlier intent.
  Added TODO's to make 16-bit overflow always an error, just like
  for 32-bit and 64-bit.

- Simplify normal parsing of Float16 values by delegating to
  normal parsing of 32-bit floats.
2016-02-12 16:01:42 -05:00
external/include/headers Extend copyright to 2016. 2016-01-07 13:44:22 -05:00
include Float literal parsing fixes 2016-02-12 16:01:42 -05:00
source Make IsTypeNullable a transitive check. 2016-02-04 15:34:47 -05:00
test Float literal parsing fixes 2016-02-12 16:01:42 -05:00
tools Add disassembler option to show byte offset 2016-01-20 17:07:30 -05:00
.clang-format Run clang-format to enforce Google style globally. 2015-11-10 15:56:47 -05:00
.gitignore Basic SSA Validation 2015-12-09 16:15:00 -05:00
.travis.yml Since g++-4.9 has an ICE occasionally in travis add a retry. 2016-01-19 16:14:47 -05:00
CMakeLists.txt Enable ctest. 2016-02-02 16:05:11 -05:00
LICENSE Extend copyright to 2016. 2016-01-07 13:44:22 -05:00
README.md Enable ctest. 2016-02-02 16:05:11 -05:00
syntax.md Disassembler support for OpSpecConstantOp 2015-11-11 12:12:07 -05:00

README.md

SPIR-V Tools

Build Status

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.

Supported features

Assembler, binary parser, and disassembler

  • Based on SPIR-V 1.0 Revision 2.
    • Supports GLSL std450 extended instructions.
    • Supports OpenCL extended instructions.
  • 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:

We intend to maintain a linear history on the GitHub master branch.

Source code organization

  • external/headers: Standard SPIR-V header files used by the implementation, from the SPIR-V Registry
  • external/googletest: Intended location for the googletest sources, not provided.
  • include/libspirv/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. 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. To generate these build files, issue the following commands:

mkdir <spirv-dir>/build
cd <spirv-dir>/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/libspirv/libspirv.h then linking against the static library in <spirv-build-dir>/libSPIRV-Tools.a or <spirv-build-dir>/SPIRV-Tools.lib.

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

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

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

  • spirv-dis - the standalone disassembler
    • <spirv-dir>/spirv-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.

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>/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>/spirv-val

Tests

Tests are only built when googletest is found.

The <spirv-build-dir>/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

Copyright (c) 2015-2016 The Khronos Group Inc.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Materials.

MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
   https://www.khronos.org/registry/

THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.