[Mesa-dev] [PATCH 04/11] nir/spirv: add gl_spirv_validation method
Timothy Arceri
tarceri at itsqueeze.com
Fri Mar 16 10:47:09 UTC 2018
On 08/03/18 19:19, Alejandro Piñeiro wrote:
> ARB_gl_spirv adds the ability to use SPIR-V binaries, and a new
> method, glSpecializeShader. From OpenGL 4.6 spec, section 7.2.1
> "Shader Specialization", error table:
>
> INVALID_VALUE is generated if <pEntryPoint> does not name a valid
> entry point for <shader>.
>
> INVALID_VALUE is generated if any element of <pConstantIndex>
> refers to a specialization constant that does not exist in the
> shader module contained in <shader>.""
>
> But we are not really interested on creating the nir shader at that
> point, and adding nir structures on the gl_program, so at that point
> we are just interested on the error checking.
>
> So we add a new method focused on just checking those errors. It still
> needs to parse the binary, but skips what it is not needed, and
> doesn't create the nir shader.
>
> v2: rebase update (spirv_to_nir options added, changes on the warning
> logging, and others)
>
> v3: include passing options on common initialization, doesn't call
> setjmp on common_initialization
>
> v4: (after Jason comments):
> * Rename common_initialization to vtn_builder_create
> * Move validation method and their helpers to own source file.
> * Create own handle_constant_decoration_cb instead of reuse existing one
>
> v5: put vtn_build_create refactoring to their own patch (Jason)
> ---
> src/compiler/Makefile.sources | 1 +
> src/compiler/nir/meson.build | 1 +
> src/compiler/spirv/gl_spirv.c | 268 ++++++++++++++++++++++++++++++++++++++
> src/compiler/spirv/nir_spirv.h | 5 +
> src/compiler/spirv/spirv_to_nir.c | 35 +++--
> src/compiler/spirv/vtn_private.h | 6 +
> 6 files changed, 302 insertions(+), 14 deletions(-)
> create mode 100644 src/compiler/spirv/gl_spirv.c
>
> diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources
> index 37340ba809e..24218985d6d 100644
> --- a/src/compiler/Makefile.sources
> +++ b/src/compiler/Makefile.sources
> @@ -295,6 +295,7 @@ SPIRV_GENERATED_FILES = \
> spirv/vtn_gather_types.c
>
> SPIRV_FILES = \
> + spirv/gl_spirv.c \
> spirv/GLSL.std.450.h \
> spirv/nir_spirv.h \
> spirv/spirv.h \
> diff --git a/src/compiler/nir/meson.build b/src/compiler/nir/meson.build
> index a70c236b958..e7a94bcc1cf 100644
> --- a/src/compiler/nir/meson.build
> +++ b/src/compiler/nir/meson.build
> @@ -183,6 +183,7 @@ files_libnir = files(
> 'nir_vla.h',
> 'nir_worklist.c',
> 'nir_worklist.h',
> + '../spirv/gl_spirv.c',
> '../spirv/GLSL.std.450.h',
> '../spirv/nir_spirv.h',
> '../spirv/spirv.h',
> diff --git a/src/compiler/spirv/gl_spirv.c b/src/compiler/spirv/gl_spirv.c
> new file mode 100644
> index 00000000000..e82686bfe0d
> --- /dev/null
> +++ b/src/compiler/spirv/gl_spirv.c
> @@ -0,0 +1,268 @@
> +/*
> + * Copyright © 2017 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS 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 SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + *
> + */
> +
> +#include "nir_spirv.h"
> +
> +#include "vtn_private.h"
> +#include "spirv_info.h"
> +
> +static bool
> +vtn_validate_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
> + const uint32_t *w, unsigned count)
> +{
> + switch (opcode) {
> + case SpvOpSource:
> + case SpvOpSourceExtension:
> + case SpvOpSourceContinued:
> + case SpvOpExtension:
> + case SpvOpCapability:
> + case SpvOpExtInstImport:
> + case SpvOpMemoryModel:
> + case SpvOpString:
> + case SpvOpName:
> + case SpvOpMemberName:
> + case SpvOpExecutionMode:
> + case SpvOpDecorationGroup:
> + case SpvOpMemberDecorate:
> + case SpvOpGroupDecorate:
> + case SpvOpGroupMemberDecorate:
> + break;
> +
> + case SpvOpEntryPoint:
> + vtn_handle_entry_point(b, w, count);
> + break;
> +
> + case SpvOpDecorate:
> + vtn_handle_decoration(b, opcode, w, count);
> + break;
> +
> + default:
> + return false; /* End of preamble */
> + }
> +
> + return true;
> +}
> +
> +static void
> +spec_constant_decoration_cb(struct vtn_builder *b, struct vtn_value *v,
> + int member, const struct vtn_decoration *dec,
> + void *data)
> +{
> + vtn_assert(member == -1);
> + if (dec->decoration != SpvDecorationSpecId)
> + return;
> +
> + for (unsigned i = 0; i < b->num_specializations; i++) {
> + if (b->specializations[i].id == dec->literals[0]) {
> + b->specializations[i].defined_on_module = true;
> + return;
> + }
> + }
> +}
> +
> +static void
> +vtn_validate_handle_constant(struct vtn_builder *b, SpvOp opcode,
> + const uint32_t *w, unsigned count)
> +{
> + struct vtn_value *val = vtn_push_value(b, w[2], vtn_value_type_constant);
> +
> + switch (opcode) {
> + case SpvOpConstant:
> + case SpvOpConstantNull:
> + case SpvOpSpecConstantComposite:
> + case SpvOpConstantComposite:
> + /* Nothing to do here for gl_spirv needs */
> + break;
> +
> + case SpvOpConstantTrue:
> + case SpvOpConstantFalse:
> + case SpvOpSpecConstantTrue:
> + case SpvOpSpecConstantFalse:
> + case SpvOpSpecConstant:
> + case SpvOpSpecConstantOp:
> + vtn_foreach_decoration(b, val, spec_constant_decoration_cb, NULL);
> + break;
> +
> + case SpvOpConstantSampler:
> + vtn_fail("OpConstantSampler requires Kernel Capability");
> + break;
> +
> + default:
> + vtn_fail("Unhandled opcode");
> + }
> +}
> +
> +static bool
> +vtn_validate_handle_constant_instruction(struct vtn_builder *b, SpvOp opcode,
> + const uint32_t *w, unsigned count)
> +{
> + switch (opcode) {
> + case SpvOpSource:
> + case SpvOpSourceContinued:
> + case SpvOpSourceExtension:
> + case SpvOpExtension:
> + case SpvOpCapability:
> + case SpvOpExtInstImport:
> + case SpvOpMemoryModel:
> + case SpvOpEntryPoint:
> + case SpvOpExecutionMode:
> + case SpvOpString:
> + case SpvOpName:
> + case SpvOpMemberName:
> + case SpvOpDecorationGroup:
> + case SpvOpDecorate:
> + case SpvOpMemberDecorate:
> + case SpvOpGroupDecorate:
> + case SpvOpGroupMemberDecorate:
> + vtn_fail("Invalid opcode types and variables section");
> + break;
> +
> + case SpvOpTypeVoid:
> + case SpvOpTypeBool:
> + case SpvOpTypeInt:
> + case SpvOpTypeFloat:
> + case SpvOpTypeVector:
> + case SpvOpTypeMatrix:
> + case SpvOpTypeImage:
> + case SpvOpTypeSampler:
> + case SpvOpTypeSampledImage:
> + case SpvOpTypeArray:
> + case SpvOpTypeRuntimeArray:
> + case SpvOpTypeStruct:
> + case SpvOpTypeOpaque:
> + case SpvOpTypePointer:
> + case SpvOpTypeFunction:
> + case SpvOpTypeEvent:
> + case SpvOpTypeDeviceEvent:
> + case SpvOpTypeReserveId:
> + case SpvOpTypeQueue:
> + case SpvOpTypePipe:
> + /* We don't need to handle types */
> + break;
> +
> + case SpvOpConstantTrue:
> + case SpvOpConstantFalse:
> + case SpvOpConstant:
> + case SpvOpConstantComposite:
> + case SpvOpConstantSampler:
> + case SpvOpConstantNull:
> + case SpvOpSpecConstantTrue:
> + case SpvOpSpecConstantFalse:
> + case SpvOpSpecConstant:
> + case SpvOpSpecConstantComposite:
> + case SpvOpSpecConstantOp:
> + vtn_validate_handle_constant(b, opcode, w, count);
> + break;
> +
> + case SpvOpUndef:
> + case SpvOpVariable:
> + /* We don't need to handle them */
> + break;
> +
> + default:
> + return false; /* End of preamble */
> + }
> +
> + return true;
> +}
> +
> +/*
> + * Since OpenGL 4.6 you can use SPIR-V modules directly on OpenGL. One of the
> + * new methods, glSpecializeShader include some possible errors when trying to
> + * use it. From OpenGL 4.6, Section 7.2.1, "Shader Specialization":
> + *
> + * "void SpecializeShaderARB(uint shader,
> + * const char* pEntryPoint,
> + * uint numSpecializationConstants,
> + * const uint* pConstantIndex,
> + * const uint* pConstantValue);
> + * <skip>
> + *
> + * INVALID_VALUE is generated if <pEntryPoint> does not name a valid
> + * entry point for <shader>.
> + *
> + * An INVALID_VALUE error is generated if any element of pConstantIndex refers
> + * to a specialization constant that does not exist in the shader module
> + * contained in shader."
> + *
> + * We could do those checks on spirv_to_nir, but we are only interested on the
> + * full translation later, during linking. This method is a simplified version
> + * of spirv_to_nir, looking for only the checks needed by SpecializeShader.
> + *
> + * This method returns NULL if no entry point was found, and fill the
> + * nir_spirv_specialization field "defined_on_module" accordingly. Caller
> + * would need to trigger the specific errors.
> + *
> + */
> +bool
> +gl_spirv_validation(const uint32_t *words, size_t word_count,
> + struct nir_spirv_specialization *spec, unsigned num_spec,
> + gl_shader_stage stage, const char *entry_point_name)
> +{
> + /* vtn_warn/vtn_log uses debug.func. Setting a null to prevent crash. Not
> + * need to print the warnings now, would be done later, on the real
> + * spirv_to_nir
> + */
> + const struct spirv_to_nir_options options = { .debug.func = NULL};
> + const uint32_t *word_end = words + word_count;
> +
> + struct vtn_builder *b = vtn_builder_create(words, word_count,
> + stage, entry_point_name,
> + &options);
> +
> + if (b == NULL)
> + return false;
> +
> + /* See also _vtn_fail() */
> + if (setjmp(b->fail_jump)) {
> + ralloc_free(b);
> + return false;
> + }
> +
> + words+= 5;
Can you add a comment explaining what this is about? It just some magic
code to me.
I saw this in the previous patch too. I assume we are just getting past
some sort of header, but maybe a define would be a good idea since its
done in multiple places.
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