[Mesa-dev] [PATCH 4/8] st/mesa: implement a tgsi on-disk shader cache
Nicolai Hähnle
nhaehnle at gmail.com
Wed Feb 22 11:07:28 UTC 2017
On 22.02.2017 04:45, Timothy Arceri wrote:
> Implements a tgsi cache for the OpenGL state tracker.
>
> V2: add support for compute shaders
> ---
> src/mesa/Makefile.sources | 2 +
> src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 6 +
> src/mesa/state_tracker/st_program.c | 27 +-
> src/mesa/state_tracker/st_shader_cache.c | 406 +++++++++++++++++++++++++++++
> src/mesa/state_tracker/st_shader_cache.h | 46 ++++
> 5 files changed, 481 insertions(+), 6 deletions(-)
> create mode 100644 src/mesa/state_tracker/st_shader_cache.c
> create mode 100644 src/mesa/state_tracker/st_shader_cache.h
>
> diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources
> index ee737b0..9262967 100644
> --- a/src/mesa/Makefile.sources
> +++ b/src/mesa/Makefile.sources
> @@ -514,6 +514,8 @@ STATETRACKER_FILES = \
> state_tracker/st_sampler_view.h \
> state_tracker/st_scissor.c \
> state_tracker/st_scissor.h \
> + state_tracker/st_shader_cache.c \
> + state_tracker/st_shader_cache.h \
> state_tracker/st_texture.c \
> state_tracker/st_texture.h \
> state_tracker/st_tgsi_lower_yuv.c \
> diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> index 476d185..d43d821 100644
> --- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> +++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
> @@ -54,6 +54,7 @@
> #include "st_format.h"
> #include "st_glsl_types.h"
> #include "st_nir.h"
> +#include "st_shader_cache.h"
>
> #include <algorithm>
>
> @@ -6870,6 +6871,11 @@ extern "C" {
> GLboolean
> st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
> {
> + /* Return early if we are loading the shader from on-disk cache */
> + if (st_load_tgsi_from_disk_cache(ctx, prog)) {
> + return GL_TRUE;
> + }
> +
> struct pipe_screen *pscreen = ctx->st->pipe->screen;
> assert(prog->data->LinkStatus);
>
> diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
> index 3795f25..4d9250b 100644
> --- a/src/mesa/state_tracker/st_program.c
> +++ b/src/mesa/state_tracker/st_program.c
> @@ -58,6 +58,7 @@
> #include "st_mesa_to_tgsi.h"
> #include "st_atifs_to_tgsi.h"
> #include "st_nir.h"
> +#include "st_shader_cache.h"
> #include "cso_cache/cso_context.h"
>
>
> @@ -364,7 +365,6 @@ st_release_cp_variants(struct st_context *st, struct st_compute_program *stcp)
> }
> }
>
> -
> /**
> * Translate a vertex program.
> */
> @@ -583,7 +583,6 @@ st_translate_vertex_program(struct st_context *st,
> &stvp->tgsi.stream_output);
>
> free_glsl_to_tgsi_visitor(stvp->glsl_to_tgsi);
> - stvp->glsl_to_tgsi = NULL;
> } else
> error = st_translate_mesa_program(st->ctx,
> PIPE_SHADER_VERTEX,
> @@ -608,8 +607,15 @@ st_translate_vertex_program(struct st_context *st,
> return false;
> }
>
> - stvp->tgsi.tokens = ureg_get_tokens(ureg, NULL);
> + unsigned num_tokens;
> + stvp->tgsi.tokens = ureg_get_tokens(ureg, &num_tokens);
> ureg_destroy(ureg);
> +
> + if (stvp->glsl_to_tgsi) {
> + stvp->glsl_to_tgsi = NULL;
> + st_store_tgsi_in_disk_cache(st, &stvp->Base, NULL, num_tokens);
> + }
> +
> return stvp->tgsi.tokens != NULL;
> }
>
> @@ -1031,7 +1037,6 @@ st_translate_fragment_program(struct st_context *st,
> fs_output_semantic_index);
>
> free_glsl_to_tgsi_visitor(stfp->glsl_to_tgsi);
> - stfp->glsl_to_tgsi = NULL;
> } else if (stfp->ati_fs)
> st_translate_atifs_program(ureg,
> stfp->ati_fs,
> @@ -1064,8 +1069,15 @@ st_translate_fragment_program(struct st_context *st,
> fs_output_semantic_name,
> fs_output_semantic_index);
>
> - stfp->tgsi.tokens = ureg_get_tokens(ureg, NULL);
> + unsigned num_tokens;
> + stfp->tgsi.tokens = ureg_get_tokens(ureg, &num_tokens);
> ureg_destroy(ureg);
> +
> + if (stfp->glsl_to_tgsi) {
> + stfp->glsl_to_tgsi = NULL;
> + st_store_tgsi_in_disk_cache(st, &stfp->Base, NULL, num_tokens);
> + }
> +
> return stfp->tgsi.tokens != NULL;
> }
>
> @@ -1600,13 +1612,16 @@ st_translate_program_common(struct st_context *st,
> output_semantic_name,
> output_semantic_index);
>
> - out_state->tokens = ureg_get_tokens(ureg, NULL);
> + unsigned num_tokens;
> + out_state->tokens = ureg_get_tokens(ureg, &num_tokens);
> ureg_destroy(ureg);
>
> st_translate_stream_output_info(glsl_to_tgsi,
> outputMapping,
> &out_state->stream_output);
>
> + st_store_tgsi_in_disk_cache(st, prog, out_state, num_tokens);
> +
> if ((ST_DEBUG & DEBUG_TGSI) && (ST_DEBUG & DEBUG_MESA)) {
> _mesa_print_program(prog);
> debug_printf("\n");
> diff --git a/src/mesa/state_tracker/st_shader_cache.c b/src/mesa/state_tracker/st_shader_cache.c
> new file mode 100644
> index 0000000..84ad94e
> --- /dev/null
> +++ b/src/mesa/state_tracker/st_shader_cache.c
> @@ -0,0 +1,406 @@
> +/*
> + * Copyright © 2017 Timothy Arceri
> + *
> + * 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 <stdio.h>
> +
> +#include "st_program.h"
> +#include "st_shader_cache.h"
> +#include "compiler/glsl/program.h"
> +#include "pipe/p_shader_tokens.h"
> +#include "program/ir_to_mesa.h"
> +#include "util/u_memory.h"
> +
> +static void
> +write_stream_out_to_cache(struct blob *blob,
> + struct pipe_shader_state *tgsi)
> +{
> + blob_write_bytes(blob, &tgsi->stream_output,
> + sizeof(tgsi->stream_output));
> +}
> +
> +static void
> +write_tgsi_to_cache(struct blob *blob, struct pipe_shader_state *tgsi,
> + struct st_context *st, unsigned char *sha1,
> + unsigned num_tokens)
> +{
> + blob_write_uint32(blob, num_tokens);
> + blob_write_bytes(blob, tgsi->tokens,
> + num_tokens * sizeof(struct tgsi_token));
> +
> + disk_cache_put(st->ctx->Cache, sha1, blob->data, blob->size);
> +}
> +
> +/**
> + * Store tgsi and any other required state in on-disk shader cache.
> + */
> +void
> +st_store_tgsi_in_disk_cache(struct st_context *st, struct gl_program *prog,
> + struct pipe_shader_state *out_state,
> + unsigned num_tokens)
> +{
> + if (!st->ctx->Cache)
> + return;
> +
> + /* Exit early when we are dealing with a ff shader with no source file to
> + * generate a source from.
> + */
> + if (*prog->sh.data->sha1 == 0)
> + return;
> +
> + unsigned char *sha1;
> + struct blob *blob = blob_create(NULL);
> +
> + switch (prog->info.stage) {
> + case MESA_SHADER_VERTEX: {
> + struct st_vertex_program *stvp = (struct st_vertex_program *) prog;
> + sha1 = stvp->sha1;
> +
> + blob_write_uint32(blob, stvp->num_inputs);
> + blob_write_bytes(blob, stvp->index_to_input,
> + sizeof(stvp->index_to_input));
> + blob_write_bytes(blob, stvp->result_to_output,
> + sizeof(stvp->result_to_output));
> +
> + write_stream_out_to_cache(blob, &stvp->tgsi);
> + write_tgsi_to_cache(blob, &stvp->tgsi, st, sha1, num_tokens);
> + break;
> + }
> + case MESA_SHADER_TESS_EVAL: {
> + struct st_tesseval_program *step = (struct st_tesseval_program *) prog;
> + sha1 = step->sha1;
> +
> + write_stream_out_to_cache(blob, out_state);
> + write_tgsi_to_cache(blob, out_state, st, sha1, num_tokens);
> + break;
> + }
> + case MESA_SHADER_TESS_CTRL: {
> + struct st_tessctrl_program *stcp = (struct st_tessctrl_program *) prog;
> + sha1 = stcp->sha1;
> +
> + write_stream_out_to_cache(blob, out_state);
> + write_tgsi_to_cache(blob, out_state, st, sha1, num_tokens);
> + break;
> + }
> + case MESA_SHADER_GEOMETRY: {
> + struct st_geometry_program *stgp = (struct st_geometry_program *) prog;
> + sha1 = stgp->sha1;
> +
> + write_stream_out_to_cache(blob, out_state);
> + write_tgsi_to_cache(blob, out_state, st, sha1, num_tokens);
> + break;
> + }
> + case MESA_SHADER_FRAGMENT: {
> + struct st_fragment_program *stfp = (struct st_fragment_program *) prog;
> + sha1 = stfp->sha1;
> +
> + write_tgsi_to_cache(blob, &stfp->tgsi, st, sha1, num_tokens);
> + break;
> + }
> + case MESA_SHADER_COMPUTE: {
> + struct st_compute_program *stcp = (struct st_compute_program *) prog;
> + sha1 = stcp->sha1;
> +
> + write_tgsi_to_cache(blob, out_state, st, sha1, num_tokens);
> + break;
> + }
> + default:
> + unreachable("Unsupported stage");
> + }
> +
> + if (st->ctx->_Shader->Flags & GLSL_CACHE_INFO) {
> + char sha1_buf[41];
> + _mesa_sha1_format(sha1_buf, sha1);
> + fprintf(stderr, "putting %s tgsi_tokens in cache: %s\n",
> + _mesa_shader_stage_to_string(prog->info.stage), sha1_buf);
> + }
> +
> + ralloc_free(blob);
> +}
> +
> +static void
> +read_stream_out_from_cache(struct blob_reader *blob_reader,
> + struct pipe_shader_state *tgsi)
> +{
> + blob_copy_bytes(blob_reader, (uint8_t *) &tgsi->stream_output,
> + sizeof(tgsi->stream_output));
> +}
> +
> +static void
> +read_tgsi_from_cache(struct blob_reader *blob_reader,
> + const struct tgsi_token **tokens)
> +{
> + uint32_t num_tokens = blob_read_uint32(blob_reader);
> + unsigned tokens_size = num_tokens * sizeof(struct tgsi_token);
> + *tokens = (const struct tgsi_token*) MALLOC(tokens_size);
> + blob_copy_bytes(blob_reader, (uint8_t *) *tokens, tokens_size);
> +}
> +
> +bool
> +st_load_tgsi_from_disk_cache(struct gl_context *ctx,
> + struct gl_shader_program *prog)
> +{
> + if (!ctx->Cache)
> + return false;
> +
> + unsigned char *stage_sha1[MESA_SHADER_STAGES];
> + char sha1_buf[41];
> +
> + /* Compute and store sha1 for each stage. These will be reused by the
> + * cache store pass if we fail to find the cached tgsi.
> + */
> + for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
> + if (prog->_LinkedShaders[i] == NULL)
> + continue;
> +
> + char *buf = ralloc_strdup(NULL, "tgsi_tokens ");
> + _mesa_sha1_format(sha1_buf,
> + prog->_LinkedShaders[i]->Program->sh.data->sha1);
> + ralloc_strcat(&buf, sha1_buf);
> +
> + struct gl_program *glprog = prog->_LinkedShaders[i]->Program;
> + switch (glprog->info.stage) {
> + case MESA_SHADER_VERTEX: {
> + struct st_vertex_program *stvp = (struct st_vertex_program *) glprog;
> + stage_sha1[i] = stvp->sha1;
> + ralloc_strcat(&buf, " vs");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
> + case MESA_SHADER_TESS_EVAL: {
> + struct st_tesseval_program *step =
> + (struct st_tesseval_program *) glprog;
> + stage_sha1[i] = step->sha1;
> + ralloc_strcat(&buf, " tes");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
> + case MESA_SHADER_TESS_CTRL: {
> + struct st_tessctrl_program *stcp =
> + (struct st_tessctrl_program *) glprog;
> + stage_sha1[i] = stcp->sha1;
> + ralloc_strcat(&buf, " tcs");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
Nitpick: I'd suggest to flip the order of TESS_CTRL and TESS_EVAL to
match their order in the pipeline. The same goes below.
Cheers,
Nicolai
> + case MESA_SHADER_GEOMETRY: {
> + struct st_geometry_program *stgp =
> + (struct st_geometry_program *) glprog;
> + stage_sha1[i] = stgp->sha1;
> + ralloc_strcat(&buf, " gs");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
> + case MESA_SHADER_FRAGMENT: {
> + struct st_fragment_program *stfp =
> + (struct st_fragment_program *) glprog;
> + stage_sha1[i] = stfp->sha1;
> + ralloc_strcat(&buf, " fs");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
> + case MESA_SHADER_COMPUTE: {
> + struct st_compute_program *stcp =
> + (struct st_compute_program *) glprog;
> + stage_sha1[i] = stcp->sha1;
> + ralloc_strcat(&buf, " cs");
> + _mesa_sha1_compute(buf, strlen(buf), stage_sha1[i]);
> + break;
> + }
> + default:
> + unreachable("Unsupported stage");
> + }
> +
> + ralloc_free(buf);
> + }
> +
> + struct st_context *st = st_context(ctx);
> + for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
> + if (prog->_LinkedShaders[i] == NULL)
> + continue;
> +
> + unsigned char *sha1 = stage_sha1[i];
> + size_t size;
> + uint8_t *buffer = (uint8_t *) disk_cache_get(ctx->Cache, sha1, &size);
> + if (buffer) {
> + struct blob_reader blob_reader;
> + blob_reader_init(&blob_reader, buffer, size);
> +
> + struct gl_program *glprog = prog->_LinkedShaders[i]->Program;
> + switch (glprog->info.stage) {
> + case MESA_SHADER_VERTEX: {
> + struct st_vertex_program *stvp =
> + (struct st_vertex_program *) glprog;
> +
> + st_release_vp_variants(st, stvp);
> +
> + stvp->num_inputs = blob_read_uint32(&blob_reader);
> + blob_copy_bytes(&blob_reader, (uint8_t *) stvp->index_to_input,
> + sizeof(stvp->index_to_input));
> + blob_copy_bytes(&blob_reader, (uint8_t *) stvp->result_to_output,
> + sizeof(stvp->result_to_output));
> +
> + read_stream_out_from_cache(&blob_reader, &stvp->tgsi);
> + read_tgsi_from_cache(&blob_reader, &stvp->tgsi.tokens);
> +
> + if (st->vp == stvp)
> + st->dirty |= ST_NEW_VERTEX_PROGRAM(st, stvp);
> +
> + break;
> + }
> + case MESA_SHADER_TESS_EVAL: {
> + struct st_tesseval_program *sttep =
> + (struct st_tesseval_program *) glprog;
> +
> + st_release_basic_variants(st, sttep->Base.Target,
> + &sttep->variants, &sttep->tgsi);
> +
> + read_stream_out_from_cache(&blob_reader, &sttep->tgsi);
> + read_tgsi_from_cache(&blob_reader, &sttep->tgsi.tokens);
> +
> + if (st->tep == sttep)
> + st->dirty |= sttep->affected_states;
> +
> + break;
> + }
> + case MESA_SHADER_TESS_CTRL: {
> + struct st_tessctrl_program *sttcp =
> + (struct st_tessctrl_program *) glprog;
> +
> + st_release_basic_variants(st, sttcp->Base.Target,
> + &sttcp->variants, &sttcp->tgsi);
> +
> + read_stream_out_from_cache(&blob_reader, &sttcp->tgsi);
> + read_tgsi_from_cache(&blob_reader, &sttcp->tgsi.tokens);
> +
> + if (st->tcp == sttcp)
> + st->dirty |= sttcp->affected_states;
> +
> + break;
> + }
> + case MESA_SHADER_GEOMETRY: {
> + struct st_geometry_program *stgp =
> + (struct st_geometry_program *) glprog;
> +
> + st_release_basic_variants(st, stgp->Base.Target, &stgp->variants,
> + &stgp->tgsi);
> +
> + read_stream_out_from_cache(&blob_reader, &stgp->tgsi);
> + read_tgsi_from_cache(&blob_reader, &stgp->tgsi.tokens);
> +
> + if (st->gp == stgp)
> + st->dirty |= stgp->affected_states;
> +
> + break;
> + }
> + case MESA_SHADER_FRAGMENT: {
> + struct st_fragment_program *stfp =
> + (struct st_fragment_program *) glprog;
> +
> + st_release_fp_variants(st, stfp);
> +
> + read_tgsi_from_cache(&blob_reader, &stfp->tgsi.tokens);
> +
> + if (st->fp == stfp)
> + st->dirty |= stfp->affected_states;
> +
> + break;
> + }
> + case MESA_SHADER_COMPUTE: {
> + struct st_compute_program *stcp =
> + (struct st_compute_program *) glprog;
> +
> + st_release_cp_variants(st, stcp);
> +
> + read_tgsi_from_cache(&blob_reader,
> + (const struct tgsi_token**) &stcp->tgsi.prog);
> +
> + stcp->tgsi.req_local_mem = stcp->Base.info.cs.shared_size;
> + stcp->tgsi.req_private_mem = 0;
> + stcp->tgsi.req_input_mem = 0;
> +
> + if (st->cp == stcp)
> + st->dirty |= stcp->affected_states;
> +
> + break;
> + }
> + default:
> + unreachable("Unsupported stage");
> + }
> +
> + if (blob_reader.current != blob_reader.end || blob_reader.overrun) {
> + /* Something very bad has gone wrong discard the item from the
> + * cache and rebuild/link from source.
> + */
> + assert(!"Invalid TGSI shader disk cache item!");
> +
> + if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
> + fprintf(stderr, "Error reading program from cache (invalid "
> + "TGSI cache item)\n");
> + }
> +
> + disk_cache_remove(ctx->Cache, sha1);
> +
> + goto fallback_recompile;
> + }
> +
> + if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
> + _mesa_sha1_format(sha1_buf, sha1);
> + fprintf(stderr, "%s tgsi_tokens retrieved from cache: %s\n",
> + _mesa_shader_stage_to_string(i), sha1_buf);
> + }
> +
> + st_set_prog_affected_state_flags(glprog);
> + _mesa_associate_uniform_storage(ctx, prog, glprog->Parameters);
> +
> + free(buffer);
> + } else {
> + /* Failed to find a matching cached shader so fallback to recompile.
> + */
> + if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
> + fprintf(stderr, "TGSI cache item not found falling back to "
> + "compile.\n");
> + }
> +
> + goto fallback_recompile;
> + }
> + }
> +
> + return true;
> +
> +fallback_recompile:
> +
> + /* GLSL IR was compiled and linked so just fallback to the regular
> + * glsl to tgsi path.
> + */
> + if (prog->data->LinkStatus != linking_skipped)
> + return false;
> +
> + for (unsigned i = 0; i < prog->NumShaders; i++) {
> + _mesa_glsl_compile_shader(ctx, prog->Shaders[i], false, false, true);
> + }
> +
> + prog->data->cache_fallback = true;
> + _mesa_glsl_link_shader(ctx, prog);
> +
> + return true;
> +}
> diff --git a/src/mesa/state_tracker/st_shader_cache.h b/src/mesa/state_tracker/st_shader_cache.h
> new file mode 100644
> index 0000000..f9e4615
> --- /dev/null
> +++ b/src/mesa/state_tracker/st_shader_cache.h
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright © 2017 Timothy Arceri
> + *
> + * 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 "st_context.h"
> +#include "compiler/glsl/blob.h"
> +#include "main/mtypes.h"
> +#include "pipe/p_state.h"
> +#include "util/disk_cache.h"
> +#include "util/mesa-sha1.h"
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +bool
> +st_load_tgsi_from_disk_cache(struct gl_context *ctx,
> + struct gl_shader_program *prog);
> +
> +void
> +st_store_tgsi_in_disk_cache(struct st_context *st, struct gl_program *prog,
> + struct pipe_shader_state *out_state,
> + unsigned num_tokens);
> +
> +#ifdef __cplusplus
> +}
> +#endif
>
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