glsl: Create a standalone executable for testing optimization passes.

This patch adds a new build artifact, glsl_test, which can be used for
testing optimization passes in isolation.

I'm hoping that we will be able to add other useful standalone tests
to this executable in the future.  Accordingly, it is built in a
modular fashion: the main() function uses its first argument to
determine which test function to invoke, removes that argument from
argv[], and then calls that function to interpret the rest of the
command line arguments and perform the test.  Currently the only test
function is "optpass", which tests optimization passes.

1 files changed, 273 insertions, 0 deletions

diff --git a/src/glsl/test_optpass.cpp b/src/glsl/test_optpass.cpp
new file mode 100644
index 0000000..89b7f83
--- /dev/null
+++ b/src/glsl/test_optpass.cpp
@@ -0,0 +1,273 @@
+/*
+ * Copyright © 2011 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.
+ */
+
+/**
+ * \file test_optpass.cpp
+ *
+ * Standalone test for optimization passes.
+ *
+ * This file provides the "optpass" command for the standalone
+ * glsl_test app.  It accepts either GLSL or high-level IR as input,
+ * and performs the optimiation passes specified on the command line.
+ * It outputs the IR, both before and after optimiations.
+ */
+
+#include <string>
+#include <iostream>
+#include <sstream>
+#include <getopt.h>
+
+#include "ast.h"
+#include "ir_optimization.h"
+#include "ir_print_visitor.h"
+#include "program.h"
+#include "ir_reader.h"
+#include "standalone_scaffolding.h"
+
+using namespace std;
+
+static string read_stdin_to_eof()
+{
+   stringbuf sb;
+   cin.get(sb, '\0');
+   return sb.str();
+}
+
+static GLboolean
+do_optimization(struct exec_list *ir, const char *optimization)
+{
+   int int_0;
+   int int_1;
+   int int_2;
+   int int_3;
+   int int_4;
+
+   if (sscanf(optimization, "do_common_optimization ( %d , %d ) ",
+              &int_0, &int_1) == 2) {
+      return do_common_optimization(ir, int_0 != 0, int_1);
+   } else if (strcmp(optimization, "do_algebraic") == 0) {
+      return do_algebraic(ir);
+   } else if (strcmp(optimization, "do_constant_folding") == 0) {
+      return do_constant_folding(ir);
+   } else if (strcmp(optimization, "do_constant_variable") == 0) {
+      return do_constant_variable(ir);
+   } else if (strcmp(optimization, "do_constant_variable_unlinked") == 0) {
+      return do_constant_variable_unlinked(ir);
+   } else if (strcmp(optimization, "do_copy_propagation") == 0) {
+      return do_copy_propagation(ir);
+   } else if (strcmp(optimization, "do_copy_propagation_elements") == 0) {
+      return do_copy_propagation_elements(ir);
+   } else if (strcmp(optimization, "do_constant_propagation") == 0) {
+      return do_constant_propagation(ir);
+   } else if (strcmp(optimization, "do_dead_code") == 0) {
+      return do_dead_code(ir);
+   } else if (strcmp(optimization, "do_dead_code_local") == 0) {
+      return do_dead_code_local(ir);
+   } else if (strcmp(optimization, "do_dead_code_unlinked") == 0) {
+      return do_dead_code_unlinked(ir);
+   } else if (strcmp(optimization, "do_dead_functions") == 0) {
+      return do_dead_functions(ir);
+   } else if (strcmp(optimization, "do_function_inlining") == 0) {
+      return do_function_inlining(ir);
+   } else if (sscanf(optimization,
+                     "do_lower_jumps ( %d , %d , %d , %d , %d ) ",
+                     &int_0, &int_1, &int_2, &int_3, &int_4) == 5) {
+      return do_lower_jumps(ir, int_0 != 0, int_1 != 0, int_2 != 0,
+                            int_3 != 0, int_4 != 0);
+   } else if (strcmp(optimization, "do_lower_texture_projection") == 0) {
+      return do_lower_texture_projection(ir);
+   } else if (strcmp(optimization, "do_if_simplification") == 0) {
+      return do_if_simplification(ir);
+   } else if (strcmp(optimization, "do_discard_simplification") == 0) {
+      return do_discard_simplification(ir);
+   } else if (sscanf(optimization, "lower_if_to_cond_assign ( %d ) ",
+                     &int_0) == 1) {
+      return lower_if_to_cond_assign(ir, int_0);
+   } else if (strcmp(optimization, "do_mat_op_to_vec") == 0) {
+      return do_mat_op_to_vec(ir);
+   } else if (strcmp(optimization, "do_noop_swizzle") == 0) {
+      return do_noop_swizzle(ir);
+   } else if (strcmp(optimization, "do_structure_splitting") == 0) {
+      return do_structure_splitting(ir);
+   } else if (strcmp(optimization, "do_swizzle_swizzle") == 0) {
+      return do_swizzle_swizzle(ir);
+   } else if (strcmp(optimization, "do_tree_grafting") == 0) {
+      return do_tree_grafting(ir);
+   } else if (strcmp(optimization, "do_vec_index_to_cond_assign") == 0) {
+      return do_vec_index_to_cond_assign(ir);
+   } else if (strcmp(optimization, "do_vec_index_to_swizzle") == 0) {
+      return do_vec_index_to_swizzle(ir);
+   } else if (strcmp(optimization, "lower_discard") == 0) {
+      return lower_discard(ir);
+   } else if (sscanf(optimization, "lower_instructions ( %d ) ",
+                     &int_0) == 1) {
+      return lower_instructions(ir, int_0);
+   } else if (strcmp(optimization, "lower_noise") == 0) {
+      return lower_noise(ir);
+   } else if (sscanf(optimization, "lower_variable_index_to_cond_assign "
+                     "( %d , %d , %d , %d ) ", &int_0, &int_1, &int_2,
+                     &int_3) == 4) {
+      return lower_variable_index_to_cond_assign(ir, int_0 != 0, int_1 != 0,
+                                                 int_2 != 0, int_3 != 0);
+   } else if (sscanf(optimization, "lower_quadop_vector ( %d ) ",
+                     &int_0) == 1) {
+      return lower_quadop_vector(ir, int_0 != 0);
+   } else if (strcmp(optimization, "optimize_redundant_jumps") == 0) {
+      return optimize_redundant_jumps(ir);
+   } else {
+      printf("Unrecognized optimization %s\n", optimization);
+      exit(EXIT_FAILURE);
+      return false;
+   }
+}
+
+static GLboolean
+do_optimization_passes(struct exec_list *ir, char **optimizations,
+                       int num_optimizations, bool quiet)
+{
+   GLboolean overall_progress = false;
+
+   for (int i = 0; i < num_optimizations; ++i) {
+      const char *optimization = optimizations[i];
+      if (!quiet) {
+         printf("*** Running optimization %s...", optimization);
+      }
+      GLboolean progress = do_optimization(ir, optimization);
+      if (!quiet) {
+         printf("%s\n", progress ? "progress" : "no progress");
+      }
+      validate_ir_tree(ir);
+
+      overall_progress = overall_progress || progress;
+   }
+
+   return overall_progress;
+}
+
+int test_optpass(int argc, char **argv)
+{
+   int input_format_ir = 0; /* 0=glsl, 1=ir */
+   int loop = 0;
+   int shader_type = GL_VERTEX_SHADER;
+   int quiet = 0;
+
+   const struct option optpass_opts[] = {
+      { "input-ir", no_argument, &input_format_ir, 1 },
+      { "input-glsl", no_argument, &input_format_ir, 0 },
+      { "loop", no_argument, &loop, 1 },
+      { "vertex-shader", no_argument, &shader_type, GL_VERTEX_SHADER },
+      { "fragment-shader", no_argument, &shader_type, GL_FRAGMENT_SHADER },
+      { "quiet", no_argument, &quiet, 1 },
+      { NULL, 0, NULL, 0 }
+   };
+
+   int idx = 0;
+   int c;
+   while ((c = getopt_long(argc, argv, "", optpass_opts, &idx)) != -1) {
+      if (c != 0) {
+         printf("*** usage: %s optpass <optimizations> <options>\n", argv[0]);
+         printf("\n");
+         printf("Possible options are:\n");
+         printf("  --input-ir: input format is IR\n");
+         printf("  --input-glsl: input format is GLSL (the default)\n");
+         printf("  --loop: run optimizations repeatedly until no progress\n");
+         printf("  --vertex-shader: test with a vertex shader (the default)\n");
+         printf("  --fragment-shader: test with a fragment shader\n");
+         exit(EXIT_FAILURE);
+      }
+   }
+
+   struct gl_context local_ctx;
+   struct gl_context *ctx = &local_ctx;
+   initialize_context_to_defaults(ctx, API_OPENGL);
+
+   ctx->Driver.NewShader = _mesa_new_shader;
+
+   struct gl_shader *shader = rzalloc(NULL, struct gl_shader);
+   shader->Type = shader_type;
+
+   string input = read_stdin_to_eof();
+
+   struct _mesa_glsl_parse_state *state
+      = new(shader) _mesa_glsl_parse_state(ctx, shader->Type, shader);
+
+   if (input_format_ir) {
+      shader->ir = new(shader) exec_list;
+      _mesa_glsl_initialize_types(state);
+      _mesa_glsl_read_ir(state, shader->ir, input.c_str(), true);
+   } else {
+      shader->Source = input.c_str();
+      const char *source = shader->Source;
+      state->error = preprocess(state, &source, &state->info_log,
+                                state->extensions, ctx->API) != 0;
+
+      if (!state->error) {
+         _mesa_glsl_lexer_ctor(state, source);
+         _mesa_glsl_parse(state);
+         _mesa_glsl_lexer_dtor(state);
+      }
+
+      shader->ir = new(shader) exec_list;
+      if (!state->error && !state->translation_unit.is_empty())
+         _mesa_ast_to_hir(shader->ir, state);
+   }
+
+   /* Print out the initial IR */
+   if (!state->error && !quiet) {
+      printf("*** pre-optimization IR:\n");
+      _mesa_print_ir(shader->ir, state);
+      printf("\n--\n");
+   }
+
+   /* Optimization passes */
+   if (!state->error) {
+      GLboolean progress;
+      do {
+         progress = do_optimization_passes(shader->ir, &argv[optind],
+                                           argc - optind, quiet != 0);
+      } while (loop && progress);
+   }
+
+   /* Print out the resulting IR */
+   if (!state->error) {
+      if (!quiet) {
+         printf("*** resulting IR:\n");
+      }
+      _mesa_print_ir(shader->ir, state);
+      if (!quiet) {
+         printf("\n--\n");
+      }
+   }
+
+   if (state->error) {
+      printf("*** error(s) occurred:\n");
+      printf("%s\n", state->info_log);
+      printf("--\n");
+   }
+
+   ralloc_free(state);
+   ralloc_free(shader);
+
+   return state->error;
+}
+