kc3-lang/angle/src/tests/compiler_tests/PrunePureLiteralStatements_test.cpp

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• Author : Corentin Wallez
  Date : 2017-04-06 14:34:43
  Hash : e839078e
  Message : compiler: Prune literal statements when outputting ESSL The ESSL output doesn't have a default precision for floats, this causes float literal statements to not have any precision defined, which is an error. We fix this by removing literal statements as they are dead code anyway. BUG=angleproject:1967 Change-Id: I498f4f8495f854240ee8a2182415bf982c5166a4 Reviewed-on: https://chromium-review.googlesource.com/470268 Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Commit-Queue: Corentin Wallez <cwallez@chromium.org>

• src/tests/compiler_tests/PrunePureLiteralStatements_test.cpp

• //
  // Copyright (c) 2017 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // PrunePureLiteralStatements_test.cpp:
  //   Tests for pruning literal statements.
  //
  
  #include "angle_gl.h"
  #include "gtest/gtest.h"
  #include "tests/test_utils/compiler_test.h"
  
  using namespace sh;
  
  namespace
  {
  
  class PrunePureLiteralStatementsTest : public MatchOutputCodeTest
  {
    public:
      // The PrunePureLiteralStatements pass is used when outputting ESSL
      PrunePureLiteralStatementsTest() : MatchOutputCodeTest(GL_FRAGMENT_SHADER, 0, SH_ESSL_OUTPUT) {}
  };
  
  // Most basic test for the pruning
  TEST_F(PrunePureLiteralStatementsTest, FloatLiteralStatement)
  {
      const std::string shaderString =
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "   float f = 41.0;\n"
          "   42.0;\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("41"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test the pruning works for constructed types too
  TEST_F(PrunePureLiteralStatementsTest, ConstructorLiteralStatement)
  {
      const std::string shaderString =
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "   vec2 f = vec2(41.0, 41.0);\n"
          "   vec2(42.0, 42.0);\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("41"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test the pruning works when the literal is a (non-trivial) expression
  TEST_F(PrunePureLiteralStatementsTest, ExpressionLiteralStatement)
  {
      const std::string shaderString =
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "   vec2(21.0, 21.0) + vec2(21.0, 21.0);\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(notFoundInCode("21"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test that the pruning happens in the for-loop expression too
  TEST_F(PrunePureLiteralStatementsTest, ForLoopLiteralExpression)
  {
      const std::string shaderString =
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "    for (;; vec2(42.0, 42.0)) {}\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test that the pruning correctly handles the pruning inside switch statements - for a switch with
  // one empty case.
  TEST_F(PrunePureLiteralStatementsTest, SwitchLiteralExpressionEmptyCase)
  {
      const std::string shaderString =
          "#version 300 es\n"
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "    switch(1)\n"
          "    {\n"
          "      default:\n"
          "        42;\n"
          "    }\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(notFoundInCode("default"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test that the pruning correctly handles the pruning inside switch statements - for a switch with
  // multiple cases.
  TEST_F(PrunePureLiteralStatementsTest, SwitchLiteralExpressionEmptyCases)
  {
      const std::string shaderString =
          "#version 300 es\n"
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "    switch(1)\n"
          "    {\n"
          "      case 1:\n"
          "      case 2:\n"
          "      default:\n"
          "        42;\n"
          "    }\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(notFoundInCode("default"));
      ASSERT_TRUE(notFoundInCode("case"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test that the pruning correctly handles the pruning inside switch statements - only cases at the
  // end are deleted
  TEST_F(PrunePureLiteralStatementsTest, SwitchLiteralExpressionOnlyLastCase)
  {
      const std::string shaderString =
          "#version 300 es\n"
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "    switch(1)\n"
          "    {\n"
          "      case 1:\n"
          "      default:\n"
          "        42;\n"
          "        break;\n"
          "    }\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(foundInCode("default"));
      ASSERT_TRUE(foundInCode("case"));
      ASSERT_TRUE(notFoundInCode("42"));
  }
  
  // Test that the pruning correctly handles the pruning inside switch statements - pruning isn't stopped by literal statements
  TEST_F(PrunePureLiteralStatementsTest, SwitchLiteralExpressionLiteralDoesntStop)
  {
      const std::string shaderString =
          "#version 300 es\n"
          "precision mediump float;\n"
          "void main()\n"
          "{\n"
          "    switch(1)\n"
          "    {\n"
          "      case 1:\n"
          "        42;\n"
          "      case 2:\n"
          "        43;\n"
          "    }\n"
          "}\n";
      compile(shaderString);
      ASSERT_TRUE(notFoundInCode("case"));
      ASSERT_TRUE(notFoundInCode("42"));
      ASSERT_TRUE(notFoundInCode("43"));
  }
  
  }  // namespace