src/tools/gn/header_checker_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <vector>
   6
   7 #include "testing/gtest/include/gtest/gtest.h"
   8 #include "tools/gn/config.h"
   9 #include "tools/gn/header_checker.h"
  10 #include "tools/gn/scheduler.h"
  11 #include "tools/gn/target.h"
  12 #include "tools/gn/test_with_scope.h"
  13
  14 namespace {
  15
  16 class HeaderCheckerTest : public testing::Test {
  17  public:
  18   HeaderCheckerTest()
  19       : a_(setup_.settings(), Label(SourceDir("//a/"), "a")),
  20         b_(setup_.settings(), Label(SourceDir("//b/"), "a")),
  21         c_(setup_.settings(), Label(SourceDir("//c/"), "c")),
  22         d_(setup_.settings(), Label(SourceDir("//d/"), "d")) {
  23     a_.deps().push_back(LabelTargetPair(&b_));
  24     b_.deps().push_back(LabelTargetPair(&c_));
  25
  26     // Start with all public visibility.
  27     a_.visibility().SetPublic();
  28     b_.visibility().SetPublic();
  29     c_.visibility().SetPublic();
  30     d_.visibility().SetPublic();
  31
  32     targets_.push_back(&a_);
  33     targets_.push_back(&b_);
  34     targets_.push_back(&c_);
  35     targets_.push_back(&d_);
  36   }
  37
  38  protected:
  39   Scheduler scheduler_;
  40
  41   TestWithScope setup_;
  42
  43   // Some headers that are automatically set up with a dependency chain.
  44   // a -> b -> c
  45   Target a_;
  46   Target b_;
  47   Target c_;
  48   Target d_;
  49
  50   std::vector<const Target*> targets_;
  51 };
  52
  53 }  // namespace
  54
  55 TEST_F(HeaderCheckerTest, IsDependencyOf) {
  56   scoped_refptr<HeaderChecker> checker(
  57       new HeaderChecker(setup_.build_settings(), targets_));
  58
  59   std::vector<const Target*> chain;
  60   EXPECT_FALSE(checker->IsDependencyOf(&a_, &a_, false, &chain, NULL));
  61
  62   chain.clear();
  63   EXPECT_TRUE(checker->IsDependencyOf(&b_, &a_, false, &chain, NULL));
  64   ASSERT_EQ(2u, chain.size());
  65   EXPECT_EQ(&b_, chain[0]);
  66   EXPECT_EQ(&a_, chain[1]);
  67
  68   chain.clear();
  69   EXPECT_TRUE(checker->IsDependencyOf(&c_, &a_, false, &chain, NULL));
  70   ASSERT_EQ(3u, chain.size());
  71   EXPECT_EQ(&c_, chain[0]);
  72   EXPECT_EQ(&b_, chain[1]);
  73   EXPECT_EQ(&a_, chain[2]);
  74
  75   chain.clear();
  76   EXPECT_FALSE(checker->IsDependencyOf(&a_, &c_, false, &chain, NULL));
  77   EXPECT_TRUE(chain.empty());
  78
  79   // If an a -> c dependency exists, this should be chosen for the chain.
  80   chain.clear();
  81   a_.deps().push_back(LabelTargetPair(&c_));
  82   EXPECT_TRUE(checker->IsDependencyOf(&c_, &a_, false, &chain, NULL));
  83   EXPECT_EQ(&c_, chain[0]);
  84   EXPECT_EQ(&a_, chain[1]);
  85 }
  86
  87 TEST_F(HeaderCheckerTest, IsDependencyOf_ForwardsDirectDependentConfigs) {
  88   scoped_refptr<HeaderChecker> checker(
  89       new HeaderChecker(setup_.build_settings(), targets_));
  90
  91   // The a -> b -> c chain is found, since no chains that forward direct-
  92   // dependent configs exist.
  93   std::vector<const Target*> chain;
  94   bool direct_dependent_configs_apply = false;
  95   EXPECT_TRUE(checker->IsDependencyOf(
  96       &c_, &a_, true, &chain, &direct_dependent_configs_apply));
  97   EXPECT_FALSE(direct_dependent_configs_apply);
  98   EXPECT_EQ(3u, chain.size());
  99   EXPECT_EQ(&c_, chain[0]);
 100   EXPECT_EQ(&b_, chain[1]);
 101   EXPECT_EQ(&a_, chain[2]);
 102
 103   // Create a chain a -> d -> c where d forwards direct-dependent configs.
 104   // This path should be preferred when dependency chains which forward
 105   // direct-dependent configs are preferred.
 106   chain.clear();
 107   direct_dependent_configs_apply = false;
 108   d_.deps().push_back(LabelTargetPair(&c_));
 109   d_.forward_dependent_configs().push_back(LabelTargetPair(&c_));
 110   a_.deps().push_back(LabelTargetPair(&d_));
 111   EXPECT_TRUE(checker->IsDependencyOf(
 112       &c_, &a_, true, &chain, &direct_dependent_configs_apply));
 113   EXPECT_TRUE(direct_dependent_configs_apply);
 114   EXPECT_EQ(3u, chain.size());
 115   EXPECT_EQ(&c_, chain[0]);
 116   EXPECT_EQ(&d_, chain[1]);
 117   EXPECT_EQ(&a_, chain[2]);
 118
 119   // d also forwards direct-dependent configs if it is a group.
 120   chain.clear();
 121   direct_dependent_configs_apply = false;
 122   d_.set_output_type(Target::GROUP);
 123   d_.forward_dependent_configs().clear();
 124   EXPECT_TRUE(checker->IsDependencyOf(
 125       &c_, &a_, true, &chain, &direct_dependent_configs_apply));
 126   EXPECT_TRUE(direct_dependent_configs_apply);
 127   EXPECT_EQ(3u, chain.size());
 128   EXPECT_EQ(&c_, chain[0]);
 129   EXPECT_EQ(&d_, chain[1]);
 130   EXPECT_EQ(&a_, chain[2]);
 131
 132   // A direct dependency a -> c carries direct-dependent configs.
 133   chain.clear();
 134   direct_dependent_configs_apply = false;
 135   a_.deps().push_back(LabelTargetPair(&c_));
 136   EXPECT_TRUE(checker->IsDependencyOf(
 137       &c_, &a_, true, &chain, &direct_dependent_configs_apply));
 138   EXPECT_TRUE(direct_dependent_configs_apply);
 139   EXPECT_EQ(2u, chain.size());
 140   EXPECT_EQ(&c_, chain[0]);
 141   EXPECT_EQ(&a_, chain[1]);
 142 }
 143
 144 TEST_F(HeaderCheckerTest, CheckInclude) {
 145   InputFile input_file(SourceFile("//some_file.cc"));
 146   input_file.SetContents(std::string());
 147   LocationRange range;  // Dummy value.
 148
 149   // Add a disconnected target d with a header to check that you have to have
 150   // to depend on a target listing a header.
 151   SourceFile d_header("//d_header.h");
 152   d_.sources().push_back(SourceFile(d_header));
 153
 154   // Add a header on B and say everything in B is public.
 155   SourceFile b_public("//b_public.h");
 156   b_.sources().push_back(b_public);
 157   c_.set_all_headers_public(true);
 158
 159   // Add a public and private header on C.
 160   SourceFile c_public("//c_public.h");
 161   SourceFile c_private("//c_private.h");
 162   c_.sources().push_back(c_private);
 163   c_.public_headers().push_back(c_public);
 164   c_.set_all_headers_public(false);
 165
 166   targets_.push_back(&d_);
 167   scoped_refptr<HeaderChecker> checker(
 168       new HeaderChecker(setup_.build_settings(), targets_));
 169
 170   // A file in target A can't include a header from D because A has no
 171   // dependency on D.
 172   Err err;
 173   EXPECT_FALSE(checker->CheckInclude(&a_, input_file, d_header, range, &err));
 174   EXPECT_TRUE(err.has_error());
 175
 176   // A can include the public header in B.
 177   err = Err();
 178   EXPECT_TRUE(checker->CheckInclude(&a_, input_file, b_public, range, &err));
 179   EXPECT_FALSE(err.has_error());
 180
 181   // Check A depending on the public and private headers in C.
 182   err = Err();
 183   EXPECT_TRUE(checker->CheckInclude(&a_, input_file, c_public, range, &err));
 184   EXPECT_FALSE(err.has_error());
 185   EXPECT_FALSE(checker->CheckInclude(&a_, input_file, c_private, range, &err));
 186   EXPECT_TRUE(err.has_error());
 187
 188   // A can depend on a random file unknown to the build.
 189   err = Err();
 190   EXPECT_TRUE(checker->CheckInclude(&a_, input_file, SourceFile("//random.h"),
 191                                     range, &err));
 192   EXPECT_FALSE(err.has_error());
 193
 194   // If C is not visible from A, A can't include public headers even if there
 195   // is a dependency path.
 196   c_.visibility().SetPrivate(c_.label().dir());
 197   err = Err();
 198   EXPECT_FALSE(checker->CheckInclude(&a_, input_file, c_public, range, &err));
 199   EXPECT_TRUE(err.has_error());
 200   c_.visibility().SetPublic();
 201
 202   // If C has direct-dependent configs, then B must forward them to A.
 203   // If B is a group, that suffices to forward direct-dependent configs.
 204   {
 205     Config direct(setup_.settings(), Label(SourceDir("//c/"), "config"));
 206     direct.config_values().cflags().push_back("-DSOME_DEFINE");
 207
 208     c_.direct_dependent_configs().push_back(LabelConfigPair(&direct));
 209     err = Err();
 210     EXPECT_FALSE(checker->CheckInclude(&a_, input_file, c_public, range, &err));
 211     EXPECT_TRUE(err.has_error());
 212
 213     b_.forward_dependent_configs().push_back(LabelTargetPair(&c_));
 214     err = Err();
 215     EXPECT_TRUE(checker->CheckInclude(&a_, input_file, c_public, range, &err));
 216     EXPECT_FALSE(err.has_error());
 217
 218     b_.forward_dependent_configs().clear();
 219     b_.set_output_type(Target::GROUP);
 220     err = Err();
 221     EXPECT_TRUE(checker->CheckInclude(&a_, input_file, c_public, range, &err));
 222     EXPECT_FALSE(err.has_error());
 223
 224     b_.set_output_type(Target::UNKNOWN);
 225     c_.direct_dependent_configs().clear();
 226   }
 227 }
 228
 229 TEST_F(HeaderCheckerTest, GetDependentConfigChainProblemIndex) {
 230   // Assume we have a chain A -> B -> C -> D.
 231   Target target_a(setup_.settings(), Label(SourceDir("//a/"), "a"));
 232   Target target_b(setup_.settings(), Label(SourceDir("//b/"), "b"));
 233   Target target_c(setup_.settings(), Label(SourceDir("//c/"), "c"));
 234   Target target_d(setup_.settings(), Label(SourceDir("//d/"), "d"));
 235
 236   // C is a group, and B forwards deps from C, so A should get configs from D.
 237   target_a.set_output_type(Target::SOURCE_SET);
 238   target_b.set_output_type(Target::SOURCE_SET);
 239   target_c.set_output_type(Target::GROUP);
 240   target_d.set_output_type(Target::SOURCE_SET);
 241   target_b.forward_dependent_configs().push_back(
 242       LabelTargetPair(&target_c));
 243
 244   // Dependency chain goes from bottom to top.
 245   std::vector<const Target*> chain;
 246   chain.push_back(&target_d);
 247   chain.push_back(&target_c);
 248   chain.push_back(&target_b);
 249   chain.push_back(&target_a);
 250
 251   // If C is not a group, it shouldn't work anymore.
 252   target_c.set_output_type(Target::SOURCE_SET);
 253   EXPECT_EQ(1u, HeaderChecker::GetDependentConfigChainProblemIndex(chain));
 254
 255   // Or if B stops forwarding from C, it shouldn't work anymore.
 256   target_c.set_output_type(Target::GROUP);
 257   target_b.forward_dependent_configs().clear();
 258   EXPECT_EQ(2u, HeaderChecker::GetDependentConfigChainProblemIndex(chain));
 259 }