summaryrefslogtreecommitdiff
path: root/Source/cmGeneratorExpression.h
blob: fd36c4bcb0b129ee1930fef4992c5dab7e374d08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#ifndef cmGeneratorExpression_h
#define cmGeneratorExpression_h

#include "cmConfigure.h" // IWYU pragma: keep

#include "cmListFileCache.h"

#include <map>
#include <memory> // IWYU pragma: keep
#include <set>
#include <string>
#include <utility>
#include <vector>

class cmCompiledGeneratorExpression;
class cmGeneratorTarget;
class cmLocalGenerator;
struct cmGeneratorExpressionContext;
struct cmGeneratorExpressionDAGChecker;
struct cmGeneratorExpressionEvaluator;

/** \class cmGeneratorExpression
 * \brief Evaluate generate-time query expression syntax.
 *
 * cmGeneratorExpression instances are used by build system generator
 * implementations to evaluate the $<> generator expression syntax.
 * Generator expressions are evaluated just before the generate step
 * writes strings into the build system.  They have knowledge of the
 * build configuration which is not available at configure time.
 */
class cmGeneratorExpression
{
public:
  /** Construct. */
  cmGeneratorExpression(cmListFileBacktrace backtrace = cmListFileBacktrace());
  ~cmGeneratorExpression();

  cmGeneratorExpression(cmGeneratorExpression const&) = delete;
  cmGeneratorExpression& operator=(cmGeneratorExpression const&) = delete;

  std::unique_ptr<cmCompiledGeneratorExpression> Parse(
    std::string const& input);
  std::unique_ptr<cmCompiledGeneratorExpression> Parse(const char* input);

  enum PreprocessContext
  {
    StripAllGeneratorExpressions,
    BuildInterface,
    InstallInterface
  };

  static std::string Preprocess(const std::string& input,
                                PreprocessContext context,
                                bool resolveRelative = false);

  static void Split(const std::string& input,
                    std::vector<std::string>& output);

  static std::string::size_type Find(const std::string& input);

  static bool IsValidTargetName(const std::string& input);

  static std::string StripEmptyListElements(const std::string& input);

  static inline bool StartsWithGeneratorExpression(const std::string& input)
  {
    return input.length() >= 2 && input[0] == '$' && input[1] == '<';
  }
  static inline bool StartsWithGeneratorExpression(const char* input)
  {
    return input != nullptr && input[0] == '$' && input[1] == '<';
  }

private:
  cmListFileBacktrace Backtrace;
};

class cmCompiledGeneratorExpression
{
public:
  ~cmCompiledGeneratorExpression();

  cmCompiledGeneratorExpression(cmCompiledGeneratorExpression const&) = delete;
  cmCompiledGeneratorExpression& operator=(
    cmCompiledGeneratorExpression const&) = delete;

  const std::string& Evaluate(
    cmLocalGenerator* lg, const std::string& config, bool quiet = false,
    cmGeneratorTarget const* headTarget = nullptr,
    cmGeneratorTarget const* currentTarget = nullptr,
    cmGeneratorExpressionDAGChecker* dagChecker = nullptr,
    std::string const& language = std::string()) const;
  const std::string& Evaluate(
    cmLocalGenerator* lg, const std::string& config, bool quiet,
    cmGeneratorTarget const* headTarget,
    cmGeneratorExpressionDAGChecker* dagChecker,
    std::string const& language = std::string()) const;

  /** Get set of targets found during evaluations.  */
  std::set<cmGeneratorTarget*> const& GetTargets() const
  {
    return this->DependTargets;
  }

  std::set<std::string> const& GetSeenTargetProperties() const
  {
    return this->SeenTargetProperties;
  }

  std::set<cmGeneratorTarget const*> const& GetAllTargetsSeen() const
  {
    return this->AllTargetsSeen;
  }

  std::string const& GetInput() const { return this->Input; }

  cmListFileBacktrace GetBacktrace() const { return this->Backtrace; }
  bool GetHadContextSensitiveCondition() const
  {
    return this->HadContextSensitiveCondition;
  }
  bool GetHadHeadSensitiveCondition() const
  {
    return this->HadHeadSensitiveCondition;
  }
  std::set<cmGeneratorTarget const*> GetSourceSensitiveTargets() const
  {
    return this->SourceSensitiveTargets;
  }

  void SetEvaluateForBuildsystem(bool eval)
  {
    this->EvaluateForBuildsystem = eval;
  }

  void GetMaxLanguageStandard(cmGeneratorTarget const* tgt,
                              std::map<std::string, std::string>& mapping);

private:
  const std::string& EvaluateWithContext(
    cmGeneratorExpressionContext& context,
    cmGeneratorExpressionDAGChecker* dagChecker) const;

  cmCompiledGeneratorExpression(cmListFileBacktrace backtrace,
                                std::string input);

  friend class cmGeneratorExpression;

  cmListFileBacktrace Backtrace;
  std::vector<cmGeneratorExpressionEvaluator*> Evaluators;
  const std::string Input;
  bool NeedsEvaluation;

  mutable std::set<cmGeneratorTarget*> DependTargets;
  mutable std::set<cmGeneratorTarget const*> AllTargetsSeen;
  mutable std::set<std::string> SeenTargetProperties;
  mutable std::map<cmGeneratorTarget const*,
                   std::map<std::string, std::string>>
    MaxLanguageStandard;
  mutable std::string Output;
  mutable bool HadContextSensitiveCondition;
  mutable bool HadHeadSensitiveCondition;
  mutable std::set<cmGeneratorTarget const*> SourceSensitiveTargets;
  bool EvaluateForBuildsystem;
};

class cmGeneratorExpressionInterpreter
{
public:
  cmGeneratorExpressionInterpreter(cmLocalGenerator* localGenerator,
                                   std::string config,
                                   cmGeneratorTarget const* headTarget,
                                   std::string lang = std::string())
    : LocalGenerator(localGenerator)
    , Config(std::move(config))
    , HeadTarget(headTarget)
    , Language(std::move(lang))
  {
  }

  cmGeneratorExpressionInterpreter(cmGeneratorExpressionInterpreter const&) =
    delete;
  cmGeneratorExpressionInterpreter& operator=(
    cmGeneratorExpressionInterpreter const&) = delete;

  const std::string& Evaluate(const char* expression,
                              const std::string& property);
  const std::string& Evaluate(const std::string& expression,
                              const std::string& property)
  {
    return this->Evaluate(expression.c_str(), property);
  }

protected:
  cmGeneratorExpression GeneratorExpression;
  std::unique_ptr<cmCompiledGeneratorExpression> CompiledGeneratorExpression;
  cmLocalGenerator* LocalGenerator = nullptr;
  std::string Config;
  cmGeneratorTarget const* HeadTarget = nullptr;
  std::string Language;
};

#endif