Source/cmImportedCxxModuleInfo.cxx

   1 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   2    file Copyright.txt or https://cmake.org/licensing for details.  */
   3
   4 #include "cmImportedCxxModuleInfo.h"
   5
   6 #include <cstddef>
   7 #include <string>
   8 #include <utility>
   9 #include <vector>
  10
  11 #include "cmCryptoHash.h"
  12 #include "cmList.h"
  13 #include "cmStringAlgorithms.h"
  14 #include "cmSystemTools.h"
  15
  16 bool ImportedCxxModuleLookup::Initialized() const
  17 {
  18   return this->DoneInit;
  19 }
  20
  21 void ImportedCxxModuleLookup::Initialize(std::string const& importedModules)
  22 {
  23   for (auto const& entry : cmList{ importedModules }) {
  24     auto nameSep = entry.find('=');
  25     if (nameSep == std::string::npos) {
  26       // Invalid entry; ignore.
  27       continue;
  28     }
  29
  30     auto name = entry.substr(0, nameSep);
  31
  32     auto sourceSep = entry.find(',', nameSep);
  33     std::string source;
  34     if (sourceSep == std::string::npos) {
  35       source = entry.substr(nameSep + 1);
  36     } else {
  37       source = entry.substr(nameSep + 1, sourceSep - nameSep - 1);
  38     }
  39
  40     std::vector<std::string> bmis;
  41     if (sourceSep != std::string::npos) {
  42       auto bmiPaths = entry.substr(sourceSep + 1);
  43       bmis = cmSystemTools::SplitString(bmiPaths, ',');
  44     }
  45
  46     this->ImportedInfo.emplace(source,
  47                                ImportedCxxModuleInfo{ name, std::move(bmis) });
  48   }
  49
  50   this->DoneInit = true;
  51 }
  52
  53 std::string ImportedCxxModuleLookup::BmiNameForSource(std::string const& path)
  54 {
  55   auto genit = this->GeneratorInfo.find(path);
  56   if (genit != this->GeneratorInfo.end()) {
  57     return genit->second.BmiName;
  58   }
  59
  60   auto importit = this->ImportedInfo.find(path);
  61   std::string bmiName;
  62   cmCryptoHash hasher(cmCryptoHash::AlgoSHA3_512);
  63   constexpr size_t HASH_TRUNCATION = 12;
  64   if (importit != this->ImportedInfo.end()) {
  65     auto safename = hasher.HashString(importit->second.Name);
  66     bmiName = cmStrCat(safename.substr(0, HASH_TRUNCATION), ".bmi");
  67   } else {
  68     auto dirhash = hasher.HashString(path);
  69     bmiName = cmStrCat(dirhash.substr(0, HASH_TRUNCATION), ".bmi");
  70   }
  71
  72   this->GeneratorInfo.emplace(path, ImportedCxxModuleGeneratorInfo{ bmiName });
  73   return bmiName;
  74 }