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Diffstat (limited to 'src/deps.cc')
| -rw-r--r-- | src/deps.cc | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/deps.cc b/src/deps.cc new file mode 100644 index 0000000..599be8c --- /dev/null +++ b/src/deps.cc @@ -0,0 +1,194 @@ +// -*- c++ -*- +// Distributed under the BSD 2-Clause License. +// See accompanying file LICENSE for details. +#include "deps.h" + +#include "util.h" + +#include <nlohmann/json.hpp> + +#include <fstream> + +namespace { +/* Format example: +build/src/libctor_a-libctor_cc.o: src/libctor.cc \ + src/getoptpp/getoptpp.hpp src/ctor.h src/configure.h src/rebuild.h \ + src/A\ B\ C.h src/task.h src/build.h src/unittest.h + */ +std::vector<std::string> readDepsMake(const std::string& dep_file) +{ + auto str = readFile(dep_file); + + std::vector<std::string> output; + std::string tmp; + + enum class State + { + pre_colon, + post_colon, + in_escape, + } state{State::pre_colon}; + + auto old_state{state}; + for(const auto& c : str) + { + if(c == '\r') + { + // just always ignore windows extra newline char + continue; + } + + switch(state) + { + case State::pre_colon: + if(c == ':') // ignore everything until the colon + { + state = State::post_colon; + continue; + } + continue; + + case State::post_colon: + if(c == '\n') + { + // done + if(!tmp.empty()) + { + output.emplace_back(tmp); + } + return output; + } + if(c == '\\') + { + old_state = state; + state = State::in_escape; + continue; + } + if(c == '\t' || c == ' ') // new token + { + if(!tmp.empty()) + { + output.emplace_back(tmp); + } + tmp.clear(); + continue; + } + break; + + case State::in_escape: + if(c == '\n') + { + // linewrap + state = old_state; + continue; + } + state = old_state; + break; + } + + tmp += c; + } + + if(!tmp.empty()) + { + output.emplace_back(tmp); + } + + return output; +} + +// https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1689r5.html +// https://devblogs.microsoft.com/cppblog/introducing-source-dependency-reporting-with-msvc-in-visual-studio-2019-version-16-7/ +/* Format examples: +{ + "Version": "1.1", + "Data": { + "Source": "z:\\home\\deva\\docs\\c\\ctor\\src\\libctor.cc", + "ProvidedModule": "", + "Includes": [ + "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vector", + "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\yvals_core.h", + "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vcruntime.h", +. +. +. + "z:\\home\\deva\\docs\\c\\ctor\\src\\unittest.h" + ], + "ImportedModules": [], + "ImportedHeaderUnits": [] + } +} +*/ +/* +{ + "Version": "1.2", + "Data": { + "Source": "c:\\jenkins\\workspace\\ctor-linux64\\src\\build.cc", + "ProvidedModule": "", + "Includes": [ + "c:\\jenkins\\workspace\\ctor-linux64\\src\\build.h", + "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\string", + "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\yvals_core.h", +. +. +. + "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\iostream" + ], + "ImportedModules": [], + "ImportedHeaderUnits": [] + } +} +*/ + +std::vector<std::string> readDepsJson(const std::string& dep_file) +{ + std::ifstream stream(dep_file); + auto json = nlohmann::json::parse(stream); + for(const auto& [key, value] : json.items()) + { + if(key == "Data" && value.is_object()) + { + for(const auto& [inner_key, inner_value] : value.items()) + { + if(inner_key == "Includes" && inner_value.is_array()) + { + std::vector<std::string> deps; + for(const auto& dep : inner_value) + { + deps.emplace_back(dep); + } + return deps; + } + } + } + } + return {}; +} +} + +std::vector<std::string> readDeps(const std::string& dep_file, + ctor::toolchain toolchain) +{ + if(!std::filesystem::exists(dep_file)) + { + return {}; + } + + switch(toolchain) + { + case ctor::toolchain::any: + case ctor::toolchain::none: + return {}; + + // json based: + case ctor::toolchain::msvc: + return readDepsJson(dep_file); + + // makefile .d file based: + case ctor::toolchain::gcc: + case ctor::toolchain::clang: + return readDepsMake(dep_file); + } + + return {}; +} |