mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Alessandro Di Federico
272 lines
10 KiB
C++
272 lines
10 KiB
C++
/// \file ImportModelFromCAnalysis.cpp
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/// \brief Use to edit Types by omitting rewriting of Model directly
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//
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// This file is distributed under the MIT License. See LICENSE.md for details.
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//
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#include <fstream>
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#include <string>
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#include <tuple>
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#include <vector>
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#include "llvm/Support/Error.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendAction.h"
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#include "clang/Lex/PreprocessorOptions.h"
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#include "clang/StaticAnalyzer/Frontend/FrontendActions.h"
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#include "clang/Tooling/CommonOptionsParser.h"
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#include "clang/Tooling/Tooling.h"
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#include "revng/Model/Type.h"
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#include "revng/Pipeline/Context.h"
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#include "revng/Pipeline/Kind.h"
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#include "revng/Pipeline/Option.h"
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#include "revng/Pipeline/RegisterAnalysis.h"
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#include "revng/Pipes/ModelGlobal.h"
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#include "revng/Support/PathList.h"
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#include "revng/Support/YAMLTraits.h"
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#include "revng/TupleTree/TupleTreeDiff.h"
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#include "revng-c/HeadersGeneration/ModelToHeader.h"
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#include "HeaderToModel.h"
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#include "ImportModelFromCAnalysis.h"
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#include "ImportModelFromCHelpers.h"
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using namespace llvm;
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using namespace clang;
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using namespace clang::tooling;
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static constexpr std::string_view InputCFile = "revng-input.c";
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static std::vector<std::string>
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getOptionsfromCFGFile(llvm::StringRef FilePath) {
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std::vector<std::string> Result;
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std::fstream TheFile;
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TheFile.open(FilePath.str());
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if (TheFile.is_open()) {
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std::string TheOption;
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while (getline(TheFile, TheOption)) {
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if (TheOption[0] == '-')
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Result.push_back(TheOption);
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}
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}
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return Result;
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}
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static std::optional<std::string> findHeaderFile(const std::string &File) {
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auto MaybeHeaderPath = revng::ResourceFinder.findFile(File);
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if (not MaybeHeaderPath)
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return std::nullopt;
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auto Index = (*MaybeHeaderPath).rfind('/');
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if (Index == std::string::npos)
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return std::nullopt;
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return (*MaybeHeaderPath).substr(0, Index);
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}
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struct ImportModelFromCAnalysis {
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static constexpr auto Name = "ImportModelFromC";
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constexpr static std::tuple Options = { pipeline::Option("location-to-edit",
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""),
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pipeline::Option("ccode", "") };
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std::vector<std::vector<pipeline::Kind *>> AcceptedKinds = {};
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llvm::Error
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run(pipeline::Context &Ctx, std::string LocationToEdit, std::string CCode) {
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enum ImportModelFromCOption TheOption;
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auto &Model = revng::getWritableModelFromContext(Ctx);
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// This will be used iff {Edit|Add}TypeFeature is used.
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std::optional<model::Type *> TypeToEdit;
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// This will be used iff EditFunctionPrototypeFeature is used.
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std::optional<model::Function> FunctionToBeEdited;
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if (LocationToEdit.empty()) {
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// This is the default option of the analysis.
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TheOption = ImportModelFromCOption::AddType;
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} else {
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if (auto L = pipeline::locationFromString(revng::ranks::Function,
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LocationToEdit)) {
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auto Key = std::get<0>(L->at(revng::ranks::Function));
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auto Iterator = Model->Functions().find(Key);
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if (Iterator == Model->Functions().end()) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Couldn't find the function "
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+ LocationToEdit);
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}
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FunctionToBeEdited = *Iterator;
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TheOption = ImportModelFromCOption::EditFunctionPrototype;
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} else if (auto L = pipeline::locationFromString(revng::ranks::Type,
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LocationToEdit)) {
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auto Key = std::get<0>(L->at(revng::ranks::Type));
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auto TypeKind = std::get<1>(L->at(revng::ranks::Type));
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auto Iterator = Model->Types().find({ Key, TypeKind });
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if (Iterator == Model->Types().end()) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Couldn't find the type "
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+ LocationToEdit);
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}
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TypeToEdit = Iterator->get();
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TheOption = ImportModelFromCOption::EditType;
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} else {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Invalid location");
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}
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}
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// Create a temporary directory for the filtered model's header file.
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llvm::SmallString<128> TemporaryDir;
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llvm::sys::fs::createUniqueDirectory("revng-filtered-model", TemporaryDir);
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constexpr std::string_view FilteredModelHeaderAsPTML = "filtered-model-"
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"header-ptml.h";
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llvm::SmallString<160> FilterModelPath;
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llvm::sys::path::append(FilterModelPath,
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TemporaryDir.str().str(),
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FilteredModelHeaderAsPTML);
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std::error_code EC;
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llvm::raw_fd_ostream Header(FilterModelPath.str().str(), EC);
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if (EC) {
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return llvm::createStringError(EC,
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"Couldn't create the file for "
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"filtered-model-header-ptml.h: "
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+ EC.message());
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}
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ModelToHeaderOptions Options;
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Options.GeneratePlainC = true;
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if (TheOption == ImportModelFromCOption::EditType) {
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// For all the types other than functions and typedefs, generate forward
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// declarations.
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if (not isa<model::RawFunctionType>(*TypeToEdit)
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and not isa<model::CABIFunctionType>(*TypeToEdit)
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and not isa<model::TypedefType>(*TypeToEdit)) {
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llvm::raw_string_ostream Stream(Options.PostIncludes);
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ptml::PTMLCBuilder ThePTMLCBuilder(true);
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ptml::PTMLIndentedOstream ThePTMLStream(Stream, 4, true);
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Stream << ThePTMLCBuilder.getLineComment("The type we are editing");
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// The definition of this type will be at the end of the file.
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printForwardDeclaration(**TypeToEdit, ThePTMLStream, ThePTMLCBuilder);
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Stream << '\n';
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}
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// Find all types whose definition depends on the type we are editing.
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Options.TypesToOmit = populateDependencies(*TypeToEdit, Model);
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} else if (TheOption == ImportModelFromCOption::EditFunctionPrototype) {
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Options.FunctionsToOmit.insert(FunctionToBeEdited->Entry());
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} else {
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revng_assert(TheOption == ImportModelFromCOption::AddType);
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// We have nothing to ignore
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}
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dumpModelToHeader(*Model, Header, Options);
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Header.close();
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std::string FilteredHeader = std::string("#include \"")
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+ FilterModelPath.str().str()
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+ std::string("\"");
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TupleTree<model::Binary> OutModel(Model);
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std::optional<revng::ParseCCodeError> Error;
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std::unique_ptr<HeaderToModelAction> Action;
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if (TheOption == ImportModelFromCOption::EditType) {
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Action = std::make_unique<HeaderToModelEditTypeAction>(OutModel,
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Error,
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TypeToEdit);
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} else if (TheOption == ImportModelFromCOption::EditFunctionPrototype) {
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using EditFunctionPrototype = HeaderToModelEditFunctionAction;
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Action = std::make_unique<EditFunctionPrototype>(OutModel,
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Error,
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FunctionToBeEdited);
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} else {
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Action = std::make_unique<HeaderToModelAddTypeAction>(OutModel, Error);
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}
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// Find compile flags to be applied to clang.
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StringRef CompileFlagsPath = "share/revng-c/compile-flags.cfg";
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auto MaybeCompileCFGPath = revng::ResourceFinder.findFile(CompileFlagsPath);
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if (not MaybeCompileCFGPath) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Couldn't find compile-flags.cfg");
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}
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// Since the `--config` is just a clang Driver option, we need to parse it
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// manually.
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auto FromCFGFile = getOptionsfromCFGFile(*MaybeCompileCFGPath);
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std::vector<std::string> Compilation(FromCFGFile);
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Compilation.push_back("-xc");
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SmallString<16> CompilerHeadersPath;
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{
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StringRef LLVMLibrary = getLibrariesFullPath().at("libLLVMSupport");
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using namespace llvm::sys::path;
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SmallString<16> ClangPath;
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append(ClangPath, parent_path(parent_path(LLVMLibrary)));
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append(ClangPath, Twine("bin"));
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append(ClangPath, Twine("clang"));
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CompilerHeadersPath = clang::driver::Driver::GetResourcesPath(ClangPath);
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append(CompilerHeadersPath, Twine("include"));
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}
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Compilation.push_back("-I" + CompilerHeadersPath.str().str());
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// Find revng-primitive-types.h and revng-attributes.h.
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const char *PrimitivesHeader = "share/revng-c/include/"
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"revng-primitive-types.h";
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auto MaybePrimitiveHeaderPath = findHeaderFile(PrimitivesHeader);
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if (not MaybePrimitiveHeaderPath) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Couldn't find revng-primitive-types.h");
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}
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Compilation.push_back("-I" + *MaybePrimitiveHeaderPath);
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FilteredHeader += "\n";
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FilteredHeader += CCode;
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if (not clang::tooling::runToolOnCodeWithArgs(std::move(Action),
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FilteredHeader,
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Compilation,
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InputCFile)) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"Unable to run clang");
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}
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// Check if an error was reported by clang or revng during parsing of C
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// code.
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if (Error) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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(*Error).ErrorMessage);
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}
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model::VerifyHelper VH(false);
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if (not OutModel->verify(VH)) {
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return llvm::createStringError(llvm::inconvertibleErrorCode(),
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"New model does not verify: "
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+ VH.getReason());
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}
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// Replace the original Model with the OutModel that contains the changes.
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Model = OutModel;
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return llvm::Error::success();
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}
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};
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pipeline::RegisterAnalysis<ImportModelFromCAnalysis> ImportModelFromCReg;
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