691 lines
22 KiB
C++
691 lines
22 KiB
C++
//===-- ClangModulesDeclVendor.cpp ------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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// C++ Includes
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#include <mutex>
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// Other libraries and framework includes
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/FrontendActions.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Lex/PreprocessorOptions.h"
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#include "clang/Parse/Parser.h"
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#include "clang/Sema/Lookup.h"
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#include "clang/Serialization/ASTReader.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Threading.h"
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// Project includes
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#include "ClangModulesDeclVendor.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Symbol/CompileUnit.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Utility/FileSpec.h"
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#include "lldb/Utility/LLDBAssert.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/StreamString.h"
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using namespace lldb_private;
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namespace {
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// Any Clang compiler requires a consumer for diagnostics. This one stores them
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// as strings
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// so we can provide them to the user in case a module failed to load.
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class StoringDiagnosticConsumer : public clang::DiagnosticConsumer {
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public:
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StoringDiagnosticConsumer();
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void HandleDiagnostic(clang::DiagnosticsEngine::Level DiagLevel,
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const clang::Diagnostic &info) override;
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void ClearDiagnostics();
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void DumpDiagnostics(Stream &error_stream);
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private:
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typedef std::pair<clang::DiagnosticsEngine::Level, std::string>
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IDAndDiagnostic;
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std::vector<IDAndDiagnostic> m_diagnostics;
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Log *m_log;
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};
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// The private implementation of our ClangModulesDeclVendor. Contains all the
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// Clang state required
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// to load modules.
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class ClangModulesDeclVendorImpl : public ClangModulesDeclVendor {
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public:
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ClangModulesDeclVendorImpl(
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llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine> diagnostics_engine,
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std::shared_ptr<clang::CompilerInvocation> compiler_invocation,
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std::unique_ptr<clang::CompilerInstance> compiler_instance,
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std::unique_ptr<clang::Parser> parser);
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~ClangModulesDeclVendorImpl() override = default;
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bool AddModule(ModulePath &path, ModuleVector *exported_modules,
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Stream &error_stream) override;
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bool AddModulesForCompileUnit(CompileUnit &cu, ModuleVector &exported_modules,
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Stream &error_stream) override;
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uint32_t FindDecls(const ConstString &name, bool append, uint32_t max_matches,
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std::vector<clang::NamedDecl *> &decls) override;
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void ForEachMacro(const ModuleVector &modules,
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std::function<bool(const std::string &)> handler) override;
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clang::ExternalASTMerger::ImporterSource GetImporterSource() override;
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private:
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void
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ReportModuleExportsHelper(std::set<ClangModulesDeclVendor::ModuleID> &exports,
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clang::Module *module);
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void ReportModuleExports(ModuleVector &exports, clang::Module *module);
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clang::ModuleLoadResult DoGetModule(clang::ModuleIdPath path,
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bool make_visible);
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bool m_enabled = false;
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llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine> m_diagnostics_engine;
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std::shared_ptr<clang::CompilerInvocation> m_compiler_invocation;
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std::unique_ptr<clang::CompilerInstance> m_compiler_instance;
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std::unique_ptr<clang::Parser> m_parser;
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size_t m_source_location_index =
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0; // used to give name components fake SourceLocations
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typedef std::vector<ConstString> ImportedModule;
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typedef std::map<ImportedModule, clang::Module *> ImportedModuleMap;
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typedef std::set<ModuleID> ImportedModuleSet;
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ImportedModuleMap m_imported_modules;
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ImportedModuleSet m_user_imported_modules;
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const clang::ExternalASTMerger::OriginMap m_origin_map;
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};
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} // anonymous namespace
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StoringDiagnosticConsumer::StoringDiagnosticConsumer() {
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m_log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS);
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}
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void StoringDiagnosticConsumer::HandleDiagnostic(
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clang::DiagnosticsEngine::Level DiagLevel, const clang::Diagnostic &info) {
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llvm::SmallVector<char, 256> diagnostic_string;
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info.FormatDiagnostic(diagnostic_string);
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m_diagnostics.push_back(
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IDAndDiagnostic(DiagLevel, std::string(diagnostic_string.data(),
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diagnostic_string.size())));
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}
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void StoringDiagnosticConsumer::ClearDiagnostics() { m_diagnostics.clear(); }
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void StoringDiagnosticConsumer::DumpDiagnostics(Stream &error_stream) {
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for (IDAndDiagnostic &diag : m_diagnostics) {
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switch (diag.first) {
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default:
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error_stream.PutCString(diag.second);
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error_stream.PutChar('\n');
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break;
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case clang::DiagnosticsEngine::Level::Ignored:
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break;
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}
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}
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}
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static FileSpec GetResourceDir() {
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static FileSpec g_cached_resource_dir;
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static llvm::once_flag g_once_flag;
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llvm::call_once(g_once_flag, []() {
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HostInfo::GetLLDBPath(lldb::ePathTypeClangDir, g_cached_resource_dir);
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});
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return g_cached_resource_dir;
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}
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ClangModulesDeclVendor::ClangModulesDeclVendor() {}
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ClangModulesDeclVendor::~ClangModulesDeclVendor() {}
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ClangModulesDeclVendorImpl::ClangModulesDeclVendorImpl(
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llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine> diagnostics_engine,
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std::shared_ptr<clang::CompilerInvocation> compiler_invocation,
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std::unique_ptr<clang::CompilerInstance> compiler_instance,
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std::unique_ptr<clang::Parser> parser)
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: m_diagnostics_engine(std::move(diagnostics_engine)),
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m_compiler_invocation(std::move(compiler_invocation)),
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m_compiler_instance(std::move(compiler_instance)),
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m_parser(std::move(parser)) {}
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void ClangModulesDeclVendorImpl::ReportModuleExportsHelper(
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std::set<ClangModulesDeclVendor::ModuleID> &exports,
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clang::Module *module) {
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if (exports.count(reinterpret_cast<ClangModulesDeclVendor::ModuleID>(module)))
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return;
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exports.insert(reinterpret_cast<ClangModulesDeclVendor::ModuleID>(module));
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llvm::SmallVector<clang::Module *, 2> sub_exports;
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module->getExportedModules(sub_exports);
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for (clang::Module *module : sub_exports) {
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ReportModuleExportsHelper(exports, module);
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}
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}
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void ClangModulesDeclVendorImpl::ReportModuleExports(
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ClangModulesDeclVendor::ModuleVector &exports, clang::Module *module) {
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std::set<ClangModulesDeclVendor::ModuleID> exports_set;
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ReportModuleExportsHelper(exports_set, module);
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for (ModuleID module : exports_set) {
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exports.push_back(module);
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}
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}
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bool ClangModulesDeclVendorImpl::AddModule(ModulePath &path,
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ModuleVector *exported_modules,
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Stream &error_stream) {
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// Fail early.
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if (m_compiler_instance->hadModuleLoaderFatalFailure()) {
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error_stream.PutCString("error: Couldn't load a module because the module "
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"loader is in a fatal state.\n");
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return false;
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}
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// Check if we've already imported this module.
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std::vector<ConstString> imported_module;
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for (ConstString path_component : path) {
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imported_module.push_back(path_component);
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}
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{
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ImportedModuleMap::iterator mi = m_imported_modules.find(imported_module);
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if (mi != m_imported_modules.end()) {
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if (exported_modules) {
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ReportModuleExports(*exported_modules, mi->second);
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}
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return true;
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}
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}
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if (!m_compiler_instance->getPreprocessor()
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.getHeaderSearchInfo()
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.lookupModule(path[0].GetStringRef())) {
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error_stream.Printf("error: Header search couldn't locate module %s\n",
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path[0].AsCString());
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return false;
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}
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llvm::SmallVector<std::pair<clang::IdentifierInfo *, clang::SourceLocation>,
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4>
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clang_path;
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{
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clang::SourceManager &source_manager =
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m_compiler_instance->getASTContext().getSourceManager();
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for (ConstString path_component : path) {
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clang_path.push_back(std::make_pair(
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&m_compiler_instance->getASTContext().Idents.get(
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path_component.GetStringRef()),
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source_manager.getLocForStartOfFile(source_manager.getMainFileID())
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.getLocWithOffset(m_source_location_index++)));
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}
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}
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StoringDiagnosticConsumer *diagnostic_consumer =
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static_cast<StoringDiagnosticConsumer *>(
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m_compiler_instance->getDiagnostics().getClient());
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diagnostic_consumer->ClearDiagnostics();
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clang::Module *top_level_module = DoGetModule(clang_path.front(), false);
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if (!top_level_module) {
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diagnostic_consumer->DumpDiagnostics(error_stream);
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error_stream.Printf("error: Couldn't load top-level module %s\n",
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path[0].AsCString());
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return false;
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}
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clang::Module *submodule = top_level_module;
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for (size_t ci = 1; ci < path.size(); ++ci) {
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llvm::StringRef component = path[ci].GetStringRef();
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submodule = submodule->findSubmodule(component.str());
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if (!submodule) {
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diagnostic_consumer->DumpDiagnostics(error_stream);
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error_stream.Printf("error: Couldn't load submodule %s\n",
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component.str().c_str());
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return false;
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}
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}
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clang::Module *requested_module = DoGetModule(clang_path, true);
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if (requested_module != nullptr) {
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if (exported_modules) {
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ReportModuleExports(*exported_modules, requested_module);
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}
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m_imported_modules[imported_module] = requested_module;
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m_enabled = true;
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return true;
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}
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return false;
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}
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bool ClangModulesDeclVendor::LanguageSupportsClangModules(
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lldb::LanguageType language) {
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switch (language) {
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default:
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return false;
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// C++ and friends to be added
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case lldb::LanguageType::eLanguageTypeC:
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case lldb::LanguageType::eLanguageTypeC11:
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case lldb::LanguageType::eLanguageTypeC89:
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case lldb::LanguageType::eLanguageTypeC99:
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case lldb::LanguageType::eLanguageTypeObjC:
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return true;
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}
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}
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bool ClangModulesDeclVendorImpl::AddModulesForCompileUnit(
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CompileUnit &cu, ClangModulesDeclVendor::ModuleVector &exported_modules,
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Stream &error_stream) {
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if (LanguageSupportsClangModules(cu.GetLanguage())) {
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std::vector<ConstString> imported_modules = cu.GetImportedModules();
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for (ConstString imported_module : imported_modules) {
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std::vector<ConstString> path;
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path.push_back(imported_module);
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if (!AddModule(path, &exported_modules, error_stream)) {
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return false;
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}
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}
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return true;
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}
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return true;
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}
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// ClangImporter::lookupValue
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uint32_t
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ClangModulesDeclVendorImpl::FindDecls(const ConstString &name, bool append,
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uint32_t max_matches,
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std::vector<clang::NamedDecl *> &decls) {
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if (!m_enabled) {
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return 0;
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}
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if (!append)
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decls.clear();
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clang::IdentifierInfo &ident =
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m_compiler_instance->getASTContext().Idents.get(name.GetStringRef());
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clang::LookupResult lookup_result(
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m_compiler_instance->getSema(), clang::DeclarationName(&ident),
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clang::SourceLocation(), clang::Sema::LookupOrdinaryName);
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m_compiler_instance->getSema().LookupName(
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lookup_result,
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m_compiler_instance->getSema().getScopeForContext(
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m_compiler_instance->getASTContext().getTranslationUnitDecl()));
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uint32_t num_matches = 0;
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for (clang::NamedDecl *named_decl : lookup_result) {
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if (num_matches >= max_matches)
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return num_matches;
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decls.push_back(named_decl);
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++num_matches;
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}
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return num_matches;
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}
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void ClangModulesDeclVendorImpl::ForEachMacro(
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const ClangModulesDeclVendor::ModuleVector &modules,
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std::function<bool(const std::string &)> handler) {
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if (!m_enabled) {
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return;
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}
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typedef std::map<ModuleID, ssize_t> ModulePriorityMap;
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ModulePriorityMap module_priorities;
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ssize_t priority = 0;
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for (ModuleID module : modules) {
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module_priorities[module] = priority++;
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}
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if (m_compiler_instance->getPreprocessor().getExternalSource()) {
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m_compiler_instance->getPreprocessor()
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.getExternalSource()
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->ReadDefinedMacros();
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}
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for (clang::Preprocessor::macro_iterator
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mi = m_compiler_instance->getPreprocessor().macro_begin(),
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me = m_compiler_instance->getPreprocessor().macro_end();
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mi != me; ++mi) {
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const clang::IdentifierInfo *ii = nullptr;
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{
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if (clang::IdentifierInfoLookup *lookup =
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m_compiler_instance->getPreprocessor()
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.getIdentifierTable()
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.getExternalIdentifierLookup()) {
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lookup->get(mi->first->getName());
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}
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if (!ii) {
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ii = mi->first;
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}
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}
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ssize_t found_priority = -1;
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clang::MacroInfo *macro_info = nullptr;
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for (clang::ModuleMacro *module_macro :
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m_compiler_instance->getPreprocessor().getLeafModuleMacros(ii)) {
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clang::Module *module = module_macro->getOwningModule();
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{
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ModulePriorityMap::iterator pi =
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module_priorities.find(reinterpret_cast<ModuleID>(module));
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if (pi != module_priorities.end() && pi->second > found_priority) {
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macro_info = module_macro->getMacroInfo();
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found_priority = pi->second;
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}
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}
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clang::Module *top_level_module = module->getTopLevelModule();
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if (top_level_module != module) {
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ModulePriorityMap::iterator pi = module_priorities.find(
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reinterpret_cast<ModuleID>(top_level_module));
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if ((pi != module_priorities.end()) && pi->second > found_priority) {
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macro_info = module_macro->getMacroInfo();
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found_priority = pi->second;
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}
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}
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}
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if (macro_info) {
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std::string macro_expansion = "#define ";
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macro_expansion.append(mi->first->getName().str());
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{
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if (macro_info->isFunctionLike()) {
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macro_expansion.append("(");
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bool first_arg = true;
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for (auto pi = macro_info->param_begin(),
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pe = macro_info->param_end();
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pi != pe; ++pi) {
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if (!first_arg) {
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macro_expansion.append(", ");
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} else {
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first_arg = false;
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}
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macro_expansion.append((*pi)->getName().str());
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}
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if (macro_info->isC99Varargs()) {
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if (first_arg) {
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macro_expansion.append("...");
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} else {
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macro_expansion.append(", ...");
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}
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} else if (macro_info->isGNUVarargs()) {
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macro_expansion.append("...");
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}
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macro_expansion.append(")");
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}
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macro_expansion.append(" ");
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bool first_token = true;
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for (clang::MacroInfo::tokens_iterator ti = macro_info->tokens_begin(),
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te = macro_info->tokens_end();
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ti != te; ++ti) {
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if (!first_token) {
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macro_expansion.append(" ");
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} else {
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first_token = false;
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}
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if (ti->isLiteral()) {
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if (const char *literal_data = ti->getLiteralData()) {
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std::string token_str(literal_data, ti->getLength());
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macro_expansion.append(token_str);
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} else {
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bool invalid = false;
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const char *literal_source =
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m_compiler_instance->getSourceManager().getCharacterData(
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ti->getLocation(), &invalid);
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if (invalid) {
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lldbassert(0 && "Unhandled token kind");
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macro_expansion.append("<unknown literal value>");
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} else {
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macro_expansion.append(
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std::string(literal_source, ti->getLength()));
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}
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}
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} else if (const char *punctuator_spelling =
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clang::tok::getPunctuatorSpelling(ti->getKind())) {
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macro_expansion.append(punctuator_spelling);
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} else if (const char *keyword_spelling =
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clang::tok::getKeywordSpelling(ti->getKind())) {
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macro_expansion.append(keyword_spelling);
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} else {
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switch (ti->getKind()) {
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case clang::tok::TokenKind::identifier:
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macro_expansion.append(ti->getIdentifierInfo()->getName().str());
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break;
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case clang::tok::TokenKind::raw_identifier:
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macro_expansion.append(ti->getRawIdentifier().str());
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break;
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default:
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||
macro_expansion.append(ti->getName());
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (handler(macro_expansion)) {
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
clang::ModuleLoadResult
|
||
ClangModulesDeclVendorImpl::DoGetModule(clang::ModuleIdPath path,
|
||
bool make_visible) {
|
||
clang::Module::NameVisibilityKind visibility =
|
||
make_visible ? clang::Module::AllVisible : clang::Module::Hidden;
|
||
|
||
const bool is_inclusion_directive = false;
|
||
|
||
return m_compiler_instance->loadModule(path.front().second, path, visibility,
|
||
is_inclusion_directive);
|
||
}
|
||
|
||
clang::ExternalASTMerger::ImporterSource
|
||
ClangModulesDeclVendorImpl::GetImporterSource() {
|
||
return {m_compiler_instance->getASTContext(),
|
||
m_compiler_instance->getFileManager(), m_origin_map};
|
||
}
|
||
|
||
static const char *ModuleImportBufferName = "LLDBModulesMemoryBuffer";
|
||
|
||
lldb_private::ClangModulesDeclVendor *
|
||
ClangModulesDeclVendor::Create(Target &target) {
|
||
// FIXME we should insure programmatically that the expression parser's
|
||
// compiler and the modules runtime's
|
||
// compiler are both initialized in the same way – preferably by the same
|
||
// code.
|
||
|
||
if (!target.GetPlatform()->SupportsModules())
|
||
return nullptr;
|
||
|
||
const ArchSpec &arch = target.GetArchitecture();
|
||
|
||
std::vector<std::string> compiler_invocation_arguments = {
|
||
"clang",
|
||
"-fmodules",
|
||
"-fimplicit-module-maps",
|
||
"-fcxx-modules",
|
||
"-fsyntax-only",
|
||
"-femit-all-decls",
|
||
"-target",
|
||
arch.GetTriple().str(),
|
||
"-fmodules-validate-system-headers",
|
||
"-Werror=non-modular-include-in-framework-module"};
|
||
|
||
target.GetPlatform()->AddClangModuleCompilationOptions(
|
||
&target, compiler_invocation_arguments);
|
||
|
||
compiler_invocation_arguments.push_back(ModuleImportBufferName);
|
||
|
||
// Add additional search paths with { "-I", path } or { "-F", path } here.
|
||
|
||
{
|
||
llvm::SmallString<128> DefaultModuleCache;
|
||
const bool erased_on_reboot = false;
|
||
llvm::sys::path::system_temp_directory(erased_on_reboot,
|
||
DefaultModuleCache);
|
||
llvm::sys::path::append(DefaultModuleCache, "org.llvm.clang");
|
||
llvm::sys::path::append(DefaultModuleCache, "ModuleCache");
|
||
std::string module_cache_argument("-fmodules-cache-path=");
|
||
module_cache_argument.append(DefaultModuleCache.str().str());
|
||
compiler_invocation_arguments.push_back(module_cache_argument);
|
||
}
|
||
|
||
FileSpecList &module_search_paths = target.GetClangModuleSearchPaths();
|
||
|
||
for (size_t spi = 0, spe = module_search_paths.GetSize(); spi < spe; ++spi) {
|
||
const FileSpec &search_path = module_search_paths.GetFileSpecAtIndex(spi);
|
||
|
||
std::string search_path_argument = "-I";
|
||
search_path_argument.append(search_path.GetPath());
|
||
|
||
compiler_invocation_arguments.push_back(search_path_argument);
|
||
}
|
||
|
||
{
|
||
FileSpec clang_resource_dir = GetResourceDir();
|
||
|
||
if (llvm::sys::fs::is_directory(clang_resource_dir.GetPath())) {
|
||
compiler_invocation_arguments.push_back("-resource-dir");
|
||
compiler_invocation_arguments.push_back(clang_resource_dir.GetPath());
|
||
}
|
||
}
|
||
|
||
llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine> diagnostics_engine =
|
||
clang::CompilerInstance::createDiagnostics(new clang::DiagnosticOptions,
|
||
new StoringDiagnosticConsumer);
|
||
|
||
std::vector<const char *> compiler_invocation_argument_cstrs;
|
||
|
||
for (const std::string &arg : compiler_invocation_arguments) {
|
||
compiler_invocation_argument_cstrs.push_back(arg.c_str());
|
||
}
|
||
|
||
std::shared_ptr<clang::CompilerInvocation> invocation =
|
||
clang::createInvocationFromCommandLine(compiler_invocation_argument_cstrs,
|
||
diagnostics_engine);
|
||
|
||
if (!invocation)
|
||
return nullptr;
|
||
|
||
std::unique_ptr<llvm::MemoryBuffer> source_buffer =
|
||
llvm::MemoryBuffer::getMemBuffer(
|
||
"extern int __lldb __attribute__((unavailable));",
|
||
ModuleImportBufferName);
|
||
|
||
invocation->getPreprocessorOpts().addRemappedFile(ModuleImportBufferName,
|
||
source_buffer.release());
|
||
|
||
std::unique_ptr<clang::CompilerInstance> instance(
|
||
new clang::CompilerInstance);
|
||
|
||
instance->setDiagnostics(diagnostics_engine.get());
|
||
instance->setInvocation(invocation);
|
||
|
||
std::unique_ptr<clang::FrontendAction> action(new clang::SyntaxOnlyAction);
|
||
|
||
instance->setTarget(clang::TargetInfo::CreateTargetInfo(
|
||
*diagnostics_engine, instance->getInvocation().TargetOpts));
|
||
|
||
if (!instance->hasTarget())
|
||
return nullptr;
|
||
|
||
instance->getTarget().adjust(instance->getLangOpts());
|
||
|
||
if (!action->BeginSourceFile(*instance,
|
||
instance->getFrontendOpts().Inputs[0]))
|
||
return nullptr;
|
||
|
||
instance->getPreprocessor().enableIncrementalProcessing();
|
||
|
||
instance->createModuleManager();
|
||
|
||
instance->createSema(action->getTranslationUnitKind(), nullptr);
|
||
|
||
const bool skipFunctionBodies = false;
|
||
std::unique_ptr<clang::Parser> parser(new clang::Parser(
|
||
instance->getPreprocessor(), instance->getSema(), skipFunctionBodies));
|
||
|
||
instance->getPreprocessor().EnterMainSourceFile();
|
||
parser->Initialize();
|
||
|
||
clang::Parser::DeclGroupPtrTy parsed;
|
||
|
||
while (!parser->ParseTopLevelDecl(parsed))
|
||
;
|
||
|
||
return new ClangModulesDeclVendorImpl(std::move(diagnostics_engine),
|
||
std::move(invocation),
|
||
std::move(instance), std::move(parser));
|
||
}
|