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//===--- Compiler.h ----------------------------------------------*- C++-*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Shared utilities for invoking the clang compiler.
// Most callers will use this through Preamble/ParsedAST, but some features like
// CodeComplete run their own compile actions that share these low-level pieces.
#include "FeatureModule.h"
#include "GlobalCompilationDatabase.h"
#include "TidyProvider.h"
#include "index/Index.h"
#include "support/ThreadsafeFS.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/PrecompiledPreamble.h"
#include "clang/Tooling/CompilationDatabase.h"
#include <memory>
#include <vector>
namespace clang {
namespace clangd {
class IgnoreDiagnostics : public DiagnosticConsumer {
static void log(DiagnosticsEngine::Level DiagLevel,
const clang::Diagnostic &Info);
void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
const clang::Diagnostic &Info) override;
// Options to run clang e.g. when parsing AST.
struct ParseOptions {
// (empty at present, formerly controlled recovery AST, include-fixer etc)
/// Information required to run clang, e.g. to parse AST or do code completion.
struct ParseInputs {
tooling::CompileCommand CompileCommand;
const ThreadsafeFS *TFS;
std::string Contents;
// Version identifier for Contents, provided by the client and opaque to us.
std::string Version = "null";
// Prevent reuse of the cached preamble/AST. Slow! Useful to workaround
// clangd's assumption that missing header files will stay missing.
bool ForceRebuild = false;
// Used to recover from diagnostics (e.g. find missing includes for symbol).
const SymbolIndex *Index = nullptr;
ParseOptions Opts = ParseOptions();
TidyProviderRef ClangTidyProvider = {};
// Used to acquire ASTListeners when parsing files.
FeatureModuleSet *FeatureModules = nullptr;
/// Clears \p CI from options that are not supported by clangd, like codegen or
/// plugins. This should be combined with CommandMangler::adjust, which provides
/// similar functionality for options that needs to be stripped from compile
/// flags.
void disableUnsupportedOptions(CompilerInvocation &CI);
/// Builds compiler invocation that could be used to build AST or preamble.
buildCompilerInvocation(const ParseInputs &Inputs, clang::DiagnosticConsumer &D,
std::vector<std::string> *CC1Args = nullptr);
/// Creates a compiler instance, configured so that:
/// - Contents of the parsed file are remapped to \p MainFile.
/// - Preamble is overriden to use PCH passed to this function. It means the
/// changes to the preamble headers or files included in the preamble are
/// not visible to this compiler instance.
/// - llvm::vfs::FileSystem is used for all underlying file accesses. The
/// actual vfs used by the compiler may be an overlay over the passed vfs.
/// Returns null on errors. When non-null value is returned, it is expected to
/// be consumed by FrontendAction::BeginSourceFile to properly destroy \p
/// MainFile.
std::unique_ptr<CompilerInstance> prepareCompilerInstance(
std::unique_ptr<clang::CompilerInvocation>, const PrecompiledPreamble *,
std::unique_ptr<llvm::MemoryBuffer> MainFile,
IntrusiveRefCntPtr<llvm::vfs::FileSystem>, DiagnosticConsumer &);
/// Respect `#pragma clang __debug crash` etc, which are usually disabled.
/// This may only be called before threads are spawned.
void allowCrashPragmasForTest();
} // namespace clangd
} // namespace clang