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| //===- PrintFunctionNames.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Example clang plugin which simply prints the names of all the top-level decls
// in the input file.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/FrontendPluginRegistry.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Sema/Sema.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
namespace {
class PrintFunctionsConsumer : public ASTConsumer {
CompilerInstance &Instance;
std::set<std::string> ParsedTemplates;
public:
PrintFunctionsConsumer(CompilerInstance &Instance,
std::set<std::string> ParsedTemplates)
: Instance(Instance), ParsedTemplates(ParsedTemplates) {}
bool HandleTopLevelDecl(DeclGroupRef DG) override {
for (DeclGroupRef::iterator i = DG.begin(), e = DG.end(); i != e; ++i) {
const Decl *D = *i;
if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
llvm::errs() << "top-level-decl: \"" << ND->getNameAsString() << "\"\n";
}
return true;
}
void HandleTranslationUnit(ASTContext& context) override {
if (!Instance.getLangOpts().DelayedTemplateParsing)
return;
// This demonstrates how to force instantiation of some templates in
// -fdelayed-template-parsing mode. (Note: Doing this unconditionally for
// all templates is similar to not using -fdelayed-template-parsig in the
// first place.)
// The advantage of doing this in HandleTranslationUnit() is that all
// codegen (when using -add-plugin) is completely finished and this can't
// affect the compiler output.
struct Visitor : public RecursiveASTVisitor<Visitor> {
const std::set<std::string> &ParsedTemplates;
Visitor(const std::set<std::string> &ParsedTemplates)
: ParsedTemplates(ParsedTemplates) {}
bool VisitFunctionDecl(FunctionDecl *FD) {
if (FD->isLateTemplateParsed() &&
ParsedTemplates.count(FD->getNameAsString()))
LateParsedDecls.insert(FD);
return true;
}
std::set<FunctionDecl*> LateParsedDecls;
} v(ParsedTemplates);
v.TraverseDecl(context.getTranslationUnitDecl());
clang::Sema &sema = Instance.getSema();
for (const FunctionDecl *FD : v.LateParsedDecls) {
clang::LateParsedTemplate &LPT =
*sema.LateParsedTemplateMap.find(FD)->second;
sema.LateTemplateParser(sema.OpaqueParser, LPT);
llvm::errs() << "late-parsed-decl: \"" << FD->getNameAsString() << "\"\n";
}
}
};
class PrintFunctionNamesAction : public PluginASTAction {
std::set<std::string> ParsedTemplates;
protected:
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
llvm::StringRef) override {
return std::make_unique<PrintFunctionsConsumer>(CI, ParsedTemplates);
}
bool ParseArgs(const CompilerInstance &CI,
const std::vector<std::string> &args) override {
for (unsigned i = 0, e = args.size(); i != e; ++i) {
llvm::errs() << "PrintFunctionNames arg = " << args[i] << "\n";
// Example error handling.
DiagnosticsEngine &D = CI.getDiagnostics();
if (args[i] == "-an-error") {
unsigned DiagID = D.getCustomDiagID(DiagnosticsEngine::Error,
"invalid argument '%0'");
D.Report(DiagID) << args[i];
return false;
} else if (args[i] == "-parse-template") {
if (i + 1 >= e) {
D.Report(D.getCustomDiagID(DiagnosticsEngine::Error,
"missing -parse-template argument"));
return false;
}
++i;
ParsedTemplates.insert(args[i]);
}
}
if (!args.empty() && args[0] == "help")
PrintHelp(llvm::errs());
return true;
}
void PrintHelp(llvm::raw_ostream& ros) {
ros << "Help for PrintFunctionNames plugin goes here\n";
}
};
}
static FrontendPluginRegistry::Add<PrintFunctionNamesAction>
X("print-fns", "print function names");
|