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//=== ClangASTNodesEmitter.cpp - Generate Clang AST node tables -*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// These tablegen backends emit Clang AST node tables
//
//===----------------------------------------------------------------------===//
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <cctype>
#include <map>
#include <set>
#include <string>
using namespace llvm;
/// ClangASTNodesEmitter - The top-level class emits .inc files containing
/// declarations of Clang statements.
///
namespace {
class ClangASTNodesEmitter {
// A map from a node to each of its derived nodes.
typedef std::multimap<Record*, Record*> ChildMap;
typedef ChildMap::const_iterator ChildIterator;
RecordKeeper &Records;
Record Root;
const std::string &BaseSuffix;
// Create a macro-ized version of a name
static std::string macroName(std::string S) {
for (unsigned i = 0; i < S.size(); ++i)
S[i] = std::toupper(S[i]);
return S;
}
// Return the name to be printed in the base field. Normally this is
// the record's name plus the base suffix, but if it is the root node and
// the suffix is non-empty, it's just the suffix.
std::string baseName(Record &R) {
if (&R == &Root && !BaseSuffix.empty())
return BaseSuffix;
return R.getName().str() + BaseSuffix;
}
std::pair<Record *, Record *> EmitNode (const ChildMap &Tree, raw_ostream& OS,
Record *Base);
public:
explicit ClangASTNodesEmitter(RecordKeeper &R, const std::string &N,
const std::string &S)
: Records(R), Root(N, SMLoc(), R), BaseSuffix(S)
{}
// run - Output the .inc file contents
void run(raw_ostream &OS);
};
} // end anonymous namespace
//===----------------------------------------------------------------------===//
// Statement Node Tables (.inc file) generation.
//===----------------------------------------------------------------------===//
// Returns the first and last non-abstract subrecords
// Called recursively to ensure that nodes remain contiguous
std::pair<Record *, Record *> ClangASTNodesEmitter::EmitNode(
const ChildMap &Tree,
raw_ostream &OS,
Record *Base) {
std::string BaseName = macroName(Base->getName());
ChildIterator i = Tree.lower_bound(Base), e = Tree.upper_bound(Base);
Record *First = nullptr, *Last = nullptr;
// This might be the pseudo-node for Stmt; don't assume it has an Abstract
// bit
if (Base->getValue("Abstract") && !Base->getValueAsBit("Abstract"))
First = Last = Base;
for (; i != e; ++i) {
Record *R = i->second;
bool Abstract = R->getValueAsBit("Abstract");
std::string NodeName = macroName(R->getName());
OS << "#ifndef " << NodeName << "\n";
OS << "# define " << NodeName << "(Type, Base) "
<< BaseName << "(Type, Base)\n";
OS << "#endif\n";
if (Abstract)
OS << "ABSTRACT_" << macroName(Root.getName()) << "(" << NodeName << "("
<< R->getName() << ", " << baseName(*Base) << "))\n";
else
OS << NodeName << "(" << R->getName() << ", "
<< baseName(*Base) << ")\n";
if (Tree.find(R) != Tree.end()) {
const std::pair<Record *, Record *> &Result
= EmitNode(Tree, OS, R);
if (!First && Result.first)
First = Result.first;
if (Result.second)
Last = Result.second;
} else {
if (!Abstract) {
Last = R;
if (!First)
First = R;
}
}
OS << "#undef " << NodeName << "\n\n";
}
if (First) {
assert (Last && "Got a first node but not a last node for a range!");
if (Base == &Root)
OS << "LAST_" << macroName(Root.getName()) << "_RANGE(";
else
OS << macroName(Root.getName()) << "_RANGE(";
OS << Base->getName() << ", " << First->getName() << ", "
<< Last->getName() << ")\n\n";
}
return std::make_pair(First, Last);
}
void ClangASTNodesEmitter::run(raw_ostream &OS) {
emitSourceFileHeader("List of AST nodes of a particular kind", OS);
// Write the preamble
OS << "#ifndef ABSTRACT_" << macroName(Root.getName()) << "\n";
OS << "# define ABSTRACT_" << macroName(Root.getName()) << "(Type) Type\n";
OS << "#endif\n";
OS << "#ifndef " << macroName(Root.getName()) << "_RANGE\n";
OS << "# define "
<< macroName(Root.getName()) << "_RANGE(Base, First, Last)\n";
OS << "#endif\n\n";
OS << "#ifndef LAST_" << macroName(Root.getName()) << "_RANGE\n";
OS << "# define LAST_"
<< macroName(Root.getName()) << "_RANGE(Base, First, Last) "
<< macroName(Root.getName()) << "_RANGE(Base, First, Last)\n";
OS << "#endif\n\n";
// Emit statements
const std::vector<Record*> Stmts
= Records.getAllDerivedDefinitions(Root.getName());
ChildMap Tree;
for (unsigned i = 0, e = Stmts.size(); i != e; ++i) {
Record *R = Stmts[i];
if (R->getValue("Base"))
Tree.insert(std::make_pair(R->getValueAsDef("Base"), R));
else
Tree.insert(std::make_pair(&Root, R));
}
EmitNode(Tree, OS, &Root);
OS << "#undef " << macroName(Root.getName()) << "\n";
OS << "#undef " << macroName(Root.getName()) << "_RANGE\n";
OS << "#undef LAST_" << macroName(Root.getName()) << "_RANGE\n";
OS << "#undef ABSTRACT_" << macroName(Root.getName()) << "\n";
}
namespace clang {
void EmitClangASTNodes(RecordKeeper &RK, raw_ostream &OS,
const std::string &N, const std::string &S) {
ClangASTNodesEmitter(RK, N, S).run(OS);
}
// Emits and addendum to a .inc file to enumerate the clang declaration
// contexts.
void EmitClangDeclContext(RecordKeeper &Records, raw_ostream &OS) {
// FIXME: Find a .td file format to allow for this to be represented better.
emitSourceFileHeader("List of AST Decl nodes", OS);
OS << "#ifndef DECL_CONTEXT\n";
OS << "# define DECL_CONTEXT(DECL)\n";
OS << "#endif\n";
OS << "#ifndef DECL_CONTEXT_BASE\n";
OS << "# define DECL_CONTEXT_BASE(DECL) DECL_CONTEXT(DECL)\n";
OS << "#endif\n";
typedef std::set<Record*> RecordSet;
typedef std::vector<Record*> RecordVector;
RecordVector DeclContextsVector
= Records.getAllDerivedDefinitions("DeclContext");
RecordVector Decls = Records.getAllDerivedDefinitions("Decl");
RecordSet DeclContexts (DeclContextsVector.begin(), DeclContextsVector.end());
for (RecordVector::iterator i = Decls.begin(), e = Decls.end(); i != e; ++i) {
Record *R = *i;
if (R->getValue("Base")) {
Record *B = R->getValueAsDef("Base");
if (DeclContexts.find(B) != DeclContexts.end()) {
OS << "DECL_CONTEXT_BASE(" << B->getName() << ")\n";
DeclContexts.erase(B);
}
}
}
// To keep identical order, RecordVector may be used
// instead of RecordSet.
for (RecordVector::iterator
i = DeclContextsVector.begin(), e = DeclContextsVector.end();
i != e; ++i)
if (DeclContexts.find(*i) != DeclContexts.end())
OS << "DECL_CONTEXT(" << (*i)->getName() << ")\n";
OS << "#undef DECL_CONTEXT\n";
OS << "#undef DECL_CONTEXT_BASE\n";
}
} // end namespace clang
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