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