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142 lines
4.1 KiB
C++
142 lines
4.1 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 "ClangASTNodesEmitter.h"
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#include "Record.h"
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#include <map>
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#include <cctype>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Statement Node Tables (.inc file) generation.
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//===----------------------------------------------------------------------===//
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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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// 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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// Returns the first and last non-abstract subrecords
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// Called recursively to ensure that nodes remain contiguous
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static std::pair<Record *, Record *> EmitStmtNode(const ChildMap &Tree,
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raw_ostream &OS,
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Record *Base,
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bool Root = true) {
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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_STMT(" << NodeName << "(" << R->getName() << ", "
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<< Base->getName() << "))\n";
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else
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OS << NodeName << "(" << R->getName() << ", "
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<< Base->getName() << ")\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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= EmitStmtNode(Tree, OS, R, false);
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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 (Root)
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OS << "LAST_STMT_RANGE(";
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else
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OS << "STMT_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 ClangStmtNodesEmitter::run(raw_ostream &OS) {
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// Write the preamble
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OS << "#ifndef ABSTRACT_STMT\n";
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OS << "# define ABSTRACT_STMT(Stmt) Stmt\n";
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OS << "#endif\n";
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OS << "#ifndef STMT_RANGE\n";
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OS << "# define STMT_RANGE(Base, First, Last)\n";
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OS << "#endif\n\n";
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OS << "#ifndef LAST_STMT_RANGE\n";
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OS << "# define LAST_STMT_RANGE(Base, First, Last) "
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"STMT_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 = Records.getAllDerivedDefinitions("Stmt");
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ChildMap Tree;
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// Create a pseudo-record to serve as the Stmt node, which isn't actually
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// output.
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Record Stmt ("Stmt", SMLoc());
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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(&Stmt, R));
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}
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EmitStmtNode(Tree, OS, &Stmt);
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OS << "#undef STMT\n";
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OS << "#undef STMT_RANGE\n";
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OS << "#undef LAST_STMT_RANGE\n";
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OS << "#undef ABSTRACT_STMT\n";
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}
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