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//===- JSONBackend.cpp - Generate a JSON dump of all records. -*- 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
//
//===----------------------------------------------------------------------===//
//
// This TableGen back end generates a machine-readable representation
// of all the classes and records defined by the input, in JSON format.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/BitVector.h"
#include "llvm/Support/Debug.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include "llvm/Support/JSON.h"
#define DEBUG_TYPE "json-emitter"
using namespace llvm;
namespace {
class JSONEmitter {
private:
RecordKeeper &Records;
json::Value translateInit(const Init &I);
json::Array listSuperclasses(const Record &R);
public:
JSONEmitter(RecordKeeper &R);
void run(raw_ostream &OS);
};
} // end anonymous namespace
JSONEmitter::JSONEmitter(RecordKeeper &R) : Records(R) {}
json::Value JSONEmitter::translateInit(const Init &I) {
// Init subclasses that we return as JSON primitive values of one
// kind or another.
if (isa<UnsetInit>(&I)) {
return nullptr;
} else if (auto *Bit = dyn_cast<BitInit>(&I)) {
return Bit->getValue() ? 1 : 0;
} else if (auto *Bits = dyn_cast<BitsInit>(&I)) {
json::Array array;
for (unsigned i = 0, limit = Bits->getNumBits(); i < limit; i++)
array.push_back(translateInit(*Bits->getBit(i)));
return std::move(array);
} else if (auto *Int = dyn_cast<IntInit>(&I)) {
return Int->getValue();
} else if (auto *Str = dyn_cast<StringInit>(&I)) {
return Str->getValue();
} else if (auto *Code = dyn_cast<CodeInit>(&I)) {
return Code->getValue();
} else if (auto *List = dyn_cast<ListInit>(&I)) {
json::Array array;
for (auto val : *List)
array.push_back(translateInit(*val));
return std::move(array);
}
// Init subclasses that we return as JSON objects containing a
// 'kind' discriminator. For these, we also provide the same
// translation back into TableGen input syntax that -print-records
// would give.
json::Object obj;
obj["printable"] = I.getAsString();
if (auto *Def = dyn_cast<DefInit>(&I)) {
obj["kind"] = "def";
obj["def"] = Def->getDef()->getName();
return std::move(obj);
} else if (auto *Var = dyn_cast<VarInit>(&I)) {
obj["kind"] = "var";
obj["var"] = Var->getName();
return std::move(obj);
} else if (auto *VarBit = dyn_cast<VarBitInit>(&I)) {
if (auto *Var = dyn_cast<VarInit>(VarBit->getBitVar())) {
obj["kind"] = "varbit";
obj["var"] = Var->getName();
obj["index"] = VarBit->getBitNum();
return std::move(obj);
}
} else if (auto *Dag = dyn_cast<DagInit>(&I)) {
obj["kind"] = "dag";
obj["operator"] = translateInit(*Dag->getOperator());
if (auto name = Dag->getName())
obj["name"] = name->getAsUnquotedString();
json::Array args;
for (unsigned i = 0, limit = Dag->getNumArgs(); i < limit; ++i) {
json::Array arg;
arg.push_back(translateInit(*Dag->getArg(i)));
if (auto argname = Dag->getArgName(i))
arg.push_back(argname->getAsUnquotedString());
else
arg.push_back(nullptr);
args.push_back(std::move(arg));
}
obj["args"] = std::move(args);
return std::move(obj);
}
// Final fallback: anything that gets past here is simply given a
// kind field of 'complex', and the only other field is the standard
// 'printable' representation.
assert(!I.isConcrete());
obj["kind"] = "complex";
return std::move(obj);
}
void JSONEmitter::run(raw_ostream &OS) {
json::Object root;
root["!tablegen_json_version"] = 1;
// Prepare the arrays that will list the instances of every class.
// We mostly fill those in by iterating over the superclasses of
// each def, but we also want to ensure we store an empty list for a
// class with no instances at all, so we do a preliminary iteration
// over the classes, invoking std::map::operator[] to default-
// construct the array for each one.
std::map<std::string, json::Array> instance_lists;
for (const auto &C : Records.getClasses()) {
auto &Name = C.second->getNameInitAsString();
(void)instance_lists[Name];
}
// Main iteration over the defs.
for (const auto &D : Records.getDefs()) {
auto &Name = D.second->getNameInitAsString();
auto &Def = *D.second;
json::Object obj;
json::Array fields;
for (const RecordVal &RV : Def.getValues()) {
if (!Def.isTemplateArg(RV.getNameInit())) {
auto Name = RV.getNameInitAsString();
if (RV.getPrefix())
fields.push_back(Name);
obj[Name] = translateInit(*RV.getValue());
}
}
obj["!fields"] = std::move(fields);
json::Array superclasses;
for (const auto &SuperPair : Def.getSuperClasses())
superclasses.push_back(SuperPair.first->getNameInitAsString());
obj["!superclasses"] = std::move(superclasses);
obj["!name"] = Name;
obj["!anonymous"] = Def.isAnonymous();
root[Name] = std::move(obj);
// Add this def to the instance list for each of its superclasses.
for (const auto &SuperPair : Def.getSuperClasses()) {
auto SuperName = SuperPair.first->getNameInitAsString();
instance_lists[SuperName].push_back(Name);
}
}
// Make a JSON object from the std::map of instance lists.
json::Object instanceof;
for (auto kv: instance_lists)
instanceof[kv.first] = std::move(kv.second);
root["!instanceof"] = std::move(instanceof);
// Done. Write the output.
OS << json::Value(std::move(root)) << "\n";
}
namespace llvm {
void EmitJSON(RecordKeeper &RK, raw_ostream &OS) { JSONEmitter(RK).run(OS); }
} // end namespace llvm
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