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|
//
// upb - a minimalist implementation of protocol buffers.
//
// Copyright (c) 2011-2012 Google Inc. See LICENSE for details.
// Author: Josh Haberman <jhaberman@gmail.com>
//
// This set of handlers can write into a proto2::Message whose reflection class
// is _pi::Proto2Reflection (ie. proto1 messages; while slightly confusing, the
// name "Proto2Reflection" indicates that it is a reflection class implementing
// the proto2 reflection interface, but is used for proto1 generated messages).
//
// Like FieldAccessor this depends on breaking encapsulation, and will need to
// be changed if and when the details of _pi::Proto2Reflection change.
//
// Note that we have received an exception from c-style-artiters regarding
// dynamic_cast<> in this file:
// https://groups.google.com/a/google.com/d/msg/c-style/7Zp_XCX0e7s/I6dpzno4l-MJ
#include "upb/google/proto1.h"
#include <memory>
#include "net/proto2/public/repeated_field.h"
#include "net/proto/internal_layout.h"
#include "net/proto/proto2_reflection.h"
#include "upb/def.h"
#include "upb/handlers.h"
#include "upb/shim/shim.h"
#include "upb/sink.h"
template <class T> static T* GetPointer(void* message, size_t offset) {
return reinterpret_cast<T*>(static_cast<char*>(message) + offset);
}
namespace upb {
namespace google {
class P2R_Handlers {
public:
// Returns true if we were able to set an accessor and any other properties
// of the FieldDef that are necessary to read/write this field to a
// proto2::Message.
static bool TrySet(const proto2::FieldDescriptor* proto2_f,
const proto2::Message& m, const upb::FieldDef* upb_f,
upb::Handlers* h) {
const proto2::Reflection* base_r = m.GetReflection();
// See file comment re: dynamic_cast.
const _pi::Proto2Reflection* r =
dynamic_cast<const _pi::Proto2Reflection*>(base_r);
if (!r) return false;
// Extensions don't exist in proto1.
assert(!proto2_f->is_extension());
#define PRIMITIVE(name, type_name) \
case _pi::CREP_REQUIRED_##name: \
case _pi::CREP_OPTIONAL_##name: \
case _pi::CREP_REPEATED_##name: \
SetPrimitiveHandlers<type_name>(proto2_f, r, upb_f, h); \
return true;
switch (r->GetFieldLayout(proto2_f)->crep) {
PRIMITIVE(DOUBLE, double);
PRIMITIVE(FLOAT, float);
PRIMITIVE(INT64, int64_t);
PRIMITIVE(UINT64, uint64_t);
PRIMITIVE(INT32, int32_t);
PRIMITIVE(FIXED64, uint64_t);
PRIMITIVE(FIXED32, uint32_t);
PRIMITIVE(BOOL, bool);
case _pi::CREP_REQUIRED_STRING:
case _pi::CREP_OPTIONAL_STRING:
case _pi::CREP_REPEATED_STRING:
SetStringHandlers(proto2_f, r, upb_f, h);
return true;
case _pi::CREP_OPTIONAL_OUTOFLINE_STRING:
SetOutOfLineStringHandlers(proto2_f, r, upb_f, h);
return true;
case _pi::CREP_REQUIRED_CORD:
case _pi::CREP_OPTIONAL_CORD:
case _pi::CREP_REPEATED_CORD:
SetCordHandlers(proto2_f, r, upb_f, h);
return true;
case _pi::CREP_REQUIRED_GROUP:
case _pi::CREP_REQUIRED_FOREIGN:
case _pi::CREP_REQUIRED_FOREIGN_PROTO2:
SetRequiredMessageHandlers(proto2_f, m, r, upb_f, h);
return true;
case _pi::CREP_OPTIONAL_GROUP:
case _pi::CREP_REPEATED_GROUP:
case _pi::CREP_OPTIONAL_FOREIGN:
case _pi::CREP_REPEATED_FOREIGN:
case _pi::CREP_OPTIONAL_FOREIGN_PROTO2:
case _pi::CREP_REPEATED_FOREIGN_PROTO2:
SetMessageHandlers(proto2_f, m, r, upb_f, h);
return true;
case _pi::CREP_OPTIONAL_FOREIGN_WEAK:
case _pi::CREP_OPTIONAL_FOREIGN_WEAK_PROTO2:
SetWeakMessageHandlers(proto2_f, m, r, upb_f, h);
return true;
default:
assert(false);
return false;
}
}
#undef PRIMITIVE
// If the field "f" in the message "m" is a weak field, returns the prototype
// of the submessage (which may be a specific type or may be OpaqueMessage).
// Otherwise returns NULL.
static const proto2::Message* GetWeakPrototype(
const proto2::Message& m, const proto2::FieldDescriptor* f) {
// See file comment re: dynamic_cast.
const _pi::Proto2Reflection* r =
dynamic_cast<const _pi::Proto2Reflection*>(m.GetReflection());
if (!r) return NULL;
const _pi::Field* field = r->GetFieldLayout(f);
if (field->crep == _pi::CREP_OPTIONAL_FOREIGN_WEAK) {
return static_cast<const proto2::Message*>(
field->weak_layout()->default_instance);
} else if (field->crep == _pi::CREP_OPTIONAL_FOREIGN_WEAK_PROTO2) {
return field->proto2_weak_default_instance();
} else {
return NULL;
}
}
// If "m" is a message that uses Proto2Reflection, returns the prototype of
// the submessage (which may be OpaqueMessage for a weak field that is not
// linked in). Otherwise returns NULL.
static const proto2::Message* GetFieldPrototype(
const proto2::Message& m, const proto2::FieldDescriptor* f) {
// See file comment re: dynamic_cast.
const proto2::Message* ret = GetWeakPrototype(m, f);
if (ret) {
return ret;
} else if (dynamic_cast<const _pi::Proto2Reflection*>(m.GetReflection())) {
// Since proto1 has no dynamic message, it must be from the generated
// factory.
assert(f->cpp_type() == proto2::FieldDescriptor::CPPTYPE_MESSAGE);
ret = proto2::MessageFactory::generated_factory()->GetPrototype(
f->message_type());
assert(ret);
return ret;
} else {
return NULL;
}
}
private:
class FieldOffset {
public:
FieldOffset(const proto2::FieldDescriptor* f,
const _pi::Proto2Reflection* r)
: offset_(GetOffset(f, r)), is_repeated_(f->is_repeated()) {
if (!is_repeated_) {
int64_t hasbit = GetHasbit(f, r);
hasbyte_ = hasbit / 8;
mask_ = 1 << (hasbit % 8);
}
}
template <class T> T* GetFieldPointer(void* message) const {
return GetPointer<T>(message, offset_);
}
void SetHasbit(void* message) const {
assert(!is_repeated_);
uint8_t* byte = GetPointer<uint8_t>(message, hasbyte_);
*byte |= mask_;
}
private:
const size_t offset_;
bool is_repeated_;
// Only for non-repeated fields.
int32_t hasbyte_;
int8_t mask_;
};
static upb_selector_t GetSelector(const upb::FieldDef* f,
upb::Handlers::Type type) {
upb::Handlers::Selector selector;
bool ok = upb::Handlers::GetSelector(f, type, &selector);
UPB_ASSERT_VAR(ok, ok);
return selector;
}
static int16_t GetHasbit(const proto2::FieldDescriptor* f,
const _pi::Proto2Reflection* r) {
assert(!f->is_repeated());
return (r->layout_->has_bit_offset * 8) + r->GetFieldLayout(f)->has_index;
}
static uint16_t GetOffset(const proto2::FieldDescriptor* f,
const _pi::Proto2Reflection* r) {
return r->GetFieldLayout(f)->offset;
}
// StartSequence /////////////////////////////////////////////////////////////
static void SetStartSequenceHandler(
const proto2::FieldDescriptor* proto2_f, const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
assert(f->IsSequence());
h->SetStartSequenceHandler(
f, UpbBind(PushOffset, new FieldOffset(proto2_f, r)));
}
static void* PushOffset(void* m, const FieldOffset* offset) {
return offset->GetFieldPointer<void>(m);
}
// Primitive Value (numeric, enum, bool) /////////////////////////////////////
template <typename T>
static void SetPrimitiveHandlers(const proto2::FieldDescriptor* proto2_f,
const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetValueHandler<T>(f, UpbMakeHandlerT(Append<T>));
} else {
upb::Shim::Set(h, f, GetOffset(proto2_f, r), GetHasbit(proto2_f, r));
}
}
template <typename T>
static void Append(proto2::RepeatedField<T>* r, T val) {
// Proto1's ProtoArray class derives from proto2::RepeatedField.
r->Add(val);
}
// String ////////////////////////////////////////////////////////////////////
static void SetStringHandlers(const proto2::FieldDescriptor* proto2_f,
const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
h->SetStringHandler(f, UpbMakeHandler(OnStringBuf));
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetStartStringHandler(f, UpbMakeHandler(StartRepeatedString));
} else {
h->SetStartStringHandler(
f, UpbBind(StartString, new FieldOffset(proto2_f, r)));
}
}
static string* StartString(proto2::Message* m, const FieldOffset* info,
size_t size_hint) {
info->SetHasbit(m);
string* str = info->GetFieldPointer<string>(m);
str->clear();
// reserve() here appears to hurt performance rather than help.
return str;
}
static size_t OnStringBuf(string* s, const char* buf, size_t n) {
s->append(buf, n);
return n;
}
static string* StartRepeatedString(proto2::RepeatedPtrField<string>* r,
size_t size_hint) {
string* str = r->Add();
// reserve() here appears to hurt performance rather than help.
return str;
}
// Out-of-line string ////////////////////////////////////////////////////////
static void SetOutOfLineStringHandlers(
const proto2::FieldDescriptor* proto2_f, const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
// This type is only used for non-repeated string fields.
assert(!f->IsSequence());
h->SetStartStringHandler(
f, UpbBind(StartOutOfLineString, new FieldOffset(proto2_f, r)));
h->SetStringHandler(f, UpbMakeHandler(OnStringBuf));
}
static string* StartOutOfLineString(proto2::Message* m,
const FieldOffset* info,
size_t size_hint) {
info->SetHasbit(m);
string** str = info->GetFieldPointer<string*>(m);
if (*str == &::proto2::internal::GetEmptyString())
*str = new string();
(*str)->clear();
// reserve() here appears to hurt performance rather than help.
return *str;
}
// Cord //////////////////////////////////////////////////////////////////////
static void SetCordHandlers(const proto2::FieldDescriptor* proto2_f,
const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetStartStringHandler(f, UpbMakeHandler(StartRepeatedCord));
} else {
h->SetStartStringHandler(
f, UpbBind(StartCord, new FieldOffset(proto2_f, r)));
}
h->SetStringHandler(f, UpbMakeHandler(OnCordBuf));
}
static Cord* StartCord(proto2::Message* m, const FieldOffset* offset,
size_t size_hint) {
UPB_UNUSED(size_hint);
offset->SetHasbit(m);
Cord* field = offset->GetFieldPointer<Cord>(m);
field->Clear();
return field;
}
static void OnCordBuf(Cord* c, const char* buf, size_t n) {
c->Append(StringPiece(buf, n));
}
static Cord* StartRepeatedCord(proto2::RepeatedField<Cord>* r,
size_t size_hint) {
UPB_UNUSED(size_hint);
return r->Add();
}
// SubMessage ////////////////////////////////////////////////////////////////
class SubMessageHandlerData : public FieldOffset {
public:
SubMessageHandlerData(const proto2::Message& prototype,
const proto2::FieldDescriptor* f,
const _pi::Proto2Reflection* r)
: FieldOffset(f, r) {
prototype_ = GetWeakPrototype(prototype, f);
if (!prototype_) prototype_ = GetFieldPrototype(prototype, f);
}
const proto2::Message* prototype() const { return prototype_; }
private:
const proto2::Message* prototype_;
};
static void SetRequiredMessageHandlers(
const proto2::FieldDescriptor* proto2_f, const proto2::Message& m,
const _pi::Proto2Reflection* r, const upb::FieldDef* f,
upb::Handlers* h) {
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetStartSubMessageHandler(
f, UpbBind(StartRepeatedSubMessage,
new SubMessageHandlerData(m, proto2_f, r)));
} else {
h->SetStartSubMessageHandler(
f, UpbBind(StartRequiredSubMessage, new FieldOffset(proto2_f, r)));
}
}
static proto2::Message* StartRequiredSubMessage(proto2::Message* m,
const FieldOffset* offset) {
offset->SetHasbit(m);
return offset->GetFieldPointer<proto2::Message>(m);
}
static void SetMessageHandlers(const proto2::FieldDescriptor* proto2_f,
const proto2::Message& m,
const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
std::unique_ptr<SubMessageHandlerData> data(
new SubMessageHandlerData(m, proto2_f, r));
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetStartSubMessageHandler(
f, UpbBind(StartRepeatedSubMessage, data.release()));
} else {
h->SetStartSubMessageHandler(f, UpbBind(StartSubMessage, data.release()));
}
}
static void SetWeakMessageHandlers(const proto2::FieldDescriptor* proto2_f,
const proto2::Message& m,
const _pi::Proto2Reflection* r,
const upb::FieldDef* f, upb::Handlers* h) {
std::unique_ptr<SubMessageHandlerData> data(
new SubMessageHandlerData(m, proto2_f, r));
if (f->IsSequence()) {
SetStartSequenceHandler(proto2_f, r, f, h);
h->SetStartSubMessageHandler(
f, UpbBind(StartRepeatedSubMessage, data.release()));
} else {
h->SetStartSubMessageHandler(
f, UpbBind(StartWeakSubMessage, data.release()));
}
}
static void* StartSubMessage(void *m, const SubMessageHandlerData* info) {
info->SetHasbit(m);
proto2::Message** subm = info->GetFieldPointer<proto2::Message*>(m);
if (*subm == info->prototype()) *subm = (*subm)->New();
return *subm;
}
static void* StartWeakSubMessage(void* m, const SubMessageHandlerData* info) {
info->SetHasbit(m);
proto2::Message** subm = info->GetFieldPointer<proto2::Message*>(m);
if (*subm == NULL) {
*subm = info->prototype()->New();
}
return *subm;
}
class RepeatedMessageTypeHandler {
public:
typedef proto2::Message Type;
// AddAllocated() calls this, but only if other objects are sitting
// around waiting for reuse, which we will not do.
static void Delete(Type* t) {
UPB_UNUSED(t);
assert(false);
}
};
// Closure is a RepeatedPtrField<SubMessageType>*, but we access it through
// its base class RepeatedPtrFieldBase*.
static proto2::Message* StartRepeatedSubMessage(
proto2::internal::RepeatedPtrFieldBase* r,
const SubMessageHandlerData* info) {
proto2::Message* submsg = r->AddFromCleared<RepeatedMessageTypeHandler>();
if (!submsg) {
submsg = info->prototype()->New();
r->AddAllocated<RepeatedMessageTypeHandler>(submsg);
}
return submsg;
}
};
bool TrySetProto1WriteHandlers(const proto2::FieldDescriptor* proto2_f,
const proto2::Message& m,
const upb::FieldDef* upb_f, upb::Handlers* h) {
return P2R_Handlers::TrySet(proto2_f, m, upb_f, h);
}
const proto2::Message* GetProto1WeakPrototype(
const proto2::Message& m, const proto2::FieldDescriptor* f) {
return P2R_Handlers::GetWeakPrototype(m, f);
}
const proto2::Message* GetProto1FieldPrototype(
const proto2::Message& m, const proto2::FieldDescriptor* f) {
return P2R_Handlers::GetFieldPrototype(m, f);
}
} // namespace google
} // namespace upb
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