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t_cpp_generator.cc
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t_cpp_generator.cc
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// Copyright (c) 2006- Facebook
// Distributed under the Thrift Software License
//
// See accompanying file LICENSE or visit the Thrift site at:
// http://developers.facebook.com/thrift/
#include <cassert>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <boost/lexical_cast.hpp>
#include <sys/stat.h>
#include "platform.h"
#include "t_oop_generator.h"
using namespace std;
/**
* C++ code generator. This is legitimacy incarnate.
*
* @author Mark Slee <mcslee@facebook.com>
*/
class t_cpp_generator : public t_oop_generator {
public:
t_cpp_generator(
t_program* program,
const std::map<std::string, std::string>& parsed_options,
const std::string& option_string)
: t_oop_generator(program)
{
std::map<std::string, std::string>::const_iterator iter;
iter = parsed_options.find("dense");
gen_dense_ = (iter != parsed_options.end());
iter = parsed_options.find("include_prefix");
use_include_prefix_ = (iter != parsed_options.end());
iter = parsed_options.find("reflection_limited");
gen_reflection_limited_ = (iter != parsed_options.end());
out_dir_base_ = "gen-cpp";
}
/**
* Init and close methods
*/
void init_generator();
void close_generator();
void generate_consts(std::vector<t_const*> consts);
/**
* Program-level generation functions
*/
void generate_typedef(t_typedef* ttypedef);
void generate_enum(t_enum* tenum);
void generate_struct(t_struct* tstruct) {
generate_cpp_struct(tstruct, false);
}
void generate_xception(t_struct* txception) {
generate_cpp_struct(txception, true);
}
void generate_cpp_struct(t_struct* tstruct, bool is_exception);
void generate_service(t_service* tservice);
void print_const_value(std::ofstream& out, std::string name, t_type* type, t_const_value* value);
std::string render_const_value(std::ofstream& out, std::string name, t_type* type, t_const_value* value);
void generate_struct_definition (std::ofstream& out, t_struct* tstruct, bool is_exception=false, bool pointers=false, bool read=true, bool write=true);
void generate_struct_fingerprint (std::ofstream& out, t_struct* tstruct, bool is_definition);
void generate_struct_reader (std::ofstream& out, t_struct* tstruct, bool pointers=false);
void generate_struct_writer (std::ofstream& out, t_struct* tstruct, bool pointers=false);
void generate_struct_result_writer (std::ofstream& out, t_struct* tstruct, bool pointers=false);
/**
* Service-level generation functions
*/
void generate_service_interface (t_service* tservice);
void generate_service_null (t_service* tservice);
void generate_service_multiface (t_service* tservice);
void generate_service_helpers (t_service* tservice);
void generate_service_client (t_service* tservice);
void generate_service_processor (t_service* tservice);
void generate_service_skeleton (t_service* tservice);
void generate_process_function (t_service* tservice, t_function* tfunction);
void generate_function_helpers (t_service* tservice, t_function* tfunction);
void generate_service_limited_reflector(t_service* tservice);
bool generate_type_limited_reflection(t_type* ttype, std::string target);
bool generate_simple_type_limited_reflection(std::ostream& out, t_type* ttype, std::string target);
/**
* Serialization constructs
*/
void generate_deserialize_field (std::ofstream& out,
t_field* tfield,
std::string prefix="",
std::string suffix="");
void generate_deserialize_struct (std::ofstream& out,
t_struct* tstruct,
std::string prefix="");
void generate_deserialize_container (std::ofstream& out,
t_type* ttype,
std::string prefix="");
void generate_deserialize_set_element (std::ofstream& out,
t_set* tset,
std::string prefix="");
void generate_deserialize_map_element (std::ofstream& out,
t_map* tmap,
std::string prefix="");
void generate_deserialize_list_element (std::ofstream& out,
t_list* tlist,
std::string prefix,
bool push_back,
std::string index);
void generate_serialize_field (std::ofstream& out,
t_field* tfield,
std::string prefix="",
std::string suffix="");
void generate_serialize_struct (std::ofstream& out,
t_struct* tstruct,
std::string prefix="");
void generate_serialize_container (std::ofstream& out,
t_type* ttype,
std::string prefix="");
void generate_serialize_map_element (std::ofstream& out,
t_map* tmap,
std::string iter);
void generate_serialize_set_element (std::ofstream& out,
t_set* tmap,
std::string iter);
void generate_serialize_list_element (std::ofstream& out,
t_list* tlist,
std::string iter);
/**
* Helper rendering functions
*/
std::string namespace_prefix(std::string ns);
std::string namespace_open(std::string ns);
std::string namespace_close(std::string ns);
std::string type_name(t_type* ttype, bool in_typedef=false, bool arg=false);
std::string base_type_name(t_base_type::t_base tbase);
std::string declare_field(t_field* tfield, bool init=false, bool pointer=false, bool constant=false, bool reference=false);
std::string function_signature(t_function* tfunction, std::string prefix="", bool name_params=true);
std::string argument_list(t_struct* tstruct, bool name_params=true);
std::string type_to_enum(t_type* ttype);
std::string local_reflection_name(const char*, t_type* ttype, bool external=false);
// These handles checking gen_dense_ and checking for duplicates.
void generate_local_reflection(std::ofstream& out, t_type* ttype, bool is_definition);
void generate_local_reflection_pointer(std::ofstream& out, t_type* ttype);
bool is_complex_type(t_type* ttype) {
ttype = get_true_type(ttype);
return
ttype->is_container() ||
ttype->is_struct() ||
ttype->is_xception() ||
(ttype->is_base_type() && (((t_base_type*)ttype)->get_base() == t_base_type::TYPE_STRING));
}
void set_use_include_prefix(bool use_include_prefix) {
use_include_prefix_ = use_include_prefix;
}
private:
/**
* Returns the include prefix to use for a file generated by program, or the
* empty string if no include prefix should be used.
*/
std::string get_include_prefix(const t_program& program) const;
/**
* True iff we should generate limited reflectors for services.
*/
bool gen_reflection_limited_;
/**
* True iff we should generate local reflection metadata for TDenseProtocol.
*/
bool gen_dense_;
/**
* True iff we should use a path prefix in our #include statements for other
* thrift-generated header files.
*/
bool use_include_prefix_;
/**
* Strings for namespace, computed once up front then used directly
*/
std::string ns_open_;
std::string ns_close_;
/**
* File streams, stored here to avoid passing them as parameters to every
* function.
*/
std::ofstream f_types_;
std::ofstream f_types_impl_;
std::ofstream f_header_;
std::ofstream f_service_;
/**
* When generating local reflections, make sure we don't generate duplicates.
*/
std::set<std::string> reflected_fingerprints_;
};
/**
* Prepares for file generation by opening up the necessary file output
* streams.
*
* @param tprogram The program to generate
*/
void t_cpp_generator::init_generator() {
// Make output directory
MKDIR(get_out_dir().c_str());
// Make output file
string f_types_name = get_out_dir()+program_name_+"_types.h";
f_types_.open(f_types_name.c_str());
string f_types_impl_name = get_out_dir()+program_name_+"_types.cpp";
f_types_impl_.open(f_types_impl_name.c_str());
// Print header
f_types_ <<
autogen_comment();
f_types_impl_ <<
autogen_comment();
// Start ifndef
f_types_ <<
"#ifndef " << program_name_ << "_TYPES_H" << endl <<
"#define " << program_name_ << "_TYPES_H" << endl <<
endl;
// Include base types
f_types_ <<
"#include <Thrift.h>" << endl <<
"#include <reflection_limited_types.h>" << endl <<
"#include <protocol/TProtocol.h>" << endl <<
"#include <transport/TTransport.h>" << endl <<
endl;
// Include other Thrift includes
const vector<t_program*>& includes = program_->get_includes();
for (size_t i = 0; i < includes.size(); ++i) {
f_types_ <<
"#include \"" << get_include_prefix(*(includes[i])) <<
includes[i]->get_name() << "_types.h\"" << endl;
}
f_types_ << endl;
// Include custom headers
const vector<string>& cpp_includes = program_->get_cpp_includes();
for (size_t i = 0; i < cpp_includes.size(); ++i) {
if (cpp_includes[i][0] == '<') {
f_types_ <<
"#include " << cpp_includes[i] << endl;
} else {
f_types_ <<
"#include \"" << cpp_includes[i] << "\"" << endl;
}
}
f_types_ <<
endl;
// Include the types file
f_types_impl_ <<
"#include \"" << get_include_prefix(*get_program()) << program_name_ <<
"_types.h\"" << endl <<
endl;
// If we are generating local reflection metadata, we need to include
// the definition of TypeSpec.
if (gen_dense_) {
f_types_impl_ <<
"#include <TReflectionLocal.h>" << endl <<
endl;
}
// Open namespace
ns_open_ = namespace_open(program_->get_namespace("cpp"));
ns_close_ = namespace_close(program_->get_namespace("cpp"));
f_types_ <<
ns_open_ << endl <<
endl;
f_types_impl_ <<
ns_open_ << endl <<
endl;
}
/**
* Closes the output files.
*/
void t_cpp_generator::close_generator() {
// Close namespace
f_types_ <<
ns_close_ << endl <<
endl;
f_types_impl_ <<
ns_close_ << endl;
// Close ifndef
f_types_ <<
"#endif" << endl;
// Close output file
f_types_.close();
f_types_impl_.close();
}
/**
* Generates a typedef. This is just a simple 1-liner in C++
*
* @param ttypedef The type definition
*/
void t_cpp_generator::generate_typedef(t_typedef* ttypedef) {
f_types_ <<
indent() << "typedef " << type_name(ttypedef->get_type(), true) << " " << ttypedef->get_symbolic() << ";" << endl <<
endl;
}
/**
* Generates code for an enumerated type. In C++, this is essentially the same
* as the thrift definition itself, using the enum keyword in C++.
*
* @param tenum The enumeration
*/
void t_cpp_generator::generate_enum(t_enum* tenum) {
f_types_ <<
indent() << "enum " << tenum->get_name() << " {" << endl;
indent_up();
vector<t_enum_value*> constants = tenum->get_constants();
vector<t_enum_value*>::iterator c_iter;
bool first = true;
for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {
if (first) {
first = false;
} else {
f_types_ <<
"," << endl;
}
f_types_ <<
indent() << (*c_iter)->get_name();
if ((*c_iter)->has_value()) {
f_types_ <<
" = " << (*c_iter)->get_value();
}
}
indent_down();
f_types_ <<
endl <<
"};" << endl <<
endl;
generate_local_reflection(f_types_, tenum, false);
generate_local_reflection(f_types_impl_, tenum, true);
}
/**
* Generates a class that holds all the constants.
*/
void t_cpp_generator::generate_consts(std::vector<t_const*> consts) {
string f_consts_name = get_out_dir()+program_name_+"_constants.h";
ofstream f_consts;
f_consts.open(f_consts_name.c_str());
string f_consts_impl_name = get_out_dir()+program_name_+"_constants.cpp";
ofstream f_consts_impl;
f_consts_impl.open(f_consts_impl_name.c_str());
// Print header
f_consts <<
autogen_comment();
f_consts_impl <<
autogen_comment();
// Start ifndef
f_consts <<
"#ifndef " << program_name_ << "_CONSTANTS_H" << endl <<
"#define " << program_name_ << "_CONSTANTS_H" << endl <<
endl <<
"#include \"" << get_include_prefix(*get_program()) << program_name_ <<
"_types.h\"" << endl <<
endl <<
ns_open_ << endl <<
endl;
f_consts_impl <<
"#include \"" << get_include_prefix(*get_program()) << program_name_ <<
"_constants.h\"" << endl <<
endl <<
ns_open_ << endl <<
endl;
f_consts <<
"class " << program_name_ << "Constants {" << endl <<
" public:" << endl <<
" " << program_name_ << "Constants();" << endl <<
endl;
indent_up();
vector<t_const*>::iterator c_iter;
for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
string name = (*c_iter)->get_name();
t_type* type = (*c_iter)->get_type();
f_consts <<
indent() << type_name(type) << " " << name << ";" << endl;
}
indent_down();
f_consts <<
"};" << endl;
f_consts_impl <<
"const " << program_name_ << "Constants g_" << program_name_ << "_constants;" << endl <<
endl <<
program_name_ << "Constants::" << program_name_ << "Constants() {" << endl;
indent_up();
for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
print_const_value(f_consts_impl,
(*c_iter)->get_name(),
(*c_iter)->get_type(),
(*c_iter)->get_value());
}
indent_down();
indent(f_consts_impl) <<
"}" << endl;
f_consts <<
endl <<
"extern const " << program_name_ << "Constants g_" << program_name_ << "_constants;" << endl <<
endl <<
ns_close_ << endl <<
endl <<
"#endif" << endl;
f_consts.close();
f_consts_impl <<
endl <<
ns_close_ << endl <<
endl;
}
/**
* Prints the value of a constant with the given type. Note that type checking
* is NOT performed in this function as it is always run beforehand using the
* validate_types method in main.cc
*/
void t_cpp_generator::print_const_value(ofstream& out, string name, t_type* type, t_const_value* value) {
if (type->is_base_type()) {
string v2 = render_const_value(out, name, type, value);
indent(out) << name << " = " << v2 << ";" << endl <<
endl;
} else if (type->is_enum()) {
indent(out) << name << " = (" << type_name(type) << ")" << value->get_integer() << ";" << endl <<
endl;
} else if (type->is_struct() || type->is_xception()) {
const vector<t_field*>& fields = ((t_struct*)type)->get_members();
vector<t_field*>::const_iterator f_iter;
const map<t_const_value*, t_const_value*>& val = value->get_map();
map<t_const_value*, t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
t_type* field_type = NULL;
for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
if ((*f_iter)->get_name() == v_iter->first->get_string()) {
field_type = (*f_iter)->get_type();
}
}
if (field_type == NULL) {
throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();
}
string val = render_const_value(out, name, field_type, v_iter->second);
indent(out) << name << "." << v_iter->first->get_string() << " = " << val << ";" << endl;
indent(out) << name << ".__isset." << v_iter->first->get_string() << " = true;" << endl;
}
out << endl;
} else if (type->is_map()) {
t_type* ktype = ((t_map*)type)->get_key_type();
t_type* vtype = ((t_map*)type)->get_val_type();
const map<t_const_value*, t_const_value*>& val = value->get_map();
map<t_const_value*, t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
string key = render_const_value(out, name, ktype, v_iter->first);
string val = render_const_value(out, name, vtype, v_iter->second);
indent(out) << name << ".insert(std::make_pair(" << key << ", " << val << "));" << endl;
}
out << endl;
} else if (type->is_list()) {
t_type* etype = ((t_list*)type)->get_elem_type();
const vector<t_const_value*>& val = value->get_list();
vector<t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
string val = render_const_value(out, name, etype, *v_iter);
indent(out) << name << ".push_back(" << val << ");" << endl;
}
out << endl;
} else if (type->is_set()) {
t_type* etype = ((t_set*)type)->get_elem_type();
const vector<t_const_value*>& val = value->get_list();
vector<t_const_value*>::const_iterator v_iter;
for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
string val = render_const_value(out, name, etype, *v_iter);
indent(out) << name << ".insert(" << val << ");" << endl;
}
out << endl;
}
}
/**
*
*/
string t_cpp_generator::render_const_value(ofstream& out, string name, t_type* type, t_const_value* value) {
std::ostringstream render;
if (type->is_base_type()) {
t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
switch (tbase) {
case t_base_type::TYPE_STRING:
render << "\"" + value->get_string() + "\"";
break;
case t_base_type::TYPE_BOOL:
render << ((value->get_integer() > 0) ? "true" : "false");
break;
case t_base_type::TYPE_BYTE:
case t_base_type::TYPE_I16:
case t_base_type::TYPE_I32:
case t_base_type::TYPE_I64:
render << value->get_integer();
break;
case t_base_type::TYPE_DOUBLE:
if (value->get_type() == t_const_value::CV_INTEGER) {
render << value->get_integer();
} else {
render << value->get_double();
}
break;
default:
throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);
}
} else if (type->is_enum()) {
render << "(" << type_name(type) << ")" << value->get_integer();
} else {
string t = tmp("tmp");
indent(out) << type_name(type) << " " << t << ";" << endl;
print_const_value(out, t, type, value);
render << t;
}
return render.str();
}
/**
* Generates a struct definition for a thrift data type. This is a class
* with data members and a read/write() function, plus a mirroring isset
* inner class.
*
* @param tstruct The struct definition
*/
void t_cpp_generator::generate_cpp_struct(t_struct* tstruct, bool is_exception) {
generate_struct_definition(f_types_, tstruct, is_exception);
generate_struct_fingerprint(f_types_impl_, tstruct, true);
generate_local_reflection(f_types_, tstruct, false);
generate_local_reflection(f_types_impl_, tstruct, true);
generate_local_reflection_pointer(f_types_impl_, tstruct);
generate_struct_reader(f_types_impl_, tstruct);
generate_struct_writer(f_types_impl_, tstruct);
}
/**
* Writes the struct definition into the header file
*
* @param out Output stream
* @param tstruct The struct
*/
void t_cpp_generator::generate_struct_definition(ofstream& out,
t_struct* tstruct,
bool is_exception,
bool pointers,
bool read,
bool write) {
string extends = "";
if (is_exception) {
extends = " : public facebook::thrift::TException";
}
// Open struct def
out <<
indent() << "class " << tstruct->get_name() << extends << " {" << endl <<
indent() << " public:" << endl <<
endl;
indent_up();
// Put the fingerprint up top for all to see.
generate_struct_fingerprint(out, tstruct, false);
// Get members
vector<t_field*>::const_iterator m_iter;
const vector<t_field*>& members = tstruct->get_members();
if (!pointers) {
// Default constructor
indent(out) <<
tstruct->get_name() << "()";
bool init_ctor = false;
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
t_type* t = get_true_type((*m_iter)->get_type());
if (t->is_base_type()) {
string dval;
if (t->is_enum()) {
dval += "(" + type_name(t) + ")";
}
dval += t->is_string() ? "\"\"" : "0";
t_const_value* cv = (*m_iter)->get_value();
if (cv != NULL) {
dval = render_const_value(out, (*m_iter)->get_name(), t, cv);
}
if (!init_ctor) {
init_ctor = true;
out << " : ";
out << (*m_iter)->get_name() << "(" << dval << ")";
} else {
out << ", " << (*m_iter)->get_name() << "(" << dval << ")";
}
}
}
out << " {" << endl;
indent_up();
// TODO(dreiss): When everything else in Thrift is perfect,
// do more of these in the initializer list.
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
t_type* t = get_true_type((*m_iter)->get_type());
if (!t->is_base_type()) {
t_const_value* cv = (*m_iter)->get_value();
if (cv != NULL) {
print_const_value(out, (*m_iter)->get_name(), t, cv);
}
}
}
scope_down(out);
}
out <<
endl <<
indent() << "virtual ~" << tstruct->get_name() << "() throw() {}" << endl << endl;
// Pointer to this structure's reflection local typespec.
if (gen_dense_) {
indent(out) <<
"static facebook::thrift::reflection::local::TypeSpec* local_reflection;" <<
endl << endl;
}
// Declare all fields
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
indent(out) <<
declare_field(*m_iter, false, pointers && !(*m_iter)->get_type()->is_xception(), !read) << endl;
}
// Isset struct has boolean fields, but only for non-required fields.
bool has_nonrequired_fields = false;
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
if ((*m_iter)->get_req() != t_field::T_REQUIRED)
has_nonrequired_fields = true;
}
if (has_nonrequired_fields && (!pointers || read)) {
out <<
endl <<
indent() << "struct __isset {" << endl;
indent_up();
indent(out) <<
"__isset() : ";
bool first = true;
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
if ((*m_iter)->get_req() == t_field::T_REQUIRED) {
continue;
}
if (first) {
first = false;
out <<
(*m_iter)->get_name() << "(false)";
} else {
out <<
", " << (*m_iter)->get_name() << "(false)";
}
}
out << " {}" << endl;
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
if ((*m_iter)->get_req() != t_field::T_REQUIRED) {
indent(out) <<
"bool " << (*m_iter)->get_name() << ";" << endl;
}
}
indent_down();
indent(out) <<
"} __isset;" << endl;
}
out << endl;
if (!pointers) {
// Generate an equality testing operator. Make it inline since the compiler
// will do a better job than we would when deciding whether to inline it.
out <<
indent() << "bool operator == (const " << tstruct->get_name() << " & " <<
(members.size() > 0 ? "rhs" : "/* rhs */") << ") const" << endl;
scope_up(out);
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
// Most existing Thrift code does not use isset or optional/required,
// so we treat "default" fields as required.
if ((*m_iter)->get_req() != t_field::T_OPTIONAL) {
out <<
indent() << "if (!(" << (*m_iter)->get_name()
<< " == rhs." << (*m_iter)->get_name() << "))" << endl <<
indent() << " return false;" << endl;
} else {
out <<
indent() << "if (__isset." << (*m_iter)->get_name()
<< " != rhs.__isset." << (*m_iter)->get_name() << ")" << endl <<
indent() << " return false;" << endl <<
indent() << "else if (__isset." << (*m_iter)->get_name() << " && !("
<< (*m_iter)->get_name() << " == rhs." << (*m_iter)->get_name()
<< "))" << endl <<
indent() << " return false;" << endl;
}
}
indent(out) << "return true;" << endl;
scope_down(out);
out <<
indent() << "bool operator != (const " << tstruct->get_name() << " &rhs) const {" << endl <<
indent() << " return !(*this == rhs);" << endl <<
indent() << "}" << endl << endl;
// Generate the declaration of a less-than operator. This must be
// implemented by the application developer if they wish to use it. (They
// will get a link error if they try to use it without an implementation.)
out <<
indent() << "bool operator < (const "
<< tstruct->get_name() << " & ) const;" << endl << endl;
}
if (read) {
out <<
indent() << "uint32_t read(facebook::thrift::protocol::TProtocol* iprot);" << endl;
}
if (write) {
out <<
indent() << "uint32_t write(facebook::thrift::protocol::TProtocol* oprot) const;" << endl;
}
out << endl;
indent_down();
indent(out) <<
"};" << endl <<
endl;
}
/**
* Writes the fingerprint of a struct to either the header or implementation.
*
* @param out Output stream
* @param tstruct The struct
*/
void t_cpp_generator::generate_struct_fingerprint(ofstream& out,
t_struct* tstruct,
bool is_definition) {
string stat, nspace, comment;
if (is_definition) {
stat = "";
nspace = tstruct->get_name() + "::";
comment = " ";
} else {
stat = "static ";
nspace = "";
comment = "; // ";
}
if (tstruct->has_fingerprint()) {
out <<
indent() << stat << "const char* " << nspace
<< "ascii_fingerprint" << comment << "= \"" <<
tstruct->get_ascii_fingerprint() << "\";" << endl <<
indent() << stat << "const uint8_t " << nspace <<
"binary_fingerprint[" << t_type::fingerprint_len << "]" << comment << "= {";
char* comma = "";
for (int i = 0; i < t_type::fingerprint_len; i++) {
out << comma << "0x" << t_struct::byte_to_hex(tstruct->get_binary_fingerprint()[i]);
comma = ",";
}
out << "};" << endl << endl;
}
}
/**
* Writes the local reflection of a type (either declaration or definition).
*/
void t_cpp_generator::generate_local_reflection(std::ofstream& out,
t_type* ttype,
bool is_definition) {
if (!gen_dense_) {
return;
}
ttype = get_true_type(ttype);
assert(ttype->has_fingerprint());
string key = ttype->get_ascii_fingerprint() + (is_definition ? "-defn" : "-decl");
// Note that we have generated this fingerprint. If we already did, bail out.
if (!reflected_fingerprints_.insert(key).second) {
return;
}
// Let each program handle its own structures.
if (ttype->get_program() != NULL && ttype->get_program() != program_) {
return;
}
// Do dependencies.
if (ttype->is_list()) {
generate_local_reflection(out, ((t_list*)ttype)->get_elem_type(), is_definition);
} else if (ttype->is_set()) {
generate_local_reflection(out, ((t_set*)ttype)->get_elem_type(), is_definition);
} else if (ttype->is_map()) {
generate_local_reflection(out, ((t_map*)ttype)->get_key_type(), is_definition);
generate_local_reflection(out, ((t_map*)ttype)->get_val_type(), is_definition);
} else if (ttype->is_struct() || ttype->is_xception()) {
// Hacky hacky. For efficiency and convenience, we need a dummy "T_STOP"
// type at the end of our typespec array. Unfortunately, there is no
// T_STOP type, so we use the global void type, and special case it when
// generating its typespec.
const vector<t_field*>& members = ((t_struct*)ttype)->get_members();
vector<t_field*>::const_iterator m_iter;
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
generate_local_reflection(out, (**m_iter).get_type(), is_definition);
}
generate_local_reflection(out, g_type_void, is_definition);
// For definitions of structures, do the arrays of metas and field specs also.
if (is_definition) {
out <<
indent() << "facebook::thrift::reflection::local::FieldMeta" << endl <<
indent() << local_reflection_name("metas", ttype) <<"[] = {" << endl;
indent_up();
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
indent(out) << "{ " << (*m_iter)->get_key() << ", " <<
(((*m_iter)->get_req() == t_field::T_OPTIONAL) ? "true" : "false") <<
" }," << endl;
}
// Zero for the T_STOP marker.
indent(out) << "{ 0, false }" << endl << "};" << endl;
indent_down();
out <<
indent() << "facebook::thrift::reflection::local::TypeSpec*" << endl <<
indent() << local_reflection_name("specs", ttype) <<"[] = {" << endl;
indent_up();
for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
indent(out) << "&" <<
local_reflection_name("typespec", (*m_iter)->get_type(), true) << "," << endl;
}
indent(out) << "&" <<
local_reflection_name("typespec", g_type_void) << "," << endl;
indent_down();
indent(out) << "};" << endl;
}
}
out <<
indent() << "// " << ttype->get_fingerprint_material() << endl <<
indent() << (is_definition ? "" : "extern ") <<
"facebook::thrift::reflection::local::TypeSpec" << endl <<
local_reflection_name("typespec", ttype) <<
(is_definition ? "(" : ";") << endl;
if (!is_definition) {
out << endl;
return;
}
indent_up();
if (ttype->is_void()) {
indent(out) << "facebook::thrift::protocol::T_STOP";
} else {
indent(out) << type_to_enum(ttype);
}
if (ttype->is_struct()) {
out << "," << endl <<
indent() << type_name(ttype) << "::binary_fingerprint," << endl <<
indent() << local_reflection_name("metas", ttype) << "," << endl <<
indent() << local_reflection_name("specs", ttype);
} else if (ttype->is_list()) {
out << "," << endl <<
indent() << "&" << local_reflection_name("typespec", ((t_list*)ttype)->get_elem_type()) << "," << endl <<
indent() << "NULL";
} else if (ttype->is_set()) {
out << "," << endl <<
indent() << "&" << local_reflection_name("typespec", ((t_set*)ttype)->get_elem_type()) << "," << endl <<
indent() << "NULL";
} else if (ttype->is_map()) {
out << "," << endl <<
indent() << "&" << local_reflection_name("typespec", ((t_map*)ttype)->get_key_type()) << "," << endl <<
indent() << "&" << local_reflection_name("typespec", ((t_map*)ttype)->get_val_type());
}
out << ");" << endl << endl;
indent_down();
}
/**
* Writes the structure's static pointer to its local reflection typespec
* into the implementation file.
*/
void t_cpp_generator::generate_local_reflection_pointer(std::ofstream& out,
t_type* ttype) {
if (!gen_dense_) {
return;
}
indent(out) <<
"facebook::thrift::reflection::local::TypeSpec* " <<
ttype->get_name() << "::local_reflection = " << endl <<
indent() << " &" << local_reflection_name("typespec", ttype) << ";" <<
endl << endl;
}
/**
* Makes a helper function to gen a struct reader.
*
* @param out Stream to write to
* @param tstruct The struct
*/
void t_cpp_generator::generate_struct_reader(ofstream& out,
t_struct* tstruct,
bool pointers) {
indent(out) <<
"uint32_t " << tstruct->get_name() << "::read(facebook::thrift::protocol::TProtocol* iprot) {" << endl;
indent_up();
const vector<t_field*>& fields = tstruct->get_members();
vector<t_field*>::const_iterator f_iter;
// Declare stack tmp variables
out <<
endl <<
indent() << "uint32_t xfer = 0;" << endl <<
indent() << "std::string fname;" << endl <<
indent() << "facebook::thrift::protocol::TType ftype;" << endl <<
indent() << "int16_t fid;" << endl <<
endl <<
indent() << "xfer += iprot->readStructBegin(fname);" << endl <<
endl <<
indent() << "using facebook::thrift::protocol::TProtocolException;" << endl <<
endl;
// Required variables aren't in __isset, so we need tmp vars to check them.
for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
if ((*f_iter)->get_req() == t_field::T_REQUIRED)
indent(out) << "bool isset_" << (*f_iter)->get_name() << " = false;" << endl;
}
out << endl;