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ladybird/DevTools/IPCCompiler/main.cpp

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/BufferStream.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/StringBuilder.h>
#include <LibCore/File.h>
#include <ctype.h>
#include <stdio.h>
//#define GENERATE_DEBUG_CODE
struct Parameter {
String type;
String name;
};
struct Message {
String name;
bool is_synchronous { false };
Vector<Parameter> inputs;
Vector<Parameter> outputs;
String response_name() const
{
StringBuilder builder;
builder.append(name);
builder.append("Response");
return builder.to_string();
}
};
struct Endpoint {
String name;
int magic;
Vector<Message> messages;
};
int main(int argc, char** argv)
{
if (argc != 2) {
printf("usage: %s <IPC endpoint definition file>\n", argv[0]);
return 0;
}
auto file = Core::File::construct(argv[1]);
if (!file->open(Core::IODevice::ReadOnly)) {
fprintf(stderr, "Error: Cannot open %s: %s\n", argv[1], file->error_string());
return 1;
}
auto file_contents = file->read_all();
Vector<Endpoint> endpoints;
Vector<char> buffer;
size_t index = 0;
auto peek = [&](size_t offset = 0) -> char {
if ((index + offset) < file_contents.size())
return file_contents[index + offset];
return 0;
};
auto consume_one = [&]() -> char {
return file_contents[index++];
};
auto extract_while = [&](Function<bool(char)> condition) -> String {
StringBuilder builder;
while (condition(peek()))
builder.append(consume_one());
return builder.to_string();
};
auto consume_specific = [&](char ch) {
if (peek() != ch) {
dbg() << "consume_specific: wanted '" << ch << "', but got '" << peek() << "' at index " << index;
}
ASSERT(peek() == ch);
++index;
return ch;
};
auto consume_string = [&](const char* str) {
for (size_t i = 0, length = strlen(str); i < length; ++i)
consume_specific(str[i]);
};
auto consume_whitespace = [&] {
while (isspace(peek()))
++index;
if (peek() == '/' && peek(1) == '/') {
while (peek() != '\n')
++index;
}
};
auto parse_parameter = [&](Vector<Parameter>& storage) {
for (;;) {
Parameter parameter;
consume_whitespace();
if (peek() == ')')
break;
parameter.type = extract_while([](char ch) { return !isspace(ch); });
consume_whitespace();
parameter.name = extract_while([](char ch) { return !isspace(ch) && ch != ',' && ch != ')'; });
consume_whitespace();
storage.append(move(parameter));
if (peek() == ',') {
consume_one();
continue;
}
if (peek() == ')')
break;
}
};
auto parse_parameters = [&](Vector<Parameter>& storage) {
for (;;) {
consume_whitespace();
parse_parameter(storage);
consume_whitespace();
if (peek() == ',') {
consume_one();
continue;
}
if (peek() == ')')
break;
}
};
auto parse_message = [&] {
Message message;
consume_whitespace();
Vector<char> buffer;
while (!isspace(peek()) && peek() != '(')
buffer.append(consume_one());
message.name = String::copy(buffer);
consume_whitespace();
consume_specific('(');
parse_parameters(message.inputs);
consume_specific(')');
consume_whitespace();
consume_specific('=');
auto type = consume_one();
if (type == '>')
message.is_synchronous = true;
else if (type == '|')
message.is_synchronous = false;
else
ASSERT_NOT_REACHED();
consume_whitespace();
if (message.is_synchronous) {
consume_specific('(');
parse_parameters(message.outputs);
consume_specific(')');
}
consume_whitespace();
endpoints.last().messages.append(move(message));
};
auto parse_messages = [&] {
for (;;) {
consume_whitespace();
parse_message();
consume_whitespace();
if (peek() == '}')
break;
}
};
auto parse_endpoint = [&] {
endpoints.empend();
consume_whitespace();
consume_string("endpoint");
consume_whitespace();
endpoints.last().name = extract_while([](char ch) { return !isspace(ch); });
consume_whitespace();
consume_specific('=');
consume_whitespace();
auto magic_string = extract_while([](char ch) { return !isspace(ch) && ch != '{'; });
bool ok;
endpoints.last().magic = magic_string.to_int(ok);
ASSERT(ok);
consume_whitespace();
consume_specific('{');
parse_messages();
consume_specific('}');
consume_whitespace();
};
while (index < file_contents.size())
parse_endpoint();
dbg() << "#pragma once";
dbg() << "#include <AK/BufferStream.h>";
dbg() << "#include <AK/OwnPtr.h>";
dbg() << "#include <LibGfx/Color.h>";
dbg() << "#include <LibGfx/Rect.h>";
dbg() << "#include <LibIPC/Decoder.h>";
dbg() << "#include <LibIPC/Encoder.h>";
dbg() << "#include <LibIPC/Endpoint.h>";
dbg() << "#include <LibIPC/Message.h>";
dbg();
for (auto& endpoint : endpoints) {
dbg() << "namespace Messages {";
dbg() << "namespace " << endpoint.name << " {";
dbg();
HashMap<String, int> message_ids;
dbg() << "enum class MessageID : i32 {";
for (auto& message : endpoint.messages) {
message_ids.set(message.name, message_ids.size() + 1);
dbg() << " " << message.name << " = " << message_ids.size() << ",";
if (message.is_synchronous) {
message_ids.set(message.response_name(), message_ids.size() + 1);
dbg() << " " << message.response_name() << " = " << message_ids.size() << ",";
}
}
dbg() << "};";
dbg();
auto constructor_for_message = [&](const String& name, const Vector<Parameter>& parameters) {
StringBuilder builder;
builder.append(name);
if (parameters.is_empty()) {
builder.append("() {}");
return builder.to_string();
}
builder.append('(');
for (size_t i = 0; i < parameters.size(); ++i) {
auto& parameter = parameters[i];
builder.append("const ");
builder.append(parameter.type);
builder.append("& ");
builder.append(parameter.name);
if (i != parameters.size() - 1)
builder.append(", ");
}
builder.append(") : ");
for (size_t i = 0; i < parameters.size(); ++i) {
auto& parameter = parameters[i];
builder.append("m_");
builder.append(parameter.name);
builder.append("(");
builder.append(parameter.name);
builder.append(")");
if (i != parameters.size() - 1)
builder.append(", ");
}
builder.append(" {}");
return builder.to_string();
};
auto do_message = [&](const String& name, const Vector<Parameter>& parameters, const String& response_type = {}) {
dbg() << "class " << name << " final : public IPC::Message {";
dbg() << "public:";
if (!response_type.is_null())
dbg() << " typedef class " << response_type << " ResponseType;";
dbg() << " " << constructor_for_message(name, parameters);
dbg() << " virtual ~" << name << "() override {}";
dbg() << " virtual i32 endpoint_magic() const override { return " << endpoint.magic << "; }";
dbg() << " virtual i32 message_id() const override { return (int)MessageID::" << name << "; }";
dbg() << " static i32 static_message_id() { return (int)MessageID::" << name << "; }";
dbg() << " virtual const char* message_name() const override { return \"" << endpoint.name << "::" << name << "\"; }";
dbg() << " static OwnPtr<" << name << "> decode(BufferStream& stream, size_t& size_in_bytes)";
dbg() << " {";
dbg() << " IPC::Decoder decoder(stream);";
for (auto& parameter : parameters) {
String initial_value = "{}";
if (parameter.type == "bool")
initial_value = "false";
dbg() << " " << parameter.type << " " << parameter.name << " = " << initial_value << ";";
if (parameter.type == "Vector<Gfx::Rect>") {
dbg() << " u64 " << parameter.name << "_size = 0;";
dbg() << " stream >> " << parameter.name << "_size;";
dbg() << " for (size_t i = 0; i < " << parameter.name << "_size; ++i) {";
dbg() << " Gfx::Rect rect;";
dbg() << " if (!decoder.decode(rect))";
dbg() << " return nullptr;";
dbg() << " " << parameter.name << ".append(move(rect));";
dbg() << " }";
} else {
dbg() << " if (!decoder.decode(" << parameter.name << "))";
dbg() << " return nullptr;";
}
}
StringBuilder builder;
for (size_t i = 0; i < parameters.size(); ++i) {
auto& parameter = parameters[i];
builder.append(parameter.name);
if (i != parameters.size() - 1)
builder.append(", ");
}
dbg() << " size_in_bytes = stream.offset();";
dbg() << " return make<" << name << ">(" << builder.to_string() << ");";
dbg() << " }";
dbg() << " virtual IPC::MessageBuffer encode() const override";
dbg() << " {";
dbg() << " IPC::MessageBuffer buffer;";
dbg() << " IPC::Encoder stream(buffer);";
dbg() << " stream << endpoint_magic();";
dbg() << " stream << (int)MessageID::" << name << ";";
for (auto& parameter : parameters) {
if (parameter.type == "Gfx::Color") {
dbg() << " stream << m_" << parameter.name << ".value();";
} else if (parameter.type == "Gfx::Size") {
dbg() << " stream << m_" << parameter.name << ".width();";
dbg() << " stream << m_" << parameter.name << ".height();";
} else if (parameter.type == "Gfx::Point") {
dbg() << " stream << m_" << parameter.name << ".x();";
dbg() << " stream << m_" << parameter.name << ".y();";
} else if (parameter.type == "Gfx::Rect") {
dbg() << " stream << m_" << parameter.name << ".x();";
dbg() << " stream << m_" << parameter.name << ".y();";
dbg() << " stream << m_" << parameter.name << ".width();";
dbg() << " stream << m_" << parameter.name << ".height();";
} else if (parameter.type == "Vector<Gfx::Rect>") {
dbg() << " stream << (u64)m_" << parameter.name << ".size();";
dbg() << " for (auto& rect : m_" << parameter.name << ") {";
dbg() << " stream << rect.x();";
dbg() << " stream << rect.y();";
dbg() << " stream << rect.width();";
dbg() << " stream << rect.height();";
dbg() << " }";
} else {
dbg() << " stream << m_" << parameter.name << ";";
}
}
dbg() << " return buffer;";
dbg() << " }";
for (auto& parameter : parameters) {
dbg() << " const " << parameter.type << "& " << parameter.name << "() const { return m_" << parameter.name << "; }";
}
dbg() << "private:";
for (auto& parameter : parameters) {
dbg() << " " << parameter.type << " m_" << parameter.name << ";";
}
dbg() << "};";
dbg();
};
for (auto& message : endpoint.messages) {
String response_name;
if (message.is_synchronous) {
response_name = message.response_name();
do_message(response_name, message.outputs);
}
do_message(message.name, message.inputs, response_name);
}
dbg() << "} // namespace " << endpoint.name;
dbg() << "} // namespace Messages";
dbg();
dbg() << "class " << endpoint.name << "Endpoint : public IPC::Endpoint {";
dbg() << "public:";
dbg() << " " << endpoint.name << "Endpoint() {}";
dbg() << " virtual ~" << endpoint.name << "Endpoint() override {}";
dbg() << " static int static_magic() { return " << endpoint.magic << "; }";
dbg() << " virtual int magic() const override { return " << endpoint.magic << "; }";
dbg() << " static String static_name() { return \"" << endpoint.name << "\"; };";
dbg() << " virtual String name() const override { return \"" << endpoint.name << "\"; };";
dbg() << " static OwnPtr<IPC::Message> decode_message(const ByteBuffer& buffer, size_t& size_in_bytes)";
dbg() << " {";
dbg() << " BufferStream stream(const_cast<ByteBuffer&>(buffer));";
dbg() << " i32 message_endpoint_magic = 0;";
dbg() << " stream >> message_endpoint_magic;";
dbg() << " if (message_endpoint_magic != " << endpoint.magic << ") {";
#ifdef GENERATE_DEBUG_CODE
dbg() << " dbg() << \"endpoint magic \" << message_endpoint_magic << \" != " << endpoint.magic << "\";";
#endif
dbg() << " return nullptr;";
dbg() << " }";
dbg() << " i32 message_id = 0;";
dbg() << " stream >> message_id;";
dbg() << " switch (message_id) {";
for (auto& message : endpoint.messages) {
auto do_decode_message = [&](const String& name) {
dbg() << " case (int)Messages::" << endpoint.name << "::MessageID::" << name << ":";
dbg() << " return Messages::" << endpoint.name << "::" << name << "::decode(stream, size_in_bytes);";
};
do_decode_message(message.name);
if (message.is_synchronous)
do_decode_message(message.response_name());
}
dbg() << " default:";
#ifdef GENERATE_DEBUG_CODE
dbg() << " dbg() << \"Failed to decode " << endpoint.name << ".(\" << message_id << \")\";";
#endif
dbg() << " return nullptr;";
dbg() << " }";
dbg() << " }";
dbg();
dbg() << " virtual OwnPtr<IPC::Message> handle(const IPC::Message& message) override";
dbg() << " {";
dbg() << " switch (message.message_id()) {";
for (auto& message : endpoint.messages) {
auto do_decode_message = [&](const String& name, bool returns_something) {
dbg() << " case (int)Messages::" << endpoint.name << "::MessageID::" << name << ":";
if (returns_something) {
dbg() << " return handle(static_cast<const Messages::" << endpoint.name << "::" << name << "&>(message));";
} else {
dbg() << " handle(static_cast<const Messages::" << endpoint.name << "::" << name << "&>(message));";
dbg() << " return nullptr;";
}
};
do_decode_message(message.name, message.is_synchronous);
if (message.is_synchronous)
do_decode_message(message.response_name(), false);
}
dbg() << " default:";
dbg() << " return nullptr;";
dbg() << " }";
dbg() << " }";
for (auto& message : endpoint.messages) {
String return_type = "void";
if (message.is_synchronous) {
StringBuilder builder;
builder.append("OwnPtr<Messages::");
builder.append(endpoint.name);
builder.append("::");
builder.append(message.name);
builder.append("Response");
builder.append(">");
return_type = builder.to_string();
}
dbg() << " virtual " << return_type << " handle(const Messages::" << endpoint.name << "::" << message.name << "&) = 0;";
}
dbg() << "private:";
dbg() << "};";
}
#ifdef DEBUG
for (auto& endpoint : endpoints) {
dbg() << "Endpoint: '" << endpoint.name << "' (magic: " << endpoint.magic << ")";
for (auto& message : endpoint.messages) {
dbg() << " Message: '" << message.name << "'";
dbg() << " Sync: " << message.is_synchronous;
dbg() << " Inputs:";
for (auto& parameter : message.inputs)
dbg() << " Parameter: " << parameter.name << " (" << parameter.type << ")";
if (message.inputs.is_empty())
dbg() << " (none)";
if (message.is_synchronous) {
dbg() << " Outputs:";
for (auto& parameter : message.outputs)
dbg() << " Parameter: " << parameter.name << " (" << parameter.type << ")";
if (message.outputs.is_empty())
dbg() << " (none)";
}
}
}
#endif
return 0;
}
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