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classfile.cpp
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#include "classfile.h"
#include "boards/gamebuino.h"
#include "boost/algorithm/string.hpp"
#include <fstream>
enum
{
T_NONE = 0,
T_STRING = 1,
T_OBJECT = 2,
T_ARRAY = 3,
T_BOOLEAN = 4,
T_CHAR = 5,
T_FLOAT = 6,
T_DOUBLE = 7,
T_BYTE = 8,
T_SHORT = 9,
T_INT = 10,
T_LONG = 11,
};
std::string getType(int type)
{
switch (type)
{
case T_BOOLEAN: return "bool";
case T_CHAR: return "char";
case T_FLOAT: return "float";
case T_DOUBLE: return "double";
case T_BYTE: return "int8_t";
case T_SHORT: return "int16_t";
case T_INT: return "int32_t";
case T_LONG: return "int64_t";
}
throw fmt::format("Invalid type: '{}'.", type);
}
attribute_info readAttribute(Buffer & buffer)
{
attribute_info info;
info.attribute_name_index = r16();
auto length = r32();
info.attribute_length = length;
for (u4 i = 0; i < length; ++i)
{
info.info.push_back(r8());
}
return info;
}
std::string getTypeFromDescriptor(std::string descriptor, u8 flags)
{
int count = 0;
while (descriptor.size() && descriptor.front() == '[')
{
descriptor.erase(descriptor.begin());
++count;
}
std::string prefix;
std::string suffix;
if (flags & CONST_TYPE) prefix += "const ";
if (flags & UNSIGNED_TYPE) prefix += "u";
if (flags & POINTER_TYPE) suffix += "*";
if (descriptor == "I")
{
return prefix + "int32_t" + suffix;
}
if (descriptor == "B")
{
return prefix + "int8_t" + suffix;
}
if (descriptor == "S")
{
return prefix + "int16_t" + suffix;
}
if (descriptor == "Z")
{
return prefix + "bool" + suffix;
}
if (descriptor == "F")
{
return prefix + "float" + suffix;
}
if (descriptor.starts_with("L") && descriptor.ends_with(";"))
{
auto jt = descriptor.substr(1, descriptor.size() - 2);
if (jt.starts_with("types/"))
{
return jt.substr(6) + "_t";
}
return prefix + javaToCpp(jt) + suffix;
}
throw fmt::format("Invalid type used as a static field: '{}'.", descriptor);
}
template<class> inline constexpr bool always_false_v = false;
std::string getAsString(const Value & value)
{
return std::visit([](auto&& arg) {
using T = std::decay_t<decltype(arg)>;
if constexpr (std::is_same_v<T, int32_t>)
{
return fmt::format("{}", arg);
}
else if constexpr (std::is_same_v<T, int64_t>)
{
return fmt::format("{}L", arg);
}
else if constexpr (std::is_same_v<T, float>)
{
return fmt::format("{}", arg);
}
else if constexpr (std::is_same_v<T, double>)
{
return fmt::format("{}", arg);
}
else if constexpr (std::is_same_v<T, std::string>)
{
return arg;
}
else if constexpr (std::is_same_v<T, Array>)
{
std::string output;
for (size_t i = 0; i < arg.populate.size(); ++i)
{
if (i > 0)
{
output += ", ";
}
output += arg.populate[i];
}
return fmt::format("{{ {} }}", output);
}
else if constexpr (std::is_same_v<T, Object>)
{
return arg.type;
}
else
{
static_assert(always_false_v<T>, "non-exhaustive visitor!");
}
}, value);
}
std::string invertBinaryOperator(std::string binop)
{
if (binop == "!=") return "==";
if (binop == "==") return "!=";
if (binop == ">=") return "<";
if (binop == "<") return ">=";
if (binop == "<=") return ">";
if (binop == ">") return "<=";
throw fmt::format("'{}' is not a valid binary operator.", binop);
}
ClassFile::ClassFile(std::string filename, std::string projectName, bool partial)
{
project_name = projectName;
filePath = filename.substr(0, filename.rfind('.'));
if (filePath.starts_with("./"))
{
filePath = filePath.substr(2);
}
fileName = filePath;
if (fileName.contains("/"))
{
fileName = fileName.substr(fileName.rfind('/') + 1);
}
std::ifstream file(filePath + ".class", std::ios::binary);
assert(file.is_open());
file.seekg(0, std::ios::end);
auto fileSize = file.tellg();
file.seekg(0, std::ios::beg);
if (fileSize == 0)
{
throw fmt::format("File is empty.");
}
Buffer buffer(fileSize);
file.read((char*) &buffer[0], fileSize);
auto magic = r32();
if (magic != 0xCAFEBABE)
{
throw fmt::format("Invalid class file. Wrong magic number.");
}
[[maybe_unused]] auto minor = r16();
[[maybe_unused]] auto major = r16();
constantPool.push_back({});
auto constant_pool_count = r16();
for (int i = 0; i < constant_pool_count - 1; ++i)
{
auto tag = r8();
switch (tag)
{
case CONSTANT_Utf8:
{
auto length = r16();
Utf8 info;
info.length = length;
for (int i = 0; i < length; ++i)
{
info.bytes.push_back(r8());
}
constantPool.push_back(info);
break;
}
case CONSTANT_Integer:
{
auto v = s32();
constantPool.push_back(v);
break;
}
case CONSTANT_Float:
{
auto v = r32();
auto info = std::bit_cast<float>(v);
constantPool.push_back(info);
break;
}
case CONSTANT_Long:
{
auto h = r32();
auto l = r32();
s8 info = (s8{h} << 32) | l;
constantPool.push_back(info);
++i;
constantPool.push_back({});
break;
}
case CONSTANT_Double:
{
auto h = r32();
auto l = r32();
u8 v = (s8{h} << 32) | l;
auto info = std::bit_cast<double>(v);
constantPool.push_back(info);
++i;
constantPool.push_back({});
break;
}
case CONSTANT_Class:
{
Class info { r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_String:
{
String info { r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_Fieldref:
{
Fieldref info { r16(), r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_Methodref:
{
Methodref info { r16(), r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_InterfaceMethodref:
{
InterfaceMethodref info { r16(), r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_NameAndType:
{
NameAndType info { r16(), r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_MethodHandle:
{
MethodHandle info { r8(), r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_MethodType:
{
MethodType info { r16() };
constantPool.push_back(info);
break;
}
case CONSTANT_InvokeDynamic:
{
InvokeDynamic info { r16(), r16() };
constantPool.push_back(info);
break;
}
default:
throw fmt::format("Unknown constant type: '{}'.", tag);
}
}
auto access_flags = r16();
if (access_flags & ACC_INTERFACE) return;
[[maybe_unused]] auto this_class = r16();
[[maybe_unused]] auto super_class = r16(); // TODO: check if super_class is object
auto interfaces_count = r16();
if (interfaces_count != 0)
{
throw fmt::format("The class must not have any interfaces.");
}
auto fields_count = r16();
for (u2 i = 0; i < fields_count; ++i)
{
auto access_flags = r16();
auto name_index = r16();
auto descriptor_index = r16();
auto attributes_count = r16();
u8 flags = 0;
if (access_flags & ACC_FINAL)
{
flags += CONST_TYPE;
}
for (u2 i = 0; i < attributes_count; ++i)
{
auto attr = readAttribute(buffer);
auto attribute_name = getStringFromUtf8(attr.attribute_name_index);
if (attribute_name == "RuntimeInvisibleAnnotations")
{
auto buffer = attr.info;
auto num_annotations = r16();
for (u2 ii = 0; ii < num_annotations; ++ii)
{
auto type_index = r16();
auto type_name = getStringFromUtf8(type_index);
[[maybe_unused]] auto num_element_value_pairs = r16();
if (type_name == "Ltypes/unsigned;")
{
flags |= UNSIGNED_TYPE;
}
else if (type_name == "Ltypes/pointer;")
{
flags |= POINTER_TYPE;
}
}
}
}
auto name = getStringFromUtf8(name_index);
auto descriptor = getStringFromUtf8(descriptor_index);
fields.push_back({ name, getTypeFromDescriptor(descriptor, flags), descriptor[0] == '[', access_flags });
}
struct MethData
{
std::string name;
std::string descriptor;
u1 returnFlags; // return flag
std::vector<u1> flags; // parameters' flags
Buffer buffer;
};
std::vector<MethData> methodsToDecompile;
auto methods_count = r16();
for (int i = 0; i < methods_count; ++i)
{
[[maybe_unused]] auto access_flags = r16();
auto name_index = r16();
auto descriptor_index = r16();
auto attributes_count = r16();
std::vector<attribute_info> attributes;
for (u2 i = 0; i < attributes_count; ++i)
{
attributes.push_back(readAttribute(buffer));
}
auto name = getStringFromUtf8(name_index);
auto descriptor = getStringFromUtf8(descriptor_index);
auto flags = std::vector<u1>(countArgs(descriptor), u1{});
for (auto & attr : attributes)
{
auto attribute_name = getStringFromUtf8(attr.attribute_name_index);
if (attribute_name == "Code")
{
methodsToDecompile.push_back({ name, descriptor, 0, flags, attr.info });
}
else if (attribute_name == "LineNumberTable")
{
}
else if (attribute_name == "RuntimeInvisibleParameterAnnotations")
{
MethData * methData = nullptr;
for (auto & m : methodsToDecompile)
{
if (m.name == name)
{
methData = &m;
}
}
if (!methData)
{
methodsToDecompile.push_back({ name, descriptor, 0, flags, {} });
methData = &methodsToDecompile.back();
}
auto buffer = attr.info;
auto num_parameters = r8();
for (u2 ii = 0; ii < num_parameters; ++ii)
{
auto num_parameter_annotations = r16();
for (u2 iii = 0; iii < num_parameter_annotations; ++iii)
{
auto type_index = r16();
auto type_name = getStringFromUtf8(type_index);
[[maybe_unused]] auto num_element_value_pairs = r16();
if (type_name == "Ltypes/unsigned;")
{
auto flags = methData->flags[ii];
flags |= UNSIGNED_TYPE;
methData->flags[ii] = flags;
}
else if (type_name == "Ltypes/pointer;")
{
auto flags = methData->flags[ii];
flags |= POINTER_TYPE;
methData->flags[ii] = flags;
}
}
}
}
else if (attribute_name == "Signature")
{
// TODO?
}
else if (attribute_name == "RuntimeInvisibleAnnotations")
{
MethData * methData = nullptr;
for (auto & m : methodsToDecompile)
{
if (m.name == name)
{
methData = &m;
}
}
if (!methData)
{
methodsToDecompile.push_back({ name, descriptor, 0, flags, {} });
methData = &methodsToDecompile.back();
}
auto buffer = attr.info;
auto num_annotations = r16();
for (u2 ii = 0; ii < num_annotations; ++ii)
{
auto type_index = r16();
auto type_name = getStringFromUtf8(type_index);
[[maybe_unused]] auto num_element_value_pairs = r16();
if (type_name == "Ltypes/unsigned;")
{
methData->returnFlags |= UNSIGNED_TYPE;
}
else if (type_name == "Ltypes/pointer;")
{
methData->returnFlags |= POINTER_TYPE;
}
}
}
else
{
throw fmt::format("Unhandled method attribute: '{}'.", attribute_name);
}
}
if (attributes_count == 0)
{
methodsToDecompile.push_back({ name, descriptor, 0, flags, {} });
}
}
auto attributes_count = r16();
std::vector<attribute_info> attributes;
for (u2 i = 0; i < attributes_count; ++i)
{
attributes.push_back(readAttribute(buffer));
auto attribute_name = getStringFromUtf8(attributes.back().attribute_name_index);
if (attribute_name == "RuntimeInvisibleAnnotations")
{
auto buffer = attributes.back().info;
auto num_annotations = r16();
for (u2 ii = 0; ii < num_annotations; ++ii)
{
auto type_index = r16();
auto type_name = getStringFromUtf8(type_index);
auto num_element_value_pairs = r16();
for (u2 iii = 0; iii < num_element_value_pairs; ++iii)
{
auto element_name_index = r16();
auto element_name = getStringFromUtf8(element_name_index);
// value: element_value
[[maybe_unused]] auto tag = r8();
if (type_name == "Lboard/Board;" && element_name == "value")
{
auto type_name_index = r16();
auto type_name = getStringFromUtf8(type_name_index);
auto const_name_index = r16();
auto const_name = getStringFromUtf8(const_name_index);
if (type_name == "Lboard/Type;")
{
board_name = const_name;
}
else
{
throw fmt::format("Annotation '@Board' must contains a board.Type value.");
}
}
else if (type_name == "Lgamebuino/Config;")
{
auto const_value_index = r16();
auto constant = constantPool[const_value_index];
auto const_int = std::get<s4>(constant);
if (const_int >= 0)
{
if (element_name == "DisplayMode")
{
gbConfig["DISPLAY_MODE"] = const_int;
}
else if (element_name == "FontSize")
{
gbConfig["DEFAULT_FONT_SIZE"] = const_int;
}
else
{
throw fmt::format("Unknown field '{}' for annotation 'Config'.", element_name);
}
}
}
else if (type_name == "Lpimoroni/Picosystem;")
{
auto const_value_index = r16();
auto constant = constantPool[const_value_index];
bool boolean = std::get<int>(constant);
if (element_name == "DoublePixels")
{
if (boolean)
{
rawCMake.push_back("pixel_double(${PROJECT_NAME})"s);
}
}
else if (element_name == "StartupLogo")
{
if (!boolean)
{
rawCMake.push_back("disable_startup_logo(${PROJECT_NAME})"s);
}
}
else if (element_name == "SpriteSheet")
{
if (!boolean)
{
rawCMake.push_back("no_spritesheet(${PROJECT_NAME})"s);
}
}
else if (element_name == "Font")
{
if (!boolean)
{
rawCMake.push_back("no_font(${PROJECT_NAME})"s);
}
}
else if (element_name == "Overclock")
{
if (!boolean)
{
rawCMake.push_back("no_overclock(${PROJECT_NAME})"s);
}
}
else
{
throw fmt::format("Unknown field '{}' for annotation 'Picosystem'.", element_name);
}
}
else
{
throw fmt::format("Annotation '{}' is not supported.", type_name);
}
}
}
}
else if (attribute_name == "SourceFile")
{
}
else if (attribute_name == "BootstrapMethods")
{
auto buffer = attributes.back().info;
u2 num_bootstrap_methods = r16();
for (u2 ii = 0; ii < num_bootstrap_methods; ++ii)
{
u2 bootstrap_method_ref = r16();
auto bootstrap_method_handle = std::get<MethodHandle>(constantPool[bootstrap_method_ref]);
auto bootstrap_method = std::get<Methodref>(constantPool[bootstrap_method_handle.reference_index]);
auto bootstrap_className = getStringFromUtf8(std::get<Class>(constantPool[bootstrap_method.class_index]).name_index);
auto bootstrap_descriptor = getStringFromUtf8(std::get<NameAndType>(constantPool[bootstrap_method.name_and_type_index]).descriptor_index);
auto bootstrap_methodName = getStringFromUtf8(std::get<NameAndType>(constantPool[bootstrap_method.name_and_type_index]).name_index);
std::vector<std::string> args;
u2 num_bootstrap_arguments = r16();
for (u2 arg = 0; arg < num_bootstrap_arguments; ++arg)
{
u2 bootstrap_argument = r16();
auto bootstrap_pool = constantPool[bootstrap_argument];
if (std::holds_alternative<MethodHandle>(bootstrap_pool))
{
auto handle = std::get<MethodHandle>(bootstrap_pool);
if (handle.reference_kind != REF_invokeStatic)
{
throw fmt::format("Only static references are valid as a bootstrap method handle parameter.");
}
auto method = std::get<Methodref>(constantPool[handle.reference_index]);
auto className = getStringFromUtf8(std::get<Class>(constantPool[method.class_index]).name_index);
auto descriptor = getStringFromUtf8(std::get<NameAndType>(constantPool[method.name_and_type_index]).descriptor_index);
auto methodName = getStringFromUtf8(std::get<NameAndType>(constantPool[method.name_and_type_index]).name_index);
auto fullName = fmt::format("{}::{}", className, methodName);
std::string caster;
if (fullName == "ButtonBlinky::gpio_irq_callback")
{
caster = "(gpio_irq_callback_t)";
}
fullName = fmt::format("{}{}", caster, fullName);
fullName = javaToCpp(fullName);
args.push_back(fullName);
}
else if (std::holds_alternative<String>(bootstrap_pool))
{
auto data = std::get<String>(bootstrap_pool);
auto str = getStringFromUtf8(data.string_index);
args.push_back(str);
}
else if (std::holds_alternative<MethodType>(bootstrap_pool))
{
args.push_back("");
}
else
{
throw fmt::format("Unhandled parameter type for bootstrap method '{}' at index '{}'", bootstrap_methodName, arg);
}
}
if (bootstrap_methodName == "makeConcatWithConstants")
{
callbacksMethods.push_back(args[0]);
}
else if (bootstrap_methodName == "metafactory")
{
callbacksMethods.push_back(args[1]);
}
else
{
throw fmt::format("Unhandled bootstrap method: '{}'.", bootstrap_methodName);
}
}
}
else if (attribute_name == "InnerClasses")
{
}
else if (attribute_name == "Signature")
{
}
else
{
throw fmt::format("Unhandled class attribute: '{}'.", attribute_name);
}
}
for (auto & meth : methodsToDecompile)
{
auto name = meth.name;
auto skip = hasBoard() && name == CONSTRUCTOR;
if (!skip)
{
FunctionData funData;
funData.name = name;
funData.descriptor = meth.descriptor;
funData.returnFlags = meth.returnFlags;
funData.parametersFlags = meth.flags;
functions.push_back(funData);
}
}
if (partial)
{
return;
}
for (auto & meth : methodsToDecompile)
{
auto name = meth.name;
auto descriptor = meth.descriptor;
auto buffer = meth.buffer;
if (!buffer.size())
{
fmt::print("Function '{}' has no code.", name);
continue;
}
[[maybe_unused]] u2 max_stack = r16();
[[maybe_unused]] u2 max_locals = r16();
u4 code_length = r32();
Buffer code;
for (u4 i = 0; i < code_length; ++i)
{
code.push_back(r8());
}
u2 exception_table_length = r16();
for (u4 i = 0; i < exception_table_length; ++i)
{
[[maybe_unused]] u2 start_pc = r16();
[[maybe_unused]] u2 end_pc = r16();
[[maybe_unused]] u2 handler_pc = r16();
[[maybe_unused]] u2 catch_type = r16();
};
std::vector<std::tuple<u2, u2>> lineNumbers;
u2 attributes_count = r16();
for (u2 i = 0; i < attributes_count; ++i)
{
attributes.push_back(readAttribute(buffer));
auto attribute_name = getStringFromUtf8(attributes.back().attribute_name_index);
if (attribute_name == "LineNumberTable")
{
auto buffer = attributes.back().info;
u2 line_number_table_length = r16();
for (u2 a = 0; a < line_number_table_length; ++a)
{
u2 start_pc = r16();
u2 line_number = r16();
lineNumbers.emplace_back(start_pc, line_number);
}
}
else if (attribute_name == "StackMapTable")
{
}
else
{
throw fmt::format("Unhandled method attribute: '{}'.", attribute_name);
}
}
if (name == STATIC_INIT)
{
lineAnalyser(code, STATIC_INIT, lineNumbers);
}
else
{
auto skip = hasBoard() && name == CONSTRUCTOR;
if (!skip)
{
for (auto & funData : functions)
{
if (funData.name == name)
{
funData.instructions = lineAnalyser(code, name, lineNumbers);
break;
}
}
}
}
}
}
bool ClassFile::hasBoard() const
{
return board_name.size() > 0;
}
std::string ClassFile::boardName() const
{
return board_name;
}
void ClassFile::generate(const std::vector<ClassFile> & files, Board board)
{
std::ofstream output_h(fileName + ".h");
output_h << "#ifndef " << boost::to_upper_copy(fileName) << "_H\n"
<< "#define " << boost::to_upper_copy(fileName) << "_H\n";
if (board != Board::Gamebuino)
{
output_h << "#include \"pico-java.h\"\n"
<< "#if __has_include(\"" << RESOURCES_FILE << ".h\")\n"
<< "#include \"" << RESOURCES_FILE << ".h\"\n"
<< "#endif\n"
<< "#if __has_include(\"" << USER_FILE << ".h\")\n"
<< "#include \"" << USER_FILE << ".h\"\n"
<< "#endif\n";
for (auto & f : files)
{
if (f.fileName != fileName)
output_h << "#include \"" << f.fileName << ".h\"\n";
}
output_h << '\n';
}
if (!hasBoard())
{
output_h << "class " << fileName << " {\n"
<< "public:\n";
}
if (fields.size())
{
output_h << '\n';
for (auto & field : fields)
{
if (hasBoard())
{
if ((field.flags & ACC_PUBLIC) == 0) continue;
output_h << "extern ";
}
output_h << field.type;
if (!field.init.has_value() && field.isArray)
{
output_h << '*';
}
output_h << " " << field.name;
if (field.init.has_value())
{
if (field.isArray)
{
output_h << "[]";
}
if (!hasBoard() && field.init.value() != "null")
{
output_h << " = " << field.init.value();
}
}
output_h << ";\n";
}
}
for (auto & func : functions)
{
if (func.name == STATIC_INIT)
{
continue;
}
if (!hasBoard() || (func.flags & ACC_PUBLIC))
{
output_h << '\n';
if (func.name == CONSTRUCTOR)
{
output_h << fileName;
}
else
{
if ((func.flags & ACC_STATIC))
{
output_h << "static ";
}
output_h << getReturnType(func.descriptor, func.returnFlags) << " " << func.name;
}
output_h << "(" << generateParameters(func.descriptor, func.parametersFlags, true) << ");\n";
}
}
if (!hasBoard())
{
output_h << "};\n";
}
output_h << "#endif\n";
output_h.close();
std::string extension;
switch (board)
{
case Board::Gamebuino:
extension = "ino";
break;
default:
extension = "cpp";
break;
}
std::ofstream output_c(fileName + "." + extension);
if (hasBoard() || board != Board::Gamebuino)
{
switch (board)
{
case Board::Gamebuino:
output_c << "#include \"gamebuino-java.h\"\n";
break;
case Board::Picosystem:
output_c << "#include \"picosystem-java.h\"\n";
break;
default: // pico boards
output_c << "#include \"pico-java.h\"\n";
break;
}
output_c << "#if __has_include(\"" << RESOURCES_FILE << ".h\")\n"
<< "#include \"" << RESOURCES_FILE << ".h\"\n"
<< "#endif\n"
<< "#if __has_include(\"" << USER_FILE << ".h\")\n"
<< "#include \"" << USER_FILE << ".h\"\n"
<< "#endif\n";
for (auto & f : files)
{
if (!f.hasBoard())
{
output_c << "#include \"" << f.fileName << ".h\"\n";
}
}
}
if (hasBoard())
{
output_c << '\n';
for (auto & field : fields)
{
if ((field.flags & ACC_PUBLIC)) continue;
if (field.init.has_value() && field.init.value() == "null")
{
output_c << "extern ";
}