ASMJIT Code

class ErrorHandler : public asmjit::ErrorHandler {
public:
    void handleError(asmjit::Error error, const char* msg, asmjit::BaseEmitter* emitter) {
        std::cerr << error << ' ' << msg << '\n';
    }
};

struct object {
    uint64_t one;
    uint64_t two;
};

namespace x86 = asmjit::x86;

using map = std::unordered_map<std::string, object>;

object* get_from_table(map* table, std::string* str) {
    return &(*table)[*str];
}

int main() {
    std::unordered_map<std::string, object> table;
    std::string index = "Hello, world!";
    table[index] = { 1, 1 };

    asmjit::JitRuntime runtime;
    asmjit::CodeHolder code;
    code.init(runtime.environment());
    code.setErrorHandler(new ErrorHandler);
    x86::Compiler c(&code);

    c.addFunc(asmjit::FuncSignatureT<object*>());

    c.mov(x86::rax, (uint64_t)&table);
    c.mov(x86::rbx, (uint64_t)&index);

    asmjit::InvokeNode* node;
    c.invoke(&node, (uint64_t)get_from_table, asmjit::FuncSignatureT<object*, map*, std::string*>());
    node->setArg(0, x86::rax);
    node->setArg(1, x86::rbx);
    node->setRet(0, x86::rax);

    c.ret(x86::rax);
    c.endFunc();
    c.finalize();

    object* (*function)();

    runtime.add(&function, &code);

    function();
}