44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
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#include <memory>
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#include <dlfcn.h>
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#include "eval_cpp.h"
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#include "util.h"
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#include "log.h"
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#include "file.h"
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#include "show.h"
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Eval_cpp::Eval_cpp(Machine& machine, Locator loc)
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: m_machine(machine)
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, m_loc(loc)
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{
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(void)K::log(3);
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}
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std::string Eval_cpp::eval(fs::path library_path, std::string function_name)
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{
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(void)K::log(3, library_path, function_name);
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// msg() << "library path: " << library_path.string().c_str() << "\n";
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void* handle = dlopen(library_path.string().c_str(), RTLD_LAZY);
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if (!handle) {
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const char* error = dlerror();
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std::string error_desc = error ? error : "unknown error";
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throw File_error("Cannot open library: " + library_path.string() + "\n " + error_desc, m_loc);
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}
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dlerror();
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typedef std::string (*func_t)(Machine);
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func_t func = (func_t) dlsym(handle, function_name.c_str());
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const char* dlsym_error = dlerror();
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if (dlsym_error) {
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std::string error_desc(dlsym_error);
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dlclose(handle);
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std::stringstream ss {};
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ss << "Cannot load symbol " << function_name
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<< " from library " << library_path << ":\n " << error_desc;
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throw File_error(ss.str(), m_loc, false);
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}
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std::string result = func(m_machine);
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dlclose(handle);
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return result;
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}
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