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#include "PythonReadline.h"
#ifdef LLDB_USE_LIBEDIT_READLINE_COMPAT_MODULE
#include <cstdio>
#include <editline/readline.h>
// Simple implementation of the Python readline module using libedit.
// In the event that libedit is excluded from the build, this turns
// back into a null implementation that blocks the module from pulling
// in the GNU readline shared lib, which causes linkage confusion when
// both readline and libedit's readline compatibility symbols collide.
//
// Currently it only installs a PyOS_ReadlineFunctionPointer, without
// implementing any of the readline module methods. This is meant to
// work around LLVM pr18841 to avoid seg faults in the stock Python
// readline.so linked against GNU readline.
//
// Bug on the cpython side: https://bugs.python.org/issue38634
PyDoc_STRVAR(moduleDocumentation,
"Simple readline module implementation based on libedit.");
static struct PyModuleDef readline_module = {
PyModuleDef_HEAD_INIT, // m_base
"lldb_editline", // m_name
moduleDocumentation, // m_doc
-1, // m_size
nullptr, // m_methods
nullptr, // m_reload
nullptr, // m_traverse
nullptr, // m_clear
nullptr, // m_free
};
static char *simple_readline(FILE *stdin, FILE *stdout, const char *prompt) {
rl_instream = stdin;
rl_outstream = stdout;
char *line = readline(prompt);
if (!line) {
char *ret = (char *)PyMem_RawMalloc(1);
if (ret != nullptr)
*ret = '\0';
return ret;
}
if (*line)
add_history(line);
int n = strlen(line);
char *ret = (char *)PyMem_RawMalloc(n + 2);
if (ret) {
memcpy(ret, line, n);
free(line);
ret[n] = '\n';
ret[n + 1] = '\0';
}
return ret;
}
PyMODINIT_FUNC initlldb_readline(void) {
PyOS_ReadlineFunctionPointer = simple_readline;
return PyModule_Create(&readline_module);
}
#endif
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