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#include <Python.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "pci.h"
#include "debug.h"
#include "pcilib.h"
#include "py.h"
#include "error.h"
struct pcilib_py_s {
PyObject *main_module;
PyObject *global_dict;
};
int pcilib_init_py(pcilib_t *ctx) {
ctx->py = (pcilib_py_t*)malloc(sizeof(pcilib_py_t));
if (!ctx->py) return PCILIB_ERROR_MEMORY;
Py_Initialize();
ctx->py->main_module = PyImport_AddModule("__parser__");
if (!ctx->py->main_module)
return PCILIB_ERROR_FAILED;
ctx->py->global_dict = PyModule_GetDict(ctx->py->main_module);
if (!ctx->py->global_dict)
return PCILIB_ERROR_FAILED;
return 0;
}
void pcilib_free_py(pcilib_t *ctx) {
if (ctx->py) {
// Dict and module references are borrowed
free(ctx->py);
ctx->py = NULL;
}
Py_Finalize();
}
/*
static int pcilib_py_realloc_string(pcilib_t *ctx, size_t required, size_t *size, char **str) {
char *ptr;
size_t cur = *size;
if ((required + 1) > cur) {
while (cur < required) cur *= 2;
ptr = (char*)realloc(*str, cur);
if (!ptr) return PCILIB_ERROR_MEMORY;
*size = cur;
*str = ptr;
}
]
return 0;
}
*/
static char *pcilib_py_parse_string(pcilib_t *ctx, const char *codestr, pcilib_value_t *value) {
int i;
int err = 0;
pcilib_value_t val = {0};
pcilib_register_value_t regval;
char save;
char *reg, *cur;
size_t offset = 0;
size_t size;
char *src;
char *dst;
size_t max_repl = 2 + 2 * sizeof(pcilib_value_t); // the text representation of largest integer
if (value) {
err = pcilib_copy_value(ctx, &val, value);
if (err) return NULL;
err = pcilib_convert_value_type(ctx, &val, PCILIB_TYPE_STRING);
if (err) return NULL;
if (strlen(val.sval) > max_repl)
max_repl = strlen(val.sval);
}
size = ((max_repl + 1) / 3 + 1) * strlen(codestr); // minimum register length is 3 symbols ($a + delimiter space), it is replaces with (max_repl+1) symbols
src = strdup(codestr);
dst = (char*)malloc(size); // allocating maximum required space
if ((!src)||(!dst)) {
if (src) free(src);
if (dst) free(dst);
pcilib_error("Failed to allocate memory for string formulas");
return NULL;
}
cur = src;
reg = strchr(src, '$');
while (reg) {
strcpy(dst + offset, cur);
offset += reg - cur;
// find the end of the register name
reg++;
if (*reg == '{') {
reg++;
for (i = 0; (reg[i])&&(reg[i] != '}'); i++);
if (!reg[i]) {
pcilib_error("Python formula (%s) contains unterminated variable reference", codestr);
err = PCILIB_ERROR_INVALID_DATA;
break;
}
} else {
for (i = 0; isalnum(reg[i])||(reg[i] == '_'); i++);
}
save = reg[i];
reg[i] = 0;
// determine replacement value
if (!strcasecmp(reg, "value")) {
if (!value) {
pcilib_error("Python formula (%s) relies on the value of register, but it is not provided", codestr);
err = PCILIB_ERROR_INVALID_REQUEST;
break;
}
strcpy(dst + offset, val.sval);
} else {
if (*reg == '/') {
pcilib_value_t val = {0};
err = pcilib_get_property(ctx, reg, &val);
if (err) break;
err = pcilib_convert_value_type(ctx, &val, PCILIB_TYPE_STRING);
if (err) break;
sprintf(dst + offset, "%s", val.sval);
} else {
err = pcilib_read_register(ctx, NULL, reg, ®val);
if (err) break;
sprintf(dst + offset, "0x%lx", regval);
}
}
offset += strlen(dst + offset);
if (save == '}') i++;
else reg[i] = save;
// Advance to the next register if any
cur = reg + i;
reg = strchr(cur, '$');
}
strcpy(dst + offset, cur);
free(src);
if (err) {
free(dst);
return NULL;
}
return dst;
}
int pcilib_py_eval_string(pcilib_t *ctx, const char *codestr, pcilib_value_t *value) {
PyGILState_STATE gstate;
char *code;
PyObject* obj;
code = pcilib_py_parse_string(ctx, codestr, value);
if (!code) {
pcilib_error("Failed to parse registers in the code: %s", codestr);
return PCILIB_ERROR_FAILED;
}
gstate = PyGILState_Ensure();
obj = PyRun_String(code, Py_eval_input, ctx->py->global_dict, ctx->py->global_dict);
PyGILState_Release(gstate);
if (!obj) {
pcilib_error("Failed to run the Python code: %s", code);
return PCILIB_ERROR_FAILED;
}
pcilib_debug(VIEWS, "Evaluating a Python string \'%s\' to %lf=\'%s\'", codestr, PyFloat_AsDouble(obj), code);
return pcilib_set_value_from_float(ctx, value, PyFloat_AsDouble(obj));
}
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