WIP.using libffi for calling xobjects now.

1 files changed, 101 insertions, 0 deletions

diff --git a/bruiser/bruiserffi.c b/bruiser/bruiserffi.c
new file mode 100644
index 0000000..d4d531d
--- /dev/null
+++ b/bruiser/bruiserffi.c
@@ -0,0 +1,101 @@
+
+/***************************************************Project Mutator****************************************************/
+/*first line intentionally left blank.*/
+/*bruiser's libffi side for calling xobjects*/
+/*Copyright (C) 2018 Farzad Sadeghi
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.*/
+/**********************************************************************************************************************/
+#include <ffi.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include "bruiserffi.h"
+/**********************************************************************************************************************/
+ffi_type* ffi_type_ctor(const char* arg_string) {
+  if (strcmp(arg_string, "void") == 0) {return &ffi_type_void;}
+  else if (strcmp(arg_string, "uint8") == 0) {return &ffi_type_uint8;}
+  else if (strcmp(arg_string, "sint8") == 0) {return &ffi_type_sint8;}
+  else if (strcmp(arg_string, "uint16") == 0) {return &ffi_type_uint16;}
+  else if (strcmp(arg_string, "sint16") == 0) {return &ffi_type_sint16;}
+  else if (strcmp(arg_string, "uint32") == 0) {return &ffi_type_uint32;}
+  else if (strcmp(arg_string, "sint32") == 0) {return &ffi_type_sint32;}
+  else if (strcmp(arg_string, "uint64") == 0) {return &ffi_type_uint64;}
+  else if (strcmp(arg_string, "sint64") == 0) {return &ffi_type_sint64;}
+  else if (strcmp(arg_string, "float") == 0) {return &ffi_type_float;}
+  else if (strcmp(arg_string, "double") == 0) {return &ffi_type_double;}
+  else if (strcmp(arg_string, "pointer") == 0) {return &ffi_type_pointer;}
+  // @DEVI-FIXME: currently we are not handling structs at all
+  else if (strcmp(arg_string, "struct") == 0) {return &ffi_type_pointer;}
+  else {
+    fprintf(stderr, "garbage arg type was passed.\n");
+    return NULL;
+  }
+}
+
+void* ffi_callX(int argc, const char** arg_string, ffi_type rtype, void* x_ptr, const char* ret_type) {
+  ffi_status status;
+  ffi_cif cif;
+  ffi_type* args_types[argc];
+  for (int i = 0; i < argc; ++i) {
+    if (ffi_type_ctor(arg_string[i])) args_types[i] = ffi_type_ctor(arg_string[i]);
+  }
+
+  //status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, argc, &rtype, args);
+  status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, argc, &ffi_type_uint32, args_types);
+  if (status == FFI_BAD_TYPEDEF) {
+    fprintf(stderr, "ffi_prep_cif returned FFI_BAD_TYPEDEF: %d\n", status);
+    return NULL;
+  } else if (status == FFI_BAD_ABI) {
+    fprintf(stderr, "ffi_prep_cif returned FFI_BAD_ABI: %d\n", status);
+    return NULL;
+  } else if (status == FFI_OK) {
+    fprintf(stderr, "ffi_prep_cif returned FFI_OK: %d\n", status);
+  } else {
+    fprintf(stderr, "ffi_prep_cif returned an error: %d\n", status);
+    return NULL;
+  }
+
+  uint32_t a = 30;
+  uint32_t b = 20;
+  void* ret;
+  //void* values[argc]; //FIXME the actual arguments
+  void* values[2] = {&a, &b};
+  ffi_call(&cif, FFI_FN(x_ptr), &ret, values);
+  return ret;
+}
+
+void* ffi_callX_var(int argc, const char** arg_string, ffi_type rtype, void* x_ptr, const char* ret_type) {}
+/**********************************************************************************************************************/
+// @DEVI-the following lines are only meant for testing.
+uint32_t add2(uint32_t a, uint32_t b) {return a+b;}
+uint32_t sub2(uint32_t a, uint32_t b) {return a-b;}
+int main(int argc, char** argv) {
+  void* padd = &add2;
+  void* psub = &sub2;
+  int argcount = 2;
+  ffi_type ret_type = ffi_type_uint32;
+  const char* args[] = {"uint32", "uint32"};
+  const char* ret_string = "uint32";
+
+  void* result = ffi_callX(argcount, args, ret_type, psub, ret_string);
+  fprintf(stdout, "first result %d\n", (uint32_t)result);
+  result = ffi_callX(argcount, args, ret_type, padd, ret_string);
+  fprintf(stdout, "first result %d\n", (uint32_t)result);
+  return 0;
+}
+/**********************************************************************************************************************/
+/*last line intentionally left blank.*/
+