new api class: SBFile

Summary:
SBFile is a scripting API wrapper for lldb_private::File

This is the first step in a project to enable arbitrary python
io.IOBase file objects -- including those that override the read()
and write() methods -- to be used as the main debugger IOStreams.

Currently this is impossible because python file objects must first
be converted into FILE* streams by SWIG in order to be passed into
the debugger.

full prototype: https://github.com/smoofra/llvm-project/tree/files

Reviewers: JDevlieghere, jasonmolenda, zturner, jingham, labath

Reviewed By: labath

Subscribers: labath, mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D67793

llvm-svn: 373562

1 files changed, 42 insertions, 1 deletions

diff --git a/lldb/scripts/Python/python-typemaps.swig b/lldb/scripts/Python/python-typemaps.swig
index fe6a1798c53..9c43ef18ac1 100644
--- a/lldb/scripts/Python/python-typemaps.swig
+++ b/lldb/scripts/Python/python-typemaps.swig
@@ -224,7 +224,7 @@
 namespace {
 template <class T>
 T PyLongAsT(PyObject *obj) {
-  static_assert(true, "unsupported type"); 
+  static_assert(true, "unsupported type");
 }
 
 template <> uint64_t PyLongAsT<uint64_t>(PyObject *obj) {
@@ -461,3 +461,44 @@ bool SetNumberFromPyObject<double>(double &number, PyObject *obj) {
         return NULL;
     }
 }
+
+// These two pybuffer macros are copied out of swig/Lib/python/pybuffer.i,
+// and fixed so they will not crash if PyObject_GetBuffer fails.
+// https://github.com/swig/swig/issues/1640
+
+%define %pybuffer_mutable_binary(TYPEMAP, SIZE)
+%typemap(in) (TYPEMAP, SIZE) {
+  int res; Py_ssize_t size = 0; void *buf = 0;
+  Py_buffer view;
+  res = PyObject_GetBuffer($input, &view, PyBUF_WRITABLE);
+  if (res < 0) {
+    PyErr_Clear();
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  size = view.len;
+  buf = view.buf;
+  PyBuffer_Release(&view);
+  $1 = ($1_ltype) buf;
+  $2 = ($2_ltype) (size/sizeof($*1_type));
+}
+%enddef
+
+%define %pybuffer_binary(TYPEMAP, SIZE)
+%typemap(in) (TYPEMAP, SIZE) {
+  int res; Py_ssize_t size = 0; const void *buf = 0;
+  Py_buffer view;
+  res = PyObject_GetBuffer($input, &view, PyBUF_CONTIG_RO);
+  if (res < 0) {
+    PyErr_Clear();
+    %argument_fail(res, "(TYPEMAP, SIZE)", $symname, $argnum);
+  }
+  size = view.len;
+  buf = view.buf;
+  PyBuffer_Release(&view);
+  $1 = ($1_ltype) buf;
+  $2 = ($2_ltype) (size / sizeof($*1_type));
+}
+%enddef
+
+%pybuffer_binary(const uint8_t *buf, size_t num_bytes);
+%pybuffer_mutable_binary(uint8_t *buf, size_t num_bytes);