Files
clang-p2996/lldb/bindings/python/python.swig
Pavel Labath 9a14adeae0 [lldb] Remove 'extern "C"' from the lldb-swig-python interface
The LLDBSWIGPython functions had (at least) two problems:
- There wasn't a single source of truth (a header file) for the
  prototypes of these functions. This meant that subtle differences
  in copies of function declarations could go by undetected. And
  not-so-subtle differences would result in strange runtime failures.
- All of the declarations had to have an extern "C" interface, because
  the function definitions were being placed inside and extert "C" block
  generated by swig.

This patch fixes both problems by moving the function definitions to the
%header block of the swig files. This block is not surrounded by extern
"C", and seems more appropriate anyway, as swig docs say it is meant for
"user-defined support code" (whereas the previous %wrapper code was for
automatically-generated wrappers).

It also puts the declarations into the SWIGPythonBridge header file
(which seems to have been created for this purpose), and ensures it is
included by all code wishing to define or use these functions. This
means that any differences in the declaration become a compiler error
instead of a runtime failure.

Differential Revision: https://reviews.llvm.org/D114369
2021-11-30 11:06:09 +01:00

151 lines
4.8 KiB
Plaintext

/*
lldb.swig
This is the input file for SWIG, to create the appropriate C++ wrappers and
functions for various scripting languages, to enable them to call the
liblldb Script Bridge functions.
*/
/* Define our module docstring. */
%define DOCSTRING
"The lldb module contains the public APIs for Python binding.
Some of the important classes are described here:
* :py:class:`SBTarget`: Represents the target program running under the debugger.
* :py:class:`SBProcess`: Represents the process associated with the target program.
* :py:class:`SBThread`: Represents a thread of execution. :py:class:`SBProcess` contains SBThreads.
* :py:class:`SBFrame`: Represents one of the stack frames associated with a thread. :py:class:`SBThread`
contains SBFrame(s).
* :py:class:`SBSymbolContext`: A container that stores various debugger related info.
* :py:class:`SBValue`: Represents the value of a variable, a register, or an expression.
* :py:class:`SBModule`: Represents an executable image and its associated object and symbol
files. :py:class:`SBTarget` contains SBModule.
* :py:class:`SBBreakpoint`: Represents a logical breakpoint and its associated settings.
:py:class:`SBTarget` contains SBBreakpoints.
* :py:class:`SBSymbol`: Represents the symbol possibly associated with a stack frame.
* :py:class:`SBCompileUnit`: Represents a compilation unit, or compiled source file.
* :py:class:`SBFunction`: Represents a generic function, which can be inlined or not.
* :py:class:`SBBlock`: Represents a lexical block. :py:class:`SBFunction` contains SBBlocks.
* :py:class:`SBLineEntry`: Specifies an association with a contiguous range of instructions
and a source file location. :py:class:`SBCompileUnit` contains SBLineEntry.
The different enums in the `lldb` module are described in :doc:`python_api_enums`.
"
%enddef
/*
Since version 3.0.9, swig's logic for importing the native module has changed in
a way that is incompatible with our usage of the python module as __init__.py
(See swig bug #769). Fortunately, since version 3.0.11, swig provides a way for
us to override the module import logic to suit our needs. This does that.
Older swig versions will simply ignore this setting.
*/
%define MODULEIMPORT
"try:
# Try an absolute import first. If we're being loaded from lldb,
# _lldb should be a built-in module.
import $module
except ImportError:
# Relative import should work if we are being loaded by Python.
from . import $module"
%enddef
// These versions will not generate working python modules, so error out early.
#if SWIG_VERSION >= 0x030009 && SWIG_VERSION < 0x030011
#error Swig versions 3.0.9 and 3.0.10 are incompatible with lldb.
#endif
// The name of the module to be created.
%module(docstring=DOCSTRING, moduleimport=MODULEIMPORT) lldb
// Parameter types will be used in the autodoc string.
%feature("autodoc", "1");
%define ARRAYHELPER(type,name)
%inline %{
type *new_ ## name (int nitems) {
return (type *) malloc(sizeof(type)*nitems);
}
void delete_ ## name(type *t) {
free(t);
}
type name ## _get(type *t, int index) {
return t[index];
}
void name ## _set(type *t, int index, type val) {
t[index] = val;
}
%}
%enddef
%pythoncode%{
import uuid
import re
import os
import six
%}
// Include the version of swig that was used to generate this interface.
%define EMBED_VERSION(VERSION)
%pythoncode%{
# SWIG_VERSION is written as a single hex number, but the components of it are
# meant to be interpreted in decimal. So, 0x030012 is swig 3.0.12, and not
# 3.0.18.
def _to_int(hex):
return hex // 0x10 % 0x10 * 10 + hex % 0x10
swig_version = (_to_int(VERSION // 0x10000), _to_int(VERSION // 0x100), _to_int(VERSION))
del _to_int
%}
%enddef
EMBED_VERSION(SWIG_VERSION)
%pythoncode%{
# ===================================
# Iterator for lldb container objects
# ===================================
def lldb_iter(obj, getsize, getelem):
"""A generator adaptor to support iteration for lldb container objects."""
size = getattr(obj, getsize)
elem = getattr(obj, getelem)
for i in range(size()):
yield elem(i)
%}
%include <std_string.i>
%include "python-typemaps.swig"
%include "macros.swig"
%include "headers.swig"
%{
#include "../source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h"
#include "../source/Plugins/ScriptInterpreter/Python/SWIGPythonBridge.h"
#include "../bindings/python/python-swigsafecast.swig"
using namespace lldb_private;
using namespace lldb_private::python;
using namespace lldb;
%}
%include "interfaces.swig"
%include "python-extensions.swig"
%include "python-wrapper.swig"
%pythoncode%{
_initialize = True
try:
import lldbconfig
_initialize = lldbconfig.INITIALIZE
except ImportError:
pass
debugger_unique_id = 0
if _initialize:
SBDebugger.Initialize()
debugger = None
target = None
process = None
thread = None
frame = None
%}