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/*
* Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef INC_ABI_H
#define INC_ABI_H
#include "intdefs.h"
/*
* This file defines miscellaneous C++ ABI stuff. Looking at it may cause
* brain damage and/or emotional trauma.
*/
#ifdef _WIN32 // Windows RTTI stuff, obviously only used on Windows.
// MSVC RTTI is quite a black box, but thankfully there's some useful sources:
// - https://doxygen.reactos.org/d0/dcf/cxx_8h_source.html
// - https://blog.quarkslab.com/visual-c-rtti-inspection.html
// - https://www.geoffchappell.com/studies/msvc/language/predefined/
// - https://docs.rs/pelite/0.5.0/src/pelite/pe32/msvc.rs.html
// By the way, while I'm here I'd just like to point out how ridiculous this
// layout is. Whoever decided to put this many levels of indirection over what
// should be a small lookup table is an absolute nutcase. I hope that individual
// has gotten some help by now, mostly for the sake of others.
struct msvc_rtti_descriptor {
void *vtab;
void *unknown; // ???
// XXX: pretty sure this is supposed to be flexible, but too lazy to write
// the stupid union init macros to make that fully portable
char classname[80];
};
// "pointer to member displacement"
struct msvc_pmd { int mdisp, pdisp, vdisp; };
struct msvc_basedesc {
struct msvc_rtti_descriptor *desc;
uint nbases;
struct msvc_pmd where;
uint attr;
};
struct msvc_rtti_hierarchy {
uint sig;
uint attrs;
uint nbaseclasses;
struct msvc_basedesc **baseclasses;
};
struct msvc_rtti_locator {
uint sig;
int baseoff;
// ctor offset, or some flags; reactos and rust pelite say different things?
int unknown;
struct msvc_rtti_descriptor *desc;
struct msvc_rtti_hierarchy *hier;
};
// I mean seriously look at this crap!
#define DEF_MSVC_BASIC_RTTI(mod, name, vtab, typestr) \
mod struct msvc_rtti_locator name; \
static struct msvc_rtti_descriptor _desc_##name = {(vtab) + 1, 0, typestr}; \
static struct msvc_basedesc _basedesc_##name = {&_desc_##name, 0, {0, 0, 0}, 0}; \
mod struct msvc_rtti_locator name = { \
0, 0, 0, \
&_desc_##name, \
&(struct msvc_rtti_hierarchy){ \
0, 1 /* per engine */, 1, (struct msvc_basedesc *[]){&_basedesc_##name} \
} \
};
#endif
#endif
// vi: sw=4 ts=4 noet tw=80 cc=80
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