137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/*
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https://github.com/peterix/dfhack
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Copyright (c) 2009-2011 Petr Mrázek (peterix@gmail.com)
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any
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damages arising from the use of this software.
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Permission is granted to anyone to use this software for any
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purpose, including commercial applications, and to alter it and
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redistribute it freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must
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not claim that you wrote the original software. If you use this
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software in a product, an acknowledgment in the product documentation
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would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and
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must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*/
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#include "Internal.h"
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#include <string>
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#include <vector>
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#include <map>
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#include "dfhack/Process.h"
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#include "dfhack/Core.h"
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#include "dfhack/DataDefs.h"
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#include "dfhack/VersionInfo.h"
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#include "tinythread.h"
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using namespace DFHack;
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/* The order of global object constructor calls is
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* undefined between compilation units. Therefore,
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* this list has to be plain data, so that it gets
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* initialized by the loader in the initial mmap.
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*/
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virtual_identity *virtual_identity::list = NULL;
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virtual_identity::virtual_identity(const char *dfhack_name, const char *original_name, virtual_identity *parent)
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: dfhack_name(dfhack_name), original_name(original_name), parent(parent),
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prev(NULL), vtable_ptr(NULL), has_children(true)
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{
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// Link into the static list. Nothing else can be safely done at this point.
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next = list; list = this;
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}
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/* Vtable to identity lookup. */
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static tthread::mutex *known_mutex = NULL;
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std::map<void*, virtual_identity*> virtual_identity::known;
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virtual_identity *virtual_identity::get(virtual_ptr instance_ptr)
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{
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if (!instance_ptr) return NULL;
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// Actually, a reader/writer lock would be sufficient,
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// since the table is only written once per class.
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tthread::lock_guard<tthread::mutex> lock(*known_mutex);
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void *vtable = get_vtable(instance_ptr);
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std::map<void*, virtual_identity*>::iterator it = known.find(vtable);
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if (it != known.end())
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return it->second;
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// If using a reader/writer lock, re-grab as write here, and recheck
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Core &core = Core::getInstance();
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std::string name = core.p->doReadClassName(vtable);
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virtual_identity *actual = NULL;
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for (virtual_identity *p = list; p; p = p->next) {
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if (strcmp(name.c_str(), p->getOriginalName()) != 0) continue;
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known[vtable] = p;
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p->vtable_ptr = vtable;
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return p;
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}
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known[vtable] = NULL;
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return NULL;
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}
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bool virtual_identity::check_instance(virtual_ptr instance_ptr, bool allow_subclasses)
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{
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virtual_identity *actual = get(instance_ptr);
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if (actual == this) return true;
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if (!allow_subclasses || !actual) return false;
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do {
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actual = actual->parent;
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if (actual == this) return true;
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} while (actual);
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return false;
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}
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void virtual_identity::Init()
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{
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if (!known_mutex)
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known_mutex = new tthread::mutex();
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// This cannot be done in the constructors, because
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// they are called in an undefined order.
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for (virtual_identity *p = list; p; p = p->next) {
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p->has_children = false;
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p->children.clear();
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}
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for (virtual_identity *p = list; p; p = p->next) {
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if (p->parent) {
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p->parent->children.push_back(p);
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p->parent->has_children = true;
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}
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}
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}
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#define GLOBAL(name,tname) \
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df::tname *df::global::name = NULL;
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DF_KNOWN_GLOBALS
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#undef GLOBAL
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void DFHack::InitDataDefGlobals(Core *core) {
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OffsetGroup *global_table = core->vinfo->getGroup("global");
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uint32_t tmp;
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#define GLOBAL(name,tname) \
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if (global_table->getSafeAddress(#name,tmp)) df::global::name = (df::tname*)tmp;
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DF_KNOWN_GLOBALS
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#undef GLOBAL
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}
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