577 lines
17 KiB
C++
577 lines
17 KiB
C++
/*
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https://github.com/peterix/dfhack
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Copyright (c) 2009-2012 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 "MemAccess.h"
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#include "Core.h"
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#include "VersionInfo.h"
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// must be last due to MS stupidity
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#include "DataDefs.h"
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#include "DataIdentity.h"
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#include "VTableInterpose.h"
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#include "Error.h"
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#include "MiscUtils.h"
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using namespace DFHack;
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void *type_identity::do_allocate_pod() {
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size_t sz = byte_size();
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void *p = malloc(sz);
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memset(p, 0, sz);
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return p;
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}
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void type_identity::do_copy_pod(void *tgt, const void *src) {
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memmove(tgt, src, byte_size());
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};
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bool type_identity::do_destroy_pod(void *obj) {
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free(obj);
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return true;
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}
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void *type_identity::allocate() {
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if (can_allocate())
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return do_allocate();
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else
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return NULL;
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}
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bool type_identity::copy(void *tgt, const void *src) {
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if (can_allocate() && tgt && src)
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return do_copy(tgt, src);
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else
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return false;
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}
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bool type_identity::destroy(void *obj) {
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if (can_allocate() && obj)
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return do_destroy(obj);
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else
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return false;
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}
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void *enum_identity::do_allocate() {
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size_t sz = byte_size();
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void *p = malloc(sz);
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memcpy(p, &first_item_value, std::min(sz, sizeof(int64_t)));
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return p;
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}
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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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compound_identity *compound_identity::list = NULL;
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std::vector<compound_identity*> compound_identity::top_scope;
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compound_identity::compound_identity(size_t size, TAllocateFn alloc,
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compound_identity *scope_parent, const char *dfhack_name)
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: constructed_identity(size, alloc), dfhack_name(dfhack_name), scope_parent(scope_parent)
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{
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next = list; list = this;
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}
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void compound_identity::doInit(Core *)
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{
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if (scope_parent)
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scope_parent->scope_children.push_back(this);
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else
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top_scope.push_back(this);
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}
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std::string compound_identity::getFullName()
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{
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if (scope_parent)
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return scope_parent->getFullName() + "." + getName();
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else
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return getName();
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}
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static std::mutex *known_mutex = NULL;
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void compound_identity::Init(Core *core)
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{
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if (!known_mutex)
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known_mutex = new std::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 (compound_identity *p = list; p; p = p->next)
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p->doInit(core);
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}
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bitfield_identity::bitfield_identity(size_t size,
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compound_identity *scope_parent, const char *dfhack_name,
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int num_bits, const bitfield_item_info *bits)
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: compound_identity(size, NULL, scope_parent, dfhack_name), bits(bits), num_bits(num_bits)
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{
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}
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enum_identity::enum_identity(size_t size,
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compound_identity *scope_parent, const char *dfhack_name,
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type_identity *base_type,
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int64_t first_item_value, int64_t last_item_value,
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const char *const *keys,
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const ComplexData *complex,
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const void *attrs, struct_identity *attr_type)
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: compound_identity(size, NULL, scope_parent, dfhack_name),
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keys(keys), complex(complex),
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first_item_value(first_item_value), last_item_value(last_item_value),
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base_type(base_type), attrs(attrs), attr_type(attr_type)
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{
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if (complex) {
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count = complex->size();
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last_item_value = complex->index_value_map.back();
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}
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else {
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count = int(last_item_value-first_item_value+1);
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}
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}
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enum_identity::enum_identity(enum_identity *base_enum, type_identity *override_base_type)
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: enum_identity(override_base_type->byte_size(), base_enum->getScopeParent(),
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base_enum->getName(), override_base_type, base_enum->first_item_value,
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base_enum->last_item_value, base_enum->keys, base_enum->complex,
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base_enum->attrs, base_enum->attr_type)
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{
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}
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enum_identity::ComplexData::ComplexData(std::initializer_list<int64_t> values)
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{
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size_t i = 0;
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for (int64_t value : values) {
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value_index_map[value] = i;
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index_value_map.push_back(value);
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i++;
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}
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}
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struct_identity::struct_identity(size_t size, TAllocateFn alloc,
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compound_identity *scope_parent, const char *dfhack_name,
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struct_identity *parent, const struct_field_info *fields)
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: compound_identity(size, alloc, scope_parent, dfhack_name),
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parent(parent), has_children(false), fields(fields)
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{
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}
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void struct_identity::doInit(Core *core)
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{
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compound_identity::doInit(core);
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if (parent) {
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parent->children.push_back(this);
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parent->has_children = true;
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}
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}
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bool struct_identity::is_subclass(struct_identity *actual)
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{
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if (!has_children && actual != this)
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return false;
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for (; actual; actual = actual->getParent())
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if (actual == this) return true;
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return false;
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}
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std::string pointer_identity::getFullName()
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{
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return (target ? target->getFullName() : std::string("void")) + "*";
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}
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std::string container_identity::getFullName(type_identity *item)
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{
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return '<' + (item ? item->getFullName() : std::string("void")) + '>';
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}
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std::string ptr_container_identity::getFullName(type_identity *item)
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{
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return '<' + (item ? item->getFullName() : std::string("void")) + std::string("*>");
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}
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std::string bit_container_identity::getFullName(type_identity *)
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{
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return "<bool>";
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}
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std::string df::buffer_container_identity::getFullName(type_identity *item)
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{
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return (item ? item->getFullName() : std::string("void")) +
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(size > 0 ? stl_sprintf("[%d]", size) : std::string("[]"));
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}
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union_identity::union_identity(size_t size, TAllocateFn alloc,
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compound_identity *scope_parent, const char *dfhack_name,
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struct_identity *parent, const struct_field_info *fields)
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: struct_identity(size, alloc, scope_parent, dfhack_name, parent, fields)
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{
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}
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virtual_identity::virtual_identity(size_t size, TAllocateFn alloc,
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const char *dfhack_name, const char *original_name,
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virtual_identity *parent, const struct_field_info *fields,
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bool is_plugin)
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: struct_identity(size, alloc, NULL, dfhack_name, parent, fields), original_name(original_name),
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vtable_ptr(NULL), is_plugin(is_plugin)
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{
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// Plugins are initialized after Init was called, so they need to be added to the name table here
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if (is_plugin)
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{
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doInit(&Core::getInstance());
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}
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}
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/* Vtable name to identity lookup. */
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static std::map<std::string, virtual_identity*> name_lookup;
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/* Vtable pointer to identity lookup. */
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std::map<void*, virtual_identity*> virtual_identity::known;
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virtual_identity::~virtual_identity()
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{
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// Remove interpose entries, so that they don't try accessing this object later
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for (auto it = interpose_list.begin(); it != interpose_list.end(); ++it)
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if (it->second)
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it->second->on_host_delete(this);
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interpose_list.clear();
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// Remove global lookup table entries if we're from a plugin
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if (is_plugin)
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{
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name_lookup.erase(getOriginalName());
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if (vtable_ptr)
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known.erase(vtable_ptr);
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}
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}
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void virtual_identity::doInit(Core *core)
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{
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struct_identity::doInit(core);
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auto vtname = getOriginalName();
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name_lookup[vtname] = this;
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vtable_ptr = core->vinfo->getVTable(vtname);
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if (vtable_ptr)
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known[vtable_ptr] = this;
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}
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virtual_identity *virtual_identity::find(const std::string &name)
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{
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auto name_it = name_lookup.find(name);
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return (name_it != name_lookup.end()) ? name_it->second : NULL;
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}
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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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return find(get_vtable(instance_ptr));
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}
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virtual_identity *virtual_identity::find(void *vtable)
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{
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if (!vtable)
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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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std::lock_guard<std::mutex> lock(*known_mutex);
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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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auto name_it = name_lookup.find(name);
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if (name_it != name_lookup.end()) {
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virtual_identity *p = name_it->second;
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if (p->vtable_ptr && p->vtable_ptr != vtable) {
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std::cerr << "Conflicting vtable ptr for class '" << p->getName()
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<< "': found 0x" << std::hex << uintptr_t(vtable)
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<< ", previous 0x" << uintptr_t(p->vtable_ptr) << std::dec << std::endl;
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abort();
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} else if (!p->vtable_ptr) {
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uintptr_t pv = uintptr_t(vtable);
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pv -= Core::getInstance().vinfo->getRebaseDelta();
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std::cerr << "<vtable-address name='" << p->getOriginalName() << "' value='0x"
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<< std::hex << pv << std::dec << "'/>" << std::endl;
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}
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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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std::cerr << "Class not in symbols.xml: '" << name << "': vtable = 0x"
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<< std::hex << uintptr_t(vtable) << std::dec << std::endl;
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known[vtable] = NULL;
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return NULL;
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}
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void virtual_identity::adjust_vtable(virtual_ptr obj, virtual_identity *main)
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{
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if (vtable_ptr) {
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*(void**)obj = vtable_ptr;
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return;
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}
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if (main && main != this && is_subclass(main))
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return;
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std::cerr << "Attempt to create class '" << getName() << "' without known vtable." << std::endl;
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throw DFHack::Error::VTableMissing(getName());
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}
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virtual_ptr virtual_identity::clone(virtual_ptr obj)
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{
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virtual_identity *id = get(obj);
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if (!id) return NULL;
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virtual_ptr copy = id->instantiate();
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if (!copy) return NULL;
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id->do_copy(copy, obj);
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return copy;
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}
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bool DFHack::findBitfieldField(unsigned *idx, const std::string &name,
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unsigned size, const bitfield_item_info *items)
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{
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for (unsigned i = 0; i < size; i++) {
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if (items[i].name && items[i].name == name)
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{
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*idx = i;
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return true;
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}
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}
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return false;
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}
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void DFHack::setBitfieldField(void *p, unsigned idx, unsigned size, int value)
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{
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uint8_t *data = ((uint8_t*)p) + (idx/8);
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unsigned shift = idx%8;
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uint32_t mask = ((1<<size)-1) << shift;
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uint32_t vmask = ((value << shift) & mask);
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#define ACCESS(type) *(type*)data = type((*(type*)data & ~mask) | vmask)
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if (!(mask & ~0xFFU)) ACCESS(uint8_t);
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else if (!(mask & ~0xFFFFU)) ACCESS(uint16_t);
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else ACCESS(uint32_t);
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#undef ACCESS
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}
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int DFHack::getBitfieldField(const void *p, unsigned idx, unsigned size)
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{
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const uint8_t *data = ((const uint8_t*)p) + (idx/8);
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unsigned shift = idx%8;
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uint32_t mask = ((1<<size)-1) << shift;
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#define ACCESS(type) return int((*(type*)data & mask) >> shift)
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if (!(mask & ~0xFFU)) ACCESS(uint8_t);
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else if (!(mask & ~0xFFFFU)) ACCESS(uint16_t);
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else ACCESS(uint32_t);
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#undef ACCESS
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}
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void DFHack::bitfieldToString(std::vector<std::string> *pvec, const void *p,
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unsigned size, const bitfield_item_info *items)
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{
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for (unsigned i = 0; i < size; i++) {
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int value = getBitfieldField(p, i, std::max(1,items[i].size));
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if (value) {
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std::string name = format_key(items[i].name, i);
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if (items[i].size > 1)
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name += stl_sprintf("=%u", value);
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pvec->push_back(name);
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}
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if (items[i].size > 1)
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i += items[i].size-1;
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}
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}
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int DFHack::findEnumItem(const std::string &name, int size, const char *const *items)
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{
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for (int i = 0; i < size; i++) {
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if (items[i] && items[i] == name)
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return i;
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}
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return -1;
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}
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void DFHack::flagarrayToString(std::vector<std::string> *pvec, const void *p,
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int bytes, int base, int size, const char *const *items)
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{
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for (int i = 0; i < bytes*8; i++) {
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int value = getBitfieldField(p, i, 1);
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if (value)
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{
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int ridx = int(i) - base;
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const char *name = (ridx >= 0 && ridx < size) ? items[ridx] : NULL;
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pvec->push_back(format_key(name, i));
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}
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}
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}
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static const struct_field_info *find_union_tag_candidate(struct_identity *structure, const struct_field_info *union_field)
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{
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if (union_field->extra && union_field->extra->union_tag_field)
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{
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auto defined_field_name = union_field->extra->union_tag_field;
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for (auto p = structure; p; p = p->getParent())
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{
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for (auto field = p->getFields(); field && field->mode != struct_field_info::END; field++)
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{
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if (!strcmp(field->name, defined_field_name))
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{
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return field;
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}
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}
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}
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return nullptr;
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}
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std::string name(union_field->name);
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if (name.length() >= 4 && name.substr(name.length() - 4) == "data")
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{
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name.erase(name.length() - 4, 4);
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name += "type";
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for (auto p = structure; p; p = p->getParent())
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{
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for (auto field = p->getFields(); field && field->mode != struct_field_info::END; field++)
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{
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if (field->name == name)
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{
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return field;
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}
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}
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}
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}
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return nullptr;
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}
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const struct_field_info *DFHack::find_union_tag(struct_identity *structure, const struct_field_info *union_field)
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{
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CHECK_NULL_POINTER(structure);
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CHECK_NULL_POINTER(union_field);
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auto tag_candidate = find_union_tag_candidate(structure, union_field);
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if (!tag_candidate)
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{
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return nullptr;
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}
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if (union_field->mode == struct_field_info::SUBSTRUCT &&
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union_field->type &&
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union_field->type->type() == IDTYPE_UNION)
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{
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// union field
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if (tag_candidate->mode == struct_field_info::PRIMITIVE &&
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tag_candidate->type &&
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tag_candidate->type->type() == IDTYPE_ENUM)
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{
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return tag_candidate;
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}
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return nullptr;
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}
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if (union_field->mode != struct_field_info::CONTAINER ||
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|
!union_field->type ||
|
|
union_field->type->type() != IDTYPE_CONTAINER)
|
|
{
|
|
// not a union field or a vector; bail
|
|
return nullptr;
|
|
}
|
|
|
|
auto container_type = static_cast<container_identity *>(union_field->type);
|
|
if (container_type->getFullName(nullptr) != "vector<void>" ||
|
|
!container_type->getItemType() ||
|
|
container_type->getItemType()->type() != IDTYPE_UNION)
|
|
{
|
|
// not a vector of unions
|
|
return nullptr;
|
|
}
|
|
|
|
if (tag_candidate->mode != struct_field_info::CONTAINER ||
|
|
!tag_candidate->type ||
|
|
tag_candidate->type->type() != IDTYPE_CONTAINER)
|
|
{
|
|
// candidate is not a vector
|
|
return nullptr;
|
|
}
|
|
|
|
auto tag_container_type = static_cast<container_identity *>(tag_candidate->type);
|
|
if (tag_container_type->getFullName(nullptr) == "vector<void>" &&
|
|
tag_container_type->getItemType() &&
|
|
tag_container_type->getItemType()->type() == IDTYPE_ENUM)
|
|
{
|
|
return tag_candidate;
|
|
}
|
|
|
|
auto union_fields = ((struct_identity*)union_field->type)->getFields();
|
|
if (tag_container_type->getFullName() == "vector<bool>" &&
|
|
union_fields[0].mode != struct_field_info::END &&
|
|
union_fields[1].mode != struct_field_info::END &&
|
|
union_fields[2].mode == struct_field_info::END)
|
|
{
|
|
return tag_candidate;
|
|
}
|
|
|
|
return nullptr;
|
|
}
|