rewriting check-structures-sanity to improve performance and remove the need for the lowmem option

develop
Ben Lubar 2020-03-10 18:53:56 -05:00
parent b9841110c3
commit e5de783c58
No known key found for this signature in database
GPG Key ID: 92939677AB59EDA4
8 changed files with 1010 additions and 1533 deletions

@ -6,7 +6,6 @@ include(FindThreads)
add_definitions(-DDEV_PLUGIN) add_definitions(-DDEV_PLUGIN)
dfhack_plugin(buildprobe buildprobe.cpp) dfhack_plugin(buildprobe buildprobe.cpp)
dfhack_plugin(check-structures-sanity check-structures-sanity.cpp LINK_LIBRARIES lua)
dfhack_plugin(color-dfhack-text color-dfhack-text.cpp) dfhack_plugin(color-dfhack-text color-dfhack-text.cpp)
dfhack_plugin(counters counters.cpp) dfhack_plugin(counters counters.cpp)
dfhack_plugin(dumpmats dumpmats.cpp) dfhack_plugin(dumpmats dumpmats.cpp)
@ -27,3 +26,5 @@ dfhack_plugin(zoom zoom.cpp)
if(UNIX) if(UNIX)
dfhack_plugin(ref-index ref-index.cpp) dfhack_plugin(ref-index ref-index.cpp)
endif() endif()
add_subdirectory(check-structures-sanity)

File diff suppressed because it is too large Load Diff

@ -0,0 +1,8 @@
set(PLUGIN_SRCS
dispatch.cpp
main.cpp
types.cpp
validate.cpp
)
dfhack_plugin(check-structures-sanity ${PLUGIN_SRCS} LINK_LIBRARIES lua)

@ -0,0 +1,117 @@
#pragma once
#include "Console.h"
#include "PluginManager.h"
#include "MemAccess.h"
#include "DataDefs.h"
#include "DataIdentity.h"
#include <deque>
#include <map>
#include <string>
using namespace DFHack;
#ifdef WIN32
#define UNEXPECTED __debugbreak()
#else
#define UNEXPECTED __asm__ volatile ("int $0x03")
#endif
#define PTR_ADD(ptr, offset) reinterpret_cast<const void *>(uintptr_t(ptr) + (offset))
struct QueueItem
{
QueueItem(const std::string &, const void *);
QueueItem(const QueueItem &, const std::string &, const void *);
QueueItem(const QueueItem &, size_t, const void *);
std::string path;
const void *ptr;
};
struct CheckedStructure
{
type_identity *identity;
size_t count;
CheckedStructure();
explicit CheckedStructure(type_identity *, size_t = 0);
CheckedStructure(const struct_field_info *);
size_t full_size() const;
};
namespace
{
template<typename T, bool is_pointer = std::is_pointer<T>::value>
struct safe_t
{
typedef T type;
};
template<typename T>
struct safe_t<T, true>
{
typedef void *type;
};
}
class Checker
{
color_ostream & out;
std::vector<t_memrange> mapped;
std::map<const void *, CheckedStructure> data;
std::deque<QueueItem> queue;
public:
size_t checked_count;
size_t error_count;
size_t maxerrors;
bool maxerrors_reported;
bool enums;
bool sizes;
bool unnamed;
bool failfast;
Checker(color_ostream & out);
void queue_item(const QueueItem & item, const CheckedStructure & cs);
void queue_globals();
bool process_queue();
bool is_valid_dereference(const QueueItem & item, const CheckedStructure & cs, bool quiet = false);
template<typename T>
const T validate_and_dereference(const QueueItem & item, bool quiet = false)
{
CheckedStructure cs;
cs.identity = df::identity_traits<typename safe_t<T>::type>::get();
if (!is_valid_dereference(item, cs, quiet))
return T();
return *reinterpret_cast<const T *>(item.ptr);
}
const char *get_vtable_name(const QueueItem & item, const CheckedStructure & cs, bool quiet = false);
std::pair<const void *, size_t> validate_vector_size(const QueueItem & item, const CheckedStructure & cs, bool quiet = false);
private:
color_ostream & fail(int, const QueueItem &, const CheckedStructure &);
void dispatch_item(const QueueItem &, const CheckedStructure &);
void dispatch_single_item(const QueueItem &, const CheckedStructure &);
void dispatch_primitive(const QueueItem &, const CheckedStructure &);
void dispatch_pointer(const QueueItem &, const CheckedStructure &);
void dispatch_container(const QueueItem &, const CheckedStructure &);
void dispatch_ptr_container(const QueueItem &, const CheckedStructure &);
void dispatch_bit_container(const QueueItem &, const CheckedStructure &);
void dispatch_bitfield(const QueueItem &, const CheckedStructure &);
void dispatch_enum(const QueueItem &, const CheckedStructure &);
void dispatch_struct(const QueueItem &, const CheckedStructure &);
void dispatch_field(const QueueItem &, const CheckedStructure &, const struct_field_info *, const struct_field_info *);
void dispatch_class(const QueueItem &, const CheckedStructure &);
void dispatch_buffer(const QueueItem &, const CheckedStructure &);
void dispatch_stl_ptr_vector(const QueueItem &, const CheckedStructure &);
void dispatch_untagged_union(const QueueItem &, const CheckedStructure &);
void check_stl_vector(const QueueItem &, type_identity *);
friend struct CheckedStructure;
static type_identity *wrap_in_pointer(type_identity *);
static type_identity *wrap_in_stl_ptr_vector(type_identity *);
};
#define FAIL(message) (static_cast<color_ostream &>(fail(__LINE__, item, cs) << message) << COLOR_RESET << std::endl)

@ -0,0 +1,389 @@
#include "check-structures-sanity.h"
#include "df/large_integer.h"
Checker::Checker(color_ostream & out) :
out(out),
checked_count(0),
error_count(0),
maxerrors(~size_t(0)),
maxerrors_reported(false),
enums(false),
sizes(false),
unnamed(false),
failfast(false)
{
Core::getInstance().p->getMemRanges(mapped);
}
color_ostream & Checker::fail(int line, const QueueItem & item, const CheckedStructure & cs)
{
error_count++;
out << COLOR_LIGHTRED << "sanity check failed (line " << line << "): ";
out << COLOR_RESET << (cs.identity ? cs.identity->getFullName() : "?");
out << " (accessed as " << item.path << "): ";
out << COLOR_YELLOW;
if (maxerrors && maxerrors != ~size_t(0))
maxerrors--;
if (failfast)
UNEXPECTED;
return out;
}
void Checker::queue_item(const QueueItem & item, const CheckedStructure & cs)
{
if (data.count(item.ptr) && data.at(item.ptr).full_size() == cs.full_size())
{
// already checked
// TODO: make sure types are equal
UNEXPECTED;
return;
}
auto ptr_end = PTR_ADD(item.ptr, cs.full_size());
auto prev = data.lower_bound(item.ptr);
if (prev != data.cbegin())
{
prev--;
if (uintptr_t(prev->first) + prev->second.full_size() > uintptr_t(item.ptr))
{
// TODO
UNEXPECTED;
}
}
auto overlap = data.lower_bound(item.ptr);
auto overlap_end = data.lower_bound(ptr_end);
while (overlap != overlap_end)
{
// TODO
UNEXPECTED;
overlap++;
}
data[item.ptr] = cs;
queue.push_back(item);
}
void Checker::queue_globals()
{
auto fields = df::global::_identity.getFields();
for (auto field = fields; field->mode != struct_field_info::END; field++)
{
if (!field->offset)
{
UNEXPECTED;
continue;
}
// offset is the position of the DFHack pointer to this global.
auto ptr = *reinterpret_cast<const void **>(field->offset);
QueueItem item(stl_sprintf("df.global.%s", field->name), ptr);
CheckedStructure cs(field);
if (!ptr)
{
FAIL("unknown global address");
continue;
}
queue_item(item, cs);
}
}
bool Checker::process_queue()
{
if (queue.empty())
{
return false;
}
auto item = std::move(queue.front());
queue.pop_front();
auto cs = data.find(item.ptr);
if (cs == data.end())
{
// happens if pointer is determined to be part of a larger structure
return true;
}
dispatch_item(item, cs->second);
return true;
}
void Checker::dispatch_item(const QueueItem & base, const CheckedStructure & cs)
{
if (!is_valid_dereference(base, cs))
{
return;
}
if (!cs.count)
{
dispatch_single_item(base, cs);
return;
}
auto ptr = base.ptr;
auto size = cs.identity->byte_size();
for (size_t i = 0; i < cs.count; i++)
{
QueueItem item(base, i, ptr);
dispatch_single_item(item, cs);
ptr = PTR_ADD(ptr, size);
}
}
void Checker::dispatch_single_item(const QueueItem & item, const CheckedStructure & cs)
{
checked_count++;
if (!maxerrors)
{
if (!maxerrors_reported)
{
FAIL("error limit reached. bailing out with " << (queue.size() + 1) << " items remaining in the queue.");
maxerrors_reported = true;
}
queue.clear();
return;
}
switch (cs.identity->type())
{
case IDTYPE_GLOBAL:
case IDTYPE_FUNCTION:
UNEXPECTED;
break;
case IDTYPE_PRIMITIVE:
dispatch_primitive(item, cs);
break;
case IDTYPE_POINTER:
dispatch_pointer(item, cs);
break;
case IDTYPE_CONTAINER:
dispatch_container(item, cs);
break;
case IDTYPE_PTR_CONTAINER:
dispatch_ptr_container(item, cs);
break;
case IDTYPE_BIT_CONTAINER:
dispatch_bit_container(item, cs);
break;
case IDTYPE_BITFIELD:
dispatch_bitfield(item, cs);
break;
case IDTYPE_ENUM:
dispatch_enum(item, cs);
break;
case IDTYPE_STRUCT:
dispatch_struct(item, cs);
break;
case IDTYPE_CLASS:
dispatch_class(item, cs);
break;
case IDTYPE_BUFFER:
dispatch_buffer(item, cs);
break;
case IDTYPE_STL_PTR_VECTOR:
dispatch_stl_ptr_vector(item, cs);
break;
case IDTYPE_OPAQUE:
UNEXPECTED;
break;
case IDTYPE_UNION:
dispatch_untagged_union(item, cs);
break;
}
}
void Checker::dispatch_primitive(const QueueItem & item, const CheckedStructure & cs)
{
if (cs.identity->isConstructed())
{
if (cs.identity == df::identity_traits<std::string>::get())
{
// TODO check std::string
UNEXPECTED;
}
else
{
UNEXPECTED;
}
}
// TODO: check primitives
UNEXPECTED;
}
void Checker::dispatch_pointer(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<pointer_identity *>(cs.identity);
// TODO: check pointer
UNEXPECTED;
}
void Checker::dispatch_container(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<container_identity *>(cs.identity);
auto base_container = identity->getFullName(nullptr);
if (base_container == "vector<void>")
{
if (identity->getIndexEnumType())
{
UNEXPECTED;
}
check_stl_vector(item, identity->getItemType());
}
else if (base_container == "deque<void>")
{
// TODO: check deque?
}
else
{
UNEXPECTED;
}
}
void Checker::dispatch_ptr_container(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<container_identity *>(cs.identity);
auto base_container = identity->getFullName(nullptr);
{
UNEXPECTED;
}
}
void Checker::dispatch_bit_container(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<container_identity *>(cs.identity);
auto base_container = identity->getFullName(nullptr);
if (base_container == "BitArray<>")
{
// TODO: check DF bit array
UNEXPECTED;
}
else if (base_container == "vector<bool>")
{
// TODO: check stl bit vector
UNEXPECTED;
}
else
{
UNEXPECTED;
}
}
void Checker::dispatch_bitfield(const QueueItem & item, const CheckedStructure & cs)
{
if (!enums)
{
return;
}
// TODO: check bitfields
UNEXPECTED;
}
void Checker::dispatch_enum(const QueueItem & item, const CheckedStructure & cs)
{
if (!enums)
{
return;
}
// TODO: check enums
UNEXPECTED;
}
void Checker::dispatch_struct(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<struct_identity *>(cs.identity);
for (auto p = identity; p; p = p->getParent())
{
auto fields = p->getFields();
for (auto field = fields; field->mode != struct_field_info::END; field++)
{
dispatch_field(item, cs, fields, field);
}
}
}
void Checker::dispatch_field(const QueueItem & item, const CheckedStructure & cs, const struct_field_info *fields, const struct_field_info *field)
{
if (field->mode == struct_field_info::OBJ_METHOD ||
field->mode == struct_field_info::CLASS_METHOD)
{
return;
}
auto tag_field = find_union_tag(fields, field);
if (tag_field)
{
UNEXPECTED;
return;
}
auto field_ptr = PTR_ADD(item.ptr, field->offset);
CheckedStructure field_cs(field);
dispatch_item(QueueItem(item, field->name, field_ptr), field_cs);
}
void Checker::dispatch_class(const QueueItem & item, const CheckedStructure & cs)
{
auto vtable_name = get_vtable_name(item, cs);
if (!vtable_name)
{
// bail out now because virtual_identity::get will crash
return;
}
auto base_identity = static_cast<virtual_identity *>(cs.identity);
auto vptr = static_cast<virtual_ptr>(const_cast<void *>(item.ptr));
if (!base_identity->is_instance(vptr))
{
FAIL("expected subclass of " << base_identity->getFullName() << ", but got " << vtable_name);
return;
}
auto identity = virtual_identity::get(vptr);
dispatch_struct(QueueItem(item.path + "<" + identity->getFullName() + ">", item.ptr), CheckedStructure(identity));
}
void Checker::dispatch_buffer(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<container_identity *>(cs.identity);
if (identity->getIndexEnumType())
{
UNEXPECTED;
}
auto item_identity = identity->getItemType();
dispatch_item(item, CheckedStructure(item_identity, identity->byte_size() / item_identity->byte_size()));
}
void Checker::dispatch_stl_ptr_vector(const QueueItem & item, const CheckedStructure & cs)
{
auto identity = static_cast<container_identity *>(cs.identity);
if (identity->getIndexEnumType())
{
UNEXPECTED;
}
auto ptr_type = wrap_in_pointer(identity->getItemType());
check_stl_vector(item, ptr_type);
}
void Checker::dispatch_untagged_union(const QueueItem & item, const CheckedStructure & cs)
{
if (cs.identity == df::identity_traits<df::large_integer>::get())
{
dispatch_primitive(item, CheckedStructure(df::identity_traits<int64_t>::get()));
return;
}
UNEXPECTED;
}
void Checker::check_stl_vector(const QueueItem & item, type_identity *item_identity)
{
auto vec_items = validate_vector_size(item, CheckedStructure(item_identity));
if (vec_items.first && vec_items.second)
{
QueueItem items_item(item.path, vec_items.first);
CheckedStructure items_cs(item_identity, vec_items.second);
queue_item(items_item, items_cs);
}
}

@ -0,0 +1,126 @@
#include "check-structures-sanity.h"
#include "LuaTools.h"
#include "LuaWrapper.h"
DFHACK_PLUGIN("check-structures-sanity");
static command_result command(color_ostream &, std::vector<std::string> &);
DFhackCExport command_result plugin_init(color_ostream &, std::vector<PluginCommand> & commands)
{
commands.push_back(PluginCommand(
"check-structures-sanity",
"performs a sanity check on df-structures",
command,
false,
"check-structures-sanity [-enums] [-sizes] [-lowmem] [-maxerrors n] [-failfast] [starting_point]\n"
"\n"
"-enums: report unexpected or unnamed enum or bitfield values.\n"
"-sizes: report struct and class sizes that don't match structures. (requires sizecheck)\n"
"-unnamed: report unnamed enum/bitfield values, not just undefined ones.\n"
"-maxerrors n: set the maximum number of errors before bailing out.\n"
"-failfast: crash if any error is encountered. useful only for debugging.\n"
"starting_point: a lua expression or a word like 'screen', 'item', or 'building'. (defaults to df.global)\n"
"\n"
"by default, check-structures-sanity reports invalid pointers, vectors, strings, and vtables."
));
return CR_OK;
}
static command_result command(color_ostream & out, std::vector<std::string> & parameters)
{
CoreSuspender suspend;
Checker checker(out);
// check parameters with values first
#define VAL_PARAM(name, expr_using_value) \
auto name ## _idx = std::find(parameters.begin(), parameters.end(), "-" #name); \
if (name ## _idx != parameters.end()) \
{ \
if (name ## _idx + 1 == parameters.end()) \
{ \
return CR_WRONG_USAGE; \
} \
try \
{ \
auto value = std::move(*(name ## _idx + 1)); \
parameters.erase((name ## _idx + 1)); \
parameters.erase(name ## _idx); \
checker.name = (expr_using_value); \
} \
catch (std::exception & ex) \
{ \
out.printerr("check-structures-sanity: argument to -%s: %s\n", #name, ex.what()); \
return CR_WRONG_USAGE; \
} \
}
VAL_PARAM(maxerrors, std::stoul(value));
#undef VAL_PARAM
#define BOOL_PARAM(name) \
auto name ## _idx = std::find(parameters.begin(), parameters.end(), "-" #name); \
if (name ## _idx != parameters.end()) \
{ \
checker.name = true; \
parameters.erase(name ## _idx); \
}
BOOL_PARAM(enums);
BOOL_PARAM(sizes);
BOOL_PARAM(unnamed);
BOOL_PARAM(failfast);
#undef BOOL_PARAM
if (parameters.size() > 1)
{
return CR_WRONG_USAGE;
}
if (parameters.empty())
{
checker.queue_globals();
}
else
{
using namespace DFHack::Lua;
using namespace DFHack::Lua::Core;
using namespace DFHack::LuaWrapper;
StackUnwinder unwinder(State);
PushModulePublic(out, "utils", "df_expr_to_ref");
Push(parameters.at(0));
if (!SafeCall(out, 1, 1))
{
return CR_FAILURE;
}
if (!lua_touserdata(State, -1))
{
return CR_WRONG_USAGE;
}
QueueItem item(parameters.at(0), get_object_ref(State, -1));
lua_getfield(State, -1, "_type");
lua_getfield(State, -1, "_identity");
auto identity = reinterpret_cast<type_identity *>(lua_touserdata(State, -1));
if (!identity)
{
out.printerr("could not determine type identity\n");
return CR_FAILURE;
}
checker.queue_item(item, CheckedStructure(identity));
}
while (checker.process_queue())
{
if (out.is_console())
{
out << "checked " << checker.checked_count << " fields\r" << std::flush;
}
}
out << "checked " << checker.checked_count << " fields" << std::endl;
return checker.error_count ? CR_FAILURE : CR_OK;
}

@ -0,0 +1,131 @@
#include "check-structures-sanity.h"
QueueItem::QueueItem(const std::string & path, const void *ptr) :
path(path),
ptr(ptr)
{
}
QueueItem::QueueItem(const QueueItem & parent, const std::string & member, const void *ptr) :
QueueItem(parent.path + "." + member, ptr)
{
}
QueueItem::QueueItem(const QueueItem & parent, size_t index, const void *ptr) :
QueueItem(parent.path + stl_sprintf("[%zu]", index), ptr)
{
}
CheckedStructure::CheckedStructure() :
CheckedStructure(nullptr, 0)
{
}
CheckedStructure::CheckedStructure(type_identity *identity, size_t count) :
identity(identity),
count(count)
{
}
CheckedStructure::CheckedStructure(const struct_field_info *field) :
CheckedStructure()
{
if (!field || field->mode == struct_field_info::END)
{
UNEXPECTED;
}
if (field->mode == struct_field_info::STATIC_ARRAY && field->eid)
{
UNEXPECTED;
}
else if (field->type && field->type->isContainer())
{
auto expected_eid = static_cast<container_identity *>(field->type)->getIndexEnumType();
if (field->eid != expected_eid)
{
UNEXPECTED;
}
}
else if (field->eid)
{
UNEXPECTED;
}
identity = field->type;
switch (field->mode)
{
case struct_field_info::END:
UNEXPECTED;
break;
case struct_field_info::PRIMITIVE:
if (field->count || !field->type)
{
UNEXPECTED;
}
break;
case struct_field_info::STATIC_STRING:
if (!field->count || field->type)
{
UNEXPECTED;
}
identity = df::identity_traits<char>::get();
count = field->count;
break;
case struct_field_info::POINTER:
// TODO: check flags (stored in field->count)
identity = Checker::wrap_in_pointer(field->type);
break;
case struct_field_info::STATIC_ARRAY:
if (!field->count || !field->type)
{
UNEXPECTED;
}
count = field->count;
break;
case struct_field_info::SUBSTRUCT:
case struct_field_info::CONTAINER:
if (field->count || !field->type)
{
UNEXPECTED;
}
break;
case struct_field_info::STL_VECTOR_PTR:
if (field->count)
{
UNEXPECTED;
}
identity = Checker::wrap_in_stl_ptr_vector(field->type);
break;
case struct_field_info::OBJ_METHOD:
case struct_field_info::CLASS_METHOD:
UNEXPECTED;
break;
}
}
size_t CheckedStructure::full_size() const
{
size_t size = identity->byte_size();
if (count)
{
size *= count;
}
return size;
}
#define RETURN_CACHED_WRAPPER(T, base, ...) \
static std::map<type_identity *, std::unique_ptr<T>> wrappers; \
auto it = wrappers.find(base); \
if (it != wrappers.end()) \
{ \
return it->second.get(); \
} \
return (wrappers[base] = dts::make_unique<T>(base __VA_OPT__(,) __VA_ARGS__)).get()
type_identity *Checker::wrap_in_stl_ptr_vector(type_identity *base)
{
RETURN_CACHED_WRAPPER(df::stl_ptr_vector_identity, base, nullptr);
}
type_identity *Checker::wrap_in_pointer(type_identity *base)
{
RETURN_CACHED_WRAPPER(df::pointer_identity, base);
}

@ -0,0 +1,237 @@
#include "check-structures-sanity.h"
bool Checker::is_valid_dereference(const QueueItem & item, const CheckedStructure & cs, bool quiet)
{
auto base = const_cast<void *>(item.ptr);
auto size = cs.full_size();
if (!base)
{
// cannot dereference null pointer, but not an error
return false;
}
// assumes MALLOC_PERTURB_=45
#ifdef DFHACK64
#define UNINIT_PTR 0xd2d2d2d2d2d2d2d2
#define FAIL_PTR(message) FAIL(stl_sprintf("0x%016zx: ", reinterpret_cast<uintptr_t>(base)) << message)
#else
#define UNINIT_PTR 0xd2d2d2d2
#define FAIL_PTR(message) FAIL(stl_sprintf("0x%08zx: ", reinterpret_cast<uintptr_t>(base)) << message)
#endif
if (uintptr_t(base) == UNINIT_PTR)
{
if (!quiet)
{
FAIL_PTR("uninitialized pointer");
}
return false;
}
bool found = true;
auto expected_start = base;
size_t remaining_size = size;
while (found)
{
found = false;
for (auto & range : mapped)
{
if (!range.isInRange(expected_start))
{
continue;
}
found = true;
if (!range.valid || !range.read)
{
if (!quiet)
{
FAIL_PTR("pointer to invalid memory range");
}
return false;
}
auto expected_end = const_cast<void *>(PTR_ADD(expected_start, remaining_size - 1));
if (size && !range.isInRange(expected_end))
{
auto next_start = PTR_ADD(range.end, 1);
remaining_size -= ptrdiff_t(next_start) - ptrdiff_t(expected_start);
expected_start = const_cast<void *>(next_start);
break;
}
return true;
}
}
if (quiet)
{
return false;
}
if (expected_start == base)
{
FAIL_PTR("pointer not in any mapped range");
}
else
{
FAIL_PTR("pointer exceeds mapped memory bounds (size " << size << ")");
}
return false;
#undef FAIL_PTR
}
const char *Checker::get_vtable_name(const QueueItem & item, const CheckedStructure & cs, bool quiet)
{
auto vtable = validate_and_dereference<const void *const*>(QueueItem(item, "?vtable?", item.ptr), quiet);
if (!vtable)
return nullptr;
auto info = validate_and_dereference<const char *const*>(QueueItem(item, "?vtable?.info", vtable - 1), quiet);
if (!info)
return nullptr;
#ifdef WIN32
#ifdef DFHACK64
void *base;
if (!RtlPcToFileHeader(info, &base))
return nullptr;
const char *typeinfo = reinterpret_cast<const char *>(base) + reinterpret_cast<int32_t *>(info)[3];
const char *name = typeinfo + 16;
#else
const char *name = reinterpret_cast<const char *>(info) + 8;
#endif
#else
auto name = validate_and_dereference<const char *>(QueueItem(item, "?vtable?.info.name", info + 1), quiet);
#endif
for (auto & range : mapped)
{
if (!range.isInRange(const_cast<char *>(name)))
{
continue;
}
if (!range.valid || !range.read)
{
if (!quiet)
{
FAIL("pointer to invalid memory range");
}
return nullptr;
}
const char *first_letter = nullptr;
bool letter = false;
for (const char *p = name; ; p++)
{
if (!range.isInRange(const_cast<char *>(p)))
{
return nullptr;
}
if ((*p >= 'a' && *p <= 'z') || *p == '_')
{
if (!letter)
{
first_letter = p;
}
letter = true;
}
else if (!*p)
{
return first_letter;
}
}
}
return nullptr;
}
std::pair<const void *, size_t> Checker::validate_vector_size(const QueueItem & item, const CheckedStructure & cs, bool quiet)
{
struct vector_data
{
uintptr_t start;
uintptr_t finish;
uintptr_t end_of_storage;
};
vector_data vector = *reinterpret_cast<const vector_data *>(item.ptr);
ptrdiff_t length = vector.finish - vector.start;
ptrdiff_t capacity = vector.end_of_storage - vector.start;
bool local_ok = true;
auto item_size = cs.full_size();
if (!item_size)
{
item_size = 1;
local_ok = false;
}
if (vector.start > vector.finish)
{
local_ok = false;
if (!quiet)
{
FAIL("vector length is negative (" << (length / ptrdiff_t(item_size)) << ")");
}
}
if (vector.start > vector.end_of_storage)
{
local_ok = false;
if (!quiet)
{
FAIL("vector capacity is negative (" << (capacity / ptrdiff_t(item_size)) << ")");
}
}
else if (vector.finish > vector.end_of_storage)
{
local_ok = false;
if (!quiet)
{
FAIL("vector capacity (" << (capacity / ptrdiff_t(item_size)) << ") is less than its length (" << (length / ptrdiff_t(item_size)) << ")");
}
}
size_t ulength = size_t(length);
size_t ucapacity = size_t(capacity);
if (ulength % item_size != 0)
{
local_ok = false;
if (!quiet)
{
FAIL("vector length is non-integer (" << (ulength / item_size) << " items plus " << (ulength % item_size) << " bytes)");
}
}
if (ucapacity % item_size != 0)
{
local_ok = false;
if (!quiet)
{
FAIL("vector capacity is non-integer (" << (ucapacity / item_size) << " items plus " << (ucapacity % item_size) << " bytes)");
}
}
if (local_ok && capacity && !vector.start)
{
if (!quiet)
{
FAIL("vector has null pointer but capacity " << (capacity / item_size));
}
return std::make_pair(nullptr, 0);
}
auto start_ptr = reinterpret_cast<const void *>(vector.start);
if (capacity && !is_valid_dereference(QueueItem(item, "?items?", start_ptr), CheckedStructure(cs.identity, capacity / item_size), quiet))
{
local_ok = false;
}
return local_ok ? std::make_pair(start_ptr, ulength / item_size) : std::make_pair(nullptr, 0);
}