542 lines
13 KiB
C++
542 lines
13 KiB
C++
#include "Console.h"
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#include "PluginManager.h"
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#include "MemAccess.h"
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#include "DataDefs.h"
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#include "DataIdentity.h"
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#include <set>
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#include <typeinfo>
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using namespace DFHack;
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DFHACK_PLUGIN("check-structures-sanity");
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static command_result command(color_ostream &, std::vector<std::string> &);
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#ifdef WIN32
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#define UNEXPECTED __debugbreak()
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#else
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#define UNEXPECTED __asm__ volatile ("int $0x03")
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#endif
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DFhackCExport command_result plugin_init(color_ostream & out, std::vector<PluginCommand> & commands)
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{
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commands.push_back(PluginCommand(
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"check-structures-sanity",
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"performs a sanity check on df-structures",
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command,
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false,
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"checks structures to make sure vectors aren't misidentified"
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));
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return CR_OK;
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}
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class Checker
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{
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color_ostream & out;
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std::vector<t_memrange> mapped;
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std::set<void *> seen_addr;
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std::vector<std::string> path;
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bool ok;
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bool check_access(void *, type_identity *);
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void *safe_dereference(void *, ptrdiff_t = 0);
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void check_global(global_identity *);
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void check_fields(void *, const struct_field_info *);
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void check_field(void *, const struct_field_info *);
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void check_item(void *, type_identity *);
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void check_pointer(void *, type_identity *);
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void check_static_array(void *, type_identity *, size_t);
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void check_container(void *, container_identity *);
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void check_vector(void *, container_identity *, type_identity *);
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void check_deque(void *, container_identity *, type_identity *);
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void check_bit_container(void *, container_identity *);
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void check_virtual(void *, virtual_identity *);
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class Scope
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{
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Checker *parent;
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public:
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Scope(Checker *, const std::string &);
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Scope(Checker *, size_t);
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Scope(const Scope &) = delete;
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~Scope();
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};
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public:
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Checker(color_ostream &);
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bool check();
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};
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static command_result command(color_ostream & out, std::vector<std::string> & parameters)
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{
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if (!parameters.empty())
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{
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return CR_WRONG_USAGE;
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}
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CoreSuspender suspend;
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Checker checker(out);
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return checker.check() ? CR_OK : CR_FAILURE;
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}
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Checker::Checker(color_ostream & out) :
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out(out)
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{
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Core::getInstance().p->getMemRanges(mapped);
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}
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bool Checker::check()
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{
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seen_addr.clear();
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ok = true;
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check_global(&df::global::_identity);
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return ok;
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}
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Checker::Scope::Scope(Checker *parent, const std::string & name) :
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parent(parent)
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{
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parent->path.push_back(name);
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}
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Checker::Scope::Scope(Checker *parent, size_t index) :
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Scope(parent, stl_sprintf("[%lu]", index))
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{
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}
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Checker::Scope::~Scope()
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{
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parent->path.pop_back();
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}
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#define FAIL(message) \
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do \
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{ \
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ok = false; \
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out << COLOR_LIGHTRED << "sanity check failed (line " << __LINE__ << "): "; \
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out << COLOR_RESET << (identity ? identity->getFullName() : "?") << " (accessed as "; \
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for (auto & p : path) { out << p; } \
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out << "): "; \
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out << COLOR_YELLOW << message; \
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out << COLOR_RESET << std::endl; \
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} while (false)
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#define PTR_ADD(base, offset) (reinterpret_cast<void *>(reinterpret_cast<uintptr_t>((base)) + static_cast<ptrdiff_t>((offset))))
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bool Checker::check_access(void *base, type_identity *identity)
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{
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if (!base)
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{
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// null pointer: can't access, but not an error
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return false;
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}
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for (auto & range : mapped)
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{
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if (!range.isInRange(base))
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{
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continue;
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}
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if (!range.valid || !range.read)
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{
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FAIL("pointer to invalid memory range");
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return false;
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}
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if (identity && !range.isInRange(PTR_ADD(base, identity->byte_size())))
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{
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FAIL("pointer exceeds mapped memory bounds");
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return false;
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}
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return true;
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}
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FAIL("pointer not in any mapped range");
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return false;
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}
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void *Checker::safe_dereference(void *base, ptrdiff_t offset)
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{
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if (!base)
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{
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return nullptr;
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}
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type_identity *identity = nullptr; // void
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for (auto & range : mapped)
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{
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if (!range.isInRange(base))
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{
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continue;
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}
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if (!range.valid || !range.read)
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{
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return nullptr;
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}
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if (!range.isInRange(PTR_ADD(base, offset)))
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{
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return nullptr;
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}
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return *reinterpret_cast<void **>(PTR_ADD(base, offset));
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}
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return nullptr;
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}
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void Checker::check_global(global_identity *identity)
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{
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Scope scope(this, "df::global::");
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for (auto field = identity->getFields(); field->mode != struct_field_info::END; field++)
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{
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if (!field->offset)
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{
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Scope scope_2(this, field->name);
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FAIL("global address is unknown");
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continue;
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}
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auto base = reinterpret_cast<void **>(field->offset);
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if (!seen_addr.insert(base).second)
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{
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continue;
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}
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check_field(*base, field);
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}
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}
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void Checker::check_fields(void *base, const struct_field_info *fields)
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{
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for (auto field = fields; field->mode != struct_field_info::END; field++)
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{
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check_field(PTR_ADD(base, field->offset), field);
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}
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}
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void Checker::check_field(void *base, const struct_field_info *field)
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{
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Scope scope(this, field->name);
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switch (field->mode)
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{
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case struct_field_info::END:
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// can't happen - already checked
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break;
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case struct_field_info::PRIMITIVE:
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// don't need to check primitives
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break;
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case struct_field_info::STATIC_STRING:
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// TODO: check static strings?
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break;
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case struct_field_info::POINTER:
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check_pointer(base, field->type);
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break;
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case struct_field_info::STATIC_ARRAY:
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check_static_array(base, field->type, field->count);
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break;
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case struct_field_info::SUBSTRUCT:
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check_item(base, field->type);
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break;
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case struct_field_info::CONTAINER:
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check_container(base, static_cast<container_identity *>(field->type));
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break;
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case struct_field_info::STL_VECTOR_PTR:
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{
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df::stl_ptr_vector_identity temp_identity(field->type, field->eid);
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check_container(base, &temp_identity);
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}
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break;
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case struct_field_info::OBJ_METHOD:
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// ignore
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break;
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case struct_field_info::CLASS_METHOD:
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// ignore
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break;
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}
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}
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void Checker::check_item(void *base, type_identity *identity)
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{
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if (!identity)
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{
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// void
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return;
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}
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switch (identity->type())
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{
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case IDTYPE_GLOBAL:
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// impossible
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break;
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case IDTYPE_FUNCTION:
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// ignore
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break;
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case IDTYPE_PRIMITIVE:
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// don't need to check primitives
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break;
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case IDTYPE_POINTER:
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check_pointer(base, static_cast<pointer_identity *>(identity)->getTarget());
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break;
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case IDTYPE_CONTAINER:
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case IDTYPE_BIT_CONTAINER:
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case IDTYPE_PTR_CONTAINER:
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case IDTYPE_STL_PTR_VECTOR:
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check_container(base, static_cast<container_identity *>(identity));
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break;
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case IDTYPE_BITFIELD:
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// TODO: check bitfields?
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break;
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case IDTYPE_ENUM:
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// TODO: check enums?
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break;
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case IDTYPE_STRUCT:
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{
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Scope scope(this, ".");
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check_fields(base, static_cast<struct_identity *>(identity)->getFields());
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}
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break;
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case IDTYPE_CLASS:
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check_virtual(base, static_cast<virtual_identity *>(identity));
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break;
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case IDTYPE_BUFFER:
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{
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auto item_identity = static_cast<container_identity *>(identity)->getItemType();
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check_static_array(base, item_identity, identity->byte_size() / item_identity->byte_size());
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}
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break;
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case IDTYPE_OPAQUE:
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// can't check opaque types
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break;
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}
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}
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void Checker::check_pointer(void *base, type_identity *identity)
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{
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if (!seen_addr.insert(base).second)
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{
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return;
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}
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if (!identity)
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{
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// void pointer
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return;
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}
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auto ptr = *reinterpret_cast<void **>(base);
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if (!check_access(ptr, identity))
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{
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return;
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}
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check_item(ptr, identity);
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}
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void Checker::check_static_array(void *base, type_identity *identity, size_t count)
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{
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if (identity->isPrimitive())
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{
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return;
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}
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size_t item_size = identity->byte_size();
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for (size_t i = 0; i < count; i++)
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{
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Scope scope(this, i);
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check_item(PTR_ADD(base, item_size * i), identity);
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}
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}
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void Checker::check_container(void *base, container_identity *identity)
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{
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if (identity->type() == IDTYPE_STRUCT)
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{
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// DfLinkedList
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check_item(base, identity);
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return;
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}
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if (!seen_addr.insert(base).second)
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{
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return;
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}
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if (identity->type() == IDTYPE_BIT_CONTAINER)
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{
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check_bit_container(base, identity);
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return;
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}
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auto item_identity = identity->getItemType();
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pointer_identity item_ptr_identity(item_identity);
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if (identity->type() == IDTYPE_PTR_CONTAINER || identity->type() == IDTYPE_STL_PTR_VECTOR)
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{
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item_identity = &item_ptr_identity;
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}
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else if (identity->type() != IDTYPE_CONTAINER)
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{
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// unexpected
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return;
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}
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auto void_name = identity->getFullName(nullptr);
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if (void_name == "vector<void>" || void_name == "vector<void*>")
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{
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check_vector(base, identity, item_identity);
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}
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else if (void_name == "deque<void>")
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{
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check_deque(base, identity, item_identity);
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}
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else
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{
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FAIL("TODO: " << void_name);
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UNEXPECTED;
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}
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}
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void Checker::check_vector(void *base, container_identity *identity, type_identity *item_identity)
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{
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struct vector_data
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{
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uintptr_t start;
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uintptr_t finish;
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uintptr_t end_of_storage;
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};
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if (identity->byte_size() != sizeof(vector_data) || identity->getFullName().find("vector<") != 0)
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{
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UNEXPECTED;
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return;
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}
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vector_data vector = *reinterpret_cast<vector_data *>(base);
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size_t item_size = item_identity->byte_size();
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ptrdiff_t length = vector.finish - vector.start;
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ptrdiff_t capacity = vector.end_of_storage - vector.start;
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bool local_ok = true;
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if (vector.start > vector.finish)
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{
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local_ok = false;
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FAIL("vector length is negative (" << (length / ssize_t(item_size)) << ")");
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}
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if (vector.start > vector.end_of_storage)
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{
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local_ok = false;
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FAIL("vector capacity is negative (" << (capacity / ssize_t(item_size)) << ")");
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}
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else if (vector.finish > vector.end_of_storage)
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{
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local_ok = false;
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FAIL("vector capacity (" << (capacity / ssize_t(item_size)) << ") is less than its length (" << (length / ssize_t(item_size)) << ")");
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}
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size_t ulength = size_t(length);
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size_t ucapacity = size_t(capacity);
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if (ulength % item_size != 0)
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{
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local_ok = false;
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FAIL("vector length is non-integer (" << (ulength / item_size) << " items plus " << (ulength % item_size) << " bytes)");
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}
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if (ucapacity % item_size != 0)
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{
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local_ok = false;
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FAIL("vector capacity is non-integer (" << (ucapacity / item_size) << " items plus " << (ucapacity % item_size) << " bytes)");
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}
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if (local_ok)
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{
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check_static_array(reinterpret_cast<void *>(vector.start), item_identity, ulength / item_size);
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}
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}
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void Checker::check_deque(void *base, container_identity *identity, type_identity *item_identity)
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{
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// TODO: check deque?
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}
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void Checker::check_bit_container(void *base, container_identity *identity)
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{
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if (identity->getFullName() == "BitArray<>")
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{
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// TODO: check DFHack::BitArray?
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return;
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}
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struct biterator_data
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{
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uintptr_t ptr;
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unsigned int offset;
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};
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struct bvector_data
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{
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biterator_data start;
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biterator_data finish;
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uintptr_t end_of_storage;
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};
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if (identity->byte_size() != sizeof(bvector_data) || identity->getFullName() != "vector<bool>")
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{
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UNEXPECTED;
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return;
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}
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// TODO: check vector<bool>?
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}
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void Checker::check_virtual(void *base, virtual_identity *identity)
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{
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if (!seen_addr.insert(base).second)
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{
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return;
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}
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if (!base)
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{
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// null pointer
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return;
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}
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auto ptr = reinterpret_cast<virtual_ptr>(base);
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if (!identity->is_instance(ptr))
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{
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FAIL("vtable is not a known subclass");
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// write separately to avoid losing the previous line if this segfaults
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void *vtable = *reinterpret_cast<void **>(base);
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if (!vtable)
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{
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FAIL("(vtable is null)");
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UNEXPECTED;
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return;
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}
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auto class_name = Core::getInstance().p->readClassName(vtable);
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FAIL("(subclass is " << class_name << ")");
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return;
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}
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Scope scope(this, ".");
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check_fields(base, identity->getFields());
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}
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