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check-structures-sanity: update detection for GCC C++11 std::string

develop
lethosor 2023-08-01 01:54:35 -04:00
parent 0c6441619f
commit a3916cdbb6
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GPG Key ID: 76A269552F4F58C1
1 changed files with 24 additions and 40 deletions
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62
plugins/devel/check-structures-sanity/dispatch.cpp
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@ -1,5 +1,7 @@
#include "check-structures-sanity.h"
#include <cinttypes>
#include "df/large_integer.h"
Checker::Checker(color_ostream & out) :
@ -845,69 +847,51 @@ void Checker::check_stl_string(const QueueItem & item)
#else
struct string_data
{
struct string_data_inner
{
uintptr_t start;
size_t length;
union
{
char local_data[16];
size_t capacity;
int32_t refcount;
} *ptr;
};
};
#endif
auto string = reinterpret_cast<const string_data *>(item.ptr);
#ifdef WIN32
bool is_local = string->capacity < 16;
const bool is_gcc = false;
const bool is_local = string->capacity < 16;
#else
const bool is_gcc = true;
const bool is_local = string->start == reinterpret_cast<uintptr_t>(&string->local_data[0]);
#endif
const char *start = is_local ? &string->local_data[0] : reinterpret_cast<const char *>(string->start);
ptrdiff_t length = string->length;
ptrdiff_t capacity = string->capacity;
#else
if (!is_valid_dereference(QueueItem(item, "?ptr?", string->ptr), 1))
{
// nullptr is NOT okay here
FAIL("invalid string pointer " << stl_sprintf("%p", string->ptr));
return;
}
if (!is_valid_dereference(QueueItem(item, "?hdr?", string->ptr - 1), sizeof(*string->ptr)))
{
return;
}
const char *start = reinterpret_cast<const char *>(string->ptr);
ptrdiff_t length = (string->ptr - 1)->length;
ptrdiff_t capacity = (string->ptr - 1)->capacity;
#endif
(void)start;
if (length < 0)
{
FAIL("string length is negative (" << length << ")");
}
else if (capacity < 0)
else if (is_gcc && length > 0 && !is_valid_dereference(QueueItem(item, "?start?", reinterpret_cast<void *>(string->start)), 1))
{
FAIL("string capacity is negative (" << capacity << ")");
// nullptr is NOT okay here
FAIL("invalid string pointer " << stl_sprintf("0x%" PRIxPTR, string->start));
return;
}
else if (capacity < length)
else if (is_local && length >= 16)
{
FAIL("string capacity (" << capacity << ") is less than length (" << length << ")");
FAIL("string length is too large for small string (" << length << ")");
}
#ifndef WIN32
const std::string empty_string;
auto empty_string_data = reinterpret_cast<const string_data *>(&empty_string);
if (sizes && string->ptr != empty_string_data->ptr)
{
size_t allocated_size = get_allocated_size(QueueItem(item, "?hdr?", string->ptr - 1));
size_t expected_size = sizeof(*string->ptr) + capacity + 1;
if (!allocated_size)
else if ((!is_gcc || !is_local) && capacity < 0)
{
FAIL("pointer does not appear to be a string");
FAIL("string capacity is negative (" << capacity << ")");
}
else if (allocated_size != expected_size)
else if ((!is_gcc || !is_local) && capacity < length)
{
FAIL("allocated string data size (" << allocated_size << ") does not match expected size (" << expected_size << ")");
}
FAIL("string capacity (" << capacity << ") is less than length (" << length << ")");
}
#endif
}
void Checker::check_possible_pointer(const QueueItem & item, const CheckedStructure & cs)
{