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fix: try fixing alias resolving via redirection for x64 for real

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Jan 2025-06-03 20:24:43 +01:00
parent f1a95997fe
commit 1697409cc2
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GPG Key ID: 44B581F78FF5C57C
1 changed files with 26 additions and 8 deletions
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34
src/ZoneLoading/Zone/Stream/ZoneInputStream.cpp
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@ -67,7 +67,8 @@ namespace
m_pointer_byte_count(pointerBitCount / 8u),
m_block_mask((std::numeric_limits<uintptr_t>::max() >> (sizeof(uintptr_t) * 8 - blockBitCount)) << (pointerBitCount - blockBitCount)),
m_block_shift(pointerBitCount - blockBitCount),
m_offset_mask(std::numeric_limits<uintptr_t>::max() >> (sizeof(uintptr_t) * 8 - (pointerBitCount - blockBitCount)))
m_offset_mask(std::numeric_limits<uintptr_t>::max() >> (sizeof(uintptr_t) * 8 - (pointerBitCount - blockBitCount))),
m_alias_mask(1uz << (pointerBitCount - 1uz))
{
assert(pointerBitCount % 8u == 0u);
assert(insertBlock < static_cast<block_t>(blocks.size()));
@ -294,7 +295,7 @@ namespace
IncBlockPos(*m_insert_block, m_pointer_byte_count);
const auto newLookupIndex = static_cast<uintptr_t>(m_alias_lookup.size()) + 1;
const auto newLookupIndex = static_cast<uintptr_t>(m_alias_lookup.size()) | m_alias_mask;
m_alias_lookup.emplace_back(nullptr);
std::memcpy(ptr, &newLookupIndex, m_pointer_byte_count);
@ -304,10 +305,13 @@ namespace
void SetInsertedPointerAliasLookup(const uintptr_t lookupEntry, void* value) override
{
assert(lookupEntry > 0);
assert(lookupEntry <= m_alias_lookup.size());
assert(lookupEntry & m_alias_mask);
m_alias_lookup[lookupEntry - 1] = value;
const auto aliasIndex = lookupEntry & ~m_alias_mask;
assert(aliasIndex < m_alias_lookup.size());
m_alias_lookup[aliasIndex] = value;
}
void* ConvertOffsetToPointerNative(const void* offset) override
@ -410,10 +414,23 @@ namespace
if (lookupEntry == 0)
return nullptr;
if (lookupEntry > m_pointer_redirect_lookup.size())
throw InvalidAliasLookupException(lookupEntry - 1, m_pointer_redirect_lookup.size());
return *m_pointer_redirect_lookup[lookupEntry - 1];
if (lookupEntry & m_alias_mask)
{
const auto aliasIndex = lookupEntry & ~m_alias_mask;
if (aliasIndex >= m_alias_lookup.size())
throw InvalidAliasLookupException(aliasIndex, m_alias_lookup.size());
return m_alias_lookup[aliasIndex];
}
const auto redirectIndex = lookupEntry - 1;
if (redirectIndex >= m_pointer_redirect_lookup.size())
throw InvalidAliasLookupException(redirectIndex, m_pointer_redirect_lookup.size());
return *m_pointer_redirect_lookup[redirectIndex];
}
private:
@ -470,6 +487,7 @@ namespace
std::vector<uint8_t> m_fill_buffer;
std::vector<void**> m_pointer_redirect_lookup;
std::vector<void*> m_alias_lookup;
size_t m_alias_mask;
};
} // namespace