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DiskCache: Apply relocations from disk blob

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Removes one allocation in Lookup path.
This commit is contained in:
Pierre-Loup A. Griffais committed 2026-08-27 22:45:09 -07:00
1 parent fd180a16d3
commit 8b9237fd52
5 files changed
+87 -53
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FEXCore/Source/Interface/Core/DiskCache.cpp
+10 -37
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@@ -451,45 +451,18 @@ namespace DiskCache {
return std::nullopt;
}
HitData.HostCode = {HitData.Blob.data() + sizeof(Header), Header.HostSize};
HitData.EntryPoints = {reinterpret_cast<const BlobEntryPoint*>(HitData.Blob.data() + sizeof(Header) + Header.HostSize), Header.EntryPointCount};
uint32_t BlobOffset = sizeof(Header);
auto* SmallRelocs = reinterpret_cast<const BlobSmallRelocation*>(
HitData.Blob.data() + sizeof(Header) + Header.HostSize + Header.EntryPointCount * sizeof(BlobEntryPoint));
auto* ThunkRelocs = reinterpret_cast<const BlobThunkRelocation*>(
reinterpret_cast<const uint8_t*>(SmallRelocs) + Header.SmallRelocCount * sizeof(BlobSmallRelocation));
HitData.HostCode = {HitData.Blob.data() + BlobOffset, Header.HostSize};
BlobOffset += Header.HostSize;
HitData.EntryPoints = {reinterpret_cast<const BlobEntryPoint*>(HitData.Blob.data() + BlobOffset), Header.EntryPointCount};
BlobOffset += Header.EntryPointCount * sizeof(BlobEntryPoint);
HitData.SmallRelocs = {reinterpret_cast<const BlobSmallRelocation*>(HitData.Blob.data() + BlobOffset), Header.SmallRelocCount};
BlobOffset += Header.SmallRelocCount * sizeof(BlobSmallRelocation);
HitData.ThunkRelocs = {reinterpret_cast<const BlobThunkRelocation*>(HitData.Blob.data() + BlobOffset), Header.ThunkRelocCount};
BlobOffset += Header.ThunkRelocCount * sizeof(BlobThunkRelocation);
HitData.Relocations.reserve(Header.SmallRelocCount + Header.ThunkRelocCount);
for (uint32_t i = 0; i < Header.SmallRelocCount; ++i) {
const auto& SmallReloc = SmallRelocs[i];
FEXCore::CPU::Relocation Reloc = FEXCore::CPU::Relocation::Default();
Reloc.Header.Type = (CPU::RelocationTypes)SmallReloc.Type;
Reloc.Header.Offset = SmallReloc.Offset;
switch (SmallReloc.Type) {
case uint8_t(CPU::RelocationTypes::RELOC_NAMED_SYMBOL_LITERAL):
Reloc.NamedSymbolLiteral.Symbol = CPU::RelocNamedSymbolLiteral::NamedSymbol(SmallReloc.Named.Symbol);
break;
case uint8_t(CPU::RelocationTypes::RELOC_GUEST_RIP_LITERAL): Reloc.GuestRIP.GuestRIP = SmallReloc.RIPLiteral.GuestRIP; break;
case uint8_t(CPU::RelocationTypes::RELOC_GUEST_RIP_MOVE):
Reloc.GuestRIP.RegisterIndex = SmallReloc.RIPMove.RegisterIndex;
Reloc.GuestRIP.GuestRIP = SmallReloc.RIPMove.GuestRIP;
break;
default: return std::nullopt;
}
HitData.Relocations.push_back(Reloc);
}
for (uint32_t i = 0; i < Header.ThunkRelocCount; ++i) {
const auto& BigReloc = ThunkRelocs[i];
FEXCore::CPU::Relocation Reloc = FEXCore::CPU::Relocation::Default();
Reloc.NamedThunkMove.Header.Offset = BigReloc.Offset;
Reloc.NamedThunkMove.Header.Type = CPU::RelocationTypes::RELOC_NAMED_THUNK_MOVE;
Reloc.NamedThunkMove.RegisterIndex = BigReloc.RegisterIndex;
memcpy(&Reloc.NamedThunkMove.Symbol, BigReloc.SymbolHash, sizeof(BigReloc.SymbolHash));
HitData.Relocations.push_back(Reloc);
}
auto* PageOffsets =
reinterpret_cast<const int64_t*>(reinterpret_cast<const uint8_t*>(ThunkRelocs) + Header.ThunkRelocCount * sizeof(BlobThunkRelocation));
auto* PageOffsets = reinterpret_cast<const int64_t*>(HitData.Blob.data() + BlobOffset);
HitData.GuestPages.reserve(Header.TouchedGuestPagesCount);
for (uint32_t i = 0; i < Header.TouchedGuestPagesCount; ++i) {
HitData.GuestPages.push_back(GuestRIP + PageOffsets[i]);