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//===-- StableFunctionMapRecord.cpp ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This implements the functionality for the StableFunctionMapRecord class,
// including methods for serialization and deserialization of stable function
// maps to and from raw and YAML streams. It also includes utilities for
// managing function entries and their metadata.
//
//===----------------------------------------------------------------------===//
#include "llvm/CGData/StableFunctionMapRecord.h"
#include "llvm/Support/EndianStream.h"
#define DEBUG_TYPE "stable-function-map-record"
using namespace llvm;
using namespace llvm::support;
LLVM_YAML_IS_SEQUENCE_VECTOR(IndexPairHash)
LLVM_YAML_IS_SEQUENCE_VECTOR(StableFunction)
namespace llvm {
namespace yaml {
template <> struct MappingTraits<IndexPairHash> {
static void mapping(IO &IO, IndexPairHash &Key) {
IO.mapRequired("InstIndex", Key.first.first);
IO.mapRequired("OpndIndex", Key.first.second);
IO.mapRequired("OpndHash", Key.second);
}
};
template <> struct MappingTraits<StableFunction> {
static void mapping(IO &IO, StableFunction &Func) {
IO.mapRequired("Hash", Func.Hash);
IO.mapRequired("FunctionName", Func.FunctionName);
IO.mapRequired("ModuleName", Func.ModuleName);
IO.mapRequired("InstCount", Func.InstCount);
IO.mapRequired("IndexOperandHashes", Func.IndexOperandHashes);
}
};
} // namespace yaml
} // namespace llvm
// Get a sorted vector of StableFunctionEntry pointers.
static SmallVector<const StableFunctionMap::StableFunctionEntry *>
getStableFunctionEntries(const StableFunctionMap &SFM) {
SmallVector<const StableFunctionMap::StableFunctionEntry *> FuncEntries;
for (const auto &P : SFM.getFunctionMap())
for (auto &Func : P.second)
FuncEntries.emplace_back(Func.get());
std::stable_sort(
FuncEntries.begin(), FuncEntries.end(), [&](auto &A, auto &B) {
return std::tuple(A->Hash, SFM.getNameForId(A->ModuleNameId),
SFM.getNameForId(A->FunctionNameId)) <
std::tuple(B->Hash, SFM.getNameForId(B->ModuleNameId),
SFM.getNameForId(B->FunctionNameId));
});
return FuncEntries;
}
// Get a sorted vector of IndexOperandHashes.
static IndexOperandHashVecType getStableIndexOperandHashes(
const StableFunctionMap::StableFunctionEntry *FuncEntry) {
IndexOperandHashVecType IndexOperandHashes;
for (auto &[Indices, OpndHash] : *FuncEntry->IndexOperandHashMap)
IndexOperandHashes.emplace_back(Indices, OpndHash);
// The indices are unique, so we can just sort by the first.
llvm::sort(IndexOperandHashes);
return IndexOperandHashes;
}
void StableFunctionMapRecord::serialize(raw_ostream &OS) const {
serialize(OS, FunctionMap.get());
}
void StableFunctionMapRecord::serialize(raw_ostream &OS,
const StableFunctionMap *FunctionMap) {
support::endian::Writer Writer(OS, endianness::little);
// Write Names.
auto &Names = FunctionMap->getNames();
uint32_t ByteSize = 4;
Writer.write<uint32_t>(Names.size());
for (auto &Name : Names) {
Writer.OS << Name << '\0';
ByteSize += Name.size() + 1;
}
// Align ByteSize to 4 bytes.
uint32_t Padding = offsetToAlignment(ByteSize, Align(4));
for (uint32_t I = 0; I < Padding; ++I)
Writer.OS << '\0';
// Write StableFunctionEntries whose pointers are sorted.
auto FuncEntries = getStableFunctionEntries(*FunctionMap);
Writer.write<uint32_t>(FuncEntries.size());
for (const auto *FuncRef : FuncEntries) {
Writer.write<stable_hash>(FuncRef->Hash);
Writer.write<uint32_t>(FuncRef->FunctionNameId);
Writer.write<uint32_t>(FuncRef->ModuleNameId);
Writer.write<uint32_t>(FuncRef->InstCount);
// Emit IndexOperandHashes sorted from IndexOperandHashMap.
IndexOperandHashVecType IndexOperandHashes =
getStableIndexOperandHashes(FuncRef);
Writer.write<uint32_t>(IndexOperandHashes.size());
for (auto &IndexOperandHash : IndexOperandHashes) {
Writer.write<uint32_t>(IndexOperandHash.first.first);
Writer.write<uint32_t>(IndexOperandHash.first.second);
Writer.write<stable_hash>(IndexOperandHash.second);
}
}
}
void StableFunctionMapRecord::deserialize(const unsigned char *&Ptr) {
// Assert that Ptr is 4-byte aligned
assert(((uintptr_t)Ptr % 4) == 0);
// Read Names.
auto NumNames =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
// Early exit if there is no name.
if (NumNames == 0)
return;
for (unsigned I = 0; I < NumNames; ++I) {
StringRef Name(reinterpret_cast<const char *>(Ptr));
Ptr += Name.size() + 1;
FunctionMap->getIdOrCreateForName(Name);
}
// Align Ptr to 4 bytes.
Ptr = reinterpret_cast<const uint8_t *>(alignAddr(Ptr, Align(4)));
// Read StableFunctionEntries.
auto NumFuncs =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
for (unsigned I = 0; I < NumFuncs; ++I) {
auto Hash =
endian::readNext<stable_hash, endianness::little, unaligned>(Ptr);
auto FunctionNameId =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
assert(FunctionMap->getNameForId(FunctionNameId) &&
"FunctionNameId out of range");
auto ModuleNameId =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
assert(FunctionMap->getNameForId(ModuleNameId) &&
"ModuleNameId out of range");
auto InstCount =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
// Read IndexOperandHashes to build IndexOperandHashMap
auto NumIndexOperandHashes =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
auto IndexOperandHashMap = std::make_unique<IndexOperandHashMapType>();
for (unsigned J = 0; J < NumIndexOperandHashes; ++J) {
auto InstIndex =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
auto OpndIndex =
endian::readNext<uint32_t, endianness::little, unaligned>(Ptr);
auto OpndHash =
endian::readNext<stable_hash, endianness::little, unaligned>(Ptr);
assert(InstIndex < InstCount && "InstIndex out of range");
IndexOperandHashMap->try_emplace({InstIndex, OpndIndex}, OpndHash);
}
// Insert a new StableFunctionEntry into the map.
auto FuncEntry = std::make_unique<StableFunctionMap::StableFunctionEntry>(
Hash, FunctionNameId, ModuleNameId, InstCount,
std::move(IndexOperandHashMap));
FunctionMap->insert(std::move(FuncEntry));
}
}
void StableFunctionMapRecord::serializeYAML(yaml::Output &YOS) const {
auto FuncEntries = getStableFunctionEntries(*FunctionMap);
SmallVector<StableFunction> Functions;
for (const auto *FuncEntry : FuncEntries) {
auto IndexOperandHashes = getStableIndexOperandHashes(FuncEntry);
Functions.emplace_back(
FuncEntry->Hash, *FunctionMap->getNameForId(FuncEntry->FunctionNameId),
*FunctionMap->getNameForId(FuncEntry->ModuleNameId),
FuncEntry->InstCount, std::move(IndexOperandHashes));
}
YOS << Functions;
}
void StableFunctionMapRecord::deserializeYAML(yaml::Input &YIS) {
std::vector<StableFunction> Funcs;
YIS >> Funcs;
for (auto &Func : Funcs)
FunctionMap->insert(Func);
YIS.nextDocument();
}
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