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//=-- Profilesummary.cpp - Profile summary support --------------------------=//
//
// 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 file contains support for converting profile summary data from/to
// metadata.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/ProfileSummary.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Casting.h"
using namespace llvm;
// Return an MDTuple with two elements. The first element is a string Key and
// the second is a uint64_t Value.
static Metadata *getKeyValMD(LLVMContext &Context, const char *Key,
uint64_t Val) {
Type *Int64Ty = Type::getInt64Ty(Context);
Metadata *Ops[2] = {MDString::get(Context, Key),
ConstantAsMetadata::get(ConstantInt::get(Int64Ty, Val))};
return MDTuple::get(Context, Ops);
}
// Return an MDTuple with two elements. The first element is a string Key and
// the second is a string Value.
static Metadata *getKeyValMD(LLVMContext &Context, const char *Key,
const char *Val) {
Metadata *Ops[2] = {MDString::get(Context, Key), MDString::get(Context, Val)};
return MDTuple::get(Context, Ops);
}
// This returns an MDTuple representing the detiled summary. The tuple has two
// elements: a string "DetailedSummary" and an MDTuple representing the value
// of the detailed summary. Each element of this tuple is again an MDTuple whose
// elements are the (Cutoff, MinCount, NumCounts) triplet of the
// DetailedSummaryEntry.
Metadata *ProfileSummary::getDetailedSummaryMD(LLVMContext &Context) {
std::vector<Metadata *> Entries;
Type *Int32Ty = Type::getInt32Ty(Context);
Type *Int64Ty = Type::getInt64Ty(Context);
for (auto &Entry : DetailedSummary) {
Metadata *EntryMD[3] = {
ConstantAsMetadata::get(ConstantInt::get(Int32Ty, Entry.Cutoff)),
ConstantAsMetadata::get(ConstantInt::get(Int64Ty, Entry.MinCount)),
ConstantAsMetadata::get(ConstantInt::get(Int32Ty, Entry.NumCounts))};
Entries.push_back(MDTuple::get(Context, EntryMD));
}
Metadata *Ops[2] = {MDString::get(Context, "DetailedSummary"),
MDTuple::get(Context, Entries)};
return MDTuple::get(Context, Ops);
}
// This returns an MDTuple representing this ProfileSummary object. The first
// entry of this tuple is another MDTuple of two elements: a string
// "ProfileFormat" and a string representing the format ("InstrProf" or
// "SampleProfile"). The rest of the elements of the outer MDTuple are specific
// to the kind of profile summary as returned by getFormatSpecificMD.
Metadata *ProfileSummary::getMD(LLVMContext &Context) {
const char *KindStr[3] = {"InstrProf", "CSInstrProf", "SampleProfile"};
Metadata *Components[] = {
getKeyValMD(Context, "ProfileFormat", KindStr[PSK]),
getKeyValMD(Context, "TotalCount", getTotalCount()),
getKeyValMD(Context, "MaxCount", getMaxCount()),
getKeyValMD(Context, "MaxInternalCount", getMaxInternalCount()),
getKeyValMD(Context, "MaxFunctionCount", getMaxFunctionCount()),
getKeyValMD(Context, "NumCounts", getNumCounts()),
getKeyValMD(Context, "NumFunctions", getNumFunctions()),
getDetailedSummaryMD(Context),
};
return MDTuple::get(Context, Components);
}
// Parse an MDTuple representing (Key, Val) pair.
static bool getVal(MDTuple *MD, const char *Key, uint64_t &Val) {
if (!MD)
return false;
if (MD->getNumOperands() != 2)
return false;
MDString *KeyMD = dyn_cast<MDString>(MD->getOperand(0));
ConstantAsMetadata *ValMD = dyn_cast<ConstantAsMetadata>(MD->getOperand(1));
if (!KeyMD || !ValMD)
return false;
if (!KeyMD->getString().equals(Key))
return false;
Val = cast<ConstantInt>(ValMD->getValue())->getZExtValue();
return true;
}
// Check if an MDTuple represents a (Key, Val) pair.
static bool isKeyValuePair(MDTuple *MD, const char *Key, const char *Val) {
if (!MD || MD->getNumOperands() != 2)
return false;
MDString *KeyMD = dyn_cast<MDString>(MD->getOperand(0));
MDString *ValMD = dyn_cast<MDString>(MD->getOperand(1));
if (!KeyMD || !ValMD)
return false;
if (!KeyMD->getString().equals(Key) || !ValMD->getString().equals(Val))
return false;
return true;
}
// Parse an MDTuple representing detailed summary.
static bool getSummaryFromMD(MDTuple *MD, SummaryEntryVector &Summary) {
if (!MD || MD->getNumOperands() != 2)
return false;
MDString *KeyMD = dyn_cast<MDString>(MD->getOperand(0));
if (!KeyMD || !KeyMD->getString().equals("DetailedSummary"))
return false;
MDTuple *EntriesMD = dyn_cast<MDTuple>(MD->getOperand(1));
if (!EntriesMD)
return false;
for (auto &&MDOp : EntriesMD->operands()) {
MDTuple *EntryMD = dyn_cast<MDTuple>(MDOp);
if (!EntryMD || EntryMD->getNumOperands() != 3)
return false;
ConstantAsMetadata *Op0 =
dyn_cast<ConstantAsMetadata>(EntryMD->getOperand(0));
ConstantAsMetadata *Op1 =
dyn_cast<ConstantAsMetadata>(EntryMD->getOperand(1));
ConstantAsMetadata *Op2 =
dyn_cast<ConstantAsMetadata>(EntryMD->getOperand(2));
if (!Op0 || !Op1 || !Op2)
return false;
Summary.emplace_back(cast<ConstantInt>(Op0->getValue())->getZExtValue(),
cast<ConstantInt>(Op1->getValue())->getZExtValue(),
cast<ConstantInt>(Op2->getValue())->getZExtValue());
}
return true;
}
ProfileSummary *ProfileSummary::getFromMD(Metadata *MD) {
MDTuple *Tuple = dyn_cast_or_null<MDTuple>(MD);
if (!Tuple || Tuple->getNumOperands() != 8)
return nullptr;
auto &FormatMD = Tuple->getOperand(0);
ProfileSummary::Kind SummaryKind;
if (isKeyValuePair(dyn_cast_or_null<MDTuple>(FormatMD), "ProfileFormat",
"SampleProfile"))
SummaryKind = PSK_Sample;
else if (isKeyValuePair(dyn_cast_or_null<MDTuple>(FormatMD), "ProfileFormat",
"InstrProf"))
SummaryKind = PSK_Instr;
else if (isKeyValuePair(dyn_cast_or_null<MDTuple>(FormatMD), "ProfileFormat",
"CSInstrProf"))
SummaryKind = PSK_CSInstr;
else
return nullptr;
uint64_t NumCounts, TotalCount, NumFunctions, MaxFunctionCount, MaxCount,
MaxInternalCount;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(1)), "TotalCount",
TotalCount))
return nullptr;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(2)), "MaxCount", MaxCount))
return nullptr;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(3)), "MaxInternalCount",
MaxInternalCount))
return nullptr;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(4)), "MaxFunctionCount",
MaxFunctionCount))
return nullptr;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(5)), "NumCounts", NumCounts))
return nullptr;
if (!getVal(dyn_cast<MDTuple>(Tuple->getOperand(6)), "NumFunctions",
NumFunctions))
return nullptr;
SummaryEntryVector Summary;
if (!getSummaryFromMD(dyn_cast<MDTuple>(Tuple->getOperand(7)), Summary))
return nullptr;
return new ProfileSummary(SummaryKind, std::move(Summary), TotalCount,
MaxCount, MaxInternalCount, MaxFunctionCount,
NumCounts, NumFunctions);
}
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