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clang-p2996/llvm/utils/TableGen/Common/PredicateExpander.cpp
Pierre van Houtryve fa3d789df1 [RFC][TableGen] Restructure TableGen Source (#80847) 
Refactor of the llvm-tblgen source into:
- a "Basic" library, which contains the bare minimum utilities to build
`llvm-min-tablegen`
- a "Common" library which contains all of the helpers for TableGen
backends. Such helpers can be shared by more than one backend, and even
unit tested (e.g. CodeExpander is, maybe we can add more over time)

Fixes #80647
2024-03-25 09:40:35 +01:00

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//===--------------------- PredicateExpander.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
//
//===----------------------------------------------------------------------===//
/// \file
/// Functionalities used by the Tablegen backends to expand machine predicates.
//
//===----------------------------------------------------------------------===//
#include "PredicateExpander.h"
#include "CodeGenSchedule.h" // Definition of STIPredicateFunction.
#include "llvm/TableGen/Record.h"
namespace llvm {
void PredicateExpander::expandTrue(raw_ostream &OS) { OS << "true"; }
void PredicateExpander::expandFalse(raw_ostream &OS) { OS << "false"; }
void PredicateExpander::expandCheckImmOperand(raw_ostream &OS, int OpIndex,
int ImmVal,
StringRef FunctionMapper) {
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getImm()";
if (!FunctionMapper.empty())
OS << ")";
OS << (shouldNegate() ? " != " : " == ") << ImmVal;
}
void PredicateExpander::expandCheckImmOperand(raw_ostream &OS, int OpIndex,
StringRef ImmVal,
StringRef FunctionMapper) {
if (ImmVal.empty())
expandCheckImmOperandSimple(OS, OpIndex, FunctionMapper);
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getImm()";
if (!FunctionMapper.empty())
OS << ")";
OS << (shouldNegate() ? " != " : " == ") << ImmVal;
}
void PredicateExpander::expandCheckImmOperandSimple(raw_ostream &OS,
int OpIndex,
StringRef FunctionMapper) {
if (shouldNegate())
OS << "!";
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getImm()";
if (!FunctionMapper.empty())
OS << ")";
}
void PredicateExpander::expandCheckImmOperandLT(raw_ostream &OS, int OpIndex,
int ImmVal,
StringRef FunctionMapper) {
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getImm()";
if (!FunctionMapper.empty())
OS << ")";
OS << (shouldNegate() ? " >= " : " < ") << ImmVal;
}
void PredicateExpander::expandCheckImmOperandGT(raw_ostream &OS, int OpIndex,
int ImmVal,
StringRef FunctionMapper) {
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getImm()";
if (!FunctionMapper.empty())
OS << ")";
OS << (shouldNegate() ? " <= " : " > ") << ImmVal;
}
void PredicateExpander::expandCheckRegOperand(raw_ostream &OS, int OpIndex,
const Record *Reg,
StringRef FunctionMapper) {
assert(Reg->isSubClassOf("Register") && "Expected a register Record!");
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getReg()";
if (!FunctionMapper.empty())
OS << ")";
OS << (shouldNegate() ? " != " : " == ");
const StringRef Str = Reg->getValueAsString("Namespace");
if (!Str.empty())
OS << Str << "::";
OS << Reg->getName();
}
void PredicateExpander::expandCheckRegOperandSimple(raw_ostream &OS,
int OpIndex,
StringRef FunctionMapper) {
if (shouldNegate())
OS << "!";
if (!FunctionMapper.empty())
OS << FunctionMapper << "(";
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getReg()";
if (!FunctionMapper.empty())
OS << ")";
}
void PredicateExpander::expandCheckInvalidRegOperand(raw_ostream &OS,
int OpIndex) {
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << OpIndex
<< ").getReg() " << (shouldNegate() ? "!= " : "== ") << "0";
}
void PredicateExpander::expandCheckSameRegOperand(raw_ostream &OS, int First,
int Second) {
OS << "MI" << (isByRef() ? "." : "->") << "getOperand(" << First
<< ").getReg() " << (shouldNegate() ? "!=" : "==") << " MI"
<< (isByRef() ? "." : "->") << "getOperand(" << Second << ").getReg()";
}
void PredicateExpander::expandCheckNumOperands(raw_ostream &OS, int NumOps) {
OS << "MI" << (isByRef() ? "." : "->") << "getNumOperands() "
<< (shouldNegate() ? "!= " : "== ") << NumOps;
}
void PredicateExpander::expandCheckOpcode(raw_ostream &OS, const Record *Inst) {
OS << "MI" << (isByRef() ? "." : "->") << "getOpcode() "
<< (shouldNegate() ? "!= " : "== ") << Inst->getValueAsString("Namespace")
<< "::" << Inst->getName();
}
void PredicateExpander::expandCheckOpcode(raw_ostream &OS,
const RecVec &Opcodes) {
assert(!Opcodes.empty() && "Expected at least one opcode to check!");
bool First = true;
if (Opcodes.size() == 1) {
OS << "( ";
expandCheckOpcode(OS, Opcodes[0]);
OS << " )";
return;
}
OS << '(';
increaseIndentLevel();
for (const Record *Rec : Opcodes) {
OS << '\n';
OS.indent(getIndentLevel() * 2);
if (!First)
OS << (shouldNegate() ? "&& " : "|| ");
expandCheckOpcode(OS, Rec);
First = false;
}
OS << '\n';
decreaseIndentLevel();
OS.indent(getIndentLevel() * 2);
OS << ')';
}
void PredicateExpander::expandCheckPseudo(raw_ostream &OS,
const RecVec &Opcodes) {
if (shouldExpandForMC())
expandFalse(OS);
else
expandCheckOpcode(OS, Opcodes);
}
void PredicateExpander::expandPredicateSequence(raw_ostream &OS,
const RecVec &Sequence,
bool IsCheckAll) {
assert(!Sequence.empty() && "Found an invalid empty predicate set!");
if (Sequence.size() == 1)
return expandPredicate(OS, Sequence[0]);
// Okay, there is more than one predicate in the set.
bool First = true;
OS << (shouldNegate() ? "!(" : "(");
increaseIndentLevel();
bool OldValue = shouldNegate();
setNegatePredicate(false);
for (const Record *Rec : Sequence) {
OS << '\n';
OS.indent(getIndentLevel() * 2);
if (!First)
OS << (IsCheckAll ? "&& " : "|| ");
expandPredicate(OS, Rec);
First = false;
}
OS << '\n';
decreaseIndentLevel();
OS.indent(getIndentLevel() * 2);
OS << ')';
setNegatePredicate(OldValue);
}
void PredicateExpander::expandTIIFunctionCall(raw_ostream &OS,
StringRef MethodName) {
OS << (shouldNegate() ? "!" : "");
OS << TargetName << (shouldExpandForMC() ? "_MC::" : "InstrInfo::");
OS << MethodName << (isByRef() ? "(MI)" : "(*MI)");
}
void PredicateExpander::expandCheckIsRegOperand(raw_ostream &OS, int OpIndex) {
OS << (shouldNegate() ? "!" : "") << "MI" << (isByRef() ? "." : "->")
<< "getOperand(" << OpIndex << ").isReg() ";
}
void PredicateExpander::expandCheckIsVRegOperand(raw_ostream &OS, int OpIndex) {
OS << (shouldNegate() ? "!" : "") << "MI" << (isByRef() ? "." : "->")
<< "getOperand(" << OpIndex << ").getReg().isVirtual()";
}
void PredicateExpander::expandCheckIsImmOperand(raw_ostream &OS, int OpIndex) {
OS << (shouldNegate() ? "!" : "") << "MI" << (isByRef() ? "." : "->")
<< "getOperand(" << OpIndex << ").isImm() ";
}
void PredicateExpander::expandCheckFunctionPredicateWithTII(
raw_ostream &OS, StringRef MCInstFn, StringRef MachineInstrFn,
StringRef TIIPtr) {
if (!shouldExpandForMC()) {
OS << (TIIPtr.empty() ? "TII" : TIIPtr) << "->" << MachineInstrFn;
OS << (isByRef() ? "(MI)" : "(*MI)");
return;
}
OS << MCInstFn << (isByRef() ? "(MI" : "(*MI") << ", MCII)";
}
void PredicateExpander::expandCheckFunctionPredicate(raw_ostream &OS,
StringRef MCInstFn,
StringRef MachineInstrFn) {
OS << (shouldExpandForMC() ? MCInstFn : MachineInstrFn)
<< (isByRef() ? "(MI)" : "(*MI)");
}
void PredicateExpander::expandCheckNonPortable(raw_ostream &OS,
StringRef Code) {
if (shouldExpandForMC())
return expandFalse(OS);
OS << '(' << Code << ')';
}
void PredicateExpander::expandReturnStatement(raw_ostream &OS,
const Record *Rec) {
std::string Buffer;
raw_string_ostream SS(Buffer);
SS << "return ";
expandPredicate(SS, Rec);
SS << ";";
OS << Buffer;
}
void PredicateExpander::expandOpcodeSwitchCase(raw_ostream &OS,
const Record *Rec) {
const RecVec &Opcodes = Rec->getValueAsListOfDefs("Opcodes");
for (const Record *Opcode : Opcodes) {
OS.indent(getIndentLevel() * 2);
OS << "case " << Opcode->getValueAsString("Namespace")
<< "::" << Opcode->getName() << ":\n";
}
increaseIndentLevel();
OS.indent(getIndentLevel() * 2);
expandStatement(OS, Rec->getValueAsDef("CaseStmt"));
decreaseIndentLevel();
}
void PredicateExpander::expandOpcodeSwitchStatement(raw_ostream &OS,
const RecVec &Cases,
const Record *Default) {
std::string Buffer;
raw_string_ostream SS(Buffer);
SS << "switch(MI" << (isByRef() ? "." : "->") << "getOpcode()) {\n";
for (const Record *Rec : Cases) {
expandOpcodeSwitchCase(SS, Rec);
SS << '\n';
}
// Expand the default case.
SS.indent(getIndentLevel() * 2);
SS << "default:\n";
increaseIndentLevel();
SS.indent(getIndentLevel() * 2);
expandStatement(SS, Default);
decreaseIndentLevel();
SS << '\n';
SS.indent(getIndentLevel() * 2);
SS << "} // end of switch-stmt";
OS << Buffer;
}
void PredicateExpander::expandStatement(raw_ostream &OS, const Record *Rec) {
// Assume that padding has been added by the caller.
if (Rec->isSubClassOf("MCOpcodeSwitchStatement")) {
expandOpcodeSwitchStatement(OS, Rec->getValueAsListOfDefs("Cases"),
Rec->getValueAsDef("DefaultCase"));
return;
}
if (Rec->isSubClassOf("MCReturnStatement")) {
expandReturnStatement(OS, Rec->getValueAsDef("Pred"));
return;
}
llvm_unreachable("No known rules to expand this MCStatement");
}
void PredicateExpander::expandPredicate(raw_ostream &OS, const Record *Rec) {
// Assume that padding has been added by the caller.
if (Rec->isSubClassOf("MCTrue")) {
if (shouldNegate())
return expandFalse(OS);
return expandTrue(OS);
}
if (Rec->isSubClassOf("MCFalse")) {
if (shouldNegate())
return expandTrue(OS);
return expandFalse(OS);
}
if (Rec->isSubClassOf("CheckNot")) {
flipNegatePredicate();
expandPredicate(OS, Rec->getValueAsDef("Pred"));
flipNegatePredicate();
return;
}
if (Rec->isSubClassOf("CheckIsRegOperand"))
return expandCheckIsRegOperand(OS, Rec->getValueAsInt("OpIndex"));
if (Rec->isSubClassOf("CheckIsVRegOperand"))
return expandCheckIsVRegOperand(OS, Rec->getValueAsInt("OpIndex"));
if (Rec->isSubClassOf("CheckIsImmOperand"))
return expandCheckIsImmOperand(OS, Rec->getValueAsInt("OpIndex"));
if (Rec->isSubClassOf("CheckRegOperand"))
return expandCheckRegOperand(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsDef("Reg"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckRegOperandSimple"))
return expandCheckRegOperandSimple(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckInvalidRegOperand"))
return expandCheckInvalidRegOperand(OS, Rec->getValueAsInt("OpIndex"));
if (Rec->isSubClassOf("CheckImmOperand"))
return expandCheckImmOperand(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsInt("ImmVal"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckImmOperand_s"))
return expandCheckImmOperand(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsString("ImmVal"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckImmOperandLT"))
return expandCheckImmOperandLT(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsInt("ImmVal"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckImmOperandGT"))
return expandCheckImmOperandGT(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsInt("ImmVal"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckImmOperandSimple"))
return expandCheckImmOperandSimple(OS, Rec->getValueAsInt("OpIndex"),
Rec->getValueAsString("FunctionMapper"));
if (Rec->isSubClassOf("CheckSameRegOperand"))
return expandCheckSameRegOperand(OS, Rec->getValueAsInt("FirstIndex"),
Rec->getValueAsInt("SecondIndex"));
if (Rec->isSubClassOf("CheckNumOperands"))
return expandCheckNumOperands(OS, Rec->getValueAsInt("NumOps"));
if (Rec->isSubClassOf("CheckPseudo"))
return expandCheckPseudo(OS, Rec->getValueAsListOfDefs("ValidOpcodes"));
if (Rec->isSubClassOf("CheckOpcode"))
return expandCheckOpcode(OS, Rec->getValueAsListOfDefs("ValidOpcodes"));
if (Rec->isSubClassOf("CheckAll"))
return expandPredicateSequence(OS, Rec->getValueAsListOfDefs("Predicates"),
/* AllOf */ true);
if (Rec->isSubClassOf("CheckAny"))
return expandPredicateSequence(OS, Rec->getValueAsListOfDefs("Predicates"),
/* AllOf */ false);
if (Rec->isSubClassOf("CheckFunctionPredicate")) {
return expandCheckFunctionPredicate(
OS, Rec->getValueAsString("MCInstFnName"),
Rec->getValueAsString("MachineInstrFnName"));
}
if (Rec->isSubClassOf("CheckFunctionPredicateWithTII")) {
return expandCheckFunctionPredicateWithTII(
OS, Rec->getValueAsString("MCInstFnName"),
Rec->getValueAsString("MachineInstrFnName"),
Rec->getValueAsString("TIIPtrName"));
}
if (Rec->isSubClassOf("CheckNonPortable"))
return expandCheckNonPortable(OS, Rec->getValueAsString("CodeBlock"));
if (Rec->isSubClassOf("TIIPredicate"))
return expandTIIFunctionCall(OS, Rec->getValueAsString("FunctionName"));
llvm_unreachable("No known rules to expand this MCInstPredicate");
}
void STIPredicateExpander::expandHeader(raw_ostream &OS,
const STIPredicateFunction &Fn) {
const Record *Rec = Fn.getDeclaration();
StringRef FunctionName = Rec->getValueAsString("Name");
OS.indent(getIndentLevel() * 2);
OS << "bool ";
if (shouldExpandDefinition())
OS << getClassPrefix() << "::";
OS << FunctionName << "(";
if (shouldExpandForMC())
OS << "const MCInst " << (isByRef() ? "&" : "*") << "MI";
else
OS << "const MachineInstr " << (isByRef() ? "&" : "*") << "MI";
if (Rec->getValueAsBit("UpdatesOpcodeMask"))
OS << ", APInt &Mask";
OS << (shouldExpandForMC() ? ", unsigned ProcessorID) const " : ") const ");
if (shouldExpandDefinition()) {
OS << "{\n";
return;
}
if (Rec->getValueAsBit("OverridesBaseClassMember"))
OS << "override";
OS << ";\n";
}
void STIPredicateExpander::expandPrologue(raw_ostream &OS,
const STIPredicateFunction &Fn) {
RecVec Delegates = Fn.getDeclaration()->getValueAsListOfDefs("Delegates");
bool UpdatesOpcodeMask =
Fn.getDeclaration()->getValueAsBit("UpdatesOpcodeMask");
increaseIndentLevel();
unsigned IndentLevel = getIndentLevel();
for (const Record *Delegate : Delegates) {
OS.indent(IndentLevel * 2);
OS << "if (" << Delegate->getValueAsString("Name") << "(MI";
if (UpdatesOpcodeMask)
OS << ", Mask";
if (shouldExpandForMC())
OS << ", ProcessorID";
OS << "))\n";
OS.indent((1 + IndentLevel) * 2);
OS << "return true;\n\n";
}
if (shouldExpandForMC())
return;
OS.indent(IndentLevel * 2);
OS << "unsigned ProcessorID = getSchedModel().getProcessorID();\n";
}
void STIPredicateExpander::expandOpcodeGroup(raw_ostream &OS,
const OpcodeGroup &Group,
bool ShouldUpdateOpcodeMask) {
const OpcodeInfo &OI = Group.getOpcodeInfo();
for (const PredicateInfo &PI : OI.getPredicates()) {
const APInt &ProcModelMask = PI.ProcModelMask;
bool FirstProcID = true;
for (unsigned I = 0, E = ProcModelMask.getActiveBits(); I < E; ++I) {
if (!ProcModelMask[I])
continue;
if (FirstProcID) {
OS.indent(getIndentLevel() * 2);
OS << "if (ProcessorID == " << I;
} else {
OS << " || ProcessorID == " << I;
}
FirstProcID = false;
}
OS << ") {\n";
increaseIndentLevel();
OS.indent(getIndentLevel() * 2);
if (ShouldUpdateOpcodeMask) {
if (PI.OperandMask.isZero())
OS << "Mask.clearAllBits();\n";
else
OS << "Mask = " << PI.OperandMask << ";\n";
OS.indent(getIndentLevel() * 2);
}
OS << "return ";
expandPredicate(OS, PI.Predicate);
OS << ";\n";
decreaseIndentLevel();
OS.indent(getIndentLevel() * 2);
OS << "}\n";
}
}
void STIPredicateExpander::expandBody(raw_ostream &OS,
const STIPredicateFunction &Fn) {
bool UpdatesOpcodeMask =
Fn.getDeclaration()->getValueAsBit("UpdatesOpcodeMask");
unsigned IndentLevel = getIndentLevel();
OS.indent(IndentLevel * 2);
OS << "switch(MI" << (isByRef() ? "." : "->") << "getOpcode()) {\n";
OS.indent(IndentLevel * 2);
OS << "default:\n";
OS.indent(IndentLevel * 2);
OS << " break;";
for (const OpcodeGroup &Group : Fn.getGroups()) {
for (const Record *Opcode : Group.getOpcodes()) {
OS << '\n';
OS.indent(IndentLevel * 2);
OS << "case " << getTargetName() << "::" << Opcode->getName() << ":";
}
OS << '\n';
increaseIndentLevel();
expandOpcodeGroup(OS, Group, UpdatesOpcodeMask);
OS.indent(getIndentLevel() * 2);
OS << "break;\n";
decreaseIndentLevel();
}
OS.indent(IndentLevel * 2);
OS << "}\n";
}
void STIPredicateExpander::expandEpilogue(raw_ostream &OS,
const STIPredicateFunction &Fn) {
OS << '\n';
OS.indent(getIndentLevel() * 2);
OS << "return ";
expandPredicate(OS, Fn.getDefaultReturnPredicate());
OS << ";\n";
decreaseIndentLevel();
OS.indent(getIndentLevel() * 2);
StringRef FunctionName = Fn.getDeclaration()->getValueAsString("Name");
OS << "} // " << ClassPrefix << "::" << FunctionName << "\n\n";
}
void STIPredicateExpander::expandSTIPredicate(raw_ostream &OS,
const STIPredicateFunction &Fn) {
const Record *Rec = Fn.getDeclaration();
if (shouldExpandForMC() && !Rec->getValueAsBit("ExpandForMC"))
return;
expandHeader(OS, Fn);
if (shouldExpandDefinition()) {
expandPrologue(OS, Fn);
expandBody(OS, Fn);
expandEpilogue(OS, Fn);
}
}
} // namespace llvm
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