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https://github.com/c64scene-ar/llvm-6502.git
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f1e2b23dfa
I'll be moving some more code there to gather all of the register-specific stuff in one place. Currently it is shared between CodeGenTarget and RegisterInfoEmitter. The plan is that CodeGenRegisters can compute the full register bank structure while RegisterInfoEmitter only will handle the printing part. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132788 91177308-0d34-0410-b5e6-96231b3b80d8
102 lines
4.0 KiB
C++
102 lines
4.0 KiB
C++
//===- CodeGenRegisters.cpp - Register and RegisterClass Info -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines structures to encapsulate information gleaned from the
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// target register and register class definitions.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenRegisters.h"
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#include "CodeGenTarget.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// CodeGenRegister
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//===----------------------------------------------------------------------===//
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CodeGenRegister::CodeGenRegister(Record *R) : TheDef(R) {
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CostPerUse = R->getValueAsInt("CostPerUse");
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}
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const std::string &CodeGenRegister::getName() const {
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return TheDef->getName();
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}
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//===----------------------------------------------------------------------===//
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// CodeGenRegisterClass
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//===----------------------------------------------------------------------===//
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CodeGenRegisterClass::CodeGenRegisterClass(Record *R) : TheDef(R) {
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// Rename anonymous register classes.
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if (R->getName().size() > 9 && R->getName()[9] == '.') {
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static unsigned AnonCounter = 0;
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R->setName("AnonRegClass_"+utostr(AnonCounter++));
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}
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std::vector<Record*> TypeList = R->getValueAsListOfDefs("RegTypes");
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for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
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Record *Type = TypeList[i];
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if (!Type->isSubClassOf("ValueType"))
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throw "RegTypes list member '" + Type->getName() +
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"' does not derive from the ValueType class!";
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VTs.push_back(getValueType(Type));
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}
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assert(!VTs.empty() && "RegisterClass must contain at least one ValueType!");
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std::vector<Record*> RegList = R->getValueAsListOfDefs("MemberList");
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for (unsigned i = 0, e = RegList.size(); i != e; ++i) {
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Record *Reg = RegList[i];
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if (!Reg->isSubClassOf("Register"))
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throw "Register Class member '" + Reg->getName() +
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"' does not derive from the Register class!";
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Elements.push_back(Reg);
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}
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// SubRegClasses is a list<dag> containing (RC, subregindex, ...) dags.
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ListInit *SRC = R->getValueAsListInit("SubRegClasses");
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for (ListInit::const_iterator i = SRC->begin(), e = SRC->end(); i != e; ++i) {
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DagInit *DAG = dynamic_cast<DagInit*>(*i);
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if (!DAG) throw "SubRegClasses must contain DAGs";
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DefInit *DAGOp = dynamic_cast<DefInit*>(DAG->getOperator());
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Record *RCRec;
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if (!DAGOp || !(RCRec = DAGOp->getDef())->isSubClassOf("RegisterClass"))
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throw "Operator '" + DAG->getOperator()->getAsString() +
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"' in SubRegClasses is not a RegisterClass";
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// Iterate over args, all SubRegIndex instances.
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for (DagInit::const_arg_iterator ai = DAG->arg_begin(), ae = DAG->arg_end();
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ai != ae; ++ai) {
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DefInit *Idx = dynamic_cast<DefInit*>(*ai);
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Record *IdxRec;
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if (!Idx || !(IdxRec = Idx->getDef())->isSubClassOf("SubRegIndex"))
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throw "Argument '" + (*ai)->getAsString() +
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"' in SubRegClasses is not a SubRegIndex";
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if (!SubRegClasses.insert(std::make_pair(IdxRec, RCRec)).second)
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throw "SubRegIndex '" + IdxRec->getName() + "' mentioned twice";
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}
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}
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// Allow targets to override the size in bits of the RegisterClass.
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unsigned Size = R->getValueAsInt("Size");
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Namespace = R->getValueAsString("Namespace");
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SpillSize = Size ? Size : EVT(VTs[0]).getSizeInBits();
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SpillAlignment = R->getValueAsInt("Alignment");
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CopyCost = R->getValueAsInt("CopyCost");
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Allocatable = R->getValueAsBit("isAllocatable");
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MethodBodies = R->getValueAsCode("MethodBodies");
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MethodProtos = R->getValueAsCode("MethodProtos");
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}
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const std::string &CodeGenRegisterClass::getName() const {
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return TheDef->getName();
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}
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