mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-23 15:29:51 +00:00
93b6db3de9
This totally optimizes PIC16 sections by not having an 'isdirective' bit anymore!! ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78517 91177308-0d34-0410-b5e6-96231b3b80d8
439 lines
15 KiB
C++
439 lines
15 KiB
C++
//===-- PIC16TargetObjectFile.cpp - PIC16 object files --------------------===//
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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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#include "PIC16TargetObjectFile.h"
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#include "PIC16Section.h"
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#include "PIC16ISelLowering.h"
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#include "PIC16TargetMachine.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSectionPIC16::MCSectionPIC16(const StringRef &name, SectionKind K,
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MCContext &Ctx) : MCSection(K), Name(name) {
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Ctx.SetSection(Name, this);
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}
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MCSectionPIC16 *MCSectionPIC16::Create(const StringRef &Name,
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SectionKind K, MCContext &Ctx) {
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return new (Ctx) MCSectionPIC16(Name, K, Ctx);
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}
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void MCSectionPIC16::PrintSwitchToSection(const TargetAsmInfo &TAI,
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raw_ostream &OS) const {
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OS << getName() << '\n';
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}
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PIC16TargetObjectFile::PIC16TargetObjectFile()
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: ExternalVarDecls(0), ExternalVarDefs(0) {
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}
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const MCSectionPIC16 *PIC16TargetObjectFile::
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getPIC16Section(const char *Name, SectionKind Kind) const {
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if (MCSection *S = getContext().GetSection(Name))
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return (MCSectionPIC16*)S;
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return MCSectionPIC16::Create(Name, Kind, getContext());
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}
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void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
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TargetLoweringObjectFile::Initialize(Ctx, tm);
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TM = &tm;
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BSSSection = getPIC16Section("udata.# UDATA", SectionKind::getBSS());
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ReadOnlySection = getPIC16Section("romdata.# ROMDATA",
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SectionKind::getReadOnly());
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DataSection = getPIC16Section("idata.# IDATA", SectionKind::getDataRel());
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// Need because otherwise a .text symbol is emitted by DwarfWriter
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// in BeginModule, and gpasm cribbs for that .text symbol.
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TextSection = getPIC16Section("", SectionKind::getText());
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ROSections.push_back(new PIC16Section((MCSectionPIC16*)ReadOnlySection));
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// FIXME: I don't know what the classification of these sections really is.
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ExternalVarDecls = new PIC16Section(getPIC16Section("ExternalVarDecls",
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SectionKind::getMetadata()));
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ExternalVarDefs = new PIC16Section(getPIC16Section("ExternalVarDefs",
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SectionKind::getMetadata()));
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}
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const MCSection *PIC16TargetObjectFile::
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getSectionForFunction(const std::string &FnName) const {
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std::string T = PAN::getCodeSectionName(FnName);
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return getPIC16Section(T.c_str(), SectionKind::getText());
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}
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const MCSection *PIC16TargetObjectFile::
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getSectionForFunctionFrame(const std::string &FnName) const {
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std::string T = PAN::getFrameSectionName(FnName);
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return getPIC16Section(T.c_str(), SectionKind::getDataRel());
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}
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const MCSection *
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PIC16TargetObjectFile::getBSSSectionForGlobal(const GlobalVariable *GV) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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Constant *C = GV->getInitializer();
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assert(C->isNullValue() && "Unitialized globals has non-zero initializer");
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// Find how much space this global needs.
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const TargetData *TD = TM->getTargetData();
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const Type *Ty = C->getType();
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unsigned ValSize = TD->getTypeAllocSize(Ty);
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// Go through all BSS Sections and assign this variable
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// to the first available section having enough space.
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PIC16Section *FoundBSS = NULL;
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for (unsigned i = 0; i < BSSSections.size(); i++) {
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if (DataBankSize - BSSSections[i]->Size >= ValSize) {
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FoundBSS = BSSSections[i];
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break;
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}
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}
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// No BSS section spacious enough was found. Crate a new one.
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if (!FoundBSS) {
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std::string name = PAN::getUdataSectionName(BSSSections.size());
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const MCSectionPIC16 *NewSection
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= getPIC16Section(name.c_str(), /*FIXME*/ SectionKind::getMetadata());
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FoundBSS = new PIC16Section(NewSection);
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// Add this newly created BSS section to the list of BSSSections.
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BSSSections.push_back(FoundBSS);
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}
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// Insert the GV into this BSS.
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FoundBSS->Items.push_back(GV);
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FoundBSS->Size += ValSize;
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return FoundBSS->S_;
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}
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const MCSection *
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PIC16TargetObjectFile::getIDATASectionForGlobal(const GlobalVariable *GV) const{
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assert(GV->hasInitializer() && "This global doesn't need space");
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Constant *C = GV->getInitializer();
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assert(!C->isNullValue() && "initialized globals has zero initializer");
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assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
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"can split initialized RAM data only");
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// Find how much space this global needs.
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const TargetData *TD = TM->getTargetData();
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const Type *Ty = C->getType();
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unsigned ValSize = TD->getTypeAllocSize(Ty);
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// Go through all IDATA Sections and assign this variable
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// to the first available section having enough space.
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PIC16Section *FoundIDATA = NULL;
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for (unsigned i = 0; i < IDATASections.size(); i++) {
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if (DataBankSize - IDATASections[i]->Size >= ValSize) {
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FoundIDATA = IDATASections[i];
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break;
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}
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}
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// No IDATA section spacious enough was found. Crate a new one.
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if (!FoundIDATA) {
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std::string name = PAN::getIdataSectionName(IDATASections.size());
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const MCSectionPIC16 *NewSection =
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getPIC16Section(name.c_str(), /*FIXME*/ SectionKind::getMetadata());
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FoundIDATA = new PIC16Section(NewSection);
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// Add this newly created IDATA section to the list of IDATASections.
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IDATASections.push_back(FoundIDATA);
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}
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// Insert the GV into this IDATA.
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FoundIDATA->Items.push_back(GV);
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FoundIDATA->Size += ValSize;
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return FoundIDATA->S_;
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}
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// Get the section for an automatic variable of a function.
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// For PIC16 they are globals only with mangled names.
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const MCSection *
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PIC16TargetObjectFile::getSectionForAuto(const GlobalVariable *GV) const {
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const std::string name = PAN::getSectionNameForSym(GV->getName());
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// Go through all Auto Sections and assign this variable
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// to the appropriate section.
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PIC16Section *FoundAutoSec = NULL;
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for (unsigned i = 0; i < AutosSections.size(); i++) {
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if (AutosSections[i]->S_->getName() == name) {
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FoundAutoSec = AutosSections[i];
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break;
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}
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}
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// No Auto section was found. Crate a new one.
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if (!FoundAutoSec) {
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const MCSectionPIC16 *NewSection =
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getPIC16Section(name.c_str(), /*FIXME*/ SectionKind::getMetadata());
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FoundAutoSec = new PIC16Section(NewSection);
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// Add this newly created autos section to the list of AutosSections.
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AutosSections.push_back(FoundAutoSec);
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}
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// Insert the auto into this section.
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FoundAutoSec->Items.push_back(GV);
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return FoundAutoSec->S_;
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}
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// Override default implementation to put the true globals into
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// multiple data sections if required.
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const MCSection *
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PIC16TargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV1,
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SectionKind Kind,
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Mangler *Mang,
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const TargetMachine &TM) const {
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// We select the section based on the initializer here, so it really
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// has to be a GlobalVariable.
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const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
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if (!GV)
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return TargetLoweringObjectFile::SelectSectionForGlobal(GV1, Kind, Mang,TM);
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// Record External Var Decls.
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if (GV->isDeclaration()) {
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ExternalVarDecls->Items.push_back(GV);
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return ExternalVarDecls->S_;
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}
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assert(GV->hasInitializer() && "A def without initializer?");
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// First, if this is an automatic variable for a function, get the section
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// name for it and return.
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std::string name = GV->getName();
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if (PAN::isLocalName(name))
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return getSectionForAuto(GV);
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// Record Exteranl Var Defs.
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if (GV->hasExternalLinkage() || GV->hasCommonLinkage())
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ExternalVarDefs->Items.push_back(GV);
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// See if this is an uninitialized global.
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const Constant *C = GV->getInitializer();
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if (C->isNullValue())
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return getBSSSectionForGlobal(GV);
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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return getIDATASectionForGlobal(GV);
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// This is initialized data in rom, put it in the readonly section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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return getROSectionForGlobal(GV);
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// Else let the default implementation take care of it.
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return TargetLoweringObjectFile::SelectSectionForGlobal(GV, Kind, Mang,TM);
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}
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PIC16TargetObjectFile::~PIC16TargetObjectFile() {
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for (unsigned i = 0; i < BSSSections.size(); i++)
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delete BSSSections[i];
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for (unsigned i = 0; i < IDATASections.size(); i++)
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delete IDATASections[i];
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for (unsigned i = 0; i < AutosSections.size(); i++)
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delete AutosSections[i];
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for (unsigned i = 0; i < ROSections.size(); i++)
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delete ROSections[i];
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delete ExternalVarDecls;
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delete ExternalVarDefs;
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}
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/// getSpecialCasedSectionGlobals - Allow the target to completely override
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/// section assignment of a global.
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const MCSection *PIC16TargetObjectFile::
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getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const {
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assert(GV->hasSection());
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if (const GlobalVariable *GVar = cast<GlobalVariable>(GV)) {
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std::string SectName = GVar->getSection();
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// If address for a variable is specified, get the address and create
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// section.
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std::string AddrStr = "Address=";
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if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
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std::string SectAddr = SectName.substr(AddrStr.length());
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return CreateSectionForGlobal(GVar, Mang, SectAddr);
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}
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// Create the section specified with section attribute.
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return CreateSectionForGlobal(GVar, Mang);
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}
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return getPIC16Section(GV->getSection().c_str(), Kind);
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}
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// Create a new section for global variable. If Addr is given then create
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// section at that address else create by name.
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const MCSection *
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PIC16TargetObjectFile::CreateSectionForGlobal(const GlobalVariable *GV,
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Mangler *Mang,
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const std::string &Addr) const {
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// See if this is an uninitialized global.
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const Constant *C = GV->getInitializer();
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if (C->isNullValue())
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return CreateBSSSectionForGlobal(GV, Addr);
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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return CreateIDATASectionForGlobal(GV, Addr);
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// This is initialized data in rom, put it in the readonly section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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return CreateROSectionForGlobal(GV, Addr);
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// Else let the default implementation take care of it.
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return TargetLoweringObjectFile::SectionForGlobal(GV, Mang, *TM);
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}
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// Create uninitialized section for a variable.
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const MCSection *
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PIC16TargetObjectFile::CreateBSSSectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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assert(GV->getInitializer()->isNullValue() &&
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"Unitialized global has non-zero initializer");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundBSS = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " UDATA";
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for (unsigned i = 0; i < BSSSections.size(); i++) {
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if (BSSSections[i]->S_->getName() == Name) {
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FoundBSS = BSSSections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getNameStr() + "." + Addr + ".";
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Name = PAN::getUdataSectionName(BSSSections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewBSS = FoundBSS;
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if (NewBSS == NULL) {
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const MCSectionPIC16 *NewSection =
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getPIC16Section(Name.c_str(), SectionKind::getBSS());
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NewBSS = new PIC16Section(NewSection);
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BSSSections.push_back(NewBSS);
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}
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// Insert the GV into this BSS.
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NewBSS->Items.push_back(GV);
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// We do not want to put any GV without explicit section into this section
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// so set its size to DatabankSize.
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NewBSS->Size = DataBankSize;
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return NewBSS->S_;
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}
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// Get rom section for a variable. Currently there can be only one rom section
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// unless a variable explicitly requests a section.
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const MCSection *
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PIC16TargetObjectFile::getROSectionForGlobal(const GlobalVariable *GV) const {
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ROSections[0]->Items.push_back(GV);
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return ROSections[0]->S_;
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}
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// Create initialized data section for a variable.
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const MCSection *
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PIC16TargetObjectFile::CreateIDATASectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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assert(!GV->getInitializer()->isNullValue() &&
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"initialized global has zero initializer");
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assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
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"can be used for initialized RAM data only");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundIDATASec = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " IDATA";
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for (unsigned i = 0; i < IDATASections.size(); i++) {
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if (IDATASections[i]->S_->getName() == Name) {
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FoundIDATASec = IDATASections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getNameStr() + "." + Addr + ".";
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Name = PAN::getIdataSectionName(IDATASections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewIDATASec = FoundIDATASec;
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if (NewIDATASec == NULL) {
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const MCSectionPIC16 *NewSection =
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getPIC16Section(Name.c_str(), /* FIXME */SectionKind::getMetadata());
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NewIDATASec = new PIC16Section(NewSection);
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IDATASections.push_back(NewIDATASec);
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}
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// Insert the GV into this IDATA Section.
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NewIDATASec->Items.push_back(GV);
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// We do not want to put any GV without explicit section into this section
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// so set its size to DatabankSize.
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NewIDATASec->Size = DataBankSize;
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return NewIDATASec->S_;
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}
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// Create a section in rom for a variable.
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const MCSection *
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PIC16TargetObjectFile::CreateROSectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE &&
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"can be used for ROM data only");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundROSec = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " ROMDATA";
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for (unsigned i = 1; i < ROSections.size(); i++) {
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if (ROSections[i]->S_->getName() == Name) {
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FoundROSec = ROSections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getNameStr() + "." + Addr + ".";
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Name = PAN::getRomdataSectionName(ROSections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewRomSec = FoundROSec;
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if (NewRomSec == NULL) {
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const MCSectionPIC16 *NewSection =
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getPIC16Section(Name.c_str(), SectionKind::getReadOnly());
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NewRomSec = new PIC16Section(NewSection);
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ROSections.push_back(NewRomSec);
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}
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// Insert the GV into this ROM Section.
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NewRomSec->Items.push_back(GV);
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return NewRomSec->S_;
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}
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