llvm-6502/lib/Target/PIC16/PIC16TargetObjectFile.cpp

410 lines
15 KiB
C++
Raw Normal View History

//===-- PIC16TargetObjectFile.cpp - PIC16 object files --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "PIC16TargetObjectFile.h"
#include "PIC16ISelLowering.h"
#include "PIC16TargetMachine.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/MC/MCSection.h"
using namespace llvm;
PIC16TargetObjectFile::PIC16TargetObjectFile()
: ExternalVarDecls(0), ExternalVarDefs(0)
{
}
void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
TargetLoweringObjectFile::Initialize(Ctx, tm);
TM = &tm;
BSSSection = getOrCreateSection("udata.# UDATA", false,
SectionKind::getBSS());
ReadOnlySection = getOrCreateSection("romdata.# ROMDATA", false,
SectionKind::getReadOnly());
DataSection = getOrCreateSection("idata.# IDATA", false,
SectionKind::getDataRel());
// Need because otherwise a .text symbol is emitted by DwarfWriter
// in BeginModule, and gpasm cribbs for that .text symbol.
TextSection = getOrCreateSection("", true,
SectionKind::getText());
ROSections.push_back(new PIC16Section(ReadOnlySection));
// FIXME: I don't know what the classification of these sections really is.
ExternalVarDecls = new PIC16Section(getOrCreateSection("ExternalVarDecls",
false,
SectionKind::getMetadata()));
ExternalVarDefs = new PIC16Section(getOrCreateSection("ExternalVarDefs",
false,
SectionKind::getMetadata()));
}
const MCSection *
PIC16TargetObjectFile::getBSSSectionForGlobal(const GlobalVariable *GV) const {
assert(GV->hasInitializer() && "This global doesn't need space");
Constant *C = GV->getInitializer();
assert(C->isNullValue() && "Unitialized globals has non-zero initializer");
// Find how much space this global needs.
const TargetData *TD = TM->getTargetData();
const Type *Ty = C->getType();
unsigned ValSize = TD->getTypeAllocSize(Ty);
// Go through all BSS Sections and assign this variable
// to the first available section having enough space.
PIC16Section *FoundBSS = NULL;
for (unsigned i = 0; i < BSSSections.size(); i++) {
if (DataBankSize - BSSSections[i]->Size >= ValSize) {
FoundBSS = BSSSections[i];
break;
}
}
// No BSS section spacious enough was found. Crate a new one.
if (!FoundBSS) {
std::string name = PAN::getUdataSectionName(BSSSections.size());
const MCSection *NewSection = getOrCreateSection(name.c_str(), false,
// FIXME.
SectionKind::getMetadata());
FoundBSS = new PIC16Section(NewSection);
// Add this newly created BSS section to the list of BSSSections.
BSSSections.push_back(FoundBSS);
}
// Insert the GV into this BSS.
FoundBSS->Items.push_back(GV);
FoundBSS->Size += ValSize;
return FoundBSS->S_;
}
const MCSection *
PIC16TargetObjectFile::getIDATASectionForGlobal(const GlobalVariable *GV) const{
assert(GV->hasInitializer() && "This global doesn't need space");
Constant *C = GV->getInitializer();
assert(!C->isNullValue() && "initialized globals has zero initializer");
assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
"can split initialized RAM data only");
// Find how much space this global needs.
const TargetData *TD = TM->getTargetData();
const Type *Ty = C->getType();
unsigned ValSize = TD->getTypeAllocSize(Ty);
// Go through all IDATA Sections and assign this variable
// to the first available section having enough space.
PIC16Section *FoundIDATA = NULL;
for (unsigned i = 0; i < IDATASections.size(); i++) {
if (DataBankSize - IDATASections[i]->Size >= ValSize) {
FoundIDATA = IDATASections[i];
break;
}
}
// No IDATA section spacious enough was found. Crate a new one.
if (!FoundIDATA) {
std::string name = PAN::getIdataSectionName(IDATASections.size());
const MCSection *NewSection = getOrCreateSection(name.c_str(), false,
// FIXME.
SectionKind::getMetadata());
FoundIDATA = new PIC16Section(NewSection);
// Add this newly created IDATA section to the list of IDATASections.
IDATASections.push_back(FoundIDATA);
}
// Insert the GV into this IDATA.
FoundIDATA->Items.push_back(GV);
FoundIDATA->Size += ValSize;
return FoundIDATA->S_;
}
// Get the section for an automatic variable of a function.
// For PIC16 they are globals only with mangled names.
const MCSection *
PIC16TargetObjectFile::getSectionForAuto(const GlobalVariable *GV) const {
const std::string name = PAN::getSectionNameForSym(GV->getName());
// Go through all Auto Sections and assign this variable
// to the appropriate section.
PIC16Section *FoundAutoSec = NULL;
for (unsigned i = 0; i < AutosSections.size(); i++) {
if (AutosSections[i]->S_->getName() == name) {
FoundAutoSec = AutosSections[i];
break;
}
}
// No Auto section was found. Crate a new one.
if (!FoundAutoSec) {
const MCSection *NewSection = getOrCreateSection(name.c_str(),
// FIXME.
false,
SectionKind::getMetadata());
FoundAutoSec = new PIC16Section(NewSection);
// Add this newly created autos section to the list of AutosSections.
AutosSections.push_back(FoundAutoSec);
}
// Insert the auto into this section.
FoundAutoSec->Items.push_back(GV);
return FoundAutoSec->S_;
}
// Override default implementation to put the true globals into
// multiple data sections if required.
const MCSection *
PIC16TargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV1,
SectionKind Kind,
Mangler *Mang,
const TargetMachine &TM) const {
// We select the section based on the initializer here, so it really
// has to be a GlobalVariable.
const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
if (!GV)
return TargetLoweringObjectFile::SelectSectionForGlobal(GV1, Kind, Mang,TM);
// Record External Var Decls.
if (GV->isDeclaration()) {
ExternalVarDecls->Items.push_back(GV);
return ExternalVarDecls->S_;
}
assert(GV->hasInitializer() && "A def without initializer?");
// First, if this is an automatic variable for a function, get the section
// name for it and return.
std::string name = GV->getName();
if (PAN::isLocalName(name))
return getSectionForAuto(GV);
// Record Exteranl Var Defs.
if (GV->hasExternalLinkage() || GV->hasCommonLinkage())
ExternalVarDefs->Items.push_back(GV);
// See if this is an uninitialized global.
const Constant *C = GV->getInitializer();
if (C->isNullValue())
return getBSSSectionForGlobal(GV);
// If this is initialized data in RAM. Put it in the correct IDATA section.
if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
return getIDATASectionForGlobal(GV);
// This is initialized data in rom, put it in the readonly section.
if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
return getROSectionForGlobal(GV);
// Else let the default implementation take care of it.
return TargetLoweringObjectFile::SelectSectionForGlobal(GV, Kind, Mang,TM);
}
PIC16TargetObjectFile::~PIC16TargetObjectFile() {
for (unsigned i = 0; i < BSSSections.size(); i++)
delete BSSSections[i];
for (unsigned i = 0; i < IDATASections.size(); i++)
delete IDATASections[i];
for (unsigned i = 0; i < AutosSections.size(); i++)
delete AutosSections[i];
for (unsigned i = 0; i < ROSections.size(); i++)
delete ROSections[i];
delete ExternalVarDecls;
delete ExternalVarDefs;
}
/// getSpecialCasedSectionGlobals - Allow the target to completely override
/// section assignment of a global.
const MCSection *
PIC16TargetObjectFile::getSpecialCasedSectionGlobals(const GlobalValue *GV,
Mangler *Mang,
SectionKind Kind) const {
// If GV has a sectin name or section address create that section now.
if (GV->hasSection()) {
if (const GlobalVariable *GVar = cast<GlobalVariable>(GV)) {
std::string SectName = GVar->getSection();
// If address for a variable is specified, get the address and create
// section.
std::string AddrStr = "Address=";
if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
std::string SectAddr = SectName.substr(AddrStr.length());
return CreateSectionForGlobal(GVar, Mang, SectAddr);
}
// Create the section specified with section attribute.
return CreateSectionForGlobal(GVar, Mang);
}
}
return 0;
}
// Create a new section for global variable. If Addr is given then create
// section at that address else create by name.
const MCSection *
PIC16TargetObjectFile::CreateSectionForGlobal(const GlobalVariable *GV,
Mangler *Mang,
const std::string &Addr) const {
// See if this is an uninitialized global.
const Constant *C = GV->getInitializer();
if (C->isNullValue())
return CreateBSSSectionForGlobal(GV, Addr);
// If this is initialized data in RAM. Put it in the correct IDATA section.
if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
return CreateIDATASectionForGlobal(GV, Addr);
// This is initialized data in rom, put it in the readonly section.
if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
return CreateROSectionForGlobal(GV, Addr);
// Else let the default implementation take care of it.
return TargetLoweringObjectFile::SectionForGlobal(GV, Mang, *TM);
}
// Create uninitialized section for a variable.
const MCSection *
PIC16TargetObjectFile::CreateBSSSectionForGlobal(const GlobalVariable *GV,
std::string Addr) const {
assert(GV->hasInitializer() && "This global doesn't need space");
assert(GV->getInitializer()->isNullValue() &&
"Unitialized global has non-zero initializer");
std::string Name;
// If address is given then create a section at that address else create a
// section by section name specified in GV.
PIC16Section *FoundBSS = NULL;
if (Addr.empty()) {
Name = GV->getSection() + " UDATA";
for (unsigned i = 0; i < BSSSections.size(); i++) {
if (BSSSections[i]->S_->getName() == Name) {
FoundBSS = BSSSections[i];
break;
}
}
} else {
std::string Prefix = GV->getNameStr() + "." + Addr + ".";
Name = PAN::getUdataSectionName(BSSSections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewBSS = FoundBSS;
if (NewBSS == NULL) {
const MCSection *NewSection = getOrCreateSection(Name.c_str(), false,
SectionKind::getBSS());
NewBSS = new PIC16Section(NewSection);
BSSSections.push_back(NewBSS);
}
// Insert the GV into this BSS.
NewBSS->Items.push_back(GV);
// We do not want to put any GV without explicit section into this section
// so set its size to DatabankSize.
NewBSS->Size = DataBankSize;
return NewBSS->S_;
}
// Get rom section for a variable. Currently there can be only one rom section
// unless a variable explicitly requests a section.
const MCSection *
PIC16TargetObjectFile::getROSectionForGlobal(const GlobalVariable *GV) const {
ROSections[0]->Items.push_back(GV);
return ROSections[0]->S_;
}
// Create initialized data section for a variable.
const MCSection *
PIC16TargetObjectFile::CreateIDATASectionForGlobal(const GlobalVariable *GV,
std::string Addr) const {
assert(GV->hasInitializer() && "This global doesn't need space");
assert(!GV->getInitializer()->isNullValue() &&
"initialized global has zero initializer");
assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
"can be used for initialized RAM data only");
std::string Name;
// If address is given then create a section at that address else create a
// section by section name specified in GV.
PIC16Section *FoundIDATASec = NULL;
if (Addr.empty()) {
Name = GV->getSection() + " IDATA";
for (unsigned i = 0; i < IDATASections.size(); i++) {
if (IDATASections[i]->S_->getName() == Name) {
FoundIDATASec = IDATASections[i];
break;
}
}
} else {
std::string Prefix = GV->getNameStr() + "." + Addr + ".";
Name = PAN::getIdataSectionName(IDATASections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewIDATASec = FoundIDATASec;
if (NewIDATASec == NULL) {
const MCSection *NewSection = getOrCreateSection(Name.c_str(), false,
// FIXME:
SectionKind::getMetadata());
NewIDATASec = new PIC16Section(NewSection);
IDATASections.push_back(NewIDATASec);
}
// Insert the GV into this IDATA Section.
NewIDATASec->Items.push_back(GV);
// We do not want to put any GV without explicit section into this section
// so set its size to DatabankSize.
NewIDATASec->Size = DataBankSize;
return NewIDATASec->S_;
}
// Create a section in rom for a variable.
const MCSection *
PIC16TargetObjectFile::CreateROSectionForGlobal(const GlobalVariable *GV,
std::string Addr) const {
assert(GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE &&
"can be used for ROM data only");
std::string Name;
// If address is given then create a section at that address else create a
// section by section name specified in GV.
PIC16Section *FoundROSec = NULL;
if (Addr.empty()) {
Name = GV->getSection() + " ROMDATA";
for (unsigned i = 1; i < ROSections.size(); i++) {
if (ROSections[i]->S_->getName() == Name) {
FoundROSec = ROSections[i];
break;
}
}
} else {
std::string Prefix = GV->getNameStr() + "." + Addr + ".";
Name = PAN::getRomdataSectionName(ROSections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewRomSec = FoundROSec;
if (NewRomSec == NULL) {
const MCSection *NewSection = getOrCreateSection(Name.c_str(), false,
SectionKind::getReadOnly());
NewRomSec = new PIC16Section(NewSection);
ROSections.push_back(NewRomSec);
}
// Insert the GV into this ROM Section.
NewRomSec->Items.push_back(GV);
return NewRomSec->S_;
}