llvm-6502/lib/Target/PIC16/PIC16TargetObjectFile.cpp
Sanjiv Gupta 7643ca5c2b The code section for an ISR has a specific address.
Currently, whether a function is ISR or not is encoded in the section attribute for that function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96322 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-16 03:41:07 +00:00

386 lines
13 KiB
C++

//===-- 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 "PIC16Section.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
PIC16TargetObjectFile::PIC16TargetObjectFile() {
}
PIC16TargetObjectFile::~PIC16TargetObjectFile() {
}
/// Find a pic16 section. Return null if not found. Do not create one.
PIC16Section *PIC16TargetObjectFile::
findPIC16Section(const std::string &Name) {
/// Return if we have an already existing one.
PIC16Section *Entry = SectionsByName[Name];
if (Entry)
return Entry;
return NULL;
}
/// Find a pic16 section. If not found, create one.
PIC16Section *PIC16TargetObjectFile::
getPIC16Section(const std::string &Name, PIC16SectionType Ty,
const std::string &Address, int Color) const {
/// Return if we have an already existing one.
PIC16Section *&Entry = SectionsByName[Name];
if (Entry)
return Entry;
Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
return Entry;
}
/// Find a standard pic16 data section. If not found, create one and keep
/// track of it by adding it to appropriate std section list.
PIC16Section *PIC16TargetObjectFile::
getPIC16DataSection(const std::string &Name, PIC16SectionType Ty,
const std::string &Address, int Color) const {
/// Return if we have an already existing one.
PIC16Section *&Entry = SectionsByName[Name];
if (Entry)
return Entry;
/// Else create a new one and add it to appropriate section list.
Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
switch (Ty) {
default: llvm_unreachable ("unknow standard section type.");
case UDATA: UDATASections_.push_back(Entry); break;
case IDATA: IDATASections_.push_back(Entry); break;
case ROMDATA: ROMDATASection_ = Entry; break;
case UDATA_SHR: SHAREDUDATASection_ = Entry; break;
}
return Entry;
}
/// Find a standard pic16 autos section. If not found, create one and keep
/// track of it by adding it to appropriate std section list.
PIC16Section *PIC16TargetObjectFile::
getPIC16AutoSection(const std::string &Name, PIC16SectionType Ty,
const std::string &Address, int Color) const {
/// Return if we have an already existing one.
PIC16Section *&Entry = SectionsByName[Name];
if (Entry)
return Entry;
/// Else create a new one and add it to appropriate section list.
Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
assert (Ty == UDATA_OVR && "incorrect section type for autos");
AUTOSections_.push_back(Entry);
return Entry;
}
/// Find a pic16 user section. If not found, create one and keep
/// track of it by adding it to appropriate std section list.
PIC16Section *PIC16TargetObjectFile::
getPIC16UserSection(const std::string &Name, PIC16SectionType Ty,
const std::string &Address, int Color) const {
/// Return if we have an already existing one.
PIC16Section *&Entry = SectionsByName[Name];
if (Entry)
return Entry;
/// Else create a new one and add it to appropriate section list.
Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
USERSections_.push_back(Entry);
return Entry;
}
/// Do some standard initialization.
void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
TargetLoweringObjectFile::Initialize(Ctx, tm);
TM = &tm;
ROMDATASection_ = NULL;
SHAREDUDATASection_ = NULL;
}
/// allocateUDATA - Allocate a un-initialized global to an existing or new UDATA
/// section and return that section.
const MCSection *
PIC16TargetObjectFile::allocateUDATA(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 UDATA Sections and assign this variable
// to the first available section having enough space.
PIC16Section *Found = NULL;
for (unsigned i = 0; i < UDATASections_.size(); i++) {
if (DataBankSize - UDATASections_[i]->getSize() >= ValSize) {
Found = UDATASections_[i];
break;
}
}
// No UDATA section spacious enough was found. Crate a new one.
if (!Found) {
std::string name = PAN::getUdataSectionName(UDATASections_.size());
Found = getPIC16DataSection(name.c_str(), UDATA);
}
// Insert the GV into this UDATA section.
Found->Items.push_back(GV);
Found->setSize(Found->getSize() + ValSize);
return Found;
}
/// allocateIDATA - allocate an initialized global into an existing
/// or new section and return that section.
const MCSection *
PIC16TargetObjectFile::allocateIDATA(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 allocate 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 *Found = NULL;
for (unsigned i = 0; i < IDATASections_.size(); i++) {
if (DataBankSize - IDATASections_[i]->getSize() >= ValSize) {
Found = IDATASections_[i];
break;
}
}
// No IDATA section spacious enough was found. Crate a new one.
if (!Found) {
std::string name = PAN::getIdataSectionName(IDATASections_.size());
Found = getPIC16DataSection(name.c_str(), IDATA);
}
// Insert the GV into this IDATA.
Found->Items.push_back(GV);
Found->setSize(Found->getSize() + ValSize);
return Found;
}
// Allocate a program memory variable into ROMDATA section.
const MCSection *
PIC16TargetObjectFile::allocateROMDATA(const GlobalVariable *GV) const {
std::string name = PAN::getRomdataSectionName();
PIC16Section *S = getPIC16DataSection(name.c_str(), ROMDATA);
S->Items.push_back(GV);
return S;
}
// Get the section for an automatic variable of a function.
// For PIC16 they are globals only with mangled names.
const MCSection *
PIC16TargetObjectFile::allocateAUTO(const GlobalVariable *GV) const {
const std::string name = PAN::getSectionNameForSym(GV->getName());
PIC16Section *S = getPIC16AutoSection(name.c_str());
S->Items.push_back(GV);
return 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);
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 allocateAUTO(GV);
// See if this is an uninitialized global.
const Constant *C = GV->getInitializer();
if (C->isNullValue())
return allocateUDATA(GV);
// If this is initialized data in RAM. Put it in the correct IDATA section.
if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
return allocateIDATA(GV);
// This is initialized data in rom, put it in the readonly section.
if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
return allocateROMDATA(GV);
// Else let the default implementation take care of it.
return TargetLoweringObjectFile::SelectSectionForGlobal(GV, Kind, Mang,TM);
}
/// getExplicitSectionGlobal - Allow the target to completely override
/// section assignment of a global.
const MCSection *PIC16TargetObjectFile::
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
assert(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.
// FIXME: move this attribute checking in PAN.
std::string AddrStr = "Address=";
if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
std::string SectAddr = SectName.substr(AddrStr.length());
if (SectAddr.compare("NEAR") == 0)
return allocateSHARED(GVar, Mang);
else
return allocateAtGivenAddress(GVar, SectAddr);
}
// Create the section specified with section attribute.
return allocateInGivenSection(GVar);
}
return getPIC16DataSection(GV->getSection().c_str(), UDATA);
}
const MCSection *
PIC16TargetObjectFile::allocateSHARED(const GlobalVariable *GV,
Mangler *Mang) const {
// Make sure that this is an uninitialized global.
assert(GV->hasInitializer() && "This global doesn't need space");
if (!GV->getInitializer()->isNullValue()) {
// FIXME: Generate a warning in this case that near qualifier will be
// ignored.
return SelectSectionForGlobal(GV, SectionKind::getDataRel(), Mang, *TM);
}
std::string Name = PAN::getSharedUDataSectionName();
PIC16Section *SharedUDataSect = getPIC16DataSection(Name.c_str(), UDATA_SHR);
// Insert the GV into shared section.
SharedUDataSect->Items.push_back(GV);
return SharedUDataSect;
}
// Interface used by AsmPrinter to get a code section for a function.
const PIC16Section *
PIC16TargetObjectFile::SectionForCode(const std::string &FnName,
bool isISR) const {
const std::string &sec_name = PAN::getCodeSectionName(FnName);
// If it is ISR, its code section starts at a specific address.
if (isISR)
return getPIC16Section(sec_name, CODE, PAN::getISRAddr());
return getPIC16Section(sec_name, CODE);
}
// Interface used by AsmPrinter to get a frame section for a function.
const PIC16Section *
PIC16TargetObjectFile::SectionForFrame(const std::string &FnName) const {
const std::string &sec_name = PAN::getFrameSectionName(FnName);
return getPIC16Section(sec_name, UDATA_OVR);
}
// Allocate a global var in existing or new section of given name.
const MCSection *
PIC16TargetObjectFile::allocateInGivenSection(const GlobalVariable *GV) const {
// Determine the type of section that we need to create.
PIC16SectionType SecTy;
// See if this is an uninitialized global.
const Constant *C = GV->getInitializer();
if (C->isNullValue())
SecTy = UDATA;
// If this is initialized data in RAM. Put it in the correct IDATA section.
else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
SecTy = IDATA;
// This is initialized data in rom, put it in the readonly section.
else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
SecTy = ROMDATA;
else
llvm_unreachable ("Could not determine section type for global");
PIC16Section *S = getPIC16UserSection(GV->getSection().c_str(), SecTy);
S->Items.push_back(GV);
return S;
}
// Allocate a global var in a new absolute sections at given address.
const MCSection *
PIC16TargetObjectFile::allocateAtGivenAddress(const GlobalVariable *GV,
const std::string &Addr) const {
// Determine the type of section that we need to create.
PIC16SectionType SecTy;
// See if this is an uninitialized global.
const Constant *C = GV->getInitializer();
if (C->isNullValue())
SecTy = UDATA;
// If this is initialized data in RAM. Put it in the correct IDATA section.
else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
SecTy = IDATA;
// This is initialized data in rom, put it in the readonly section.
else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
SecTy = ROMDATA;
else
llvm_unreachable ("Could not determine section type for global");
std::string Prefix = GV->getNameStr() + "." + Addr + ".";
std::string SName = PAN::getUserSectionName(Prefix);
PIC16Section *S = getPIC16UserSection(SName.c_str(), SecTy, Addr.c_str());
S->Items.push_back(GV);
return S;
}