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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
386 lines
13 KiB
C++
386 lines
13 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 "PIC16ISelLowering.h"
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#include "PIC16TargetMachine.h"
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#include "PIC16Section.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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PIC16TargetObjectFile::PIC16TargetObjectFile() {
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}
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PIC16TargetObjectFile::~PIC16TargetObjectFile() {
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}
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/// Find a pic16 section. Return null if not found. Do not create one.
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PIC16Section *PIC16TargetObjectFile::
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findPIC16Section(const std::string &Name) {
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/// Return if we have an already existing one.
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PIC16Section *Entry = SectionsByName[Name];
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if (Entry)
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return Entry;
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return NULL;
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}
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/// Find a pic16 section. If not found, create one.
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PIC16Section *PIC16TargetObjectFile::
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getPIC16Section(const std::string &Name, PIC16SectionType Ty,
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const std::string &Address, int Color) const {
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/// Return if we have an already existing one.
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PIC16Section *&Entry = SectionsByName[Name];
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if (Entry)
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return Entry;
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Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
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return Entry;
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}
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/// Find a standard pic16 data section. If not found, create one and keep
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/// track of it by adding it to appropriate std section list.
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PIC16Section *PIC16TargetObjectFile::
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getPIC16DataSection(const std::string &Name, PIC16SectionType Ty,
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const std::string &Address, int Color) const {
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/// Return if we have an already existing one.
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PIC16Section *&Entry = SectionsByName[Name];
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if (Entry)
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return Entry;
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/// Else create a new one and add it to appropriate section list.
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Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
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switch (Ty) {
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default: llvm_unreachable ("unknow standard section type.");
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case UDATA: UDATASections_.push_back(Entry); break;
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case IDATA: IDATASections_.push_back(Entry); break;
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case ROMDATA: ROMDATASection_ = Entry; break;
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case UDATA_SHR: SHAREDUDATASection_ = Entry; break;
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}
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return Entry;
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}
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/// Find a standard pic16 autos section. If not found, create one and keep
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/// track of it by adding it to appropriate std section list.
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PIC16Section *PIC16TargetObjectFile::
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getPIC16AutoSection(const std::string &Name, PIC16SectionType Ty,
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const std::string &Address, int Color) const {
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/// Return if we have an already existing one.
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PIC16Section *&Entry = SectionsByName[Name];
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if (Entry)
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return Entry;
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/// Else create a new one and add it to appropriate section list.
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Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
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assert (Ty == UDATA_OVR && "incorrect section type for autos");
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AUTOSections_.push_back(Entry);
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return Entry;
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}
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/// Find a pic16 user section. If not found, create one and keep
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/// track of it by adding it to appropriate std section list.
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PIC16Section *PIC16TargetObjectFile::
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getPIC16UserSection(const std::string &Name, PIC16SectionType Ty,
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const std::string &Address, int Color) const {
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/// Return if we have an already existing one.
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PIC16Section *&Entry = SectionsByName[Name];
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if (Entry)
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return Entry;
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/// Else create a new one and add it to appropriate section list.
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Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
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USERSections_.push_back(Entry);
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return Entry;
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}
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/// Do some standard initialization.
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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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ROMDATASection_ = NULL;
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SHAREDUDATASection_ = NULL;
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}
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/// allocateUDATA - Allocate a un-initialized global to an existing or new UDATA
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/// section and return that section.
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const MCSection *
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PIC16TargetObjectFile::allocateUDATA(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 UDATA Sections and assign this variable
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// to the first available section having enough space.
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PIC16Section *Found = NULL;
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for (unsigned i = 0; i < UDATASections_.size(); i++) {
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if (DataBankSize - UDATASections_[i]->getSize() >= ValSize) {
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Found = UDATASections_[i];
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break;
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}
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}
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// No UDATA section spacious enough was found. Crate a new one.
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if (!Found) {
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std::string name = PAN::getUdataSectionName(UDATASections_.size());
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Found = getPIC16DataSection(name.c_str(), UDATA);
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}
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// Insert the GV into this UDATA section.
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Found->Items.push_back(GV);
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Found->setSize(Found->getSize() + ValSize);
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return Found;
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}
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/// allocateIDATA - allocate an initialized global into an existing
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/// or new section and return that section.
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const MCSection *
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PIC16TargetObjectFile::allocateIDATA(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 allocate 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 *Found = NULL;
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for (unsigned i = 0; i < IDATASections_.size(); i++) {
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if (DataBankSize - IDATASections_[i]->getSize() >= ValSize) {
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Found = 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 (!Found) {
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std::string name = PAN::getIdataSectionName(IDATASections_.size());
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Found = getPIC16DataSection(name.c_str(), IDATA);
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}
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// Insert the GV into this IDATA.
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Found->Items.push_back(GV);
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Found->setSize(Found->getSize() + ValSize);
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return Found;
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}
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// Allocate a program memory variable into ROMDATA section.
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const MCSection *
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PIC16TargetObjectFile::allocateROMDATA(const GlobalVariable *GV) const {
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std::string name = PAN::getRomdataSectionName();
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PIC16Section *S = getPIC16DataSection(name.c_str(), ROMDATA);
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S->Items.push_back(GV);
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return 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::allocateAUTO(const GlobalVariable *GV) const {
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const std::string name = PAN::getSectionNameForSym(GV->getName());
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PIC16Section *S = getPIC16AutoSection(name.c_str());
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S->Items.push_back(GV);
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return 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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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 allocateAUTO(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 allocateUDATA(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 allocateIDATA(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 allocateROMDATA(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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/// getExplicitSectionGlobal - 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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// FIXME: move this attribute checking in PAN.
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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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if (SectAddr.compare("NEAR") == 0)
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return allocateSHARED(GVar, Mang);
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else
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return allocateAtGivenAddress(GVar, SectAddr);
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}
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// Create the section specified with section attribute.
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return allocateInGivenSection(GVar);
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}
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return getPIC16DataSection(GV->getSection().c_str(), UDATA);
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}
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const MCSection *
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PIC16TargetObjectFile::allocateSHARED(const GlobalVariable *GV,
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Mangler *Mang) const {
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// Make sure that this is an uninitialized global.
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assert(GV->hasInitializer() && "This global doesn't need space");
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if (!GV->getInitializer()->isNullValue()) {
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// FIXME: Generate a warning in this case that near qualifier will be
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// ignored.
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return SelectSectionForGlobal(GV, SectionKind::getDataRel(), Mang, *TM);
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}
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std::string Name = PAN::getSharedUDataSectionName();
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PIC16Section *SharedUDataSect = getPIC16DataSection(Name.c_str(), UDATA_SHR);
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// Insert the GV into shared section.
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SharedUDataSect->Items.push_back(GV);
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return SharedUDataSect;
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}
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// Interface used by AsmPrinter to get a code section for a function.
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const PIC16Section *
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PIC16TargetObjectFile::SectionForCode(const std::string &FnName,
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bool isISR) const {
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const std::string &sec_name = PAN::getCodeSectionName(FnName);
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// If it is ISR, its code section starts at a specific address.
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if (isISR)
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return getPIC16Section(sec_name, CODE, PAN::getISRAddr());
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return getPIC16Section(sec_name, CODE);
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}
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// Interface used by AsmPrinter to get a frame section for a function.
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const PIC16Section *
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PIC16TargetObjectFile::SectionForFrame(const std::string &FnName) const {
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const std::string &sec_name = PAN::getFrameSectionName(FnName);
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return getPIC16Section(sec_name, UDATA_OVR);
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}
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// Allocate a global var in existing or new section of given name.
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const MCSection *
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PIC16TargetObjectFile::allocateInGivenSection(const GlobalVariable *GV) const {
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// Determine the type of section that we need to create.
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PIC16SectionType SecTy;
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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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SecTy = UDATA;
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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SecTy = IDATA;
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// This is initialized data in rom, put it in the readonly section.
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else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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SecTy = ROMDATA;
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else
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llvm_unreachable ("Could not determine section type for global");
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PIC16Section *S = getPIC16UserSection(GV->getSection().c_str(), SecTy);
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S->Items.push_back(GV);
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return S;
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}
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// Allocate a global var in a new absolute sections at given address.
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const MCSection *
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PIC16TargetObjectFile::allocateAtGivenAddress(const GlobalVariable *GV,
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const std::string &Addr) const {
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// Determine the type of section that we need to create.
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PIC16SectionType SecTy;
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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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SecTy = UDATA;
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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SecTy = IDATA;
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// This is initialized data in rom, put it in the readonly section.
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else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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SecTy = ROMDATA;
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else
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llvm_unreachable ("Could not determine section type for global");
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std::string Prefix = GV->getNameStr() + "." + Addr + ".";
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std::string SName = PAN::getUserSectionName(Prefix);
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PIC16Section *S = getPIC16UserSection(SName.c_str(), SecTy, Addr.c_str());
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S->Items.push_back(GV);
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return S;
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}
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