llvm-6502/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
2009-07-10 20:10:14 +00:00

449 lines
15 KiB
C++

//===-- PIC16TargetAsmInfo.cpp - PIC16 asm properties ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the PIC16TargetAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "PIC16TargetAsmInfo.h"
#include "PIC16TargetMachine.h"
#include "llvm/GlobalValue.h"
#include "llvm/GlobalVariable.h"
#include "llvm/DerivedTypes.h"
using namespace llvm;
PIC16TargetAsmInfo::
PIC16TargetAsmInfo(const PIC16TargetMachine &TM)
: TargetAsmInfo(TM) {
CommentString = ";";
GlobalPrefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
GlobalDirective = "\tglobal\t";
ExternDirective = "\textern\t";
Data8bitsDirective = " db ";
Data16bitsDirective = " dw ";
Data32bitsDirective = " dl ";
Data64bitsDirective = NULL;
RomData8bitsDirective = " dw ";
RomData16bitsDirective = " rom_di ";
RomData32bitsDirective = " rom_dl ";
ZeroDirective = NULL;
AsciiDirective = " dt ";
AscizDirective = NULL;
BSSSection_ = getNamedSection("udata.# UDATA",
SectionFlags::Writeable | SectionFlags::BSS);
ReadOnlySection = getNamedSection("romdata.# ROMDATA", SectionFlags::None);
DataSection = getNamedSection("idata.# IDATA", SectionFlags::Writeable);
SwitchToSectionDirective = "";
// Need because otherwise a .text symbol is emitted by DwarfWriter
// in BeginModule, and gpasm cribbs for that .text symbol.
TextSection = getUnnamedSection("", SectionFlags::Code);
PIC16Section *ROSection = new PIC16Section(getReadOnlySection());
ROSections.push_back(ROSection);
ExternalVarDecls = new PIC16Section(getNamedSection("ExternalVarDecls"));
ExternalVarDefs = new PIC16Section(getNamedSection("ExternalVarDefs"));
// Set it to false because we weed to generate c file name and not bc file
// name.
HasSingleParameterDotFile = false;
}
const char *PIC16TargetAsmInfo::getRomDirective(unsigned size) const
{
if (size == 8)
return RomData8bitsDirective;
else if (size == 16)
return RomData16bitsDirective;
else if (size == 32)
return RomData32bitsDirective;
else
return NULL;
}
const char *PIC16TargetAsmInfo::getASDirective(unsigned size,
unsigned AS) const {
if (AS == PIC16ISD::ROM_SPACE)
return getRomDirective(size);
else
return NULL;
}
const Section *
PIC16TargetAsmInfo::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 Section *NewSection = getNamedSection (name.c_str());
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;
// We can't do this here because GV is const .
// const std::string SName = FoundBSS->S_->getName();
// GV->setSection(SName);
return FoundBSS->S_;
}
const Section *
PIC16TargetAsmInfo::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 Section *NewSection = getNamedSection (name.c_str());
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;
// We can't do this here because GV is const .
// GV->setSection(FoundIDATA->S->getName());
return FoundIDATA->S_;
}
// Get the section for an automatic variable of a function.
// For PIC16 they are globals only with mangled names.
const Section *
PIC16TargetAsmInfo::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 Section *NewSection = getNamedSection (name.c_str());
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 Section*
PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) 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 TargetAsmInfo::SelectSectionForGlobal(GV1);
// Record Exteranl 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.
const 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 TargetAsmInfo::SelectSectionForGlobal(GV);
}
PIC16TargetAsmInfo::~PIC16TargetAsmInfo() {
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;
}
// Override the default implementation. Create PIC16sections for variables
// which have a section name or address.
const Section*
PIC16TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
const Section* S;
// If GV has a sectin name or section address create that section now.
if (GV->hasSection()) {
std::string SectName = GV->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());
S = CreateSectionForGlobal(GV, SectAddr);
}
else {
S = CreateSectionForGlobal(GV);
}
} else {
// Use section depending on the 'type' of variable
S = SelectSectionForGlobal(GV);
}
return S;
}
// Create a new section for global variable. If Addr is given then create
// section at that address else create by name.
const Section *
PIC16TargetAsmInfo::CreateSectionForGlobal(const GlobalValue *GV1,
std::string Addr) const {
const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
if (!GV)
return TargetAsmInfo::SectionForGlobal(GV1);
// 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 TargetAsmInfo::SectionForGlobal(GV);
}
// Create uninitialized section for a variable.
const Section *
PIC16TargetAsmInfo::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->getName() + "." + Addr + ".";
Name = PAN::getUdataSectionName(BSSSections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewBSS = FoundBSS;
if (NewBSS == NULL) {
const Section *NewSection = getNamedSection (Name.c_str());
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 Section *
PIC16TargetAsmInfo::getROSectionForGlobal(const GlobalVariable *GV) const {
ROSections[0]->Items.push_back(GV);
return ROSections[0]->S_;
}
// Create initialized data section for a variable.
const Section *
PIC16TargetAsmInfo::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->getName() + "." + Addr + ".";
Name = PAN::getIdataSectionName(IDATASections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewIDATASec = FoundIDATASec;
if (NewIDATASec == NULL) {
const Section *NewSection = getNamedSection (Name.c_str());
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 Section *
PIC16TargetAsmInfo::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->getName() + "." + Addr + ".";
Name = PAN::getRomdataSectionName(ROSections.size(), Prefix) + " " + Addr;
}
PIC16Section *NewRomSec = FoundROSec;
if (NewRomSec == NULL) {
const Section *NewSection = getNamedSection (Name.c_str());
NewRomSec = new PIC16Section(NewSection);
ROSections.push_back(NewRomSec);
}
// Insert the GV into this ROM Section.
NewRomSec->Items.push_back(GV);
return NewRomSec->S_;
}