#include "PIC16TargetAsmInfo.h"
#include "PIC16TargetMachine.h"
#include "llvm/GlobalValue.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/DerivedTypes.h"
using namespace llvm;
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 ";
// 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
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_;
+}
+
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