1 files changed, 440 insertions, 0 deletions
diff --git a/lib/Target/PIC16/PIC16TargetObjectFile.cpp b/lib/Target/PIC16/PIC16TargetObjectFile.cpp
new file mode 100644
index 0000000..a2a4c09
--- /dev/null
+++ b/lib/Target/PIC16/PIC16TargetObjectFile.cpp
@@ -0,0 +1,440 @@
+//===-- 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 "MCSectionPIC16.h"
+#include "PIC16ISelLowering.h"
+#include "PIC16TargetMachine.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;
+
+
+MCSectionPIC16 *MCSectionPIC16::Create(const StringRef &Name, SectionKind K, 
+                                       int Address, int Color, MCContext &Ctx) {
+  return new (Ctx) MCSectionPIC16(Name, K, Address, Color);
+}
+
+
+void MCSectionPIC16::PrintSwitchToSection(const MCAsmInfo &MAI,
+                                          raw_ostream &OS) const {
+  OS << getName() << '\n';
+}
+
+
+
+
+PIC16TargetObjectFile::PIC16TargetObjectFile()
+  : ExternalVarDecls(0), ExternalVarDefs(0) {
+}
+
+const MCSectionPIC16 *PIC16TargetObjectFile::
+getPIC16Section(const char *Name, SectionKind Kind, 
+                int Address, int Color) const {
+  MCSectionPIC16 *&Entry = SectionsByName[Name];
+  if (Entry)
+    return Entry;
+
+  return Entry = MCSectionPIC16::Create(Name, Kind, Address, Color, 
+                                        getContext());
+}
+
+
+void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
+  TargetLoweringObjectFile::Initialize(Ctx, tm);
+  TM = &tm;
+  
+  BSSSection = getPIC16Section("udata.# UDATA", MCSectionPIC16::UDATA_Kind());
+  ReadOnlySection = getPIC16Section("romdata.# ROMDATA", 
+                                    MCSectionPIC16::ROMDATA_Kind());
+  DataSection = getPIC16Section("idata.# IDATA", MCSectionPIC16::IDATA_Kind());
+  
+  // Need because otherwise a .text symbol is emitted by DwarfWriter
+  // in BeginModule, and gpasm cribbs for that .text symbol.
+  TextSection = getPIC16Section("", SectionKind::getText());
+
+  ROSections.push_back(new PIC16Section((MCSectionPIC16*)ReadOnlySection));
+  
+  // FIXME: I don't know what the classification of these sections really is.
+  // These aren't really objects belonging to any section. Just emit them
+  // in AsmPrinter and remove this code from here. 
+  ExternalVarDecls = new PIC16Section(getPIC16Section("ExternalVarDecls",
+                                      SectionKind::getMetadata()));
+  ExternalVarDefs = new PIC16Section(getPIC16Section("ExternalVarDefs",
+                                      SectionKind::getMetadata()));
+}
+
+const MCSection *PIC16TargetObjectFile::
+getSectionForFunction(const std::string &FnName) const {
+  std::string T = PAN::getCodeSectionName(FnName);
+  return getPIC16Section(T.c_str(), SectionKind::getText());
+}
+
+
+const MCSection *PIC16TargetObjectFile::
+getSectionForFunctionFrame(const std::string &FnName) const {
+  std::string T = PAN::getFrameSectionName(FnName);
+  return getPIC16Section(T.c_str(), SectionKind::getDataRel());
+}
+
+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 MCSectionPIC16 *NewSection
+      = getPIC16Section(name.c_str(), MCSectionPIC16::UDATA_Kind());
+
+    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 MCSectionPIC16 *NewSection =
+      getPIC16Section(name.c_str(), MCSectionPIC16::IDATA_Kind());
+
+    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 MCSectionPIC16 *NewSection =
+      getPIC16Section(name.c_str(), MCSectionPIC16::UDATA_OVR_Kind());
+
+    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::
+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.
+    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 getPIC16Section(GV->getSection().c_str(), Kind);
+}
+
+// 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 MCSectionPIC16 *NewSection =
+      getPIC16Section(Name.c_str(), MCSectionPIC16::UDATA_Kind());
+    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 MCSectionPIC16 *NewSection =
+      getPIC16Section(Name.c_str(), MCSectionPIC16::IDATA_Kind());
+    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 MCSectionPIC16 *NewSection =
+      getPIC16Section(Name.c_str(), MCSectionPIC16::ROMDATA_Kind());
+    NewRomSec = new PIC16Section(NewSection);
+    ROSections.push_back(NewRomSec);
+  }
+
+  // Insert the GV into this ROM Section.
+  NewRomSec->Items.push_back(GV);
+  return NewRomSec->S_;
+}
+