1 //===-- PIC16TargetObjectFile.cpp - PIC16 object files --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "PIC16TargetObjectFile.h"
11 #include "PIC16ISelLowering.h"
12 #include "PIC16TargetMachine.h"
13 #include "PIC16Section.h"
14 #include "llvm/DerivedTypes.h"
15 #include "llvm/Module.h"
16 #include "llvm/MC/MCSection.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/Support/raw_ostream.h"
22 PIC16TargetObjectFile::PIC16TargetObjectFile() {
25 PIC16TargetObjectFile::~PIC16TargetObjectFile() {
28 /// Find a pic16 section. Return null if not found. Do not create one.
29 PIC16Section *PIC16TargetObjectFile::
30 findPIC16Section(const std::string &Name) {
31 /// Return if we have an already existing one.
32 PIC16Section *Entry = SectionsByName[Name];
40 /// Find a pic16 section. If not found, create one.
41 PIC16Section *PIC16TargetObjectFile::
42 getPIC16Section(const std::string &Name, PIC16SectionType Ty,
43 const std::string &Address, int Color) const {
45 /// Return if we have an already existing one.
46 PIC16Section *&Entry = SectionsByName[Name];
51 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
55 /// Find a standard pic16 data section. If not found, create one and keep
56 /// track of it by adding it to appropriate std section list.
57 PIC16Section *PIC16TargetObjectFile::
58 getPIC16DataSection(const std::string &Name, PIC16SectionType Ty,
59 const std::string &Address, int Color) const {
61 /// Return if we have an already existing one.
62 PIC16Section *&Entry = SectionsByName[Name];
67 /// Else create a new one and add it to appropriate section list.
68 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
71 default: llvm_unreachable ("unknow standard section type.");
72 case UDATA: UDATASections_.push_back(Entry); break;
73 case IDATA: IDATASections_.push_back(Entry); break;
74 case ROMDATA: ROMDATASection_ = Entry; break;
75 case UDATA_SHR: SHAREDUDATASection_ = Entry; break;
82 /// Find a standard pic16 autos section. If not found, create one and keep
83 /// track of it by adding it to appropriate std section list.
84 PIC16Section *PIC16TargetObjectFile::
85 getPIC16AutoSection(const std::string &Name, PIC16SectionType Ty,
86 const std::string &Address, int Color) const {
88 /// Return if we have an already existing one.
89 PIC16Section *&Entry = SectionsByName[Name];
94 /// Else create a new one and add it to appropriate section list.
95 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
97 assert (Ty == UDATA_OVR && "incorrect section type for autos");
98 AUTOSections_.push_back(Entry);
103 /// Find a pic16 user section. If not found, create one and keep
104 /// track of it by adding it to appropriate std section list.
105 PIC16Section *PIC16TargetObjectFile::
106 getPIC16UserSection(const std::string &Name, PIC16SectionType Ty,
107 const std::string &Address, int Color) const {
109 /// Return if we have an already existing one.
110 PIC16Section *&Entry = SectionsByName[Name];
115 /// Else create a new one and add it to appropriate section list.
116 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
118 USERSections_.push_back(Entry);
123 /// Do some standard initialization.
124 void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
125 TargetLoweringObjectFile::Initialize(Ctx, tm);
128 ROMDATASection_ = NULL;
129 SHAREDUDATASection_ = NULL;
132 /// allocateUDATA - Allocate a un-initialized global to an existing or new UDATA
133 /// section and return that section.
135 PIC16TargetObjectFile::allocateUDATA(const GlobalVariable *GV) const {
136 assert(GV->hasInitializer() && "This global doesn't need space");
137 Constant *C = GV->getInitializer();
138 assert(C->isNullValue() && "Unitialized globals has non-zero initializer");
140 // Find how much space this global needs.
141 const TargetData *TD = TM->getTargetData();
142 const Type *Ty = C->getType();
143 unsigned ValSize = TD->getTypeAllocSize(Ty);
145 // Go through all UDATA Sections and assign this variable
146 // to the first available section having enough space.
147 PIC16Section *Found = NULL;
148 for (unsigned i = 0; i < UDATASections_.size(); i++) {
149 if (DataBankSize - UDATASections_[i]->getSize() >= ValSize) {
150 Found = UDATASections_[i];
155 // No UDATA section spacious enough was found. Crate a new one.
157 std::string name = PAN::getUdataSectionName(UDATASections_.size());
158 Found = getPIC16DataSection(name.c_str(), UDATA);
161 // Insert the GV into this UDATA section.
162 Found->Items.push_back(GV);
163 Found->setSize(Found->getSize() + ValSize);
167 /// allocateIDATA - allocate an initialized global into an existing
168 /// or new section and return that section.
170 PIC16TargetObjectFile::allocateIDATA(const GlobalVariable *GV) const{
171 assert(GV->hasInitializer() && "This global doesn't need space");
172 Constant *C = GV->getInitializer();
173 assert(!C->isNullValue() && "initialized globals has zero initializer");
174 assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
175 "can allocate initialized RAM data only");
177 // Find how much space this global needs.
178 const TargetData *TD = TM->getTargetData();
179 const Type *Ty = C->getType();
180 unsigned ValSize = TD->getTypeAllocSize(Ty);
182 // Go through all IDATA Sections and assign this variable
183 // to the first available section having enough space.
184 PIC16Section *Found = NULL;
185 for (unsigned i = 0; i < IDATASections_.size(); i++) {
186 if (DataBankSize - IDATASections_[i]->getSize() >= ValSize) {
187 Found = IDATASections_[i];
192 // No IDATA section spacious enough was found. Crate a new one.
194 std::string name = PAN::getIdataSectionName(IDATASections_.size());
195 Found = getPIC16DataSection(name.c_str(), IDATA);
198 // Insert the GV into this IDATA.
199 Found->Items.push_back(GV);
200 Found->setSize(Found->getSize() + ValSize);
204 // Allocate a program memory variable into ROMDATA section.
206 PIC16TargetObjectFile::allocateROMDATA(const GlobalVariable *GV) const {
208 std::string name = PAN::getRomdataSectionName();
209 PIC16Section *S = getPIC16DataSection(name.c_str(), ROMDATA);
211 S->Items.push_back(GV);
215 // Get the section for an automatic variable of a function.
216 // For PIC16 they are globals only with mangled names.
218 PIC16TargetObjectFile::allocateAUTO(const GlobalVariable *GV) const {
220 const std::string name = PAN::getSectionNameForSym(GV->getName());
221 PIC16Section *S = getPIC16AutoSection(name.c_str());
223 S->Items.push_back(GV);
228 // Override default implementation to put the true globals into
229 // multiple data sections if required.
231 PIC16TargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV1,
234 const TargetMachine &TM) const {
235 // We select the section based on the initializer here, so it really
236 // has to be a GlobalVariable.
237 const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
239 return TargetLoweringObjectFile::SelectSectionForGlobal(GV1, Kind, Mang,TM);
241 assert(GV->hasInitializer() && "A def without initializer?");
243 // First, if this is an automatic variable for a function, get the section
244 // name for it and return.
245 std::string name = GV->getName();
246 if (PAN::isLocalName(name))
247 return allocateAUTO(GV);
249 // See if this is an uninitialized global.
250 const Constant *C = GV->getInitializer();
251 if (C->isNullValue())
252 return allocateUDATA(GV);
254 // If this is initialized data in RAM. Put it in the correct IDATA section.
255 if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
256 return allocateIDATA(GV);
258 // This is initialized data in rom, put it in the readonly section.
259 if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
260 return allocateROMDATA(GV);
262 // Else let the default implementation take care of it.
263 return TargetLoweringObjectFile::SelectSectionForGlobal(GV, Kind, Mang,TM);
269 /// getExplicitSectionGlobal - Allow the target to completely override
270 /// section assignment of a global.
271 const MCSection *PIC16TargetObjectFile::
272 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
273 Mangler *Mang, const TargetMachine &TM) const {
274 assert(GV->hasSection());
276 if (const GlobalVariable *GVar = cast<GlobalVariable>(GV)) {
277 std::string SectName = GVar->getSection();
278 // If address for a variable is specified, get the address and create
280 // FIXME: move this attribute checking in PAN.
281 std::string AddrStr = "Address=";
282 if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
283 std::string SectAddr = SectName.substr(AddrStr.length());
284 if (SectAddr.compare("NEAR") == 0)
285 return allocateSHARED(GVar, Mang);
287 return allocateAtGivenAddress(GVar, SectAddr);
290 // Create the section specified with section attribute.
291 return allocateInGivenSection(GVar);
294 return getPIC16DataSection(GV->getSection().c_str(), UDATA);
298 PIC16TargetObjectFile::allocateSHARED(const GlobalVariable *GV,
299 Mangler *Mang) const {
300 // Make sure that this is an uninitialized global.
301 assert(GV->hasInitializer() && "This global doesn't need space");
302 if (!GV->getInitializer()->isNullValue()) {
303 // FIXME: Generate a warning in this case that near qualifier will be
305 return SelectSectionForGlobal(GV, SectionKind::getDataRel(), Mang, *TM);
307 std::string Name = PAN::getSharedUDataSectionName();
309 PIC16Section *SharedUDataSect = getPIC16DataSection(Name.c_str(), UDATA_SHR);
310 // Insert the GV into shared section.
311 SharedUDataSect->Items.push_back(GV);
312 return SharedUDataSect;
316 // Interface used by AsmPrinter to get a code section for a function.
318 PIC16TargetObjectFile::SectionForCode(const std::string &FnName) const {
319 const std::string &sec_name = PAN::getCodeSectionName(FnName);
320 return getPIC16Section(sec_name, CODE);
323 // Interface used by AsmPrinter to get a frame section for a function.
325 PIC16TargetObjectFile::SectionForFrame(const std::string &FnName) const {
326 const std::string &sec_name = PAN::getFrameSectionName(FnName);
327 return getPIC16Section(sec_name, UDATA_OVR);
330 // Allocate a global var in existing or new section of given name.
332 PIC16TargetObjectFile::allocateInGivenSection(const GlobalVariable *GV) const {
333 // Determine the type of section that we need to create.
334 PIC16SectionType SecTy;
336 // See if this is an uninitialized global.
337 const Constant *C = GV->getInitializer();
338 if (C->isNullValue())
340 // If this is initialized data in RAM. Put it in the correct IDATA section.
341 else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
343 // This is initialized data in rom, put it in the readonly section.
344 else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
347 llvm_unreachable ("Could not determine section type for global");
349 PIC16Section *S = getPIC16UserSection(GV->getSection().c_str(), SecTy);
350 S->Items.push_back(GV);
354 // Allocate a global var in a new absolute sections at given address.
356 PIC16TargetObjectFile::allocateAtGivenAddress(const GlobalVariable *GV,
357 const std::string &Addr) const {
358 // Determine the type of section that we need to create.
359 PIC16SectionType SecTy;
361 // See if this is an uninitialized global.
362 const Constant *C = GV->getInitializer();
363 if (C->isNullValue())
365 // If this is initialized data in RAM. Put it in the correct IDATA section.
366 else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
368 // This is initialized data in rom, put it in the readonly section.
369 else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
372 llvm_unreachable ("Could not determine section type for global");
374 std::string Prefix = GV->getNameStr() + "." + Addr + ".";
375 std::string SName = PAN::getUserSectionName(Prefix);
376 PIC16Section *S = getPIC16UserSection(SName.c_str(), SecTy, Addr.c_str());
377 S->Items.push_back(GV);