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;
81 /// Find a standard pic16 autos section. If not found, create one and keep
82 /// track of it by adding it to appropriate std section list.
83 PIC16Section *PIC16TargetObjectFile::
84 getPIC16AutoSection(const std::string &Name, PIC16SectionType Ty,
85 const std::string &Address, int Color) const {
87 /// Return if we have an already existing one.
88 PIC16Section *&Entry = SectionsByName[Name];
93 /// Else create a new one and add it to appropriate section list.
94 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
96 assert (Ty == UDATA_OVR && "incorrect section type for autos");
97 AUTOSections_.push_back(Entry);
102 /// Find a pic16 user section. If not found, create one and keep
103 /// track of it by adding it to appropriate std section list.
104 PIC16Section *PIC16TargetObjectFile::
105 getPIC16UserSection(const std::string &Name, PIC16SectionType Ty,
106 const std::string &Address, int Color) const {
108 /// Return if we have an already existing one.
109 PIC16Section *&Entry = SectionsByName[Name];
114 /// Else create a new one and add it to appropriate section list.
115 Entry = PIC16Section::Create(Name, Ty, Address, Color, getContext());
117 USERSections_.push_back(Entry);
122 /// Do some standard initialization.
123 void PIC16TargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &tm){
124 TargetLoweringObjectFile::Initialize(Ctx, tm);
127 ROMDATASection_ = NULL;
130 /// allocateUDATA - Allocate a un-initialized global to an existing or new UDATA
131 /// section and return that section.
133 PIC16TargetObjectFile::allocateUDATA(const GlobalVariable *GV) const {
134 assert(GV->hasInitializer() && "This global doesn't need space");
135 Constant *C = GV->getInitializer();
136 assert(C->isNullValue() && "Unitialized globals has non-zero initializer");
138 // Find how much space this global needs.
139 const TargetData *TD = TM->getTargetData();
140 const Type *Ty = C->getType();
141 unsigned ValSize = TD->getTypeAllocSize(Ty);
143 // Go through all UDATA Sections and assign this variable
144 // to the first available section having enough space.
145 PIC16Section *Found = NULL;
146 for (unsigned i = 0; i < UDATASections_.size(); i++) {
147 if (DataBankSize - UDATASections_[i]->getSize() >= ValSize) {
148 Found = UDATASections_[i];
153 // No UDATA section spacious enough was found. Crate a new one.
155 std::string name = PAN::getUdataSectionName(UDATASections_.size());
156 Found = getPIC16DataSection(name.c_str(), UDATA);
159 // Insert the GV into this UDATA section.
160 Found->Items.push_back(GV);
161 Found->setSize(Found->getSize() + ValSize);
165 /// allocateIDATA - allocate an initialized global into an existing
166 /// or new section and return that section.
168 PIC16TargetObjectFile::allocateIDATA(const GlobalVariable *GV) const{
169 assert(GV->hasInitializer() && "This global doesn't need space");
170 Constant *C = GV->getInitializer();
171 assert(!C->isNullValue() && "initialized globals has zero initializer");
172 assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
173 "can allocate initialized RAM data only");
175 // Find how much space this global needs.
176 const TargetData *TD = TM->getTargetData();
177 const Type *Ty = C->getType();
178 unsigned ValSize = TD->getTypeAllocSize(Ty);
180 // Go through all IDATA Sections and assign this variable
181 // to the first available section having enough space.
182 PIC16Section *Found = NULL;
183 for (unsigned i = 0; i < IDATASections_.size(); i++) {
184 if (DataBankSize - IDATASections_[i]->getSize() >= ValSize) {
185 Found = IDATASections_[i];
190 // No IDATA section spacious enough was found. Crate a new one.
192 std::string name = PAN::getIdataSectionName(IDATASections_.size());
193 Found = getPIC16DataSection(name.c_str(), IDATA);
196 // Insert the GV into this IDATA.
197 Found->Items.push_back(GV);
198 Found->setSize(Found->getSize() + ValSize);
202 // Allocate a program memory variable into ROMDATA section.
204 PIC16TargetObjectFile::allocateROMDATA(const GlobalVariable *GV) const {
206 std::string name = PAN::getRomdataSectionName();
207 PIC16Section *S = getPIC16DataSection(name.c_str(), ROMDATA);
209 S->Items.push_back(GV);
213 // Get the section for an automatic variable of a function.
214 // For PIC16 they are globals only with mangled names.
216 PIC16TargetObjectFile::allocateAUTO(const GlobalVariable *GV) const {
218 const std::string name = PAN::getSectionNameForSym(GV->getName());
219 PIC16Section *S = getPIC16AutoSection(name.c_str());
221 S->Items.push_back(GV);
226 // Override default implementation to put the true globals into
227 // multiple data sections if required.
229 PIC16TargetObjectFile::SelectSectionForGlobal(const GlobalValue *GV1,
232 const TargetMachine &TM) const {
233 // We select the section based on the initializer here, so it really
234 // has to be a GlobalVariable.
235 const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
237 return TargetLoweringObjectFile::SelectSectionForGlobal(GV1, Kind, Mang,TM);
239 assert(GV->hasInitializer() && "A def without initializer?");
241 // First, if this is an automatic variable for a function, get the section
242 // name for it and return.
243 std::string name = GV->getName();
244 if (PAN::isLocalName(name))
245 return allocateAUTO(GV);
247 // See if this is an uninitialized global.
248 const Constant *C = GV->getInitializer();
249 if (C->isNullValue())
250 return allocateUDATA(GV);
252 // If this is initialized data in RAM. Put it in the correct IDATA section.
253 if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
254 return allocateIDATA(GV);
256 // This is initialized data in rom, put it in the readonly section.
257 if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
258 return allocateROMDATA(GV);
260 // Else let the default implementation take care of it.
261 return TargetLoweringObjectFile::SelectSectionForGlobal(GV, Kind, Mang,TM);
267 /// getExplicitSectionGlobal - Allow the target to completely override
268 /// section assignment of a global.
269 const MCSection *PIC16TargetObjectFile::
270 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
271 Mangler *Mang, const TargetMachine &TM) const {
272 assert(GV->hasSection());
274 if (const GlobalVariable *GVar = cast<GlobalVariable>(GV)) {
275 std::string SectName = GVar->getSection();
276 // If address for a variable is specified, get the address and create
278 // FIXME: move this attribute checking in PAN.
279 std::string AddrStr = "Address=";
280 if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
281 std::string SectAddr = SectName.substr(AddrStr.length());
282 return allocateAtGivenAddress(GVar, SectAddr);
285 // Create the section specified with section attribute.
286 return allocateInGivenSection(GVar);
289 return getPIC16DataSection(GV->getSection().c_str(), UDATA);
292 // Interface used by AsmPrinter to get a code section for a function.
294 PIC16TargetObjectFile::SectionForCode(const std::string &FnName) const {
295 const std::string &sec_name = PAN::getCodeSectionName(FnName);
296 return getPIC16Section(sec_name, CODE);
299 // Interface used by AsmPrinter to get a frame section for a function.
301 PIC16TargetObjectFile::SectionForFrame(const std::string &FnName) const {
302 const std::string &sec_name = PAN::getFrameSectionName(FnName);
303 return getPIC16Section(sec_name, UDATA_OVR);
306 // Allocate a global var in existing or new section of given name.
308 PIC16TargetObjectFile::allocateInGivenSection(const GlobalVariable *GV) const {
309 // Determine the type of section that we need to create.
310 PIC16SectionType SecTy;
312 // See if this is an uninitialized global.
313 const Constant *C = GV->getInitializer();
314 if (C->isNullValue())
316 // If this is initialized data in RAM. Put it in the correct IDATA section.
317 else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
319 // This is initialized data in rom, put it in the readonly section.
320 else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
323 llvm_unreachable ("Could not determine section type for global");
325 PIC16Section *S = getPIC16UserSection(GV->getSection().c_str(), SecTy);
326 S->Items.push_back(GV);
330 // Allocate a global var in a new absolute sections at given address.
332 PIC16TargetObjectFile::allocateAtGivenAddress(const GlobalVariable *GV,
333 const std::string &Addr) const {
334 // Determine the type of section that we need to create.
335 PIC16SectionType SecTy;
337 // See if this is an uninitialized global.
338 const Constant *C = GV->getInitializer();
339 if (C->isNullValue())
341 // If this is initialized data in RAM. Put it in the correct IDATA section.
342 else if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
344 // This is initialized data in rom, put it in the readonly section.
345 else if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
348 llvm_unreachable ("Could not determine section type for global");
350 std::string Prefix = GV->getNameStr() + "." + Addr + ".";
351 std::string SName = PAN::getUserSectionName(Prefix);
352 PIC16Section *S = getPIC16UserSection(SName.c_str(), SecTy, Addr.c_str());
353 S->Items.push_back(GV);