1 //===-- PIC16TargetAsmInfo.cpp - PIC16 asm properties ---------------------===//
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 // This file contains the declarations of the PIC16TargetAsmInfo properties.
12 //===----------------------------------------------------------------------===//
14 #include "PIC16TargetAsmInfo.h"
15 #include "PIC16TargetMachine.h"
16 #include "llvm/GlobalValue.h"
17 #include "llvm/GlobalVariable.h"
18 #include "llvm/DerivedTypes.h"
23 PIC16TargetAsmInfo(const PIC16TargetMachine &TM)
26 GlobalPrefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
27 GlobalDirective = "\tglobal\t";
28 ExternDirective = "\textern\t";
30 Data8bitsDirective = " db ";
31 Data16bitsDirective = " dw ";
32 Data32bitsDirective = " dl ";
33 RomData8bitsDirective = " dw ";
34 RomData16bitsDirective = " rom_di ";
35 RomData32bitsDirective = " rom_dl ";
37 AsciiDirective = " dt ";
38 AscizDirective = NULL;
39 BSSSection_ = getNamedSection("udata.# UDATA",
40 SectionFlags::Writeable | SectionFlags::BSS);
41 ReadOnlySection = getNamedSection("romdata.# ROMDATA", SectionFlags::None);
42 DataSection = getNamedSection("idata.# IDATA", SectionFlags::Writeable);
43 SwitchToSectionDirective = "";
44 // Need because otherwise a .text symbol is emitted by DwarfWriter
45 // in BeginModule, and gpasm cribbs for that .text symbol.
46 TextSection = getUnnamedSection("", SectionFlags::Code);
47 ROSection = new PIC16Section(getReadOnlySection());
48 ExternalVarDecls = new PIC16Section(getNamedSection("ExternalVarDecls"));
49 ExternalVarDefs = new PIC16Section(getNamedSection("ExternalVarDefs"));
50 // Set it to false because we weed to generate c file name and not bc file
52 HasSingleParameterDotFile = false;
55 const char *PIC16TargetAsmInfo::getRomDirective(unsigned size) const
58 return RomData8bitsDirective;
60 return RomData16bitsDirective;
62 return RomData32bitsDirective;
68 const char *PIC16TargetAsmInfo::getASDirective(unsigned size,
70 if (AS == PIC16ISD::ROM_SPACE)
71 return getRomDirective(size);
77 PIC16TargetAsmInfo::getBSSSectionForGlobal(const GlobalVariable *GV) const {
78 assert (GV->hasInitializer() && "This global doesn't need space");
79 Constant *C = GV->getInitializer();
80 assert (C->isNullValue() && "Unitialized globals has non-zero initializer");
82 // Find how much space this global needs.
83 const TargetData *TD = TM.getTargetData();
84 const Type *Ty = C->getType();
85 unsigned ValSize = TD->getTypeAllocSize(Ty);
87 // Go through all BSS Sections and assign this variable
88 // to the first available section having enough space.
89 PIC16Section *FoundBSS = NULL;
90 for (unsigned i = 0; i < BSSSections.size(); i++) {
91 if (DataBankSize - BSSSections[i]->Size >= ValSize) {
92 FoundBSS = BSSSections[i];
97 // No BSS section spacious enough was found. Crate a new one.
99 std::string name = PAN::getUdataSectionName(BSSSections.size());
100 const Section *NewSection = getNamedSection (name.c_str());
102 FoundBSS = new PIC16Section(NewSection);
104 // Add this newly created BSS section to the list of BSSSections.
105 BSSSections.push_back(FoundBSS);
108 // Insert the GV into this BSS.
109 FoundBSS->Items.push_back(GV);
110 FoundBSS->Size += ValSize;
112 // We can't do this here because GV is const .
113 // const std::string SName = FoundBSS->S_->getName();
114 // GV->setSection(SName);
120 PIC16TargetAsmInfo::getIDATASectionForGlobal(const GlobalVariable *GV) const {
121 assert (GV->hasInitializer() && "This global doesn't need space");
122 Constant *C = GV->getInitializer();
123 assert (!C->isNullValue() && "initialized globals has zero initializer");
124 assert (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
125 "can split initialized RAM data only");
127 // Find how much space this global needs.
128 const TargetData *TD = TM.getTargetData();
129 const Type *Ty = C->getType();
130 unsigned ValSize = TD->getTypeAllocSize(Ty);
132 // Go through all IDATA Sections and assign this variable
133 // to the first available section having enough space.
134 PIC16Section *FoundIDATA = NULL;
135 for (unsigned i = 0; i < IDATASections.size(); i++) {
136 if ( DataBankSize - IDATASections[i]->Size >= ValSize) {
137 FoundIDATA = IDATASections[i];
142 // No IDATA section spacious enough was found. Crate a new one.
144 std::string name = PAN::getIdataSectionName(IDATASections.size());
145 const Section *NewSection = getNamedSection (name.c_str());
147 FoundIDATA = new PIC16Section(NewSection);
149 // Add this newly created IDATA section to the list of IDATASections.
150 IDATASections.push_back(FoundIDATA);
153 // Insert the GV into this IDATA.
154 FoundIDATA->Items.push_back(GV);
155 FoundIDATA->Size += ValSize;
157 // We can't do this here because GV is const .
158 // GV->setSection(FoundIDATA->S->getName());
160 return FoundIDATA->S_;
163 // Get the section for an automatic variable of a function.
164 // For PIC16 they are globals only with mangled names.
166 PIC16TargetAsmInfo::getSectionForAuto(const GlobalVariable *GV) const {
168 const std::string name = PAN::getSectionNameForSym(GV->getName());
170 // Go through all Auto Sections and assign this variable
171 // to the appropriate section.
172 PIC16Section *FoundAutoSec = NULL;
173 for (unsigned i = 0; i < AutosSections.size(); i++) {
174 if ( AutosSections[i]->S_->getName() == name) {
175 FoundAutoSec = AutosSections[i];
180 // No Auto section was found. Crate a new one.
181 if (! FoundAutoSec) {
182 const Section *NewSection = getNamedSection (name.c_str());
184 FoundAutoSec = new PIC16Section(NewSection);
186 // Add this newly created autos section to the list of AutosSections.
187 AutosSections.push_back(FoundAutoSec);
190 // Insert the auto into this section.
191 FoundAutoSec->Items.push_back(GV);
193 return FoundAutoSec->S_;
197 // Override default implementation to put the true globals into
198 // multiple data sections if required.
200 PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) const {
201 // We select the section based on the initializer here, so it really
202 // has to be a GlobalVariable.
203 const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
206 return TargetAsmInfo::SelectSectionForGlobal(GV1);
208 // Record Exteranl Var Decls.
209 if (GV->isDeclaration()) {
210 ExternalVarDecls->Items.push_back(GV);
211 return ExternalVarDecls->S_;
214 assert (GV->hasInitializer() && "A def without initializer?");
216 // First, if this is an automatic variable for a function, get the section
217 // name for it and return.
218 const std::string name = GV->getName();
219 if (PAN::isLocalName(name)) {
220 return getSectionForAuto(GV);
223 // Record Exteranl Var Defs.
224 if (GV->hasExternalLinkage() || GV->hasCommonLinkage()) {
225 ExternalVarDefs->Items.push_back(GV);
228 // See if this is an uninitialized global.
229 const Constant *C = GV->getInitializer();
230 if (C->isNullValue())
231 return getBSSSectionForGlobal(GV);
233 // If this is initialized data in RAM. Put it in the correct IDATA section.
234 if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
235 return getIDATASectionForGlobal(GV);
237 // This is initialized data in rom, put it in the readonly section.
238 if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE) {
239 ROSection->Items.push_back(GV);
240 return ROSection->S_;
243 // Else let the default implementation take care of it.
244 return TargetAsmInfo::SelectSectionForGlobal(GV);
247 PIC16TargetAsmInfo::~PIC16TargetAsmInfo() {
249 for (unsigned i = 0; i < BSSSections.size(); i++) {
250 delete BSSSections[i];
253 for (unsigned i = 0; i < IDATASections.size(); i++) {
254 delete IDATASections[i];
257 for (unsigned i = 0; i < AutosSections.size(); i++) {
258 delete AutosSections[i];
262 delete ExternalVarDecls;
263 delete ExternalVarDefs;