1 //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
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 a printer that converts from our internal representation
11 // of machine-dependent LLVM code to the XAS-format XCore assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "XCoreInstrInfo.h"
18 #include "XCoreSubtarget.h"
19 #include "XCoreMCAsmInfo.h"
20 #include "XCoreTargetMachine.h"
21 #include "llvm/Constants.h"
22 #include "llvm/DerivedTypes.h"
23 #include "llvm/Module.h"
24 #include "llvm/CodeGen/AsmPrinter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/CodeGen/MachineJumpTableInfo.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSymbol.h"
32 #include "llvm/Target/Mangler.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetLoweringObjectFile.h"
35 #include "llvm/Target/TargetRegistry.h"
36 #include "llvm/ADT/SmallString.h"
37 #include "llvm/ADT/StringExtras.h"
38 #include "llvm/Support/CommandLine.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/raw_ostream.h"
45 static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
46 cl::desc("Maximum number of threads (for emulation thread-local storage)"),
48 cl::value_desc("number"),
52 class XCoreAsmPrinter : public AsmPrinter {
53 const XCoreSubtarget &Subtarget;
55 explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
56 : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()){}
58 virtual const char *getPassName() const {
59 return "XCore Assembly Printer";
62 void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
63 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
64 const std::string &directive = ".jmptable");
65 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
66 printInlineJT(MI, opNum, O, ".jmptable32");
68 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
69 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
70 unsigned AsmVariant, const char *ExtraCode,
73 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
74 virtual void EmitGlobalVariable(const GlobalVariable *GV);
76 void printInstruction(const MachineInstr *MI, raw_ostream &O); // autogen'd.
77 static const char *getRegisterName(unsigned RegNo);
79 void EmitFunctionEntryLabel();
80 void EmitInstruction(const MachineInstr *MI);
81 void EmitFunctionBodyEnd();
83 } // end of anonymous namespace
85 #include "XCoreGenAsmWriter.inc"
87 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
88 assert(((GV->hasExternalLinkage() ||
89 GV->hasWeakLinkage()) ||
90 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
91 if (const ArrayType *ATy = dyn_cast<ArrayType>(
92 cast<PointerType>(GV->getType())->getElementType())) {
93 OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
94 // FIXME: MCStreamerize.
95 OutStreamer.EmitRawText(StringRef(".globound"));
96 OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName()));
97 OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements()));
98 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
99 // TODO Use COMDAT groups for LinkOnceLinkage
100 OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+
106 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
107 // Check to see if this is a special global used by LLVM, if so, emit it.
108 if (!GV->hasInitializer() ||
109 EmitSpecialLLVMGlobal(GV))
112 const TargetData *TD = TM.getTargetData();
113 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
116 MCSymbol *GVSym = Mang->getSymbol(GV);
117 Constant *C = GV->getInitializer();
118 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
120 // Mark the start of the global
121 OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
124 switch (GV->getLinkage()) {
125 case GlobalValue::AppendingLinkage:
126 report_fatal_error("AppendingLinkage is not supported by this target!");
127 case GlobalValue::LinkOnceAnyLinkage:
128 case GlobalValue::LinkOnceODRLinkage:
129 case GlobalValue::WeakAnyLinkage:
130 case GlobalValue::WeakODRLinkage:
131 case GlobalValue::ExternalLinkage:
132 emitArrayBound(GVSym, GV);
133 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
135 // TODO Use COMDAT groups for LinkOnceLinkage
136 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
137 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
139 case GlobalValue::InternalLinkage:
140 case GlobalValue::PrivateLinkage:
141 case GlobalValue::LinkerPrivateLinkage:
143 case GlobalValue::DLLImportLinkage:
144 llvm_unreachable("DLLImport linkage is not supported by this target!");
145 case GlobalValue::DLLExportLinkage:
146 llvm_unreachable("DLLExport linkage is not supported by this target!");
148 llvm_unreachable("Unknown linkage type!");
151 EmitAlignment(Align > 2 ? Align : 2, GV);
153 unsigned Size = TD->getTypeAllocSize(C->getType());
154 if (GV->isThreadLocal()) {
157 if (MAI->hasDotTypeDotSizeDirective()) {
158 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
159 OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
162 OutStreamer.EmitLabel(GVSym);
164 EmitGlobalConstant(C);
165 if (GV->isThreadLocal()) {
166 for (unsigned i = 1; i < MaxThreads; ++i)
167 EmitGlobalConstant(C);
169 // The ABI requires that unsigned scalar types smaller than 32 bits
170 // are padded to 32 bits.
172 OutStreamer.EmitZeros(4 - Size, 0);
174 // Mark the end of the global
175 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
178 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
179 /// the last basic block in the function.
180 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
181 // Emit function end directives
182 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
186 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
187 // Mark the start of the function
188 OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
189 ".function," + CurrentFnSym->getName());
190 OutStreamer.EmitLabel(CurrentFnSym);
193 void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
195 printOperand(MI, opNum, O);
197 if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
201 printOperand(MI, opNum+1, O);
204 void XCoreAsmPrinter::
205 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
206 const std::string &directive) {
207 unsigned JTI = MI->getOperand(opNum).getIndex();
208 const MachineFunction *MF = MI->getParent()->getParent();
209 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
210 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
211 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
212 O << "\t" << directive << " ";
213 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
214 MachineBasicBlock *MBB = JTBBs[i];
217 O << *MBB->getSymbol();
221 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
223 const MachineOperand &MO = MI->getOperand(opNum);
224 switch (MO.getType()) {
225 case MachineOperand::MO_Register:
226 O << getRegisterName(MO.getReg());
228 case MachineOperand::MO_Immediate:
231 case MachineOperand::MO_MachineBasicBlock:
232 O << *MO.getMBB()->getSymbol();
234 case MachineOperand::MO_GlobalAddress:
235 O << *Mang->getSymbol(MO.getGlobal());
237 case MachineOperand::MO_ExternalSymbol:
238 O << MO.getSymbolName();
240 case MachineOperand::MO_ConstantPoolIndex:
241 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
242 << '_' << MO.getIndex();
244 case MachineOperand::MO_JumpTableIndex:
245 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
246 << '_' << MO.getIndex();
248 case MachineOperand::MO_BlockAddress:
249 O << *GetBlockAddressSymbol(MO.getBlockAddress());
252 llvm_unreachable("not implemented");
256 /// PrintAsmOperand - Print out an operand for an inline asm expression.
258 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
259 unsigned AsmVariant,const char *ExtraCode,
261 printOperand(MI, OpNo, O);
265 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
266 SmallString<128> Str;
267 raw_svector_ostream O(Str);
269 // Check for mov mnemonic
270 unsigned src, dst, srcSR, dstSR;
271 if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) {
272 O << "\tmov " << getRegisterName(dst) << ", ";
273 O << getRegisterName(src);
275 printInstruction(MI, O);
277 OutStreamer.EmitRawText(O.str());
280 // Force static initialization.
281 extern "C" void LLVMInitializeXCoreAsmPrinter() {
282 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);