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 "InstPrinter/XCoreInstPrinter.h"
18 #include "XCoreInstrInfo.h"
19 #include "XCoreMCInstLower.h"
20 #include "XCoreSubtarget.h"
21 #include "XCoreTargetMachine.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/CodeGen/AsmPrinter.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineInstr.h"
28 #include "llvm/CodeGen/MachineJumpTableInfo.h"
29 #include "llvm/CodeGen/MachineModuleInfo.h"
30 #include "llvm/DebugInfo.h"
31 #include "llvm/IR/Constants.h"
32 #include "llvm/IR/DataLayout.h"
33 #include "llvm/IR/DerivedTypes.h"
34 #include "llvm/IR/Module.h"
35 #include "llvm/MC/MCAsmInfo.h"
36 #include "llvm/MC/MCInst.h"
37 #include "llvm/MC/MCStreamer.h"
38 #include "llvm/MC/MCSymbol.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/TargetRegistry.h"
41 #include "llvm/Support/raw_ostream.h"
42 #include "llvm/Target/Mangler.h"
43 #include "llvm/Target/TargetLoweringObjectFile.h"
49 class XCoreAsmPrinter : public AsmPrinter {
50 const XCoreSubtarget &Subtarget;
51 XCoreMCInstLower MCInstLowering;
53 explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
54 : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()),
55 MCInstLowering(*this) {}
57 virtual const char *getPassName() const {
58 return "XCore Assembly Printer";
61 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
62 const std::string &directive = ".jmptable");
63 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
64 printInlineJT(MI, opNum, O, ".jmptable32");
66 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
67 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
68 unsigned AsmVariant, const char *ExtraCode,
71 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
72 virtual void EmitGlobalVariable(const GlobalVariable *GV);
74 void EmitFunctionEntryLabel();
75 void EmitInstruction(const MachineInstr *MI);
76 void EmitFunctionBodyStart();
77 void EmitFunctionBodyEnd();
79 } // end of anonymous namespace
81 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
82 assert(((GV->hasExternalLinkage() ||
83 GV->hasWeakLinkage()) ||
84 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
85 if (ArrayType *ATy = dyn_cast<ArrayType>(
86 cast<PointerType>(GV->getType())->getElementType())) {
87 OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
88 // FIXME: MCStreamerize.
89 OutStreamer.EmitRawText(StringRef(".globound"));
90 OutStreamer.EmitRawText("\t.set\t" + Twine(Sym->getName()));
91 OutStreamer.EmitRawText(".globound," + Twine(ATy->getNumElements()));
92 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
93 // TODO Use COMDAT groups for LinkOnceLinkage
94 OutStreamer.EmitRawText(MAI->getWeakDefDirective() +Twine(Sym->getName())+
100 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
101 // Check to see if this is a special global used by LLVM, if so, emit it.
102 if (!GV->hasInitializer() ||
103 EmitSpecialLLVMGlobal(GV))
106 const DataLayout *TD = TM.getDataLayout();
107 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
110 MCSymbol *GVSym = Mang->getSymbol(GV);
111 const Constant *C = GV->getInitializer();
112 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
114 // Mark the start of the global
115 OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
118 switch (GV->getLinkage()) {
119 case GlobalValue::AppendingLinkage:
120 report_fatal_error("AppendingLinkage is not supported by this target!");
121 case GlobalValue::LinkOnceAnyLinkage:
122 case GlobalValue::LinkOnceODRLinkage:
123 case GlobalValue::WeakAnyLinkage:
124 case GlobalValue::WeakODRLinkage:
125 case GlobalValue::ExternalLinkage:
126 emitArrayBound(GVSym, GV);
127 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
129 // TODO Use COMDAT groups for LinkOnceLinkage
130 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
131 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
133 case GlobalValue::InternalLinkage:
134 case GlobalValue::PrivateLinkage:
136 case GlobalValue::DLLImportLinkage:
137 llvm_unreachable("DLLImport linkage is not supported by this target!");
138 case GlobalValue::DLLExportLinkage:
139 llvm_unreachable("DLLExport linkage is not supported by this target!");
141 llvm_unreachable("Unknown linkage type!");
144 EmitAlignment(Align > 2 ? Align : 2, GV);
146 if (GV->isThreadLocal()) {
147 report_fatal_error("TLS is not supported by this target!");
149 unsigned Size = TD->getTypeAllocSize(C->getType());
150 if (MAI->hasDotTypeDotSizeDirective()) {
151 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
152 OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
155 OutStreamer.EmitLabel(GVSym);
157 EmitGlobalConstant(C);
158 // The ABI requires that unsigned scalar types smaller than 32 bits
159 // are padded to 32 bits.
161 OutStreamer.EmitZeros(4 - Size);
163 // Mark the end of the global
164 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
167 void XCoreAsmPrinter::EmitFunctionBodyStart() {
168 MCInstLowering.Initialize(Mang, &MF->getContext());
171 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
172 /// the last basic block in the function.
173 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
174 // Emit function end directives
175 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
179 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
180 // Mark the start of the function
181 OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
182 ".function," + CurrentFnSym->getName());
183 OutStreamer.EmitLabel(CurrentFnSym);
186 void XCoreAsmPrinter::
187 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
188 const std::string &directive) {
189 unsigned JTI = MI->getOperand(opNum).getIndex();
190 const MachineFunction *MF = MI->getParent()->getParent();
191 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
192 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
193 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
194 O << "\t" << directive << " ";
195 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
196 MachineBasicBlock *MBB = JTBBs[i];
199 O << *MBB->getSymbol();
203 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
205 const MachineOperand &MO = MI->getOperand(opNum);
206 switch (MO.getType()) {
207 case MachineOperand::MO_Register:
208 O << XCoreInstPrinter::getRegisterName(MO.getReg());
210 case MachineOperand::MO_Immediate:
213 case MachineOperand::MO_MachineBasicBlock:
214 O << *MO.getMBB()->getSymbol();
216 case MachineOperand::MO_GlobalAddress:
217 O << *Mang->getSymbol(MO.getGlobal());
219 case MachineOperand::MO_ExternalSymbol:
220 O << MO.getSymbolName();
222 case MachineOperand::MO_ConstantPoolIndex:
223 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
224 << '_' << MO.getIndex();
226 case MachineOperand::MO_JumpTableIndex:
227 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
228 << '_' << MO.getIndex();
230 case MachineOperand::MO_BlockAddress:
231 O << *GetBlockAddressSymbol(MO.getBlockAddress());
234 llvm_unreachable("not implemented");
238 /// PrintAsmOperand - Print out an operand for an inline asm expression.
240 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
241 unsigned AsmVariant,const char *ExtraCode,
243 // Print the operand if there is no operand modifier.
244 if (!ExtraCode || !ExtraCode[0]) {
245 printOperand(MI, OpNo, O);
249 // Otherwise fallback on the default implementation.
250 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
253 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
254 SmallString<128> Str;
255 raw_svector_ostream O(Str);
257 switch (MI->getOpcode()) {
258 case XCore::DBG_VALUE:
259 llvm_unreachable("Should be handled target independently");
260 case XCore::ADD_2rus:
261 if (MI->getOperand(2).getImm() == 0) {
263 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
264 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
265 OutStreamer.EmitRawText(O.str());
272 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
273 if (MI->getOpcode() == XCore::BR_JT)
274 printInlineJT(MI, 0, O);
276 printInlineJT32(MI, 0, O);
278 OutStreamer.EmitRawText(O.str());
283 MCInstLowering.Lower(MI, TmpInst);
285 OutStreamer.EmitInstruction(TmpInst);
288 // Force static initialization.
289 extern "C" void LLVMInitializeXCoreAsmPrinter() {
290 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);