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/Mangler.h"
35 #include "llvm/IR/Module.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/MC/MCExpr.h"
38 #include "llvm/MC/MCInst.h"
39 #include "llvm/MC/MCStreamer.h"
40 #include "llvm/MC/MCSymbol.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/TargetRegistry.h"
43 #include "llvm/Support/raw_ostream.h"
44 #include "llvm/Target/TargetLoweringObjectFile.h"
50 class XCoreAsmPrinter : public AsmPrinter {
51 const XCoreSubtarget &Subtarget;
52 XCoreMCInstLower MCInstLowering;
54 explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
55 : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()),
56 MCInstLowering(*this) {}
58 virtual const char *getPassName() const {
59 return "XCore Assembly Printer";
62 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
63 const std::string &directive = ".jmptable");
64 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
65 printInlineJT(MI, opNum, O, ".jmptable32");
67 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
68 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
69 unsigned AsmVariant, const char *ExtraCode,
72 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
73 virtual void EmitGlobalVariable(const GlobalVariable *GV);
75 void EmitFunctionEntryLabel();
76 void EmitInstruction(const MachineInstr *MI);
77 void EmitFunctionBodyStart();
78 void EmitFunctionBodyEnd();
80 } // end of anonymous namespace
82 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
83 assert(((GV->hasExternalLinkage() ||
84 GV->hasWeakLinkage()) ||
85 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
86 if (ArrayType *ATy = dyn_cast<ArrayType>(
87 cast<PointerType>(GV->getType())->getElementType())) {
89 MCSymbol *SymGlob = OutContext.GetOrCreateSymbol(
90 Twine(Sym->getName() + StringRef(".globound")));
91 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Global);
92 OutStreamer.EmitAssignment(SymGlob,
93 MCConstantExpr::Create(ATy->getNumElements(),
95 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
96 // TODO Use COMDAT groups for LinkOnceLinkage
97 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Weak);
102 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
103 // Check to see if this is a special global used by LLVM, if so, emit it.
104 if (!GV->hasInitializer() ||
105 EmitSpecialLLVMGlobal(GV))
108 const DataLayout *TD = TM.getDataLayout();
109 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
112 MCSymbol *GVSym = getSymbol(GV);
113 const Constant *C = GV->getInitializer();
114 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
116 // Mark the start of the global
117 OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
120 switch (GV->getLinkage()) {
121 case GlobalValue::AppendingLinkage:
122 report_fatal_error("AppendingLinkage is not supported by this target!");
123 case GlobalValue::LinkOnceAnyLinkage:
124 case GlobalValue::LinkOnceODRLinkage:
125 case GlobalValue::WeakAnyLinkage:
126 case GlobalValue::WeakODRLinkage:
127 case GlobalValue::ExternalLinkage:
128 emitArrayBound(GVSym, GV);
129 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
131 // TODO Use COMDAT groups for LinkOnceLinkage
132 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
133 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
135 case GlobalValue::InternalLinkage:
136 case GlobalValue::PrivateLinkage:
139 llvm_unreachable("Unknown linkage type!");
142 EmitAlignment(Align > 2 ? Align : 2, GV);
144 if (GV->isThreadLocal()) {
145 report_fatal_error("TLS is not supported by this target!");
147 unsigned Size = TD->getTypeAllocSize(C->getType());
148 if (MAI->hasDotTypeDotSizeDirective()) {
149 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
150 OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
153 OutStreamer.EmitLabel(GVSym);
155 EmitGlobalConstant(C);
156 // The ABI requires that unsigned scalar types smaller than 32 bits
157 // are padded to 32 bits.
159 OutStreamer.EmitZeros(4 - Size);
161 // Mark the end of the global
162 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
165 void XCoreAsmPrinter::EmitFunctionBodyStart() {
166 MCInstLowering.Initialize(Mang, &MF->getContext());
169 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
170 /// the last basic block in the function.
171 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
172 // Emit function end directives
173 OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
177 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
178 // Mark the start of the function
179 OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
180 ".function," + CurrentFnSym->getName());
181 OutStreamer.EmitLabel(CurrentFnSym);
184 void XCoreAsmPrinter::
185 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
186 const std::string &directive) {
187 unsigned JTI = MI->getOperand(opNum).getIndex();
188 const MachineFunction *MF = MI->getParent()->getParent();
189 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
190 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
191 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
192 O << "\t" << directive << " ";
193 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
194 MachineBasicBlock *MBB = JTBBs[i];
197 O << *MBB->getSymbol();
201 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
203 const DataLayout *DL = TM.getDataLayout();
204 const MachineOperand &MO = MI->getOperand(opNum);
205 switch (MO.getType()) {
206 case MachineOperand::MO_Register:
207 O << XCoreInstPrinter::getRegisterName(MO.getReg());
209 case MachineOperand::MO_Immediate:
212 case MachineOperand::MO_MachineBasicBlock:
213 O << *MO.getMBB()->getSymbol();
215 case MachineOperand::MO_GlobalAddress:
216 O << *getSymbol(MO.getGlobal());
218 case MachineOperand::MO_ConstantPoolIndex:
219 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
220 << '_' << MO.getIndex();
222 case MachineOperand::MO_BlockAddress:
223 O << *GetBlockAddressSymbol(MO.getBlockAddress());
226 llvm_unreachable("not implemented");
230 /// PrintAsmOperand - Print out an operand for an inline asm expression.
232 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
233 unsigned AsmVariant,const char *ExtraCode,
235 // Print the operand if there is no operand modifier.
236 if (!ExtraCode || !ExtraCode[0]) {
237 printOperand(MI, OpNo, O);
241 // Otherwise fallback on the default implementation.
242 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
245 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
246 SmallString<128> Str;
247 raw_svector_ostream O(Str);
249 switch (MI->getOpcode()) {
250 case XCore::DBG_VALUE:
251 llvm_unreachable("Should be handled target independently");
252 case XCore::ADD_2rus:
253 if (MI->getOperand(2).getImm() == 0) {
255 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
256 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
257 OutStreamer.EmitRawText(O.str());
264 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
265 if (MI->getOpcode() == XCore::BR_JT)
266 printInlineJT(MI, 0, O);
268 printInlineJT32(MI, 0, O);
270 OutStreamer.EmitRawText(O.str());
275 MCInstLowering.Lower(MI, TmpInst);
277 OutStreamer.EmitInstruction(TmpInst);
280 // Force static initialization.
281 extern "C" void LLVMInitializeXCoreAsmPrinter() {
282 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);