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 "XCoreTargetStreamer.h"
18 #include "InstPrinter/XCoreInstPrinter.h"
19 #include "XCoreInstrInfo.h"
20 #include "XCoreMCInstLower.h"
21 #include "XCoreSubtarget.h"
22 #include "XCoreTargetMachine.h"
23 #include "llvm/ADT/SmallString.h"
24 #include "llvm/ADT/StringExtras.h"
25 #include "llvm/CodeGen/AsmPrinter.h"
26 #include "llvm/CodeGen/MachineConstantPool.h"
27 #include "llvm/CodeGen/MachineFunctionPass.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/CodeGen/MachineJumpTableInfo.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/DebugInfo.h"
32 #include "llvm/IR/Constants.h"
33 #include "llvm/IR/DataLayout.h"
34 #include "llvm/IR/DerivedTypes.h"
35 #include "llvm/IR/Mangler.h"
36 #include "llvm/IR/Module.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/MC/MCExpr.h"
39 #include "llvm/MC/MCInst.h"
40 #include "llvm/MC/MCStreamer.h"
41 #include "llvm/MC/MCSymbol.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/TargetRegistry.h"
44 #include "llvm/Support/raw_ostream.h"
45 #include "llvm/Target/TargetLoweringObjectFile.h"
51 class XCoreAsmPrinter : public AsmPrinter {
52 const XCoreSubtarget &Subtarget;
53 XCoreMCInstLower MCInstLowering;
54 XCoreTargetStreamer &getTargetStreamer();
57 explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
58 : AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()),
59 MCInstLowering(*this) {}
61 virtual const char *getPassName() const {
62 return "XCore Assembly Printer";
65 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
66 const std::string &directive = ".jmptable");
67 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
68 printInlineJT(MI, opNum, O, ".jmptable32");
70 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
71 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
72 unsigned AsmVariant, const char *ExtraCode,
75 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
76 virtual void EmitGlobalVariable(const GlobalVariable *GV);
78 void EmitFunctionEntryLabel();
79 void EmitInstruction(const MachineInstr *MI);
80 void EmitFunctionBodyStart();
81 void EmitFunctionBodyEnd();
83 } // end of anonymous namespace
85 XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() {
86 return static_cast<XCoreTargetStreamer&>(*OutStreamer.getTargetStreamer());
89 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
90 assert(((GV->hasExternalLinkage() ||
91 GV->hasWeakLinkage()) ||
92 GV->hasLinkOnceLinkage()) && "Unexpected linkage");
93 if (ArrayType *ATy = dyn_cast<ArrayType>(
94 cast<PointerType>(GV->getType())->getElementType())) {
96 MCSymbol *SymGlob = OutContext.GetOrCreateSymbol(
97 Twine(Sym->getName() + StringRef(".globound")));
98 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Global);
99 OutStreamer.EmitAssignment(SymGlob,
100 MCConstantExpr::Create(ATy->getNumElements(),
102 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
103 // TODO Use COMDAT groups for LinkOnceLinkage
104 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Weak);
109 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
110 // Check to see if this is a special global used by LLVM, if so, emit it.
111 if (!GV->hasInitializer() ||
112 EmitSpecialLLVMGlobal(GV))
115 const DataLayout *TD = TM.getDataLayout();
116 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
119 MCSymbol *GVSym = getSymbol(GV);
120 const Constant *C = GV->getInitializer();
121 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
123 // Mark the start of the global
124 getTargetStreamer().emitCCTopData(GVSym->getName());
126 switch (GV->getLinkage()) {
127 case GlobalValue::AppendingLinkage:
128 report_fatal_error("AppendingLinkage is not supported by this target!");
129 case GlobalValue::LinkOnceAnyLinkage:
130 case GlobalValue::LinkOnceODRLinkage:
131 case GlobalValue::WeakAnyLinkage:
132 case GlobalValue::WeakODRLinkage:
133 case GlobalValue::ExternalLinkage:
134 emitArrayBound(GVSym, GV);
135 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
137 // TODO Use COMDAT groups for LinkOnceLinkage
138 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
139 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
141 case GlobalValue::InternalLinkage:
142 case GlobalValue::PrivateLinkage:
145 llvm_unreachable("Unknown linkage type!");
148 EmitAlignment(Align > 2 ? Align : 2, GV);
150 if (GV->isThreadLocal()) {
151 report_fatal_error("TLS is not supported by this target!");
153 unsigned Size = TD->getTypeAllocSize(C->getType());
154 if (MAI->hasDotTypeDotSizeDirective()) {
155 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
156 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
158 OutStreamer.EmitLabel(GVSym);
160 EmitGlobalConstant(C);
161 // The ABI requires that unsigned scalar types smaller than 32 bits
162 // are padded to 32 bits.
164 OutStreamer.EmitZeros(4 - Size);
166 // Mark the end of the global
167 getTargetStreamer().emitCCBottomData(GVSym->getName());
170 void XCoreAsmPrinter::EmitFunctionBodyStart() {
171 MCInstLowering.Initialize(Mang, &MF->getContext());
174 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
175 /// the last basic block in the function.
176 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
177 // Emit function end directives
178 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
181 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
182 // Mark the start of the function
183 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
184 OutStreamer.EmitLabel(CurrentFnSym);
187 void XCoreAsmPrinter::
188 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
189 const std::string &directive) {
190 unsigned JTI = MI->getOperand(opNum).getIndex();
191 const MachineFunction *MF = MI->getParent()->getParent();
192 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
193 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
194 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
195 O << "\t" << directive << " ";
196 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
197 MachineBasicBlock *MBB = JTBBs[i];
200 O << *MBB->getSymbol();
204 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
206 const DataLayout *DL = TM.getDataLayout();
207 const MachineOperand &MO = MI->getOperand(opNum);
208 switch (MO.getType()) {
209 case MachineOperand::MO_Register:
210 O << XCoreInstPrinter::getRegisterName(MO.getReg());
212 case MachineOperand::MO_Immediate:
215 case MachineOperand::MO_MachineBasicBlock:
216 O << *MO.getMBB()->getSymbol();
218 case MachineOperand::MO_GlobalAddress:
219 O << *getSymbol(MO.getGlobal());
221 case MachineOperand::MO_ConstantPoolIndex:
222 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
223 << '_' << MO.getIndex();
225 case MachineOperand::MO_BlockAddress:
226 O << *GetBlockAddressSymbol(MO.getBlockAddress());
229 llvm_unreachable("not implemented");
233 /// PrintAsmOperand - Print out an operand for an inline asm expression.
235 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
236 unsigned AsmVariant,const char *ExtraCode,
238 // Print the operand if there is no operand modifier.
239 if (!ExtraCode || !ExtraCode[0]) {
240 printOperand(MI, OpNo, O);
244 // Otherwise fallback on the default implementation.
245 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
249 SmallString<128> Str;
250 raw_svector_ostream O(Str);
252 switch (MI->getOpcode()) {
253 case XCore::DBG_VALUE:
254 llvm_unreachable("Should be handled target independently");
255 case XCore::ADD_2rus:
256 if (MI->getOperand(2).getImm() == 0) {
258 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
259 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
260 OutStreamer.EmitRawText(O.str());
267 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
268 if (MI->getOpcode() == XCore::BR_JT)
269 printInlineJT(MI, 0, O);
271 printInlineJT32(MI, 0, O);
273 OutStreamer.EmitRawText(O.str());
278 MCInstLowering.Lower(MI, TmpInst);
280 EmitToStreamer(OutStreamer, TmpInst);
283 // Force static initialization.
284 extern "C" void LLVMInitializeXCoreAsmPrinter() {
285 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);