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() || GV->hasWeakLinkage() ||
91 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) &&
92 "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 GV->hasCommonLinkage()) {
104 // TODO Use COMDAT groups for LinkOnceLinkage
105 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Weak);
110 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
111 // Check to see if this is a special global used by LLVM, if so, emit it.
112 if (!GV->hasInitializer() ||
113 EmitSpecialLLVMGlobal(GV))
116 const DataLayout *TD = TM.getDataLayout();
117 OutStreamer.SwitchSection(
118 getObjFileLowering().SectionForGlobal(GV, *Mang, TM));
120 MCSymbol *GVSym = getSymbol(GV);
121 const Constant *C = GV->getInitializer();
122 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
124 // Mark the start of the global
125 getTargetStreamer().emitCCTopData(GVSym->getName());
127 switch (GV->getLinkage()) {
128 case GlobalValue::AppendingLinkage:
129 report_fatal_error("AppendingLinkage is not supported by this target!");
130 case GlobalValue::LinkOnceAnyLinkage:
131 case GlobalValue::LinkOnceODRLinkage:
132 case GlobalValue::WeakAnyLinkage:
133 case GlobalValue::WeakODRLinkage:
134 case GlobalValue::ExternalLinkage:
135 case GlobalValue::CommonLinkage:
136 emitArrayBound(GVSym, GV);
137 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
139 // TODO Use COMDAT groups for LinkOnceLinkage
140 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
141 GV->hasCommonLinkage())
142 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
144 case GlobalValue::InternalLinkage:
145 case GlobalValue::PrivateLinkage:
148 llvm_unreachable("Unknown linkage type!");
151 EmitAlignment(Align > 2 ? Align : 2, GV);
153 if (GV->isThreadLocal()) {
154 report_fatal_error("TLS is not supported by this target!");
156 unsigned Size = TD->getTypeAllocSize(C->getType());
157 if (MAI->hasDotTypeDotSizeDirective()) {
158 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
159 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
161 OutStreamer.EmitLabel(GVSym);
163 EmitGlobalConstant(C);
164 // The ABI requires that unsigned scalar types smaller than 32 bits
165 // are padded to 32 bits.
167 OutStreamer.EmitZeros(4 - Size);
169 // Mark the end of the global
170 getTargetStreamer().emitCCBottomData(GVSym->getName());
173 void XCoreAsmPrinter::EmitFunctionBodyStart() {
174 MCInstLowering.Initialize(Mang, &MF->getContext());
177 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
178 /// the last basic block in the function.
179 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
180 // Emit function end directives
181 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
184 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
185 // Mark the start of the function
186 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
187 OutStreamer.EmitLabel(CurrentFnSym);
190 void XCoreAsmPrinter::
191 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
192 const std::string &directive) {
193 unsigned JTI = MI->getOperand(opNum).getIndex();
194 const MachineFunction *MF = MI->getParent()->getParent();
195 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
196 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
197 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
198 O << "\t" << directive << " ";
199 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
200 MachineBasicBlock *MBB = JTBBs[i];
203 O << *MBB->getSymbol();
207 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
209 const DataLayout *DL = TM.getDataLayout();
210 const MachineOperand &MO = MI->getOperand(opNum);
211 switch (MO.getType()) {
212 case MachineOperand::MO_Register:
213 O << XCoreInstPrinter::getRegisterName(MO.getReg());
215 case MachineOperand::MO_Immediate:
218 case MachineOperand::MO_MachineBasicBlock:
219 O << *MO.getMBB()->getSymbol();
221 case MachineOperand::MO_GlobalAddress:
222 O << *getSymbol(MO.getGlobal());
224 case MachineOperand::MO_ConstantPoolIndex:
225 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
226 << '_' << MO.getIndex();
228 case MachineOperand::MO_BlockAddress:
229 O << *GetBlockAddressSymbol(MO.getBlockAddress());
232 llvm_unreachable("not implemented");
236 /// PrintAsmOperand - Print out an operand for an inline asm expression.
238 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
239 unsigned AsmVariant,const char *ExtraCode,
241 // Print the operand if there is no operand modifier.
242 if (!ExtraCode || !ExtraCode[0]) {
243 printOperand(MI, OpNo, O);
247 // Otherwise fallback on the default implementation.
248 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
251 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
252 SmallString<128> Str;
253 raw_svector_ostream O(Str);
255 switch (MI->getOpcode()) {
256 case XCore::DBG_VALUE:
257 llvm_unreachable("Should be handled target independently");
258 case XCore::ADD_2rus:
259 if (MI->getOperand(2).getImm() == 0) {
261 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
262 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
263 OutStreamer.EmitRawText(O.str());
270 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
271 if (MI->getOpcode() == XCore::BR_JT)
272 printInlineJT(MI, 0, O);
274 printInlineJT32(MI, 0, O);
276 OutStreamer.EmitRawText(O.str());
281 MCInstLowering.Lower(MI, TmpInst);
283 EmitToStreamer(OutStreamer, TmpInst);
286 // Force static initialization.
287 extern "C" void LLVMInitializeXCoreAsmPrinter() {
288 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);