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 //===----------------------------------------------------------------------===//
16 #include "InstPrinter/XCoreInstPrinter.h"
17 #include "XCoreInstrInfo.h"
18 #include "XCoreMCInstLower.h"
19 #include "XCoreSubtarget.h"
20 #include "XCoreTargetMachine.h"
21 #include "XCoreTargetStreamer.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/IR/Constants.h"
31 #include "llvm/IR/DataLayout.h"
32 #include "llvm/IR/DebugInfo.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"
49 #define DEBUG_TYPE "asm-printer"
52 class XCoreAsmPrinter : public AsmPrinter {
53 const XCoreSubtarget &Subtarget;
54 XCoreMCInstLower MCInstLowering;
55 XCoreTargetStreamer &getTargetStreamer();
58 explicit XCoreAsmPrinter(TargetMachine &TM,
59 std::unique_ptr<MCStreamer> Streamer)
60 : AsmPrinter(TM, std::move(Streamer)),
61 Subtarget(TM.getSubtarget<XCoreSubtarget>()), MCInstLowering(*this) {}
63 const char *getPassName() const override {
64 return "XCore Assembly Printer";
67 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
68 const std::string &directive = ".jmptable");
69 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
70 printInlineJT(MI, opNum, O, ".jmptable32");
72 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
73 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
74 unsigned AsmVariant, const char *ExtraCode,
75 raw_ostream &O) override;
76 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
77 unsigned AsmVariant, const char *ExtraCode,
78 raw_ostream &O) override;
80 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
81 void EmitGlobalVariable(const GlobalVariable *GV) override;
83 void EmitFunctionEntryLabel() override;
84 void EmitInstruction(const MachineInstr *MI) override;
85 void EmitFunctionBodyStart() override;
86 void EmitFunctionBodyEnd() override;
88 } // end of anonymous namespace
90 XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() {
91 return static_cast<XCoreTargetStreamer&>(*OutStreamer.getTargetStreamer());
94 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
95 assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() ||
96 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) &&
97 "Unexpected linkage");
98 if (ArrayType *ATy = dyn_cast<ArrayType>(
99 cast<PointerType>(GV->getType())->getElementType())) {
101 MCSymbol *SymGlob = OutContext.GetOrCreateSymbol(
102 Twine(Sym->getName() + StringRef(".globound")));
103 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Global);
104 OutStreamer.EmitAssignment(SymGlob,
105 MCConstantExpr::Create(ATy->getNumElements(),
107 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
108 GV->hasCommonLinkage()) {
109 OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Weak);
114 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
115 // Check to see if this is a special global used by LLVM, if so, emit it.
116 if (!GV->hasInitializer() ||
117 EmitSpecialLLVMGlobal(GV))
120 const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
121 OutStreamer.SwitchSection(
122 getObjFileLowering().SectionForGlobal(GV, *Mang, TM));
124 MCSymbol *GVSym = getSymbol(GV);
125 const Constant *C = GV->getInitializer();
126 unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
128 // Mark the start of the global
129 getTargetStreamer().emitCCTopData(GVSym->getName());
131 switch (GV->getLinkage()) {
132 case GlobalValue::AppendingLinkage:
133 report_fatal_error("AppendingLinkage is not supported by this target!");
134 case GlobalValue::LinkOnceAnyLinkage:
135 case GlobalValue::LinkOnceODRLinkage:
136 case GlobalValue::WeakAnyLinkage:
137 case GlobalValue::WeakODRLinkage:
138 case GlobalValue::ExternalLinkage:
139 case GlobalValue::CommonLinkage:
140 emitArrayBound(GVSym, GV);
141 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
143 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
144 GV->hasCommonLinkage())
145 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
147 case GlobalValue::InternalLinkage:
148 case GlobalValue::PrivateLinkage:
151 llvm_unreachable("Unknown linkage type!");
154 EmitAlignment(Align > 2 ? Align : 2, GV);
156 if (GV->isThreadLocal()) {
157 report_fatal_error("TLS is not supported by this target!");
159 unsigned Size = TD->getTypeAllocSize(C->getType());
160 if (MAI->hasDotTypeDotSizeDirective()) {
161 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
162 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
164 OutStreamer.EmitLabel(GVSym);
166 EmitGlobalConstant(C);
167 // The ABI requires that unsigned scalar types smaller than 32 bits
168 // are padded to 32 bits.
170 OutStreamer.EmitZeros(4 - Size);
172 // Mark the end of the global
173 getTargetStreamer().emitCCBottomData(GVSym->getName());
176 void XCoreAsmPrinter::EmitFunctionBodyStart() {
177 MCInstLowering.Initialize(Mang, &MF->getContext());
180 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
181 /// the last basic block in the function.
182 void XCoreAsmPrinter::EmitFunctionBodyEnd() {
183 // Emit function end directives
184 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName());
187 void XCoreAsmPrinter::EmitFunctionEntryLabel() {
188 // Mark the start of the function
189 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName());
190 OutStreamer.EmitLabel(CurrentFnSym);
193 void XCoreAsmPrinter::
194 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
195 const std::string &directive) {
196 unsigned JTI = MI->getOperand(opNum).getIndex();
197 const MachineFunction *MF = MI->getParent()->getParent();
198 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
199 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
200 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
201 O << "\t" << directive << " ";
202 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
203 MachineBasicBlock *MBB = JTBBs[i];
206 O << *MBB->getSymbol();
210 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
212 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
213 const MachineOperand &MO = MI->getOperand(opNum);
214 switch (MO.getType()) {
215 case MachineOperand::MO_Register:
216 O << XCoreInstPrinter::getRegisterName(MO.getReg());
218 case MachineOperand::MO_Immediate:
221 case MachineOperand::MO_MachineBasicBlock:
222 O << *MO.getMBB()->getSymbol();
224 case MachineOperand::MO_GlobalAddress:
225 O << *getSymbol(MO.getGlobal());
227 case MachineOperand::MO_ConstantPoolIndex:
228 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
229 << '_' << MO.getIndex();
231 case MachineOperand::MO_BlockAddress:
232 O << *GetBlockAddressSymbol(MO.getBlockAddress());
235 llvm_unreachable("not implemented");
239 /// PrintAsmOperand - Print out an operand for an inline asm expression.
241 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
242 unsigned AsmVariant,const char *ExtraCode,
244 // Print the operand if there is no operand modifier.
245 if (!ExtraCode || !ExtraCode[0]) {
246 printOperand(MI, OpNo, O);
250 // Otherwise fallback on the default implementation.
251 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
254 bool XCoreAsmPrinter::
255 PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
256 unsigned AsmVariant, const char *ExtraCode,
258 if (ExtraCode && ExtraCode[0]) {
259 return true; // Unknown modifier.
261 printOperand(MI, OpNum, O);
263 printOperand(MI, OpNum + 1, O);
268 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
269 SmallString<128> Str;
270 raw_svector_ostream O(Str);
272 switch (MI->getOpcode()) {
273 case XCore::DBG_VALUE:
274 llvm_unreachable("Should be handled target independently");
275 case XCore::ADD_2rus:
276 if (MI->getOperand(2).getImm() == 0) {
278 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
279 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
280 OutStreamer.EmitRawText(O.str());
287 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
288 if (MI->getOpcode() == XCore::BR_JT)
289 printInlineJT(MI, 0, O);
291 printInlineJT32(MI, 0, O);
293 OutStreamer.EmitRawText(O.str());
298 MCInstLowering.Lower(MI, TmpInst);
300 EmitToStreamer(OutStreamer, TmpInst);
303 // Force static initialization.
304 extern "C" void LLVMInitializeXCoreAsmPrinter() {
305 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);