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https://github.com/c64scene-ar/llvm-6502.git
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8e0f67dcec
Before this patch any program that wanted to know the final symbol name of a GlobalValue had to link with Target. This patch implements a compromise solution where the mangler uses DataLayout. This way, any tool that already links with Target (llc, clang) gets the exact behavior as before and new IR files can be mangled without linking with Target. With this patch the mangler is constructed with just a DataLayout and DataLayout is extended to include the information the Mangler needs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198438 91177308-0d34-0410-b5e6-96231b3b80d8
288 lines
9.9 KiB
C++
288 lines
9.9 KiB
C++
//===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to the XAS-format XCore assembly language.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "XCore.h"
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#include "InstPrinter/XCoreInstPrinter.h"
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#include "XCoreInstrInfo.h"
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#include "XCoreMCInstLower.h"
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#include "XCoreSubtarget.h"
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#include "XCoreTargetMachine.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/DebugInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include <algorithm>
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#include <cctype>
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using namespace llvm;
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namespace {
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class XCoreAsmPrinter : public AsmPrinter {
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const XCoreSubtarget &Subtarget;
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XCoreMCInstLower MCInstLowering;
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public:
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explicit XCoreAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
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: AsmPrinter(TM, Streamer), Subtarget(TM.getSubtarget<XCoreSubtarget>()),
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MCInstLowering(*this) {}
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virtual const char *getPassName() const {
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return "XCore Assembly Printer";
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}
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void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
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const std::string &directive = ".jmptable");
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void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) {
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printInlineJT(MI, opNum, O, ".jmptable32");
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}
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &O);
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void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV);
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virtual void EmitGlobalVariable(const GlobalVariable *GV);
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void EmitFunctionEntryLabel();
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void EmitInstruction(const MachineInstr *MI);
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void EmitFunctionBodyStart();
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void EmitFunctionBodyEnd();
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};
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} // end of anonymous namespace
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void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) {
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assert(((GV->hasExternalLinkage() ||
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GV->hasWeakLinkage()) ||
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GV->hasLinkOnceLinkage()) && "Unexpected linkage");
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if (ArrayType *ATy = dyn_cast<ArrayType>(
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cast<PointerType>(GV->getType())->getElementType())) {
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MCSymbol *SymGlob = OutContext.GetOrCreateSymbol(
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Twine(Sym->getName() + StringRef(".globound")));
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OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Global);
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OutStreamer.EmitAssignment(SymGlob,
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MCConstantExpr::Create(ATy->getNumElements(),
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OutContext));
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
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// TODO Use COMDAT groups for LinkOnceLinkage
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OutStreamer.EmitSymbolAttribute(SymGlob, MCSA_Weak);
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}
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}
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}
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void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
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// Check to see if this is a special global used by LLVM, if so, emit it.
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if (!GV->hasInitializer() ||
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EmitSpecialLLVMGlobal(GV))
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return;
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const DataLayout *TD = TM.getDataLayout();
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OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GV, Mang,TM));
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MCSymbol *GVSym = getSymbol(GV);
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const Constant *C = GV->getInitializer();
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unsigned Align = (unsigned)TD->getPreferredTypeAlignmentShift(C->getType());
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// Mark the start of the global
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OutStreamer.EmitRawText("\t.cc_top " + Twine(GVSym->getName()) + ".data," +
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GVSym->getName());
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switch (GV->getLinkage()) {
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case GlobalValue::AppendingLinkage:
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report_fatal_error("AppendingLinkage is not supported by this target!");
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case GlobalValue::LinkOnceAnyLinkage:
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case GlobalValue::LinkOnceODRLinkage:
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case GlobalValue::WeakAnyLinkage:
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case GlobalValue::WeakODRLinkage:
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case GlobalValue::ExternalLinkage:
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emitArrayBound(GVSym, GV);
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
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// TODO Use COMDAT groups for LinkOnceLinkage
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
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// FALL THROUGH
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case GlobalValue::InternalLinkage:
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case GlobalValue::PrivateLinkage:
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break;
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case GlobalValue::DLLImportLinkage:
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llvm_unreachable("DLLImport linkage is not supported by this target!");
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case GlobalValue::DLLExportLinkage:
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llvm_unreachable("DLLExport linkage is not supported by this target!");
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default:
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llvm_unreachable("Unknown linkage type!");
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}
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EmitAlignment(Align > 2 ? Align : 2, GV);
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if (GV->isThreadLocal()) {
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report_fatal_error("TLS is not supported by this target!");
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}
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unsigned Size = TD->getTypeAllocSize(C->getType());
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if (MAI->hasDotTypeDotSizeDirective()) {
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OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
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OutStreamer.EmitRawText("\t.size " + Twine(GVSym->getName()) + "," +
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Twine(Size));
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}
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OutStreamer.EmitLabel(GVSym);
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EmitGlobalConstant(C);
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// The ABI requires that unsigned scalar types smaller than 32 bits
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// are padded to 32 bits.
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if (Size < 4)
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OutStreamer.EmitZeros(4 - Size);
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// Mark the end of the global
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OutStreamer.EmitRawText("\t.cc_bottom " + Twine(GVSym->getName()) + ".data");
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}
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void XCoreAsmPrinter::EmitFunctionBodyStart() {
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MCInstLowering.Initialize(Mang, &MF->getContext());
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}
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/// EmitFunctionBodyEnd - Targets can override this to emit stuff after
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/// the last basic block in the function.
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void XCoreAsmPrinter::EmitFunctionBodyEnd() {
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// Emit function end directives
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OutStreamer.EmitRawText("\t.cc_bottom " + Twine(CurrentFnSym->getName()) +
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".function");
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}
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void XCoreAsmPrinter::EmitFunctionEntryLabel() {
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// Mark the start of the function
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OutStreamer.EmitRawText("\t.cc_top " + Twine(CurrentFnSym->getName()) +
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".function," + CurrentFnSym->getName());
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OutStreamer.EmitLabel(CurrentFnSym);
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}
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void XCoreAsmPrinter::
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printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O,
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const std::string &directive) {
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unsigned JTI = MI->getOperand(opNum).getIndex();
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const MachineFunction *MF = MI->getParent()->getParent();
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const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
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O << "\t" << directive << " ";
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for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
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MachineBasicBlock *MBB = JTBBs[i];
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if (i > 0)
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O << ",";
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O << *MBB->getSymbol();
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}
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}
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void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
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raw_ostream &O) {
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const DataLayout *DL = TM.getDataLayout();
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const MachineOperand &MO = MI->getOperand(opNum);
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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O << XCoreInstPrinter::getRegisterName(MO.getReg());
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break;
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case MachineOperand::MO_Immediate:
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O << MO.getImm();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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O << *MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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O << *getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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break;
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case MachineOperand::MO_BlockAddress:
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O << *GetBlockAddressSymbol(MO.getBlockAddress());
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break;
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default:
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llvm_unreachable("not implemented");
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}
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}
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/// PrintAsmOperand - Print out an operand for an inline asm expression.
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///
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bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant,const char *ExtraCode,
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raw_ostream &O) {
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// Print the operand if there is no operand modifier.
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if (!ExtraCode || !ExtraCode[0]) {
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printOperand(MI, OpNo, O);
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return false;
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}
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// Otherwise fallback on the default implementation.
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return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
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}
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void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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SmallString<128> Str;
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raw_svector_ostream O(Str);
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switch (MI->getOpcode()) {
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case XCore::DBG_VALUE:
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llvm_unreachable("Should be handled target independently");
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case XCore::ADD_2rus:
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if (MI->getOperand(2).getImm() == 0) {
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O << "\tmov "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg());
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OutStreamer.EmitRawText(O.str());
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return;
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}
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break;
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case XCore::BR_JT:
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case XCore::BR_JT32:
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O << "\tbru "
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<< XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n';
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if (MI->getOpcode() == XCore::BR_JT)
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printInlineJT(MI, 0, O);
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else
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printInlineJT32(MI, 0, O);
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O << '\n';
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OutStreamer.EmitRawText(O.str());
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return;
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}
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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OutStreamer.EmitInstruction(TmpInst);
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}
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// Force static initialization.
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extern "C" void LLVMInitializeXCoreAsmPrinter() {
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RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget);
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}
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