467 lines
14 KiB
C++
467 lines
14 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 "XCoreInstrInfo.h"
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#include "XCoreSubtarget.h"
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#include "XCoreTargetMachine.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cctype>
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using namespace llvm;
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STATISTIC(EmittedInsts, "Number of machine instrs printed");
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static cl::opt<std::string> FileDirective("xcore-file-directive", cl::Optional,
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cl::desc("Output a file directive into the assembly file"),
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cl::Hidden,
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cl::value_desc("filename"),
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cl::init(""));
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static cl::opt<unsigned> MaxThreads("xcore-max-threads", cl::Optional,
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cl::desc("Maximum number of threads (for emulation thread-local storage)"),
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cl::Hidden,
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cl::value_desc("number"),
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cl::init(8));
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namespace {
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class VISIBILITY_HIDDEN XCoreAsmPrinter : public AsmPrinter {
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DwarfWriter *DW;
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const XCoreSubtarget &Subtarget;
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public:
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XCoreAsmPrinter(raw_ostream &O, XCoreTargetMachine &TM,
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const TargetAsmInfo *T, bool F)
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: AsmPrinter(O, TM, T, F), DW(0),
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Subtarget(*TM.getSubtargetImpl()) {}
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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 printMemOperand(const MachineInstr *MI, int opNum);
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void printOperand(const MachineInstr *MI, int opNum);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode);
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void emitFileDirective(const std::string &filename);
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void emitGlobalDirective(const std::string &name);
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void emitExternDirective(const std::string &name);
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void emitArrayBound(const std::string &name, const GlobalVariable *GV);
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void emitGlobal(const GlobalVariable *GV);
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void emitFunctionStart(MachineFunction &MF);
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void emitFunctionEnd(MachineFunction &MF);
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bool printInstruction(const MachineInstr *MI); // autogenerated.
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void printMachineInstruction(const MachineInstr *MI);
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bool runOnMachineFunction(MachineFunction &F);
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bool doInitialization(Module &M);
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bool doFinalization(Module &M);
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AsmPrinter::getAnalysisUsage(AU);
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AU.setPreservesAll();
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AU.addRequired<MachineModuleInfo>();
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AU.addRequired<DwarfWriter>();
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}
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};
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} // end of anonymous namespace
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#include "XCoreGenAsmWriter.inc"
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/// createXCoreCodePrinterPass - Returns a pass that prints the XCore
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/// assembly code for a MachineFunction to the given output stream,
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/// using the given target machine description. This should work
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/// regardless of whether the function is in SSA form.
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///
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FunctionPass *llvm::createXCoreCodePrinterPass(raw_ostream &o,
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XCoreTargetMachine &tm,
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bool fast) {
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return new XCoreAsmPrinter(o, tm, tm.getTargetAsmInfo(), fast);
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}
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// PrintEscapedString - Print each character of the specified string, escaping
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// it if it is not printable or if it is an escape char.
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static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
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for (unsigned i = 0, e = Str.size(); i != e; ++i) {
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unsigned char C = Str[i];
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if (isprint(C) && C != '"' && C != '\\') {
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Out << C;
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} else {
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Out << '\\'
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<< (char) ((C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'))
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<< (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
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}
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}
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}
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void XCoreAsmPrinter::
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emitFileDirective(const std::string &name)
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{
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O << "\t.file\t\"";
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PrintEscapedString(name, O);
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O << "\"\n";
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}
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void XCoreAsmPrinter::
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emitGlobalDirective(const std::string &name)
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{
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O << TAI->getGlobalDirective() << name;
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O << "\n";
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}
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void XCoreAsmPrinter::
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emitExternDirective(const std::string &name)
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{
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O << "\t.extern\t" << name;
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O << '\n';
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}
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void XCoreAsmPrinter::
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emitArrayBound(const std::string &name, const GlobalVariable *GV)
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{
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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 (const ArrayType *ATy = dyn_cast<ArrayType>(
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cast<PointerType>(GV->getType())->getElementType()))
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{
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O << TAI->getGlobalDirective() << name << ".globound" << "\n";
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O << TAI->getSetDirective() << name << ".globound" << ","
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<< ATy->getNumElements() << "\n";
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
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// TODO Use COMDAT groups for LinkOnceLinkage
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O << TAI->getWeakDefDirective() << name << ".globound" << "\n";
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}
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}
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}
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void XCoreAsmPrinter::
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emitGlobal(const GlobalVariable *GV)
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{
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const TargetData *TD = TM.getTargetData();
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if (GV->hasInitializer()) {
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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 (EmitSpecialLLVMGlobal(GV))
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return;
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SwitchToSection(TAI->SectionForGlobal(GV));
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std::string name = Mang->getValueName(GV);
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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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O << "\t.cc_top " << name << ".data," << name << "\n";
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switch (GV->getLinkage()) {
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case GlobalValue::AppendingLinkage:
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cerr << "AppendingLinkage is not supported by this target!\n";
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abort();
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case GlobalValue::LinkOnceLinkage:
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case GlobalValue::WeakLinkage:
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case GlobalValue::ExternalLinkage:
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emitArrayBound(name, GV);
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emitGlobalDirective(name);
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// TODO Use COMDAT groups for LinkOnceLinkage
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if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage()) {
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O << TAI->getWeakDefDirective() << name << "\n";
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}
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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::GhostLinkage:
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cerr << "Should not have any unmaterialized functions!\n";
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abort();
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case GlobalValue::DLLImportLinkage:
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cerr << "DLLImport linkage is not supported by this target!\n";
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abort();
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case GlobalValue::DLLExportLinkage:
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cerr << "DLLExport linkage is not supported by this target!\n";
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abort();
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default:
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assert(0 && "Unknown linkage type!");
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}
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EmitAlignment(Align, GV, 2);
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unsigned Size = TD->getTypePaddedSize(C->getType());
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if (GV->isThreadLocal()) {
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Size *= MaxThreads;
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}
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if (TAI->hasDotTypeDotSizeDirective()) {
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O << "\t.type " << name << ",@object\n";
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O << "\t.size " << name << "," << Size << "\n";
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}
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O << name << ":\n";
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EmitGlobalConstant(C);
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if (GV->isThreadLocal()) {
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for (unsigned i = 1; i < MaxThreads; ++i) {
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EmitGlobalConstant(C);
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}
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}
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if (Size < 4) {
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// The ABI requires that unsigned scalar types smaller than 32 bits
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// are are padded to 32 bits.
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EmitZeros(4 - Size);
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}
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// Mark the end of the global
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O << "\t.cc_bottom " << name << ".data\n";
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} else {
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if (GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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}
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}
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/// Emit the directives on the start of functions
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void XCoreAsmPrinter::
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emitFunctionStart(MachineFunction &MF)
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{
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// Print out the label for the function.
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const Function *F = MF.getFunction();
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SwitchToSection(TAI->SectionForGlobal(F));
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// Mark the start of the function
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O << "\t.cc_top " << CurrentFnName << ".function," << CurrentFnName << "\n";
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switch (F->getLinkage()) {
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default: assert(0 && "Unknown linkage type!");
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case Function::InternalLinkage: // Symbols default to internal.
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case Function::PrivateLinkage:
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break;
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case Function::ExternalLinkage:
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emitGlobalDirective(CurrentFnName);
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break;
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case Function::LinkOnceLinkage:
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case Function::WeakLinkage:
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// TODO Use COMDAT groups for LinkOnceLinkage
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O << TAI->getGlobalDirective() << CurrentFnName << "\n";
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O << TAI->getWeakDefDirective() << CurrentFnName << "\n";
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break;
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}
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// (1 << 1) byte aligned
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EmitAlignment(1, F, 1);
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if (TAI->hasDotTypeDotSizeDirective()) {
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O << "\t.type " << CurrentFnName << ",@function\n";
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}
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O << CurrentFnName << ":\n";
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}
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/// Emit the directives on the end of functions
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void XCoreAsmPrinter::
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emitFunctionEnd(MachineFunction &MF)
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{
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// Mark the end of the function
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O << "\t.cc_bottom " << CurrentFnName << ".function\n";
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}
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/// runOnMachineFunction - This uses the printMachineInstruction()
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/// method to print assembly for each instruction.
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///
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bool XCoreAsmPrinter::runOnMachineFunction(MachineFunction &MF)
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{
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this->MF = &MF;
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SetupMachineFunction(MF);
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// Print out constants referenced by the function
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EmitConstantPool(MF.getConstantPool());
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// Print out jump tables referenced by the function
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EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
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// Emit the function start directives
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emitFunctionStart(MF);
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// Emit pre-function debug information.
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DW->BeginFunction(&MF);
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// Print out code for the function.
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block.
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if (I != MF.begin()) {
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printBasicBlockLabel(I, true , true);
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O << '\n';
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}
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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// Print the assembly for the instruction.
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O << "\t";
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printMachineInstruction(II);
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}
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// Each Basic Block is separated by a newline
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O << '\n';
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}
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// Emit function end directives
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emitFunctionEnd(MF);
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// Emit post-function debug information.
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DW->EndFunction(&MF);
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// We didn't modify anything.
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return false;
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}
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void XCoreAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum)
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{
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printOperand(MI, opNum);
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if (MI->getOperand(opNum+1).isImm()
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&& MI->getOperand(opNum+1).getImm() == 0)
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return;
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O << "+";
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printOperand(MI, opNum+1);
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}
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void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
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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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if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
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O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
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else
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assert(0 && "not implemented");
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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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printBasicBlockLabel(MO.getMBB());
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break;
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case MachineOperand::MO_GlobalAddress:
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{
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const GlobalValue *GV = MO.getGlobal();
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O << Mang->getValueName(GV);
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if (GV->hasExternalWeakLinkage())
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ExtWeakSymbols.insert(GV);
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}
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break;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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break;
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case MachineOperand::MO_JumpTableIndex:
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O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
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<< '_' << MO.getIndex();
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break;
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default:
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assert(0 && "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,
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const char *ExtraCode) {
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printOperand(MI, OpNo);
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return false;
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}
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void XCoreAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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++EmittedInsts;
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// Check for mov mnemonic
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unsigned src, dst, srcSR, dstSR;
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if (TM.getInstrInfo()->isMoveInstr(*MI, src, dst, srcSR, dstSR)) {
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O << "\tmov ";
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O << TM.getRegisterInfo()->get(dst).AsmName;
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O << ", ";
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O << TM.getRegisterInfo()->get(src).AsmName;
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O << "\n";
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return;
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}
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if (printInstruction(MI)) {
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return;
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}
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assert(0 && "Unhandled instruction in asm writer!");
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}
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bool XCoreAsmPrinter::doInitialization(Module &M) {
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bool Result = AsmPrinter::doInitialization(M);
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if (!FileDirective.empty()) {
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emitFileDirective(FileDirective);
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}
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// Print out type strings for external functions here
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for (Module::const_iterator I = M.begin(), E = M.end();
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I != E; ++I) {
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if (I->isDeclaration() && !I->isIntrinsic()) {
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switch (I->getLinkage()) {
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default:
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assert(0 && "Unexpected linkage");
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case Function::ExternalWeakLinkage:
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ExtWeakSymbols.insert(I);
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// fallthrough
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case Function::ExternalLinkage:
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break;
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}
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}
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}
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// Emit initial debug information.
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DW = getAnalysisIfAvailable<DwarfWriter>();
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assert(DW && "Dwarf Writer is not available");
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DW->BeginModule(&M, getAnalysisIfAvailable<MachineModuleInfo>(),
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O, this, TAI);
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return Result;
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}
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bool XCoreAsmPrinter::doFinalization(Module &M) {
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// Print out module-level global variables.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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emitGlobal(I);
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}
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// Emit final debug information.
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DW->EndModule();
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return AsmPrinter::doFinalization(M);
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}
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