llvm-6502/lib/Target/PIC16/AsmPrinter/PIC16AsmPrinter.cpp
Dan Gohman d858e90f03 Use const qualifiers with TargetLowering. This eliminates several
const_casts, and it reinforces the design of the Target classes being
immutable.

SelectionDAGISel::IsLegalToFold is now a static member function, because
PIC16 uses it in an unconventional way. There is more room for API
cleanup here.

And PIC16's AsmPrinter no longer uses TargetLowering.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101635 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-17 15:26:15 +00:00

513 lines
16 KiB
C++

//===-- PIC16AsmPrinter.cpp - PIC16 LLVM assembly writer ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to PIC16 assembly language.
//
//===----------------------------------------------------------------------===//
#include "PIC16ABINames.h"
#include "PIC16AsmPrinter.h"
#include "PIC16Section.h"
#include "PIC16MCAsmInfo.h"
#include "PIC16MachineFunctionInfo.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SmallString.h"
#include <cstring>
using namespace llvm;
#include "PIC16GenAsmWriter.inc"
PIC16AsmPrinter::PIC16AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), DbgInfo(Streamer, TM.getMCAsmInfo()) {
PMAI = static_cast<const PIC16MCAsmInfo*>(TM.getMCAsmInfo());
PTOF = &getObjFileLowering();
}
void PIC16AsmPrinter::EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
printInstruction(MI, OS);
OutStreamer.EmitRawText(OS.str());
}
static int getFunctionColor(const Function *F) {
if (F->hasSection()) {
std::string Sectn = F->getSection();
std::string StrToFind = "Overlay=";
std::string::size_type Pos = Sectn.find(StrToFind);
// Retreive the color number if the key is found.
if (Pos != std::string::npos) {
Pos += StrToFind.length();
std::string Color = "";
char c = Sectn.at(Pos);
// A Color can only consist of digits.
while (c >= '0' && c<= '9') {
Color.append(1,c);
Pos++;
if (Pos >= Sectn.length())
break;
c = Sectn.at(Pos);
}
return atoi(Color.c_str());
}
}
// Color was not set for function, so return -1.
return -1;
}
// Color the Auto section of the given function.
void PIC16AsmPrinter::ColorAutoSection(const Function *F) {
std::string SectionName = PAN::getAutosSectionName(CurrentFnSym->getName());
PIC16Section* Section = PTOF->findPIC16Section(SectionName);
if (Section != NULL) {
int Color = getFunctionColor(F);
if (Color >= 0)
Section->setColor(Color);
}
}
/// runOnMachineFunction - This emits the frame section, autos section and
/// assembly for each instruction. Also takes care of function begin debug
/// directive and file begin debug directive (if required) for the function.
///
bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
// This calls the base class function required to be called at beginning
// of runOnMachineFunction.
SetupMachineFunction(MF);
// Put the color information from function to its auto section.
const Function *F = MF.getFunction();
ColorAutoSection(F);
// Emit the function frame (args and temps).
EmitFunctionFrame(MF);
DbgInfo.BeginFunction(MF);
// Now emit the instructions of function in its code section.
const MCSection *fCodeSection =
getObjFileLowering().SectionForCode(CurrentFnSym->getName(),
PAN::isISR(F->getSection()));
// Start the Code Section.
OutStreamer.SwitchSection(fCodeSection);
// Emit the frame address of the function at the beginning of code.
OutStreamer.EmitRawText("\tretlw low(" +
Twine(PAN::getFrameLabel(CurrentFnSym->getName())) +
")");
OutStreamer.EmitRawText("\tretlw high(" +
Twine(PAN::getFrameLabel(CurrentFnSym->getName())) +
")");
// Emit function start label.
OutStreamer.EmitLabel(CurrentFnSym);
DebugLoc CurDL;
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
// Print a label for the basic block.
if (I != MF.begin())
EmitBasicBlockStart(I);
// Print a basic block.
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Emit the line directive if source line changed.
DebugLoc DL = II->getDebugLoc();
if (!DL.isUnknown() && DL != CurDL) {
DbgInfo.ChangeDebugLoc(MF, DL);
CurDL = DL;
}
// Print the assembly for the instruction.
EmitInstruction(II);
}
}
// Emit function end debug directives.
DbgInfo.EndFunction(MF);
return false; // we didn't modify anything.
}
// printOperand - print operand of insn.
void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(opNum);
const Function *F = MI->getParent()->getParent()->getFunction();
switch (MO.getType()) {
case MachineOperand::MO_Register:
{
// For indirect load/store insns, the fsr name is printed as INDF.
std::string RegName = getRegisterName(MO.getReg());
if ((MI->getOpcode() == PIC16::load_indirect) ||
(MI->getOpcode() == PIC16::store_indirect))
RegName.replace (0, 3, "INDF");
O << RegName;
}
return;
case MachineOperand::MO_Immediate:
O << (int)MO.getImm();
return;
case MachineOperand::MO_GlobalAddress: {
MCSymbol *Sym = Mang->getSymbol(MO.getGlobal());
// FIXME: currently we do not have a memcpy def coming in the module
// by any chance, as we do not link in those as .bc lib. So these calls
// are always external and it is safe to emit an extern.
if (PAN::isMemIntrinsic(Sym->getName()))
LibcallDecls.insert(Sym->getName());
O << *Sym;
break;
}
case MachineOperand::MO_ExternalSymbol: {
const char *Sname = MO.getSymbolName();
std::string Printname = Sname;
// Intrinsic stuff needs to be renamed if we are printing IL fn.
if (PAN::isIntrinsicStuff(Printname)) {
if (PAN::isISR(F->getSection())) {
Printname = PAN::Rename(Sname);
}
// Record these decls, we need to print them in asm as extern.
LibcallDecls.insert(Printname);
}
O << Printname;
break;
}
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
return;
default:
llvm_unreachable(" Operand type not supported.");
}
}
/// printCCOperand - Print the cond code operand.
///
void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
int CC = (int)MI->getOperand(opNum).getImm();
O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
}
/// printLibcallDecls - print the extern declarations for compiler
/// intrinsics.
///
void PIC16AsmPrinter::printLibcallDecls() {
// If no libcalls used, return.
if (LibcallDecls.empty()) return;
OutStreamer.AddComment("External decls for libcalls - BEGIN");
OutStreamer.AddBlankLine();
for (std::set<std::string>::const_iterator I = LibcallDecls.begin(),
E = LibcallDecls.end(); I != E; I++)
OutStreamer.EmitRawText(MAI->getExternDirective() + Twine(*I));
OutStreamer.AddComment("External decls for libcalls - END");
OutStreamer.AddBlankLine();
}
/// doInitialization - Perform Module level initializations here.
/// One task that we do here is to sectionize all global variables.
/// The MemSelOptimizer pass depends on the sectionizing.
///
bool PIC16AsmPrinter::doInitialization(Module &M) {
bool Result = AsmPrinter::doInitialization(M);
// Every asmbly contains these std headers.
OutStreamer.EmitRawText(StringRef("\n#include p16f1xxx.inc"));
OutStreamer.EmitRawText(StringRef("#include stdmacros.inc"));
// Set the section names for all globals.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
// Record External Var Decls.
if (I->isDeclaration()) {
ExternalVarDecls.push_back(I);
continue;
}
// Record Exteranl Var Defs.
if (I->hasExternalLinkage() || I->hasCommonLinkage()) {
ExternalVarDefs.push_back(I);
}
// Sectionify actual data.
if (!I->hasAvailableExternallyLinkage()) {
const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
I->setSection(((const PIC16Section *)S)->getName());
}
}
DbgInfo.BeginModule(M);
EmitFunctionDecls(M);
EmitUndefinedVars(M);
EmitDefinedVars(M);
EmitIData(M);
EmitUData(M);
EmitRomData(M);
EmitSharedUdata(M);
EmitUserSections(M);
return Result;
}
/// Emit extern decls for functions imported from other modules, and emit
/// global declarations for function defined in this module and which are
/// available to other modules.
///
void PIC16AsmPrinter::EmitFunctionDecls(Module &M) {
// Emit declarations for external functions.
OutStreamer.AddComment("Function Declarations - BEGIN");
OutStreamer.AddBlankLine();
for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
if (I->isIntrinsic() || I->getName() == "@abort")
continue;
if (!I->isDeclaration() && !I->hasExternalLinkage())
continue;
MCSymbol *Sym = Mang->getSymbol(I);
// Do not emit memcpy, memset, and memmove here.
// Calls to these routines can be generated in two ways,
// 1. User calling the standard lib function
// 2. Codegen generating these calls for llvm intrinsics.
// In the first case a prototype is alread availale, while in
// second case the call is via and externalsym and the prototype is missing.
// So declarations for these are currently always getting printing by
// tracking both kind of references in printInstrunction.
if (I->isDeclaration() && PAN::isMemIntrinsic(Sym->getName())) continue;
const char *directive = I->isDeclaration() ? MAI->getExternDirective() :
MAI->getGlobalDirective();
OutStreamer.EmitRawText(directive + Twine(Sym->getName()));
OutStreamer.EmitRawText(directive +
Twine(PAN::getRetvalLabel(Sym->getName())));
OutStreamer.EmitRawText(directive +
Twine(PAN::getArgsLabel(Sym->getName())));
}
OutStreamer.AddComment("Function Declarations - END");
OutStreamer.AddBlankLine();
}
// Emit variables imported from other Modules.
void PIC16AsmPrinter::EmitUndefinedVars(Module &M) {
std::vector<const GlobalVariable*> Items = ExternalVarDecls;
if (!Items.size()) return;
OutStreamer.AddComment("Imported Variables - BEGIN");
OutStreamer.AddBlankLine();
for (unsigned j = 0; j < Items.size(); j++)
OutStreamer.EmitRawText(MAI->getExternDirective() +
Twine(Mang->getSymbol(Items[j])->getName()));
OutStreamer.AddComment("Imported Variables - END");
OutStreamer.AddBlankLine();
}
// Emit variables defined in this module and are available to other modules.
void PIC16AsmPrinter::EmitDefinedVars(Module &M) {
std::vector<const GlobalVariable*> Items = ExternalVarDefs;
if (!Items.size()) return;
OutStreamer.AddComment("Exported Variables - BEGIN");
OutStreamer.AddBlankLine();
for (unsigned j = 0; j < Items.size(); j++)
OutStreamer.EmitRawText(MAI->getGlobalDirective() +
Twine(Mang->getSymbol(Items[j])->getName()));
OutStreamer.AddComment("Exported Variables - END");
OutStreamer.AddBlankLine();
}
// Emit initialized data placed in ROM.
void PIC16AsmPrinter::EmitRomData(Module &M) {
EmitSingleSection(PTOF->ROMDATASection());
}
// Emit Shared section udata.
void PIC16AsmPrinter::EmitSharedUdata(Module &M) {
EmitSingleSection(PTOF->SHAREDUDATASection());
}
bool PIC16AsmPrinter::doFinalization(Module &M) {
EmitAllAutos(M);
printLibcallDecls();
DbgInfo.EndModule(M);
OutStreamer.EmitRawText(StringRef("\tEND"));
return AsmPrinter::doFinalization(M);
}
void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
const Function *F = MF.getFunction();
const TargetData *TD = TM.getTargetData();
PIC16MachineFunctionInfo *FuncInfo = MF.getInfo<PIC16MachineFunctionInfo>();
// Emit the data section name.
PIC16Section *fPDataSection =
const_cast<PIC16Section *>(getObjFileLowering().
SectionForFrame(CurrentFnSym->getName()));
fPDataSection->setColor(getFunctionColor(F));
OutStreamer.SwitchSection(fPDataSection);
// Emit function frame label
OutStreamer.EmitRawText(PAN::getFrameLabel(CurrentFnSym->getName()) +
Twine(":"));
const Type *RetType = F->getReturnType();
unsigned RetSize = 0;
if (RetType->getTypeID() != Type::VoidTyID)
RetSize = TD->getTypeAllocSize(RetType);
//Emit function return value space
// FIXME: Do not emit RetvalLable when retsize is zero. To do this
// we will need to avoid printing a global directive for Retval label
// in emitExternandGloblas.
if(RetSize > 0)
OutStreamer.EmitRawText(PAN::getRetvalLabel(CurrentFnSym->getName()) +
Twine(" RES ") + Twine(RetSize));
else
OutStreamer.EmitRawText(PAN::getRetvalLabel(CurrentFnSym->getName()) +
Twine(":"));
// Emit variable to hold the space for function arguments
unsigned ArgSize = 0;
for (Function::const_arg_iterator argi = F->arg_begin(),
arge = F->arg_end(); argi != arge ; ++argi) {
const Type *Ty = argi->getType();
ArgSize += TD->getTypeAllocSize(Ty);
}
OutStreamer.EmitRawText(PAN::getArgsLabel(CurrentFnSym->getName()) +
Twine(" RES ") + Twine(ArgSize));
// Emit temporary space
int TempSize = FuncInfo->getTmpSize();
if (TempSize > 0)
OutStreamer.EmitRawText(PAN::getTempdataLabel(CurrentFnSym->getName()) +
Twine(" RES ") + Twine(TempSize));
}
void PIC16AsmPrinter::EmitInitializedDataSection(const PIC16Section *S) {
/// Emit Section header.
OutStreamer.SwitchSection(S);
std::vector<const GlobalVariable*> Items = S->Items;
for (unsigned j = 0; j < Items.size(); j++) {
Constant *C = Items[j]->getInitializer();
int AddrSpace = Items[j]->getType()->getAddressSpace();
OutStreamer.EmitRawText(Mang->getSymbol(Items[j])->getName());
EmitGlobalConstant(C, AddrSpace);
}
}
// Print all IDATA sections.
void PIC16AsmPrinter::EmitIData(Module &M) {
EmitSectionList (M, PTOF->IDATASections());
}
void PIC16AsmPrinter::
EmitUninitializedDataSection(const PIC16Section *S) {
const TargetData *TD = TM.getTargetData();
OutStreamer.SwitchSection(S);
std::vector<const GlobalVariable*> Items = S->Items;
for (unsigned j = 0; j < Items.size(); j++) {
Constant *C = Items[j]->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypeAllocSize(Ty);
OutStreamer.EmitRawText(Mang->getSymbol(Items[j])->getName() +
Twine(" RES ") + Twine(Size));
}
}
// Print all UDATA sections.
void PIC16AsmPrinter::EmitUData(Module &M) {
EmitSectionList (M, PTOF->UDATASections());
}
// Print all USER sections.
void PIC16AsmPrinter::EmitUserSections(Module &M) {
EmitSectionList (M, PTOF->USERSections());
}
// Print all AUTO sections.
void PIC16AsmPrinter::EmitAllAutos(Module &M) {
EmitSectionList (M, PTOF->AUTOSections());
}
extern "C" void LLVMInitializePIC16AsmPrinter() {
RegisterAsmPrinter<PIC16AsmPrinter> X(ThePIC16Target);
}
// Emit one data section using correct section emitter based on section type.
void PIC16AsmPrinter::EmitSingleSection(const PIC16Section *S) {
if (S == NULL) return;
switch (S->getType()) {
default: llvm_unreachable ("unknow user section type");
case UDATA:
case UDATA_SHR:
case UDATA_OVR:
EmitUninitializedDataSection(S);
break;
case IDATA:
case ROMDATA:
EmitInitializedDataSection(S);
break;
}
}
// Emit a list of sections.
void PIC16AsmPrinter::
EmitSectionList(Module &M, const std::vector<PIC16Section *> &SList) {
for (unsigned i = 0; i < SList.size(); i++) {
// Exclude llvm specific metadata sections.
if (SList[i]->getName().find("llvm.") != std::string::npos)
continue;
OutStreamer.AddBlankLine();
EmitSingleSection(SList[i]);
}
}