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llvm-project/llvm/lib/Target/PIC16/PIC16AsmPrinter.cpp

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//===-- 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 "PIC16AsmPrinter.h"
#include "PIC16TargetAsmInfo.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
using namespace llvm;
#include "PIC16GenAsmWriter.inc"
PIC16AsmPrinter::PIC16AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
const TargetAsmInfo *T, bool V)
: AsmPrinter(O, TM, T, V), DbgInfo(O, T) {
PTLI = static_cast<const PIC16TargetLowering*>(TM.getTargetLowering());
PTAI = static_cast<const PIC16TargetAsmInfo*>(T);
PTOF = (PIC16TargetObjectFile*)&PTLI->getObjFileLowering();
}
bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
printInstruction(MI);
return true;
}
/// 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->MF = &MF;
// This calls the base class function required to be called at beginning
// of runOnMachineFunction.
SetupMachineFunction(MF);
// Get the mangled name.
const Function *F = MF.getFunction();
CurrentFnName = Mang->getMangledName(F);
// Emit the function frame (args and temps).
EmitFunctionFrame(MF);
DbgInfo.BeginFunction(MF);
// Emit the autos section of function.
EmitAutos(CurrentFnName);
// Now emit the instructions of function in its code section.
std::string T = PAN::getCodeSectionName(CurrentFnName);
const char *codeSection = T.c_str();
const MCSection *fCodeSection =
getObjFileLowering().getOrCreateSection(codeSection, false,
SectionKind::getText());
// Start the Code Section.
O << "\n";
SwitchToSection(fCodeSection);
// Emit the frame address of the function at the beginning of code.
O << "\tretlw low(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
O << "\tretlw high(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
// Emit function start label.
O << CurrentFnName << ":\n";
DebugLoc CurDL;
O << "\n";
// 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()) {
printBasicBlockLabel(I, true);
O << '\n';
}
// 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.
const DebugLoc DL = II->getDebugLoc();
if (!DL.isUnknown() && DL != CurDL) {
DbgInfo.ChangeDebugLoc(MF, DL);
CurDL = DL;
}
// Print the assembly for the instruction.
printMachineInstruction(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) {
const MachineOperand &MO = MI->getOperand(opNum);
switch (MO.getType()) {
case MachineOperand::MO_Register:
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
else
llvm_unreachable("not implemented");
return;
case MachineOperand::MO_Immediate:
O << (int)MO.getImm();
return;
case MachineOperand::MO_GlobalAddress: {
std::string Sname = Mang->getMangledName(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(Sname)) {
LibcallDecls.push_back(createESName(Sname));
}
O << Sname;
break;
}
case MachineOperand::MO_ExternalSymbol: {
const char *Sname = MO.getSymbolName();
// If its a libcall name, record it to decls section.
if (PAN::getSymbolTag(Sname) == PAN::LIBCALL) {
LibcallDecls.push_back(Sname);
}
// Record a call to intrinsic to print the extern declaration for it.
std::string Sym = Sname;
if (PAN::isMemIntrinsic(Sym)) {
Sym = PAN::addPrefix(Sym);
LibcallDecls.push_back(createESName(Sym));
}
O << Sym;
break;
}
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB());
return;
default:
llvm_unreachable(" Operand type not supported.");
}
}
/// printCCOperand - Print the cond code operand.
///
void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
int CC = (int)MI->getOperand(opNum).getImm();
O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
}
// This function is used to sort the decls list.
// should return true if s1 should come before s2.
static bool is_before(const char *s1, const char *s2) {
std::string str1 = s1;
std::string str2 = s2;
int i = str1.compare(str2);
// Return true if s1 is smaller or equal.
if (i <= 0) return true;
// false if s1 should come after s2.
return false;
}
// This is used by list::unique below.
// unique will filter out duplicates if it knows them.
static bool is_duplicate(const char *s1, const char *s2) {
std::string str1 = s1;
std::string str2 = s2;
return str1 == str2;
}
/// printLibcallDecls - print the extern declarations for compiler
/// intrinsics.
///
void PIC16AsmPrinter::printLibcallDecls(void) {
// If no libcalls used, return.
if (LibcallDecls.empty()) return;
O << TAI->getCommentString() << "External decls for libcalls - BEGIN." <<"\n";
// Remove duplicate entries.
LibcallDecls.sort(is_before);
LibcallDecls.unique(is_duplicate);
for (std::list<const char*>::const_iterator I = LibcallDecls.begin();
I != LibcallDecls.end(); I++) {
O << TAI->getExternDirective() << *I << "\n";
O << TAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
O << TAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
}
O << TAI->getCommentString() << "External decls for libcalls - END." <<"\n";
}
/// doInitialization - Perfrom 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);
// FIXME:: This is temporary solution to generate the include file.
// The processor should be passed to llc as in input and the header file
// should be generated accordingly.
O << "\n\t#include P16F1937.INC\n";
// Set the section names for all globals.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (!I->isDeclaration() && !I->hasAvailableExternallyLinkage())
I->setSection(getObjFileLowering().
SectionForGlobal(I, Mang,TM)->getName());
DbgInfo.BeginModule(M);
EmitFunctionDecls(M);
EmitUndefinedVars(M);
EmitDefinedVars(M);
EmitIData(M);
EmitUData(M);
EmitRomData(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.
O <<"\n"<<TAI->getCommentString() << "Function Declarations - BEGIN." <<"\n";
for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
if (I->isIntrinsic())
continue;
std::string Name = Mang->getMangledName(I);
if (Name.compare("@abort") == 0)
continue;
if (!I->isDeclaration() && !I->hasExternalLinkage())
continue;
// 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(Name)) continue;
const char *directive = I->isDeclaration() ? TAI->getExternDirective() :
TAI->getGlobalDirective();
O << directive << Name << "\n";
O << directive << PAN::getRetvalLabel(Name) << "\n";
O << directive << PAN::getArgsLabel(Name) << "\n";
}
O << TAI->getCommentString() << "Function Declarations - END." <<"\n";
}
// Emit variables imported from other Modules.
void PIC16AsmPrinter::EmitUndefinedVars(Module &M) {
std::vector<const GlobalVariable*> Items = PTOF->ExternalVarDecls->Items;
if (!Items.size()) return;
O << "\n" << TAI->getCommentString() << "Imported Variables - BEGIN" << "\n";
for (unsigned j = 0; j < Items.size(); j++) {
O << TAI->getExternDirective() << Mang->getMangledName(Items[j]) << "\n";
}
O << TAI->getCommentString() << "Imported Variables - END" << "\n";
}
// Emit variables defined in this module and are available to other modules.
void PIC16AsmPrinter::EmitDefinedVars(Module &M) {
std::vector<const GlobalVariable*> Items = PTOF->ExternalVarDefs->Items;
if (!Items.size()) return;
O << "\n" << TAI->getCommentString() << "Exported Variables - BEGIN" << "\n";
for (unsigned j = 0; j < Items.size(); j++) {
O << TAI->getGlobalDirective() << Mang->getMangledName(Items[j]) << "\n";
}
O << TAI->getCommentString() << "Exported Variables - END" << "\n";
}
// Emit initialized data placed in ROM.
void PIC16AsmPrinter::EmitRomData(Module &M) {
// Print ROM Data section.
const std::vector<PIC16Section*> &ROSections = PTOF->ROSections;
for (unsigned i = 0; i < ROSections.size(); i++) {
const std::vector<const GlobalVariable*> &Items = ROSections[i]->Items;
if (!Items.size()) continue;
O << "\n";
SwitchToSection(PTOF->ROSections[i]->S_);
for (unsigned j = 0; j < Items.size(); j++) {
O << Mang->getMangledName(Items[j]);
Constant *C = Items[j]->getInitializer();
int AddrSpace = Items[j]->getType()->getAddressSpace();
EmitGlobalConstant(C, AddrSpace);
}
}
}
bool PIC16AsmPrinter::doFinalization(Module &M) {
printLibcallDecls();
EmitRemainingAutos();
DbgInfo.EndModule(M);
O << "\n\t" << "END\n";
return AsmPrinter::doFinalization(M);
}
void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
const Function *F = MF.getFunction();
std::string FuncName = Mang->getMangledName(F);
const TargetData *TD = TM.getTargetData();
// Emit the data section name.
O << "\n";
std::string T = PAN::getFrameSectionName(CurrentFnName);
const char *SectionName = T.c_str();
const MCSection *fPDataSection =
getObjFileLowering().getOrCreateSection(SectionName, false,
SectionKind::getDataRel());
SwitchToSection(fPDataSection);
// Emit function frame label
O << PAN::getFrameLabel(CurrentFnName) << ":\n";
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)
O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
else
O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
// 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);
}
O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
// Emit temporary space
int TempSize = PTLI->GetTmpSize();
if (TempSize > 0)
O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize << '\n';
}
void PIC16AsmPrinter::EmitIData(Module &M) {
// Print all IDATA sections.
const std::vector<PIC16Section*> &IDATASections = PTOF->IDATASections;
for (unsigned i = 0; i < IDATASections.size(); i++) {
O << "\n";
if (IDATASections[i]->S_->getName().find("llvm.") != std::string::npos)
continue;
SwitchToSection(IDATASections[i]->S_);
std::vector<const GlobalVariable*> Items = IDATASections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string Name = Mang->getMangledName(Items[j]);
Constant *C = Items[j]->getInitializer();
int AddrSpace = Items[j]->getType()->getAddressSpace();
O << Name;
EmitGlobalConstant(C, AddrSpace);
}
}
}
void PIC16AsmPrinter::EmitUData(Module &M) {
const TargetData *TD = TM.getTargetData();
// Print all BSS sections.
const std::vector<PIC16Section*> &BSSSections = PTOF->BSSSections;
for (unsigned i = 0; i < BSSSections.size(); i++) {
O << "\n";
SwitchToSection(BSSSections[i]->S_);
std::vector<const GlobalVariable*> Items = BSSSections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string Name = Mang->getMangledName(Items[j]);
Constant *C = Items[j]->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypeAllocSize(Ty);
O << Name << " RES " << Size << "\n";
}
}
}
void PIC16AsmPrinter::EmitAutos(std::string FunctName) {
// Section names for all globals are already set.
const TargetData *TD = TM.getTargetData();
// Now print Autos section for this function.
std::string SectionName = PAN::getAutosSectionName(FunctName);
const std::vector<PIC16Section*> &AutosSections = PTOF->AutosSections;
for (unsigned i = 0; i < AutosSections.size(); i++) {
O << "\n";
if (AutosSections[i]->S_->getName() == SectionName) {
// Set the printing status to true
AutosSections[i]->setPrintedStatus(true);
SwitchToSection(AutosSections[i]->S_);
const std::vector<const GlobalVariable*> &Items = AutosSections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string VarName = Mang->getMangledName(Items[j]);
Constant *C = Items[j]->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypeAllocSize(Ty);
// Emit memory reserve directive.
O << VarName << " RES " << Size << "\n";
}
break;
}
}
}
// Print autos that were not printed during the code printing of functions.
// As the functions might themselves would have got deleted by the optimizer.
void PIC16AsmPrinter::EmitRemainingAutos() {
const TargetData *TD = TM.getTargetData();
// Now print Autos section for this function.
std::vector <PIC16Section *>AutosSections = PTOF->AutosSections;
for (unsigned i = 0; i < AutosSections.size(); i++) {
// if the section is already printed then don't print again
if (AutosSections[i]->isPrinted())
continue;
// Set status as printed
AutosSections[i]->setPrintedStatus(true);
O << "\n";
SwitchToSection(AutosSections[i]->S_);
const std::vector<const GlobalVariable*> &Items = AutosSections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string VarName = Mang->getMangledName(Items[j]);
Constant *C = Items[j]->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypeAllocSize(Ty);
// Emit memory reserve directive.
O << VarName << " RES " << Size << "\n";
}
}
}
extern "C" void LLVMInitializePIC16Target() {
// Register the targets
RegisterTargetMachine<PIC16TargetMachine> A(ThePIC16Target);
RegisterTargetMachine<CooperTargetMachine> B(TheCooperTarget);
RegisterAsmPrinter<PIC16AsmPrinter> C(ThePIC16Target);
RegisterAsmPrinter<PIC16AsmPrinter> D(TheCooperTarget);
}
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