mirror of
https://github.com/c64scene-ar/llvm-6502.git
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33adcfb4d2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79777 91177308-0d34-0410-b5e6-96231b3b80d8
483 lines
16 KiB
C++
483 lines
16 KiB
C++
//===-- PIC16AsmPrinter.cpp - PIC16 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 PIC16 assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "PIC16AsmPrinter.h"
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#include "MCSectionPIC16.h"
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#include "PIC16MCAsmInfo.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineFrameInfo.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/MC/MCStreamer.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Mangler.h"
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#include <cstring>
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using namespace llvm;
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#include "PIC16GenAsmWriter.inc"
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PIC16AsmPrinter::PIC16AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
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const MCAsmInfo *T, bool V)
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: AsmPrinter(O, TM, T, V), DbgInfo(O, T) {
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PTLI = static_cast<PIC16TargetLowering*>(TM.getTargetLowering());
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PMAI = static_cast<const PIC16MCAsmInfo*>(T);
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PTOF = (PIC16TargetObjectFile*)&PTLI->getObjFileLowering();
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}
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bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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printInstruction(MI);
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return true;
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}
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/// runOnMachineFunction - This emits the frame section, autos section and
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/// assembly for each instruction. Also takes care of function begin debug
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/// directive and file begin debug directive (if required) for the function.
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///
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bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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this->MF = &MF;
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// This calls the base class function required to be called at beginning
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// of runOnMachineFunction.
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SetupMachineFunction(MF);
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// Get the mangled name.
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const Function *F = MF.getFunction();
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CurrentFnName = Mang->getMangledName(F);
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// Emit the function frame (args and temps).
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EmitFunctionFrame(MF);
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DbgInfo.BeginFunction(MF);
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// Emit the autos section of function.
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EmitAutos(CurrentFnName);
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// Now emit the instructions of function in its code section.
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const MCSection *fCodeSection =
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getObjFileLowering().getSectionForFunction(CurrentFnName);
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// Start the Code Section.
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O << "\n";
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OutStreamer.SwitchSection(fCodeSection);
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// Emit the frame address of the function at the beginning of code.
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O << "\tretlw low(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
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O << "\tretlw high(" << PAN::getFrameLabel(CurrentFnName) << ")\n";
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// Emit function start label.
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O << CurrentFnName << ":\n";
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DebugLoc CurDL;
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O << "\n";
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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);
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O << '\n';
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}
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// Print a basic block.
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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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// Emit the line directive if source line changed.
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const DebugLoc DL = II->getDebugLoc();
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if (!DL.isUnknown() && DL != CurDL) {
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DbgInfo.ChangeDebugLoc(MF, DL);
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CurDL = DL;
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}
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// Print the assembly for the instruction.
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printMachineInstruction(II);
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}
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}
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// Emit function end debug directives.
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DbgInfo.EndFunction(MF);
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return false; // we didn't modify anything.
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}
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// printOperand - print operand of insn.
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void PIC16AsmPrinter::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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llvm_unreachable("not implemented");
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return;
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case MachineOperand::MO_Immediate:
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O << (int)MO.getImm();
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return;
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case MachineOperand::MO_GlobalAddress: {
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std::string Sname = Mang->getMangledName(MO.getGlobal());
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// FIXME: currently we do not have a memcpy def coming in the module
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// by any chance, as we do not link in those as .bc lib. So these calls
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// are always external and it is safe to emit an extern.
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if (PAN::isMemIntrinsic(Sname)) {
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LibcallDecls.push_back(createESName(Sname));
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}
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O << Sname;
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break;
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}
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case MachineOperand::MO_ExternalSymbol: {
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const char *Sname = MO.getSymbolName();
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// If its a libcall name, record it to decls section.
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if (PAN::getSymbolTag(Sname) == PAN::LIBCALL) {
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LibcallDecls.push_back(Sname);
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}
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// Record a call to intrinsic to print the extern declaration for it.
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std::string Sym = Sname;
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if (PAN::isMemIntrinsic(Sym)) {
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Sym = PAN::addPrefix(Sym);
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LibcallDecls.push_back(createESName(Sym));
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}
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O << Sym;
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break;
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}
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case MachineOperand::MO_MachineBasicBlock:
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printBasicBlockLabel(MO.getMBB());
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return;
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default:
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llvm_unreachable(" Operand type not supported.");
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}
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}
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/// printCCOperand - Print the cond code operand.
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///
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void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
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int CC = (int)MI->getOperand(opNum).getImm();
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O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
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}
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// This function is used to sort the decls list.
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// should return true if s1 should come before s2.
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static bool is_before(const char *s1, const char *s2) {
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return strcmp(s1, s2) <= 0;
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}
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// This is used by list::unique below.
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// unique will filter out duplicates if it knows them.
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static bool is_duplicate(const char *s1, const char *s2) {
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return !strcmp(s1, s2);
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}
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/// printLibcallDecls - print the extern declarations for compiler
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/// intrinsics.
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///
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void PIC16AsmPrinter::printLibcallDecls() {
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// If no libcalls used, return.
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if (LibcallDecls.empty()) return;
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O << MAI->getCommentString() << "External decls for libcalls - BEGIN." <<"\n";
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// Remove duplicate entries.
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LibcallDecls.sort(is_before);
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LibcallDecls.unique(is_duplicate);
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for (std::list<const char*>::const_iterator I = LibcallDecls.begin();
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I != LibcallDecls.end(); I++) {
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O << MAI->getExternDirective() << *I << "\n";
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O << MAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
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O << MAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
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}
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O << MAI->getCommentString() << "External decls for libcalls - END." <<"\n";
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}
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/// doInitialization - Perfrom Module level initializations here.
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/// One task that we do here is to sectionize all global variables.
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/// The MemSelOptimizer pass depends on the sectionizing.
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///
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bool PIC16AsmPrinter::doInitialization(Module &M) {
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bool Result = AsmPrinter::doInitialization(M);
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// FIXME:: This is temporary solution to generate the include file.
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// The processor should be passed to llc as in input and the header file
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// should be generated accordingly.
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O << "\n\t#include P16F1937.INC\n";
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// Set the section names for all globals.
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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if (!I->isDeclaration() && !I->hasAvailableExternallyLinkage()) {
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const MCSection *S = getObjFileLowering().SectionForGlobal(I, Mang, TM);
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I->setSection(((const MCSectionPIC16*)S)->getName());
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}
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DbgInfo.BeginModule(M);
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EmitFunctionDecls(M);
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EmitUndefinedVars(M);
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EmitDefinedVars(M);
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EmitIData(M);
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EmitUData(M);
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EmitRomData(M);
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return Result;
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}
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/// Emit extern decls for functions imported from other modules, and emit
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/// global declarations for function defined in this module and which are
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/// available to other modules.
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///
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void PIC16AsmPrinter::EmitFunctionDecls(Module &M) {
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// Emit declarations for external functions.
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O <<"\n"<<MAI->getCommentString() << "Function Declarations - BEGIN." <<"\n";
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for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
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if (I->isIntrinsic())
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continue;
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std::string Name = Mang->getMangledName(I);
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if (Name.compare("@abort") == 0)
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continue;
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if (!I->isDeclaration() && !I->hasExternalLinkage())
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continue;
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// Do not emit memcpy, memset, and memmove here.
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// Calls to these routines can be generated in two ways,
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// 1. User calling the standard lib function
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// 2. Codegen generating these calls for llvm intrinsics.
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// In the first case a prototype is alread availale, while in
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// second case the call is via and externalsym and the prototype is missing.
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// So declarations for these are currently always getting printing by
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// tracking both kind of references in printInstrunction.
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if (I->isDeclaration() && PAN::isMemIntrinsic(Name)) continue;
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const char *directive = I->isDeclaration() ? MAI->getExternDirective() :
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MAI->getGlobalDirective();
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O << directive << Name << "\n";
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O << directive << PAN::getRetvalLabel(Name) << "\n";
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O << directive << PAN::getArgsLabel(Name) << "\n";
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}
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O << MAI->getCommentString() << "Function Declarations - END." <<"\n";
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}
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// Emit variables imported from other Modules.
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void PIC16AsmPrinter::EmitUndefinedVars(Module &M) {
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std::vector<const GlobalVariable*> Items = PTOF->ExternalVarDecls->Items;
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if (!Items.size()) return;
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O << "\n" << MAI->getCommentString() << "Imported Variables - BEGIN" << "\n";
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for (unsigned j = 0; j < Items.size(); j++) {
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O << MAI->getExternDirective() << Mang->getMangledName(Items[j]) << "\n";
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}
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O << MAI->getCommentString() << "Imported Variables - END" << "\n";
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}
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// Emit variables defined in this module and are available to other modules.
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void PIC16AsmPrinter::EmitDefinedVars(Module &M) {
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std::vector<const GlobalVariable*> Items = PTOF->ExternalVarDefs->Items;
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if (!Items.size()) return;
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O << "\n" << MAI->getCommentString() << "Exported Variables - BEGIN" << "\n";
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for (unsigned j = 0; j < Items.size(); j++) {
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O << MAI->getGlobalDirective() << Mang->getMangledName(Items[j]) << "\n";
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}
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O << MAI->getCommentString() << "Exported Variables - END" << "\n";
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}
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// Emit initialized data placed in ROM.
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void PIC16AsmPrinter::EmitRomData(Module &M) {
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// Print ROM Data section.
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const std::vector<PIC16Section*> &ROSections = PTOF->ROSections;
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for (unsigned i = 0; i < ROSections.size(); i++) {
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const std::vector<const GlobalVariable*> &Items = ROSections[i]->Items;
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if (!Items.size()) continue;
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O << "\n";
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OutStreamer.SwitchSection(PTOF->ROSections[i]->S_);
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for (unsigned j = 0; j < Items.size(); j++) {
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O << Mang->getMangledName(Items[j]);
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Constant *C = Items[j]->getInitializer();
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int AddrSpace = Items[j]->getType()->getAddressSpace();
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EmitGlobalConstant(C, AddrSpace);
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}
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}
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}
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bool PIC16AsmPrinter::doFinalization(Module &M) {
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printLibcallDecls();
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EmitRemainingAutos();
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DbgInfo.EndModule(M);
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O << "\n\t" << "END\n";
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return AsmPrinter::doFinalization(M);
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}
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void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
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const Function *F = MF.getFunction();
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std::string FuncName = Mang->getMangledName(F);
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const TargetData *TD = TM.getTargetData();
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// Emit the data section name.
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O << "\n";
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const MCSection *fPDataSection =
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getObjFileLowering().getSectionForFunctionFrame(CurrentFnName);
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OutStreamer.SwitchSection(fPDataSection);
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// Emit function frame label
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O << PAN::getFrameLabel(CurrentFnName) << ":\n";
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const Type *RetType = F->getReturnType();
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unsigned RetSize = 0;
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if (RetType->getTypeID() != Type::VoidTyID)
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RetSize = TD->getTypeAllocSize(RetType);
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//Emit function return value space
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// FIXME: Do not emit RetvalLable when retsize is zero. To do this
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// we will need to avoid printing a global directive for Retval label
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// in emitExternandGloblas.
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if(RetSize > 0)
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O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
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else
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O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
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// Emit variable to hold the space for function arguments
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unsigned ArgSize = 0;
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for (Function::const_arg_iterator argi = F->arg_begin(),
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arge = F->arg_end(); argi != arge ; ++argi) {
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const Type *Ty = argi->getType();
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ArgSize += TD->getTypeAllocSize(Ty);
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}
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O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
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// Emit temporary space
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int TempSize = PTLI->GetTmpSize();
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if (TempSize > 0)
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O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize << '\n';
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}
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void PIC16AsmPrinter::EmitIData(Module &M) {
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// Print all IDATA sections.
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const std::vector<PIC16Section*> &IDATASections = PTOF->IDATASections;
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for (unsigned i = 0; i < IDATASections.size(); i++) {
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O << "\n";
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if (IDATASections[i]->S_->getName().find("llvm.") != std::string::npos)
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continue;
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OutStreamer.SwitchSection(IDATASections[i]->S_);
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std::vector<const GlobalVariable*> Items = IDATASections[i]->Items;
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for (unsigned j = 0; j < Items.size(); j++) {
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std::string Name = Mang->getMangledName(Items[j]);
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Constant *C = Items[j]->getInitializer();
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int AddrSpace = Items[j]->getType()->getAddressSpace();
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O << Name;
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EmitGlobalConstant(C, AddrSpace);
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}
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}
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}
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void PIC16AsmPrinter::EmitUData(Module &M) {
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const TargetData *TD = TM.getTargetData();
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// Print all BSS sections.
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const std::vector<PIC16Section*> &BSSSections = PTOF->BSSSections;
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for (unsigned i = 0; i < BSSSections.size(); i++) {
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O << "\n";
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OutStreamer.SwitchSection(BSSSections[i]->S_);
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std::vector<const GlobalVariable*> Items = BSSSections[i]->Items;
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for (unsigned j = 0; j < Items.size(); j++) {
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std::string Name = Mang->getMangledName(Items[j]);
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Constant *C = Items[j]->getInitializer();
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const Type *Ty = C->getType();
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unsigned Size = TD->getTypeAllocSize(Ty);
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O << Name << " RES " << Size << "\n";
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}
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}
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}
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void PIC16AsmPrinter::EmitAutos(std::string FunctName) {
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// Section names for all globals are already set.
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const TargetData *TD = TM.getTargetData();
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// Now print Autos section for this function.
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std::string SectionName = PAN::getAutosSectionName(FunctName);
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const std::vector<PIC16Section*> &AutosSections = PTOF->AutosSections;
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for (unsigned i = 0; i < AutosSections.size(); i++) {
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O << "\n";
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if (AutosSections[i]->S_->getName() == SectionName) {
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// Set the printing status to true
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AutosSections[i]->setPrintedStatus(true);
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OutStreamer.SwitchSection(AutosSections[i]->S_);
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const std::vector<const GlobalVariable*> &Items = AutosSections[i]->Items;
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for (unsigned j = 0; j < Items.size(); j++) {
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std::string VarName = Mang->getMangledName(Items[j]);
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Constant *C = Items[j]->getInitializer();
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const Type *Ty = C->getType();
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unsigned Size = TD->getTypeAllocSize(Ty);
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// Emit memory reserve directive.
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O << VarName << " RES " << Size << "\n";
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}
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break;
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}
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}
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}
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// Print autos that were not printed during the code printing of functions.
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// As the functions might themselves would have got deleted by the optimizer.
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void PIC16AsmPrinter::EmitRemainingAutos() {
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const TargetData *TD = TM.getTargetData();
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// Now print Autos section for this function.
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std::vector <PIC16Section *>AutosSections = PTOF->AutosSections;
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for (unsigned i = 0; i < AutosSections.size(); i++) {
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// if the section is already printed then don't print again
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if (AutosSections[i]->isPrinted())
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continue;
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// Set status as printed
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AutosSections[i]->setPrintedStatus(true);
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O << "\n";
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OutStreamer.SwitchSection(AutosSections[i]->S_);
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const std::vector<const GlobalVariable*> &Items = AutosSections[i]->Items;
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for (unsigned j = 0; j < Items.size(); j++) {
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std::string VarName = Mang->getMangledName(Items[j]);
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Constant *C = Items[j]->getInitializer();
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const Type *Ty = C->getType();
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unsigned Size = TD->getTypeAllocSize(Ty);
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// Emit memory reserve directive.
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O << VarName << " RES " << Size << "\n";
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}
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}
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}
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extern "C" void LLVMInitializePIC16AsmPrinter() {
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RegisterAsmPrinter<PIC16AsmPrinter> X(ThePIC16Target);
|
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}
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