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vectors needlessly, doxygenify comments, improve constness, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76585 91177308-0d34-0410-b5e6-96231b3b80d8
422 lines
14 KiB
C++
422 lines
14 KiB
C++
//===-- PIC16TargetAsmInfo.cpp - PIC16 asm properties ---------------------===//
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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 the declarations of the PIC16TargetAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "PIC16TargetAsmInfo.h"
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#include "PIC16TargetMachine.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/DerivedTypes.h"
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using namespace llvm;
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PIC16TargetAsmInfo::
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PIC16TargetAsmInfo(const PIC16TargetMachine &TM)
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: TargetAsmInfo(TM) {
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CommentString = ";";
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GlobalPrefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
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GlobalDirective = "\tglobal\t";
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ExternDirective = "\textern\t";
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Data8bitsDirective = " db ";
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Data16bitsDirective = " dw ";
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Data32bitsDirective = " dl ";
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Data64bitsDirective = NULL;
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RomData8bitsDirective = " dw ";
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RomData16bitsDirective = " rom_di ";
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RomData32bitsDirective = " rom_dl ";
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ZeroDirective = NULL;
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AsciiDirective = " dt ";
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AscizDirective = NULL;
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BSSSection_ = getNamedSection("udata.# UDATA",
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SectionFlags::Writeable | SectionFlags::BSS);
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ReadOnlySection = getNamedSection("romdata.# ROMDATA", SectionFlags::None);
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DataSection = getNamedSection("idata.# IDATA", SectionFlags::Writeable);
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SwitchToSectionDirective = "";
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// Need because otherwise a .text symbol is emitted by DwarfWriter
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// in BeginModule, and gpasm cribbs for that .text symbol.
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TextSection = getUnnamedSection("", SectionFlags::Code);
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PIC16Section *ROSection = new PIC16Section(getReadOnlySection());
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ROSections.push_back(ROSection);
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ExternalVarDecls = new PIC16Section(getNamedSection("ExternalVarDecls"));
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ExternalVarDefs = new PIC16Section(getNamedSection("ExternalVarDefs"));
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// Set it to false because we weed to generate c file name and not bc file
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// name.
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HasSingleParameterDotFile = false;
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}
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const char *PIC16TargetAsmInfo::getRomDirective(unsigned Size) const {
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switch (Size) {
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case 8: return RomData8bitsDirective;
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case 16: return RomData16bitsDirective;
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case 32: return RomData32bitsDirective;
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default: return NULL;
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}
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}
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const char *PIC16TargetAsmInfo::
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getDataASDirective(unsigned Size, unsigned AS) const {
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if (AS == PIC16ISD::ROM_SPACE)
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return getRomDirective(Size);
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return NULL;
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}
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const Section *
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PIC16TargetAsmInfo::getBSSSectionForGlobal(const GlobalVariable *GV) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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Constant *C = GV->getInitializer();
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assert(C->isNullValue() && "Unitialized globals has non-zero initializer");
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// Find how much space this global needs.
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const TargetData *TD = TM.getTargetData();
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const Type *Ty = C->getType();
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unsigned ValSize = TD->getTypeAllocSize(Ty);
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// Go through all BSS Sections and assign this variable
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// to the first available section having enough space.
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PIC16Section *FoundBSS = NULL;
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for (unsigned i = 0; i < BSSSections.size(); i++) {
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if (DataBankSize - BSSSections[i]->Size >= ValSize) {
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FoundBSS = BSSSections[i];
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break;
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}
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}
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// No BSS section spacious enough was found. Crate a new one.
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if (!FoundBSS) {
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std::string name = PAN::getUdataSectionName(BSSSections.size());
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const Section *NewSection = getNamedSection(name.c_str());
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FoundBSS = new PIC16Section(NewSection);
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// Add this newly created BSS section to the list of BSSSections.
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BSSSections.push_back(FoundBSS);
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}
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// Insert the GV into this BSS.
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FoundBSS->Items.push_back(GV);
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FoundBSS->Size += ValSize;
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return FoundBSS->S_;
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}
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const Section *
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PIC16TargetAsmInfo::getIDATASectionForGlobal(const GlobalVariable *GV) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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Constant *C = GV->getInitializer();
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assert(!C->isNullValue() && "initialized globals has zero initializer");
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assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
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"can split initialized RAM data only");
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// Find how much space this global needs.
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const TargetData *TD = TM.getTargetData();
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const Type *Ty = C->getType();
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unsigned ValSize = TD->getTypeAllocSize(Ty);
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// Go through all IDATA Sections and assign this variable
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// to the first available section having enough space.
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PIC16Section *FoundIDATA = NULL;
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for (unsigned i = 0; i < IDATASections.size(); i++) {
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if (DataBankSize - IDATASections[i]->Size >= ValSize) {
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FoundIDATA = IDATASections[i];
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break;
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}
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}
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// No IDATA section spacious enough was found. Crate a new one.
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if (!FoundIDATA) {
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std::string name = PAN::getIdataSectionName(IDATASections.size());
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const Section *NewSection = getNamedSection(name.c_str());
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FoundIDATA = new PIC16Section(NewSection);
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// Add this newly created IDATA section to the list of IDATASections.
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IDATASections.push_back(FoundIDATA);
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}
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// Insert the GV into this IDATA.
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FoundIDATA->Items.push_back(GV);
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FoundIDATA->Size += ValSize;
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return FoundIDATA->S_;
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}
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// Get the section for an automatic variable of a function.
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// For PIC16 they are globals only with mangled names.
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const Section *
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PIC16TargetAsmInfo::getSectionForAuto(const GlobalVariable *GV) const {
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const std::string name = PAN::getSectionNameForSym(GV->getName());
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// Go through all Auto Sections and assign this variable
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// to the appropriate section.
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PIC16Section *FoundAutoSec = NULL;
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for (unsigned i = 0; i < AutosSections.size(); i++) {
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if (AutosSections[i]->S_->getName() == name) {
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FoundAutoSec = AutosSections[i];
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break;
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}
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}
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// No Auto section was found. Crate a new one.
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if (!FoundAutoSec) {
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const Section *NewSection = getNamedSection(name.c_str());
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FoundAutoSec = new PIC16Section(NewSection);
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// Add this newly created autos section to the list of AutosSections.
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AutosSections.push_back(FoundAutoSec);
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}
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// Insert the auto into this section.
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FoundAutoSec->Items.push_back(GV);
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return FoundAutoSec->S_;
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}
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// Override default implementation to put the true globals into
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// multiple data sections if required.
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const Section*
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PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) const {
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// We select the section based on the initializer here, so it really
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// has to be a GlobalVariable.
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const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
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if (!GV)
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return TargetAsmInfo::SelectSectionForGlobal(GV1);
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// Record Exteranl Var Decls.
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if (GV->isDeclaration()) {
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ExternalVarDecls->Items.push_back(GV);
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return ExternalVarDecls->S_;
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}
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assert(GV->hasInitializer() && "A def without initializer?");
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// First, if this is an automatic variable for a function, get the section
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// name for it and return.
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const std::string name = GV->getName();
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if (PAN::isLocalName(name)) {
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return getSectionForAuto(GV);
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}
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// Record Exteranl Var Defs.
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if (GV->hasExternalLinkage() || GV->hasCommonLinkage()) {
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ExternalVarDefs->Items.push_back(GV);
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}
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// See if this is an uninitialized global.
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const Constant *C = GV->getInitializer();
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if (C->isNullValue())
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return getBSSSectionForGlobal(GV);
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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return getIDATASectionForGlobal(GV);
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// This is initialized data in rom, put it in the readonly section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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return getROSectionForGlobal(GV);
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// Else let the default implementation take care of it.
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return TargetAsmInfo::SelectSectionForGlobal(GV);
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}
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PIC16TargetAsmInfo::~PIC16TargetAsmInfo() {
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for (unsigned i = 0; i < BSSSections.size(); i++)
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delete BSSSections[i];
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for (unsigned i = 0; i < IDATASections.size(); i++)
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delete IDATASections[i];
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for (unsigned i = 0; i < AutosSections.size(); i++)
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delete AutosSections[i];
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for (unsigned i = 0; i < ROSections.size(); i++)
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delete ROSections[i];
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delete ExternalVarDecls;
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delete ExternalVarDefs;
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}
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// Override the default implementation. Create PIC16sections for variables
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// which have a section name or address.
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const Section*
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PIC16TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
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const Section* S;
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// If GV has a sectin name or section address create that section now.
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if (GV->hasSection()) {
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std::string SectName = GV->getSection();
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// If address for a variable is specified, get the address and create
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// section.
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std::string AddrStr = "Address=";
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if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
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std::string SectAddr = SectName.substr(AddrStr.length());
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S = CreateSectionForGlobal(GV, SectAddr);
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} else {
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S = CreateSectionForGlobal(GV);
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}
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} else {
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// Use section depending on the 'type' of variable
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S = SelectSectionForGlobal(GV);
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}
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return S;
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}
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// Create a new section for global variable. If Addr is given then create
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// section at that address else create by name.
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const Section *
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PIC16TargetAsmInfo::CreateSectionForGlobal(const GlobalValue *GV1,
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std::string Addr) const {
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const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
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if (!GV)
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return TargetAsmInfo::SectionForGlobal(GV1);
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// See if this is an uninitialized global.
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const Constant *C = GV->getInitializer();
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if (C->isNullValue())
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return CreateBSSSectionForGlobal(GV, Addr);
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// If this is initialized data in RAM. Put it in the correct IDATA section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
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return CreateIDATASectionForGlobal(GV, Addr);
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// This is initialized data in rom, put it in the readonly section.
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if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
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return CreateROSectionForGlobal(GV, Addr);
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// Else let the default implementation take care of it.
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return TargetAsmInfo::SectionForGlobal(GV);
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}
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// Create uninitialized section for a variable.
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const Section *
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PIC16TargetAsmInfo::CreateBSSSectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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assert(GV->getInitializer()->isNullValue() &&
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"Unitialized global has non-zero initializer");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundBSS = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " UDATA";
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for (unsigned i = 0; i < BSSSections.size(); i++) {
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if (BSSSections[i]->S_->getName() == Name) {
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FoundBSS = BSSSections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getName() + "." + Addr + ".";
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Name = PAN::getUdataSectionName(BSSSections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewBSS = FoundBSS;
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if (NewBSS == NULL) {
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const Section *NewSection = getNamedSection(Name.c_str());
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NewBSS = new PIC16Section(NewSection);
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BSSSections.push_back(NewBSS);
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}
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// Insert the GV into this BSS.
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NewBSS->Items.push_back(GV);
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// We do not want to put any GV without explicit section into this section
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// so set its size to DatabankSize.
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NewBSS->Size = DataBankSize;
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return NewBSS->S_;
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}
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// Get rom section for a variable. Currently there can be only one rom section
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// unless a variable explicitly requests a section.
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const Section *
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PIC16TargetAsmInfo::getROSectionForGlobal(const GlobalVariable *GV) const {
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ROSections[0]->Items.push_back(GV);
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return ROSections[0]->S_;
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}
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// Create initialized data section for a variable.
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const Section *
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PIC16TargetAsmInfo::CreateIDATASectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->hasInitializer() && "This global doesn't need space");
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assert(!GV->getInitializer()->isNullValue() &&
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"initialized global has zero initializer");
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assert(GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
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"can be used for initialized RAM data only");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundIDATASec = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " IDATA";
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for (unsigned i = 0; i < IDATASections.size(); i++) {
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if (IDATASections[i]->S_->getName() == Name) {
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FoundIDATASec = IDATASections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getName() + "." + Addr + ".";
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Name = PAN::getIdataSectionName(IDATASections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewIDATASec = FoundIDATASec;
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if (NewIDATASec == NULL) {
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const Section *NewSection = getNamedSection(Name.c_str());
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NewIDATASec = new PIC16Section(NewSection);
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IDATASections.push_back(NewIDATASec);
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}
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// Insert the GV into this IDATA Section.
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NewIDATASec->Items.push_back(GV);
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// We do not want to put any GV without explicit section into this section
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// so set its size to DatabankSize.
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NewIDATASec->Size = DataBankSize;
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return NewIDATASec->S_;
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}
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// Create a section in rom for a variable.
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const Section *
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PIC16TargetAsmInfo::CreateROSectionForGlobal(const GlobalVariable *GV,
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std::string Addr) const {
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assert(GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE &&
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"can be used for ROM data only");
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std::string Name;
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// If address is given then create a section at that address else create a
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// section by section name specified in GV.
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PIC16Section *FoundROSec = NULL;
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if (Addr.empty()) {
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Name = GV->getSection() + " ROMDATA";
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for (unsigned i = 1; i < ROSections.size(); i++) {
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if (ROSections[i]->S_->getName() == Name) {
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FoundROSec = ROSections[i];
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break;
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}
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}
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} else {
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std::string Prefix = GV->getName() + "." + Addr + ".";
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Name = PAN::getRomdataSectionName(ROSections.size(), Prefix) + " " + Addr;
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}
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PIC16Section *NewRomSec = FoundROSec;
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if (NewRomSec == NULL) {
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const Section *NewSection = getNamedSection(Name.c_str());
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NewRomSec = new PIC16Section(NewSection);
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ROSections.push_back(NewRomSec);
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}
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// Insert the GV into this ROM Section.
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NewRomSec->Items.push_back(GV);
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return NewRomSec->S_;
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}
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