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Iterate over globals once and sectionize them into appropriate sections.

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Later in asmprinter, go over thsese sections and print them.
Do not print empty sections.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjiv Gupta 2009-05-12 17:07:27 +00:00
parent e36b6d425f
commit 2364cfeb54
4 changed files with 111 additions and 78 deletions
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126
lib/Target/PIC16/PIC16AsmPrinter.cpp
View File

@ -164,7 +164,6 @@ void PIC16AsmPrinter::printDecls(void) {
for (std::list<const char*>::const_iterator I = Decls.begin();
I != Decls.end(); I++) {
O << TAI->getExternDirective() << *I << "\n";
// FIXME: Use PAN::getXXXLabel() funtions hrer.
O << TAI->getExternDirective() << PAN::getArgsLabel(*I) << "\n";
O << TAI->getExternDirective() << PAN::getRetvalLabel(*I) << "\n";
}
@ -183,8 +182,16 @@ bool PIC16AsmPrinter::doInitialization (Module &M) {
assert(DW && "Dwarf Writer is not available");
DW->BeginModule(&M, MMI, O, this, TAI);
// Set the section names for all globals.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
I->setSection(TAI->SectionForGlobal(I)->getName());
}
EmitExternsAndGlobals (M);
EmitGlobalData(M);
EmitIData(M);
EmitUData(M);
EmitAutos(M);
EmitRomData(M);
return Result;
}
@ -238,31 +245,19 @@ void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
void PIC16AsmPrinter::EmitRomData (Module &M)
{
SwitchToSection(TAI->getReadOnlySection());
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (!I->hasInitializer()) // External global require no code.
continue;
const PIC16TargetAsmInfo *PTAI = static_cast<const PIC16TargetAsmInfo *>(TAI);
Constant *C = I->getInitializer();
const PointerType *PtrTy = I->getType();
int AddrSpace = PtrTy->getAddressSpace();
if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {
std::vector<const GlobalVariable*> Items = PTAI->ROSection->Items;
if (! Items.size()) return;
if (EmitSpecialLLVMGlobal(I))
continue;
// Any variables reaching here with "." in its name is a local scope
// variable and should not be printed in global data section.
std::string name = Mang->getValueName(I);
if (PAN::isLocalName(name))
continue;
I->setSection(TAI->getReadOnlySection()->getName());
O << name;
EmitGlobalConstant(C, AddrSpace);
O << "\n";
}
// Print ROData ection.
O << "\n";
SwitchToSection(PTAI->ROSection->S_);
for (unsigned j = 0; j < Items.size(); j++) {
O << Mang->getValueName(Items[j]);
Constant *C = Items[j]->getInitializer();
int AddrSpace = Items[j]->getType()->getAddressSpace();
EmitGlobalConstant(C, AddrSpace);
}
}
@ -276,9 +271,7 @@ bool PIC16AsmPrinter::doFinalization(Module &M) {
void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
const Function *F = MF.getFunction();
std::string FuncName = Mang->getValueName(F);
Module *M = const_cast<Module *>(F->getParent());
const TargetData *TD = TM.getTargetData();
unsigned FrameSize = 0;
// Emit the data section name.
O << "\n";
const char *SectionName = PAN::getFrameSectionName(CurrentFnName).c_str();
@ -318,57 +311,15 @@ void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
int TempSize = PTLI->GetTmpSize();
if (TempSize > 0 )
O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize <<"\n";
// Emit the section name for local variables.
O << "\n";
const char* SecNameLocals = PAN::getAutosSectionName(CurrentFnName).c_str() ;
const Section *fADataSection = TAI->getNamedSection(SecNameLocals,
SectionFlags::Writeable);
SwitchToSection(fADataSection);
// Emit the function variables.
// In PIC16 all the function arguments and local variables are global.
// Therefore to get the variable belonging to this function entire
// global list will be traversed and variables belonging to this function
// will be emitted in the current data section.
for (Module::global_iterator I = M->global_begin(), E = M->global_end();
I != E; ++I) {
std::string VarName = Mang->getValueName(I);
// The variables of a function are of form FuncName.* . If this variable
// does not belong to this function then continue.
// Static local varilabes of a function does not have .auto. in their
// name. They are not printed as part of function data but module
// level global data.
if (! PAN::isLocalToFunc(FuncName, VarName))
continue;
I->setSection(TAI->SectionForGlobal(I)->getName());
Constant *C = I->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypeAllocSize(Ty);
FrameSize += Size;
// Emit memory reserve directive.
O << VarName << " RES " << Size << "\n";
}
}
void PIC16AsmPrinter::EmitGlobalData (Module &M)
{
// Set the section names for all globals.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
I->setSection(TAI->SectionForGlobal(I)->getName());
}
void PIC16AsmPrinter::EmitIData (Module &M) {
const PIC16TargetAsmInfo *PTAI = static_cast<const PIC16TargetAsmInfo *>(TAI);
const TargetData *TD = TM.getTargetData();
// Now print all IDATA sections.
// Print all IDATA sections.
std::vector <PIC16Section *>IDATASections = PTAI->IDATASections;
for (unsigned i = 0; i < IDATASections.size(); i++) {
O << "\n";
SwitchToSection(IDATASections[i]->S_);
std::vector<const GlobalVariable*> Items = IDATASections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
@ -379,10 +330,16 @@ void PIC16AsmPrinter::EmitGlobalData (Module &M)
EmitGlobalConstant(C, AddrSpace);
}
}
}
// Now print all BSS sections.
void PIC16AsmPrinter::EmitUData (Module &M) {
const PIC16TargetAsmInfo *PTAI = static_cast<const PIC16TargetAsmInfo *>(TAI);
const TargetData *TD = TM.getTargetData();
// Print all BSS sections.
std::vector <PIC16Section *>BSSSections = PTAI->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++) {
@ -397,3 +354,26 @@ void PIC16AsmPrinter::EmitGlobalData (Module &M)
}
}
void PIC16AsmPrinter::EmitAutos (Module &M)
{
// Section names for all globals are already set.
const PIC16TargetAsmInfo *PTAI = static_cast<const PIC16TargetAsmInfo *>(TAI);
const TargetData *TD = TM.getTargetData();
// Now print all Autos sections.
std::vector <PIC16Section *>AutosSections = PTAI->AutosSections;
for (unsigned i = 0; i < AutosSections.size(); i++) {
O << "\n";
SwitchToSection(AutosSections[i]->S_);
std::vector<const GlobalVariable*> Items = AutosSections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string VarName = Mang->getValueName(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";
}
}
}

4
lib/Target/PIC16/PIC16AsmPrinter.h
View File

@ -43,7 +43,9 @@ namespace llvm {
bool printInstruction(const MachineInstr *MI); // definition autogenerated.
bool printMachineInstruction(const MachineInstr *MI);
void EmitExternsAndGlobals (Module &M);
void EmitGlobalData (Module &M);
void EmitIData (Module &M);
void EmitUData (Module &M);
void EmitAutos (Module &M);
void EmitRomData (Module &M);
void emitFunctionData(MachineFunction &MF);
void printDecls(void);

53
lib/Target/PIC16/PIC16TargetAsmInfo.cpp
View File

@ -44,6 +44,7 @@ PIC16TargetAsmInfo(const PIC16TargetMachine &TM)
// Need because otherwise a .text symbol is emitted by DwarfWriter
// in BeginModule, and gpasm cribbs for that .text symbol.
TextSection = getUnnamedSection("", SectionFlags::Code);
ROSection = new PIC16Section(getReadOnlySection());
}
const char *PIC16TargetAsmInfo::getRomDirective(unsigned size) const
@ -154,6 +155,40 @@ PIC16TargetAsmInfo::getIDATASectionForGlobal(const GlobalVariable *GV) const {
return FoundIDATA->S_;
}
// Get the section for an automatic variable of a function.
// For PIC16 they are globals only with mangled names.
const Section *
PIC16TargetAsmInfo::getSectionForAuto(const GlobalVariable *GV) const {
const std::string name = PAN::getSectionNameForSym(GV->getName());
// Go through all Auto Sections and assign this variable
// to the appropriate section.
PIC16Section *FoundAutoSec = NULL;
for (unsigned i = 0; i < AutosSections.size(); i++) {
if ( AutosSections[i]->S_->getName() == name) {
FoundAutoSec = AutosSections[i];
break;
}
}
// No Auto section was found. Crate a new one.
if (! FoundAutoSec) {
const Section *NewSection = getNamedSection (name.c_str());
FoundAutoSec = new PIC16Section(NewSection);
// Add this newly created autos section to the list of AutosSections.
AutosSections.push_back(FoundAutoSec);
}
// Insert the auto into this section.
FoundAutoSec->Items.push_back(GV);
return FoundAutoSec->S_;
}
// Override default implementation to put the true globals into
// multiple data sections if required.
const Section*
@ -168,8 +203,7 @@ PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) const {
// name for it and return.
const std::string name = GV->getName();
if (PAN::isLocalName(name)) {
const std::string Sec_Name = PAN::getSectionNameForSym(name);
return getNamedSection(Sec_Name.c_str());
return getSectionForAuto(GV);
}
// See if this is an uninitialized global.
@ -177,11 +211,16 @@ PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) const {
if (C->isNullValue())
return getBSSSectionForGlobal(GV);
// This is initialized data. We only deal with initialized data in RAM.
// If this is initialized data in RAM. Put it in the correct IDATA section.
if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
return getIDATASectionForGlobal(GV);
// This is initialized data in rom, put it in the readonly section.
if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE) {
ROSection->Items.push_back(GV);
return ROSection->S_;
}
// Else let the default implementation take care of it.
return TargetAsmInfo::SelectSectionForGlobal(GV);
}
@ -195,4 +234,10 @@ PIC16TargetAsmInfo::~PIC16TargetAsmInfo() {
for (unsigned i = 0; i < IDATASections.size(); i++) {
delete IDATASections[i];
}
for (unsigned i = 0; i < AutosSections.size(); i++) {
delete AutosSections[i];
}
delete ROSection;
}

6
lib/Target/PIC16/PIC16TargetAsmInfo.h
View File

@ -43,6 +43,8 @@ namespace llvm {
PIC16TargetAsmInfo(const PIC16TargetMachine &TM);
mutable std::vector<PIC16Section *> BSSSections;
mutable std::vector<PIC16Section *> IDATASections;
mutable std::vector<PIC16Section *> AutosSections;
mutable PIC16Section *ROSection;
virtual ~PIC16TargetAsmInfo();
private:
@ -53,6 +55,7 @@ namespace llvm {
virtual const char *getASDirective(unsigned size, unsigned AS) const;
const Section *getBSSSectionForGlobal(const GlobalVariable *GV) const;
const Section *getIDATASectionForGlobal(const GlobalVariable *GV) const;
const Section *getSectionForAuto(const GlobalVariable *GV) const;
virtual const Section *SelectSectionForGlobal(const GlobalValue *GV) const;
public:
void SetSectionForGVs(Module &M);
@ -62,6 +65,9 @@ namespace llvm {
std::vector<PIC16Section *> getIDATASections() const {
return IDATASections;
}
std::vector<PIC16Section *> getAutosSections() const {
return AutosSections;
}
};
} // namespace llvm