mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-28 06:29:45 +00:00
No target uses this currently. This patch only adds the mechanism so that local installations can choose to enable this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76177 91177308-0d34-0410-b5e6-96231b3b80d8
460 lines
15 KiB
C++
460 lines
15 KiB
C++
//===-- TargetAsmInfo.cpp - Asm Info ---------------------------------------==//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines target asm properties related what form asm statements
|
|
// should take.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/GlobalVariable.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Type.h"
|
|
#include "llvm/Target/TargetAsmInfo.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include <cctype>
|
|
#include <cstring>
|
|
using namespace llvm;
|
|
|
|
TargetAsmInfo::TargetAsmInfo(const TargetMachine &tm)
|
|
: TM(tm) {
|
|
BSSSection = "\t.bss";
|
|
BSSSection_ = 0;
|
|
ReadOnlySection = 0;
|
|
SmallDataSection = 0;
|
|
SmallBSSSection = 0;
|
|
SmallRODataSection = 0;
|
|
TLSDataSection = 0;
|
|
TLSBSSSection = 0;
|
|
ZeroFillDirective = 0;
|
|
NonexecutableStackDirective = 0;
|
|
NeedsSet = false;
|
|
MaxInstLength = 4;
|
|
PCSymbol = "$";
|
|
SeparatorChar = ';';
|
|
CommentColumn = 60;
|
|
CommentString = "#";
|
|
FirstOperandColumn = 0;
|
|
MaxOperandLength = 0;
|
|
GlobalPrefix = "";
|
|
PrivateGlobalPrefix = ".";
|
|
LessPrivateGlobalPrefix = "";
|
|
JumpTableSpecialLabelPrefix = 0;
|
|
GlobalVarAddrPrefix = "";
|
|
GlobalVarAddrSuffix = "";
|
|
FunctionAddrPrefix = "";
|
|
FunctionAddrSuffix = "";
|
|
PersonalityPrefix = "";
|
|
PersonalitySuffix = "";
|
|
NeedsIndirectEncoding = false;
|
|
InlineAsmStart = "#APP";
|
|
InlineAsmEnd = "#NO_APP";
|
|
AssemblerDialect = 0;
|
|
AllowQuotesInName = false;
|
|
ZeroDirective = "\t.zero\t";
|
|
ZeroDirectiveSuffix = 0;
|
|
AsciiDirective = "\t.ascii\t";
|
|
AscizDirective = "\t.asciz\t";
|
|
Data8bitsDirective = "\t.byte\t";
|
|
Data16bitsDirective = "\t.short\t";
|
|
Data32bitsDirective = "\t.long\t";
|
|
Data64bitsDirective = "\t.quad\t";
|
|
AlignDirective = "\t.align\t";
|
|
AlignmentIsInBytes = true;
|
|
TextAlignFillValue = 0;
|
|
SwitchToSectionDirective = "\t.section\t";
|
|
TextSectionStartSuffix = "";
|
|
DataSectionStartSuffix = "";
|
|
SectionEndDirectiveSuffix = 0;
|
|
ConstantPoolSection = "\t.section .rodata";
|
|
JumpTableDataSection = "\t.section .rodata";
|
|
JumpTableDirective = 0;
|
|
CStringSection = 0;
|
|
CStringSection_ = 0;
|
|
// FIXME: Flags are ELFish - replace with normal section stuff.
|
|
StaticCtorsSection = "\t.section .ctors,\"aw\",@progbits";
|
|
StaticDtorsSection = "\t.section .dtors,\"aw\",@progbits";
|
|
GlobalDirective = "\t.globl\t";
|
|
SetDirective = 0;
|
|
LCOMMDirective = 0;
|
|
COMMDirective = "\t.comm\t";
|
|
COMMDirectiveTakesAlignment = true;
|
|
HasDotTypeDotSizeDirective = true;
|
|
HasSingleParameterDotFile = true;
|
|
UsedDirective = 0;
|
|
WeakRefDirective = 0;
|
|
WeakDefDirective = 0;
|
|
// FIXME: These are ELFish - move to ELFTAI.
|
|
HiddenDirective = "\t.hidden\t";
|
|
ProtectedDirective = "\t.protected\t";
|
|
AbsoluteDebugSectionOffsets = false;
|
|
AbsoluteEHSectionOffsets = false;
|
|
HasLEB128 = false;
|
|
HasDotLocAndDotFile = false;
|
|
SupportsDebugInformation = false;
|
|
SupportsExceptionHandling = false;
|
|
DwarfRequiresFrameSection = true;
|
|
DwarfUsesInlineInfoSection = false;
|
|
NonLocalEHFrameLabel = false;
|
|
GlobalEHDirective = 0;
|
|
SupportsWeakOmittedEHFrame = true;
|
|
DwarfSectionOffsetDirective = 0;
|
|
DwarfAbbrevSection = ".debug_abbrev";
|
|
DwarfInfoSection = ".debug_info";
|
|
DwarfLineSection = ".debug_line";
|
|
DwarfFrameSection = ".debug_frame";
|
|
DwarfPubNamesSection = ".debug_pubnames";
|
|
DwarfPubTypesSection = ".debug_pubtypes";
|
|
DwarfDebugInlineSection = ".debug_inlined";
|
|
DwarfStrSection = ".debug_str";
|
|
DwarfLocSection = ".debug_loc";
|
|
DwarfARangesSection = ".debug_aranges";
|
|
DwarfRangesSection = ".debug_ranges";
|
|
DwarfMacroInfoSection = ".debug_macinfo";
|
|
DwarfEHFrameSection = ".eh_frame";
|
|
DwarfExceptionSection = ".gcc_except_table";
|
|
AsmTransCBE = 0;
|
|
TextSection = getUnnamedSection("\t.text", SectionFlags::Code);
|
|
DataSection = getUnnamedSection("\t.data", SectionFlags::Writeable);
|
|
}
|
|
|
|
TargetAsmInfo::~TargetAsmInfo() {
|
|
}
|
|
|
|
/// Measure the specified inline asm to determine an approximation of its
|
|
/// length.
|
|
/// Comments (which run till the next SeparatorChar or newline) do not
|
|
/// count as an instruction.
|
|
/// Any other non-whitespace text is considered an instruction, with
|
|
/// multiple instructions separated by SeparatorChar or newlines.
|
|
/// Variable-length instructions are not handled here; this function
|
|
/// may be overloaded in the target code to do that.
|
|
unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
|
|
// Count the number of instructions in the asm.
|
|
bool atInsnStart = true;
|
|
unsigned Length = 0;
|
|
for (; *Str; ++Str) {
|
|
if (*Str == '\n' || *Str == SeparatorChar)
|
|
atInsnStart = true;
|
|
if (atInsnStart && !isspace(*Str)) {
|
|
Length += MaxInstLength;
|
|
atInsnStart = false;
|
|
}
|
|
if (atInsnStart && strncmp(Str, CommentString, strlen(CommentString))==0)
|
|
atInsnStart = false;
|
|
}
|
|
|
|
return Length;
|
|
}
|
|
|
|
unsigned TargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
|
|
bool Global) const {
|
|
return dwarf::DW_EH_PE_absptr;
|
|
}
|
|
|
|
static bool isSuitableForBSS(const GlobalVariable *GV) {
|
|
if (!GV->hasInitializer())
|
|
return true;
|
|
|
|
// Leave constant zeros in readonly constant sections, so they can be shared
|
|
Constant *C = GV->getInitializer();
|
|
return (C->isNullValue() && !GV->isConstant() && !NoZerosInBSS);
|
|
}
|
|
|
|
static bool isConstantString(const Constant *C) {
|
|
// First check: is we have constant array of i8 terminated with zero
|
|
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
|
|
// Check, if initializer is a null-terminated string
|
|
if (CVA && CVA->isCString())
|
|
return true;
|
|
|
|
// Another possibility: [1 x i8] zeroinitializer
|
|
if (isa<ConstantAggregateZero>(C)) {
|
|
if (const ArrayType *Ty = dyn_cast<ArrayType>(C->getType())) {
|
|
return (Ty->getElementType() == Type::Int8Ty &&
|
|
Ty->getNumElements() == 1);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
unsigned TargetAsmInfo::RelocBehaviour() const {
|
|
// By default - all relocations in PIC mode would force symbol to be
|
|
// placed in r/w section.
|
|
return (TM.getRelocationModel() != Reloc::Static ?
|
|
Reloc::LocalOrGlobal : Reloc::None);
|
|
}
|
|
|
|
SectionKind::Kind
|
|
TargetAsmInfo::SectionKindForGlobal(const GlobalValue *GV) const {
|
|
// Early exit - functions should be always in text sections.
|
|
if (isa<Function>(GV))
|
|
return SectionKind::Text;
|
|
|
|
const GlobalVariable* GVar = dyn_cast<GlobalVariable>(GV);
|
|
bool isThreadLocal = GVar->isThreadLocal();
|
|
assert(GVar && "Invalid global value for section selection");
|
|
|
|
if (isSuitableForBSS(GVar)) {
|
|
// Variable can be easily put to BSS section.
|
|
return (isThreadLocal ? SectionKind::ThreadBSS : SectionKind::BSS);
|
|
} else if (GVar->isConstant() && !isThreadLocal) {
|
|
// Now we know, that varible has initializer and it is constant. We need to
|
|
// check its initializer to decide, which section to output it into. Also
|
|
// note, there is no thread-local r/o section.
|
|
Constant *C = GVar->getInitializer();
|
|
if (C->ContainsRelocations(Reloc::LocalOrGlobal)) {
|
|
// Decide, whether it is still possible to put symbol into r/o section.
|
|
unsigned Reloc = RelocBehaviour();
|
|
|
|
// We already did a query for 'all' relocs, thus - early exits.
|
|
if (Reloc == Reloc::LocalOrGlobal)
|
|
return SectionKind::Data;
|
|
else if (Reloc == Reloc::None)
|
|
return SectionKind::ROData;
|
|
else {
|
|
// Ok, target wants something funny. Honour it.
|
|
return (C->ContainsRelocations(Reloc) ?
|
|
SectionKind::Data : SectionKind::ROData);
|
|
}
|
|
} else {
|
|
// Check, if initializer is a null-terminated string
|
|
if (isConstantString(C))
|
|
return SectionKind::RODataMergeStr;
|
|
else
|
|
return SectionKind::RODataMergeConst;
|
|
}
|
|
}
|
|
|
|
// Variable either is not constant or thread-local - output to data section.
|
|
return (isThreadLocal ? SectionKind::ThreadData : SectionKind::Data);
|
|
}
|
|
|
|
unsigned
|
|
TargetAsmInfo::SectionFlagsForGlobal(const GlobalValue *GV,
|
|
const char* Name) const {
|
|
unsigned Flags = SectionFlags::None;
|
|
|
|
// Decode flags from global itself.
|
|
if (GV) {
|
|
SectionKind::Kind Kind = SectionKindForGlobal(GV);
|
|
switch (Kind) {
|
|
case SectionKind::Text:
|
|
Flags |= SectionFlags::Code;
|
|
break;
|
|
case SectionKind::ThreadData:
|
|
case SectionKind::ThreadBSS:
|
|
Flags |= SectionFlags::TLS;
|
|
// FALLS THROUGH
|
|
case SectionKind::Data:
|
|
case SectionKind::DataRel:
|
|
case SectionKind::DataRelLocal:
|
|
case SectionKind::DataRelRO:
|
|
case SectionKind::DataRelROLocal:
|
|
case SectionKind::BSS:
|
|
Flags |= SectionFlags::Writeable;
|
|
break;
|
|
case SectionKind::ROData:
|
|
case SectionKind::RODataMergeStr:
|
|
case SectionKind::RODataMergeConst:
|
|
// No additional flags here
|
|
break;
|
|
case SectionKind::SmallData:
|
|
case SectionKind::SmallBSS:
|
|
Flags |= SectionFlags::Writeable;
|
|
// FALLS THROUGH
|
|
case SectionKind::SmallROData:
|
|
Flags |= SectionFlags::Small;
|
|
break;
|
|
default:
|
|
llvm_unreachable("Unexpected section kind!");
|
|
}
|
|
|
|
if (GV->isWeakForLinker())
|
|
Flags |= SectionFlags::Linkonce;
|
|
}
|
|
|
|
// Add flags from sections, if any.
|
|
if (Name && *Name) {
|
|
Flags |= SectionFlags::Named;
|
|
|
|
// Some lame default implementation based on some magic section names.
|
|
if (strncmp(Name, ".gnu.linkonce.b.", 16) == 0 ||
|
|
strncmp(Name, ".llvm.linkonce.b.", 17) == 0 ||
|
|
strncmp(Name, ".gnu.linkonce.sb.", 17) == 0 ||
|
|
strncmp(Name, ".llvm.linkonce.sb.", 18) == 0)
|
|
Flags |= SectionFlags::BSS;
|
|
else if (strcmp(Name, ".tdata") == 0 ||
|
|
strncmp(Name, ".tdata.", 7) == 0 ||
|
|
strncmp(Name, ".gnu.linkonce.td.", 17) == 0 ||
|
|
strncmp(Name, ".llvm.linkonce.td.", 18) == 0)
|
|
Flags |= SectionFlags::TLS;
|
|
else if (strcmp(Name, ".tbss") == 0 ||
|
|
strncmp(Name, ".tbss.", 6) == 0 ||
|
|
strncmp(Name, ".gnu.linkonce.tb.", 17) == 0 ||
|
|
strncmp(Name, ".llvm.linkonce.tb.", 18) == 0)
|
|
Flags |= SectionFlags::BSS | SectionFlags::TLS;
|
|
}
|
|
|
|
return Flags;
|
|
}
|
|
|
|
const Section*
|
|
TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
|
|
const Section* S;
|
|
// Select section name
|
|
if (GV->hasSection()) {
|
|
// Honour section already set, if any
|
|
unsigned Flags = SectionFlagsForGlobal(GV,
|
|
GV->getSection().c_str());
|
|
S = getNamedSection(GV->getSection().c_str(), Flags);
|
|
} else {
|
|
// Use default section depending on the 'type' of global
|
|
S = SelectSectionForGlobal(GV);
|
|
}
|
|
|
|
return S;
|
|
}
|
|
|
|
// Lame default implementation. Calculate the section name for global.
|
|
const Section*
|
|
TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
|
|
SectionKind::Kind Kind = SectionKindForGlobal(GV);
|
|
|
|
if (GV->isWeakForLinker()) {
|
|
std::string Name = UniqueSectionForGlobal(GV, Kind);
|
|
unsigned Flags = SectionFlagsForGlobal(GV, Name.c_str());
|
|
return getNamedSection(Name.c_str(), Flags);
|
|
} else {
|
|
if (Kind == SectionKind::Text)
|
|
return getTextSection();
|
|
else if (isBSS(Kind) && getBSSSection_())
|
|
return getBSSSection_();
|
|
else if (getReadOnlySection() && SectionKind::isReadOnly(Kind))
|
|
return getReadOnlySection();
|
|
}
|
|
|
|
return getDataSection();
|
|
}
|
|
|
|
// Lame default implementation. Calculate the section name for machine const.
|
|
const Section*
|
|
TargetAsmInfo::SelectSectionForMachineConst(const Type *Ty) const {
|
|
// FIXME: Support data.rel stuff someday
|
|
return getDataSection();
|
|
}
|
|
|
|
std::string
|
|
TargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
|
|
SectionKind::Kind Kind) const {
|
|
switch (Kind) {
|
|
case SectionKind::Text:
|
|
return ".gnu.linkonce.t." + GV->getName();
|
|
case SectionKind::Data:
|
|
return ".gnu.linkonce.d." + GV->getName();
|
|
case SectionKind::DataRel:
|
|
return ".gnu.linkonce.d.rel" + GV->getName();
|
|
case SectionKind::DataRelLocal:
|
|
return ".gnu.linkonce.d.rel.local" + GV->getName();
|
|
case SectionKind::DataRelRO:
|
|
return ".gnu.linkonce.d.rel.ro" + GV->getName();
|
|
case SectionKind::DataRelROLocal:
|
|
return ".gnu.linkonce.d.rel.ro.local" + GV->getName();
|
|
case SectionKind::SmallData:
|
|
return ".gnu.linkonce.s." + GV->getName();
|
|
case SectionKind::BSS:
|
|
return ".gnu.linkonce.b." + GV->getName();
|
|
case SectionKind::SmallBSS:
|
|
return ".gnu.linkonce.sb." + GV->getName();
|
|
case SectionKind::ROData:
|
|
case SectionKind::RODataMergeConst:
|
|
case SectionKind::RODataMergeStr:
|
|
return ".gnu.linkonce.r." + GV->getName();
|
|
case SectionKind::SmallROData:
|
|
return ".gnu.linkonce.s2." + GV->getName();
|
|
case SectionKind::ThreadData:
|
|
return ".gnu.linkonce.td." + GV->getName();
|
|
case SectionKind::ThreadBSS:
|
|
return ".gnu.linkonce.tb." + GV->getName();
|
|
default:
|
|
llvm_unreachable("Unknown section kind");
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const Section*
|
|
TargetAsmInfo::getNamedSection(const char *Name, unsigned Flags,
|
|
bool Override) const {
|
|
Section& S = Sections[Name];
|
|
|
|
// This is newly-created section, set it up properly.
|
|
if (S.Flags == SectionFlags::Invalid || Override) {
|
|
S.Flags = Flags | SectionFlags::Named;
|
|
S.Name = Name;
|
|
}
|
|
|
|
return &S;
|
|
}
|
|
|
|
const Section*
|
|
TargetAsmInfo::getUnnamedSection(const char *Directive, unsigned Flags,
|
|
bool Override) const {
|
|
Section& S = Sections[Directive];
|
|
|
|
// This is newly-created section, set it up properly.
|
|
if (S.Flags == SectionFlags::Invalid || Override) {
|
|
S.Flags = Flags & ~SectionFlags::Named;
|
|
S.Name = Directive;
|
|
}
|
|
|
|
return &S;
|
|
}
|
|
|
|
const std::string&
|
|
TargetAsmInfo::getSectionFlags(unsigned Flags) const {
|
|
SectionFlags::FlagsStringsMapType::iterator I = FlagsStrings.find(Flags);
|
|
|
|
// We didn't print these flags yet, print and save them to map. This reduces
|
|
// amount of heap trashing due to std::string construction / concatenation.
|
|
if (I == FlagsStrings.end())
|
|
I = FlagsStrings.insert(std::make_pair(Flags,
|
|
printSectionFlags(Flags))).first;
|
|
|
|
return I->second;
|
|
}
|
|
|
|
unsigned TargetAsmInfo::getULEB128Size(unsigned Value) {
|
|
unsigned Size = 0;
|
|
do {
|
|
Value >>= 7;
|
|
Size += sizeof(int8_t);
|
|
} while (Value);
|
|
return Size;
|
|
}
|
|
|
|
unsigned TargetAsmInfo::getSLEB128Size(int Value) {
|
|
unsigned Size = 0;
|
|
int Sign = Value >> (8 * sizeof(Value) - 1);
|
|
bool IsMore;
|
|
|
|
do {
|
|
unsigned Byte = Value & 0x7f;
|
|
Value >>= 7;
|
|
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
|
|
Size += sizeof(int8_t);
|
|
} while (IsMore);
|
|
return Size;
|
|
}
|