-//===-- TargetAsmInfo.cpp - Asm Info ---------------------------------------==//
+//===-- llvm/Target/TargetAsmInfo.cpp - Target Assembly Info --------------===//
//
// The LLVM Compiler Infrastructure
//
// 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/TargetData.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.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>
+#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
-TargetAsmInfo::TargetAsmInfo(const TargetMachine &tm) : TM(tm) {
- BSSSection = "\t.bss";
- BSSSection_ = 0;
- ReadOnlySection = 0;
- TLSDataSection = 0;
- TLSBSSSection = 0;
- ZeroFillDirective = 0;
- NonexecutableStackDirective = 0;
- NeedsSet = false;
- MaxInstLength = 4;
- PCSymbol = "$";
- SeparatorChar = ';';
- CommentColumn = 60;
- CommentString = "#";
- FirstOperandColumn = 0;
- MaxOperandLength = 0;
- GlobalPrefix = "";
- PrivateGlobalPrefix = ".";
- LinkerPrivateGlobalPrefix = "";
- 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;
- Is_EHSymbolPrivate = true;
- 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) {
- // 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;
-}
-
-static unsigned SectionFlagsForGlobal(const GlobalValue *GV,
- SectionKind::Kind Kind) {
- unsigned Flags = SectionFlags::None;
-
- // Decode flags from global itself.
- 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;
- default:
- llvm_unreachable("Unexpected section kind!");
- }
-
- if (GV->isWeakForLinker())
- Flags |= SectionFlags::Linkonce;
-
- return Flags;
-}
-
-static SectionKind::Kind SectionKindForGlobal(const GlobalValue *GV,
- Reloc::Model ReloModel) {
- // Early exit - functions should be always in text sections.
- const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
- if (GVar == 0)
- return SectionKind::Text;
-
- bool isThreadLocal = GVar->isThreadLocal();
-
- // Variable can be easily put to BSS section.
- if (isSuitableForBSS(GVar))
- return isThreadLocal ? SectionKind::ThreadBSS : SectionKind::BSS;
-
- // If this is thread-local, put it in the general "thread_data" section.
- if (isThreadLocal)
- return SectionKind::ThreadData;
-
- Constant *C = GVar->getInitializer();
-
- // If the global is marked constant, we can put it into a mergable section,
- // a mergable string section, or general .data if it contains relocations.
- if (GVar->isConstant()) {
- // If the initializer for the global contains something that requires a
- // relocation, then we may have to drop this into a wriable data section
- // even though it is marked const.
- switch (C->getRelocationInfo()) {
- default: llvm_unreachable("unknown relocation info kind");
- case Constant::NoRelocation:
- // If initializer is a null-terminated string, put it in a "cstring"
- // section if the target has it.
- if (isConstantString(C))
- return SectionKind::RODataMergeStr;
-
- // Otherwise, just drop it into a mergable constant section.
- return SectionKind::RODataMergeConst;
-
- case Constant::LocalRelocation:
- // In static relocation model, the linker will resolve all addresses, so
- // the relocation entries will actually be constants by the time the app
- // starts up.
- if (ReloModel == Reloc::Static)
- return SectionKind::ROData;
-
- // Otherwise, the dynamic linker needs to fix it up, put it in the
- // writable data.rel.local section.
- return SectionKind::DataRelROLocal;
-
- case Constant::GlobalRelocations:
- // In static relocation model, the linker will resolve all addresses, so
- // the relocation entries will actually be constants by the time the app
- // starts up.
- if (ReloModel == Reloc::Static)
- return SectionKind::ROData;
-
- // Otherwise, the dynamic linker needs to fix it up, put it in the
- // writable data.rel section.
- return SectionKind::DataRelRO;
- }
- }
-
- // Okay, this isn't a constant. If the initializer for the global is going
- // to require a runtime relocation by the dynamic linker, put it into a more
- // specific section to improve startup time of the app. This coalesces these
- // globals together onto fewer pages, improving the locality of the dynamic
- // linker.
- if (ReloModel == Reloc::Static)
- return SectionKind::Data;
-
- switch (C->getRelocationInfo()) {
- default: llvm_unreachable("unknown relocation info kind");
- case Constant::NoRelocation: return SectionKind::Data;
- case Constant::LocalRelocation: return SectionKind::DataRelLocal;
- case Constant::GlobalRelocations: return SectionKind::DataRel;
- }
-}
-
-
-const Section *TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
- SectionKind::Kind Kind = SectionKindForGlobal(GV, TM.getRelocationModel());
-
- // Select section name.
- if (GV->hasSection()) {
- // If the target has special section hacks for specifically named globals,
- // return them now.
- if (const Section *TS = getSpecialCasedSectionGlobals(GV, Kind))
- return TS;
-
- // Honour section already set, if any.
- unsigned Flags = SectionFlagsForGlobal(GV, Kind);
-
- // This is an explicitly named section.
- Flags |= SectionFlags::Named;
-
- // If the target has magic semantics for certain section names, make sure to
- // pick up the flags. This allows the user to write things with attribute
- // section and still get the appropriate section flags printed.
- Flags |= getFlagsForNamedSection(GV->getSection().c_str());
-
- return getNamedSection(GV->getSection().c_str(), Flags);
- }
-
- // If this global is linkonce/weak and the target handles this by emitting it
- // into a 'uniqued' section name, create and return the section now.
- if (GV->isWeakForLinker()) {
- if (const char *Prefix = getSectionPrefixForUniqueGlobal(Kind)) {
- unsigned Flags = SectionFlagsForGlobal(GV, Kind);
-
- // FIXME: Use mangler interface (PR4584).
- std::string Name = Prefix+GV->getNameStr();
-
- // Pick up the flags for the uniquing section.
- // FIXME: HACK.
- Flags |= getFlagsForNamedSection(Name.c_str());
-
- return getNamedSection(Name.c_str(), Flags);
- }
- }
-
- // Use default section depending on the 'type' of global
- return SelectSectionForGlobal(GV, Kind);
-}
-
-// Lame default implementation. Calculate the section name for global.
-const Section*
-TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV,
- SectionKind::Kind Kind) const {
- if (Kind == SectionKind::Text)
- return getTextSection();
-
- if (Kind == SectionKind::BSS)
- if (const Section *S = getBSSSection_())
- return S;
-
- if (SectionKind::isReadOnly(Kind))
- if (const Section *S = getReadOnlySection())
- return S;
-
- return getDataSection();
-}
-
-/// getSectionForMergableConstant - Given a mergable constant with the
-/// specified size and relocation information, return a section that it
-/// should be placed in.
-const Section *
-TargetAsmInfo::getSectionForMergableConstant(uint64_t Size,
- unsigned ReloInfo) const {
- // FIXME: Support data.rel stuff someday
- // Lame default implementation. Calculate the section name for machine const.
- return getDataSection();
-}
-
-
-
-
-const char *
-TargetAsmInfo::getSectionPrefixForUniqueGlobal(SectionKind::Kind Kind) const {
- switch (Kind) {
- default: llvm_unreachable("Unknown section kind");
- case SectionKind::Text: return ".gnu.linkonce.t.";
- case SectionKind::Data: return ".gnu.linkonce.d.";
- case SectionKind::DataRel: return ".gnu.linkonce.d.rel.";
- case SectionKind::DataRelLocal: return ".gnu.linkonce.d.rel.local.";
- case SectionKind::DataRelRO: return ".gnu.linkonce.d.rel.ro.";
- case SectionKind::DataRelROLocal: return ".gnu.linkonce.d.rel.ro.local.";
- case SectionKind::BSS: return ".gnu.linkonce.b.";
- case SectionKind::ROData:
- case SectionKind::RODataMergeConst:
- case SectionKind::RODataMergeStr: return ".gnu.linkonce.r.";
- case SectionKind::ThreadData: return ".gnu.linkonce.td.";
- case SectionKind::ThreadBSS: return ".gnu.linkonce.tb.";
- }
-}
-
-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;
+TargetAsmInfo::TargetAsmInfo(const TargetMachine &TM) {
+ TLOF = &TM.getTargetLowering()->getObjFileLowering();
+ const TargetData &TD = *TM.getTargetData();
+ IsLittleEndian = TD.isLittleEndian();
+ PointerSize = TD.getPointerSize();
+ const TargetFrameLowering &TFI = *TM.getFrameLowering();
+ StackDir = TFI.getStackGrowthDirection();
+ TRI = TM.getRegisterInfo();
+ TFI.getInitialFrameState(InitialFrameState);
}
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