#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/Target/TargetMachine.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSectionELF.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) {
TextSection = 0;
DataSection = 0;
- BSSSection_ = 0;
+ BSSSection = 0;
ReadOnlySection = 0;
- TLSDataSection = 0;
- TLSBSSSection = 0;
- CStringSection_ = 0;
+ StaticCtorSection = 0;
+ StaticDtorSection = 0;
+ LSDASection = 0;
+ EHFrameSection = 0;
+
+ DwarfAbbrevSection = 0;
+ DwarfInfoSection = 0;
+ DwarfLineSection = 0;
+ DwarfFrameSection = 0;
+ DwarfPubNamesSection = 0;
+ DwarfPubTypesSection = 0;
+ DwarfDebugInlineSection = 0;
+ DwarfStrSection = 0;
+ DwarfLocSection = 0;
+ DwarfARangesSection = 0;
+ DwarfRangesSection = 0;
+ DwarfMacroInfoSection = 0;
}
TargetLoweringObjectFile::~TargetLoweringObjectFile() {
return true;
}
-static bool isConstantString(const Constant *C) {
+/// IsNullTerminatedString - Return true if the specified constant (which is
+/// known to have a type that is an array of 1/2/4 byte elements) ends with a
+/// nul value and contains no other nuls in it.
+static bool IsNullTerminatedString(const Constant *C) {
+ const ArrayType *ATy = cast<ArrayType>(C->getType());
+
// 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())
+ if (const ConstantArray *CVA = dyn_cast<ConstantArray>(C)) {
+ if (ATy->getNumElements() == 0) return false;
+
+ ConstantInt *Null =
+ dyn_cast<ConstantInt>(CVA->getOperand(ATy->getNumElements()-1));
+ if (Null == 0 || Null->getZExtValue() != 0)
+ return false; // Not null terminated.
+
+ // Verify that the null doesn't occur anywhere else in the string.
+ for (unsigned i = 0, e = ATy->getNumElements()-1; i != e; ++i)
+ // Reject constantexpr elements etc.
+ if (!isa<ConstantInt>(CVA->getOperand(i)) ||
+ CVA->getOperand(i) == Null)
+ return false;
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 ATy->getNumElements() == 1;
return false;
}
-/// SectionKindForGlobal - This is a top-level target-independent classifier for
+/// getKindForGlobal - This is a top-level target-independent classifier for
/// a global variable. Given an global variable and information from TM, it
/// classifies the global in a variety of ways that make various target
/// implementations simpler. The target implementation is free to ignore this
/// extra info of course.
-static SectionKind SectionKindForGlobal(const GlobalValue *GV,
- const TargetMachine &TM) {
+SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalValue *GV,
+ const TargetMachine &TM){
+ assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() &&
+ "Can only be used for global definitions");
+
Reloc::Model ReloModel = TM.getRelocationModel();
// Early exit - functions should be always in text sections.
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (GVar == 0)
- return SectionKind::get(SectionKind::Text);
-
+ return SectionKind::getText();
// Handle thread-local data first.
if (GVar->isThreadLocal()) {
if (isSuitableForBSS(GVar))
- return SectionKind::get(SectionKind::ThreadBSS);
- return SectionKind::get(SectionKind::ThreadData);
+ return SectionKind::getThreadBSS();
+ return SectionKind::getThreadData();
}
// Variable can be easily put to BSS section.
if (isSuitableForBSS(GVar))
- return SectionKind::get(SectionKind::BSS);
+ return SectionKind::getBSS();
Constant *C = GVar->getInitializer();
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::get(SectionKind::MergeableCString);
-
+ // section of the right width.
+ if (const ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
+ if (const IntegerType *ITy =
+ dyn_cast<IntegerType>(ATy->getElementType())) {
+ if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
+ ITy->getBitWidth() == 32) &&
+ IsNullTerminatedString(C)) {
+ if (ITy->getBitWidth() == 8)
+ return SectionKind::getMergeable1ByteCString();
+ if (ITy->getBitWidth() == 16)
+ return SectionKind::getMergeable2ByteCString();
+
+ assert(ITy->getBitWidth() == 32 && "Unknown width");
+ return SectionKind::getMergeable4ByteCString();
+ }
+ }
+ }
+
// Otherwise, just drop it into a mergable constant section. If we have
// a section for this size, use it, otherwise use the arbitrary sized
// mergable section.
switch (TM.getTargetData()->getTypeAllocSize(C->getType())) {
- case 4: return SectionKind::get(SectionKind::MergeableConst4);
- case 8: return SectionKind::get(SectionKind::MergeableConst8);
- case 16: return SectionKind::get(SectionKind::MergeableConst16);
- default: return SectionKind::get(SectionKind::MergeableConst);
+ case 4: return SectionKind::getMergeableConst4();
+ case 8: return SectionKind::getMergeableConst8();
+ case 16: return SectionKind::getMergeableConst16();
+ default: return SectionKind::getMergeableConst();
}
case Constant::LocalRelocation:
// the linker doesn't take relocations into consideration when it tries to
// merge entries in the section.
if (ReloModel == Reloc::Static)
- return SectionKind::get(SectionKind::ReadOnly);
+ return SectionKind::getReadOnly();
// Otherwise, the dynamic linker needs to fix it up, put it in the
// writable data.rel.local section.
- return SectionKind::get(SectionKind::ReadOnlyWithRelLocal);
+ return SectionKind::getReadOnlyWithRelLocal();
case Constant::GlobalRelocations:
// In static relocation model, the linker will resolve all addresses, so
// the linker doesn't take relocations into consideration when it tries to
// merge entries in the section.
if (ReloModel == Reloc::Static)
- return SectionKind::get(SectionKind::ReadOnly);
+ return SectionKind::getReadOnly();
// Otherwise, the dynamic linker needs to fix it up, put it in the
// writable data.rel section.
- return SectionKind::get(SectionKind::ReadOnlyWithRel);
+ return SectionKind::getReadOnlyWithRel();
}
}
// globals together onto fewer pages, improving the locality of the dynamic
// linker.
if (ReloModel == Reloc::Static)
- return SectionKind::get(SectionKind::DataNoRel);
+ return SectionKind::getDataNoRel();
switch (C->getRelocationInfo()) {
default: llvm_unreachable("unknown relocation info kind");
case Constant::NoRelocation:
- return SectionKind::get(SectionKind::DataNoRel);
+ return SectionKind::getDataNoRel();
case Constant::LocalRelocation:
- return SectionKind::get(SectionKind::DataRelLocal);
+ return SectionKind::getDataRelLocal();
case Constant::GlobalRelocations:
- return SectionKind::get(SectionKind::DataRel);
+ return SectionKind::getDataRel();
}
}
/// the specified global variable or function definition. This should not
/// be passed external (or available externally) globals.
const MCSection *TargetLoweringObjectFile::
-SectionForGlobal(const GlobalValue *GV, Mangler *Mang,
+SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler *Mang,
const TargetMachine &TM) const {
- assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() &&
- "Can only be used for global definitions");
-
- SectionKind Kind = SectionKindForGlobal(GV, TM);
-
// Select section name.
- if (GV->hasSection()) {
- // If the target has special section hacks for specifically named globals,
- // return them now.
- if (const MCSection *TS = getSpecialCasedSectionGlobals(GV, Mang, Kind))
- return TS;
-
- // 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.
- Kind = getKindForNamedSection(GV->getSection().c_str(), Kind);
-
- return getOrCreateSection(GV->getSection().c_str(), false, Kind);
- }
-
+ if (GV->hasSection())
+ return getExplicitSectionGlobal(GV, Kind, Mang, TM);
+
// Use default section depending on the 'type' of global
return SelectSectionForGlobal(GV, Kind, Mang, TM);
}
+
// Lame default implementation. Calculate the section name for global.
const MCSection *
TargetLoweringObjectFile::SelectSectionForGlobal(const GlobalValue *GV,
if (Kind.isText())
return getTextSection();
- if (Kind.isBSS() && BSSSection_ != 0)
- return BSSSection_;
+ if (Kind.isBSS() && BSSSection != 0)
+ return BSSSection;
if (Kind.isReadOnly() && ReadOnlySection != 0)
return ReadOnlySection;
return getDataSection();
}
-/// getSectionForMergableConstant - Given a mergable constant with the
+/// getSectionForConstant - Given a mergable constant with the
/// specified size and relocation information, return a section that it
/// should be placed in.
const MCSection *
-TargetLoweringObjectFile::
-getSectionForMergeableConstant(SectionKind Kind) const {
+TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
if (Kind.isReadOnly() && ReadOnlySection != 0)
return ReadOnlySection;
}
-const MCSection *TargetLoweringObjectFile::
-getOrCreateSection(const char *Name, bool isDirective, SectionKind Kind) const {
- if (MCSection *S = Ctx->GetSection(Name))
- return S;
- return MCSection::Create(Name, isDirective, Kind, *Ctx);
-}
-
-
//===----------------------------------------------------------------------===//
// ELF
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
+
+TargetLoweringObjectFileELF::~TargetLoweringObjectFileELF() {
+ // If we have the section uniquing map, free it.
+ delete (ELFUniqueMapTy*)UniquingMap;
+}
+
+const MCSection *TargetLoweringObjectFileELF::
+getELFSection(StringRef Section, unsigned Type, unsigned Flags,
+ SectionKind Kind, bool IsExplicit) const {
+ if (UniquingMap == 0)
+ UniquingMap = new ELFUniqueMapTy();
+ ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)UniquingMap;
+
+ // Do the lookup, if we have a hit, return it.
+ const MCSectionELF *&Entry = Map[Section];
+ if (Entry) return Entry;
+
+ return Entry = MCSectionELF::Create(Section, Type, Flags, Kind, IsExplicit,
+ getContext());
+}
void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
+ if (UniquingMap != 0)
+ ((ELFUniqueMapTy*)UniquingMap)->clear();
TargetLoweringObjectFile::Initialize(Ctx, TM);
- if (!HasCrazyBSS)
- BSSSection_ = getOrCreateSection("\t.bss", true,
- SectionKind::get(SectionKind::BSS));
- else
- // PPC/Linux doesn't support the .bss directive, it needs .section .bss.
- // FIXME: Does .section .bss work everywhere??
- // FIXME2: this should just be handle by the section printer. We should get
- // away from syntactic view of the sections and MCSection should just be a
- // semantic view.
- BSSSection_ = getOrCreateSection("\t.bss", false,
- SectionKind::get(SectionKind::BSS));
+ BSSSection =
+ getELFSection(".bss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
+ SectionKind::getBSS());
- TextSection = getOrCreateSection("\t.text", true,
- SectionKind::get(SectionKind::Text));
- DataSection = getOrCreateSection("\t.data", true,
- SectionKind::get(SectionKind::DataRel));
- ReadOnlySection =
- getOrCreateSection("\t.rodata", false,
- SectionKind::get(SectionKind::ReadOnly));
- TLSDataSection =
- getOrCreateSection("\t.tdata", false,
- SectionKind::get(SectionKind::ThreadData));
- CStringSection_ = getOrCreateSection("\t.rodata.str", true,
- SectionKind::get(SectionKind::MergeableCString));
-
- TLSBSSSection = getOrCreateSection("\t.tbss", false,
- SectionKind::get(SectionKind::ThreadBSS));
-
- DataRelSection = getOrCreateSection("\t.data.rel", false,
- SectionKind::get(SectionKind::DataRel));
- DataRelLocalSection = getOrCreateSection("\t.data.rel.local", false,
- SectionKind::get(SectionKind::DataRelLocal));
- DataRelROSection = getOrCreateSection("\t.data.rel.ro", false,
- SectionKind::get(SectionKind::ReadOnlyWithRel));
- DataRelROLocalSection =
- getOrCreateSection("\t.data.rel.ro.local", false,
- SectionKind::get(SectionKind::ReadOnlyWithRelLocal));
+ TextSection =
+ getELFSection(".text", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_EXECINSTR | MCSectionELF::SHF_ALLOC,
+ SectionKind::getText());
+
+ DataSection =
+ getELFSection(".data", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
+ SectionKind::getDataRel());
+
+ ReadOnlySection =
+ getELFSection(".rodata", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC,
+ SectionKind::getReadOnly());
+
+ TLSDataSection =
+ getELFSection(".tdata", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS |
+ MCSectionELF::SHF_WRITE, SectionKind::getThreadData());
+
+ TLSBSSSection =
+ getELFSection(".tbss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS |
+ MCSectionELF::SHF_WRITE, SectionKind::getThreadBSS());
+
+ DataRelSection =
+ getELFSection(".data.rel", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+
+ DataRelLocalSection =
+ getELFSection(".data.rel.local", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRelLocal());
+
+ DataRelROSection =
+ getELFSection(".data.rel.ro", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getReadOnlyWithRel());
+
+ DataRelROLocalSection =
+ getELFSection(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getReadOnlyWithRelLocal());
- MergeableConst4Section = getOrCreateSection(".rodata.cst4", false,
- SectionKind::get(SectionKind::MergeableConst4));
- MergeableConst8Section = getOrCreateSection(".rodata.cst8", false,
- SectionKind::get(SectionKind::MergeableConst8));
- MergeableConst16Section = getOrCreateSection(".rodata.cst16", false,
- SectionKind::get(SectionKind::MergeableConst16));
+ MergeableConst4Section =
+ getELFSection(".rodata.cst4", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
+ SectionKind::getMergeableConst4());
+
+ MergeableConst8Section =
+ getELFSection(".rodata.cst8", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
+ SectionKind::getMergeableConst8());
+
+ MergeableConst16Section =
+ getELFSection(".rodata.cst16", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
+ SectionKind::getMergeableConst16());
+
+ StaticCtorSection =
+ getELFSection(".ctors", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+
+ StaticDtorSection =
+ getELFSection(".dtors", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+
+ // Exception Handling Sections.
+
+ // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
+ // it contains relocatable pointers. In PIC mode, this is probably a big
+ // runtime hit for C++ apps. Either the contents of the LSDA need to be
+ // adjusted or this should be a data section.
+ LSDASection =
+ getELFSection(".gcc_except_table", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC, SectionKind::getReadOnly());
+ EHFrameSection =
+ getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+
+ // Debug Info Sections.
+ DwarfAbbrevSection =
+ getELFSection(".debug_abbrev", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfInfoSection =
+ getELFSection(".debug_info", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfLineSection =
+ getELFSection(".debug_line", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfFrameSection =
+ getELFSection(".debug_frame", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfPubNamesSection =
+ getELFSection(".debug_pubnames", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfPubTypesSection =
+ getELFSection(".debug_pubtypes", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfStrSection =
+ getELFSection(".debug_str", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfLocSection =
+ getELFSection(".debug_loc", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfARangesSection =
+ getELFSection(".debug_aranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfRangesSection =
+ getELFSection(".debug_ranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfMacroInfoSection =
+ getELFSection(".debug_macinfo", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
}
-SectionKind TargetLoweringObjectFileELF::
-getKindForNamedSection(const char *Name, SectionKind K) const {
+static SectionKind
+getELFKindForNamedSection(const char *Name, SectionKind K) {
if (Name[0] != '.') return K;
// Some lame default implementation based on some magic section names.
strncmp(Name, ".llvm.linkonce.b.", 17) == 0 ||
strncmp(Name, ".gnu.linkonce.sb.", 17) == 0 ||
strncmp(Name, ".llvm.linkonce.sb.", 18) == 0)
- return SectionKind::get(SectionKind::BSS);
+ return SectionKind::getBSS();
if (strcmp(Name, ".tdata") == 0 ||
strncmp(Name, ".tdata.", 7) == 0 ||
strncmp(Name, ".gnu.linkonce.td.", 17) == 0 ||
strncmp(Name, ".llvm.linkonce.td.", 18) == 0)
- return SectionKind::get(SectionKind::ThreadData);
+ return SectionKind::getThreadData();
if (strcmp(Name, ".tbss") == 0 ||
strncmp(Name, ".tbss.", 6) == 0 ||
strncmp(Name, ".gnu.linkonce.tb.", 17) == 0 ||
strncmp(Name, ".llvm.linkonce.tb.", 18) == 0)
- return SectionKind::get(SectionKind::ThreadBSS);
+ return SectionKind::getThreadBSS();
return K;
}
-void TargetLoweringObjectFileELF::
-getSectionFlagsAsString(SectionKind Kind, SmallVectorImpl<char> &Str) const {
- Str.push_back(',');
- Str.push_back('"');
+
+static unsigned
+getELFSectionType(const char *Name, SectionKind K) {
+
+ if (strcmp(Name, ".init_array") == 0)
+ return MCSectionELF::SHT_INIT_ARRAY;
+
+ if (strcmp(Name, ".fini_array") == 0)
+ return MCSectionELF::SHT_FINI_ARRAY;
+
+ if (strcmp(Name, ".preinit_array") == 0)
+ return MCSectionELF::SHT_PREINIT_ARRAY;
+
+ if (K.isBSS() || K.isThreadBSS())
+ return MCSectionELF::SHT_NOBITS;
+
+ return MCSectionELF::SHT_PROGBITS;
+}
+
+
+static unsigned
+getELFSectionFlags(SectionKind K) {
+ unsigned Flags = 0;
+
+ if (!K.isMetadata())
+ Flags |= MCSectionELF::SHF_ALLOC;
- if (!Kind.isMetadata())
- Str.push_back('a');
- if (Kind.isText())
- Str.push_back('x');
- if (Kind.isWriteable())
- Str.push_back('w');
- if (Kind.isMergeableCString() ||
- Kind.isMergeableConst4() ||
- Kind.isMergeableConst8() ||
- Kind.isMergeableConst16())
- Str.push_back('M');
- if (Kind.isMergeableCString())
- Str.push_back('S');
- if (Kind.isThreadLocal())
- Str.push_back('T');
-
- Str.push_back('"');
- Str.push_back(',');
-
- // If comment string is '@', e.g. as on ARM - use '%' instead
- if (AtIsCommentChar)
- Str.push_back('%');
- else
- Str.push_back('@');
-
- const char *KindStr;
- if (Kind.isBSS() || Kind.isThreadBSS())
- KindStr = "nobits";
- else
- KindStr = "progbits";
-
- Str.append(KindStr, KindStr+strlen(KindStr));
-
- if (Kind.isMergeableCString()) {
- // TODO: Eventually handle multiple byte character strings. For now, all
- // mergable C strings are single byte.
- Str.push_back(',');
- Str.push_back('1');
- } else if (Kind.isMergeableConst4()) {
- Str.push_back(',');
- Str.push_back('4');
- } else if (Kind.isMergeableConst8()) {
- Str.push_back(',');
- Str.push_back('8');
- } else if (Kind.isMergeableConst16()) {
- Str.push_back(',');
- Str.push_back('1');
- Str.push_back('6');
- }
+ if (K.isText())
+ Flags |= MCSectionELF::SHF_EXECINSTR;
+
+ if (K.isWriteable())
+ Flags |= MCSectionELF::SHF_WRITE;
+
+ if (K.isThreadLocal())
+ Flags |= MCSectionELF::SHF_TLS;
+
+ // K.isMergeableConst() is left out to honour PR4650
+ if (K.isMergeableCString() || K.isMergeableConst4() ||
+ K.isMergeableConst8() || K.isMergeableConst16())
+ Flags |= MCSectionELF::SHF_MERGE;
+
+ if (K.isMergeableCString())
+ Flags |= MCSectionELF::SHF_STRINGS;
+
+ return Flags;
}
+const MCSection *TargetLoweringObjectFileELF::
+getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const {
+ const char *SectionName = GV->getSection().c_str();
+
+ // Infer section flags from the section name if we can.
+ Kind = getELFKindForNamedSection(SectionName, Kind);
+
+ return getELFSection(SectionName,
+ getELFSectionType(SectionName, Kind),
+ getELFSectionFlags(Kind), Kind, true);
+}
+
static const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) {
if (Kind.isText()) return ".gnu.linkonce.t.";
if (Kind.isReadOnly()) return ".gnu.linkonce.r.";
if (GV->isWeakForLinker()) {
const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
std::string Name = Mang->makeNameProper(GV->getNameStr());
- return getOrCreateSection((Prefix+Name).c_str(), false, Kind);
+
+ return getELFSection((Prefix+Name).c_str(),
+ getELFSectionType((Prefix+Name).c_str(), Kind),
+ getELFSectionFlags(Kind),
+ Kind);
}
if (Kind.isText()) return TextSection;
- if (Kind.isMergeableCString()) {
- assert(CStringSection_ && "Should have string section prefix");
+ if (Kind.isMergeable1ByteCString() ||
+ Kind.isMergeable2ByteCString() ||
+ Kind.isMergeable4ByteCString()) {
// We also need alignment here.
// FIXME: this is getting the alignment of the character, not the
unsigned Align =
TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV));
- std::string Name = CStringSection_->getName() + "1." + utostr(Align);
- return getOrCreateSection(Name.c_str(), false,
- SectionKind::get(SectionKind::MergeableCString));
+ const char *SizeSpec = ".rodata.str1.";
+ if (Kind.isMergeable2ByteCString())
+ SizeSpec = ".rodata.str2.";
+ else if (Kind.isMergeable4ByteCString())
+ SizeSpec = ".rodata.str4.";
+ else
+ assert(Kind.isMergeable1ByteCString() && "unknown string width");
+
+
+ std::string Name = SizeSpec + utostr(Align);
+ return getELFSection(Name.c_str(), MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_MERGE |
+ MCSectionELF::SHF_STRINGS,
+ Kind);
}
if (Kind.isMergeableConst()) {
- if (Kind.isMergeableConst4())
+ if (Kind.isMergeableConst4() && MergeableConst4Section)
return MergeableConst4Section;
- if (Kind.isMergeableConst8())
+ if (Kind.isMergeableConst8() && MergeableConst8Section)
return MergeableConst8Section;
- if (Kind.isMergeableConst16())
+ if (Kind.isMergeableConst16() && MergeableConst16Section)
return MergeableConst16Section;
return ReadOnlySection; // .const
}
if (Kind.isThreadData()) return TLSDataSection;
if (Kind.isThreadBSS()) return TLSBSSSection;
- if (Kind.isBSS()) return BSSSection_;
+ if (Kind.isBSS()) return BSSSection;
if (Kind.isDataNoRel()) return DataSection;
if (Kind.isDataRelLocal()) return DataRelLocalSection;
return DataRelROSection;
}
-/// getSectionForMergeableConstant - Given a mergeable constant with the
+/// getSectionForConstant - Given a mergeable constant with the
/// specified size and relocation information, return a section that it
/// should be placed in.
const MCSection *TargetLoweringObjectFileELF::
-getSectionForMergeableConstant(SectionKind Kind) const {
- if (Kind.isMergeableConst4())
+getSectionForConstant(SectionKind Kind) const {
+ if (Kind.isMergeableConst4() && MergeableConst4Section)
return MergeableConst4Section;
- if (Kind.isMergeableConst8())
+ if (Kind.isMergeableConst8() && MergeableConst8Section)
return MergeableConst8Section;
- if (Kind.isMergeableConst16())
+ if (Kind.isMergeableConst16() && MergeableConst16Section)
return MergeableConst16Section;
if (Kind.isReadOnly())
return ReadOnlySection;
// MachO
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
+
+TargetLoweringObjectFileMachO::~TargetLoweringObjectFileMachO() {
+ // If we have the MachO uniquing map, free it.
+ delete (MachOUniqueMapTy*)UniquingMap;
+}
+
+
+const MCSectionMachO *TargetLoweringObjectFileMachO::
+getMachOSection(const StringRef &Segment, const StringRef &Section,
+ unsigned TypeAndAttributes,
+ unsigned Reserved2, SectionKind Kind) const {
+ // We unique sections by their segment/section pair. The returned section
+ // may not have the same flags as the requested section, if so this should be
+ // diagnosed by the client as an error.
+
+ // Create the map if it doesn't already exist.
+ if (UniquingMap == 0)
+ UniquingMap = new MachOUniqueMapTy();
+ MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)UniquingMap;
+
+ // Form the name to look up.
+ SmallString<64> Name;
+ Name += Segment;
+ Name.push_back(',');
+ Name += Section;
+
+ // Do the lookup, if we have a hit, return it.
+ const MCSectionMachO *&Entry = Map[Name.str()];
+ if (Entry) return Entry;
+
+ // Otherwise, return a new section.
+ return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes,
+ Reserved2, Kind, getContext());
+}
+
+
void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
+ if (UniquingMap != 0)
+ ((MachOUniqueMapTy*)UniquingMap)->clear();
TargetLoweringObjectFile::Initialize(Ctx, TM);
- TextSection = getOrCreateSection("\t.text", true,
- SectionKind::get(SectionKind::Text));
- DataSection = getOrCreateSection("\t.data", true,
- SectionKind::get(SectionKind::DataRel));
-
- CStringSection_ = getOrCreateSection("\t.cstring", true,
- SectionKind::get(SectionKind::MergeableCString));
- FourByteConstantSection = getOrCreateSection("\t.literal4\n", true,
- SectionKind::get(SectionKind::MergeableConst4));
- EightByteConstantSection = getOrCreateSection("\t.literal8\n", true,
- SectionKind::get(SectionKind::MergeableConst8));
+
+ TextSection // .text
+ = getMachOSection("__TEXT", "__text",
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ SectionKind::getText());
+ DataSection // .data
+ = getMachOSection("__DATA", "__data", 0, SectionKind::getDataRel());
+
+ CStringSection // .cstring
+ = getMachOSection("__TEXT", "__cstring", MCSectionMachO::S_CSTRING_LITERALS,
+ SectionKind::getMergeable1ByteCString());
+ UStringSection
+ = getMachOSection("__TEXT","__ustring", 0,
+ SectionKind::getMergeable2ByteCString());
+ FourByteConstantSection // .literal4
+ = getMachOSection("__TEXT", "__literal4", MCSectionMachO::S_4BYTE_LITERALS,
+ SectionKind::getMergeableConst4());
+ EightByteConstantSection // .literal8
+ = getMachOSection("__TEXT", "__literal8", MCSectionMachO::S_8BYTE_LITERALS,
+ SectionKind::getMergeableConst8());
// ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
// to using it in -static mode.
+ SixteenByteConstantSection = 0;
if (TM.getRelocationModel() != Reloc::Static &&
TM.getTargetData()->getPointerSize() == 32)
- SixteenByteConstantSection =
- getOrCreateSection("\t.literal16\n", true,
- SectionKind::get(SectionKind::MergeableConst16));
- else
- SixteenByteConstantSection = 0;
-
- ReadOnlySection = getOrCreateSection("\t.const", true,
- SectionKind::get(SectionKind::ReadOnly));
-
- TextCoalSection =
- getOrCreateSection("\t__TEXT,__textcoal_nt,coalesced,pure_instructions",
- false, SectionKind::get(SectionKind::Text));
- ConstTextCoalSection = getOrCreateSection("\t__TEXT,__const_coal,coalesced",
- false,
- SectionKind::get(SectionKind::Text));
- ConstDataCoalSection = getOrCreateSection("\t__DATA,__const_coal,coalesced",
- false,
- SectionKind::get(SectionKind::Text));
- ConstDataSection = getOrCreateSection("\t.const_data", true,
- SectionKind::get(SectionKind::ReadOnlyWithRel));
- DataCoalSection = getOrCreateSection("\t__DATA,__datacoal_nt,coalesced",
- false,
- SectionKind::get(SectionKind::DataRel));
+ SixteenByteConstantSection = // .literal16
+ getMachOSection("__TEXT", "__literal16",MCSectionMachO::S_16BYTE_LITERALS,
+ SectionKind::getMergeableConst16());
+
+ ReadOnlySection // .const
+ = getMachOSection("__TEXT", "__const", 0, SectionKind::getReadOnly());
+
+ TextCoalSection
+ = getMachOSection("__TEXT", "__textcoal_nt",
+ MCSectionMachO::S_COALESCED |
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ SectionKind::getText());
+ ConstTextCoalSection
+ = getMachOSection("__TEXT", "__const_coal", MCSectionMachO::S_COALESCED,
+ SectionKind::getText());
+ ConstDataCoalSection
+ = getMachOSection("__DATA","__const_coal", MCSectionMachO::S_COALESCED,
+ SectionKind::getText());
+ ConstDataSection // .const_data
+ = getMachOSection("__DATA", "__const", 0,
+ SectionKind::getReadOnlyWithRel());
+ DataCoalSection
+ = getMachOSection("__DATA","__datacoal_nt", MCSectionMachO::S_COALESCED,
+ SectionKind::getDataRel());
+
+
+ LazySymbolPointerSection
+ = getMachOSection("__DATA", "__la_symbol_ptr",
+ MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
+ SectionKind::getMetadata());
+ NonLazySymbolPointerSection
+ = getMachOSection("__DATA", "__nl_symbol_ptr",
+ MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
+ SectionKind::getMetadata());
+
+ if (TM.getRelocationModel() == Reloc::Static) {
+ StaticCtorSection
+ = getMachOSection("__TEXT", "__constructor", 0,SectionKind::getDataRel());
+ StaticDtorSection
+ = getMachOSection("__TEXT", "__destructor", 0, SectionKind::getDataRel());
+ } else {
+ StaticCtorSection
+ = getMachOSection("__DATA", "__mod_init_func",
+ MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
+ SectionKind::getDataRel());
+ StaticDtorSection
+ = getMachOSection("__DATA", "__mod_term_func",
+ MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
+ SectionKind::getDataRel());
+ }
+
+ // Exception Handling.
+ LSDASection = getMachOSection("__DATA", "__gcc_except_tab", 0,
+ SectionKind::getDataRel());
+ EHFrameSection =
+ getMachOSection("__TEXT", "__eh_frame",
+ MCSectionMachO::S_COALESCED |
+ MCSectionMachO::S_ATTR_NO_TOC |
+ MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
+ MCSectionMachO::S_ATTR_LIVE_SUPPORT,
+ SectionKind::getReadOnly());
+
+ // Debug Information.
+ DwarfAbbrevSection =
+ getMachOSection("__DWARF", "__debug_abbrev", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfInfoSection =
+ getMachOSection("__DWARF", "__debug_info", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfLineSection =
+ getMachOSection("__DWARF", "__debug_line", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfFrameSection =
+ getMachOSection("__DWARF", "__debug_frame", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfPubNamesSection =
+ getMachOSection("__DWARF", "__debug_pubnames", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfPubTypesSection =
+ getMachOSection("__DWARF", "__debug_pubtypes", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfStrSection =
+ getMachOSection("__DWARF", "__debug_str", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfLocSection =
+ getMachOSection("__DWARF", "__debug_loc", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfARangesSection =
+ getMachOSection("__DWARF", "__debug_aranges", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfRangesSection =
+ getMachOSection("__DWARF", "__debug_ranges", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfMacroInfoSection =
+ getMachOSection("__DWARF", "__debug_macinfo", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+ DwarfDebugInlineSection =
+ getMachOSection("__DWARF", "__debug_inlined", MCSectionMachO::S_ATTR_DEBUG,
+ SectionKind::getMetadata());
+}
+
+const MCSection *TargetLoweringObjectFileMachO::
+getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const {
+ // Parse the section specifier and create it if valid.
+ StringRef Segment, Section;
+ unsigned TAA, StubSize;
+ std::string ErrorCode =
+ MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
+ TAA, StubSize);
+ if (!ErrorCode.empty()) {
+ // If invalid, report the error with llvm_report_error.
+ llvm_report_error("Global variable '" + GV->getNameStr() +
+ "' has an invalid section specifier '" + GV->getSection()+
+ "': " + ErrorCode + ".");
+ // Fall back to dropping it into the data section.
+ return DataSection;
+ }
+
+ // Get the section.
+ const MCSectionMachO *S =
+ getMachOSection(Segment, Section, TAA, StubSize, Kind);
+
+ // Okay, now that we got the section, verify that the TAA & StubSize agree.
+ // If the user declared multiple globals with different section flags, we need
+ // to reject it here.
+ if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) {
+ // If invalid, report the error with llvm_report_error.
+ llvm_report_error("Global variable '" + GV->getNameStr() +
+ "' section type or attributes does not match previous"
+ " section specifier");
+ }
+
+ return S;
}
const MCSection *TargetLoweringObjectFileMachO::
}
// FIXME: Alignment check should be handled by section classifier.
- if (Kind.isMergeableCString()) {
- Constant *C = cast<GlobalVariable>(GV)->getInitializer();
- const Type *Ty = cast<ArrayType>(C->getType())->getElementType();
- const TargetData &TD = *TM.getTargetData();
- unsigned Size = TD.getTypeAllocSize(Ty);
- if (Size) {
- unsigned Align = TD.getPreferredAlignment(cast<GlobalVariable>(GV));
- if (Align <= 32)
- return CStringSection_;
+ if (Kind.isMergeable1ByteCString() ||
+ Kind.isMergeable2ByteCString()) {
+ if (TM.getTargetData()->getPreferredAlignment(
+ cast<GlobalVariable>(GV)) < 32) {
+ if (Kind.isMergeable1ByteCString())
+ return CStringSection;
+ assert(Kind.isMergeable2ByteCString());
+ return UStringSection;
}
-
- return ReadOnlySection;
}
if (Kind.isMergeableConst()) {
return EightByteConstantSection;
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
return SixteenByteConstantSection;
- return ReadOnlySection; // .const
}
-
- // FIXME: ROData -> const in -static mode that is relocatable but they happen
- // by the static linker. Why not mergeable?
+
+ // Otherwise, if it is readonly, but not something we can specially optimize,
+ // just drop it in .const.
if (Kind.isReadOnly())
return ReadOnlySection;
}
const MCSection *
-TargetLoweringObjectFileMachO::
-getSectionForMergeableConstant(SectionKind Kind) const {
+TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const {
// If this constant requires a relocation, we have to put it in the data
// segment, not in the text segment.
if (Kind.isDataRel())
// COFF
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
+
+TargetLoweringObjectFileCOFF::~TargetLoweringObjectFileCOFF() {
+ delete (COFFUniqueMapTy*)UniquingMap;
+}
+
+
+const MCSection *TargetLoweringObjectFileCOFF::
+getCOFFSection(const char *Name, bool isDirective, SectionKind Kind) const {
+ // Create the map if it doesn't already exist.
+ if (UniquingMap == 0)
+ UniquingMap = new MachOUniqueMapTy();
+ COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)UniquingMap;
+
+ // Do the lookup, if we have a hit, return it.
+ const MCSectionCOFF *&Entry = Map[Name];
+ if (Entry) return Entry;
+
+ return Entry = MCSectionCOFF::Create(Name, isDirective, Kind, getContext());
+}
+
void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
+ if (UniquingMap != 0)
+ ((COFFUniqueMapTy*)UniquingMap)->clear();
TargetLoweringObjectFile::Initialize(Ctx, TM);
- TextSection = getOrCreateSection("\t.text", true,
- SectionKind::get(SectionKind::Text));
- DataSection = getOrCreateSection("\t.data", true,
- SectionKind::get(SectionKind::DataRel));
+ TextSection = getCOFFSection("\t.text", true, SectionKind::getText());
+ DataSection = getCOFFSection("\t.data", true, SectionKind::getDataRel());
+ StaticCtorSection =
+ getCOFFSection(".ctors", false, SectionKind::getDataRel());
+ StaticDtorSection =
+ getCOFFSection(".dtors", false, SectionKind::getDataRel());
+
+ // FIXME: We're emitting LSDA info into a readonly section on COFF, even
+ // though it contains relocatable pointers. In PIC mode, this is probably a
+ // big runtime hit for C++ apps. Either the contents of the LSDA need to be
+ // adjusted or this should be a data section.
+ LSDASection =
+ getCOFFSection(".gcc_except_table", false, SectionKind::getReadOnly());
+ EHFrameSection =
+ getCOFFSection(".eh_frame", false, SectionKind::getDataRel());
+
+ // Debug info.
+ // FIXME: Don't use 'directive' mode here.
+ DwarfAbbrevSection =
+ getCOFFSection("\t.section\t.debug_abbrev,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfInfoSection =
+ getCOFFSection("\t.section\t.debug_info,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfLineSection =
+ getCOFFSection("\t.section\t.debug_line,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfFrameSection =
+ getCOFFSection("\t.section\t.debug_frame,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfPubNamesSection =
+ getCOFFSection("\t.section\t.debug_pubnames,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfPubTypesSection =
+ getCOFFSection("\t.section\t.debug_pubtypes,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfStrSection =
+ getCOFFSection("\t.section\t.debug_str,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfLocSection =
+ getCOFFSection("\t.section\t.debug_loc,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfARangesSection =
+ getCOFFSection("\t.section\t.debug_aranges,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfRangesSection =
+ getCOFFSection("\t.section\t.debug_ranges,\"dr\"",
+ true, SectionKind::getMetadata());
+ DwarfMacroInfoSection =
+ getCOFFSection("\t.section\t.debug_macinfo,\"dr\"",
+ true, SectionKind::getMetadata());
}
-void TargetLoweringObjectFileCOFF::
-getSectionFlagsAsString(SectionKind Kind, SmallVectorImpl<char> &Str) const {
- // FIXME: Inefficient.
- std::string Res = ",\"";
- if (Kind.isText())
- Res += 'x';
- if (Kind.isWriteable())
- Res += 'w';
- Res += "\"";
-
- Str.append(Res.begin(), Res.end());
+const MCSection *TargetLoweringObjectFileCOFF::
+getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const {
+ return getCOFFSection(GV->getSection().c_str(), false, Kind);
}
static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
if (GV->isWeakForLinker()) {
const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind);
std::string Name = Mang->makeNameProper(GV->getNameStr());
- return getOrCreateSection((Prefix+Name).c_str(), false, Kind);
+ return getCOFFSection((Prefix+Name).c_str(), false, Kind);
}
if (Kind.isText())
return getTextSection();
- if (Kind.isReadOnly() && ReadOnlySection != 0)
- return ReadOnlySection;
-
return getDataSection();
}
projects / oota-llvm.git / blobdiff