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-rw-r--r--lib/Target/X86/X86TargetAsmInfo.cpp461
1 files changed, 461 insertions, 0 deletions
diff --git a/lib/Target/X86/X86TargetAsmInfo.cpp b/lib/Target/X86/X86TargetAsmInfo.cpp
new file mode 100644
index 0000000..5dda5f4
--- /dev/null
+++ b/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -0,0 +1,461 @@
+//===-- X86TargetAsmInfo.cpp - X86 asm properties ---------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declarations of the X86TargetAsmInfo properties.
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86TargetAsmInfo.h"
+#include "X86TargetMachine.h"
+#include "X86Subtarget.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/InlineAsm.h"
+#include "llvm/Instructions.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Dwarf.h"
+
+using namespace llvm;
+using namespace llvm::dwarf;
+
+const char *const llvm::x86_asm_table[] = {
+ "{si}", "S",
+ "{di}", "D",
+ "{ax}", "a",
+ "{cx}", "c",
+ "{memory}", "memory",
+ "{flags}", "",
+ "{dirflag}", "",
+ "{fpsr}", "",
+ "{cc}", "cc",
+ 0,0};
+
+X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(const X86TargetMachine &TM):
+ X86TargetAsmInfo<DarwinTargetAsmInfo>(TM) {
+ const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
+ bool is64Bit = Subtarget->is64Bit();
+
+ AlignmentIsInBytes = false;
+ TextAlignFillValue = 0x90;
+ GlobalPrefix = "_";
+ if (!is64Bit)
+ Data64bitsDirective = 0; // we can't emit a 64-bit unit
+ ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
+ PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
+ LessPrivateGlobalPrefix = "l"; // Marker for some ObjC metadata
+ BSSSection = 0; // no BSS section.
+ ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
+ if (TM.getRelocationModel() != Reloc::Static)
+ ConstantPoolSection = "\t.const_data";
+ else
+ ConstantPoolSection = "\t.const\n";
+ JumpTableDataSection = "\t.const\n";
+ CStringSection = "\t.cstring";
+ // FIXME: Why don't always use this section?
+ if (is64Bit) {
+ SixteenByteConstantSection = getUnnamedSection("\t.literal16\n",
+ SectionFlags::Mergeable);
+ }
+ LCOMMDirective = "\t.lcomm\t";
+ SwitchToSectionDirective = "\t.section ";
+ StringConstantPrefix = "\1LC";
+ // Leopard and above support aligned common symbols.
+ COMMDirectiveTakesAlignment = (Subtarget->getDarwinVers() >= 9);
+ HasDotTypeDotSizeDirective = false;
+ HasSingleParameterDotFile = false;
+ NonLocalEHFrameLabel = true;
+ if (TM.getRelocationModel() == Reloc::Static) {
+ StaticCtorsSection = ".constructor";
+ StaticDtorsSection = ".destructor";
+ } else {
+ StaticCtorsSection = ".mod_init_func";
+ StaticDtorsSection = ".mod_term_func";
+ }
+ if (is64Bit) {
+ PersonalityPrefix = "";
+ PersonalitySuffix = "+4@GOTPCREL";
+ } else {
+ PersonalityPrefix = "L";
+ PersonalitySuffix = "$non_lazy_ptr";
+ }
+ NeedsIndirectEncoding = true;
+ InlineAsmStart = "## InlineAsm Start";
+ InlineAsmEnd = "## InlineAsm End";
+ CommentString = "##";
+ SetDirective = "\t.set";
+ PCSymbol = ".";
+ UsedDirective = "\t.no_dead_strip\t";
+ WeakDefDirective = "\t.weak_definition ";
+ WeakRefDirective = "\t.weak_reference ";
+ HiddenDirective = "\t.private_extern ";
+ ProtectedDirective = "\t.globl\t";
+
+ // In non-PIC modes, emit a special label before jump tables so that the
+ // linker can perform more accurate dead code stripping.
+ if (TM.getRelocationModel() != Reloc::PIC_) {
+ // Emit a local label that is preserved until the linker runs.
+ JumpTableSpecialLabelPrefix = "l";
+ }
+
+ SupportsDebugInformation = true;
+ NeedsSet = true;
+ DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
+ DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
+ DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
+ DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
+ DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
+ DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
+ DwarfDebugInlineSection = ".section __DWARF,__debug_inlined,regular,debug";
+ DwarfUsesInlineInfoSection = true;
+ DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
+ DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
+ DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
+ DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
+ DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
+
+ // Exceptions handling
+ SupportsExceptionHandling = true;
+ GlobalEHDirective = "\t.globl\t";
+ SupportsWeakOmittedEHFrame = false;
+ AbsoluteEHSectionOffsets = false;
+ DwarfEHFrameSection =
+ ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
+ DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
+}
+
+unsigned
+X86DarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
+ bool Global) const {
+ if (Reason == DwarfEncoding::Functions && Global)
+ return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
+ else if (Reason == DwarfEncoding::CodeLabels || !Global)
+ return DW_EH_PE_pcrel;
+ else
+ return DW_EH_PE_absptr;
+}
+
+const char *
+X86DarwinTargetAsmInfo::getEHGlobalPrefix() const
+{
+ const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
+ if (Subtarget->getDarwinVers() > 9)
+ return PrivateGlobalPrefix;
+ else
+ return "";
+}
+
+X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM):
+ X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
+
+ CStringSection = ".rodata.str";
+ PrivateGlobalPrefix = ".L";
+ WeakRefDirective = "\t.weak\t";
+ SetDirective = "\t.set\t";
+ PCSymbol = ".";
+
+ // Set up DWARF directives
+ HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
+
+ // Debug Information
+ AbsoluteDebugSectionOffsets = true;
+ SupportsDebugInformation = true;
+ DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
+ DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
+ DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
+ DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
+ DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
+ DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
+ DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
+ DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
+ DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
+ DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
+ DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
+
+ // Exceptions handling
+ SupportsExceptionHandling = true;
+ AbsoluteEHSectionOffsets = false;
+ DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
+ DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
+
+ // On Linux we must declare when we can use a non-executable stack.
+ if (TM.getSubtarget<X86Subtarget>().isLinux())
+ NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
+}
+
+unsigned
+X86ELFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
+ bool Global) const {
+ CodeModel::Model CM = TM.getCodeModel();
+ bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
+
+ if (TM.getRelocationModel() == Reloc::PIC_) {
+ unsigned Format = 0;
+
+ if (!is64Bit)
+ // 32 bit targets always encode pointers as 4 bytes
+ Format = DW_EH_PE_sdata4;
+ else {
+ // 64 bit targets encode pointers in 4 bytes iff:
+ // - code model is small OR
+ // - code model is medium and we're emitting externally visible symbols
+ // or any code symbols
+ if (CM == CodeModel::Small ||
+ (CM == CodeModel::Medium && (Global ||
+ Reason != DwarfEncoding::Data)))
+ Format = DW_EH_PE_sdata4;
+ else
+ Format = DW_EH_PE_sdata8;
+ }
+
+ if (Global)
+ Format |= DW_EH_PE_indirect;
+
+ return (Format | DW_EH_PE_pcrel);
+ } else {
+ if (is64Bit &&
+ (CM == CodeModel::Small ||
+ (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
+ return DW_EH_PE_udata4;
+ else
+ return DW_EH_PE_absptr;
+ }
+}
+
+X86COFFTargetAsmInfo::X86COFFTargetAsmInfo(const X86TargetMachine &TM):
+ X86GenericTargetAsmInfo(TM) {
+
+ GlobalPrefix = "_";
+ LCOMMDirective = "\t.lcomm\t";
+ COMMDirectiveTakesAlignment = false;
+ HasDotTypeDotSizeDirective = false;
+ HasSingleParameterDotFile = false;
+ StaticCtorsSection = "\t.section .ctors,\"aw\"";
+ StaticDtorsSection = "\t.section .dtors,\"aw\"";
+ HiddenDirective = NULL;
+ PrivateGlobalPrefix = "L"; // Prefix for private global symbols
+ WeakRefDirective = "\t.weak\t";
+ SetDirective = "\t.set\t";
+
+ // Set up DWARF directives
+ HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
+ AbsoluteDebugSectionOffsets = true;
+ AbsoluteEHSectionOffsets = false;
+ SupportsDebugInformation = true;
+ DwarfSectionOffsetDirective = "\t.secrel32\t";
+ DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
+ DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
+ DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
+ DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
+ DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
+ DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
+ DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
+ DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
+ DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
+ DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
+ DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
+}
+
+unsigned
+X86COFFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
+ bool Global) const {
+ CodeModel::Model CM = TM.getCodeModel();
+ bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
+
+ if (TM.getRelocationModel() == Reloc::PIC_) {
+ unsigned Format = 0;
+
+ if (!is64Bit)
+ // 32 bit targets always encode pointers as 4 bytes
+ Format = DW_EH_PE_sdata4;
+ else {
+ // 64 bit targets encode pointers in 4 bytes iff:
+ // - code model is small OR
+ // - code model is medium and we're emitting externally visible symbols
+ // or any code symbols
+ if (CM == CodeModel::Small ||
+ (CM == CodeModel::Medium && (Global ||
+ Reason != DwarfEncoding::Data)))
+ Format = DW_EH_PE_sdata4;
+ else
+ Format = DW_EH_PE_sdata8;
+ }
+
+ if (Global)
+ Format |= DW_EH_PE_indirect;
+
+ return (Format | DW_EH_PE_pcrel);
+ } else {
+ if (is64Bit &&
+ (CM == CodeModel::Small ||
+ (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
+ return DW_EH_PE_udata4;
+ else
+ return DW_EH_PE_absptr;
+ }
+}
+
+std::string
+X86COFFTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
+ SectionKind::Kind kind) const {
+ switch (kind) {
+ case SectionKind::Text:
+ return ".text$linkonce" + GV->getName();
+ case SectionKind::Data:
+ case SectionKind::BSS:
+ case SectionKind::ThreadData:
+ case SectionKind::ThreadBSS:
+ return ".data$linkonce" + GV->getName();
+ case SectionKind::ROData:
+ case SectionKind::RODataMergeConst:
+ case SectionKind::RODataMergeStr:
+ return ".rdata$linkonce" + GV->getName();
+ default:
+ assert(0 && "Unknown section kind");
+ }
+ return NULL;
+}
+
+std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {
+ std::string Flags = ",\"";
+
+ if (flags & SectionFlags::Code)
+ Flags += 'x';
+ if (flags & SectionFlags::Writeable)
+ Flags += 'w';
+
+ Flags += "\"";
+
+ return Flags;
+}
+
+X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
+ X86GenericTargetAsmInfo(TM) {
+ GlobalPrefix = "_";
+ CommentString = ";";
+
+ PrivateGlobalPrefix = "$";
+ AlignDirective = "\talign\t";
+ ZeroDirective = "\tdb\t";
+ ZeroDirectiveSuffix = " dup(0)";
+ AsciiDirective = "\tdb\t";
+ AscizDirective = 0;
+ Data8bitsDirective = "\tdb\t";
+ Data16bitsDirective = "\tdw\t";
+ Data32bitsDirective = "\tdd\t";
+ Data64bitsDirective = "\tdq\t";
+ HasDotTypeDotSizeDirective = false;
+ HasSingleParameterDotFile = false;
+
+ TextSection = getUnnamedSection("_text", SectionFlags::Code);
+ DataSection = getUnnamedSection("_data", SectionFlags::Writeable);
+
+ JumpTableDataSection = NULL;
+ SwitchToSectionDirective = "";
+ TextSectionStartSuffix = "\tsegment 'CODE'";
+ DataSectionStartSuffix = "\tsegment 'DATA'";
+ SectionEndDirectiveSuffix = "\tends\n";
+}
+
+template <class BaseTAI>
+bool X86TargetAsmInfo<BaseTAI>::LowerToBSwap(CallInst *CI) const {
+ // FIXME: this should verify that we are targetting a 486 or better. If not,
+ // we will turn this bswap into something that will be lowered to logical ops
+ // instead of emitting the bswap asm. For now, we don't support 486 or lower
+ // so don't worry about this.
+
+ // Verify this is a simple bswap.
+ if (CI->getNumOperands() != 2 ||
+ CI->getType() != CI->getOperand(1)->getType() ||
+ !CI->getType()->isInteger())
+ return false;
+
+ const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
+ if (!Ty || Ty->getBitWidth() % 16 != 0)
+ return false;
+
+ // Okay, we can do this xform, do so now.
+ const Type *Tys[] = { Ty };
+ Module *M = CI->getParent()->getParent()->getParent();
+ Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
+
+ Value *Op = CI->getOperand(1);
+ Op = CallInst::Create(Int, Op, CI->getName(), CI);
+
+ CI->replaceAllUsesWith(Op);
+ CI->eraseFromParent();
+ return true;
+}
+
+template <class BaseTAI>
+bool X86TargetAsmInfo<BaseTAI>::ExpandInlineAsm(CallInst *CI) const {
+ InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
+ std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
+
+ std::string AsmStr = IA->getAsmString();
+
+ // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
+ std::vector<std::string> AsmPieces;
+ SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
+
+ switch (AsmPieces.size()) {
+ default: return false;
+ case 1:
+ AsmStr = AsmPieces[0];
+ AsmPieces.clear();
+ SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
+
+ // bswap $0
+ if (AsmPieces.size() == 2 &&
+ (AsmPieces[0] == "bswap" ||
+ AsmPieces[0] == "bswapq" ||
+ AsmPieces[0] == "bswapl") &&
+ (AsmPieces[1] == "$0" ||
+ AsmPieces[1] == "${0:q}")) {
+ // No need to check constraints, nothing other than the equivalent of
+ // "=r,0" would be valid here.
+ return LowerToBSwap(CI);
+ }
+ // rorw $$8, ${0:w} --> llvm.bswap.i16
+ if (CI->getType() == Type::Int16Ty &&
+ AsmPieces.size() == 3 &&
+ AsmPieces[0] == "rorw" &&
+ AsmPieces[1] == "$$8," &&
+ AsmPieces[2] == "${0:w}" &&
+ IA->getConstraintString() == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}") {
+ return LowerToBSwap(CI);
+ }
+ break;
+ case 3:
+ if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
+ Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
+ Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
+ // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
+ std::vector<std::string> Words;
+ SplitString(AsmPieces[0], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
+ Words.clear();
+ SplitString(AsmPieces[1], Words, " \t");
+ if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
+ Words.clear();
+ SplitString(AsmPieces[2], Words, " \t,");
+ if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
+ Words[2] == "%edx") {
+ return LowerToBSwap(CI);
+ }
+ }
+ }
+ }
+ break;
+ }
+ return false;
+}
+
+// Instantiate default implementation.
+TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);
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