lib/Target/TargetAsmInfo.cpp

   1 //===-- TargetAsmInfo.cpp - Asm Info ---------------------------------------==//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines target asm properties related what form asm statements
  11 // should take.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Target/TargetAsmInfo.h"
  16 #include "llvm/Support/Dwarf.h"
  17 #include <cctype>
  18 #include <cstring>
  19
  20 using namespace llvm;
  21
  22 TargetAsmInfo::TargetAsmInfo() :
  23   TextSection("\t.text"),
  24   DataSection("\t.data"),
  25   BSSSection("\t.bss"),
  26   TLSDataSection("\t.section .tdata,\"awT\",@progbits"),
  27   TLSBSSSection("\t.section .tbss,\"awT\",@nobits"),
  28   ZeroFillDirective(0),
  29   NeedsSet(false),
  30   MaxInstLength(4),
  31   PCSymbol("$"),
  32   SeparatorChar(';'),
  33   CommentString("#"),
  34   GlobalPrefix(""),
  35   PrivateGlobalPrefix("."),
  36   JumpTableSpecialLabelPrefix(0),
  37   GlobalVarAddrPrefix(""),
  38   GlobalVarAddrSuffix(""),
  39   FunctionAddrPrefix(""),
  40   FunctionAddrSuffix(""),
  41   PersonalityPrefix(""),
  42   PersonalitySuffix(""),
  43   NeedsIndirectEncoding(false),
  44   InlineAsmStart("#APP"),
  45   InlineAsmEnd("#NO_APP"),
  46   AssemblerDialect(0),
  47   ZeroDirective("\t.zero\t"),
  48   ZeroDirectiveSuffix(0),
  49   AsciiDirective("\t.ascii\t"),
  50   AscizDirective("\t.asciz\t"),
  51   Data8bitsDirective("\t.byte\t"),
  52   Data16bitsDirective("\t.short\t"),
  53   Data32bitsDirective("\t.long\t"),
  54   Data64bitsDirective("\t.quad\t"),
  55   AlignDirective("\t.align\t"),
  56   AlignmentIsInBytes(true),
  57   SwitchToSectionDirective("\t.section\t"),
  58   TextSectionStartSuffix(""),
  59   DataSectionStartSuffix(""),
  60   SectionEndDirectiveSuffix(0),
  61   ConstantPoolSection("\t.section .rodata"),
  62   JumpTableDataSection("\t.section .rodata"),
  63   JumpTableDirective(0),
  64   CStringSection(0),
  65   StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
  66   StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
  67   FourByteConstantSection(0),
  68   EightByteConstantSection(0),
  69   SixteenByteConstantSection(0),
  70   ReadOnlySection(0),
  71   GlobalDirective("\t.globl\t"),
  72   SetDirective(0),
  73   LCOMMDirective(0),
  74   COMMDirective("\t.comm\t"),
  75   COMMDirectiveTakesAlignment(true),
  76   HasDotTypeDotSizeDirective(true),
  77   UsedDirective(0),
  78   WeakRefDirective(0),
  79   WeakDefDirective(0),
  80   HiddenDirective("\t.hidden\t"),
  81   ProtectedDirective("\t.protected\t"),
  82   AbsoluteDebugSectionOffsets(false),
  83   AbsoluteEHSectionOffsets(false),
  84   HasLEB128(false),
  85   HasDotLocAndDotFile(false),
  86   SupportsDebugInformation(false),
  87   SupportsExceptionHandling(false),
  88   DwarfRequiresFrameSection(true),
  89   GlobalEHDirective(0),
  90   SupportsWeakOmittedEHFrame(true),
  91   ShortenEHDataOn64Bit(false),
  92   DwarfSectionOffsetDirective(0),
  93   DwarfAbbrevSection(".debug_abbrev"),
  94   DwarfInfoSection(".debug_info"),
  95   DwarfLineSection(".debug_line"),
  96   DwarfFrameSection(".debug_frame"),
  97   DwarfPubNamesSection(".debug_pubnames"),
  98   DwarfPubTypesSection(".debug_pubtypes"),
  99   DwarfStrSection(".debug_str"),
 100   DwarfLocSection(".debug_loc"),
 101   DwarfARangesSection(".debug_aranges"),
 102   DwarfRangesSection(".debug_ranges"),
 103   DwarfMacInfoSection(".debug_macinfo"),
 104   DwarfEHFrameSection(".eh_frame"),
 105   DwarfExceptionSection(".gcc_except_table"),
 106   AsmTransCBE(0) {
 107 }
 108
 109 TargetAsmInfo::~TargetAsmInfo() {
 110 }
 111
 112 /// Measure the specified inline asm to determine an approximation of its
 113 /// length.
 114 /// Comments (which run till the next SeparatorChar or newline) do not
 115 /// count as an instruction.
 116 /// Any other non-whitespace text is considered an instruction, with
 117 /// multiple instructions separated by SeparatorChar or newlines.
 118 /// Variable-length instructions are not handled here; this function
 119 /// may be overloaded in the target code to do that.
 120 unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
 121   // Count the number of instructions in the asm.
 122   bool atInsnStart = true;
 123   unsigned Length = 0;
 124   for (; *Str; ++Str) {
 125     if (*Str == '\n' || *Str == SeparatorChar)
 126       atInsnStart = true;
 127     if (atInsnStart && !isspace(*Str)) {
 128       Length += MaxInstLength;
 129       atInsnStart = false;
 130     }
 131     if (atInsnStart && strncmp(Str, CommentString, strlen(CommentString))==0)
 132       atInsnStart = false;
 133   }
 134
 135   return Length;
 136 }
 137
 138 unsigned TargetAsmInfo::PreferredEHDataFormat(unsigned Reason,
 139                                               bool Global) const {
 140   return dwarf::DW_EH_PE_absptr;
 141 }
 142