lib/Target/TargetAsmInfo.cpp

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