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(".text"),
  23   DataSection(".data"),
  24   BSSSection(".bss"),
  25   TLSDataSection("\t.section .tdata,\"awT\",@progbits"),
  26   TLSBSSSection("\t.section .tbss,\"awT\",@nobits"),
  27   ZeroFillDirective(0),
  28   AddressSize(4),
  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   InlineAsmStart("#APP"),
  42   InlineAsmEnd("#NO_APP"),
  43   AssemblerDialect(0),
  44   ZeroDirective("\t.zero\t"),
  45   ZeroDirectiveSuffix(0),
  46   AsciiDirective("\t.ascii\t"),
  47   AscizDirective("\t.asciz\t"),
  48   Data8bitsDirective("\t.byte\t"),
  49   Data16bitsDirective("\t.short\t"),
  50   Data32bitsDirective("\t.long\t"),
  51   Data64bitsDirective("\t.quad\t"),
  52   AlignDirective("\t.align\t"),
  53   AlignmentIsInBytes(true),
  54   SwitchToSectionDirective("\t.section\t"),
  55   TextSectionStartSuffix(""),
  56   DataSectionStartSuffix(""),
  57   SectionEndDirectiveSuffix(0),
  58   ConstantPoolSection("\t.section .rodata\n"),
  59   JumpTableDataSection("\t.section .rodata\n"),
  60   JumpTableDirective(0),
  61   CStringSection(0),
  62   StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
  63   StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
  64   FourByteConstantSection(0),
  65   EightByteConstantSection(0),
  66   SixteenByteConstantSection(0),
  67   ReadOnlySection(0),
  68   GlobalDirective(0),
  69   SetDirective(0),
  70   LCOMMDirective(0),
  71   COMMDirective("\t.comm\t"),
  72   COMMDirectiveTakesAlignment(true),
  73   HasDotTypeDotSizeDirective(true),
  74   UsedDirective(0),
  75   WeakRefDirective(0),
  76   HiddenDirective("\t.hidden\t"),
  77   AbsoluteSectionOffsets(false),
  78   HasLEB128(false),
  79   HasDotLoc(false),
  80   HasDotFile(false),
  81   SupportsExceptionHandling(false),
  82   DwarfRequiresFrameSection(true),
  83   DwarfSectionOffsetDirective(0),
  84   DwarfAbbrevSection(".debug_abbrev"),
  85   DwarfInfoSection(".debug_info"),
  86   DwarfLineSection(".debug_line"),
  87   DwarfFrameSection(".debug_frame"),
  88   DwarfPubNamesSection(".debug_pubnames"),
  89   DwarfPubTypesSection(".debug_pubtypes"),
  90   DwarfStrSection(".debug_str"),
  91   DwarfLocSection(".debug_loc"),
  92   DwarfARangesSection(".debug_aranges"),
  93   DwarfRangesSection(".debug_ranges"),
  94   DwarfMacInfoSection(".debug_macinfo"),
  95   DwarfEHFrameSection(".eh_frame"),
  96   DwarfExceptionSection(".gcc_except_table"),
  97   AsmTransCBE(0) {
  98 }
  99
 100 TargetAsmInfo::~TargetAsmInfo() {
 101 }
 102
 103 /// Measure the specified inline asm to determine an approximation of its
 104 /// length.
 105 /// Comments (which run till the next SeparatorChar or newline) do not
 106 /// count as an instruction.
 107 /// Any other non-whitespace text is considered an instruction, with
 108 /// multiple instructions separated by SeparatorChar or newlines.
 109 /// Variable-length instructions are not handled here; this function
 110 /// may be overloaded in the target code to do that.
 111 unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
 112   // Count the number of instructions in the asm.
 113   bool atInsnStart = true;
 114   unsigned Length = 0;
 115   for (; *Str; ++Str) {
 116     if (*Str == '\n' || *Str == SeparatorChar)
 117       atInsnStart = true;
 118     if (atInsnStart && !isspace(*Str)) {
 119       Length += MaxInstLength;
 120       atInsnStart = false;
 121     }
 122     if (atInsnStart && strncmp(Str, CommentString, strlen(CommentString))==0)
 123       atInsnStart = false;
 124   }
 125
 126   return Length;
 127 }
 128