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
  17 using namespace llvm;
  18
  19 TargetAsmInfo::TargetAsmInfo() :
  20   TextSection(".text"),
  21   DataSection(".data"),
  22   BSSSection(".bss"),
  23   ZeroFillDirective(0),
  24   AddressSize(4),
  25   NeedsSet(false),
  26   MaxInstLength(4),
  27   PCSymbol("$"),
  28   SeparatorChar(';'),
  29   CommentString("#"),
  30   GlobalPrefix(""),
  31   PrivateGlobalPrefix("."),
  32   JumpTableSpecialLabelPrefix(0),
  33   GlobalVarAddrPrefix(""),
  34   GlobalVarAddrSuffix(""),
  35   FunctionAddrPrefix(""),
  36   FunctionAddrSuffix(""),
  37   InlineAsmStart("#APP"),
  38   InlineAsmEnd("#NO_APP"),
  39   AssemblerDialect(0),
  40   ZeroDirective("\t.zero\t"),
  41   ZeroDirectiveSuffix(0),
  42   AsciiDirective("\t.ascii\t"),
  43   AscizDirective("\t.asciz\t"),
  44   Data8bitsDirective("\t.byte\t"),
  45   Data16bitsDirective("\t.short\t"),
  46   Data32bitsDirective("\t.long\t"),
  47   Data64bitsDirective("\t.quad\t"),
  48   AlignDirective("\t.align\t"),
  49   AlignmentIsInBytes(true),
  50   SwitchToSectionDirective("\t.section\t"),
  51   TextSectionStartSuffix(""),
  52   DataSectionStartSuffix(""),
  53   SectionEndDirectiveSuffix(0),
  54   ConstantPoolSection("\t.section .rodata\n"),
  55   JumpTableDataSection("\t.section .rodata\n"),
  56   JumpTableDirective(0),
  57   CStringSection(0),
  58   StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
  59   StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
  60   FourByteConstantSection(0),
  61   EightByteConstantSection(0),
  62   SixteenByteConstantSection(0),
  63   GlobalDirective(0),
  64   SetDirective(0),
  65   LCOMMDirective(0),
  66   COMMDirective("\t.comm\t"),
  67   COMMDirectiveTakesAlignment(true),
  68   HasDotTypeDotSizeDirective(true),
  69   UsedDirective(0),
  70   WeakRefDirective(0),
  71   HiddenDirective("\t.hidden\t"),
  72   AbsoluteSectionOffsets(false),
  73   HasLEB128(false),
  74   HasDotLoc(false),
  75   HasDotFile(false),
  76   SupportsExceptionHandling(false),
  77   DwarfRequiresFrameSection(true),
  78   DwarfSectionOffsetDirective(0),
  79   DwarfAbbrevSection(".debug_abbrev"),
  80   DwarfInfoSection(".debug_info"),
  81   DwarfLineSection(".debug_line"),
  82   DwarfFrameSection(".debug_frame"),
  83   DwarfPubNamesSection(".debug_pubnames"),
  84   DwarfPubTypesSection(".debug_pubtypes"),
  85   DwarfStrSection(".debug_str"),
  86   DwarfLocSection(".debug_loc"),
  87   DwarfARangesSection(".debug_aranges"),
  88   DwarfRangesSection(".debug_ranges"),
  89   DwarfMacInfoSection(".debug_macinfo"),
  90   DwarfEHFrameSection(".eh_frame"),
  91   DwarfExceptionSection(".gcc_except_table"),
  92   AsmTransCBE(0) {
  93 }
  94
  95 TargetAsmInfo::~TargetAsmInfo() {
  96 }
  97
  98 /// Measure the specified inline asm to determine an approximation of its
  99 /// length.
 100 unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
 101   // Count the number of instructions in the asm.
 102   unsigned NumInsts = 0;
 103   for (; *Str; ++Str) {
 104     if (*Str == '\n' || *Str == SeparatorChar)
 105       ++NumInsts;
 106   }
 107
 108   // Multiply by the worst-case length for each instruction.
 109   return NumInsts * MaxInstLength;
 110 }
 111