lib/Target/ARM/ARMTargetAsmInfo.cpp

   1 //===-- ARMTargetAsmInfo.cpp - ARM asm properties ---------------*- C++ -*-===//
   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 contains the declarations of the ARMTargetAsmInfo properties.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ARMTargetAsmInfo.h"
  15 #include "ARMTargetMachine.h"
  16 #include <cstring>
  17 #include <cctype>
  18 using namespace llvm;
  19
  20
  21 const char *const llvm::arm_asm_table[] = {
  22                                       "{r0}", "r0",
  23                                       "{r1}", "r1",
  24                                       "{r2}", "r2",
  25                                       "{r3}", "r3",
  26                                       "{r4}", "r4",
  27                                       "{r5}", "r5",
  28                                       "{r6}", "r6",
  29                                       "{r7}", "r7",
  30                                       "{r8}", "r8",
  31                                       "{r9}", "r9",
  32                                       "{r10}", "r10",
  33                                       "{r11}", "r11",
  34                                       "{r12}", "r12",
  35                                       "{r13}", "r13",
  36                                       "{r14}", "r14",
  37                                       "{lr}", "lr",
  38                                       "{sp}", "sp",
  39                                       "{ip}", "ip",
  40                                       "{fp}", "fp",
  41                                       "{sl}", "sl",
  42                                       "{memory}", "memory",
  43                                       "{cc}", "cc",
  44                                       0,0};
  45
  46 ARMDarwinTargetAsmInfo::ARMDarwinTargetAsmInfo(const ARMTargetMachine &TM):
  47   ARMTargetAsmInfo<DarwinTargetAsmInfo>(TM) {
  48   Subtarget = &TM.getSubtarget<ARMSubtarget>();
  49
  50   GlobalPrefix = "_";
  51   PrivateGlobalPrefix = "L";
  52   LessPrivateGlobalPrefix = "l";
  53   StringConstantPrefix = "\1LC";
  54   BSSSection = 0;                       // no BSS section
  55   ZeroDirective = "\t.space\t";
  56   ZeroFillDirective = "\t.zerofill\t";  // Uses .zerofill
  57   SetDirective = "\t.set\t";
  58   WeakRefDirective = "\t.weak_reference\t";
  59   WeakDefDirective = "\t.weak_definition ";
  60   HiddenDirective = "\t.private_extern\t";
  61   ProtectedDirective = NULL;
  62   JumpTableDataSection = ".const";
  63   CStringSection = "\t.cstring";
  64   HasDotTypeDotSizeDirective = false;
  65   HasSingleParameterDotFile = false;
  66   NeedsIndirectEncoding = true;
  67   if (TM.getRelocationModel() == Reloc::Static) {
  68     StaticCtorsSection = ".constructor";
  69     StaticDtorsSection = ".destructor";
  70   } else {
  71     StaticCtorsSection = ".mod_init_func";
  72     StaticDtorsSection = ".mod_term_func";
  73   }
  74
  75   // In non-PIC modes, emit a special label before jump tables so that the
  76   // linker can perform more accurate dead code stripping.
  77   if (TM.getRelocationModel() != Reloc::PIC_) {
  78     // Emit a local label that is preserved until the linker runs.
  79     JumpTableSpecialLabelPrefix = "l";
  80   }
  81
  82   NeedsSet = true;
  83   DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
  84   DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
  85   DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
  86   DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
  87   DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
  88   DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
  89   DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
  90   DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
  91   DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
  92   DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
  93   DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
  94 }
  95
  96 ARMELFTargetAsmInfo::ARMELFTargetAsmInfo(const ARMTargetMachine &TM):
  97   ARMTargetAsmInfo<ELFTargetAsmInfo>(TM) {
  98   Subtarget = &TM.getSubtarget<ARMSubtarget>();
  99
 100   NeedsSet = false;
 101   HasLEB128 = true;
 102   AbsoluteDebugSectionOffsets = true;
 103   CStringSection = ".rodata.str";
 104   PrivateGlobalPrefix = ".L";
 105   WeakRefDirective = "\t.weak\t";
 106   SetDirective = "\t.set\t";
 107   DwarfRequiresFrameSection = false;
 108   DwarfAbbrevSection =  "\t.section\t.debug_abbrev,\"\",%progbits";
 109   DwarfInfoSection =    "\t.section\t.debug_info,\"\",%progbits";
 110   DwarfLineSection =    "\t.section\t.debug_line,\"\",%progbits";
 111   DwarfFrameSection =   "\t.section\t.debug_frame,\"\",%progbits";
 112   DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",%progbits";
 113   DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",%progbits";
 114   DwarfStrSection =     "\t.section\t.debug_str,\"\",%progbits";
 115   DwarfLocSection =     "\t.section\t.debug_loc,\"\",%progbits";
 116   DwarfARangesSection = "\t.section\t.debug_aranges,\"\",%progbits";
 117   DwarfRangesSection =  "\t.section\t.debug_ranges,\"\",%progbits";
 118   DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",%progbits";
 119
 120   if (Subtarget->isAAPCS_ABI()) {
 121     StaticCtorsSection = "\t.section .init_array,\"aw\",%init_array";
 122     StaticDtorsSection = "\t.section .fini_array,\"aw\",%fini_array";
 123   } else {
 124     StaticCtorsSection = "\t.section .ctors,\"aw\",%progbits";
 125     StaticDtorsSection = "\t.section .dtors,\"aw\",%progbits";
 126   }
 127 }
 128
 129 /// Count the number of comma-separated arguments.
 130 /// Do not try to detect errors.
 131 template <class BaseTAI>
 132 unsigned ARMTargetAsmInfo<BaseTAI>::countArguments(const char* p) const {
 133   unsigned count = 0;
 134   while (*p && isspace(*p) && *p != '\n')
 135     p++;
 136   count++;
 137   while (*p && *p!='\n' &&
 138          strncmp(p, BaseTAI::CommentString,
 139                  strlen(BaseTAI::CommentString))!=0) {
 140     if (*p==',')
 141       count++;
 142     p++;
 143   }
 144   return count;
 145 }
 146
 147 /// Count the length of a string enclosed in quote characters.
 148 /// Do not try to detect errors.
 149 template <class BaseTAI>
 150 unsigned ARMTargetAsmInfo<BaseTAI>::countString(const char* p) const {
 151   unsigned count = 0;
 152   while (*p && isspace(*p) && *p!='\n')
 153     p++;
 154   if (!*p || *p != '\"')
 155     return count;
 156   while (*++p && *p != '\"')
 157     count++;
 158   return count;
 159 }
 160
 161 /// ARM-specific version of TargetAsmInfo::getInlineAsmLength.
 162 template <class BaseTAI>
 163 unsigned ARMTargetAsmInfo<BaseTAI>::getInlineAsmLength(const char *s) const {
 164   // Make a lowercase-folded version of s for counting purposes.
 165   char *q, *s_copy = (char *)malloc(strlen(s) + 1);
 166   strcpy(s_copy, s);
 167   for (q=s_copy; *q; q++)
 168     *q = tolower(*q);
 169   const char *Str = s_copy;
 170
 171   // Count the number of bytes in the asm.
 172   bool atInsnStart = true;
 173   bool inTextSection = true;
 174   unsigned Length = 0;
 175   for (; *Str; ++Str) {
 176     if (atInsnStart) {
 177       // Skip whitespace
 178       while (*Str && isspace(*Str) && *Str != '\n')
 179         Str++;
 180       // Skip label
 181       for (const char* p = Str; *p && !isspace(*p); p++)
 182         if (*p == ':') {
 183           Str = p+1;
 184           while (*Str && isspace(*Str) && *Str != '\n')
 185             Str++;
 186           break;
 187         }
 188
 189       if (*Str == 0) break;
 190
 191       // Ignore everything from comment char(s) to EOL
 192       if (strncmp(Str, BaseTAI::CommentString,
 193                   strlen(BaseTAI::CommentString)) == 0)
 194         atInsnStart = false;
 195       // FIXME do something like the following for non-Darwin
 196       else if (*Str == '.' && Subtarget->isTargetDarwin()) {
 197         // Directive.
 198         atInsnStart = false;
 199
 200         // Some change the section, but don't generate code.
 201         if (strncmp(Str, ".literal4", strlen(".literal4"))==0 ||
 202             strncmp(Str, ".literal8", strlen(".literal8"))==0 ||
 203             strncmp(Str, ".const", strlen(".const"))==0 ||
 204             strncmp(Str, ".constructor", strlen(".constructor"))==0 ||
 205             strncmp(Str, ".cstring", strlen(".cstring"))==0 ||
 206             strncmp(Str, ".data", strlen(".data"))==0 ||
 207             strncmp(Str, ".destructor", strlen(".destructor"))==0 ||
 208             strncmp(Str, ".fvmlib_init0", strlen(".fvmlib_init0"))==0 ||
 209             strncmp(Str, ".fvmlib_init1", strlen(".fvmlib_init1"))==0 ||
 210             strncmp(Str, ".mod_init_func", strlen(".mod_init_func"))==0 ||
 211             strncmp(Str, ".mod_term_func", strlen(".mod_term_func"))==0 ||
 212             strncmp(Str, ".picsymbol_stub", strlen(".picsymbol_stub"))==0 ||
 213             strncmp(Str, ".symbol_stub", strlen(".symbol_stub"))==0 ||
 214             strncmp(Str, ".static_data", strlen(".static_data"))==0 ||
 215             strncmp(Str, ".section", strlen(".section"))==0 ||
 216             strncmp(Str, ".lazy_symbol_pointer", strlen(".lazy_symbol_pointer"))==0 ||
 217             strncmp(Str, ".non_lazy_symbol_pointer", strlen(".non_lazy_symbol_pointer"))==0 ||
 218             strncmp(Str, ".dyld", strlen(".dyld"))==0 ||
 219             strncmp(Str, ".const_data", strlen(".const_data"))==0 ||
 220             strncmp(Str, ".objc", strlen(".objc"))==0 ||       //// many directives
 221             strncmp(Str, ".static_const", strlen(".static_const"))==0)
 222           inTextSection=false;
 223         else if (strncmp(Str, ".text", strlen(".text"))==0)
 224           inTextSection = true;
 225         // Some can't really be handled without implementing significant pieces
 226         // of an assembler.  Others require dynamic adjustment of block sizes in
 227         // AdjustBBOffsetsAfter; it's a big compile-time speed hit to check every
 228         // instruction in there, and none of these are currently used in the kernel.
 229         else if (strncmp(Str, ".macro", strlen(".macro"))==0 ||
 230                  strncmp(Str, ".if", strlen(".if"))==0 ||
 231                  strncmp(Str, ".align", strlen(".align"))==0 ||
 232                  strncmp(Str, ".fill", strlen(".fill"))==0 ||
 233                  strncmp(Str, ".space", strlen(".space"))==0 ||
 234                  strncmp(Str, ".zerofill", strlen(".zerofill"))==0 ||
 235                  strncmp(Str, ".p2align", strlen(".p2align"))==0 ||
 236                  strncmp(Str, ".p2alignw", strlen(".p2alignw"))==0 ||
 237                  strncmp(Str, ".p2alignl", strlen(".p2alignl"))==0 ||
 238                  strncmp(Str, ".align32", strlen(".p2align32"))==0 ||
 239                  strncmp(Str, ".include", strlen(".include"))==0)
 240           cerr << "Directive " << Str << " in asm may lead to invalid offsets for" <<
 241                    " constant pools (the assembler will tell you if this happens).\n";
 242         // Some generate code, but this is only interesting in the text section.
 243         else if (inTextSection) {
 244           if (strncmp(Str, ".long", strlen(".long"))==0)
 245             Length += 4*countArguments(Str+strlen(".long"));
 246           else if (strncmp(Str, ".short", strlen(".short"))==0)
 247             Length += 2*countArguments(Str+strlen(".short"));
 248           else if (strncmp(Str, ".byte", strlen(".byte"))==0)
 249             Length += 1*countArguments(Str+strlen(".byte"));
 250           else if (strncmp(Str, ".single", strlen(".single"))==0)
 251             Length += 4*countArguments(Str+strlen(".single"));
 252           else if (strncmp(Str, ".double", strlen(".double"))==0)
 253             Length += 8*countArguments(Str+strlen(".double"));
 254           else if (strncmp(Str, ".quad", strlen(".quad"))==0)
 255             Length += 16*countArguments(Str+strlen(".quad"));
 256           else if (strncmp(Str, ".ascii", strlen(".ascii"))==0)
 257             Length += countString(Str+strlen(".ascii"));
 258           else if (strncmp(Str, ".asciz", strlen(".asciz"))==0)
 259             Length += countString(Str+strlen(".asciz"))+1;
 260         }
 261       } else if (inTextSection) {
 262         // An instruction
 263         atInsnStart = false;
 264         if (Subtarget->isThumb()) {
 265           // BL and BLX <non-reg> are 4 bytes, all others 2.
 266           if (strncmp(Str, "blx", strlen("blx"))==0) {
 267             const char* p = Str+3;
 268             while (*p && isspace(*p))
 269               p++;
 270             if (*p == 'r' || *p=='R')
 271               Length += 2;    // BLX reg
 272             else
 273               Length += 4;    // BLX non-reg
 274           } else if (strncmp(Str, "bl", strlen("bl"))==0)
 275             Length += 4;    // BL
 276           else
 277             Length += 2;    // Thumb anything else
 278         }
 279         else
 280           Length += 4;    // ARM
 281       }
 282     }
 283     if (*Str == '\n' || *Str == BaseTAI::SeparatorChar)
 284       atInsnStart = true;
 285   }
 286   free(s_copy);
 287   return Length;
 288 }
 289
 290 // Instantiate default implementation.
 291 TEMPLATE_INSTANTIATION(class ARMTargetAsmInfo<TargetAsmInfo>);