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