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1.1 root 1: /* Output variables, constants and external declarations, for GNU compiler. 1.1.1.3 ! root 2: Copyright (C) 1988, 1994 Free Software Foundation, Inc. 1.1 root 3: 4: This file is part of GNU CC. 5: 6: GNU CC is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU CC is distributed in the hope that it will be useful, 12: but WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14: GNU General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU CC; see the file COPYING. If not, write to 18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ 19: 1.1.1.3 ! root 20: #define VMS_TARGET ! 21: 1.1 root 22: /* This enables certain macros in vax.h, which will make an indirect 23: reference to an external symbol an invalid address. This needs to be 24: defined before we include vax.h, since it determines which macros 25: are used for GO_IF_*. */ 26: 27: #define NO_EXTERNAL_INDIRECT_ADDRESS 28: 29: #include "vax/vax.h" 30: 31: #undef LIB_SPEC 32: #undef CPP_PREDEFINES 33: #undef TARGET_VERSION 34: #undef TARGET_DEFAULT 35: #undef CALL_USED_REGISTERS 36: #undef MAYBE_VMS_FUNCTION_PROLOGUE 37: #undef FUNCTION_PROLOGUE 38: #undef STARTING_FRAME_OFFSET 39: 40: /* Predefine this in CPP because VMS limits the size of command options 41: and GNU CPP is not used on VMS except with GNU C. */ 1.1.1.3 ! root 42: #define CPP_PREDEFINES \ ! 43: "-Dvax -Dvms -DVMS -D__vax__ -D__vms__ -D__VMS__\ ! 44: -D__GNUC__=2 -D__GNUC_MINOR__=6 -Asystem(vms) -Acpu(vax) -Amachine(vax)" 1.1 root 45: 46: /* These match the definitions used in VAXCRTL, the VMS C run-time library */ 47: 48: #define SIZE_TYPE "unsigned int" 49: #define PTRDIFF_TYPE "int" 50: #define WCHAR_TYPE "unsigned int" 51: 52: /* Use memcpy for structure copying, and so forth. */ 53: #define TARGET_MEM_FUNCTIONS 54: 55: /* Strictly speaking, VMS does not use DBX at all, but the interpreter built 56: into gas only speaks straight DBX. */ 57: 58: #define DEFAULT_GDB_EXTENSIONS 0 59: 60: /* By default, allow $ to be part of an identifier. */ 61: #define DOLLARS_IN_IDENTIFIERS 2 62: 63: #define TARGET_DEFAULT 1 64: #define TARGET_VERSION fprintf (stderr, " (vax vms)"); 65: 66: /* The structure return address arrives as an "argument" on VMS. */ 67: #undef STRUCT_VALUE_REGNUM 68: #define STRUCT_VALUE 0 69: #undef PCC_STATIC_STRUCT_RETURN 70: 71: #define CALL_USED_REGISTERS {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} 72: 73: /* We redefine this because there is a hidden variable on the stack 74: that VAXC$ESTABLISH uses. We just need to add four bytes to whatever 75: gcc thinks that we need. Similarly, we need to move all local variables 76: down 4 bytes in the stack. */ 77: 78: #define STARTING_FRAME_OFFSET -4 79: 80: #define FUNCTION_PROLOGUE(FILE, SIZE) \ 81: { register int regno; \ 82: register int mask = 0; \ 83: register int newsize = SIZE + 4; \ 84: extern char call_used_regs[]; \ 85: for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) \ 86: if (regs_ever_live[regno] && !call_used_regs[regno]) \ 87: mask |= 1 << regno; \ 88: fprintf (FILE, "\t.word 0x%x\n", mask); \ 89: MAYBE_VMS_FUNCTION_PROLOGUE(FILE) \ 90: if (newsize >= 64) fprintf (FILE, "\tmovab %d(sp),sp\n", -newsize);\ 91: else fprintf (FILE, "\tsubl2 $%d,sp\n", newsize); } 92: 1.1.1.2 root 93: #define __MAIN_NAME " main(" 1.1 root 94: /* 95: * The MAYBE_VMS_FUNCTION_PROLOGUE macro works for both gcc and g++. It 96: * first checks to see if the current routine is "main", which will only 97: * happen for GCC, and add the jsb if it is. If is not the case then try and 98: * see if __MAIN_NAME is part of current_function_name, which will only happen 99: * if we are running g++, and add the jsb if it is. In gcc there should never 1.1.1.2 root 100: * be a paren in the function name, and in g++ there is always a "(" in the 1.1 root 101: * function name, thus there should never be any confusion. 102: * 103: * Adjusting the stack pointer by 4 before calling C$MAIN_ARGS is required 104: * when linking with the VMS POSIX version of the C run-time library; using 105: * `subl2 $4,r0' is adequate but we use `clrl -(sp)' instead. The extra 4 106: * bytes could be removed after the call because STARTING_FRAME_OFFSET's 107: * setting of -4 will end up adding them right back again, but don't bother. 108: */ 109: #define MAYBE_VMS_FUNCTION_PROLOGUE(FILE) \ 110: { extern char *current_function_name; \ 111: char *p = current_function_name; \ 112: int is_main = strcmp ("main", p) == 0; \ 113: while (!is_main && *p != '\0') \ 114: { \ 115: if (*p == *__MAIN_NAME \ 116: && strncmp (p, __MAIN_NAME, sizeof __MAIN_NAME - sizeof "") == 0) \ 117: is_main = 1; \ 118: else \ 119: p++; \ 120: } \ 121: if (is_main) \ 122: fprintf (FILE, "\t%s\n\t%s\n", "clrl -(sp)", "jsb _C$MAIN_ARGS"); \ 123: } 124: 125: /* This macro definition sets up a default value for `main' to return. */ 126: #define DEFAULT_MAIN_RETURN c_expand_return (integer_one_node) 127: 128: /* This makes use of a hook in varasm.c to mark all external variables 129: for us. We use this to make sure that external variables are correctly 130: addressed. Under VMS there is some brain damage in the linker that requires 131: us to do this. */ 132: 133: #define ENCODE_SECTION_INFO(decl) \ 134: if (DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)) \ 135: SYMBOL_REF_FLAG (XEXP (DECL_RTL (decl), 0)) = 1; 136: 137: /* This is how to output a command to make the user-level label named NAME 138: defined for reference from other files. */ 139: 140: #undef ASM_GLOBALIZE_LABEL 141: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \ 142: do { fputs (".globl ", FILE); \ 143: assemble_name (FILE, NAME); \ 144: fputs ("\n", FILE); \ 1.1.1.3 ! root 145: vms_check_external (NULL_TREE, NAME, 0); \ 1.1 root 146: } while (0) 147: 148: /* Under VMS we write the actual size of the storage to be allocated even 149: though the symbol is external. Although it is possible to give external 150: symbols a size of 0 (as unix does), the VMS linker does not make the 151: distinction between a variable definition and an external reference of a 152: variable, and thus the linker will not complain about a missing definition. 153: If we followed the unix example of giving external symbols a size of 154: zero, you tried to link a program where a given variable was externally 155: defined but none of the object modules contained a non-extern definition, 156: the linker would allocate 0 bytes for the variable, and any attempt to 157: use that variable would use the storage allocated to some other variable. 158: 159: We must also select either const_section or data_section: this will indicate 160: whether or not the variable will get the readonly bit set. Since the 161: VMS linker does not distinguish between a variable's definition and an 162: external reference, all usages of a given variable must have the readonly 163: bit set the same way, or the linker will get confused and give warning 164: messages. */ 165: 166: /* We used to round the size up to a multiple of 4, 167: but that causes linker errors sometimes when the variable was initialized 168: since the size of its definition was not likewise rounded up. */ 169: 1.1.1.3 ! root 170: /* Note: the original ASM_OUTPUT_EXTERNAL code has been moved into ! 171: vms_check_external and vms_flush_pending_externals. */ ! 172: 1.1 root 173: #define ASM_OUTPUT_EXTERNAL(FILE,DECL,NAME) \ 1.1.1.3 ! root 174: { if (DECL_INITIAL (DECL) == 0 && TREE_CODE (DECL) != FUNCTION_DECL) \ ! 175: vms_check_external ((DECL), (NAME), 1); \ ! 176: } ! 177: ! 178: /* ASM_OUTPUT_EXTERNAL will have wait until after an initializer is ! 179: completed in order to switch sections for an external object, so ! 180: use the DECLARE_OBJECT hooks to manage deferred declarations. */ ! 181: ! 182: /* This is the default action for ASM_DECLARE_OBJECT_NAME, but if it ! 183: is explicitly defined, then ASM_FINISH_DECLARE_OBJECT will be used. */ ! 184: ! 185: #define ASM_DECLARE_OBJECT_NAME(ASM_OUT_FILE,NAME,DECL) \ ! 186: { if (output_bytecode) \ ! 187: BC_OUTPUT_LABEL ((ASM_OUT_FILE), (NAME)); \ ! 188: else \ ! 189: ASM_OUTPUT_LABEL ((ASM_OUT_FILE), (NAME)); \ 1.1 root 190: } 191: 1.1.1.3 ! root 192: /* We don't need to do anything special to finish the current object, but it ! 193: should now be safe to output any deferred external global declarations. */ ! 194: ! 195: #define ASM_FINISH_DECLARE_OBJECT(FILE,DECL,TOPLVL,ATEND) \ ! 196: vms_flush_pending_externals(FILE) ! 197: ! 198: /* Anything still pending must be flushed at the very end. */ ! 199: ! 200: #define ASM_FILE_END(STREAM) \ ! 201: vms_flush_pending_externals(STREAM) ! 202: 1.1 root 203: /* Here we redefine ASM_OUTPUT_COMMON to select the data_section or the 204: const_section before writing the ".const" assembler directive. 205: If we were specifying a size of zero for external variables, we would 206: not have to select a section, since the assembler can assume that 207: when the size > 0, the storage is for a non-external, uninitialized 208: variable (for which a "const" declaration would be senseless), 209: and the assembler can make the storage read/write. 210: 211: Since the ".const" directive specifies the actual size of the storage used 212: for both external and non-external variables, the assembler cannot 213: make this assumption, and thus it has no way of deciding if storage should 214: be read/write or read-only. To resolve this, we give the assembler some 215: assistance, in the form of a ".const" or a ".data" directive. 216: 217: Under GCC 1.40, external variables were declared with a size of zero. 218: The GNU assembler, GAS, will recognize the "-2" switch when built for VMS; 219: when compiling programs with GCC 2.n this switch should be used or the 220: assembler will not give the read-only attribute to external constants. 221: Failure to use this switch will result in linker warning messages about 222: mismatched psect attributes. */ 223: 224: #undef ASM_OUTPUT_COMMON 225: 226: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 227: ( ((TREE_READONLY (decl) && ! TREE_THIS_VOLATILE (decl)) \ 228: ? (const_section (), 0) : (data_section (), 0)), \ 229: fputs (".comm ", (FILE)), \ 230: assemble_name ((FILE), (NAME)), \ 231: fprintf ((FILE), ",%u\n", (SIZE))) 232: 233: /* We define this to prevent the name mangler from putting dollar signs into 234: function names. This isn't really needed, but it has been here for 235: some time and removing it would cause the object files generated by the 236: compiler to be incompatible with the object files from a compiler that 237: had this defined. Since it does no harm, we leave it in. */ 238: 239: #define NO_DOLLAR_IN_LABEL 240: 241: /* Add a "const" section. This is viewed by the assembler as being nearly 242: the same as the "data" section, with the only difference being that a 243: flag is set for variables declared while in the const section. This 244: flag is used to determine whether or not the read/write bit should be 245: set in the Psect definition. */ 246: 247: #define EXTRA_SECTIONS in_const 248: 249: #define EXTRA_SECTION_FUNCTIONS \ 250: void \ 251: const_section () \ 252: { \ 253: if (in_section != in_const) { \ 254: fprintf(asm_out_file,".const\n"); \ 255: in_section = in_const; \ 256: } \ 257: } 258: 259: /* This macro contains the logic to decide which section a variable 260: should be stored in. Static constant variables go in the text_section, 261: non-const variables go in the data_section, and non-static const 262: variables go in the const_section. 263: 264: Since this macro is used in a number of places, we must also be able 265: to decide where to place string constants. */ 266: 267: #define SELECT_SECTION(T,RELOC) \ 268: { \ 269: if (TREE_CODE (T) == VAR_DECL) \ 270: { \ 1.1.1.3 ! root 271: if (TREE_READONLY (T) && ! TREE_THIS_VOLATILE (T) \ ! 272: && DECL_INITIAL (T) \ ! 273: && (DECL_INITIAL (T) == error_mark_node \ ! 274: || TREE_CONSTANT (DECL_INITIAL (T)))) \ 1.1 root 275: { \ 276: if (TREE_PUBLIC (T)) \ 277: const_section (); \ 278: else \ 279: text_section (); \ 280: } \ 281: else \ 282: data_section (); \ 283: } \ 284: if (*tree_code_type[(int) TREE_CODE (T)] == 'c') \ 285: { \ 286: if ((TREE_CODE (T) == STRING_CST && flag_writable_strings)) \ 287: data_section (); \ 288: else \ 289: text_section (); \ 290: } \ 291: } 292: 293: /* This is used by a hook in varasm.c to write the assembler directives 294: that are needed to tell the startup code which constructors need to 295: be run. */ 296: 297: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ 298: { \ 299: fprintf ((FILE),".globl $$PsectAttributes_NOOVR$$__gxx_init_1\n"); \ 300: data_section(); \ 301: fprintf ((FILE),"$$PsectAttributes_NOOVR$$__gxx_init_1:\n\t.long\t"); \ 302: assemble_name ((FILE), (NAME)); \ 303: fputc ('\n', (FILE)); \ 304: } 305: 306: /* This is used by a hook in varasm.c to write the assembler directives 307: that are needed to tell the startup code which destructors need to 308: be run. */ 309: 310: #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \ 311: { \ 312: fprintf ((FILE),".globl $$PsectAttributes_NOOVR$$__gxx_clean_1\n"); \ 313: data_section(); \ 314: fprintf ((FILE),"$$PsectAttributes_NOOVR$$__gxx_clean_1:\n\t.long\t");\ 315: assemble_name ((FILE), (NAME)); \ 316: fputc ('\n', (FILE)); \ 317: } 318: 319: /* The following definitions are used in libgcc2.c with the __main 320: function. The _SHR symbol is used when the sharable image library 321: for libg++ is used - this is picked up automatically by the linker 322: and this symbol points to the start of the __CTOR_LIST__ from libg++. 323: If libg++ is not being used, then __CTOR_LIST_SHR__ occurs just after 324: __CTOR_LIST__, and essentially points to the same list as __CTOR_LIST. */ 325: 326: #ifdef L__main 327: 328: #define __CTOR_LIST__ __gxx_init_0 329: #define __CTOR_LIST_END__ __gxx_init_2 330: 331: #define __CTOR_LIST_SHR__ $$PsectAttributes_NOSHR$$__gxx_init_0_shr 332: #define __CTOR_LIST_SHR_END__ $$PsectAttributes_NOSHR$$__gxx_init_2_shr 333: 334: #define DO_GLOBAL_CTORS_BODY \ 335: do { \ 336: func_ptr *p; \ 337: extern func_ptr __CTOR_LIST__[1]; \ 338: extern func_ptr __CTOR_LIST_END__[1]; \ 339: extern func_ptr __CTOR_LIST_SHR__[1]; \ 340: extern func_ptr __CTOR_LIST_SHR_END__[1]; \ 341: if( &__CTOR_LIST_SHR__[0] != &__CTOR_LIST__[1]) \ 342: for (p = __CTOR_LIST_SHR__ + 1; p < __CTOR_LIST_SHR_END__ ; p++ ) \ 343: if (*p) (*p) (); \ 344: for (p = __CTOR_LIST__ + 1; p < __CTOR_LIST_END__ ; p++ ) \ 345: if (*p) (*p) (); \ 346: atexit (__do_global_dtors); \ 347: { \ 348: __label__ foo; \ 349: int *callers_caller_fp = (int *) __builtin_frame_address (3); \ 350: register int retval asm ("r0"); \ 351: callers_caller_fp[4] = (int) && foo; \ 352: return; \ 353: foo: \ 354: exit (retval); \ 355: } \ 356: } while (0) 357: 358: #define __DTOR_LIST__ __gxx_clean_0 359: #define __DTOR_LIST_END__ __gxx_clean_2 360: 361: #define __DTOR_LIST_SHR__ $$PsectAttributes_NOSHR$$__gxx_clean_0_shr 362: #define __DTOR_LIST_SHR_END__ $$PsectAttributes_NOSHR$$__gxx_clean_2_shr 363: 364: #define DO_GLOBAL_DTORS_BODY \ 365: do { \ 366: func_ptr *p; \ 367: extern func_ptr __DTOR_LIST__[1]; \ 368: extern func_ptr __DTOR_LIST_END__[1]; \ 369: extern func_ptr __DTOR_LIST_SHR__[1]; \ 370: extern func_ptr __DTOR_LIST_SHR_END__[1]; \ 371: for (p = __DTOR_LIST__ + 1; p < __DTOR_LIST_END__ ; p++ ) \ 372: if (*p) (*p) (); \ 373: if( &__DTOR_LIST_SHR__[0] != &__DTOR_LIST__[1]) \ 374: for (p = __DTOR_LIST_SHR__ + 1; p < __DTOR_LIST_SHR_END__ ; p++ ) \ 375: if (*p) (*p) (); \ 376: } while (0) 377: 378: #endif /* L__main */
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