/* Output variables, constants and external declarations, for GNU compiler. Copyright (C) 1988, 1994, 1995, 1996, 1997, 1999, 2001, 2002 Free Software Foundation, Inc. This file is part of GNU CC. GNU CC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU CC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define TARGET_EXECUTABLE_SUFFIX ".exe" #define TARGET_OBJECT_SUFFIX ".obj" /* This enables certain macros in vax.h, which will make an indirect reference to an external symbol an invalid address. This needs to be defined before we include vax.h, since it determines which macros are used for GO_IF_*. */ #define NO_EXTERNAL_INDIRECT_ADDRESS #include "vax/vax.h" #undef VMS_TARGET #define VMS_TARGET 1 #undef LIB_SPEC #undef TARGET_NAME #undef TARGET_DEFAULT #undef CALL_USED_REGISTERS #undef STARTING_FRAME_OFFSET #define TARGET_OS_CPP_BUILTINS() \ do \ { \ builtin_define_std ("vms"); \ builtin_define_std ("VMS"); \ builtin_assert ("system=vms"); \ \ builtin_define_std ("vax"); \ if (TARGET_G_FLOAT) \ builtin_define_std ("GFLOAT"); \ } \ while (0) /* These match the definitions used in VAXCRTL, the VMS C run-time library */ #define SIZE_TYPE "unsigned int" #define PTRDIFF_TYPE "int" #define WCHAR_TYPE "unsigned int" #define WCHAR_TYPE_SIZE 32 /* in bits */ /* Use memcpy for structure copying, and so forth. */ #define TARGET_MEM_FUNCTIONS /* Strictly speaking, VMS does not use DBX at all, but the interpreter built into gas only speaks straight DBX. */ #define DEFAULT_GDB_EXTENSIONS 0 #define TARGET_DEFAULT 1 #define TARGET_NAME "vax/vms" /* The structure return address arrives as an "argument" on VMS. */ #undef STRUCT_VALUE_REGNUM #define STRUCT_VALUE 0 #undef PCC_STATIC_STRUCT_RETURN #define CALL_USED_REGISTERS {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1} /* The run-time library routine VAXC$ESTABLISH (necessary when mixing VMS exception handling and setjmp/longjmp in the same program) requires that a hidden automatic variable at the top of the stack be reserved for its use. We accomplish this by simply adding 4 bytes to the local stack for all functions, and making sure that normal local variables are 4 bytes lower on the stack then they would otherwise have been. */ #define STARTING_FRAME_OFFSET -4 /* This macro definition sets up a default value for `main' to return. */ #define DEFAULT_MAIN_RETURN c_expand_return (integer_one_node) /* Globalizing directive for a label. */ #define GLOBAL_ASM_OP ".globl " /* Under VMS we write the actual size of the storage to be allocated even though the symbol is external. Although it is possible to give external symbols a size of 0 (as unix does), the VMS linker does not make the distinction between a variable definition and an external reference of a variable, and thus the linker will not complain about a missing definition. If we followed the unix example of giving external symbols a size of zero, you tried to link a program where a given variable was externally defined but none of the object modules contained a non-extern definition, the linker would allocate 0 bytes for the variable, and any attempt to use that variable would use the storage allocated to some other variable. We must also select either const_section or data_section: this will indicate whether or not the variable will get the readonly bit set. Since the VMS linker does not distinguish between a variable's definition and an external reference, all usages of a given variable must have the readonly bit set the same way, or the linker will get confused and give warning messages. */ /* We used to round the size up to a multiple of 4, but that causes linker errors sometimes when the variable was initialized since the size of its definition was not likewise rounded up. */ /* Note: the original ASM_OUTPUT_EXTERNAL code has been moved into vms_check_external and vms_flush_pending_externals. */ #define ASM_OUTPUT_EXTERNAL(FILE,DECL,NAME) \ { if (DECL_INITIAL (DECL) == 0 && TREE_CODE (DECL) != FUNCTION_DECL) \ vms_check_external ((DECL), (NAME), 1); \ } /* ASM_OUTPUT_EXTERNAL will have wait until after an initializer is completed in order to switch sections for an external object, so use the DECLARE_OBJECT hooks to manage deferred declarations. */ /* This is the default action for ASM_DECLARE_OBJECT_NAME, but if it is explicitly defined, then ASM_FINISH_DECLARE_OBJECT will be used. */ #define ASM_DECLARE_OBJECT_NAME(ASM_OUT_FILE,NAME,DECL) \ ASM_OUTPUT_LABEL ((ASM_OUT_FILE), (NAME)) /* We don't need to do anything special to finish the current object, but it should now be safe to output any deferred external global declarations. */ #define ASM_FINISH_DECLARE_OBJECT(FILE,DECL,TOPLVL,ATEND) \ vms_flush_pending_externals(FILE) /* Anything still pending must be flushed at the very end. */ #define ASM_FILE_END(STREAM) \ vms_flush_pending_externals(STREAM) /* Here we redefine ASM_OUTPUT_COMMON to select the data_section or the const_section before writing the ".const" assembler directive. If we were specifying a size of zero for external variables, we would not have to select a section, since the assembler can assume that when the size > 0, the storage is for a non-external, uninitialized variable (for which a "const" declaration would be senseless), and the assembler can make the storage read/write. Since the ".const" directive specifies the actual size of the storage used for both external and non-external variables, the assembler cannot make this assumption, and thus it has no way of deciding if storage should be read/write or read-only. To resolve this, we give the assembler some assistance, in the form of a ".const" or a ".data" directive. Under GCC 1.40, external variables were declared with a size of zero. The GNU assembler, GAS, will recognize the "-2" switch when built for VMS; when compiling programs with GCC 2.n this switch should be used or the assembler will not give the read-only attribute to external constants. Failure to use this switch will result in linker warning messages about mismatched psect attributes. */ #undef ASM_OUTPUT_COMMON #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ ( ((TREE_READONLY (decl) && ! TREE_THIS_VOLATILE (decl)) \ ? (const_section (), 0) : (data_section (), 0)), \ fputs (".comm ", (FILE)), \ assemble_name ((FILE), (NAME)), \ fprintf ((FILE), ",%u\n", (SIZE))) /* We define this to prevent the name mangler from putting dollar signs into function names. This isn't really needed, but it has been here for some time and removing it would cause the object files generated by the compiler to be incompatible with the object files from a compiler that had this defined. Since it does no harm, we leave it in. */ #define NO_DOLLAR_IN_LABEL /* Add a "const" section. This is viewed by the assembler as being nearly the same as the "data" section, with the only difference being that a flag is set for variables declared while in the const section. This flag is used to determine whether or not the read/write bit should be set in the Psect definition. */ #define EXTRA_SECTIONS in_const #define EXTRA_SECTION_FUNCTIONS \ void \ const_section () \ { \ if (in_section != in_const) { \ fprintf(asm_out_file,".const\n"); \ in_section = in_const; \ } \ } /* This is used by a hook in varasm.c to write the assembler directives that are needed to tell the startup code which constructors need to be run. */ #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor /* The following definitions are used in libgcc2.c with the __main function. The _SHR symbol is used when the sharable image library for the C++ library is used - this is picked up automatically by the linker and this symbol points to the start of __CTOR_LIST__ from the C++ library. If the C++ library is not used, then __CTOR_LIST_SHR__ occurs just after __CTOR_LIST__, and essentially points to the same list as __CTOR_LIST. */ #ifdef L__main #define __CTOR_LIST__ __gxx_init_0 #define __CTOR_LIST_END__ __gxx_init_2 #define __CTOR_LIST_SHR__ $$PsectAttributes_NOSHR$$__gxx_init_0_shr #define __CTOR_LIST_SHR_END__ $$PsectAttributes_NOSHR$$__gxx_init_2_shr #define DO_GLOBAL_CTORS_BODY \ do { \ func_ptr *p; \ extern func_ptr __CTOR_LIST__[1], __CTOR_LIST_END__[1]; \ extern func_ptr __CTOR_LIST_SHR__[1], __CTOR_LIST_SHR_END__[1]; \ if (&__CTOR_LIST_SHR__[0] != &__CTOR_LIST__[1]) \ for (p = __CTOR_LIST_SHR__ + 1; p < __CTOR_LIST_SHR_END__ ; p++ ) \ if (*p) (*p) (); \ for (p = __CTOR_LIST__ + 1; p < __CTOR_LIST_END__ ; p++ ) \ if (*p) (*p) (); \ do { /* arrange for `return' from main() to pass through exit() */ \ __label__ foo; \ int *callers_caller_fp = (int *) __builtin_frame_address (3); \ register int retval asm ("r0"); \ callers_caller_fp[4] = (int) && foo; \ break; /* out of do-while block */ \ foo: \ exit (retval); \ } while (0); \ } while (0) #define __DTOR_LIST__ __gxx_clean_0 #define __DTOR_LIST_END__ __gxx_clean_2 #define __DTOR_LIST_SHR__ $$PsectAttributes_NOSHR$$__gxx_clean_0_shr #define __DTOR_LIST_SHR_END__ $$PsectAttributes_NOSHR$$__gxx_clean_2_shr #define DO_GLOBAL_DTORS_BODY \ do { \ func_ptr *p; \ extern func_ptr __DTOR_LIST__[1], __DTOR_LIST_END__[1]; \ extern func_ptr __DTOR_LIST_SHR__[1], __DTOR_LIST_SHR_END__[1]; \ for (p = __DTOR_LIST__ + 1; p < __DTOR_LIST_END__ ; p++ ) \ if (*p) (*p) (); \ if (&__DTOR_LIST_SHR__[0] != &__DTOR_LIST__[1]) \ for (p = __DTOR_LIST_SHR__ + 1; p < __DTOR_LIST_SHR_END__ ; p++ ) \ if (*p) (*p) (); \ } while (0) #endif /* L__main */ /* Specify the list of include file directories. */ #define INCLUDE_DEFAULTS \ { \ { "GNU_GXX_INCLUDE:", "G++", 1, 1 }, \ { "GNU_CC_INCLUDE:", "GCC", 0, 0 }, /* GNU includes */ \ { "SYS$SYSROOT:[SYSLIB.]", 0, 0, 0 }, /* VAX-11 "C" includes */ \ { ".", 0, 0, 1 }, /* Make normal VMS filespecs work. */ \ { 0, 0, 0, 0 } \ }