1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1996, 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 /* This enables certain macros in alpha.h, which will make an indirect
24 reference to an external symbol an invalid address. This needs to be
25 defined before we include alpha.h, since it determines which macros
26 are used for GO_IF_*. */
28 #define NO_EXTERNAL_INDIRECT_ADDRESS
30 #include "alpha/alpha.h"
33 #define CPP_PREDEFINES \
34 "-Dalpha -D__ALPHA -Dvms -DVMS -D__alpha__ -D__alpha -D__vms__ -D__VMS__\
35 -Asystem(vms) -Acpu(alpha) -Amachine(alpha)"
39 %{mfloat-ieee:-D__IEEE_FLOAT} \
40 %{mfloat-vax:-D__G_FLOAT} \
41 %{!mfloat-vax:-D__IEEE_FLOAT} \
42 %{!.S: -D__LANGUAGE_C__ -D__LANGUAGE_C %{!ansi:-DLANGUAGE_C}} \
43 %{.S: -D__LANGUAGE_ASSEMBLY__ -D__LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
44 %{.cc: -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
45 %{.cxx: -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
46 %{.C: -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
47 %{.m: -D__LANGUAGE_OBJECTIVE_C__ -D__LANGUAGE_OBJECTIVE_C}"
49 /* We allow $'s in identifiers unless -ansi is used .. */
51 #define DOLLARS_IN_IDENTIFIERS 2
53 /* These match the definitions used in DECCRTL, the VMS C run-time library
55 #define SIZE_TYPE "unsigned int"
56 #define PTRDIFF_TYPE "int"
59 /* Use memcpy for structure copying, and so forth. */
60 #define TARGET_MEM_FUNCTIONS
62 /* By default, allow $ to be part of an identifier. */
63 #define DOLLARS_IN_IDENTIFIERS 2
66 #define TARGET_DEFAULT (MASK_FP|MASK_FPREGS|MASK_GAS|MASK_OPEN_VMS)
68 #define TARGET_NAME "OpenVMS/Alpha"
70 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME);
72 /* The structure return address arrives as an "argument" on VMS. */
73 #undef STRUCT_VALUE_REGNUM
74 #define STRUCT_VALUE 0
75 #undef PCC_STATIC_STRUCT_RETURN
77 /* no floating emulation. */
78 #undef REAL_ARITHMETIC
80 /* "long" is 32 bits. */
82 #define LONG_TYPE_SIZE 32
84 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */
86 #define POINTER_SIZE 32
87 #define POINTERS_EXTEND_UNSIGNED 0
89 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */
91 #undef FIXED_REGISTERS
92 #define FIXED_REGISTERS \
93 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
94 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
95 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
98 #undef CALL_USED_REGISTERS
99 #define CALL_USED_REGISTERS \
100 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
101 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
102 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
103 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
105 #undef HARD_FRAME_POINTER_REGNUM
106 #define HARD_FRAME_POINTER_REGNUM 29
109 #define CAN_ELIMINATE(FROM, TO) \
110 ((TO) != STACK_POINTER_REGNUM || ! alpha_using_fp ())
112 #undef INITIAL_ELIMINATION_OFFSET
113 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
114 { if ((FROM) == FRAME_POINTER_REGNUM) \
115 (OFFSET) = alpha_sa_size () + alpha_pv_save_size (); \
116 else if ((FROM) == ARG_POINTER_REGNUM) \
117 (OFFSET) = (ALPHA_ROUND (alpha_sa_size () + alpha_pv_save_size () \
118 + get_frame_size () \
119 + current_function_pretend_args_size) \
120 - current_function_pretend_args_size); \
121 if ((TO) == STACK_POINTER_REGNUM) \
122 (OFFSET) += ALPHA_ROUND (current_function_outgoing_args_size); \
125 /* Define a data type for recording info about an argument list
126 during the scan of that argument list. This data type should
127 hold all necessary information about the function itself
128 and about the args processed so far, enough to enable macros
129 such as FUNCTION_ARG to determine where the next arg should go.
131 On Alpha/VMS, this is a structure that contains the number of
132 arguments and, for each argument, the datatype of that argument.
134 The number of arguments is a number of words of arguments scanned so far.
135 Thus 6 or more means all following args should go on the stack. */
137 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
138 typedef struct {char num_args; enum avms_arg_type atypes[6];} avms_arg_info;
140 #undef CUMULATIVE_ARGS
141 #define CUMULATIVE_ARGS avms_arg_info
143 /* Initialize a variable CUM of type CUMULATIVE_ARGS
144 for a call to a function whose data type is FNTYPE.
145 For a library call, FNTYPE is 0. */
147 #undef INIT_CUMULATIVE_ARGS
148 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT) \
149 (CUM).num_args = 0; \
150 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
151 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
153 /* Update the data in CUM to advance over an argument
154 of mode MODE and data type TYPE.
155 (TYPE is null for libcalls where that information may not be available.) */
157 extern enum avms_arg_type alpha_arg_type ();
159 /* Determine where to put an argument to a function.
160 Value is zero to push the argument on the stack,
161 or a hard register in which to store the argument.
163 MODE is the argument's machine mode (or VOIDmode for no more args).
164 TYPE is the data type of the argument (as a tree).
165 This is null for libcalls where that information may
167 CUM is a variable of type CUMULATIVE_ARGS which gives info about
168 the preceding args and about the function being called.
169 NAMED is nonzero if this argument is a named parameter
170 (otherwise it is an extra parameter matching an ellipsis).
172 On Alpha the first 6 words of args are normally in registers
173 and the rest are pushed. */
175 extern struct rtx_def *alpha_arg_info_reg_val ();
177 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
178 ((MODE) == VOIDmode ? alpha_arg_info_reg_val (CUM) \
179 : ((CUM.num_args) < 6 && ! MUST_PASS_IN_STACK (MODE, TYPE) \
180 ? gen_rtx(REG, (MODE), \
181 ((CUM).num_args + 16 \
183 && (GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT \
184 || GET_MODE_CLASS (MODE) == MODE_FLOAT)) \
188 #undef FUNCTION_ARG_ADVANCE
189 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
190 if (MUST_PASS_IN_STACK (MODE, TYPE)) \
191 (CUM).num_args += 6; \
194 if ((CUM).num_args < 6) \
195 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \
197 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \
200 /* For an arg passed partly in registers and partly in memory,
201 this is the number of registers used.
202 For args passed entirely in registers or entirely in memory, zero. */
204 #undef FUNCTION_ARG_PARTIAL_NREGS
205 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
206 ((CUM).num_args < 6 && 6 < (CUM).num_args \
207 + ALPHA_ARG_SIZE (MODE, TYPE, NAMED) \
208 ? 6 - (CUM).num_args : 0)
210 /* Perform any needed actions needed for a function that is receiving a
211 variable number of arguments.
213 CUM is as for INIT_CUMULATIVE_ARGS.
215 MODE and TYPE are the mode and type of the current parameter.
217 PRETEND_SIZE is a variable that should be set to the amount of stack
218 that must be pushed by the prolog to pretend that our caller pushed
221 Normally, this macro will push all remaining incoming registers on the
222 stack and set PRETEND_SIZE to the length of the registers pushed.
224 For VMS, we allocate space for all 6 arg registers plus a count.
226 However, if NO registers need to be saved, don't allocate any space.
227 This is not only because we won't need the space, but because AP includes
228 the current_pretend_args_size and we don't want to mess up any
229 ap-relative addresses already made. */
231 #undef SETUP_INCOMING_VARARGS
232 #define SETUP_INCOMING_VARARGS(CUM,MODE,TYPE,PRETEND_SIZE,NO_RTL) \
233 { if ((CUM).num_args < 6) \
237 emit_move_insn (gen_rtx (REG, DImode, 1), \
238 virtual_incoming_args_rtx); \
239 emit_insn (gen_arg_home ()); \
242 PRETEND_SIZE = 7 * UNITS_PER_WORD; \
246 #undef ASM_FILE_START
247 #define ASM_FILE_START(FILE) \
249 alpha_write_verstamp (FILE); \
250 fprintf (FILE, "\t.set noreorder\n"); \
251 fprintf (FILE, "\t.set volatile\n"); \
252 ASM_OUTPUT_SOURCE_FILENAME (FILE, main_input_filename); \
255 #undef ASM_OUTPUT_FLOAT
256 #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
258 if (REAL_VALUE_ISINF (VALUE) \
259 || REAL_VALUE_ISNAN (VALUE) \
260 || REAL_VALUE_MINUS_ZERO (VALUE)) \
263 REAL_VALUE_TO_TARGET_SINGLE ((VALUE), t); \
264 fprintf (FILE, "\t.long 0x%lx\n", t & 0xffffffff); \
269 REAL_VALUE_TO_DECIMAL ((VALUE), "%.20e", str); \
270 fprintf (FILE, "\t.%c_floating %s\n", (TARGET_FLOAT_VAX)?'f':'s', str); \
274 #define LINK_SECTION_ASM_OP ".link"
275 #define READONLY_SECTION_ASM_OP ".rdata"
276 #define LITERALS_SECTION_ASM_OP ".literals"
278 #undef EXTRA_SECTIONS
279 #define EXTRA_SECTIONS in_link, in_rdata, in_literals
281 #undef EXTRA_SECTION_FUNCTIONS
282 #define EXTRA_SECTION_FUNCTIONS \
284 readonly_section () \
286 if (in_section != in_rdata) \
288 fprintf (asm_out_file, "%s\n", READONLY_SECTION_ASM_OP); \
289 in_section = in_rdata; \
295 if (in_section != in_link) \
297 fprintf (asm_out_file, "%s\n", LINK_SECTION_ASM_OP); \
298 in_section = in_link; \
302 literals_section () \
304 if (in_section != in_literals) \
306 fprintf (asm_out_file, "%s\n", LITERALS_SECTION_ASM_OP); \
307 in_section = in_literals; \
311 #undef ASM_OUTPUT_ADDR_DIFF_ELT
312 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) abort ()
314 #undef ASM_OUTPUT_ADDR_VEC_ELT
315 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
316 fprintf (FILE, "\t.quad $L%d\n", (VALUE))
318 #undef READONLY_DATA_SECTION
319 #define READONLY_DATA_SECTION readonly_section
321 #define ASM_FILE_END(FILE) alpha_write_linkage (FILE);
323 #undef CASE_VECTOR_MODE
324 #define CASE_VECTOR_MODE DImode
325 #undef CASE_VECTOR_PC_RELATIVE
327 #undef ASM_OUTPUT_CASE_LABEL
328 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
329 { ASM_OUTPUT_ALIGN (FILE, 3); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }
331 #define NO_MD_PROTOTYPES
333 /* Output assembler code for a block containing the constant parts
334 of a trampoline, leaving space for the variable parts.
336 The trampoline should set the static chain pointer to value placed
337 into the trampoline and should branch to the specified routine.
338 Note that $27 has been set to the address of the trampoline, so we can
339 use it for addressability of the two data items. Trampolines are always
340 aligned to FUNCTION_BOUNDARY, which is 64 bits. */
342 #undef TRAMPOLINE_TEMPLATE
343 #define TRAMPOLINE_TEMPLATE(FILE) \
345 fprintf (FILE, "\t.quad 0\n"); \
346 fprintf (FILE, "\t.linkage __tramp\n"); \
347 fprintf (FILE, "\t.quad 0\n"); \
350 /* Length in units of the trampoline for entering a nested function. */
352 #undef TRAMPOLINE_SIZE
353 #define TRAMPOLINE_SIZE 32
355 /* Emit RTL insns to initialize the variable parts of a trampoline.
356 FNADDR is an RTX for the address of the function's pure code.
357 CXT is an RTX for the static chain value for the function. */
359 #undef INITIALIZE_TRAMPOLINE
360 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
362 emit_move_insn (gen_rtx (MEM, Pmode, \
363 memory_address (Pmode, \
364 plus_constant ((TRAMP), 16))), \
366 emit_move_insn (gen_rtx (MEM, Pmode, \
367 memory_address (Pmode, \
368 plus_constant ((TRAMP), 24))), \
372 #undef TRANSFER_FROM_TRAMPOLINE
374 #define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, NAME, ARGS) \
375 (vms_valid_decl_attribute_p (DECL, ATTRIBUTES, NAME, ARGS))
376 extern int vms_valid_decl_attribute_p ();
378 #undef SDB_DEBUGGING_INFO
379 #undef MIPS_DEBUGGING_INFO
380 #undef DBX_DEBUGGING_INFO
382 #define DWARF2_DEBUGGING_INFO
384 /* This is how to output an assembler line
385 that says to advance the location counter
386 to a multiple of 2**LOG bytes. */
388 #undef ASM_OUTPUT_ALIGN
389 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
390 fprintf (FILE, "\t.align %d\n", LOG);
392 #define UNALIGNED_SHORT_ASM_OP ".word"
393 #define UNALIGNED_INT_ASM_OP ".long"
394 #define UNALIGNED_DOUBLE_INT_ASM_OP ".quad"
396 #undef ASM_OUTPUT_ALIGNED_COMMON
397 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
399 fprintf ((FILE), "\t.comm\t"); \
400 assemble_name ((FILE), (NAME)); \
401 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
404 #define ASM_OUTPUT_SECTION(FILE,SECTION) \
405 (strcmp (SECTION, ".text") == 0) \
407 : named_section (NULL_TREE, SECTION, 0), \
408 ASM_OUTPUT_ALIGN (FILE, 0) \
410 #define ASM_OUTPUT_SECTION_NAME(FILE,DECL,NAME,RELOC) \
415 if (DECL && DECL_MACHINE_ATTRIBUTES (DECL) \
416 && lookup_attribute \
417 ("overlaid", DECL_MACHINE_ATTRIBUTES (DECL))) \
418 flags = ",OVR", ovr = 1; \
419 else if (strncmp (NAME,".debug", 6) == 0) \
423 fputc ('\n', (FILE)); \
424 fprintf (FILE, ".section\t%s%s\n", NAME, flags); \
429 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
430 do { literals_section(); \
431 fprintf ((FILE), "\t"); \
432 assemble_name (FILE, LABEL1); \
433 fprintf (FILE, " = "); \
434 assemble_name (FILE, LABEL2); \
435 fprintf (FILE, "\n"); \
438 #undef PREFERRED_DEBUGGING_TYPE
439 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
441 #undef ASM_FORMAT_PRIVATE_NAME
442 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
443 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 12), \
444 sprintf ((OUTPUT), "%s___%d", (NAME), (LABELNO)))
447 #undef ASM_FINAL_SPEC
449 #undef STARTFILE_SPEC
450 #define ASM_SPEC "-nocpp %{pg}"
451 #define LINK_SPEC "%{g3:-g3} %{g0:-g0} %{shared:-shared} %{v:-v}"
453 /* Define the names of the division and modulus functions. */
454 #define DIVSI3_LIBCALL "OTS$DIV_I"
455 #define DIVDI3_LIBCALL "OTS$DIV_L"
456 #define UDIVSI3_LIBCALL "OTS$DIV_UI"
457 #define UDIVDI3_LIBCALL "OTS$DIV_UL"
458 #define MODSI3_LIBCALL "OTS$REM_I"
459 #define MODDI3_LIBCALL "OTS$REM_L"
460 #define UMODSI3_LIBCALL "OTS$REM_UI"
461 #define UMODDI3_LIBCALL "OTS$REM_UL"