1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1996, 1997, 1998, 2000 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 "-D__ALPHA -Dvms -DVMS -D__vms__ -D__VMS__ -Asystem(vms)"
36 #undef CPP_SUBTARGET_SPEC
37 #define CPP_SUBTARGET_SPEC "\
38 %{mfloat-ieee:-D__IEEE_FLOAT} \
39 %{mfloat-vax:-D__G_FLOAT} \
40 %{!mfloat-vax:-D__IEEE_FLOAT}"
42 /* Under OSF4, -p and -pg require -lprof1, and -lprof1 requires -lpdf. */
44 #define LIB_SPEC "%{p:-lprof1 -lpdf} %{pg:-lprof1 -lpdf} %{a:-lprof2} -lc"
46 /* Pass "-G 8" to ld because Alpha's CC does. Pass -O3 if we are
47 optimizing, -O1 if we are not. Pass -shared, -non_shared or
48 -call_shared as appropriate. Also pass -pg. */
50 "-G 8 %{O*:-O3} %{!O*:-O1} %{static:-non_shared} \
51 %{!static:%{shared:-shared} %{!shared:-call_shared}} %{pg} %{taso} \
54 /* We allow $'s in identifiers unless -ansi is used .. */
56 #define DOLLARS_IN_IDENTIFIERS 2
58 /* These match the definitions used in DECCRTL, the VMS C run-time library
60 #define SIZE_TYPE "unsigned int"
61 #define PTRDIFF_TYPE "int"
64 /* By default, allow $ to be part of an identifier. */
65 #define DOLLARS_IN_IDENTIFIERS 2
68 #define TARGET_DEFAULT (MASK_FP|MASK_FPREGS|MASK_GAS)
69 #undef TARGET_OPEN_VMS
70 #define TARGET_OPEN_VMS 1
73 #define TARGET_NAME "OpenVMS/Alpha"
75 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME);
77 /* The structure return address arrives as an "argument" on VMS. */
78 #undef STRUCT_VALUE_REGNUM
79 #define STRUCT_VALUE 0
80 #undef PCC_STATIC_STRUCT_RETURN
82 /* no floating emulation. */
83 #undef REAL_ARITHMETIC
85 /* "long" is 32 bits. */
87 #define LONG_TYPE_SIZE 32
89 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */
91 #define POINTER_SIZE 32
92 #define POINTERS_EXTEND_UNSIGNED 0
94 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */
96 #undef FIXED_REGISTERS
97 #define FIXED_REGISTERS \
98 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
99 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
100 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
101 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
103 #undef CALL_USED_REGISTERS
104 #define CALL_USED_REGISTERS \
105 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
106 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
107 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
108 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
110 #undef HARD_FRAME_POINTER_REGNUM
111 #define HARD_FRAME_POINTER_REGNUM 29
114 #define CAN_ELIMINATE(FROM, TO) \
115 ((TO) != STACK_POINTER_REGNUM || ! alpha_using_fp ())
117 #undef INITIAL_ELIMINATION_OFFSET
118 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
119 { if ((FROM) == FRAME_POINTER_REGNUM) \
120 (OFFSET) = alpha_sa_size () + alpha_pv_save_size (); \
121 else if ((FROM) == ARG_POINTER_REGNUM) \
122 (OFFSET) = (ALPHA_ROUND (alpha_sa_size () + alpha_pv_save_size () \
123 + get_frame_size () \
124 + current_function_pretend_args_size) \
125 - current_function_pretend_args_size); \
126 if ((TO) == STACK_POINTER_REGNUM) \
127 (OFFSET) += ALPHA_ROUND (current_function_outgoing_args_size); \
130 /* Define a data type for recording info about an argument list
131 during the scan of that argument list. This data type should
132 hold all necessary information about the function itself
133 and about the args processed so far, enough to enable macros
134 such as FUNCTION_ARG to determine where the next arg should go.
136 On Alpha/VMS, this is a structure that contains the number of
137 arguments and, for each argument, the datatype of that argument.
139 The number of arguments is a number of words of arguments scanned so far.
140 Thus 6 or more means all following args should go on the stack. */
142 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
143 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
145 #undef CUMULATIVE_ARGS
146 #define CUMULATIVE_ARGS avms_arg_info
148 /* Initialize a variable CUM of type CUMULATIVE_ARGS
149 for a call to a function whose data type is FNTYPE.
150 For a library call, FNTYPE is 0. */
152 #undef INIT_CUMULATIVE_ARGS
153 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT) \
154 (CUM).num_args = 0; \
155 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
156 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
158 #undef FUNCTION_ARG_ADVANCE
159 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
160 if (MUST_PASS_IN_STACK (MODE, TYPE)) \
161 (CUM).num_args += 6; \
164 if ((CUM).num_args < 6) \
165 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \
167 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \
170 /* For an arg passed partly in registers and partly in memory,
171 this is the number of registers used.
172 For args passed entirely in registers or entirely in memory, zero. */
174 #undef FUNCTION_ARG_PARTIAL_NREGS
175 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
176 ((CUM).num_args < 6 && 6 < (CUM).num_args \
177 + ALPHA_ARG_SIZE (MODE, TYPE, NAMED) \
178 ? 6 - (CUM).num_args : 0)
180 /* Perform any needed actions needed for a function that is receiving a
181 variable number of arguments.
183 CUM is as for INIT_CUMULATIVE_ARGS.
185 MODE and TYPE are the mode and type of the current parameter.
187 PRETEND_SIZE is a variable that should be set to the amount of stack
188 that must be pushed by the prolog to pretend that our caller pushed
191 Normally, this macro will push all remaining incoming registers on the
192 stack and set PRETEND_SIZE to the length of the registers pushed.
194 For VMS, we allocate space for all 6 arg registers plus a count.
196 However, if NO registers need to be saved, don't allocate any space.
197 This is not only because we won't need the space, but because AP includes
198 the current_pretend_args_size and we don't want to mess up any
199 ap-relative addresses already made. */
201 #undef SETUP_INCOMING_VARARGS
202 #define SETUP_INCOMING_VARARGS(CUM,MODE,TYPE,PRETEND_SIZE,NO_RTL) \
203 { if ((CUM).num_args < 6) \
207 emit_move_insn (gen_rtx_REG (DImode, 1), \
208 virtual_incoming_args_rtx); \
209 emit_insn (gen_arg_home ()); \
212 PRETEND_SIZE = 7 * UNITS_PER_WORD; \
216 #undef ASM_FILE_START
217 #define ASM_FILE_START(FILE) \
219 alpha_write_verstamp (FILE); \
220 fprintf (FILE, "\t.set noreorder\n"); \
221 fprintf (FILE, "\t.set volatile\n"); \
222 ASM_OUTPUT_SOURCE_FILENAME (FILE, main_input_filename); \
225 #undef ASM_OUTPUT_FLOAT
226 #define ASM_OUTPUT_FLOAT(FILE,VALUE) \
228 if (REAL_VALUE_ISINF (VALUE) \
229 || REAL_VALUE_ISNAN (VALUE) \
230 || REAL_VALUE_MINUS_ZERO (VALUE)) \
233 REAL_VALUE_TO_TARGET_SINGLE ((VALUE), t); \
234 fprintf (FILE, "\t.long 0x%lx\n", t & 0xffffffff); \
239 REAL_VALUE_TO_DECIMAL ((VALUE), "%.20e", str); \
240 fprintf (FILE, "\t.%c_floating %s\n", (TARGET_FLOAT_VAX)?'f':'s', str); \
244 #define LINK_SECTION_ASM_OP "\t.link"
245 #define READONLY_SECTION_ASM_OP "\t.rdata"
246 #define LITERALS_SECTION_ASM_OP "\t.literals"
247 #define CTORS_SECTION_ASM_OP "\t.ctors"
248 #define DTORS_SECTION_ASM_OP "\t.dtors"
250 #undef EXTRA_SECTIONS
251 #define EXTRA_SECTIONS in_link, in_rdata, in_literals, in_ctors, in_dtors
253 #undef EXTRA_SECTION_FUNCTIONS
254 #define EXTRA_SECTION_FUNCTIONS \
256 readonly_section () \
258 if (in_section != in_rdata) \
260 fprintf (asm_out_file, "%s\n", READONLY_SECTION_ASM_OP); \
261 in_section = in_rdata; \
267 if (in_section != in_link) \
269 fprintf (asm_out_file, "%s\n", LINK_SECTION_ASM_OP); \
270 in_section = in_link; \
274 literals_section () \
276 if (in_section != in_literals) \
278 fprintf (asm_out_file, "%s\n", LITERALS_SECTION_ASM_OP); \
279 in_section = in_literals; \
285 if (in_section != in_ctors) \
287 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
288 in_section = in_ctors; \
294 if (in_section != in_dtors) \
296 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
297 in_section = in_dtors; \
301 extern void readonly_section PARAMS ((void));
302 extern void link_section PARAMS ((void));
303 extern void literals_section PARAMS ((void));
304 extern void ctors_section PARAMS ((void));
305 extern void dtors_section PARAMS ((void));
307 #undef ASM_OUTPUT_ADDR_DIFF_ELT
308 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) abort ()
310 #undef ASM_OUTPUT_ADDR_VEC_ELT
311 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
312 fprintf (FILE, "\t.quad $L%d\n", (VALUE))
314 #undef READONLY_DATA_SECTION
315 #define READONLY_DATA_SECTION readonly_section
317 #define ASM_FILE_END(FILE) alpha_write_linkage (FILE);
319 #undef CASE_VECTOR_MODE
320 #define CASE_VECTOR_MODE DImode
321 #undef CASE_VECTOR_PC_RELATIVE
323 #undef ASM_OUTPUT_CASE_LABEL
324 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
325 { ASM_OUTPUT_ALIGN (FILE, 3); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }
327 /* This says how to output assembler code to declare an
328 uninitialized external linkage data object. */
330 #define COMMON_ASM_OP "\t.comm\t"
332 #undef ASM_OUTPUT_ALIGNED_COMMON
333 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
335 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
336 assemble_name ((FILE), (NAME)); \
337 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
341 /* Output assembler code for a block containing the constant parts
342 of a trampoline, leaving space for the variable parts.
344 The trampoline should set the static chain pointer to value placed
345 into the trampoline and should branch to the specified routine.
346 Note that $27 has been set to the address of the trampoline, so we can
347 use it for addressability of the two data items. Trampolines are always
348 aligned to FUNCTION_BOUNDARY, which is 64 bits. */
350 #undef TRAMPOLINE_TEMPLATE
351 #define TRAMPOLINE_TEMPLATE(FILE) \
353 fprintf (FILE, "\t.quad 0\n"); \
354 fprintf (FILE, "\t.linkage __tramp\n"); \
355 fprintf (FILE, "\t.quad 0\n"); \
358 /* Length in units of the trampoline for entering a nested function. */
360 #undef TRAMPOLINE_SIZE
361 #define TRAMPOLINE_SIZE 32
363 /* Emit RTL insns to initialize the variable parts of a trampoline.
364 FNADDR is an RTX for the address of the function's pure code.
365 CXT is an RTX for the static chain value for the function. */
367 #undef INITIALIZE_TRAMPOLINE
368 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
369 alpha_initialize_trampoline (TRAMP, FNADDR, CXT, 16, 24, -1)
371 /* A C statement (sans semicolon) to output an element in the table of
372 global constructors. */
373 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
376 fprintf (FILE, "\t.quad "); \
377 assemble_name (FILE, NAME); \
378 fprintf (FILE, "\n"); \
381 /* A C statement (sans semicolon) to output an element in the table of
382 global destructors. */
383 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
386 fprintf (FILE, "\t.quad "); \
387 assemble_name (FILE, NAME); \
388 fprintf (FILE, "\n"); \
391 #define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, NAME, ARGS) \
392 (vms_valid_decl_attribute_p (DECL, ATTRIBUTES, NAME, ARGS))
394 #undef SDB_DEBUGGING_INFO
395 #undef MIPS_DEBUGGING_INFO
396 #undef DBX_DEBUGGING_INFO
398 #define DWARF2_DEBUGGING_INFO
400 /* This is how to output an assembler line
401 that says to advance the location counter
402 to a multiple of 2**LOG bytes. */
404 #undef ASM_OUTPUT_ALIGN
405 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
406 fprintf (FILE, "\t.align %d\n", LOG);
408 #define ASM_OUTPUT_SECTION(FILE,SECTION) \
409 (strcmp (SECTION, ".text") == 0) \
411 : named_section (NULL_TREE, SECTION, 0), \
412 ASM_OUTPUT_ALIGN (FILE, 0) \
414 #define ASM_OUTPUT_SECTION_NAME(FILE,DECL,NAME,RELOC) \
419 if (DECL && DECL_MACHINE_ATTRIBUTES (DECL) \
420 && lookup_attribute \
421 ("overlaid", DECL_MACHINE_ATTRIBUTES (DECL))) \
422 flags = ",OVR", ovr = 1; \
423 else if (strncmp (NAME,".debug", 6) == 0) \
427 fputc ('\n', (FILE)); \
428 fprintf (FILE, ".section\t%s%s\n", NAME, flags); \
433 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
434 do { literals_section(); \
435 fprintf ((FILE), "\t"); \
436 assemble_name (FILE, LABEL1); \
437 fprintf (FILE, " = "); \
438 assemble_name (FILE, LABEL2); \
439 fprintf (FILE, "\n"); \
442 #undef PREFERRED_DEBUGGING_TYPE
443 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
445 #undef ASM_FORMAT_PRIVATE_NAME
446 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
447 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 12), \
448 sprintf ((OUTPUT), "%s___%d", (NAME), (LABELNO)))
450 /* ??? VMS uses different linkage. */
451 #undef ASM_OUTPUT_MI_THUNK
454 #undef ASM_FINAL_SPEC
456 #undef STARTFILE_SPEC
457 #define ASM_SPEC "-nocpp %{pg}"
458 #define LINK_SPEC "%{g3:-g3} %{g0:-g0} %{shared:-shared} %{v:-v}"
460 /* Define the names of the division and modulus functions. */
461 #define DIVSI3_LIBCALL "OTS$DIV_I"
462 #define DIVDI3_LIBCALL "OTS$DIV_L"
463 #define UDIVSI3_LIBCALL "OTS$DIV_UI"
464 #define UDIVDI3_LIBCALL "OTS$DIV_UL"
465 #define MODSI3_LIBCALL "OTS$REM_I"
466 #define MODDI3_LIBCALL "OTS$REM_L"
467 #define UMODSI3_LIBCALL "OTS$REM_UI"
468 #define UMODDI3_LIBCALL "OTS$REM_UL"
470 #define DIR_SEPARATOR ']'
472 #define PREFIX "GNU_ROOT:"