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(STACK_CHECK_*): Provide default values. 

(probe_stack_range): New declaration.

From-SVN: r14467
This commit is contained in:
Richard Kenner 1997-07-17 11:24:57 -04:00
parent 16d856c1bb
commit f7761c9ad9
1 changed files with 48 additions and 1 deletions
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49
gcc/expr.h
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@ -1,5 +1,5 @@
/* Definitions for code generation pass of GNU compiler.
Copyright (C) 1987, 91-95, 1996 Free Software Foundation, Inc.
Copyright (C) 1987, 91-96, 1997 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -215,6 +215,46 @@ enum direction {none, upward, downward}; /* Value has this type. */
#ifndef RETURN_IN_MEMORY
#define RETURN_IN_MEMORY(TYPE) (TYPE_MODE (TYPE) == BLKmode)
#endif
/* Provide default values for the macros controlling stack checking. */
#ifndef STACK_CHECK_BUILTIN
#define STACK_CHECK_BUILTIN 0
#endif
/* The default interval is one page. */
#ifndef STACK_CHECK_PROBE_INTERVAL
#define STACK_CHECK_PROBE_INTERVAL 4096
#endif
/* The default is to do a store into the stack. */
#ifndef STACK_CHECK_PROBE_LOAD
#define STACK_CHECK_PROBE_LOAD 0
#endif
/* This value is arbitrary, but should be sufficient for most machines. */
#ifndef STACK_CHECK_PROTECT
#define STACK_CHECK_PROTECT (75 * UNITS_PER_WORD)
#endif
/* Make the maximum frame size be the largest we can and still only need
one probe per function. */
#ifndef STACK_CHECK_MAX_FRAME_SIZE
#define STACK_CHECK_MAX_FRAME_SIZE \
(STACK_CHECK_PROBE_INTERVAL - UNITS_PER_WORD)
#endif
/* This is arbitrary, but should be large enough everywhere. */
#ifndef STACK_CHECK_FIXED_FRAME_SIZE
#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
#endif
/* Provide a reasonable default for the maximum size of an object to
allocate in the fixed frame. We may need to be able to make this
controllable by the user at some point. */
#ifndef STACK_CHECK_MAX_VAR_SIZE
#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
#endif
/* Optabs are tables saying how to generate insn bodies
for various machine modes and numbers of operands.
@ -839,6 +879,13 @@ extern void emit_stack_restore PROTO((enum save_level, rtx, rtx));
says how many bytes. */
extern rtx allocate_dynamic_stack_space PROTO((rtx, rtx, int));
/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
FIRST is a constant and size is a Pmode RTX. These are offsets from the
current stack pointer. STACK_GROWS_DOWNWARD says whether to add or
subtract from the stack. If SIZE is constant, this is done
with a fixed number of probes. Otherwise, we must make a loop. */
extern void probe_stack_range PROTO((HOST_WIDE_INT, rtx));
/* Return an rtx that refers to the value returned by a library call
in its original home. This becomes invalid if any more code is emitted. */
extern rtx hard_libcall_value PROTO((enum machine_mode));