[Committed] Make gimple_could_trap_p const-safe.

[Roger Sayle]

On Mon, Jul 12, 2021 Richard Biener <richard.guent...@gmail.com> wrote:
> There's const-correctness pieces in your patch - those are OK under the 
> obvious rule and you might want to push them separately.

Allow gimple_could_trap_p (which previously took a non-const gimple)
to be called from functions that take a const gimple (such as
gimple_has_side_effects), and update its prototypes.

These chunks have been (re)tested on x86_64-pc-linux-gnu with a
"make bootstrap" and "make -k check" with no new failures.

Committed to mainline as obvious/pre-approved.

2021-07-13  Roger Sayle  <ro...@nextmovesoftware.com>
            Richard Biener  <rguent...@suse.de>

gcc/ChangeLog
        * gimple.c (gimple_could_trap_p_1):  Make S argument a
        "const gimple*".  Preserve constness in call to
        gimple_asm_volatile_p.
        (gimple_could_trap_p): Make S argument a "const gimple*".
        * gimple.h (gimple_could_trap_p_1, gimple_could_trap_p):
        Update function prototypes.

Thanks,
Roger
--


diff --git a/gcc/gimple.c b/gcc/gimple.c
index f1044e9..66edc1e 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -2129,7 +2136,7 @@ gimple_has_side_effects (const gimple *s)
    S is a GIMPLE_ASSIGN, the LHS of the assignment is also checked.  */
 
 bool
-gimple_could_trap_p_1 (gimple *s, bool include_mem, bool include_stores)
+gimple_could_trap_p_1 (const gimple *s, bool include_mem, bool include_stores)
 {
   tree t, div = NULL_TREE;
   enum tree_code op;
@@ -2146,7 +2153,7 @@ gimple_could_trap_p_1 (gimple *s, bool include_mem, bool 
include_stores)
   switch (gimple_code (s))
     {
     case GIMPLE_ASM:
-      return gimple_asm_volatile_p (as_a <gasm *> (s));
+      return gimple_asm_volatile_p (as_a <const gasm *> (s));
 
     case GIMPLE_CALL:
       t = gimple_call_fndecl (s);
@@ -2192,7 +2199,7 @@ gimple_could_trap_p_1 (gimple *s, bool include_mem, bool 
include_stores)
 /* Return true if statement S can trap.  */
 
 bool
-gimple_could_trap_p (gimple *s)
+gimple_could_trap_p (const gimple *s)
 {
   return gimple_could_trap_p_1 (s, true, true);
 }
diff --git a/gcc/gimple.h b/gcc/gimple.h
index e7dc2a4..1a2e120 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1601,8 +1601,8 @@ void gimple_set_lhs (gimple *, tree);
 gimple *gimple_copy (gimple *);
 void gimple_move_vops (gimple *, gimple *);
 bool gimple_has_side_effects (const gimple *);
-bool gimple_could_trap_p_1 (gimple *, bool, bool);
-bool gimple_could_trap_p (gimple *);
+bool gimple_could_trap_p_1 (const gimple *, bool, bool);
+bool gimple_could_trap_p (const gimple *);
 bool gimple_assign_rhs_could_trap_p (gimple *);
 extern void dump_gimple_statistics (void);
 unsigned get_gimple_rhs_num_ops (enum tree_code);