And, at the same time, allow indirect calls to have a static chain.
We'll always eliminate the static chain if we can prove it's unused.
* calls.c (prepare_call_address): Allow decl or type for first arg.
(expand_call): Pass type to prepare_call_address if no decl.
* gimple-fold.c (gimple_fold_call): Eliminate the static chain if
the function doesn't use it; fold it otherwise.
* gimplify.c (gimplify_call_expr): Gimplify the static chain.
* tree-cfg.c (verify_gimple_call): Allow a static chain on indirect
function calls.
---
gcc/ChangeLog | 8 ++++++++
gcc/calls.c | 14 ++++++++------
gcc/gimple-fold.c | 21 +++++++++++++++++++++
gcc/gimplify.c | 17 ++++++++++++++++-
gcc/tree-cfg.c | 22 +++++++---------------
5 files changed, 60 insertions(+), 22 deletions(-)
diff --git a/gcc/calls.c b/gcc/calls.c
index 7f55aaf..c64c0eb 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -197,7 +197,7 @@ static void restore_fixed_argument_area (rtx, rtx, int,
int);
CALL_INSN_FUNCTION_USAGE information. */
rtx
-prepare_call_address (tree fndecl, rtx funexp, rtx static_chain_value,
+prepare_call_address (tree fndecl_or_type, rtx funexp, rtx static_chain_value,
rtx *call_fusage, int reg_parm_seen, int sibcallp)
{
/* Make a valid memory address and copy constants through pseudo-regs,
@@ -217,12 +217,13 @@ prepare_call_address (tree fndecl, rtx funexp, rtx
static_chain_value,
#endif
}
- if (static_chain_value != 0)
+ if (static_chain_value != 0
+ && (TREE_CODE (fndecl_or_type) != FUNCTION_DECL
+ || DECL_STATIC_CHAIN (fndecl_or_type)))
{
rtx chain;
- gcc_assert (fndecl);
- chain = targetm.calls.static_chain (fndecl, false);
+ chain = targetm.calls.static_chain (fndecl_or_type, false);
static_chain_value = convert_memory_address (Pmode, static_chain_value);
emit_move_insn (chain, static_chain_value);
@@ -3278,8 +3279,9 @@ expand_call (tree exp, rtx target, int ignore)
}
after_args = get_last_insn ();
- funexp = prepare_call_address (fndecl, funexp, static_chain_value,
- &call_fusage, reg_parm_seen, pass == 0);
+ funexp = prepare_call_address (fndecl ? fndecl : fntype, funexp,
+ static_chain_value, &call_fusage,
+ reg_parm_seen, pass == 0);
load_register_parameters (args, num_actuals, &call_fusage, flags,
pass == 0, &sibcall_failure);
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index acdadcd..4f716b2 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -2723,6 +2723,27 @@ gimple_fold_call (gimple_stmt_iterator *gsi, bool
inplace)
}
}
+ /* Check for indirect calls that became direct calls, and then
+ no longer require a static chain. */
+ if (gimple_call_chain (stmt))
+ {
+ tree fn = gimple_call_fndecl (stmt);
+ if (fn && !DECL_STATIC_CHAIN (fn))
+ {
+ gimple_call_set_chain (stmt, NULL);
+ changed = true;
+ }
+ else
+ {
+ tree tmp = maybe_fold_reference (gimple_call_chain (stmt), false);
+ if (tmp)
+ {
+ gimple_call_set_chain (stmt, tmp);
+ changed = true;
+ }
+ }
+ }
+
if (inplace)
return changed;
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 93c06de..c46fb66 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -2432,7 +2432,7 @@ gimplify_call_expr (tree *expr_p, gimple_seq *pre_p, bool
want_value)
}
}
- /* Finally, gimplify the function arguments. */
+ /* Gimplify the function arguments. */
if (nargs > 0)
{
for (i = (PUSH_ARGS_REVERSED ? nargs - 1 : 0);
@@ -2454,6 +2454,21 @@ gimplify_call_expr (tree *expr_p, gimple_seq *pre_p,
bool want_value)
}
}
+ /* Gimplify the static chain. */
+ if (CALL_EXPR_STATIC_CHAIN (*expr_p))
+ {
+ if (fndecl && !DECL_STATIC_CHAIN (fndecl))
+ CALL_EXPR_STATIC_CHAIN (*expr_p) = NULL;
+ else
+ {
+ enum gimplify_status t;
+ t = gimplify_arg (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p,
+ EXPR_LOCATION (*expr_p));
+ if (t == GS_ERROR)
+ ret = GS_ERROR;
+ }
+ }
+
/* Verify the function result. */
if (want_value && fndecl
&& VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fnptrtype))))
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 9dd8961..71a828c 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -3333,22 +3333,14 @@ verify_gimple_call (gimple stmt)
return true;
}
- /* If there is a static chain argument, this should not be an indirect
- call, and the decl should have DECL_STATIC_CHAIN set. */
- if (gimple_call_chain (stmt))
+ /* If there is a static chain argument, the call should either be
+ indirect, or the decl should have DECL_STATIC_CHAIN set. */
+ if (gimple_call_chain (stmt)
+ && fndecl
+ && !DECL_STATIC_CHAIN (fndecl))
{
- if (!gimple_call_fndecl (stmt))
- {
- error ("static chain in indirect gimple call");
- return true;
- }
- fn = TREE_OPERAND (fn, 0);
-
- if (!DECL_STATIC_CHAIN (fn))
- {
- error ("static chain with function that doesn%'t use one");
- return true;
- }
+ error ("static chain with function that doesn%'t use one");
+ return true;
}
/* ??? The C frontend passes unpromoted arguments in case it
--
1.9.3
