static unsigned int
lower_function_body (void)
{
struct lower_data data;
gimple_seq body = gimple_body (current_function_decl);
gimple_seq lowered_body;
gimple_stmt_iterator i;
gimple bind;
tree t;
gimple x;
/* The gimplifier should've left a body of exactly one statement,
namely a GIMPLE_BIND. */
gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
&& gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);
memset (&data, 0, sizeof (data));
data.block = DECL_INITIAL (current_function_decl);
BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
BLOCK_CHAIN (data.block) = NULL_TREE;
TREE_ASM_WRITTEN (data.block) = 1;
data.return_statements.create (8);
bind = gimple_seq_first_stmt (body);
lowered_body = NULL;
gimple_seq_add_stmt (&lowered_body, bind);
i = gsi_start (lowered_body);
lower_gimple_bind (&i, &data);
i = gsi_last (lowered_body);
/* If the function falls off the end, we need a null return statement.
If we've already got one in the return_statements vector, we don't
need to do anything special. Otherwise build one by hand. */
if (gimple_seq_may_fallthru (lowered_body)
&& (data.return_statements.is_empty ()
|| gimple_return_retval (data.return_statements.last().stmt) != NULL))
{
x = gimple_build_return (NULL);
gimple_set_location (x, cfun->function_end_locus);
gimple_set_block (x, DECL_INITIAL (current_function_decl));
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
}
/* If we lowered any return statements, emit the representative
at the end of the function. */
while (!data.return_statements.is_empty ())
{
return_statements_t t = data.return_statements.pop ();
x = gimple_build_label (t.label);
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
}
/* If the function calls __builtin_setjmp, we need to emit the computed
goto that will serve as the unique dispatcher for all the receivers. */
if (data.calls_builtin_setjmp)
{
tree disp_label, disp_var, arg;
/* Build 'DISP_LABEL:' and insert. */
disp_label = create_artificial_label (cfun->function_end_locus);
/* This mark will create forward edges from every call site. */
DECL_NONLOCAL (disp_label) = 1;
cfun->has_nonlocal_label = 1;
x = gimple_build_label (disp_label);
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
/* Build 'DISP_VAR = __builtin_setjmp_dispatcher (DISP_LABEL);'
and insert. */
disp_var = create_tmp_var (ptr_type_node, "setjmpvar");
arg = build_addr (disp_label, current_function_decl);
t = builtin_decl_implicit (BUILT_IN_SETJMP_DISPATCHER);
x = gimple_build_call (t, 1, arg);
gimple_call_set_lhs (x, disp_var);
/* Build 'goto DISP_VAR;' and insert. */
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
x = gimple_build_goto (disp_var);
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
}
/* Once the old body has been lowered, replace it with the new
lowered sequence. */
gimple_set_body (current_function_decl, lowered_body);
gcc_assert (data.block == DECL_INITIAL (current_function_decl));
BLOCK_SUBBLOCKS (data.block)
= blocks_nreverse (BLOCK_SUBBLOCKS (data.block));
clear_block_marks (data.block);
data.return_statements.release ();
return 0;
}
static void
lower_stmt (gimple_stmt_iterator *gsi, struct lower_data *data)
{
gimple stmt = gsi_stmt (*gsi);
gimple_set_block (stmt, data->block);
switch (gimple_code (stmt))
{
case GIMPLE_BIND:
lower_gimple_bind (gsi, data);
/* Propagate fallthruness. */
return;
case GIMPLE_COND:
case GIMPLE_GOTO:
case GIMPLE_SWITCH:
data->cannot_fallthru = true;
gsi_next (gsi);
return;
case GIMPLE_RETURN:
if (data->cannot_fallthru)
{
gsi_remove (gsi, false);
/* Propagate fallthruness. */
}
else
{
lower_gimple_return (gsi, data);
data->cannot_fallthru = true;
}
return;
case GIMPLE_TRY:
if (gimple_try_kind (stmt) == GIMPLE_TRY_CATCH)
lower_try_catch (gsi, data);
else
{
/* It must be a GIMPLE_TRY_FINALLY. */
bool cannot_fallthru;
lower_sequence (gimple_try_eval_ptr (stmt), data);
cannot_fallthru = data->cannot_fallthru;
/* The finally clause is always executed after the try clause,
so if it does not fall through, then the try-finally will not
fall through. Otherwise, if the try clause does not fall
through, then when the finally clause falls through it will
resume execution wherever the try clause was going. So the
whole try-finally will only fall through if both the try
clause and the finally clause fall through. */
data->cannot_fallthru = false;
lower_sequence (gimple_try_cleanup_ptr (stmt), data);
data->cannot_fallthru |= cannot_fallthru;
gsi_next (gsi);
}
return;
case GIMPLE_EH_ELSE:
lower_sequence (gimple_eh_else_n_body_ptr (stmt), data);
lower_sequence (gimple_eh_else_e_body_ptr (stmt), data);
break;
case GIMPLE_NOP:
case GIMPLE_ASM:
case GIMPLE_ASSIGN:
case GIMPLE_PREDICT:
case GIMPLE_LABEL:
case GIMPLE_EH_MUST_NOT_THROW:
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SECTIONS_SWITCH:
case GIMPLE_OMP_SECTION:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
case GIMPLE_OMP_RETURN:
case GIMPLE_OMP_ATOMIC_LOAD:
case GIMPLE_OMP_ATOMIC_STORE:
case GIMPLE_OMP_CONTINUE:
break;
case GIMPLE_CALL:
{
tree decl = gimple_call_fndecl (stmt);
unsigned i;
for (i = 0; i < gimple_call_num_args (stmt); i++)
{
tree arg = gimple_call_arg (stmt, i);
if (EXPR_P (arg))
TREE_SET_BLOCK (arg, data->block);
}
if (decl
&& DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
&& DECL_FUNCTION_CODE (decl) == BUILT_IN_SETJMP)
{
lower_builtin_setjmp (gsi);
data->cannot_fallthru = false;
data->calls_builtin_setjmp = true;
return;
}
if (decl && (flags_from_decl_or_type (decl) & ECF_NORETURN))
{
data->cannot_fallthru = true;
gsi_next (gsi);
return;
}
}
break;
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
data->cannot_fallthru = false;
lower_omp_directive (gsi, data);
data->cannot_fallthru = false;
return;
case GIMPLE_TRANSACTION:
lower_sequence (gimple_transaction_body_ptr (stmt), data);
break;
default:
gcc_unreachable ();
}
data->cannot_fallthru = false;
gsi_next (gsi);
}
static unsigned int
lower_function_body (void)
{
struct lower_data data;
gimple_seq body = gimple_body (current_function_decl);
gimple_seq lowered_body;
gimple_stmt_iterator i;
gimple *bind;
gimple *x;
/* The gimplifier should've left a body of exactly one statement,
namely a GIMPLE_BIND. */
gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
&& gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);
memset (&data, 0, sizeof (data));
data.block = DECL_INITIAL (current_function_decl);
BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
BLOCK_CHAIN (data.block) = NULL_TREE;
TREE_ASM_WRITTEN (data.block) = 1;
data.return_statements.create (8);
bind = gimple_seq_first_stmt (body);
lowered_body = NULL;
gimple_seq_add_stmt (&lowered_body, bind);
i = gsi_start (lowered_body);
lower_gimple_bind (&i, &data);
i = gsi_last (lowered_body);
/* If we had begin stmt markers from e.g. PCH, but this compilation
doesn't want them, lower_stmt will have cleaned them up; we can
now clear the flag that indicates we had them. */
if (!MAY_HAVE_DEBUG_MARKER_STMTS && cfun->debug_nonbind_markers)
{
/* This counter needs not be exact, but before lowering it will
most certainly be. */
gcc_assert (cfun->debug_marker_count == 0);
cfun->debug_nonbind_markers = false;
}
/* If the function falls off the end, we need a null return statement.
If we've already got one in the return_statements vector, we don't
need to do anything special. Otherwise build one by hand. */
bool may_fallthru = gimple_seq_may_fallthru (lowered_body);
if (may_fallthru
&& (data.return_statements.is_empty ()
|| (gimple_return_retval (data.return_statements.last().stmt)
!= NULL)))
{
x = gimple_build_return (NULL);
gimple_set_location (x, cfun->function_end_locus);
gimple_set_block (x, DECL_INITIAL (current_function_decl));
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
may_fallthru = false;
}
/* If we lowered any return statements, emit the representative
at the end of the function. */
while (!data.return_statements.is_empty ())
{
return_statements_t t = data.return_statements.pop ();
x = gimple_build_label (t.label);
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
if (may_fallthru)
{
/* Remove the line number from the representative return statement.
It now fills in for the fallthru too. Failure to remove this
will result in incorrect results for coverage analysis. */
gimple_set_location (t.stmt, UNKNOWN_LOCATION);
may_fallthru = false;
}
}
/* Once the old body has been lowered, replace it with the new
lowered sequence. */
gimple_set_body (current_function_decl, lowered_body);
gcc_assert (data.block == DECL_INITIAL (current_function_decl));
BLOCK_SUBBLOCKS (data.block)
= blocks_nreverse (BLOCK_SUBBLOCKS (data.block));
clear_block_marks (data.block);
data.return_statements.release ();
return 0;
}
static unsigned int
lower_function_body (void)
{
struct lower_data data;
gimple_seq body = gimple_body (current_function_decl);
gimple_seq lowered_body;
gimple_stmt_iterator i;
gimple bind;
gimple x;
/* The gimplifier should've left a body of exactly one statement,
namely a GIMPLE_BIND. */
gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
&& gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);
memset (&data, 0, sizeof (data));
data.block = DECL_INITIAL (current_function_decl);
BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
BLOCK_CHAIN (data.block) = NULL_TREE;
TREE_ASM_WRITTEN (data.block) = 1;
data.return_statements.create (8);
bind = gimple_seq_first_stmt (body);
lowered_body = NULL;
gimple_seq_add_stmt (&lowered_body, bind);
i = gsi_start (lowered_body);
lower_gimple_bind (&i, &data);
i = gsi_last (lowered_body);
/* If the function falls off the end, we need a null return statement.
If we've already got one in the return_statements vector, we don't
need to do anything special. Otherwise build one by hand. */
if (gimple_seq_may_fallthru (lowered_body)
&& (data.return_statements.is_empty ()
|| (gimple_return_retval (data.return_statements.last().stmt)
!= NULL)))
{
x = gimple_build_return (NULL);
gimple_set_location (x, cfun->function_end_locus);
gimple_set_block (x, DECL_INITIAL (current_function_decl));
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
}
/* If we lowered any return statements, emit the representative
at the end of the function. */
while (!data.return_statements.is_empty ())
{
return_statements_t t = data.return_statements.pop ();
x = gimple_build_label (t.label);
gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
}
/* Once the old body has been lowered, replace it with the new
lowered sequence. */
gimple_set_body (current_function_decl, lowered_body);
gcc_assert (data.block == DECL_INITIAL (current_function_decl));
BLOCK_SUBBLOCKS (data.block)
= blocks_nreverse (BLOCK_SUBBLOCKS (data.block));
clear_block_marks (data.block);
data.return_statements.release ();
return 0;
}
static void
lower_stmt (gimple_stmt_iterator *gsi, struct lower_data *data)
{
gimple *stmt = gsi_stmt (*gsi);
gimple_set_block (stmt, data->block);
switch (gimple_code (stmt))
{
case GIMPLE_BIND:
lower_gimple_bind (gsi, data);
/* Propagate fallthruness. */
return;
case GIMPLE_COND:
case GIMPLE_GOTO:
case GIMPLE_SWITCH:
data->cannot_fallthru = true;
gsi_next (gsi);
return;
case GIMPLE_RETURN:
if (data->cannot_fallthru)
{
gsi_remove (gsi, false);
/* Propagate fallthruness. */
}
else
{
lower_gimple_return (gsi, data);
data->cannot_fallthru = true;
}
return;
case GIMPLE_TRY:
if (gimple_try_kind (stmt) == GIMPLE_TRY_CATCH)
lower_try_catch (gsi, data);
else
{
/* It must be a GIMPLE_TRY_FINALLY. */
bool cannot_fallthru;
lower_sequence (gimple_try_eval_ptr (stmt), data);
cannot_fallthru = data->cannot_fallthru;
/* The finally clause is always executed after the try clause,
so if it does not fall through, then the try-finally will not
fall through. Otherwise, if the try clause does not fall
through, then when the finally clause falls through it will
resume execution wherever the try clause was going. So the
whole try-finally will only fall through if both the try
clause and the finally clause fall through. */
data->cannot_fallthru = false;
lower_sequence (gimple_try_cleanup_ptr (stmt), data);
data->cannot_fallthru |= cannot_fallthru;
gsi_next (gsi);
}
return;
case GIMPLE_EH_ELSE:
{
geh_else *eh_else_stmt = as_a <geh_else *> (stmt);
lower_sequence (gimple_eh_else_n_body_ptr (eh_else_stmt), data);
lower_sequence (gimple_eh_else_e_body_ptr (eh_else_stmt), data);
}
break;
case GIMPLE_DEBUG:
gcc_checking_assert (cfun->debug_nonbind_markers);
/* We can't possibly have debug bind stmts before lowering, we
first emit them when entering SSA. */
gcc_checking_assert (gimple_debug_nonbind_marker_p (stmt));
/* Propagate fallthruness. */
/* If the function (e.g. from PCH) had debug stmts, but they're
disabled for this compilation, remove them. */
if (!MAY_HAVE_DEBUG_MARKER_STMTS)
gsi_remove (gsi, true);
else
gsi_next (gsi);
return;
case GIMPLE_NOP:
case GIMPLE_ASM:
case GIMPLE_ASSIGN:
case GIMPLE_PREDICT:
case GIMPLE_LABEL:
case GIMPLE_EH_MUST_NOT_THROW:
case GIMPLE_OMP_FOR:
case GIMPLE_OMP_SECTIONS:
case GIMPLE_OMP_SECTIONS_SWITCH:
case GIMPLE_OMP_SECTION:
case GIMPLE_OMP_SINGLE:
case GIMPLE_OMP_MASTER:
case GIMPLE_OMP_TASKGROUP:
case GIMPLE_OMP_ORDERED:
case GIMPLE_OMP_CRITICAL:
case GIMPLE_OMP_RETURN:
case GIMPLE_OMP_ATOMIC_LOAD:
case GIMPLE_OMP_ATOMIC_STORE:
case GIMPLE_OMP_CONTINUE:
break;
case GIMPLE_CALL:
{
tree decl = gimple_call_fndecl (stmt);
unsigned i;
for (i = 0; i < gimple_call_num_args (stmt); i++)
{
tree arg = gimple_call_arg (stmt, i);
if (EXPR_P (arg))
TREE_SET_BLOCK (arg, data->block);
}
if (decl
&& DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
{
if (DECL_FUNCTION_CODE (decl) == BUILT_IN_SETJMP)
{
lower_builtin_setjmp (gsi);
data->cannot_fallthru = false;
return;
}
else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_POSIX_MEMALIGN
&& flag_tree_bit_ccp
&& gimple_builtin_call_types_compatible_p (stmt, decl))
{
lower_builtin_posix_memalign (gsi);
return;
}
}
if (decl && (flags_from_decl_or_type (decl) & ECF_NORETURN))
{
data->cannot_fallthru = true;
gsi_next (gsi);
return;
}
}
break;
case GIMPLE_OMP_PARALLEL:
case GIMPLE_OMP_TASK:
case GIMPLE_OMP_TARGET:
case GIMPLE_OMP_TEAMS:
case GIMPLE_OMP_GRID_BODY:
data->cannot_fallthru = false;
lower_omp_directive (gsi, data);
data->cannot_fallthru = false;
return;
case GIMPLE_TRANSACTION:
lower_sequence (gimple_transaction_body_ptr (
as_a <gtransaction *> (stmt)),
data);
break;
default:
gcc_unreachable ();
}
data->cannot_fallthru = false;
gsi_next (gsi);
}