/* Convert language-specific tree expression to rtl instructions,
for GNU compiler.
- Copyright (C) 1988, 1992, 1993 Free Software Foundation, Inc.
+ Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 2000 Free Software Foundation, Inc.
This file is part of GNU CC.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#include "config.h"
+#include "system.h"
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "expr.h"
#include "cp-tree.h"
+#include "toplev.h"
+#include "except.h"
+#include "tm_p.h"
-#undef NULL
-#define NULL 0
+static rtx cplus_expand_expr PARAMS ((tree, rtx, enum machine_mode,
+ enum expand_modifier));
+
+/* Hook used by output_constant to expand language-specific
+ constants. */
+
+tree
+cplus_expand_constant (cst)
+ tree cst;
+{
+ switch (TREE_CODE (cst))
+ {
+ case PTRMEM_CST:
+ {
+ tree type = TREE_TYPE (cst);
+ tree member;
+
+ /* Find the member. */
+ member = PTRMEM_CST_MEMBER (cst);
+
+ if (TREE_CODE (member) == FIELD_DECL)
+ {
+ /* Find the offset for the field. */
+ tree offset = byte_position (member);
+
+ if (flag_new_abi)
+ /* Under the new ABI, we use -1 to represent the NULL
+ pointer; non-NULL values simply contain the offset of
+ the data member. */
+ ;
+ else
+ /* We offset all pointer to data members by 1 so that we
+ can distinguish between a null pointer to data member
+ and the first data member of a structure. */
+ offset = size_binop (PLUS_EXPR, offset, size_one_node);
+
+ cst = fold (build1 (NOP_EXPR, type, offset));
+ }
+ else
+ {
+ tree delta, idx, pfn, delta2;
+
+ expand_ptrmemfunc_cst (cst, &delta, &idx, &pfn, &delta2);
+ cst = build_ptrmemfunc1 (type, delta, idx, pfn, delta2);
+ }
+ }
+ break;
+
+ default:
+ /* There's nothing to do. */
+ break;
+ }
+
+ return cst;
+}
/* Hook used by expand_expr to expand language-specific tree codes. */
-rtx
+static rtx
cplus_expand_expr (exp, target, tmode, modifier)
tree exp;
rtx target;
tree type = TREE_TYPE (exp);
register enum machine_mode mode = TYPE_MODE (type);
register enum tree_code code = TREE_CODE (exp);
- rtx original_target = target;
int ignore = target == const0_rtx;
if (ignore)
- target = 0, original_target = 0;
+ target = 0;
/* No sense saving up arithmetic to be done
if it's all in the wrong mode to form part of an address.
switch (code)
{
- case NEW_EXPR:
- {
- /* Something needs to be initialized, but we didn't know
- where that thing was when building the tree. For example,
- it could be the return value of a function, or a parameter
- to a function which lays down in the stack, or a temporary
- variable which must be passed by reference.
-
- Cleanups are handled in a language-specific way: they
- might be run by the called function (true in GNU C++
- for parameters with cleanups), or they might be
- run by the caller, after the call (true in GNU C++
- for other cleanup needs). */
-
- tree func = TREE_OPERAND (exp, 0);
- tree args = TREE_OPERAND (exp, 1);
- tree type = TREE_TYPE (exp), slot;
- tree fn_type = TREE_TYPE (TREE_TYPE (func));
- tree return_type = TREE_TYPE (fn_type);
- tree call_exp;
- rtx call_target, return_target;
- int pcc_struct_return = 0;
-
- /* The expression `init' wants to initialize what
- `target' represents. SLOT holds the slot for TARGET. */
- slot = TREE_OPERAND (exp, 2);
-
- if (target == 0)
- {
- /* Should always be called with a target in BLKmode case. */
- my_friendly_assert (mode != BLKmode, 205);
- my_friendly_assert (DECL_RTL (slot) != 0, 206);
-
- target = gen_reg_rtx (mode);
- }
-
- /* The target the initializer will initialize (CALL_TARGET)
- must now be directed to initialize the target we are
- supposed to initialize (TARGET). The semantics for
- choosing what CALL_TARGET is is language-specific,
- as is building the call which will perform the
- initialization. It is left here to show the choices that
- exist for C++. */
-
- if (TREE_CODE (func) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (func, 0)) == FUNCTION_DECL
- && DECL_CONSTRUCTOR_P (TREE_OPERAND (func, 0)))
- {
- type = TYPE_POINTER_TO (type);
- /* Don't clobber a value that might be part of a default
- parameter value. */
- if (TREE_PERMANENT (args))
- args = tree_cons (0, build1 (ADDR_EXPR, type, slot),
- TREE_CHAIN (args));
- else
- TREE_VALUE (args) = build1 (ADDR_EXPR, type, slot);
- call_target = 0;
- }
- else if (TREE_CODE (return_type) == REFERENCE_TYPE)
- {
- type = return_type;
- call_target = 0;
- }
- else
- {
-#ifdef PCC_STATIC_STRUCT_RETURN
- pcc_struct_return = 1;
- call_target = 0;
-#else
- call_target = target;
-#endif
- }
- if (call_target)
- {
- preserve_temp_slots (call_target);
-
- /* Make this a valid memory address now. The code below assumes
- that it can compare rtx and make assumptions based on the
- result. The assumptions are true only if the address was
- valid to begin with. */
- call_target = validize_mem (call_target);
- }
-
- preserve_temp_slots (DECL_RTL (slot));
- call_exp = build (CALL_EXPR, type, func, args, 0);
- TREE_SIDE_EFFECTS (call_exp) = 1;
- return_target = expand_expr (call_exp, call_target, mode, 0);
- free_temp_slots ();
- if (call_target == 0)
- {
- if (pcc_struct_return)
- {
- tree init = build (RTL_EXPR, type, 0, return_target);
- TREE_ADDRESSABLE (init) = 1;
- expand_aggr_init (slot, init, 0);
- if (TYPE_NEEDS_DESTRUCTOR (type))
- {
- init = build (RTL_EXPR, build_reference_type (type), 0,
- XEXP (return_target, 0));
- init = maybe_build_cleanup (convert_from_reference (init));
- if (init != NULL_TREE)
- expand_expr (init, 0, 0, 0);
- }
- call_target = return_target = DECL_RTL (slot);
- }
- else
- call_target = return_target;
- }
-
- if (call_target != return_target)
- {
- my_friendly_assert (! TYPE_NEEDS_CONSTRUCTING (type), 317);
- if (GET_MODE (return_target) == BLKmode)
- emit_block_move (call_target, return_target, expr_size (exp),
- TYPE_ALIGN (type) / BITS_PER_UNIT);
- else
- emit_move_insn (call_target, return_target);
- }
-
- if (TREE_CODE (return_type) == REFERENCE_TYPE)
- {
- tree init;
-
- if (GET_CODE (call_target) == REG
- && REGNO (call_target) < FIRST_PSEUDO_REGISTER)
- my_friendly_abort (39);
-
- type = TREE_TYPE (exp);
-
- init = build (RTL_EXPR, return_type, 0, call_target);
- /* We got back a reference to the type we want. Now initialize
- target with that. */
- expand_aggr_init (slot, init, 0);
- }
-
- if (DECL_RTL (slot) != target)
- emit_move_insn (DECL_RTL (slot), target);
- return DECL_RTL (slot);
- }
+ case PTRMEM_CST:
+ return expand_expr (cplus_expand_constant (exp),
+ target, tmode, modifier);
case OFFSET_REF:
{
-#if 1
return expand_expr (default_conversion (resolve_offset_ref (exp)),
target, tmode, EXPAND_NORMAL);
-#else
- /* This is old crusty code, and does not handle all that the
- resolve_offset_ref function does. (mrs) */
- tree base = build_unary_op (ADDR_EXPR, TREE_OPERAND (exp, 0), 0);
- tree offset = build_unary_op (ADDR_EXPR, TREE_OPERAND (exp, 1), 0);
- return expand_expr (build (PLUS_EXPR, TREE_TYPE (exp), base, offset),
- target, tmode, EXPAND_NORMAL);
-#endif
}
+ case THROW_EXPR:
+ expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
+ expand_internal_throw ();
+ return NULL;
+
+ case EMPTY_CLASS_EXPR:
+ /* We don't need to generate any code for an empty class. */
+ return const0_rtx;
+
default:
- break;
+ return c_expand_expr (exp, target, tmode, modifier);
}
my_friendly_abort (40);
/* NOTREACHED */
init_cplus_expand ()
{
lang_expand_expr = cplus_expand_expr;
+ lang_expand_constant = cplus_expand_constant;
}
-/* If DECL had its rtl moved from where callers expect it
- to be, fix it up. RESULT is the nominal rtl for the RESULT_DECL,
- which may be a pseudo instead of a hard register. */
-
-void
-fixup_result_decl (decl, result)
- tree decl;
- rtx result;
-{
- if (REG_P (result))
- {
- if (REGNO (result) >= FIRST_PSEUDO_REGISTER)
- {
- rtx real_decl_result;
-
-#ifdef FUNCTION_OUTGOING_VALUE
- real_decl_result
- = FUNCTION_OUTGOING_VALUE (TREE_TYPE (decl), current_function_decl);
-#else
- real_decl_result
- = FUNCTION_VALUE (TREE_TYPE (decl), current_function_decl);
-#endif
- REG_FUNCTION_VALUE_P (real_decl_result) = 1;
- result = real_decl_result;
- }
- emit_move_insn (result, DECL_RTL (decl));
- emit_insn (gen_rtx (USE, VOIDmode, result));
- }
-}
-
-/* Return nonzero iff DECL is memory-based. The DECL_RTL of
- certain const variables might be a CONST_INT, or a REG
- in some cases. We cannot use `memory_operand' as a test
- here because on most RISC machines, a variable's address
- is not, by itself, a legitimate address. */
int
-decl_in_memory_p (decl)
- tree decl;
+extract_init (decl, init)
+ tree decl ATTRIBUTE_UNUSED, init ATTRIBUTE_UNUSED;
{
- return DECL_RTL (decl) != 0 && GET_CODE (DECL_RTL (decl)) == MEM;
+ return 0;
}
+
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