/* Code translation -- generate GCC trees from gfc_code.
- Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
- Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 Free Software
+ Foundation, Inc.
Contributed by Paul Brook
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "toplev.h"
#include "defaults.h"
#include "real.h"
+#include "flags.h"
#include "gfortran.h"
#include "trans.h"
#include "trans-stmt.h"
tree
gfc_create_var_np (tree type, const char *prefix)
{
- return create_tmp_var_raw (type, prefix);
+ tree t;
+
+ t = create_tmp_var_raw (type, prefix);
+
+ /* No warnings for anonymous variables. */
+ if (prefix == NULL)
+ TREE_NO_WARNING (t) = 1;
+
+ return t;
}
&& TREE_CODE (base_type) == ARRAY_TYPE
&& TYPE_MAIN_VARIANT (TREE_TYPE (type))
== TYPE_MAIN_VARIANT (TREE_TYPE (base_type)))
- natural_type = type;
+ {
+ tree min_val = size_zero_node;
+ tree type_domain = TYPE_DOMAIN (base_type);
+ if (type_domain && TYPE_MIN_VALUE (type_domain))
+ min_val = TYPE_MIN_VALUE (type_domain);
+ t = build4 (ARRAY_REF, TREE_TYPE (type), t, min_val,
+ NULL_TREE, NULL_TREE);
+ natural_type = type;
+ }
else
natural_type = build_pointer_type (base_type);
/* Generate a runtime error if COND is true. */
void
-gfc_trans_runtime_check (tree cond, const char * msgid, stmtblock_t * pblock,
- locus * where)
+gfc_trans_runtime_check (tree cond, stmtblock_t * pblock, locus * where,
+ const char * msgid, ...)
{
+ va_list ap;
stmtblock_t block;
tree body;
tree tmp;
- tree arg;
- char * message;
- int line;
+ tree arg, arg2;
+ tree *argarray;
+ tree fntype;
+ char *message;
+ const char *p;
+ int line, nargs, i;
if (integer_zerop (cond))
return;
+ /* Compute the number of extra arguments from the format string. */
+ for (p = msgid, nargs = 0; *p; p++)
+ if (*p == '%')
+ {
+ p++;
+ if (*p != '%')
+ nargs++;
+ }
+
/* The code to generate the error. */
gfc_start_block (&block);
#else
line = where->lb->linenum;
#endif
- asprintf (&message, "%s (in file '%s', at line %d)", _(msgid),
- where->lb->file->filename, line);
+ asprintf (&message, "At line %d of file %s", line,
+ where->lb->file->filename);
}
else
- asprintf (&message, "%s (in file '%s', around line %d)", _(msgid),
+ asprintf (&message, "In file '%s', around line %d",
gfc_source_file, input_line + 1);
arg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const(message));
gfc_free(message);
+
+ asprintf (&message, "%s", _(msgid));
+ arg2 = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const(message));
+ gfc_free(message);
- tmp = build_call_expr (gfor_fndecl_runtime_error, 1, arg);
+ /* Build the argument array. */
+ argarray = (tree *) alloca (sizeof (tree) * (nargs + 2));
+ argarray[0] = arg;
+ argarray[1] = arg2;
+ va_start (ap, msgid);
+ for (i = 0; i < nargs; i++)
+ argarray[2+i] = va_arg (ap, tree);
+ va_end (ap);
+
+ /* Build the function call to runtime_error_at; because of the variable
+ number of arguments, we can't use build_call_expr directly. */
+ fntype = TREE_TYPE (gfor_fndecl_runtime_error_at);
+ tmp = fold_builtin_call_array (TREE_TYPE (fntype),
+ build1 (ADDR_EXPR,
+ build_pointer_type (fntype),
+ gfor_fndecl_runtime_error_at),
+ nargs + 2, argarray);
gfc_add_expr_to_block (&block, tmp);
body = gfc_finish_block (&block);
}
+/* Call malloc to allocate size bytes of memory, with special conditions:
+ + if size < 0, generate a runtime error,
+ + if size == 0, return a NULL pointer,
+ + if malloc returns NULL, issue a runtime error. */
+tree
+gfc_call_malloc (stmtblock_t * block, tree type, tree size)
+{
+ tree tmp, msg, negative, zero, malloc_result, null_result, res;
+ stmtblock_t block2;
+
+ size = gfc_evaluate_now (size, block);
+
+ if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+ size = fold_convert (size_type_node, size);
+
+ /* Create a variable to hold the result. */
+ res = gfc_create_var (pvoid_type_node, NULL);
+
+ /* size < 0 ? */
+ negative = fold_build2 (LT_EXPR, boolean_type_node, size,
+ build_int_cst (size_type_node, 0));
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Attempt to allocate a negative amount of memory."));
+ tmp = fold_build3 (COND_EXPR, void_type_node, negative,
+ build_call_expr (gfor_fndecl_runtime_error, 1, msg),
+ build_empty_stmt ());
+ gfc_add_expr_to_block (block, tmp);
+
+ /* Call malloc and check the result. */
+ gfc_start_block (&block2);
+ gfc_add_modify_expr (&block2, res,
+ build_call_expr (built_in_decls[BUILT_IN_MALLOC], 1,
+ size));
+ null_result = fold_build2 (EQ_EXPR, boolean_type_node, res,
+ build_int_cst (pvoid_type_node, 0));
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Memory allocation failed"));
+ tmp = fold_build3 (COND_EXPR, void_type_node, null_result,
+ build_call_expr (gfor_fndecl_os_error, 1, msg),
+ build_empty_stmt ());
+ gfc_add_expr_to_block (&block2, tmp);
+ malloc_result = gfc_finish_block (&block2);
+
+ /* size == 0 */
+ zero = fold_build2 (EQ_EXPR, boolean_type_node, size,
+ build_int_cst (size_type_node, 0));
+ tmp = fold_build2 (MODIFY_EXPR, pvoid_type_node, res,
+ build_int_cst (pvoid_type_node, 0));
+ tmp = fold_build3 (COND_EXPR, void_type_node, zero, tmp, malloc_result);
+ gfc_add_expr_to_block (block, tmp);
+
+ if (type != NULL)
+ res = fold_convert (type, res);
+ return res;
+}
+
+/* The status variable of allocate statement is set to ERROR_ALLOCATION
+ when the allocation wasn't successful. This value needs to be kept in
+ sync with libgfortran/libgfortran.h. */
+#define ERROR_ALLOCATION 5014
+
+/* Allocate memory, using an optional status argument.
+
+ This function follows the following pseudo-code:
+
+ void *
+ allocate (size_t size, integer_type* stat)
+ {
+ void *newmem;
+
+ if (stat)
+ *stat = 0;
+
+ // The only time this can happen is the size wraps around.
+ if (size < 0)
+ {
+ if (stat)
+ {
+ *stat = ERROR_ALLOCATION;
+ newmem = NULL;
+ }
+ else
+ runtime_error ("Attempt to allocate negative amount of memory. "
+ "Possible integer overflow");
+ }
+ else
+ {
+ newmem = malloc (MAX (size, 1));
+ if (newmem == NULL)
+ {
+ if (stat)
+ *stat = ERROR_ALLOCATION;
+ else
+ runtime_error ("Out of memory");
+ }
+ }
+
+ return newmem;
+ } */
+tree
+gfc_allocate_with_status (stmtblock_t * block, tree size, tree status)
+{
+ stmtblock_t alloc_block;
+ tree res, tmp, error, msg, cond;
+ tree status_type = status ? TREE_TYPE (TREE_TYPE (status)) : NULL_TREE;
+
+ /* Evaluate size only once, and make sure it has the right type. */
+ size = gfc_evaluate_now (size, block);
+ if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+ size = fold_convert (size_type_node, size);
+
+ /* Create a variable to hold the result. */
+ res = gfc_create_var (pvoid_type_node, NULL);
+
+ /* Set the optional status variable to zero. */
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ tmp = fold_build2 (MODIFY_EXPR, status_type,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, 0));
+ tmp = fold_build3 (COND_EXPR, void_type_node,
+ fold_build2 (NE_EXPR, boolean_type_node,
+ status, build_int_cst (status_type, 0)),
+ tmp, build_empty_stmt ());
+ gfc_add_expr_to_block (block, tmp);
+ }
+
+ /* Generate the block of code handling (size < 0). */
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Attempt to allocate negative amount of memory. "
+ "Possible integer overflow"));
+ error = build_call_expr (gfor_fndecl_runtime_error, 1, msg);
+
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ /* Set the status variable if it's present. */
+ stmtblock_t set_status_block;
+
+ gfc_start_block (&set_status_block);
+ gfc_add_modify_expr (&set_status_block,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, ERROR_ALLOCATION));
+ gfc_add_modify_expr (&set_status_block, res,
+ build_int_cst (pvoid_type_node, 0));
+
+ tmp = fold_build2 (EQ_EXPR, boolean_type_node, status,
+ build_int_cst (status_type, 0));
+ error = fold_build3 (COND_EXPR, void_type_node, tmp, error,
+ gfc_finish_block (&set_status_block));
+ }
+
+ /* The allocation itself. */
+ gfc_start_block (&alloc_block);
+ gfc_add_modify_expr (&alloc_block, res,
+ build_call_expr (built_in_decls[BUILT_IN_MALLOC], 1,
+ fold_build2 (MAX_EXPR, size_type_node,
+ size,
+ build_int_cst (size_type_node, 1))));
+
+ msg = gfc_build_addr_expr (pchar_type_node,
+ gfc_build_cstring_const ("Out of memory"));
+ tmp = build_call_expr (gfor_fndecl_os_error, 1, msg);
+
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ /* Set the status variable if it's present. */
+ tree tmp2;
+
+ cond = fold_build2 (EQ_EXPR, boolean_type_node, status,
+ build_int_cst (status_type, 0));
+ tmp2 = fold_build2 (MODIFY_EXPR, status_type,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, ERROR_ALLOCATION));
+ tmp = fold_build3 (COND_EXPR, void_type_node, cond, tmp,
+ tmp2);
+ }
+
+ tmp = fold_build3 (COND_EXPR, void_type_node,
+ fold_build2 (EQ_EXPR, boolean_type_node, res,
+ build_int_cst (pvoid_type_node, 0)),
+ tmp, build_empty_stmt ());
+ gfc_add_expr_to_block (&alloc_block, tmp);
+
+ cond = fold_build2 (LT_EXPR, boolean_type_node, size,
+ build_int_cst (TREE_TYPE (size), 0));
+ tmp = fold_build3 (COND_EXPR, void_type_node, cond, error,
+ gfc_finish_block (&alloc_block));
+ gfc_add_expr_to_block (block, tmp);
+
+ return res;
+}
+
+
+/* Generate code for an ALLOCATE statement when the argument is an
+ allocatable array. If the array is currently allocated, it is an
+ error to allocate it again.
+
+ This function follows the following pseudo-code:
+
+ void *
+ allocate_array (void *mem, size_t size, integer_type *stat)
+ {
+ if (mem == NULL)
+ return allocate (size, stat);
+ else
+ {
+ if (stat)
+ {
+ free (mem);
+ mem = allocate (size, stat);
+ *stat = ERROR_ALLOCATION;
+ return mem;
+ }
+ else
+ runtime_error ("Attempting to allocate already allocated array");
+ } */
+tree
+gfc_allocate_array_with_status (stmtblock_t * block, tree mem, tree size,
+ tree status)
+{
+ stmtblock_t alloc_block;
+ tree res, tmp, null_mem, alloc, error, msg;
+ tree type = TREE_TYPE (mem);
+
+ if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+ size = fold_convert (size_type_node, size);
+
+ /* Create a variable to hold the result. */
+ res = gfc_create_var (pvoid_type_node, NULL);
+ null_mem = fold_build2 (EQ_EXPR, boolean_type_node, mem,
+ build_int_cst (type, 0));
+
+ /* If mem is NULL, we call gfc_allocate_with_status. */
+ gfc_start_block (&alloc_block);
+ tmp = gfc_allocate_with_status (&alloc_block, size, status);
+ gfc_add_modify_expr (&alloc_block, res, fold_convert (type, tmp));
+ alloc = gfc_finish_block (&alloc_block);
+
+ /* Otherwise, we issue a runtime error or set the status variable. */
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Attempting to allocate already allocated array"));
+ error = build_call_expr (gfor_fndecl_runtime_error, 1, msg);
+
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ tree status_type = TREE_TYPE (TREE_TYPE (status));
+ stmtblock_t set_status_block;
+
+ gfc_start_block (&set_status_block);
+ tmp = build_call_expr (built_in_decls[BUILT_IN_FREE], 1,
+ fold_convert (pvoid_type_node, mem));
+ gfc_add_expr_to_block (&set_status_block, tmp);
+
+ tmp = gfc_allocate_with_status (&set_status_block, size, status);
+ gfc_add_modify_expr (&set_status_block, res, fold_convert (type, tmp));
+
+ gfc_add_modify_expr (&set_status_block,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, ERROR_ALLOCATION));
+
+ tmp = fold_build2 (EQ_EXPR, boolean_type_node, status,
+ build_int_cst (status_type, 0));
+ error = fold_build3 (COND_EXPR, void_type_node, tmp, error,
+ gfc_finish_block (&set_status_block));
+ }
+
+ tmp = fold_build3 (COND_EXPR, void_type_node, null_mem, alloc, error);
+ gfc_add_expr_to_block (block, tmp);
+
+ return res;
+}
+
+
+/* Free a given variable, if it's not NULL. */
+tree
+gfc_call_free (tree var)
+{
+ stmtblock_t block;
+ tree tmp, cond, call;
+
+ if (TREE_TYPE (var) != TREE_TYPE (pvoid_type_node))
+ var = fold_convert (pvoid_type_node, var);
+
+ gfc_start_block (&block);
+ var = gfc_evaluate_now (var, &block);
+ cond = fold_build2 (NE_EXPR, boolean_type_node, var,
+ build_int_cst (pvoid_type_node, 0));
+ call = build_call_expr (built_in_decls[BUILT_IN_FREE], 1, var);
+ tmp = fold_build3 (COND_EXPR, void_type_node, cond, call,
+ build_empty_stmt ());
+ gfc_add_expr_to_block (&block, tmp);
+
+ return gfc_finish_block (&block);
+}
+
+
+
+/* User-deallocate; we emit the code directly from the front-end, and the
+ logic is the same as the previous library function:
+
+ void
+ deallocate (void *pointer, GFC_INTEGER_4 * stat)
+ {
+ if (!pointer)
+ {
+ if (stat)
+ *stat = 1;
+ else
+ runtime_error ("Attempt to DEALLOCATE unallocated memory.");
+ }
+ else
+ {
+ free (pointer);
+ if (stat)
+ *stat = 0;
+ }
+ }
+
+ In this front-end version, status doesn't have to be GFC_INTEGER_4.
+ Moreover, if CAN_FAIL is true, then we will not emit a runtime error,
+ even when no status variable is passed to us (this is used for
+ unconditional deallocation generated by the front-end at end of
+ each procedure). */
+tree
+gfc_deallocate_with_status (tree pointer, tree status, bool can_fail)
+{
+ stmtblock_t null, non_null;
+ tree cond, tmp, error, msg;
+
+ cond = fold_build2 (EQ_EXPR, boolean_type_node, pointer,
+ build_int_cst (TREE_TYPE (pointer), 0));
+
+ /* When POINTER is NULL, we set STATUS to 1 if it's present, otherwise
+ we emit a runtime error. */
+ gfc_start_block (&null);
+ if (!can_fail)
+ {
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Attempt to DEALLOCATE unallocated memory."));
+ error = build_call_expr (gfor_fndecl_runtime_error, 1, msg);
+ }
+ else
+ error = build_empty_stmt ();
+
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ tree status_type = TREE_TYPE (TREE_TYPE (status));
+ tree cond2;
+
+ cond2 = fold_build2 (NE_EXPR, boolean_type_node, status,
+ build_int_cst (TREE_TYPE (status), 0));
+ tmp = fold_build2 (MODIFY_EXPR, status_type,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, 1));
+ error = fold_build3 (COND_EXPR, void_type_node, cond2, tmp, error);
+ }
+
+ gfc_add_expr_to_block (&null, error);
+
+ /* When POINTER is not NULL, we free it. */
+ gfc_start_block (&non_null);
+ tmp = build_call_expr (built_in_decls[BUILT_IN_FREE], 1,
+ fold_convert (pvoid_type_node, pointer));
+ gfc_add_expr_to_block (&non_null, tmp);
+
+ if (status != NULL_TREE && !integer_zerop (status))
+ {
+ /* We set STATUS to zero if it is present. */
+ tree status_type = TREE_TYPE (TREE_TYPE (status));
+ tree cond2;
+
+ cond2 = fold_build2 (NE_EXPR, boolean_type_node, status,
+ build_int_cst (TREE_TYPE (status), 0));
+ tmp = fold_build2 (MODIFY_EXPR, status_type,
+ build1 (INDIRECT_REF, status_type, status),
+ build_int_cst (status_type, 0));
+ tmp = fold_build3 (COND_EXPR, void_type_node, cond2, tmp,
+ build_empty_stmt ());
+ gfc_add_expr_to_block (&non_null, tmp);
+ }
+
+ return fold_build3 (COND_EXPR, void_type_node, cond,
+ gfc_finish_block (&null), gfc_finish_block (&non_null));
+}
+
+
+/* Reallocate MEM so it has SIZE bytes of data. This behaves like the
+ following pseudo-code:
+
+void *
+internal_realloc (void *mem, size_t size)
+{
+ if (size < 0)
+ runtime_error ("Attempt to allocate a negative amount of memory.");
+ mem = realloc (mem, size);
+ if (!mem && size != 0)
+ _gfortran_os_error ("Out of memory");
+
+ if (size == 0)
+ return NULL;
+
+ return mem;
+} */
+tree
+gfc_call_realloc (stmtblock_t * block, tree mem, tree size)
+{
+ tree msg, res, negative, zero, null_result, tmp;
+ tree type = TREE_TYPE (mem);
+
+ size = gfc_evaluate_now (size, block);
+
+ if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+ size = fold_convert (size_type_node, size);
+
+ /* Create a variable to hold the result. */
+ res = gfc_create_var (type, NULL);
+
+ /* size < 0 ? */
+ negative = fold_build2 (LT_EXPR, boolean_type_node, size,
+ build_int_cst (size_type_node, 0));
+ msg = gfc_build_addr_expr (pchar_type_node, gfc_build_cstring_const
+ ("Attempt to allocate a negative amount of memory."));
+ tmp = fold_build3 (COND_EXPR, void_type_node, negative,
+ build_call_expr (gfor_fndecl_runtime_error, 1, msg),
+ build_empty_stmt ());
+ gfc_add_expr_to_block (block, tmp);
+
+ /* Call realloc and check the result. */
+ tmp = build_call_expr (built_in_decls[BUILT_IN_REALLOC], 2,
+ fold_convert (pvoid_type_node, mem), size);
+ gfc_add_modify_expr (block, res, fold_convert (type, tmp));
+ null_result = fold_build2 (EQ_EXPR, boolean_type_node, res,
+ build_int_cst (pvoid_type_node, 0));
+ zero = fold_build2 (EQ_EXPR, boolean_type_node, size,
+ build_int_cst (size_type_node, 0));
+ null_result = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, null_result,
+ zero);
+ msg = gfc_build_addr_expr (pchar_type_node,
+ gfc_build_cstring_const ("Out of memory"));
+ tmp = fold_build3 (COND_EXPR, void_type_node, null_result,
+ build_call_expr (gfor_fndecl_os_error, 1, msg),
+ build_empty_stmt ());
+ gfc_add_expr_to_block (block, tmp);
+
+ /* if (size == 0) then the result is NULL. */
+ tmp = fold_build2 (MODIFY_EXPR, type, res, build_int_cst (type, 0));
+ tmp = fold_build3 (COND_EXPR, void_type_node, zero, tmp,
+ build_empty_stmt ());
+ gfc_add_expr_to_block (block, tmp);
+
+ return res;
+}
+
/* Add a statement to a block. */
void
OSDN Git Service
