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194 lines
6.1 KiB
194 lines
6.1 KiB
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Kevin Buettner <kevinb@redhat.com>
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Date: Mon, 24 May 2021 22:30:32 -0700
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Subject: gdb-rhbz1964167-fortran-array-strides-in-expressions.patch
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;; [fortran] Backport Andrew Burgess's commit which adds support
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;; for array strides in expressions.
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gdb/fortran: add support for parsing array strides in expressions
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With this commit GDB now understands the syntax of Fortran array
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strides, a user can type an expression including an array stride, but
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they will only get an error informing them that array strides are not
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supported.
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This alone is an improvement on what we had before in GDB, better to
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give the user a helpful message that a particular feature is not
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supported than to just claim a syntax error.
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Before:
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(gdb) p array (1:10:2, 2:10:2)
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A syntax error in expression, near `:2, 2:10:2)'.
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Now:
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(gdb) p array (1:10:2, 2:10:2)
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Fortran array strides are not currently supported
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Later commits will allow GDB to handle array strides correctly.
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gdb/ChangeLog:
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* expprint.c (dump_subexp_body_standard): Print RANGE_HAS_STRIDE.
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* expression.h (enum range_type): Add RANGE_HAS_STRIDE.
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* f-exp.y (arglist): Allow for a series of subranges.
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(subrange): Add cases for subranges with strides.
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* f-lang.c (value_f90_subarray): Catch use of array strides and
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throw an error.
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* parse.c (operator_length_standard): Handle RANGE_HAS_STRIDE.
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gdb/testsuite/ChangeLog:
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* gdb.fortran/array-slices.exp: Add a new test.
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diff --git a/gdb/expprint.c b/gdb/expprint.c
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--- a/gdb/expprint.c
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+++ b/gdb/expprint.c
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@@ -1118,12 +1118,16 @@ dump_subexp_body_standard (struct expression *exp,
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fputs_filtered ("..", stream);
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if (!(range_flag & RANGE_HIGH_BOUND_DEFAULT))
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fputs_filtered ("EXP", stream);
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+ if (range_flag & RANGE_HAS_STRIDE)
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+ fputs_filtered (":EXP", stream);
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fputs_filtered ("'", stream);
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if (!(range_flag & RANGE_LOW_BOUND_DEFAULT))
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elt = dump_subexp (exp, stream, elt);
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if (!(range_flag & RANGE_HIGH_BOUND_DEFAULT))
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elt = dump_subexp (exp, stream, elt);
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+ if (range_flag & RANGE_HAS_STRIDE)
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+ elt = dump_subexp (exp, stream, elt);
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}
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break;
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diff --git a/gdb/expression.h b/gdb/expression.h
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--- a/gdb/expression.h
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+++ b/gdb/expression.h
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@@ -199,6 +199,9 @@ enum range_flag : unsigned
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/* The high bound of this range is exclusive. */
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RANGE_HIGH_BOUND_EXCLUSIVE = 1 << 2,
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+
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+ /* The range has a stride. */
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+ RANGE_HAS_STRIDE = 1 << 3,
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};
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DEF_ENUM_FLAGS_TYPE (enum range_flag, range_flags);
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diff --git a/gdb/f-exp.y b/gdb/f-exp.y
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--- a/gdb/f-exp.y
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+++ b/gdb/f-exp.y
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@@ -284,6 +284,10 @@ arglist : arglist ',' exp %prec ABOVE_COMMA
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{ pstate->arglist_len++; }
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;
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+arglist : arglist ',' subrange %prec ABOVE_COMMA
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+ { pstate->arglist_len++; }
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+ ;
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+
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/* There are four sorts of subrange types in F90. */
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subrange: exp ':' exp %prec ABOVE_COMMA
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@@ -314,6 +318,38 @@ subrange: ':' %prec ABOVE_COMMA
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write_exp_elt_opcode (pstate, OP_RANGE); }
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;
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+/* And each of the four subrange types can also have a stride. */
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+subrange: exp ':' exp ':' exp %prec ABOVE_COMMA
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+ { write_exp_elt_opcode (pstate, OP_RANGE);
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+ write_exp_elt_longcst (pstate, RANGE_HAS_STRIDE);
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+ write_exp_elt_opcode (pstate, OP_RANGE); }
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+ ;
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+
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+subrange: exp ':' ':' exp %prec ABOVE_COMMA
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+ { write_exp_elt_opcode (pstate, OP_RANGE);
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+ write_exp_elt_longcst (pstate,
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+ (RANGE_HIGH_BOUND_DEFAULT
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+ | RANGE_HAS_STRIDE));
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+ write_exp_elt_opcode (pstate, OP_RANGE); }
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+ ;
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+
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+subrange: ':' exp ':' exp %prec ABOVE_COMMA
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+ { write_exp_elt_opcode (pstate, OP_RANGE);
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+ write_exp_elt_longcst (pstate,
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+ (RANGE_LOW_BOUND_DEFAULT
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+ | RANGE_HAS_STRIDE));
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+ write_exp_elt_opcode (pstate, OP_RANGE); }
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+ ;
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+
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+subrange: ':' ':' exp %prec ABOVE_COMMA
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+ { write_exp_elt_opcode (pstate, OP_RANGE);
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+ write_exp_elt_longcst (pstate,
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+ (RANGE_LOW_BOUND_DEFAULT
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+ | RANGE_HIGH_BOUND_DEFAULT
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+ | RANGE_HAS_STRIDE));
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+ write_exp_elt_opcode (pstate, OP_RANGE); }
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+ ;
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+
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complexnum: exp ',' exp
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{ }
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;
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diff --git a/gdb/f-lang.c b/gdb/f-lang.c
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--- a/gdb/f-lang.c
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+++ b/gdb/f-lang.c
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@@ -124,7 +124,7 @@ value_f90_subarray (struct value *array,
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struct expression *exp, int *pos, enum noside noside)
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{
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int pc = (*pos) + 1;
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- LONGEST low_bound, high_bound;
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+ LONGEST low_bound, high_bound, stride;
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struct type *range = check_typedef (value_type (array)->index_type ());
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enum range_flag range_flag
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= (enum range_flag) longest_to_int (exp->elts[pc].longconst);
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@@ -141,6 +141,14 @@ value_f90_subarray (struct value *array,
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else
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high_bound = value_as_long (evaluate_subexp (nullptr, exp, pos, noside));
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+ if (range_flag & RANGE_HAS_STRIDE)
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+ stride = value_as_long (evaluate_subexp (nullptr, exp, pos, noside));
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+ else
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+ stride = 1;
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+
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+ if (stride != 1)
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+ error (_("Fortran array strides are not currently supported"));
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+
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return value_slice (array, low_bound, high_bound - low_bound + 1);
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}
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diff --git a/gdb/parse.c b/gdb/parse.c
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--- a/gdb/parse.c
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+++ b/gdb/parse.c
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@@ -924,6 +924,8 @@ operator_length_standard (const struct expression *expr, int endpos,
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/* Assume the range has 2 arguments (low bound and high bound), then
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reduce the argument count if any bounds are set to default. */
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args = 2;
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+ if (range_flag & RANGE_HAS_STRIDE)
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+ ++args;
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if (range_flag & RANGE_LOW_BOUND_DEFAULT)
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--args;
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if (range_flag & RANGE_HIGH_BOUND_DEFAULT)
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diff --git a/gdb/testsuite/gdb.fortran/array-slices.exp b/gdb/testsuite/gdb.fortran/array-slices.exp
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--- a/gdb/testsuite/gdb.fortran/array-slices.exp
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+++ b/gdb/testsuite/gdb.fortran/array-slices.exp
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@@ -66,3 +66,19 @@ foreach result $array_contents msg $message_strings {
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}
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gdb_continue_to_breakpoint "continue to Final Breakpoint"
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+
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+# Next test that asking for an array with stride at the CLI gives an
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+# error.
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+clean_restart ${testfile}
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+
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+if ![fortran_runto_main] then {
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+ perror "couldn't run to main"
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+ continue
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+}
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+
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+gdb_breakpoint "show"
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+gdb_continue_to_breakpoint "show"
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+gdb_test "up" ".*"
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+gdb_test "p array (1:10:2, 1:10:2)" \
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+ "Fortran array strides are not currently supported" \
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+ "using array stride gives an error"
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