mirror of
https://sourceware.org/git/binutils-gdb.git
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b926417afa
This fixes all the straightforward -Wshadow=local warnings in gdb. A few standard approaches are used here: * Renaming an inner (or outer, but more commonly inner) variable; * Lowering a declaration to avoid a clash; * Moving a declaration into a more inner scope to avoid a clash, including the special case of moving a declaration into a loop header. I did not consider any of the changes in this patch to be particularly noteworthy, though of course they should all still be examined. gdb/ChangeLog 2018-10-04 Tom Tromey <tom@tromey.com> * ctf.c (SET_ARRAY_FIELD): Rename "u32". * p-valprint.c (pascal_val_print): Split inner "i" variable. * xtensa-tdep.c (xtensa_push_dummy_call): Declare "i" in loop header. * xstormy16-tdep.c (xstormy16_push_dummy_call): Declare "val" in more inner scope. * xcoffread.c (read_xcoff_symtab): Rename inner "symbol". * varobj.c (varobj_update): Rename inner "newobj", "type_changed". * valprint.c (generic_emit_char): Rename inner "buf". * valops.c (find_overload_match): Rename inner "temp". (value_struct_elt_for_reference): Declare "v" in more inner scope. * v850-tdep.c (v850_push_dummy_call): Rename "len". * unittests/array-view-selftests.c (run_tests): Rename inner "vec". * tui/tui-stack.c (tui_show_frame_info): Declare "i" in loop header. * tracepoint.c (merge_uploaded_trace_state_variables): Declare "tsv" in more inner scope. (print_one_static_tracepoint_marker): Rename inner "tuple_emitter". * tic6x-tdep.c (tic6x_analyze_prologue): Declare "inst" lower. (tic6x_push_dummy_call): Don't redeclare "addr". * target-float.c: Declare "dto" lower. * symtab.c (lookup_local_symbol): Rename inner "sym". (find_pc_sect_line): Rename inner "pc". * stack.c (print_frame): Don't redeclare "gdbarch". (return_command): Rename inner "gdbarch". * s390-tdep.c (s390_prologue_frame_unwind_cache): Renam inner "sp". * rust-lang.c (rust_internal_print_type): Declare "i" in loop header. * rs6000-tdep.c (ppc_process_record): Rename inner "addr". * riscv-tdep.c (riscv_push_dummy_call): Declare "info" in inner scope. * remote.c (remote_target::update_thread_list): Don't redeclare "tp". (remote_target::process_initial_stop_replies): Rename inner "thread". (remote_target::remote_parse_stop_reply): Don't redeclare "p". (remote_target::wait_as): Don't redeclare "stop_reply". (remote_target::get_thread_local_address): Rename inner "result". (remote_target::get_tib_address): Likewise.
2499 lines
75 KiB
C
2499 lines
75 KiB
C
/* Floating point routines for GDB, the GNU debugger.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbtypes.h"
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#include "floatformat.h"
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#include "target-float.h"
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/* Target floating-point operations.
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We provide multiple implementations of those operations, which differ
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by the host-side intermediate format they perform computations in.
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Those multiple implementations all derive from the following abstract
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base class, which specifies the set of operations to be implemented. */
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class target_float_ops
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{
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public:
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virtual std::string to_string (const gdb_byte *addr, const struct type *type,
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const char *format) const = 0;
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virtual bool from_string (gdb_byte *addr, const struct type *type,
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const std::string &string) const = 0;
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virtual LONGEST to_longest (const gdb_byte *addr,
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const struct type *type) const = 0;
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virtual void from_longest (gdb_byte *addr, const struct type *type,
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LONGEST val) const = 0;
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virtual void from_ulongest (gdb_byte *addr, const struct type *type,
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ULONGEST val) const = 0;
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virtual double to_host_double (const gdb_byte *addr,
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const struct type *type) const = 0;
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virtual void from_host_double (gdb_byte *addr, const struct type *type,
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double val) const = 0;
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virtual void convert (const gdb_byte *from, const struct type *from_type,
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gdb_byte *to, const struct type *to_type) const = 0;
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virtual void binop (enum exp_opcode opcode,
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const gdb_byte *x, const struct type *type_x,
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const gdb_byte *y, const struct type *type_y,
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gdb_byte *res, const struct type *type_res) const = 0;
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virtual int compare (const gdb_byte *x, const struct type *type_x,
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const gdb_byte *y, const struct type *type_y) const = 0;
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};
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/* Helper routines operating on binary floating-point data. */
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#include <cmath>
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#include <limits>
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/* Different kinds of floatformat numbers recognized by
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floatformat_classify. To avoid portability issues, we use local
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values instead of the C99 macros (FP_NAN et cetera). */
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enum float_kind {
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float_nan,
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float_infinite,
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float_zero,
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float_normal,
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float_subnormal
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};
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/* The odds that CHAR_BIT will be anything but 8 are low enough that I'm not
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going to bother with trying to muck around with whether it is defined in
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a system header, what we do if not, etc. */
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#define FLOATFORMAT_CHAR_BIT 8
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/* The number of bytes that the largest floating-point type that we
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can convert to doublest will need. */
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#define FLOATFORMAT_LARGEST_BYTES 16
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/* Return the floatformat's total size in host bytes. */
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static size_t
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floatformat_totalsize_bytes (const struct floatformat *fmt)
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{
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return ((fmt->totalsize + FLOATFORMAT_CHAR_BIT - 1)
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/ FLOATFORMAT_CHAR_BIT);
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}
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/* Return the precision of the floating point format FMT. */
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static int
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floatformat_precision (const struct floatformat *fmt)
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{
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/* Assume the precision of and IBM long double is twice the precision
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of the underlying double. This matches what GCC does. */
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if (fmt->split_half)
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return 2 * floatformat_precision (fmt->split_half);
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/* Otherwise, the precision is the size of mantissa in bits,
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including the implicit bit if present. */
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int prec = fmt->man_len;
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if (fmt->intbit == floatformat_intbit_no)
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prec++;
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return prec;
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}
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/* Normalize the byte order of FROM into TO. If no normalization is
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needed then FMT->byteorder is returned and TO is not changed;
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otherwise the format of the normalized form in TO is returned. */
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static enum floatformat_byteorders
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floatformat_normalize_byteorder (const struct floatformat *fmt,
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const void *from, void *to)
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{
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const unsigned char *swapin;
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unsigned char *swapout;
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int words;
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if (fmt->byteorder == floatformat_little
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|| fmt->byteorder == floatformat_big)
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return fmt->byteorder;
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words = fmt->totalsize / FLOATFORMAT_CHAR_BIT;
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words >>= 2;
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swapout = (unsigned char *)to;
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swapin = (const unsigned char *)from;
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if (fmt->byteorder == floatformat_vax)
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{
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while (words-- > 0)
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{
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*swapout++ = swapin[1];
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*swapout++ = swapin[0];
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*swapout++ = swapin[3];
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*swapout++ = swapin[2];
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swapin += 4;
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}
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/* This may look weird, since VAX is little-endian, but it is
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easier to translate to big-endian than to little-endian. */
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return floatformat_big;
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}
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else
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{
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gdb_assert (fmt->byteorder == floatformat_littlebyte_bigword);
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while (words-- > 0)
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{
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*swapout++ = swapin[3];
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*swapout++ = swapin[2];
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*swapout++ = swapin[1];
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*swapout++ = swapin[0];
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swapin += 4;
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}
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return floatformat_big;
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}
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}
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/* Extract a field which starts at START and is LEN bytes long. DATA and
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TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
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static unsigned long
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get_field (const bfd_byte *data, enum floatformat_byteorders order,
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unsigned int total_len, unsigned int start, unsigned int len)
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{
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unsigned long result;
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unsigned int cur_byte;
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int cur_bitshift;
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/* Caller must byte-swap words before calling this routine. */
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gdb_assert (order == floatformat_little || order == floatformat_big);
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/* Start at the least significant part of the field. */
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if (order == floatformat_little)
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{
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/* We start counting from the other end (i.e, from the high bytes
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rather than the low bytes). As such, we need to be concerned
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with what happens if bit 0 doesn't start on a byte boundary.
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I.e, we need to properly handle the case where total_len is
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not evenly divisible by 8. So we compute ``excess'' which
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represents the number of bits from the end of our starting
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byte needed to get to bit 0. */
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int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
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cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
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- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
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cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
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- FLOATFORMAT_CHAR_BIT;
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}
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else
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{
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cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
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cur_bitshift =
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((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
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}
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if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
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result = *(data + cur_byte) >> (-cur_bitshift);
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else
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result = 0;
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cur_bitshift += FLOATFORMAT_CHAR_BIT;
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if (order == floatformat_little)
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++cur_byte;
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else
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--cur_byte;
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/* Move towards the most significant part of the field. */
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while (cur_bitshift < len)
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{
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result |= (unsigned long)*(data + cur_byte) << cur_bitshift;
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cur_bitshift += FLOATFORMAT_CHAR_BIT;
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switch (order)
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{
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case floatformat_little:
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++cur_byte;
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break;
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case floatformat_big:
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--cur_byte;
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break;
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}
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}
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if (len < sizeof(result) * FLOATFORMAT_CHAR_BIT)
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/* Mask out bits which are not part of the field. */
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result &= ((1UL << len) - 1);
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return result;
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}
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/* Set a field which starts at START and is LEN bytes long. DATA and
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TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
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static void
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put_field (unsigned char *data, enum floatformat_byteorders order,
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unsigned int total_len, unsigned int start, unsigned int len,
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unsigned long stuff_to_put)
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{
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unsigned int cur_byte;
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int cur_bitshift;
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/* Caller must byte-swap words before calling this routine. */
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gdb_assert (order == floatformat_little || order == floatformat_big);
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/* Start at the least significant part of the field. */
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if (order == floatformat_little)
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{
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int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
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cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
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- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
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cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
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- FLOATFORMAT_CHAR_BIT;
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}
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else
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{
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cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
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cur_bitshift =
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((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
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}
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if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
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{
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*(data + cur_byte) &=
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~(((1 << ((start + len) % FLOATFORMAT_CHAR_BIT)) - 1)
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<< (-cur_bitshift));
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*(data + cur_byte) |=
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(stuff_to_put & ((1 << FLOATFORMAT_CHAR_BIT) - 1)) << (-cur_bitshift);
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}
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cur_bitshift += FLOATFORMAT_CHAR_BIT;
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if (order == floatformat_little)
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++cur_byte;
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else
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--cur_byte;
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/* Move towards the most significant part of the field. */
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while (cur_bitshift < len)
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{
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if (len - cur_bitshift < FLOATFORMAT_CHAR_BIT)
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{
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/* This is the last byte. */
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*(data + cur_byte) &=
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~((1 << (len - cur_bitshift)) - 1);
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*(data + cur_byte) |= (stuff_to_put >> cur_bitshift);
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}
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else
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*(data + cur_byte) = ((stuff_to_put >> cur_bitshift)
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& ((1 << FLOATFORMAT_CHAR_BIT) - 1));
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cur_bitshift += FLOATFORMAT_CHAR_BIT;
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if (order == floatformat_little)
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++cur_byte;
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else
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--cur_byte;
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}
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}
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/* Check if VAL (which is assumed to be a floating point number whose
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format is described by FMT) is negative. */
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static int
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floatformat_is_negative (const struct floatformat *fmt,
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const bfd_byte *uval)
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{
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enum floatformat_byteorders order;
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unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
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gdb_assert (fmt != NULL);
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gdb_assert (fmt->totalsize
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<= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
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/* An IBM long double (a two element array of double) always takes the
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sign of the first double. */
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if (fmt->split_half)
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fmt = fmt->split_half;
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order = floatformat_normalize_byteorder (fmt, uval, newfrom);
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if (order != fmt->byteorder)
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uval = newfrom;
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return get_field (uval, order, fmt->totalsize, fmt->sign_start, 1);
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}
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/* Check if VAL is "not a number" (NaN) for FMT. */
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static enum float_kind
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floatformat_classify (const struct floatformat *fmt,
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const bfd_byte *uval)
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{
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long exponent;
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unsigned long mant;
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unsigned int mant_bits, mant_off;
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int mant_bits_left;
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enum floatformat_byteorders order;
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unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
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int mant_zero;
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gdb_assert (fmt != NULL);
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gdb_assert (fmt->totalsize
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<= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
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/* An IBM long double (a two element array of double) can be classified
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by looking at the first double. inf and nan are specified as
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ignoring the second double. zero and subnormal will always have
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the second double 0.0 if the long double is correctly rounded. */
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if (fmt->split_half)
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fmt = fmt->split_half;
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order = floatformat_normalize_byteorder (fmt, uval, newfrom);
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if (order != fmt->byteorder)
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uval = newfrom;
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exponent = get_field (uval, order, fmt->totalsize, fmt->exp_start,
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fmt->exp_len);
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mant_bits_left = fmt->man_len;
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mant_off = fmt->man_start;
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mant_zero = 1;
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while (mant_bits_left > 0)
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{
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mant_bits = std::min (mant_bits_left, 32);
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mant = get_field (uval, order, fmt->totalsize, mant_off, mant_bits);
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/* If there is an explicit integer bit, mask it off. */
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if (mant_off == fmt->man_start
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&& fmt->intbit == floatformat_intbit_yes)
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mant &= ~(1 << (mant_bits - 1));
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if (mant)
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{
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mant_zero = 0;
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break;
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}
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mant_off += mant_bits;
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mant_bits_left -= mant_bits;
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}
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/* If exp_nan is not set, assume that inf, NaN, and subnormals are not
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supported. */
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if (! fmt->exp_nan)
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{
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if (mant_zero)
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return float_zero;
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else
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return float_normal;
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}
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if (exponent == 0)
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{
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if (mant_zero)
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return float_zero;
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else
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return float_subnormal;
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}
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if (exponent == fmt->exp_nan)
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{
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if (mant_zero)
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return float_infinite;
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else
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return float_nan;
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}
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return float_normal;
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}
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/* Convert the mantissa of VAL (which is assumed to be a floating
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point number whose format is described by FMT) into a hexadecimal
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and store it in a static string. Return a pointer to that string. */
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static const char *
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floatformat_mantissa (const struct floatformat *fmt,
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const bfd_byte *val)
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{
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unsigned char *uval = (unsigned char *) val;
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unsigned long mant;
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unsigned int mant_bits, mant_off;
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int mant_bits_left;
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static char res[50];
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char buf[9];
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int len;
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enum floatformat_byteorders order;
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unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
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gdb_assert (fmt != NULL);
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gdb_assert (fmt->totalsize
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<= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
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|
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/* For IBM long double (a two element array of double), return the
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mantissa of the first double. The problem with returning the
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actual mantissa from both doubles is that there can be an
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arbitrary number of implied 0's or 1's between the mantissas
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of the first and second double. In any case, this function
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is only used for dumping out nans, and a nan is specified to
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ignore the value in the second double. */
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if (fmt->split_half)
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fmt = fmt->split_half;
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order = floatformat_normalize_byteorder (fmt, uval, newfrom);
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if (order != fmt->byteorder)
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uval = newfrom;
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if (! fmt->exp_nan)
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return 0;
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/* Make sure we have enough room to store the mantissa. */
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gdb_assert (sizeof res > ((fmt->man_len + 7) / 8) * 2);
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mant_off = fmt->man_start;
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mant_bits_left = fmt->man_len;
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mant_bits = (mant_bits_left % 32) > 0 ? mant_bits_left % 32 : 32;
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mant = get_field (uval, order, fmt->totalsize, mant_off, mant_bits);
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len = xsnprintf (res, sizeof res, "%lx", mant);
|
|
|
|
mant_off += mant_bits;
|
|
mant_bits_left -= mant_bits;
|
|
|
|
while (mant_bits_left > 0)
|
|
{
|
|
mant = get_field (uval, order, fmt->totalsize, mant_off, 32);
|
|
|
|
xsnprintf (buf, sizeof buf, "%08lx", mant);
|
|
gdb_assert (len + strlen (buf) <= sizeof res);
|
|
strcat (res, buf);
|
|
|
|
mant_off += 32;
|
|
mant_bits_left -= 32;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/* Convert printf format string FORMAT to the otherwise equivalent string
|
|
which may be used to print a host floating-point number using the length
|
|
modifier LENGTH (which may be 0 if none is needed). If FORMAT is null,
|
|
return a format appropriate to print the full precision of a target
|
|
floating-point number of format FMT. */
|
|
static std::string
|
|
floatformat_printf_format (const struct floatformat *fmt,
|
|
const char *format, char length)
|
|
{
|
|
std::string host_format;
|
|
char conversion;
|
|
|
|
if (format == nullptr)
|
|
{
|
|
/* If no format was specified, print the number using a format string
|
|
where the precision is set to the DECIMAL_DIG value for the given
|
|
floating-point format. This value is computed as
|
|
|
|
ceil(1 + p * log10(b)),
|
|
|
|
where p is the precision of the floating-point format in bits, and
|
|
b is the base (which is always 2 for the formats we support). */
|
|
const double log10_2 = .30102999566398119521;
|
|
double d_decimal_dig = 1 + floatformat_precision (fmt) * log10_2;
|
|
int decimal_dig = d_decimal_dig;
|
|
if (decimal_dig < d_decimal_dig)
|
|
decimal_dig++;
|
|
|
|
host_format = string_printf ("%%.%d", decimal_dig);
|
|
conversion = 'g';
|
|
}
|
|
else
|
|
{
|
|
/* Use the specified format, stripping out the conversion character
|
|
and length modifier, if present. */
|
|
size_t len = strlen (format);
|
|
gdb_assert (len > 1);
|
|
conversion = format[--len];
|
|
gdb_assert (conversion == 'e' || conversion == 'f' || conversion == 'g'
|
|
|| conversion == 'E' || conversion == 'G');
|
|
if (format[len - 1] == 'L')
|
|
len--;
|
|
|
|
host_format = std::string (format, len);
|
|
}
|
|
|
|
/* Add the length modifier and conversion character appropriate for
|
|
handling the appropriate host floating-point type. */
|
|
if (length)
|
|
host_format += length;
|
|
host_format += conversion;
|
|
|
|
return host_format;
|
|
}
|
|
|
|
/* Implementation of target_float_ops using the host floating-point type T
|
|
as intermediate type. */
|
|
|
|
template<typename T> class host_float_ops : public target_float_ops
|
|
{
|
|
public:
|
|
std::string to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format) const override;
|
|
bool from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &string) const override;
|
|
|
|
LONGEST to_longest (const gdb_byte *addr,
|
|
const struct type *type) const override;
|
|
void from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST val) const override;
|
|
void from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST val) const override;
|
|
double to_host_double (const gdb_byte *addr,
|
|
const struct type *type) const override;
|
|
void from_host_double (gdb_byte *addr, const struct type *type,
|
|
double val) const override;
|
|
void convert (const gdb_byte *from, const struct type *from_type,
|
|
gdb_byte *to, const struct type *to_type) const override;
|
|
|
|
void binop (enum exp_opcode opcode,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const override;
|
|
int compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const override;
|
|
|
|
private:
|
|
void from_target (const struct floatformat *fmt,
|
|
const gdb_byte *from, T *to) const;
|
|
void from_target (const struct type *type,
|
|
const gdb_byte *from, T *to) const;
|
|
|
|
void to_target (const struct type *type,
|
|
const T *from, gdb_byte *to) const;
|
|
void to_target (const struct floatformat *fmt,
|
|
const T *from, gdb_byte *to) const;
|
|
};
|
|
|
|
|
|
/* Convert TO/FROM target to the host floating-point format T.
|
|
|
|
If the host and target formats agree, we just copy the raw data
|
|
into the appropriate type of variable and return, letting the host
|
|
increase precision as necessary. Otherwise, we call the conversion
|
|
routine and let it do the dirty work. Note that even if the target
|
|
and host floating-point formats match, the length of the types
|
|
might still be different, so the conversion routines must make sure
|
|
to not overrun any buffers. For example, on x86, long double is
|
|
the 80-bit extended precision type on both 32-bit and 64-bit ABIs,
|
|
but by default it is stored as 12 bytes on 32-bit, and 16 bytes on
|
|
64-bit, for alignment reasons. See comment in store_typed_floating
|
|
for a discussion about zeroing out remaining bytes in the target
|
|
buffer. */
|
|
|
|
static const struct floatformat *host_float_format = GDB_HOST_FLOAT_FORMAT;
|
|
static const struct floatformat *host_double_format = GDB_HOST_DOUBLE_FORMAT;
|
|
static const struct floatformat *host_long_double_format
|
|
= GDB_HOST_LONG_DOUBLE_FORMAT;
|
|
|
|
/* Convert target floating-point value at FROM in format FMT to host
|
|
floating-point format of type T. */
|
|
template<typename T> void
|
|
host_float_ops<T>::from_target (const struct floatformat *fmt,
|
|
const gdb_byte *from, T *to) const
|
|
{
|
|
gdb_assert (fmt != NULL);
|
|
|
|
if (fmt == host_float_format)
|
|
{
|
|
float val = 0;
|
|
|
|
memcpy (&val, from, floatformat_totalsize_bytes (fmt));
|
|
*to = val;
|
|
return;
|
|
}
|
|
else if (fmt == host_double_format)
|
|
{
|
|
double val = 0;
|
|
|
|
memcpy (&val, from, floatformat_totalsize_bytes (fmt));
|
|
*to = val;
|
|
return;
|
|
}
|
|
else if (fmt == host_long_double_format)
|
|
{
|
|
long double val = 0;
|
|
|
|
memcpy (&val, from, floatformat_totalsize_bytes (fmt));
|
|
*to = val;
|
|
return;
|
|
}
|
|
|
|
unsigned char *ufrom = (unsigned char *) from;
|
|
long exponent;
|
|
unsigned long mant;
|
|
unsigned int mant_bits, mant_off;
|
|
int mant_bits_left;
|
|
int special_exponent; /* It's a NaN, denorm or zero. */
|
|
enum floatformat_byteorders order;
|
|
unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
|
|
enum float_kind kind;
|
|
|
|
gdb_assert (fmt->totalsize
|
|
<= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
|
|
|
|
/* For non-numbers, reuse libiberty's logic to find the correct
|
|
format. We do not lose any precision in this case by passing
|
|
through a double. */
|
|
kind = floatformat_classify (fmt, (const bfd_byte *) from);
|
|
if (kind == float_infinite || kind == float_nan)
|
|
{
|
|
double dto;
|
|
|
|
floatformat_to_double (fmt->split_half ? fmt->split_half : fmt,
|
|
from, &dto);
|
|
*to = (T) dto;
|
|
return;
|
|
}
|
|
|
|
order = floatformat_normalize_byteorder (fmt, ufrom, newfrom);
|
|
|
|
if (order != fmt->byteorder)
|
|
ufrom = newfrom;
|
|
|
|
if (fmt->split_half)
|
|
{
|
|
T dtop, dbot;
|
|
|
|
from_target (fmt->split_half, ufrom, &dtop);
|
|
/* Preserve the sign of 0, which is the sign of the top
|
|
half. */
|
|
if (dtop == 0.0)
|
|
{
|
|
*to = dtop;
|
|
return;
|
|
}
|
|
from_target (fmt->split_half,
|
|
ufrom + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2, &dbot);
|
|
*to = dtop + dbot;
|
|
return;
|
|
}
|
|
|
|
exponent = get_field (ufrom, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len);
|
|
/* Note that if exponent indicates a NaN, we can't really do anything useful
|
|
(not knowing if the host has NaN's, or how to build one). So it will
|
|
end up as an infinity or something close; that is OK. */
|
|
|
|
mant_bits_left = fmt->man_len;
|
|
mant_off = fmt->man_start;
|
|
T dto = 0.0;
|
|
|
|
special_exponent = exponent == 0 || exponent == fmt->exp_nan;
|
|
|
|
/* Don't bias NaNs. Use minimum exponent for denorms. For
|
|
simplicity, we don't check for zero as the exponent doesn't matter.
|
|
Note the cast to int; exp_bias is unsigned, so it's important to
|
|
make sure the operation is done in signed arithmetic. */
|
|
if (!special_exponent)
|
|
exponent -= fmt->exp_bias;
|
|
else if (exponent == 0)
|
|
exponent = 1 - fmt->exp_bias;
|
|
|
|
/* Build the result algebraically. Might go infinite, underflow, etc;
|
|
who cares. */
|
|
|
|
/* If this format uses a hidden bit, explicitly add it in now. Otherwise,
|
|
increment the exponent by one to account for the integer bit. */
|
|
|
|
if (!special_exponent)
|
|
{
|
|
if (fmt->intbit == floatformat_intbit_no)
|
|
dto = ldexp (1.0, exponent);
|
|
else
|
|
exponent++;
|
|
}
|
|
|
|
while (mant_bits_left > 0)
|
|
{
|
|
mant_bits = std::min (mant_bits_left, 32);
|
|
|
|
mant = get_field (ufrom, order, fmt->totalsize, mant_off, mant_bits);
|
|
|
|
dto += ldexp ((T) mant, exponent - mant_bits);
|
|
exponent -= mant_bits;
|
|
mant_off += mant_bits;
|
|
mant_bits_left -= mant_bits;
|
|
}
|
|
|
|
/* Negate it if negative. */
|
|
if (get_field (ufrom, order, fmt->totalsize, fmt->sign_start, 1))
|
|
dto = -dto;
|
|
*to = dto;
|
|
}
|
|
|
|
template<typename T> void
|
|
host_float_ops<T>::from_target (const struct type *type,
|
|
const gdb_byte *from, T *to) const
|
|
{
|
|
from_target (floatformat_from_type (type), from, to);
|
|
}
|
|
|
|
/* Convert host floating-point value of type T to target floating-point
|
|
value in format FMT and store at TO. */
|
|
template<typename T> void
|
|
host_float_ops<T>::to_target (const struct floatformat *fmt,
|
|
const T *from, gdb_byte *to) const
|
|
{
|
|
gdb_assert (fmt != NULL);
|
|
|
|
if (fmt == host_float_format)
|
|
{
|
|
float val = *from;
|
|
|
|
memcpy (to, &val, floatformat_totalsize_bytes (fmt));
|
|
return;
|
|
}
|
|
else if (fmt == host_double_format)
|
|
{
|
|
double val = *from;
|
|
|
|
memcpy (to, &val, floatformat_totalsize_bytes (fmt));
|
|
return;
|
|
}
|
|
else if (fmt == host_long_double_format)
|
|
{
|
|
long double val = *from;
|
|
|
|
memcpy (to, &val, floatformat_totalsize_bytes (fmt));
|
|
return;
|
|
}
|
|
|
|
T dfrom;
|
|
int exponent;
|
|
T mant;
|
|
unsigned int mant_bits, mant_off;
|
|
int mant_bits_left;
|
|
unsigned char *uto = (unsigned char *) to;
|
|
enum floatformat_byteorders order = fmt->byteorder;
|
|
unsigned char newto[FLOATFORMAT_LARGEST_BYTES];
|
|
|
|
if (order != floatformat_little)
|
|
order = floatformat_big;
|
|
|
|
if (order != fmt->byteorder)
|
|
uto = newto;
|
|
|
|
memcpy (&dfrom, from, sizeof (dfrom));
|
|
memset (uto, 0, floatformat_totalsize_bytes (fmt));
|
|
|
|
if (fmt->split_half)
|
|
{
|
|
/* Use static volatile to ensure that any excess precision is
|
|
removed via storing in memory, and so the top half really is
|
|
the result of converting to double. */
|
|
static volatile double dtop, dbot;
|
|
T dtopnv, dbotnv;
|
|
|
|
dtop = (double) dfrom;
|
|
/* If the rounded top half is Inf, the bottom must be 0 not NaN
|
|
or Inf. */
|
|
if (dtop + dtop == dtop && dtop != 0.0)
|
|
dbot = 0.0;
|
|
else
|
|
dbot = (double) (dfrom - (T) dtop);
|
|
dtopnv = dtop;
|
|
dbotnv = dbot;
|
|
to_target (fmt->split_half, &dtopnv, uto);
|
|
to_target (fmt->split_half, &dbotnv,
|
|
uto + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2);
|
|
return;
|
|
}
|
|
|
|
if (dfrom == 0)
|
|
goto finalize_byteorder; /* Result is zero */
|
|
if (dfrom != dfrom) /* Result is NaN */
|
|
{
|
|
/* From is NaN */
|
|
put_field (uto, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
/* Be sure it's not infinity, but NaN value is irrel. */
|
|
put_field (uto, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 1);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
/* If negative, set the sign bit. */
|
|
if (dfrom < 0)
|
|
{
|
|
put_field (uto, order, fmt->totalsize, fmt->sign_start, 1, 1);
|
|
dfrom = -dfrom;
|
|
}
|
|
|
|
if (dfrom + dfrom == dfrom && dfrom != 0.0) /* Result is Infinity. */
|
|
{
|
|
/* Infinity exponent is same as NaN's. */
|
|
put_field (uto, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
/* Infinity mantissa is all zeroes. */
|
|
put_field (uto, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
mant = frexp (dfrom, &exponent);
|
|
|
|
if (exponent + fmt->exp_bias <= 0)
|
|
{
|
|
/* The value is too small to be expressed in the destination
|
|
type (not enough bits in the exponent. Treat as 0. */
|
|
put_field (uto, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, 0);
|
|
put_field (uto, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
if (exponent + fmt->exp_bias >= (1 << fmt->exp_len))
|
|
{
|
|
/* The value is too large to fit into the destination.
|
|
Treat as infinity. */
|
|
put_field (uto, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
put_field (uto, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
put_field (uto, order, fmt->totalsize, fmt->exp_start, fmt->exp_len,
|
|
exponent + fmt->exp_bias - 1);
|
|
|
|
mant_bits_left = fmt->man_len;
|
|
mant_off = fmt->man_start;
|
|
while (mant_bits_left > 0)
|
|
{
|
|
unsigned long mant_long;
|
|
|
|
mant_bits = mant_bits_left < 32 ? mant_bits_left : 32;
|
|
|
|
mant *= 4294967296.0;
|
|
mant_long = ((unsigned long) mant) & 0xffffffffL;
|
|
mant -= mant_long;
|
|
|
|
/* If the integer bit is implicit, then we need to discard it.
|
|
If we are discarding a zero, we should be (but are not) creating
|
|
a denormalized number which means adjusting the exponent
|
|
(I think). */
|
|
if (mant_bits_left == fmt->man_len
|
|
&& fmt->intbit == floatformat_intbit_no)
|
|
{
|
|
mant_long <<= 1;
|
|
mant_long &= 0xffffffffL;
|
|
/* If we are processing the top 32 mantissa bits of a doublest
|
|
so as to convert to a float value with implied integer bit,
|
|
we will only be putting 31 of those 32 bits into the
|
|
final value due to the discarding of the top bit. In the
|
|
case of a small float value where the number of mantissa
|
|
bits is less than 32, discarding the top bit does not alter
|
|
the number of bits we will be adding to the result. */
|
|
if (mant_bits == 32)
|
|
mant_bits -= 1;
|
|
}
|
|
|
|
if (mant_bits < 32)
|
|
{
|
|
/* The bits we want are in the most significant MANT_BITS bits of
|
|
mant_long. Move them to the least significant. */
|
|
mant_long >>= 32 - mant_bits;
|
|
}
|
|
|
|
put_field (uto, order, fmt->totalsize,
|
|
mant_off, mant_bits, mant_long);
|
|
mant_off += mant_bits;
|
|
mant_bits_left -= mant_bits;
|
|
}
|
|
|
|
finalize_byteorder:
|
|
/* Do we need to byte-swap the words in the result? */
|
|
if (order != fmt->byteorder)
|
|
floatformat_normalize_byteorder (fmt, newto, to);
|
|
}
|
|
|
|
template<typename T> void
|
|
host_float_ops<T>::to_target (const struct type *type,
|
|
const T *from, gdb_byte *to) const
|
|
{
|
|
/* Ensure possible padding bytes in the target buffer are zeroed out. */
|
|
memset (to, 0, TYPE_LENGTH (type));
|
|
|
|
to_target (floatformat_from_type (type), from, to);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a string, optionally using the print format FORMAT. */
|
|
template<typename T> struct printf_length_modifier
|
|
{
|
|
static constexpr char value = 0;
|
|
};
|
|
template<> struct printf_length_modifier<long double>
|
|
{
|
|
static constexpr char value = 'L';
|
|
};
|
|
template<typename T> std::string
|
|
host_float_ops<T>::to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format) const
|
|
{
|
|
/* Determine the format string to use on the host side. */
|
|
constexpr char length = printf_length_modifier<T>::value;
|
|
const struct floatformat *fmt = floatformat_from_type (type);
|
|
std::string host_format = floatformat_printf_format (fmt, format, length);
|
|
|
|
T host_float;
|
|
from_target (type, addr, &host_float);
|
|
|
|
DIAGNOSTIC_PUSH
|
|
DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
|
|
return string_printf (host_format.c_str (), host_float);
|
|
DIAGNOSTIC_POP
|
|
}
|
|
|
|
/* Parse string IN into a target floating-number of type TYPE and
|
|
store it as byte-stream ADDR. Return whether parsing succeeded. */
|
|
template<typename T> struct scanf_length_modifier
|
|
{
|
|
static constexpr char value = 0;
|
|
};
|
|
template<> struct scanf_length_modifier<double>
|
|
{
|
|
static constexpr char value = 'l';
|
|
};
|
|
template<> struct scanf_length_modifier<long double>
|
|
{
|
|
static constexpr char value = 'L';
|
|
};
|
|
template<typename T> bool
|
|
host_float_ops<T>::from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &in) const
|
|
{
|
|
T host_float;
|
|
int n, num;
|
|
|
|
std::string scan_format = "%";
|
|
if (scanf_length_modifier<T>::value)
|
|
scan_format += scanf_length_modifier<T>::value;
|
|
scan_format += "g%n";
|
|
|
|
DIAGNOSTIC_PUSH
|
|
DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
|
|
num = sscanf (in.c_str (), scan_format.c_str(), &host_float, &n);
|
|
DIAGNOSTIC_POP
|
|
|
|
/* The sscanf man page suggests not making any assumptions on the effect
|
|
of %n on the result, so we don't.
|
|
That is why we simply test num == 0. */
|
|
if (num == 0)
|
|
return false;
|
|
|
|
/* We only accept the whole string. */
|
|
if (in[n])
|
|
return false;
|
|
|
|
to_target (type, &host_float, addr);
|
|
return true;
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to an integer value (rounding towards zero). */
|
|
template<typename T> LONGEST
|
|
host_float_ops<T>::to_longest (const gdb_byte *addr,
|
|
const struct type *type) const
|
|
{
|
|
T host_float;
|
|
from_target (type, addr, &host_float);
|
|
/* Converting an out-of-range value is undefined behavior in C, but we
|
|
prefer to return a defined value here. */
|
|
if (host_float > std::numeric_limits<LONGEST>::max())
|
|
return std::numeric_limits<LONGEST>::max();
|
|
if (host_float < std::numeric_limits<LONGEST>::min())
|
|
return std::numeric_limits<LONGEST>::min();
|
|
return (LONGEST) host_float;
|
|
}
|
|
|
|
/* Convert signed integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
template<typename T> void
|
|
host_float_ops<T>::from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST val) const
|
|
{
|
|
T host_float = (T) val;
|
|
to_target (type, &host_float, addr);
|
|
}
|
|
|
|
/* Convert unsigned integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
template<typename T> void
|
|
host_float_ops<T>::from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST val) const
|
|
{
|
|
T host_float = (T) val;
|
|
to_target (type, &host_float, addr);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a floating-point value in the host "double" format. */
|
|
template<typename T> double
|
|
host_float_ops<T>::to_host_double (const gdb_byte *addr,
|
|
const struct type *type) const
|
|
{
|
|
T host_float;
|
|
from_target (type, addr, &host_float);
|
|
return (double) host_float;
|
|
}
|
|
|
|
/* Convert floating-point value VAL in the host "double" format to a target
|
|
floating-number of type TYPE and store it as byte-stream ADDR. */
|
|
template<typename T> void
|
|
host_float_ops<T>::from_host_double (gdb_byte *addr, const struct type *type,
|
|
double val) const
|
|
{
|
|
T host_float = (T) val;
|
|
to_target (type, &host_float, addr);
|
|
}
|
|
|
|
/* Convert a floating-point number of type FROM_TYPE from the target
|
|
byte-stream FROM to a floating-point number of type TO_TYPE, and
|
|
store it to the target byte-stream TO. */
|
|
template<typename T> void
|
|
host_float_ops<T>::convert (const gdb_byte *from,
|
|
const struct type *from_type,
|
|
gdb_byte *to,
|
|
const struct type *to_type) const
|
|
{
|
|
T host_float;
|
|
from_target (from_type, from, &host_float);
|
|
to_target (to_type, &host_float, to);
|
|
}
|
|
|
|
/* Perform the binary operation indicated by OPCODE, using as operands the
|
|
target byte streams X and Y, interpreted as floating-point numbers of
|
|
types TYPE_X and TYPE_Y, respectively. Convert the result to format
|
|
TYPE_RES and store it into the byte-stream RES. */
|
|
template<typename T> void
|
|
host_float_ops<T>::binop (enum exp_opcode op,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const
|
|
{
|
|
T v1, v2, v = 0;
|
|
|
|
from_target (type_x, x, &v1);
|
|
from_target (type_y, y, &v2);
|
|
|
|
switch (op)
|
|
{
|
|
case BINOP_ADD:
|
|
v = v1 + v2;
|
|
break;
|
|
|
|
case BINOP_SUB:
|
|
v = v1 - v2;
|
|
break;
|
|
|
|
case BINOP_MUL:
|
|
v = v1 * v2;
|
|
break;
|
|
|
|
case BINOP_DIV:
|
|
v = v1 / v2;
|
|
break;
|
|
|
|
case BINOP_EXP:
|
|
errno = 0;
|
|
v = pow (v1, v2);
|
|
if (errno)
|
|
error (_("Cannot perform exponentiation: %s"),
|
|
safe_strerror (errno));
|
|
break;
|
|
|
|
case BINOP_MIN:
|
|
v = v1 < v2 ? v1 : v2;
|
|
break;
|
|
|
|
case BINOP_MAX:
|
|
v = v1 > v2 ? v1 : v2;
|
|
break;
|
|
|
|
default:
|
|
error (_("Integer-only operation on floating point number."));
|
|
break;
|
|
}
|
|
|
|
to_target (type_res, &v, res);
|
|
}
|
|
|
|
/* Compare the two target byte streams X and Y, interpreted as floating-point
|
|
numbers of types TYPE_X and TYPE_Y, respectively. Return zero if X and Y
|
|
are equal, -1 if X is less than Y, and 1 otherwise. */
|
|
template<typename T> int
|
|
host_float_ops<T>::compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const
|
|
{
|
|
T v1, v2;
|
|
|
|
from_target (type_x, x, &v1);
|
|
from_target (type_y, y, &v2);
|
|
|
|
if (v1 == v2)
|
|
return 0;
|
|
if (v1 < v2)
|
|
return -1;
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Implementation of target_float_ops using the MPFR library
|
|
mpfr_t as intermediate type. */
|
|
|
|
#ifdef HAVE_LIBMPFR
|
|
|
|
#define MPFR_USE_INTMAX_T
|
|
|
|
#include <mpfr.h>
|
|
|
|
class mpfr_float_ops : public target_float_ops
|
|
{
|
|
public:
|
|
std::string to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format) const override;
|
|
bool from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &string) const override;
|
|
|
|
LONGEST to_longest (const gdb_byte *addr,
|
|
const struct type *type) const override;
|
|
void from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST val) const override;
|
|
void from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST val) const override;
|
|
double to_host_double (const gdb_byte *addr,
|
|
const struct type *type) const override;
|
|
void from_host_double (gdb_byte *addr, const struct type *type,
|
|
double val) const override;
|
|
void convert (const gdb_byte *from, const struct type *from_type,
|
|
gdb_byte *to, const struct type *to_type) const override;
|
|
|
|
void binop (enum exp_opcode opcode,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const override;
|
|
int compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const override;
|
|
|
|
private:
|
|
/* Local wrapper class to handle mpfr_t initalization and cleanup. */
|
|
class gdb_mpfr
|
|
{
|
|
public:
|
|
mpfr_t val;
|
|
|
|
gdb_mpfr (const struct type *type)
|
|
{
|
|
const struct floatformat *fmt = floatformat_from_type (type);
|
|
mpfr_init2 (val, floatformat_precision (fmt));
|
|
}
|
|
|
|
gdb_mpfr (const gdb_mpfr &source)
|
|
{
|
|
mpfr_init2 (val, mpfr_get_prec (source.val));
|
|
}
|
|
|
|
~gdb_mpfr ()
|
|
{
|
|
mpfr_clear (val);
|
|
}
|
|
};
|
|
|
|
void from_target (const struct floatformat *fmt,
|
|
const gdb_byte *from, gdb_mpfr &to) const;
|
|
void from_target (const struct type *type,
|
|
const gdb_byte *from, gdb_mpfr &to) const;
|
|
|
|
void to_target (const struct type *type,
|
|
const gdb_mpfr &from, gdb_byte *to) const;
|
|
void to_target (const struct floatformat *fmt,
|
|
const gdb_mpfr &from, gdb_byte *to) const;
|
|
};
|
|
|
|
|
|
/* Convert TO/FROM target floating-point format to mpfr_t. */
|
|
|
|
void
|
|
mpfr_float_ops::from_target (const struct floatformat *fmt,
|
|
const gdb_byte *orig_from, gdb_mpfr &to) const
|
|
{
|
|
const gdb_byte *from = orig_from;
|
|
mpfr_exp_t exponent;
|
|
unsigned long mant;
|
|
unsigned int mant_bits, mant_off;
|
|
int mant_bits_left;
|
|
int special_exponent; /* It's a NaN, denorm or zero. */
|
|
enum floatformat_byteorders order;
|
|
unsigned char newfrom[FLOATFORMAT_LARGEST_BYTES];
|
|
enum float_kind kind;
|
|
|
|
gdb_assert (fmt->totalsize
|
|
<= FLOATFORMAT_LARGEST_BYTES * FLOATFORMAT_CHAR_BIT);
|
|
|
|
/* Handle non-numbers. */
|
|
kind = floatformat_classify (fmt, from);
|
|
if (kind == float_infinite)
|
|
{
|
|
mpfr_set_inf (to.val, floatformat_is_negative (fmt, from) ? -1 : 1);
|
|
return;
|
|
}
|
|
if (kind == float_nan)
|
|
{
|
|
mpfr_set_nan (to.val);
|
|
return;
|
|
}
|
|
|
|
order = floatformat_normalize_byteorder (fmt, from, newfrom);
|
|
|
|
if (order != fmt->byteorder)
|
|
from = newfrom;
|
|
|
|
if (fmt->split_half)
|
|
{
|
|
gdb_mpfr top (to), bot (to);
|
|
|
|
from_target (fmt->split_half, from, top);
|
|
/* Preserve the sign of 0, which is the sign of the top half. */
|
|
if (mpfr_zero_p (top.val))
|
|
{
|
|
mpfr_set (to.val, top.val, MPFR_RNDN);
|
|
return;
|
|
}
|
|
from_target (fmt->split_half,
|
|
from + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2, bot);
|
|
mpfr_add (to.val, top.val, bot.val, MPFR_RNDN);
|
|
return;
|
|
}
|
|
|
|
exponent = get_field (from, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len);
|
|
/* Note that if exponent indicates a NaN, we can't really do anything useful
|
|
(not knowing if the host has NaN's, or how to build one). So it will
|
|
end up as an infinity or something close; that is OK. */
|
|
|
|
mant_bits_left = fmt->man_len;
|
|
mant_off = fmt->man_start;
|
|
mpfr_set_zero (to.val, 0);
|
|
|
|
special_exponent = exponent == 0 || exponent == fmt->exp_nan;
|
|
|
|
/* Don't bias NaNs. Use minimum exponent for denorms. For
|
|
simplicity, we don't check for zero as the exponent doesn't matter.
|
|
Note the cast to int; exp_bias is unsigned, so it's important to
|
|
make sure the operation is done in signed arithmetic. */
|
|
if (!special_exponent)
|
|
exponent -= fmt->exp_bias;
|
|
else if (exponent == 0)
|
|
exponent = 1 - fmt->exp_bias;
|
|
|
|
/* Build the result algebraically. Might go infinite, underflow, etc;
|
|
who cares. */
|
|
|
|
/* If this format uses a hidden bit, explicitly add it in now. Otherwise,
|
|
increment the exponent by one to account for the integer bit. */
|
|
|
|
if (!special_exponent)
|
|
{
|
|
if (fmt->intbit == floatformat_intbit_no)
|
|
mpfr_set_ui_2exp (to.val, 1, exponent, MPFR_RNDN);
|
|
else
|
|
exponent++;
|
|
}
|
|
|
|
gdb_mpfr tmp (to);
|
|
|
|
while (mant_bits_left > 0)
|
|
{
|
|
mant_bits = std::min (mant_bits_left, 32);
|
|
|
|
mant = get_field (from, order, fmt->totalsize, mant_off, mant_bits);
|
|
|
|
mpfr_set_ui (tmp.val, mant, MPFR_RNDN);
|
|
mpfr_mul_2si (tmp.val, tmp.val, exponent - mant_bits, MPFR_RNDN);
|
|
mpfr_add (to.val, to.val, tmp.val, MPFR_RNDN);
|
|
exponent -= mant_bits;
|
|
mant_off += mant_bits;
|
|
mant_bits_left -= mant_bits;
|
|
}
|
|
|
|
/* Negate it if negative. */
|
|
if (get_field (from, order, fmt->totalsize, fmt->sign_start, 1))
|
|
mpfr_neg (to.val, to.val, MPFR_RNDN);
|
|
}
|
|
|
|
void
|
|
mpfr_float_ops::from_target (const struct type *type,
|
|
const gdb_byte *from, gdb_mpfr &to) const
|
|
{
|
|
from_target (floatformat_from_type (type), from, to);
|
|
}
|
|
|
|
void
|
|
mpfr_float_ops::to_target (const struct floatformat *fmt,
|
|
const gdb_mpfr &from, gdb_byte *orig_to) const
|
|
{
|
|
unsigned char *to = orig_to;
|
|
mpfr_exp_t exponent;
|
|
unsigned int mant_bits, mant_off;
|
|
int mant_bits_left;
|
|
enum floatformat_byteorders order = fmt->byteorder;
|
|
unsigned char newto[FLOATFORMAT_LARGEST_BYTES];
|
|
|
|
if (order != floatformat_little)
|
|
order = floatformat_big;
|
|
|
|
if (order != fmt->byteorder)
|
|
to = newto;
|
|
|
|
memset (to, 0, floatformat_totalsize_bytes (fmt));
|
|
|
|
if (fmt->split_half)
|
|
{
|
|
gdb_mpfr top (from), bot (from);
|
|
|
|
mpfr_set (top.val, from.val, MPFR_RNDN);
|
|
/* If the rounded top half is Inf, the bottom must be 0 not NaN
|
|
or Inf. */
|
|
if (mpfr_inf_p (top.val))
|
|
mpfr_set_zero (bot.val, 0);
|
|
else
|
|
mpfr_sub (bot.val, from.val, top.val, MPFR_RNDN);
|
|
|
|
to_target (fmt->split_half, top, to);
|
|
to_target (fmt->split_half, bot,
|
|
to + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2);
|
|
return;
|
|
}
|
|
|
|
gdb_mpfr tmp (from);
|
|
|
|
if (mpfr_zero_p (from.val))
|
|
goto finalize_byteorder; /* Result is zero */
|
|
|
|
mpfr_set (tmp.val, from.val, MPFR_RNDN);
|
|
|
|
if (mpfr_nan_p (tmp.val)) /* Result is NaN */
|
|
{
|
|
/* From is NaN */
|
|
put_field (to, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
/* Be sure it's not infinity, but NaN value is irrel. */
|
|
put_field (to, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 1);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
/* If negative, set the sign bit. */
|
|
if (mpfr_sgn (tmp.val) < 0)
|
|
{
|
|
put_field (to, order, fmt->totalsize, fmt->sign_start, 1, 1);
|
|
mpfr_neg (tmp.val, tmp.val, MPFR_RNDN);
|
|
}
|
|
|
|
if (mpfr_inf_p (tmp.val)) /* Result is Infinity. */
|
|
{
|
|
/* Infinity exponent is same as NaN's. */
|
|
put_field (to, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
/* Infinity mantissa is all zeroes. */
|
|
put_field (to, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
mpfr_frexp (&exponent, tmp.val, tmp.val, MPFR_RNDN);
|
|
|
|
if (exponent + fmt->exp_bias <= 0)
|
|
{
|
|
/* The value is too small to be expressed in the destination
|
|
type (not enough bits in the exponent. Treat as 0. */
|
|
put_field (to, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, 0);
|
|
put_field (to, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
if (exponent + fmt->exp_bias >= (1 << fmt->exp_len))
|
|
{
|
|
/* The value is too large to fit into the destination.
|
|
Treat as infinity. */
|
|
put_field (to, order, fmt->totalsize, fmt->exp_start,
|
|
fmt->exp_len, fmt->exp_nan);
|
|
put_field (to, order, fmt->totalsize, fmt->man_start,
|
|
fmt->man_len, 0);
|
|
goto finalize_byteorder;
|
|
}
|
|
|
|
put_field (to, order, fmt->totalsize, fmt->exp_start, fmt->exp_len,
|
|
exponent + fmt->exp_bias - 1);
|
|
|
|
mant_bits_left = fmt->man_len;
|
|
mant_off = fmt->man_start;
|
|
while (mant_bits_left > 0)
|
|
{
|
|
unsigned long mant_long;
|
|
|
|
mant_bits = mant_bits_left < 32 ? mant_bits_left : 32;
|
|
|
|
mpfr_mul_2ui (tmp.val, tmp.val, 32, MPFR_RNDN);
|
|
mant_long = mpfr_get_ui (tmp.val, MPFR_RNDZ) & 0xffffffffL;
|
|
mpfr_sub_ui (tmp.val, tmp.val, mant_long, MPFR_RNDZ);
|
|
|
|
/* If the integer bit is implicit, then we need to discard it.
|
|
If we are discarding a zero, we should be (but are not) creating
|
|
a denormalized number which means adjusting the exponent
|
|
(I think). */
|
|
if (mant_bits_left == fmt->man_len
|
|
&& fmt->intbit == floatformat_intbit_no)
|
|
{
|
|
mant_long <<= 1;
|
|
mant_long &= 0xffffffffL;
|
|
/* If we are processing the top 32 mantissa bits of a doublest
|
|
so as to convert to a float value with implied integer bit,
|
|
we will only be putting 31 of those 32 bits into the
|
|
final value due to the discarding of the top bit. In the
|
|
case of a small float value where the number of mantissa
|
|
bits is less than 32, discarding the top bit does not alter
|
|
the number of bits we will be adding to the result. */
|
|
if (mant_bits == 32)
|
|
mant_bits -= 1;
|
|
}
|
|
|
|
if (mant_bits < 32)
|
|
{
|
|
/* The bits we want are in the most significant MANT_BITS bits of
|
|
mant_long. Move them to the least significant. */
|
|
mant_long >>= 32 - mant_bits;
|
|
}
|
|
|
|
put_field (to, order, fmt->totalsize,
|
|
mant_off, mant_bits, mant_long);
|
|
mant_off += mant_bits;
|
|
mant_bits_left -= mant_bits;
|
|
}
|
|
|
|
finalize_byteorder:
|
|
/* Do we need to byte-swap the words in the result? */
|
|
if (order != fmt->byteorder)
|
|
floatformat_normalize_byteorder (fmt, newto, orig_to);
|
|
}
|
|
|
|
void
|
|
mpfr_float_ops::to_target (const struct type *type,
|
|
const gdb_mpfr &from, gdb_byte *to) const
|
|
{
|
|
/* Ensure possible padding bytes in the target buffer are zeroed out. */
|
|
memset (to, 0, TYPE_LENGTH (type));
|
|
|
|
to_target (floatformat_from_type (type), from, to);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a string, optionally using the print format FORMAT. */
|
|
std::string
|
|
mpfr_float_ops::to_string (const gdb_byte *addr,
|
|
const struct type *type,
|
|
const char *format) const
|
|
{
|
|
const struct floatformat *fmt = floatformat_from_type (type);
|
|
|
|
/* Unless we need to adhere to a specific format, provide special
|
|
output for certain cases. */
|
|
if (format == nullptr)
|
|
{
|
|
/* Detect invalid representations. */
|
|
if (!floatformat_is_valid (fmt, addr))
|
|
return "<invalid float value>";
|
|
|
|
/* Handle NaN and Inf. */
|
|
enum float_kind kind = floatformat_classify (fmt, addr);
|
|
if (kind == float_nan)
|
|
{
|
|
const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
|
|
const char *mantissa = floatformat_mantissa (fmt, addr);
|
|
return string_printf ("%snan(0x%s)", sign, mantissa);
|
|
}
|
|
else if (kind == float_infinite)
|
|
{
|
|
const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
|
|
return string_printf ("%sinf", sign);
|
|
}
|
|
}
|
|
|
|
/* Determine the format string to use on the host side. */
|
|
std::string host_format = floatformat_printf_format (fmt, format, 'R');
|
|
|
|
gdb_mpfr tmp (type);
|
|
from_target (type, addr, tmp);
|
|
|
|
int size = mpfr_snprintf (NULL, 0, host_format.c_str (), tmp.val);
|
|
std::string str (size, '\0');
|
|
mpfr_sprintf (&str[0], host_format.c_str (), tmp.val);
|
|
|
|
return str;
|
|
}
|
|
|
|
/* Parse string STRING into a target floating-number of type TYPE and
|
|
store it as byte-stream ADDR. Return whether parsing succeeded. */
|
|
bool
|
|
mpfr_float_ops::from_string (gdb_byte *addr,
|
|
const struct type *type,
|
|
const std::string &in) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
|
|
char *endptr;
|
|
mpfr_strtofr (tmp.val, in.c_str (), &endptr, 0, MPFR_RNDN);
|
|
|
|
/* We only accept the whole string. */
|
|
if (*endptr)
|
|
return false;
|
|
|
|
to_target (type, tmp, addr);
|
|
return true;
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to an integer value (rounding towards zero). */
|
|
LONGEST
|
|
mpfr_float_ops::to_longest (const gdb_byte *addr,
|
|
const struct type *type) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
from_target (type, addr, tmp);
|
|
return mpfr_get_sj (tmp.val, MPFR_RNDZ);
|
|
}
|
|
|
|
/* Convert signed integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
void
|
|
mpfr_float_ops::from_longest (gdb_byte *addr,
|
|
const struct type *type,
|
|
LONGEST val) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
mpfr_set_sj (tmp.val, val, MPFR_RNDN);
|
|
to_target (type, tmp, addr);
|
|
}
|
|
|
|
/* Convert unsigned integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
void
|
|
mpfr_float_ops::from_ulongest (gdb_byte *addr,
|
|
const struct type *type,
|
|
ULONGEST val) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
mpfr_set_uj (tmp.val, val, MPFR_RNDN);
|
|
to_target (type, tmp, addr);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a floating-point value in the host "double" format. */
|
|
double
|
|
mpfr_float_ops::to_host_double (const gdb_byte *addr,
|
|
const struct type *type) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
from_target (type, addr, tmp);
|
|
return mpfr_get_d (tmp.val, MPFR_RNDN);
|
|
}
|
|
|
|
/* Convert floating-point value VAL in the host "double" format to a target
|
|
floating-number of type TYPE and store it as byte-stream ADDR. */
|
|
void
|
|
mpfr_float_ops::from_host_double (gdb_byte *addr,
|
|
const struct type *type,
|
|
double val) const
|
|
{
|
|
gdb_mpfr tmp (type);
|
|
mpfr_set_d (tmp.val, val, MPFR_RNDN);
|
|
to_target (type, tmp, addr);
|
|
}
|
|
|
|
/* Convert a floating-point number of type FROM_TYPE from the target
|
|
byte-stream FROM to a floating-point number of type TO_TYPE, and
|
|
store it to the target byte-stream TO. */
|
|
void
|
|
mpfr_float_ops::convert (const gdb_byte *from,
|
|
const struct type *from_type,
|
|
gdb_byte *to,
|
|
const struct type *to_type) const
|
|
{
|
|
gdb_mpfr from_tmp (from_type), to_tmp (to_type);
|
|
from_target (from_type, from, from_tmp);
|
|
mpfr_set (to_tmp.val, from_tmp.val, MPFR_RNDN);
|
|
to_target (to_type, to_tmp, to);
|
|
}
|
|
|
|
/* Perform the binary operation indicated by OPCODE, using as operands the
|
|
target byte streams X and Y, interpreted as floating-point numbers of
|
|
types TYPE_X and TYPE_Y, respectively. Convert the result to type
|
|
TYPE_RES and store it into the byte-stream RES. */
|
|
void
|
|
mpfr_float_ops::binop (enum exp_opcode op,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const
|
|
{
|
|
gdb_mpfr x_tmp (type_x), y_tmp (type_y), tmp (type_res);
|
|
|
|
from_target (type_x, x, x_tmp);
|
|
from_target (type_y, y, y_tmp);
|
|
|
|
switch (op)
|
|
{
|
|
case BINOP_ADD:
|
|
mpfr_add (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_SUB:
|
|
mpfr_sub (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_MUL:
|
|
mpfr_mul (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_DIV:
|
|
mpfr_div (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_EXP:
|
|
mpfr_pow (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_MIN:
|
|
mpfr_min (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
case BINOP_MAX:
|
|
mpfr_max (tmp.val, x_tmp.val, y_tmp.val, MPFR_RNDN);
|
|
break;
|
|
|
|
default:
|
|
error (_("Integer-only operation on floating point number."));
|
|
break;
|
|
}
|
|
|
|
to_target (type_res, tmp, res);
|
|
}
|
|
|
|
/* Compare the two target byte streams X and Y, interpreted as floating-point
|
|
numbers of types TYPE_X and TYPE_Y, respectively. Return zero if X and Y
|
|
are equal, -1 if X is less than Y, and 1 otherwise. */
|
|
int
|
|
mpfr_float_ops::compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const
|
|
{
|
|
gdb_mpfr x_tmp (type_x), y_tmp (type_y);
|
|
|
|
from_target (type_x, x, x_tmp);
|
|
from_target (type_y, y, y_tmp);
|
|
|
|
if (mpfr_equal_p (x_tmp.val, y_tmp.val))
|
|
return 0;
|
|
else if (mpfr_less_p (x_tmp.val, y_tmp.val))
|
|
return -1;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/* Helper routines operating on decimal floating-point data. */
|
|
|
|
/* Decimal floating point is one of the extension to IEEE 754, which is
|
|
described in http://grouper.ieee.org/groups/754/revision.html and
|
|
http://www2.hursley.ibm.com/decimal/. It completes binary floating
|
|
point by representing floating point more exactly. */
|
|
|
|
/* The order of the following headers is important for making sure
|
|
decNumber structure is large enough to hold decimal128 digits. */
|
|
|
|
#include "dpd/decimal128.h"
|
|
#include "dpd/decimal64.h"
|
|
#include "dpd/decimal32.h"
|
|
|
|
/* When using decimal128, this is the maximum string length + 1
|
|
(value comes from libdecnumber's DECIMAL128_String constant). */
|
|
#define MAX_DECIMAL_STRING 43
|
|
|
|
/* In GDB, we are using an array of gdb_byte to represent decimal values.
|
|
They are stored in host byte order. This routine does the conversion if
|
|
the target byte order is different. */
|
|
static void
|
|
match_endianness (const gdb_byte *from, const struct type *type, gdb_byte *to)
|
|
{
|
|
gdb_assert (TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
|
|
|
|
int len = TYPE_LENGTH (type);
|
|
int i;
|
|
|
|
#if WORDS_BIGENDIAN
|
|
#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
|
|
#else
|
|
#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
|
|
#endif
|
|
|
|
if (gdbarch_byte_order (get_type_arch (type)) == OPPOSITE_BYTE_ORDER)
|
|
for (i = 0; i < len; i++)
|
|
to[i] = from[len - i - 1];
|
|
else
|
|
for (i = 0; i < len; i++)
|
|
to[i] = from[i];
|
|
|
|
return;
|
|
}
|
|
|
|
/* Helper function to get the appropriate libdecnumber context for each size
|
|
of decimal float. */
|
|
static void
|
|
set_decnumber_context (decContext *ctx, const struct type *type)
|
|
{
|
|
gdb_assert (TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
|
|
|
|
switch (TYPE_LENGTH (type))
|
|
{
|
|
case 4:
|
|
decContextDefault (ctx, DEC_INIT_DECIMAL32);
|
|
break;
|
|
case 8:
|
|
decContextDefault (ctx, DEC_INIT_DECIMAL64);
|
|
break;
|
|
case 16:
|
|
decContextDefault (ctx, DEC_INIT_DECIMAL128);
|
|
break;
|
|
}
|
|
|
|
ctx->traps = 0;
|
|
}
|
|
|
|
/* Check for errors signaled in the decimal context structure. */
|
|
static void
|
|
decimal_check_errors (decContext *ctx)
|
|
{
|
|
/* An error here could be a division by zero, an overflow, an underflow or
|
|
an invalid operation (from the DEC_Errors constant in decContext.h).
|
|
Since GDB doesn't complain about division by zero, overflow or underflow
|
|
errors for binary floating, we won't complain about them for decimal
|
|
floating either. */
|
|
if (ctx->status & DEC_IEEE_854_Invalid_operation)
|
|
{
|
|
/* Leave only the error bits in the status flags. */
|
|
ctx->status &= DEC_IEEE_854_Invalid_operation;
|
|
error (_("Cannot perform operation: %s"),
|
|
decContextStatusToString (ctx));
|
|
}
|
|
}
|
|
|
|
/* Helper function to convert from libdecnumber's appropriate representation
|
|
for computation to each size of decimal float. */
|
|
static void
|
|
decimal_from_number (const decNumber *from,
|
|
gdb_byte *to, const struct type *type)
|
|
{
|
|
gdb_byte dec[16];
|
|
|
|
decContext set;
|
|
|
|
set_decnumber_context (&set, type);
|
|
|
|
switch (TYPE_LENGTH (type))
|
|
{
|
|
case 4:
|
|
decimal32FromNumber ((decimal32 *) dec, from, &set);
|
|
break;
|
|
case 8:
|
|
decimal64FromNumber ((decimal64 *) dec, from, &set);
|
|
break;
|
|
case 16:
|
|
decimal128FromNumber ((decimal128 *) dec, from, &set);
|
|
break;
|
|
default:
|
|
error (_("Unknown decimal floating point type."));
|
|
break;
|
|
}
|
|
|
|
match_endianness (dec, type, to);
|
|
}
|
|
|
|
/* Helper function to convert each size of decimal float to libdecnumber's
|
|
appropriate representation for computation. */
|
|
static void
|
|
decimal_to_number (const gdb_byte *addr, const struct type *type,
|
|
decNumber *to)
|
|
{
|
|
gdb_byte dec[16];
|
|
match_endianness (addr, type, dec);
|
|
|
|
switch (TYPE_LENGTH (type))
|
|
{
|
|
case 4:
|
|
decimal32ToNumber ((decimal32 *) dec, to);
|
|
break;
|
|
case 8:
|
|
decimal64ToNumber ((decimal64 *) dec, to);
|
|
break;
|
|
case 16:
|
|
decimal128ToNumber ((decimal128 *) dec, to);
|
|
break;
|
|
default:
|
|
error (_("Unknown decimal floating point type."));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Returns true if ADDR (which is of type TYPE) is the number zero. */
|
|
static bool
|
|
decimal_is_zero (const gdb_byte *addr, const struct type *type)
|
|
{
|
|
decNumber number;
|
|
|
|
decimal_to_number (addr, type, &number);
|
|
|
|
return decNumberIsZero (&number);
|
|
}
|
|
|
|
|
|
/* Implementation of target_float_ops using the libdecnumber decNumber type
|
|
as intermediate format. */
|
|
|
|
class decimal_float_ops : public target_float_ops
|
|
{
|
|
public:
|
|
std::string to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format) const override;
|
|
bool from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &string) const override;
|
|
|
|
LONGEST to_longest (const gdb_byte *addr,
|
|
const struct type *type) const override;
|
|
void from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST val) const override;
|
|
void from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST val) const override;
|
|
double to_host_double (const gdb_byte *addr,
|
|
const struct type *type) const override
|
|
{
|
|
/* We don't support conversions between target decimal floating-point
|
|
types and the host double type. */
|
|
gdb_assert_not_reached ("invalid operation on decimal float");
|
|
}
|
|
void from_host_double (gdb_byte *addr, const struct type *type,
|
|
double val) const override
|
|
{
|
|
/* We don't support conversions between target decimal floating-point
|
|
types and the host double type. */
|
|
gdb_assert_not_reached ("invalid operation on decimal float");
|
|
}
|
|
void convert (const gdb_byte *from, const struct type *from_type,
|
|
gdb_byte *to, const struct type *to_type) const override;
|
|
|
|
void binop (enum exp_opcode opcode,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const override;
|
|
int compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const override;
|
|
};
|
|
|
|
/* Convert decimal type to its string representation. LEN is the length
|
|
of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and
|
|
16 bytes for decimal128. */
|
|
std::string
|
|
decimal_float_ops::to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format = nullptr) const
|
|
{
|
|
gdb_byte dec[16];
|
|
|
|
match_endianness (addr, type, dec);
|
|
|
|
if (format != nullptr)
|
|
{
|
|
/* We don't handle format strings (yet). If the host printf supports
|
|
decimal floating point types, just use this. Otherwise, fall back
|
|
to printing the number while ignoring the format string. */
|
|
#if defined (PRINTF_HAS_DECFLOAT)
|
|
/* FIXME: This makes unwarranted assumptions about the host ABI! */
|
|
return string_printf (format, dec);
|
|
#endif
|
|
}
|
|
|
|
std::string result;
|
|
result.resize (MAX_DECIMAL_STRING);
|
|
|
|
switch (TYPE_LENGTH (type))
|
|
{
|
|
case 4:
|
|
decimal32ToString ((decimal32 *) dec, &result[0]);
|
|
break;
|
|
case 8:
|
|
decimal64ToString ((decimal64 *) dec, &result[0]);
|
|
break;
|
|
case 16:
|
|
decimal128ToString ((decimal128 *) dec, &result[0]);
|
|
break;
|
|
default:
|
|
error (_("Unknown decimal floating point type."));
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Convert the string form of a decimal value to its decimal representation.
|
|
LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for
|
|
decimal64 and 16 bytes for decimal128. */
|
|
bool
|
|
decimal_float_ops::from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &string) const
|
|
{
|
|
decContext set;
|
|
gdb_byte dec[16];
|
|
|
|
set_decnumber_context (&set, type);
|
|
|
|
switch (TYPE_LENGTH (type))
|
|
{
|
|
case 4:
|
|
decimal32FromString ((decimal32 *) dec, string.c_str (), &set);
|
|
break;
|
|
case 8:
|
|
decimal64FromString ((decimal64 *) dec, string.c_str (), &set);
|
|
break;
|
|
case 16:
|
|
decimal128FromString ((decimal128 *) dec, string.c_str (), &set);
|
|
break;
|
|
default:
|
|
error (_("Unknown decimal floating point type."));
|
|
break;
|
|
}
|
|
|
|
match_endianness (dec, type, addr);
|
|
|
|
/* Check for errors in the DFP operation. */
|
|
decimal_check_errors (&set);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Converts a LONGEST to a decimal float of specified LEN bytes. */
|
|
void
|
|
decimal_float_ops::from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST from) const
|
|
{
|
|
decNumber number;
|
|
|
|
if ((int32_t) from != from)
|
|
/* libdecnumber can convert only 32-bit integers. */
|
|
error (_("Conversion of large integer to a "
|
|
"decimal floating type is not supported."));
|
|
|
|
decNumberFromInt32 (&number, (int32_t) from);
|
|
|
|
decimal_from_number (&number, addr, type);
|
|
}
|
|
|
|
/* Converts a ULONGEST to a decimal float of specified LEN bytes. */
|
|
void
|
|
decimal_float_ops::from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST from) const
|
|
{
|
|
decNumber number;
|
|
|
|
if ((uint32_t) from != from)
|
|
/* libdecnumber can convert only 32-bit integers. */
|
|
error (_("Conversion of large integer to a "
|
|
"decimal floating type is not supported."));
|
|
|
|
decNumberFromUInt32 (&number, (uint32_t) from);
|
|
|
|
decimal_from_number (&number, addr, type);
|
|
}
|
|
|
|
/* Converts a decimal float of LEN bytes to a LONGEST. */
|
|
LONGEST
|
|
decimal_float_ops::to_longest (const gdb_byte *addr,
|
|
const struct type *type) const
|
|
{
|
|
/* libdecnumber has a function to convert from decimal to integer, but
|
|
it doesn't work when the decimal number has a fractional part. */
|
|
std::string str = to_string (addr, type);
|
|
return strtoll (str.c_str (), NULL, 10);
|
|
}
|
|
|
|
/* Perform operation OP with operands X and Y with sizes LEN_X and LEN_Y
|
|
and byte orders BYTE_ORDER_X and BYTE_ORDER_Y, and store value in
|
|
RESULT with size LEN_RESULT and byte order BYTE_ORDER_RESULT. */
|
|
void
|
|
decimal_float_ops::binop (enum exp_opcode op,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res) const
|
|
{
|
|
decContext set;
|
|
decNumber number1, number2, number3;
|
|
|
|
decimal_to_number (x, type_x, &number1);
|
|
decimal_to_number (y, type_y, &number2);
|
|
|
|
set_decnumber_context (&set, type_res);
|
|
|
|
switch (op)
|
|
{
|
|
case BINOP_ADD:
|
|
decNumberAdd (&number3, &number1, &number2, &set);
|
|
break;
|
|
case BINOP_SUB:
|
|
decNumberSubtract (&number3, &number1, &number2, &set);
|
|
break;
|
|
case BINOP_MUL:
|
|
decNumberMultiply (&number3, &number1, &number2, &set);
|
|
break;
|
|
case BINOP_DIV:
|
|
decNumberDivide (&number3, &number1, &number2, &set);
|
|
break;
|
|
case BINOP_EXP:
|
|
decNumberPower (&number3, &number1, &number2, &set);
|
|
break;
|
|
default:
|
|
error (_("Operation not valid for decimal floating point number."));
|
|
break;
|
|
}
|
|
|
|
/* Check for errors in the DFP operation. */
|
|
decimal_check_errors (&set);
|
|
|
|
decimal_from_number (&number3, res, type_res);
|
|
}
|
|
|
|
/* Compares two numbers numerically. If X is less than Y then the return value
|
|
will be -1. If they are equal, then the return value will be 0. If X is
|
|
greater than the Y then the return value will be 1. */
|
|
int
|
|
decimal_float_ops::compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y) const
|
|
{
|
|
decNumber number1, number2, result;
|
|
decContext set;
|
|
const struct type *type_result;
|
|
|
|
decimal_to_number (x, type_x, &number1);
|
|
decimal_to_number (y, type_y, &number2);
|
|
|
|
/* Perform the comparison in the larger of the two sizes. */
|
|
type_result = TYPE_LENGTH (type_x) > TYPE_LENGTH (type_y) ? type_x : type_y;
|
|
set_decnumber_context (&set, type_result);
|
|
|
|
decNumberCompare (&result, &number1, &number2, &set);
|
|
|
|
/* Check for errors in the DFP operation. */
|
|
decimal_check_errors (&set);
|
|
|
|
if (decNumberIsNaN (&result))
|
|
error (_("Comparison with an invalid number (NaN)."));
|
|
else if (decNumberIsZero (&result))
|
|
return 0;
|
|
else if (decNumberIsNegative (&result))
|
|
return -1;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/* Convert a decimal value from a decimal type with LEN_FROM bytes to a
|
|
decimal type with LEN_TO bytes. */
|
|
void
|
|
decimal_float_ops::convert (const gdb_byte *from, const struct type *from_type,
|
|
gdb_byte *to, const struct type *to_type) const
|
|
{
|
|
decNumber number;
|
|
|
|
decimal_to_number (from, from_type, &number);
|
|
decimal_from_number (&number, to, to_type);
|
|
}
|
|
|
|
|
|
/* Typed floating-point routines. These routines operate on floating-point
|
|
values in target format, represented by a byte buffer interpreted as a
|
|
"struct type", which may be either a binary or decimal floating-point
|
|
type (TYPE_CODE_FLT or TYPE_CODE_DECFLOAT). */
|
|
|
|
/* Return whether TYPE1 and TYPE2 are of the same category (binary or
|
|
decimal floating-point). */
|
|
static bool
|
|
target_float_same_category_p (const struct type *type1,
|
|
const struct type *type2)
|
|
{
|
|
return TYPE_CODE (type1) == TYPE_CODE (type2);
|
|
}
|
|
|
|
/* Return whether TYPE1 and TYPE2 use the same floating-point format. */
|
|
static bool
|
|
target_float_same_format_p (const struct type *type1,
|
|
const struct type *type2)
|
|
{
|
|
if (!target_float_same_category_p (type1, type2))
|
|
return false;
|
|
|
|
switch (TYPE_CODE (type1))
|
|
{
|
|
case TYPE_CODE_FLT:
|
|
return floatformat_from_type (type1) == floatformat_from_type (type2);
|
|
|
|
case TYPE_CODE_DECFLOAT:
|
|
return (TYPE_LENGTH (type1) == TYPE_LENGTH (type2)
|
|
&& (gdbarch_byte_order (get_type_arch (type1))
|
|
== gdbarch_byte_order (get_type_arch (type2))));
|
|
|
|
default:
|
|
gdb_assert_not_reached ("unexpected type code");
|
|
}
|
|
}
|
|
|
|
/* Return the size (without padding) of the target floating-point
|
|
format used by TYPE. */
|
|
static int
|
|
target_float_format_length (const struct type *type)
|
|
{
|
|
switch (TYPE_CODE (type))
|
|
{
|
|
case TYPE_CODE_FLT:
|
|
return floatformat_totalsize_bytes (floatformat_from_type (type));
|
|
|
|
case TYPE_CODE_DECFLOAT:
|
|
return TYPE_LENGTH (type);
|
|
|
|
default:
|
|
gdb_assert_not_reached ("unexpected type code");
|
|
}
|
|
}
|
|
|
|
/* Identifiers of available host-side intermediate formats. These must
|
|
be sorted so the that the more "general" kinds come later. */
|
|
enum target_float_ops_kind
|
|
{
|
|
/* Target binary floating-point formats that match a host format. */
|
|
host_float = 0,
|
|
host_double,
|
|
host_long_double,
|
|
/* Any other target binary floating-point format. */
|
|
binary,
|
|
/* Any target decimal floating-point format. */
|
|
decimal
|
|
};
|
|
|
|
/* Given a target type TYPE, choose the best host-side intermediate format
|
|
to perform operations on TYPE in. */
|
|
static enum target_float_ops_kind
|
|
get_target_float_ops_kind (const struct type *type)
|
|
{
|
|
switch (TYPE_CODE (type))
|
|
{
|
|
case TYPE_CODE_FLT:
|
|
{
|
|
const struct floatformat *fmt = floatformat_from_type (type);
|
|
|
|
/* Binary floating-point formats matching a host format. */
|
|
if (fmt == host_float_format)
|
|
return target_float_ops_kind::host_float;
|
|
if (fmt == host_double_format)
|
|
return target_float_ops_kind::host_double;
|
|
if (fmt == host_long_double_format)
|
|
return target_float_ops_kind::host_long_double;
|
|
|
|
/* Any other binary floating-point format. */
|
|
return target_float_ops_kind::binary;
|
|
}
|
|
|
|
case TYPE_CODE_DECFLOAT:
|
|
{
|
|
/* Any decimal floating-point format. */
|
|
return target_float_ops_kind::decimal;
|
|
}
|
|
|
|
default:
|
|
gdb_assert_not_reached ("unexpected type code");
|
|
}
|
|
}
|
|
|
|
/* Return target_float_ops to peform operations for KIND. */
|
|
static const target_float_ops *
|
|
get_target_float_ops (enum target_float_ops_kind kind)
|
|
{
|
|
switch (kind)
|
|
{
|
|
/* If the type format matches one of the host floating-point
|
|
types, use that type as intermediate format. */
|
|
case target_float_ops_kind::host_float:
|
|
{
|
|
static host_float_ops<float> host_float_ops_float;
|
|
return &host_float_ops_float;
|
|
}
|
|
|
|
case target_float_ops_kind::host_double:
|
|
{
|
|
static host_float_ops<double> host_float_ops_double;
|
|
return &host_float_ops_double;
|
|
}
|
|
|
|
case target_float_ops_kind::host_long_double:
|
|
{
|
|
static host_float_ops<long double> host_float_ops_long_double;
|
|
return &host_float_ops_long_double;
|
|
}
|
|
|
|
/* For binary floating-point formats that do not match any host format,
|
|
use mpfr_t as intermediate format to provide precise target-floating
|
|
point emulation. However, if the MPFR library is not availabe,
|
|
use the largest host floating-point type as intermediate format. */
|
|
case target_float_ops_kind::binary:
|
|
{
|
|
#ifdef HAVE_LIBMPFR
|
|
static mpfr_float_ops binary_float_ops;
|
|
#else
|
|
static host_float_ops<long double> binary_float_ops;
|
|
#endif
|
|
return &binary_float_ops;
|
|
}
|
|
|
|
/* For decimal floating-point types, always use the libdecnumber
|
|
decNumber type as intermediate format. */
|
|
case target_float_ops_kind::decimal:
|
|
{
|
|
static decimal_float_ops decimal_float_ops;
|
|
return &decimal_float_ops;
|
|
}
|
|
|
|
default:
|
|
gdb_assert_not_reached ("unexpected target_float_ops_kind");
|
|
}
|
|
}
|
|
|
|
/* Given a target type TYPE, determine the best host-side intermediate format
|
|
to perform operations on TYPE in. */
|
|
static const target_float_ops *
|
|
get_target_float_ops (const struct type *type)
|
|
{
|
|
enum target_float_ops_kind kind = get_target_float_ops_kind (type);
|
|
return get_target_float_ops (kind);
|
|
}
|
|
|
|
/* The same for operations involving two target types TYPE1 and TYPE2. */
|
|
static const target_float_ops *
|
|
get_target_float_ops (const struct type *type1, const struct type *type2)
|
|
{
|
|
gdb_assert (TYPE_CODE (type1) == TYPE_CODE (type2));
|
|
|
|
enum target_float_ops_kind kind1 = get_target_float_ops_kind (type1);
|
|
enum target_float_ops_kind kind2 = get_target_float_ops_kind (type2);
|
|
|
|
/* Given the way the kinds are sorted, we simply choose the larger one;
|
|
this will be able to hold values of either type. */
|
|
return get_target_float_ops (std::max (kind1, kind2));
|
|
}
|
|
|
|
/* Return whether the byte-stream ADDR holds a valid value of
|
|
floating-point type TYPE. */
|
|
bool
|
|
target_float_is_valid (const gdb_byte *addr, const struct type *type)
|
|
{
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
|
return floatformat_is_valid (floatformat_from_type (type), addr);
|
|
|
|
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
|
|
return true;
|
|
|
|
gdb_assert_not_reached ("unexpected type code");
|
|
}
|
|
|
|
/* Return whether the byte-stream ADDR, interpreted as floating-point
|
|
type TYPE, is numerically equal to zero (of either sign). */
|
|
bool
|
|
target_float_is_zero (const gdb_byte *addr, const struct type *type)
|
|
{
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
|
return (floatformat_classify (floatformat_from_type (type), addr)
|
|
== float_zero);
|
|
|
|
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
|
|
return decimal_is_zero (addr, type);
|
|
|
|
gdb_assert_not_reached ("unexpected type code");
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a string, optionally using the print format FORMAT. */
|
|
std::string
|
|
target_float_to_string (const gdb_byte *addr, const struct type *type,
|
|
const char *format)
|
|
{
|
|
/* Unless we need to adhere to a specific format, provide special
|
|
output for special cases of binary floating-point numbers. */
|
|
if (format == nullptr && TYPE_CODE (type) == TYPE_CODE_FLT)
|
|
{
|
|
const struct floatformat *fmt = floatformat_from_type (type);
|
|
|
|
/* Detect invalid representations. */
|
|
if (!floatformat_is_valid (fmt, addr))
|
|
return "<invalid float value>";
|
|
|
|
/* Handle NaN and Inf. */
|
|
enum float_kind kind = floatformat_classify (fmt, addr);
|
|
if (kind == float_nan)
|
|
{
|
|
const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
|
|
const char *mantissa = floatformat_mantissa (fmt, addr);
|
|
return string_printf ("%snan(0x%s)", sign, mantissa);
|
|
}
|
|
else if (kind == float_infinite)
|
|
{
|
|
const char *sign = floatformat_is_negative (fmt, addr)? "-" : "";
|
|
return string_printf ("%sinf", sign);
|
|
}
|
|
}
|
|
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
return ops->to_string (addr, type, format);
|
|
}
|
|
|
|
/* Parse string STRING into a target floating-number of type TYPE and
|
|
store it as byte-stream ADDR. Return whether parsing succeeded. */
|
|
bool
|
|
target_float_from_string (gdb_byte *addr, const struct type *type,
|
|
const std::string &string)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
return ops->from_string (addr, type, string);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to an integer value (rounding towards zero). */
|
|
LONGEST
|
|
target_float_to_longest (const gdb_byte *addr, const struct type *type)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
return ops->to_longest (addr, type);
|
|
}
|
|
|
|
/* Convert signed integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
void
|
|
target_float_from_longest (gdb_byte *addr, const struct type *type,
|
|
LONGEST val)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
ops->from_longest (addr, type, val);
|
|
}
|
|
|
|
/* Convert unsigned integer VAL to a target floating-number of type TYPE
|
|
and store it as byte-stream ADDR. */
|
|
void
|
|
target_float_from_ulongest (gdb_byte *addr, const struct type *type,
|
|
ULONGEST val)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
ops->from_ulongest (addr, type, val);
|
|
}
|
|
|
|
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
|
|
to a floating-point value in the host "double" format. */
|
|
double
|
|
target_float_to_host_double (const gdb_byte *addr,
|
|
const struct type *type)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
return ops->to_host_double (addr, type);
|
|
}
|
|
|
|
/* Convert floating-point value VAL in the host "double" format to a target
|
|
floating-number of type TYPE and store it as byte-stream ADDR. */
|
|
void
|
|
target_float_from_host_double (gdb_byte *addr, const struct type *type,
|
|
double val)
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (type);
|
|
ops->from_host_double (addr, type, val);
|
|
}
|
|
|
|
/* Convert a floating-point number of type FROM_TYPE from the target
|
|
byte-stream FROM to a floating-point number of type TO_TYPE, and
|
|
store it to the target byte-stream TO. */
|
|
void
|
|
target_float_convert (const gdb_byte *from, const struct type *from_type,
|
|
gdb_byte *to, const struct type *to_type)
|
|
{
|
|
/* We cannot directly convert between binary and decimal floating-point
|
|
types, so go via an intermediary string. */
|
|
if (!target_float_same_category_p (from_type, to_type))
|
|
{
|
|
std::string str = target_float_to_string (from, from_type);
|
|
target_float_from_string (to, to_type, str);
|
|
return;
|
|
}
|
|
|
|
/* Convert between two different formats in the same category. */
|
|
if (!target_float_same_format_p (from_type, to_type))
|
|
{
|
|
const target_float_ops *ops = get_target_float_ops (from_type, to_type);
|
|
ops->convert (from, from_type, to, to_type);
|
|
return;
|
|
}
|
|
|
|
/* The floating-point formats match, so we simply copy the data, ensuring
|
|
possible padding bytes in the target buffer are zeroed out. */
|
|
memset (to, 0, TYPE_LENGTH (to_type));
|
|
memcpy (to, from, target_float_format_length (to_type));
|
|
}
|
|
|
|
/* Perform the binary operation indicated by OPCODE, using as operands the
|
|
target byte streams X and Y, interpreted as floating-point numbers of
|
|
types TYPE_X and TYPE_Y, respectively. Convert the result to type
|
|
TYPE_RES and store it into the byte-stream RES.
|
|
|
|
The three types must either be all binary floating-point types, or else
|
|
all decimal floating-point types. Binary and decimal floating-point
|
|
types cannot be mixed within a single operation. */
|
|
void
|
|
target_float_binop (enum exp_opcode opcode,
|
|
const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y,
|
|
gdb_byte *res, const struct type *type_res)
|
|
{
|
|
gdb_assert (target_float_same_category_p (type_x, type_res));
|
|
gdb_assert (target_float_same_category_p (type_y, type_res));
|
|
|
|
const target_float_ops *ops = get_target_float_ops (type_x, type_y);
|
|
ops->binop (opcode, x, type_x, y, type_y, res, type_res);
|
|
}
|
|
|
|
/* Compare the two target byte streams X and Y, interpreted as floating-point
|
|
numbers of types TYPE_X and TYPE_Y, respectively. Return zero if X and Y
|
|
are equal, -1 if X is less than Y, and 1 otherwise.
|
|
|
|
The two types must either both be binary floating-point types, or else
|
|
both be decimal floating-point types. Binary and decimal floating-point
|
|
types cannot compared directly against each other. */
|
|
int
|
|
target_float_compare (const gdb_byte *x, const struct type *type_x,
|
|
const gdb_byte *y, const struct type *type_y)
|
|
{
|
|
gdb_assert (target_float_same_category_p (type_x, type_y));
|
|
|
|
const target_float_ops *ops = get_target_float_ops (type_x, type_y);
|
|
return ops->compare (x, type_x, y, type_y);
|
|
}
|
|
|