322 lines
8.5 KiB
Plaintext
322 lines
8.5 KiB
Plaintext
#**************************************************************************
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#* *
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#* OCaml *
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#* *
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#* Damien Doligez, Jane Street Group, LLC *
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#* *
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#* Copyright 2015 Institut National de Recherche en Informatique et *
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#* en Automatique. *
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#* *
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#* All rights reserved. This file is distributed under the terms of *
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#* the GNU Lesser General Public License version 2.1, with the *
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#* special exception on linking described in the file LICENSE. *
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#* *
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#**************************************************************************
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# A set of macros for low-level debugging of OCaml programs and of the
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# OCaml runtime itself (both native and byte-code).
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# This file should be loaded in gdb with [ source gdb-macros ].
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# It defines one command: [caml]
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# Usage:
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# [caml <value>]
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# If <value> is an OCaml value, this will display it in a low-level
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# but legible format, including the header information.
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# To do: a [camlsearch] command to find all (gc-traceable) pointers to
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# a given heap block.
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set $camlwordsize = sizeof(char *)
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if $camlwordsize == 8
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set $caml_unalloc_mask = 0xFF00FFFFFF00FFFF
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set $caml_unalloc_value = 0xD700D7D7D700D6D7
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else
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set $caml_unalloc_mask = 0xFF00FFFF
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set $caml_unalloc_value = 0xD700D6D7
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end
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define camlcheckheader
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if $arg0 >> 10 <= 0 || $arg0 >> 10 >= 0x1000000000000
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if ($arg0 & $caml_unalloc_mask) == $caml_unalloc_value
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set $camlcheckheader_result = 2
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else
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if $arg0 == (unsigned long) 0
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set $camlcheckheader_result = 3
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else
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set $camlcheckheader_result = 1
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end
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end
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else
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set $camlcheckheader_result = 0
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end
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end
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define camlheader
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set $hd = * (unsigned long *) ($arg0 - $camlwordsize)
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set $tag = $hd & 0xFF
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set $color = ($hd >> 8) & 3
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set $size = $hd >> 10
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camlcheckheader $hd
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if $camlcheckheader_result != 0
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if $camlcheckheader_result == 2
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printf "[UNALLOCATED MEMORY]"
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else
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if $camlcheckheader_result == 3
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printf "[** fragment **] 0x%016lu", $hd
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else
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printf "[**invalid header**] 0x%016lu", $hd
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end
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end
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set $size = 0
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else
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printf "["
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if $color == 0
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printf "white "
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end
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if $color == 1
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printf "gray "
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end
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if $color == 2
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printf "blue "
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end
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if $color == 3
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printf "black "
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end
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if $tag < 246
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printf "tag%d ", $tag
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end
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if $tag == 246
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printf "Lazy "
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end
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if $tag == 247
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printf "Closure "
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end
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if $tag == 248
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printf "Object "
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end
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if $tag == 249
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printf "Infix "
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end
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if $tag == 250
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printf "Forward "
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end
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if $tag == 251
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printf "Abstract "
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end
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if $tag == 252
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printf "String "
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end
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if $tag == 253
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printf "Double "
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end
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if $tag == 254
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printf "Double_array "
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end
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if $tag == 255
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printf "Custom "
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end
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printf "%lu]", $size
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end
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end
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define camlheap
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if $arg0 >= caml_young_start && $arg0 < caml_young_end
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printf "YOUNG"
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set $camlheap_result = 1
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else
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set $chunk = caml_heap_start
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set $found = 0
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while $chunk != 0 && ! $found
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set $chunk_size = * (unsigned long *) ($chunk - 2 * $camlwordsize)
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if $arg0 > $chunk && $arg0 <= $chunk + $chunk_size
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printf "OLD"
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set $found = 1
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end
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set $chunk = * (unsigned long *) ($chunk - $camlwordsize)
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end
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if $found
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set $camlheap_result = 1
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else
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printf "OUT-OF-HEAP"
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set $camlheap_result = 0
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end
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end
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end
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define camlint
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if ($arg0 & $caml_unalloc_mask) == $caml_unalloc_value
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printf "UNALLOCATED MEMORY"
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else
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printf "INT %ld", ($arg0 >> 1)
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end
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if ($arg0 & 0xFF) == 0xF9 && ($arg0 >> 10) < 0x1000000000000
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printf " [possible infix header]"
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end
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end
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define camlblock
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printf "%#lx: ", $arg0 - $camlwordsize
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camlheap $arg0
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printf " "
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camlheader $arg0
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set $mysize = $size
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set $camlnext = $arg0 + $camlwordsize * ($size + 1)
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printf "\n"
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if $tag == 252
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x/s $arg0
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end
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if $tag == 253
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x/f $arg0
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end
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if $tag == 254
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while $count < $mysize && $count < 10
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if $count + 1 < $size
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x/2f $arg0 + $camlwordsize * $count
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else
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x/f $arg0 + $camlwordsize * $count
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end
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set $count = $count + 2
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end
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if $count < $mysize
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printf "... truncated ...\n"
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end
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end
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if $tag == 249
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printf "... infix header, displaying enclosing block:\n"
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set $mybaseaddr = $arg0 - $camlwordsize * $mysize
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camlblock $mybaseaddr
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# reset $tag, which was clobbered by the recursive call (yuck)
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set $tag = 249
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end
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if $tag != 249 && $tag != 252 && $tag != 253 && $tag != 254
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set $isvalues = $tag < 251
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set $count = 0
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while $count < $mysize && $count < 10
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set $adr = $arg0 + $camlwordsize * $count
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set $field = * (unsigned long *) $adr
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printf "%#lx: [%d] 0x%016lx ", $adr, $count, $field
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if ($field & 7) == 0 && $isvalues
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camlheap $field
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if $camlheap_result
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printf " "
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camlheader $field
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end
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end
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if ($field & 1) == 1
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camlint $field
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end
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printf "\n"
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set $count = $count + 1
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end
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if $count < $mysize
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printf "... truncated ...\n"
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end
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end
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printf "next block head: %#lx value: %#lx\n", \
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$arg0 + $camlwordsize * $mysize, $arg0 + $camlwordsize * ($mysize+1)
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end
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# displays an OCaml value
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define caml
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set $camllast = (long) $arg0
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if ($camllast & 1) == 1
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set $camlnext = 0
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camlint $camllast
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printf "\n"
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end
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if ($camllast & 7) == 0
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camlblock $camllast
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end
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if ($camllast & 7) != 0 && ($camllast & 1) != 1
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set $camlnext = 0
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printf "invalid pointer: %#016lx\n", $camllast
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end
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end
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# displays the next OCaml value in memory
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define camlnext
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caml $camlnext
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end
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# displays the n-th field of the previously displayed value
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define camlfield
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set $camlfield_addr = ((long *) $camllast)[$arg0]
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caml $camlfield_addr
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end
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# displays the list of heap chunks
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define camlchunks
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set $chunk = * (unsigned long *) &caml_heap_start
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while $chunk != 0
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set $chunk_size = * (unsigned long *) ($chunk - 2 * $camlwordsize)
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set $chunk_alloc = * (unsigned long *) ($chunk - 3 * $camlwordsize)
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printf "chunk: addr = %#lx .. %#lx", $chunk, $chunk + $chunk_size
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printf " (size = %#lx; alloc = %#lx)\n", $chunk_size, $chunk_alloc
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set $chunk = * (unsigned long *) ($chunk - $camlwordsize)
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end
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end
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# walk the heap and launch command `camlvisitfun` on each block
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# the variables `$hp` `$val` `$hd` `$tag` `$color` and `$size`
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# are set before calling `camlvisitfun`
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# `camlvisitfun` can set `$camlvisitstop` to stop the iteration
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define camlvisit
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set $cvchunk = * (unsigned long *) &caml_heap_start
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set $camlvisitstop = 0
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while $cvchunk != 0 && ! $camlvisitstop
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set $cvchunk_size = * (unsigned long *) ($cvchunk - 2 * $camlwordsize)
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set $cvhp = $cvchunk
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while $cvhp < $cvchunk + $cvchunk_size && !$camlvisitstop
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set $hp = $cvhp
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set $val = $hp + $camlwordsize
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set $hd = * (unsigned long *) $hp
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set $tag = $hd & 0xFF
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set $color = ($hd >> 8) & 3
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set $cvsize = $hd >> 10
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set $size = $cvsize
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camlvisitfun
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set $cvhp = $cvhp + (($cvsize + 1) * $camlwordsize)
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end
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set $cvchunk = * (unsigned long *) ($cvchunk - $camlwordsize)
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end
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end
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define caml_cv_check_fl0
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if $hp == * (unsigned long *) &caml_heap_start
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set $flcheck_prev = ((unsigned long) &sentinels + 16)
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end
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if $color == 2 && $size > 5
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if $val != * (unsigned long *) $flcheck_prev
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printf "free-list: missing link %#x -> %#x\n", $flcheck_prev, $val
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set $camlvisitstop = 1
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end
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set $flcheck_prev = $val
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end
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end
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define caml_check_fl
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set $listsize = $arg0
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set $blueseen = $listsize == 0
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set $val = * (unsigned long *) ((long) &sentinels + 16 + 32 * $listsize)
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while $val != 0
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printf "%#x\n", $val
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set $hd = * (unsigned long *) ($val - 8)
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set $color = ($hd >> 8) & 3
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if $blueseen && $color != 2
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printf "non-blue block at address %#x\n", $val
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loop_break
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else
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set $blueseen = 1
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end
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set $val = * (unsigned long *) $val
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end
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end
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