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gheap-jemalloc.scm
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gheap-jemalloc.scm
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; -----
; This file is part of gheap-jemalloc and is lincensed under the gplv3+ license
; See the COPYING file for details
;
; GDB jemalloc-5.3.0 Plugin for the standalone jemalloc for gnu/linux
; Version: 1.0.0
; License: GPLv3
; Author: Ernest Deak
;
; ,
; -+-
; 1
; -----
(use-modules (gdb) (ice-9 format) (oop goops))
(define println (lambda (str) (format #t "~a~%" str)))
(define neat-print (lambda (ls)
(println (string-join ls))))
(define neat-eval (lambda (expression)
(value-print (parse-and-eval expression))))
(define MAJOR_VERSION 1)
(define MINOR_VERSION 0)
(define PATCH_VERSION 0)
(define VERSION_STRING (format #f "~a.~a.~a" MAJOR_VERSION MINOR_VERSION PATCH_VERSION))
; ==== symbol related ========================================{{{
;setup for future and past symbol changes
(define get-jemalloc-version (lambda () "5.3.0")) ; hardcoded for now. will be replaced by some function that checks for the version
; === jemalloc's edata structure === {{{
(define-class <edata-generic> ()
(e_addr #:init-value "ERROR")
(e_bits #:init-value "ERROR"))
(define-class <edata-5.3.0> (<edata-generic>)
(e_addr #:init-value "e_addr")
(e_bits #:init-value "e_bits"))
; e_bits specific functions{{{
(define e_bits-arena_ind
(lambda (b)
(bit-extract b 0 12)))
(define e_bits-slab
(lambda (b)
(bit-extract b 12 13)))
(define e_bits-commited
(lambda (b)
(bit-extract b 13 14)))
(define e_bits-pai
(lambda (b)
(bit-extract b 14 15)))
(define e_bits-zeroed
(lambda (b)
(bit-extract b 15 16)))
(define e_bits-guarded
(lambda (b)
(bit-extract b 16 17)))
(define e_bits-state
(lambda (b)
(bit-extract b 17 20)))
(define e_bits-szind
(lambda (b)
(bit-extract b 20 28)))
(define e_bits-nfree
(lambda (b)
(bit-extract b 28 38)))
(define e_bits-bin_shard
(lambda (b)
(bit-extract b 38 44)))
(define-class <edata-bitfield-struct> ()
(arena_ind)
(slab)
(commited)
(pai)
(zeroed)
(guarded)
(state)
(szind)
(nfree)
(bin_shard))
; --------------------------------------------------------------------------------------------------------------------------------------------
; indexes of individual bits for e_bits bitfield because it was kind of hard to keep track of just in my head
; explanation of these letters can be found in jemalloc's source: jemalloc-5.3.0/include/jemalloc/internal/edata.h
;
; 15 14 13 12 11 10 9 8 76543210
; z p c b a a a a aaaaaaaa
; 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
; f f f f i i i i i i i i t t t g
; 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
; 0 0 0 0 s s s s s s f f f f f f
; --------------------------------------------------------------------------------------------------------------------------------------------
;}}}
(define get-edata-for-version
(lambda (v)
(cond
(#nil (make <edata-5.3.0>))
((equal? v "5.3.0") (make <edata-5.3.0>)))))
(define-method (edata_t-sym (edata <edata-generic>) (sym <symbol>))
(slot-ref edata sym))
(define edata_s (get-edata-for-version (get-jemalloc-version)))
;}}}
; === jemalloc specific symbols and functions ===={{{
(define-class <jemalloc-symbols-generic> ()
(arena #:init-keyword #:arena)
(slabcur #:init-keyword #:slabcur)
(bins #:init-keyword #:bins)
(nbins #:init-keyword #:nbins)
(narenas #:init-keyword #:narenas))
(define-method (je-sym (je <jemalloc-symbols-generic>) (sym <symbol>))
(slot-ref je sym))
(define-class <jemalloc-symbols-5.3.0> (<jemalloc-symbols-generic>))
(define je (make-instance <jemalloc-symbols-5.3.0>
#:arena "a0"
#:slabcur "slabcur"
#:bins "bins"
#:nbins "nbins_total"
#:narenas "narenas_total"))
;}}}
; Symbol defines {{{
(define SYM_arena (je-sym je 'arena))
(define SYM_arena_bin (je-sym je 'bins))
(define SYM_slabcur (je-sym je 'slabcur))
(define arena-bins (format #f "~a.~a" SYM_arena SYM_arena_bin))
(define SYM_nbins_total (je-sym je 'nbins))
(define SYM_narenas_total (je-sym je 'narenas))
(define SYM_edata_t "edata_t")
(define bin_struct_size_bytes 224)
(define bin_struct_size_qwords 28)
;}}}
; === defines for symbols with formats ==={{{
; returns a gdb:value, this should represent an address
(define arena-bins-at (lambda (idx) (parse-and-eval (format #f "~a[~a]" arena-bins idx))))
(define arena-bins-field-at (lambda (idx field) (parse-and-eval (format #f "~a[~a].~a" arena-bins idx field))))
(define arena-bins-slab-field-at (lambda (idx slab_subfield) (parse-and-eval (format #f "~a[~a].~a.~a" arena-bins idx SYM_slabcur slab_subfield))))
(define arena-slab-info (lambda (slabaddr) (execute (format #f "p -pretty on -- *(edata_t *) ~a" slabaddr))))
;==============================================================
;}}}
;}}}
(define nbins_total (lambda ()
(neat-eval SYM_nbins_total)))
(define narenas_total (lambda ()
(neat-eval (format #f "~a->repr" SYM_narenas_total))))
(define alltostr (lambda (ls)
(string-join (map (lambda (e)
(if (value? e)
(value-print e)
(format #f "~a" e))
) ls))))
(define slab-field-ref
(lambda (slabaddr field_str) ; slabaddr is expected to be just an integer or hex number representing an address, field_str is just the field as a string
(let ((slabfmt (format #f "((~a *) ~a)" SYM_edata_t slabaddr)))
(parse-and-eval (format #f "~a.~a" slabfmt field_str)))))
(define DEBUG #t)
(define dbg
(lambda (str form)
(if (eq? DEBUG #t)
(begin (format #t "~a~%" str) (form))
(form))))
(define-syntax slabfield
(syntax-rules (-> as)
((slabfield slabaddr -> fieldname as vprinttype)
(vprinttype (slab-field-ref slabaddr fieldname)))
))
(define show-slab-info
(lambda (slabaddr)
(format #t " `-> e_addr: ~a ~%" (slabfield slabaddr -> "e_addr" as value-print))
(format #t " `-> e_bits: 0x~x ~%" (slabfield slabaddr -> "e_bits" as value->integer))
(format #t " | ~30a: 0x~x ~%" "ARENA INDEX" (e_bits-arena_ind (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "SLAB" (e_bits-slab (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "COMMITED" (e_bits-commited (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "PAI" (e_bits-pai (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "ZEROED" (e_bits-zeroed (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "GUARDED" (e_bits-guarded (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "STATE" (e_bits-state (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: ~d ~%" "USABLE SIZE CLASS INDEX" (e_bits-szind (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: ~d ~%" "FREE REGIONS IN SLAB" (e_bits-nfree (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " | ~30a: 0x~x ~%" "BIN SHARD" (e_bits-bin_shard (slabfield slabaddr -> "e_bits" as value->integer)))
(format #t " `----------------------------------- ~%")
))
(define show-all-slabs (lambda (x)
(if (< x (string->number (nbins_total)))
(begin
(format #t "bin[~a]: ~%" x)
(format #t " `-> slabcur: ~a ~%" (value-print (arena-bins-field-at x SYM_slabcur)))
(let ((slabaddr (parse-and-eval (format #f "a0.bins[~a].slabcur" x))))
(if (not (= (value->integer slabaddr) 0))
(show-slab-info slabaddr)
))
(show-all-slabs (+ x 1))))))
; ===== command registration section ====={{{
(let ((newcmd (make-command "jearena"
#:command-class COMMAND_OBSCURE
#:doc "Show the jemalloc arena struct + address"
#:invoke (lambda (self arg from-tty)
(execute (format #f "p -object on -array on -pretty on -- *~a" SYM_arena))
(neat-print (list SYM_arena ": " (neat-eval SYM_arena) )))
)))
(register-command! newcmd))
(register-command! (make-command "jeslabs"
#:command-class COMMAND_OBSCURE
#:doc "Display all slabs(runs) currently defined in the arena with their information"
#:invoke (lambda (self arg from-tty) (show-all-slabs 0))))
(register-command! (make-command "jeslab"
#:command-class COMMAND_OBSCURE
#:doc "Show information about a slab"
#:invoke (lambda (self arg from-tty)
(show-slab-info arg))))
(register-command! (make-command "je_narenas_total" #:command-class COMMAND_OBSCURE #:invoke (lambda (self arg tty) (println (narenas_total)))))
(register-command! (make-command "je_nbins_total" #:command-class COMMAND_OBSCURE #:invoke (lambda (self arg tty) (println (nbins_total)))))
;}}}