mirror of
https://git.savannah.gnu.org/git/guile.git
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d613ccaaa0
* module/language/cps/compile-bytecode.scm (compile-fun): * module/language/cps/primitives.scm (*branching-primcall-arities*): * module/language/cps/type-fold.scm (logtest): * module/language/cps/types.scm (logtest): * module/system/vm/assembler.scm (system): * module/system/vm/disassembler.scm (compute-labels): Add backend support for the logtest instruction.
588 lines
22 KiB
Scheme
588 lines
22 KiB
Scheme
;;; Guile bytecode disassembler
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;;; Copyright (C) 2001, 2009, 2010, 2012, 2013, 2014 Free Software Foundation, Inc.
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;;;
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;;; This library is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public
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;;; License as published by the Free Software Foundation; either
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;;; version 3 of the License, or (at your option) any later version.
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;;;
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;;; This library 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 GNU
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;;; Lesser General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public
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;;; License along with this library; if not, write to the Free Software
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;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Code:
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(define-module (system vm disassembler)
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#:use-module (language bytecode)
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#:use-module (system vm elf)
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#:use-module (system vm debug)
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#:use-module (system vm program)
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#:use-module (system vm loader)
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#:use-module (system foreign)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:use-module (ice-9 vlist)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-4)
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#:export (disassemble-program
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fold-program-code
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disassemble-image
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disassemble-file
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instruction-length
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instruction-has-fallthrough?
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instruction-relative-jump-targets
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instruction-slot-clobbers))
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(define-syntax-rule (u32-ref buf n)
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(bytevector-u32-native-ref buf (* n 4)))
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(define-syntax-rule (s32-ref buf n)
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(bytevector-s32-native-ref buf (* n 4)))
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(define-syntax visit-opcodes
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(lambda (x)
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(syntax-case x ()
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((visit-opcodes macro arg ...)
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(with-syntax (((inst ...)
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(map (lambda (x) (datum->syntax #'macro x))
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(instruction-list))))
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#'(begin
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(macro arg ... . inst)
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...))))))
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(eval-when (expand compile load eval)
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(define (id-append ctx a b)
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(datum->syntax ctx (symbol-append (syntax->datum a) (syntax->datum b)))))
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(define (unpack-scm n)
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(pointer->scm (make-pointer n)))
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(define (unpack-s24 s)
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(if (zero? (logand s (ash 1 23)))
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s
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(- s (ash 1 24))))
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(define (unpack-s32 s)
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(if (zero? (logand s (ash 1 31)))
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s
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(- s (ash 1 32))))
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(define-syntax disassembler
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(lambda (x)
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(define (parse-first-word word type)
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(with-syntax ((word word))
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(case type
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((U8_X24)
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#'())
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((U8_U24)
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#'((ash word -8)))
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((U8_L24)
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#'((unpack-s24 (ash word -8))))
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((U8_U8_I16)
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#'((logand (ash word -8) #xff)
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(ash word -16)))
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((U8_U12_U12)
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#'((logand (ash word -8) #xfff)
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(ash word -20)))
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((U8_U8_U8_U8)
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#'((logand (ash word -8) #xff)
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(logand (ash word -16) #xff)
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(ash word -24)))
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(else
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(error "bad kind" type)))))
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(define (parse-tail-word word type)
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(with-syntax ((word word))
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(case type
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((U8_X24)
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#'((logand word #ff)))
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((U8_U24)
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#'((logand word #xff)
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(ash word -8)))
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((U8_L24)
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#'((logand word #xff)
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(unpack-s24 (ash word -8))))
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((U32)
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#'(word))
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((I32)
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#'(word))
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((A32)
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#'(word))
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((B32)
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#'(word))
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((N32)
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#'((unpack-s32 word)))
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((S32)
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#'((unpack-s32 word)))
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((L32)
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#'((unpack-s32 word)))
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((LO32)
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#'((unpack-s32 word)))
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((X8_U24)
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#'((ash word -8)))
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((X8_L24)
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#'((unpack-s24 (ash word -8))))
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((B1_X7_L24)
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#'((not (zero? (logand word #x1)))
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(unpack-s24 (ash word -8))))
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((B1_U7_L24)
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#'((not (zero? (logand word #x1)))
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(logand (ash word -1) #x7f)
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(unpack-s24 (ash word -8))))
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((B1_X31)
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#'((not (zero? (logand word #x1)))))
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((B1_X7_U24)
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#'((not (zero? (logand word #x1)))
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(ash word -8)))
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(else
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(error "bad kind" type)))))
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(syntax-case x ()
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((_ name opcode word0 word* ...)
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(let ((vars (generate-temporaries #'(word* ...))))
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(with-syntax (((word* ...) vars)
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((n ...) (map 1+ (iota (length #'(word* ...)))))
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((asm ...)
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(parse-first-word #'first (syntax->datum #'word0)))
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(((asm* ...) ...)
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(map (lambda (word type)
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(parse-tail-word word type))
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vars
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(syntax->datum #'(word* ...)))))
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#'(lambda (buf offset first)
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(let ((word* (u32-ref buf (+ offset n)))
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...)
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(values (+ 1 (length '(word* ...)))
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(list 'name asm ... asm* ... ...))))))))))
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(define (disasm-invalid buf offset first)
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(error "bad instruction" (logand first #xff) first buf offset))
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(define disassemblers (make-vector 256 disasm-invalid))
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(define-syntax define-disassembler
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(lambda (x)
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(syntax-case x ()
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((_ name opcode kind arg ...)
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(with-syntax ((parse (id-append #'name #'parse- #'name)))
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#'(let ((parse (disassembler name opcode arg ...)))
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(vector-set! disassemblers opcode parse)))))))
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(visit-opcodes define-disassembler)
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;; -> len list
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(define (disassemble-one buf offset)
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(let ((first (u32-ref buf offset)))
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((vector-ref disassemblers (logand first #xff)) buf offset first)))
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(define (u32-offset->addr offset context)
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"Given an offset into an image in 32-bit units, return the absolute
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address of that offset."
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(+ (debug-context-base context) (* offset 4)))
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(define (code-annotation code len offset start labels context push-addr!)
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;; FIXME: Print names for register loads and stores that correspond to
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;; access to named locals.
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(define (reference-scm target)
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(unpack-scm (u32-offset->addr (+ offset target) context)))
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(define (dereference-scm target)
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(let ((addr (u32-offset->addr (+ offset target)
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context)))
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(pointer->scm
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(dereference-pointer (make-pointer addr)))))
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(match code
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(((or 'br
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'br-if-nargs-ne 'br-if-nargs-lt 'br-if-nargs-gt
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'br-if-true 'br-if-null 'br-if-nil 'br-if-pair 'br-if-struct
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'br-if-char 'br-if-eq 'br-if-eqv 'br-if-equal
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'br-if-= 'br-if-< 'br-if-<= 'br-if-> 'br-if->=
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'br-if-logtest) _ ... target)
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(list "-> ~A" (vector-ref labels (- (+ offset target) start))))
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(('br-if-tc7 slot invert? tc7 target)
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(list "~A -> ~A"
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(let ((tag (case tc7
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((5) "symbol?")
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((7) "variable?")
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((13) "vector?")
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((15) "string?")
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((77) "bytevector?")
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((95) "bitvector?")
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(else (number->string tc7)))))
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(if invert? (string-append "not " tag) tag))
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(vector-ref labels (- (+ offset target) start))))
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(('prompt tag escape-only? proc-slot handler)
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;; The H is for handler.
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(list "H -> ~A" (vector-ref labels (- (+ offset handler) start))))
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(((or 'make-short-immediate 'make-long-immediate) _ imm)
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(list "~S" (unpack-scm imm)))
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(('make-long-long-immediate _ high low)
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(list "~S" (unpack-scm (logior (ash high 32) low))))
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(('assert-nargs-ee/locals nargs locals)
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;; The nargs includes the procedure.
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(list "~a arg~:p, ~a local~:p" (1- nargs) locals))
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(('tail-call nargs proc)
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(list "~a arg~:p" nargs))
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(('make-closure dst target nfree)
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(let* ((addr (u32-offset->addr (+ offset target) context))
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(pdi (find-program-debug-info addr context))
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(name (or (and pdi (program-debug-info-name pdi))
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"anonymous procedure")))
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(push-addr! addr name)
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(list "~A at #x~X (~A free var~:p)" name addr nfree)))
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(('call-label closure nlocals target)
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(let* ((addr (u32-offset->addr (+ offset target) context))
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(pdi (find-program-debug-info addr context))
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(name (or (and pdi (program-debug-info-name pdi))
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"anonymous procedure")))
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(push-addr! addr name)
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(list "~A at #x~X" name addr)))
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(('tail-call-label nlocals target)
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(let* ((addr (u32-offset->addr (+ offset target) context))
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(pdi (find-program-debug-info addr context))
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(name (or (and pdi (program-debug-info-name pdi))
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"anonymous procedure")))
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(push-addr! addr name)
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(list "~A at #x~X" name addr)))
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(('make-non-immediate dst target)
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(let ((val (reference-scm target)))
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(when (program? val)
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(push-addr! (program-code val) val))
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(list "~@Y" val)))
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(('builtin-ref dst idx)
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(list "~A" (builtin-index->name idx)))
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(((or 'static-ref 'static-set!) _ target)
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(list "~@Y" (dereference-scm target)))
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(((or 'free-ref 'free-set!) _ _ index)
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(list "free var ~a" index))
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(('resolve-module dst name public)
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(list "~a" (if (zero? public) "private" "public")))
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(('toplevel-box _ var-offset mod-offset sym-offset bound?)
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(list "`~A'~A" (dereference-scm sym-offset)
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(if bound? "" " (maybe unbound)")))
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(('module-box _ var-offset mod-name-offset sym-offset bound?)
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(let ((mod-name (reference-scm mod-name-offset)))
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(list "`(~A ~A ~A)'~A" (if (car mod-name) '@ '@@) (cdr mod-name)
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(dereference-scm sym-offset)
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(if bound? "" " (maybe unbound)"))))
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(('load-typed-array dst type shape target len)
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(let ((addr (u32-offset->addr (+ offset target) context)))
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(list "~a bytes from #x~X" len addr)))
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(_ #f)))
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(define (compute-labels bv start end)
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(let ((labels (make-vector (- end start) #f)))
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(define (add-label! pos header)
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(unless (vector-ref labels (- pos start))
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(vector-set! labels (- pos start) header)))
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(let lp ((offset start))
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(when (< offset end)
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(call-with-values (lambda () (disassemble-one bv offset))
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(lambda (len elt)
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(match elt
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((inst arg ...)
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(case inst
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((br
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br-if-nargs-ne br-if-nargs-lt br-if-nargs-gt
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br-if-true br-if-null br-if-nil br-if-pair br-if-struct
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br-if-char br-if-tc7 br-if-eq br-if-eqv br-if-equal
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br-if-= br-if-< br-if-<= br-if-> br-if->= br-if-logtest)
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(match arg
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((_ ... target)
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(add-label! (+ offset target) "L"))))
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((prompt)
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(match arg
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((_ ... target)
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(add-label! (+ offset target) "H")))))))
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(lp (+ offset len))))))
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(let lp ((offset start) (n 1))
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(when (< offset end)
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(let* ((pos (- offset start))
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(label (vector-ref labels pos)))
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(if label
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(begin
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(vector-set! labels
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pos
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(string->symbol
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(string-append label (number->string n))))
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(lp (1+ offset) (1+ n)))
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(lp (1+ offset) n)))))
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labels))
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(define (print-info port addr label info extra src)
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(when label
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(format port "~A:\n" label))
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(format port "~4@S ~32S~@[;; ~1{~@?~}~]~@[~61t at ~a~]\n"
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addr info extra src))
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(define (disassemble-buffer port bv start end context push-addr!)
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(let ((labels (compute-labels bv start end))
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(sources (find-program-sources (u32-offset->addr start context)
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context)))
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(define (lookup-source addr)
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(let lp ((sources sources))
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(match sources
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(() #f)
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((source . sources)
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(let ((pc (source-pre-pc source)))
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(cond
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((< pc addr) (lp sources))
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((= pc addr)
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(format #f "~a:~a:~a"
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(or (source-file source) "(unknown file)")
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(source-line-for-user source)
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(source-column source)))
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(else #f)))))))
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(let lp ((offset start))
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(when (< offset end)
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(call-with-values (lambda () (disassemble-one bv offset))
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(lambda (len elt)
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(let ((pos (- offset start))
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(addr (u32-offset->addr offset context))
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(annotation (code-annotation elt len offset start labels
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context push-addr!)))
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(print-info port pos (vector-ref labels pos) elt annotation
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(lookup-source addr))
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(lp (+ offset len)))))))))
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(define* (disassemble-addr addr label port #:optional (seen (make-hash-table)))
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(format port "Disassembly of ~A at #x~X:\n\n" label addr)
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(cond
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((find-program-debug-info addr)
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=> (lambda (pdi)
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(let ((worklist '()))
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(define (push-addr! addr label)
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(unless (hashv-ref seen addr)
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(hashv-set! seen addr #t)
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(set! worklist (acons addr label worklist))))
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(disassemble-buffer port
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(program-debug-info-image pdi)
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(program-debug-info-u32-offset pdi)
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(program-debug-info-u32-offset-end pdi)
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(program-debug-info-context pdi)
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push-addr!)
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(for-each (match-lambda
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((addr . label)
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(display "\n----------------------------------------\n"
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port)
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(disassemble-addr addr label port seen)))
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worklist))))
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(else
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(format port "Debugging information unavailable.~%")))
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(values))
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(define* (disassemble-program program #:optional (port (current-output-port)))
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(disassemble-addr (program-code program) program port))
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(define (fold-code-range proc seed bv start end context raw?)
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(define (cook code offset)
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(define (reference-scm target)
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(unpack-scm (u32-offset->addr (+ offset target) context)))
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(define (dereference-scm target)
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(let ((addr (u32-offset->addr (+ offset target)
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context)))
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(pointer->scm
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(dereference-pointer (make-pointer addr)))))
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(match code
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(((or 'make-short-immediate 'make-long-immediate) dst imm)
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`(,(car code) ,dst ,(unpack-scm imm)))
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(('make-long-long-immediate dst high low)
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`(make-long-long-immediate ,dst
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,(unpack-scm (logior (ash high 32) low))))
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(('make-closure dst target nfree)
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`(make-closure ,dst
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,(u32-offset->addr (+ offset target) context)
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,nfree))
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(('make-non-immediate dst target)
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`(make-non-immediate ,dst ,(reference-scm target)))
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(('builtin-ref dst idx)
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`(builtin-ref ,dst ,(builtin-index->name idx)))
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(((or 'static-ref 'static-set!) dst target)
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`(,(car code) ,dst ,(dereference-scm target)))
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(('toplevel-box dst var-offset mod-offset sym-offset bound?)
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`(toplevel-box ,dst
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,(dereference-scm var-offset)
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,(dereference-scm mod-offset)
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,(dereference-scm sym-offset)
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,bound?))
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(('module-box dst var-offset mod-name-offset sym-offset bound?)
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(let ((mod-name (reference-scm mod-name-offset)))
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`(module-box ,dst
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,(dereference-scm var-offset)
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,(car mod-name)
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,(cdr mod-name)
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,(dereference-scm sym-offset)
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,bound?)))
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(_ code)))
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(let lp ((offset start) (seed seed))
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(cond
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((< offset end)
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(call-with-values (lambda () (disassemble-one bv offset))
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(lambda (len elt)
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(lp (+ offset len)
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(proc (if raw? elt (cook elt offset))
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seed)))))
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(else seed))))
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(define* (fold-program-code proc seed program-or-addr #:key raw?)
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(cond
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((find-program-debug-info (if (program? program-or-addr)
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(program-code program-or-addr)
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program-or-addr))
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=> (lambda (pdi)
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(fold-code-range proc seed
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(program-debug-info-image pdi)
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(program-debug-info-u32-offset pdi)
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(program-debug-info-u32-offset-end pdi)
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(program-debug-info-context pdi)
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raw?)))
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(else seed)))
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(define* (disassemble-image bv #:optional (port (current-output-port)))
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(let* ((ctx (debug-context-from-image bv))
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(base (debug-context-text-base ctx)))
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(for-each-elf-symbol
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ctx
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(lambda (sym)
|
|
(let ((name (elf-symbol-name sym))
|
|
(value (elf-symbol-value sym))
|
|
(size (elf-symbol-size sym)))
|
|
(format port "Disassembly of ~A at #x~X:\n\n"
|
|
(if (and (string? name) (not (string-null? name)))
|
|
name
|
|
"<unnamed function>")
|
|
(+ base value))
|
|
(disassemble-buffer port
|
|
bv
|
|
(/ (+ base value) 4)
|
|
(/ (+ base value size) 4)
|
|
ctx
|
|
(lambda (addr name) #t))
|
|
(display "\n\n" port)))))
|
|
(values))
|
|
|
|
(define (disassemble-file file)
|
|
(let* ((thunk (load-thunk-from-file file))
|
|
(elf (find-mapped-elf-image (program-code thunk))))
|
|
(disassemble-image elf)))
|
|
|
|
(define-syntax instruction-lengths-vector
|
|
(lambda (x)
|
|
(syntax-case x ()
|
|
((_)
|
|
(let ((lengths (make-vector 256 #f)))
|
|
(for-each (match-lambda
|
|
((name opcode kind words ...)
|
|
(vector-set! lengths opcode (* 4 (length words)))))
|
|
(instruction-list))
|
|
(datum->syntax x lengths))))))
|
|
|
|
(define (instruction-length code pos)
|
|
(let ((opcode (logand (bytevector-u32-native-ref code pos) #xff)))
|
|
(or (vector-ref (instruction-lengths-vector) opcode)
|
|
(error "Unknown opcode" opcode))))
|
|
|
|
(define-syntax static-opcode-set
|
|
(lambda (x)
|
|
(define (instruction-opcode inst)
|
|
(cond
|
|
((assq inst (instruction-list))
|
|
=> (match-lambda ((name opcode . _) opcode)))
|
|
(else
|
|
(error "unknown instruction" inst))))
|
|
|
|
(syntax-case x ()
|
|
((static-opcode-set inst ...)
|
|
(let ((bv (make-bitvector 256 #f)))
|
|
(for-each (lambda (inst)
|
|
(bitvector-set! bv (instruction-opcode inst) #t))
|
|
(syntax->datum #'(inst ...)))
|
|
(datum->syntax #'static-opcode-set bv))))))
|
|
|
|
(define (instruction-has-fallthrough? code pos)
|
|
(define non-fallthrough-set
|
|
(static-opcode-set halt
|
|
tail-call tail-call-label tail-call/shuffle
|
|
return return-values
|
|
subr-call foreign-call continuation-call
|
|
tail-apply
|
|
br))
|
|
(let ((opcode (logand (bytevector-u32-native-ref code pos) #xff)))
|
|
(not (bitvector-ref non-fallthrough-set opcode))))
|
|
|
|
(define-syntax define-jump-parser
|
|
(lambda (x)
|
|
(syntax-case x ()
|
|
((_ name opcode kind word0 word* ...)
|
|
(let ((symname (syntax->datum #'name)))
|
|
(if (or (memq symname '(br prompt))
|
|
(string-prefix? "br-" (symbol->string symname)))
|
|
(let ((offset (* 4 (length #'(word* ...)))))
|
|
#`(vector-set!
|
|
jump-parsers
|
|
opcode
|
|
(lambda (code pos)
|
|
(let ((target
|
|
(bytevector-s32-native-ref code (+ pos #,offset))))
|
|
;; Assume that the target is in the last word, as
|
|
;; an L24 in the high bits.
|
|
(list (* 4 (ash target -8)))))))
|
|
#'(begin)))))))
|
|
|
|
(define jump-parsers (make-vector 256 (lambda (code pos) '())))
|
|
(visit-opcodes define-jump-parser)
|
|
|
|
(define (instruction-relative-jump-targets code pos)
|
|
(let ((opcode (logand (bytevector-u32-native-ref code pos) #xff)))
|
|
((vector-ref jump-parsers opcode) code pos)))
|
|
|
|
(define-syntax define-clobber-parser
|
|
(lambda (x)
|
|
(syntax-case x ()
|
|
((_ name opcode kind arg ...)
|
|
(case (syntax->datum #'kind)
|
|
((!)
|
|
(case (syntax->datum #'name)
|
|
((call call-label)
|
|
#'(let ((parse (lambda (code pos nslots)
|
|
(call-with-values
|
|
(lambda ()
|
|
(disassemble-one code (/ pos 4)))
|
|
(lambda (len elt)
|
|
(match elt
|
|
((_ proc . _)
|
|
(let lp ((slot (- proc 2)))
|
|
(if (< slot nslots)
|
|
(cons slot (lp (1+ slot)))
|
|
'())))))))))
|
|
(vector-set! clobber-parsers opcode parse)))
|
|
(else
|
|
#'(begin))))
|
|
((<-)
|
|
#'(let ((parse (lambda (code pos nslots)
|
|
(call-with-values
|
|
(lambda ()
|
|
(disassemble-one code (/ pos 4)))
|
|
(lambda (len elt)
|
|
(match elt
|
|
((_ dst . _) (list dst))))))))
|
|
(vector-set! clobber-parsers opcode parse)))
|
|
(else (error "unexpected instruction kind" #'kind)))))))
|
|
|
|
(define clobber-parsers (make-vector 256 (lambda (code pos nslots) '())))
|
|
(visit-opcodes define-clobber-parser)
|
|
|
|
(define (instruction-slot-clobbers code pos nslots)
|
|
(let ((opcode (logand (bytevector-u32-native-ref code pos) #xff)))
|
|
((vector-ref clobber-parsers opcode) code pos nslots)))
|