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Add native compiler sanitizer

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* src/comp.c (ABI_VERSION): Bump new version.
(CALL0I): Uncomment.
(helper_link_table, declare_runtime_imported_funcs): Add
'helper_sanitizer_assert'.
(Fcomp__init_ctxt): Register emitter for
'helper_sanitizer_assert'.
(helper_sanitizer_assert): New function.
(syms_of_comp): 'helper_sanitizer_assert' defsym.
(syms_of_comp): 'comp-sanitizer-error' define error.
(syms_of_comp): 'comp-sanitizer-active' defvar.

* lisp/emacs-lisp/comp.el (comp-passes): Add 'comp--sanitizer'.
(comp-sanitizer-emit): Define var.
(comp--sanitizer): Define function.

* lisp/emacs-lisp/comp-run.el (comp-run-async-workers): Forward
'comp-sanitizer-emit'.
This commit is contained in:
Andrea Corallo 2024-02-21 22:31:45 +01:00
parent e72f17e462
commit 0b0c7da8c8
3 changed files with 86 additions and 3 deletions
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46
lisp/emacs-lisp/comp.el
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@ -165,6 +165,7 @@ Can be one of: `d-default', `d-impure' or `d-ephemeral'. See `comp-ctxt'.")
comp--tco
comp--fwprop
comp--remove-type-hints
comp--sanitizer
comp--compute-function-types
comp--final)
"Passes to be executed in order.")
@ -3006,6 +3007,51 @@ These are substituted with a normal `set' op."
(comp--log-func comp-func 3))))
(comp-ctxt-funcs-h comp-ctxt)))
;;; Sanitizer pass specific code.
;; This pass aims to verify compile time value type predictions during
;; execution.
;; The sanitizer pass injects a call to 'helper_sanitizer_assert' before
;; each conditional branch. 'helper_sanitizer_assert' will verify that
;; the variable tested by the conditional branch is of the predicted
;; value type and signal an error otherwise.
(defvar comp-sanitizer-emit nil
"Gates the sanitizer pass.
In use for native compiler development and verification only.")
(defun comp--sanitizer (_)
(when comp-sanitizer-emit
(cl-loop
for f being each hash-value of (comp-ctxt-funcs-h comp-ctxt)
for comp-func = f
unless (comp-func-has-non-local comp-func)
do
(cl-loop
for b being each hash-value of (comp-func-blocks f)
do
(cl-loop
named in-the-basic-block
for insns-seq on (comp-block-insns b)
do (pcase insns-seq
(`((cond-jump ,(and (pred comp-mvar-p) mvar-tested)
,(pred comp-mvar-p) ,_bb1 ,_bb2))
(let ((type (comp-cstr-to-type-spec mvar-tested))
(insn (car insns-seq)))
;; No need to check if type is t.
(unless (eq type t)
(comp--add-const-to-relocs type)
(setcar
insns-seq
(comp--call 'helper_sanitizer_assert
mvar-tested
(make--comp-mvar :constant type)))
(setcdr insns-seq (list insn)))
;; (setf (comp-func-ssa-status comp-func) 'dirty)
(cl-return-from in-the-basic-block))))))
do (comp--log-func comp-func 3))))
;;; Function types pass specific code.