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Add interface to read .debug_line data
* module/system/vm/dwarf.scm (die-line-prog): (line-prog-advance, line-prog-scan-to-pc): New public interfaces, allowing clients to interpret the "statement programs" from .debug_line DWARF sections. (<meta>, elf->dwarf-context): Record the bounds of the .debug_line section.
This commit is contained in:
Andy Wingo
parent
d56ab5a913
commit
1ed81e0229
1 changed files with 252 additions and 4 deletions
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@ -104,10 +104,12 @@
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die? die-ctx die-offset die-abbrev die-vals die-children
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die-tag die-attrs die-forms die-ref
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die-name die-specification die-qname
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die-name die-specification die-qname die-low-pc die-high-pc
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ctx-parent ctx-die ctx-start ctx-end ctx-children ctx-language
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die-line-prog line-prog-advance line-prog-scan-to-pc
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find-die-context find-die-by-offset find-die find-die-by-pc
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read-die fold-die-list
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@ -712,6 +714,7 @@
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abbrevs-start abbrevs-end
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strtab-start strtab-end
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loc-start loc-end
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line-start line-end
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pubnames-start pubnames-end
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aranges-start aranges-end)
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dwarf-meta?
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@ -728,6 +731,8 @@
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(strtab-end meta-strtab-end)
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(loc-start meta-loc-start)
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(loc-end meta-loc-end)
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(line-start meta-line-start)
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(line-end meta-line-end)
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(pubnames-start meta-pubnames-start)
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(pubnames-end meta-pubnames-end)
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(aranges-start meta-aranges-start)
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@ -769,6 +774,9 @@
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(define (read-u8 ctx pos)
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(values (bytevector-u8-ref (ctx-bv ctx) pos)
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(1+ pos)))
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(define (read-s8 ctx pos)
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(values (bytevector-s8-ref (ctx-bv ctx) pos)
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(1+ pos)))
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(define (skip-8 ctx pos)
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(+ pos 1))
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@ -886,6 +894,14 @@
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(1+ end)
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(lp (1+ end))))))
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(define (read-string-seq ctx pos)
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(let ((bv (ctx-bv ctx)))
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(let lp ((pos pos) (strs '()))
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(if (zero? (bytevector-u8-ref bv pos))
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(values (list->vector (reverse strs)) (1+ pos))
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(let-values (((str pos) (read-string ctx pos)))
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(lp pos (cons str strs)))))))
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(define-record-type <abbrev>
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(make-abbrev code tag has-children? attrs forms)
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abbrev?
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@ -1185,6 +1201,213 @@
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(else
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(parse-location-list ctx loc))))
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;; Statement programs.
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(define-record-type <lregs>
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(make-lregs pos pc file line column)
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lregs?
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(pos lregs-pos set-lregs-pos!)
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(pc lregs-pc set-lregs-pc!)
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(file lregs-file set-lregs-file!)
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(line lregs-line set-lregs-line!)
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(column lregs-column set-lregs-column!))
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(define-record-type <line-prog>
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(%make-line-prog ctx version
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header-offset program-offset end
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min-insn-length max-insn-ops default-stmt?
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line-base line-range opcode-base
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standard-opcode-lengths
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include-directories file-names
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regs)
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line-prog?
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(ctx line-prog-ctx)
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(version line-prog-version)
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(header-offset line-prog-header-offset)
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(program-offset line-prog-program-offset)
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(end line-prog-end)
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(min-insn-length line-prog-min-insn-length)
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(max-insn-ops line-prog-max-insn-ops)
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(default-stmt? line-prog-default-stmt?)
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(line-base line-prog-line-base)
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(line-range line-prog-line-range)
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(opcode-base line-prog-opcode-base)
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(standard-opcode-lengths line-prog-standard-opcode-lengths)
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(include-directories line-prog-include-directories)
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(file-names line-prog-file-names)
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(regs line-prog-regs))
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(define (make-line-prog ctx header-pos end)
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(unless (> end (+ header-pos 12))
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(error "statement program header too short"))
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(let-values (((len pos offset-size) (read-initial-length ctx header-pos)))
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(unless (<= (+ pos len) end)
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(error (".debug_line too short")))
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(let*-values (((version pos) (read-u16 ctx pos))
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((prologue-len prologue-pos) (read-u32 ctx pos))
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((min-insn-len pos) (read-u8 ctx prologue-pos))
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;; The maximum_operations_per_instruction field is
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;; only present in DWARFv4.
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((max-insn-ops pos) (if (< version 4)
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(values 1 pos)
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(read-u8 ctx pos)))
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((default-stmt pos) (read-u8 ctx pos))
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((line-base pos) (read-s8 ctx pos))
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((line-range pos) (read-u8 ctx pos))
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((opcode-base pos) (read-u8 ctx pos))
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((opcode-lens pos) (read-block ctx pos (1- opcode-base)))
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((include-directories pos) (read-string-seq ctx pos))
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((file-names pos)
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(let lp ((pos pos) (strs '()))
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(if (zero? (bytevector-u8-ref (ctx-bv ctx) pos))
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(values (reverse strs) (1+ pos))
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(let-values (((str pos) (read-string ctx pos)))
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(let* ((pos (skip-leb128 ctx pos)) ; skip dir
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(pos (skip-leb128 ctx pos)) ; skip mtime
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(pos (skip-leb128 ctx pos))) ; skip len
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(lp pos (cons str strs))))))))
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(unless (= pos (+ prologue-pos prologue-len))
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(error "unexpected prologue length"))
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(%make-line-prog ctx version header-pos pos end
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min-insn-len max-insn-ops (not (zero? default-stmt))
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line-base line-range opcode-base opcode-lens
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include-directories file-names
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;; Initial state: file=1, line=1, col=0
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(make-lregs pos 0 1 1 0)))))
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(define (line-prog-next-row prog pos pc file line col)
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(let ((ctx (line-prog-ctx prog))
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(end (line-prog-end prog))
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(min-insn-len (line-prog-min-insn-length prog))
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(line-base (line-prog-line-base prog))
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(line-range (line-prog-line-range prog))
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(opcode-base (line-prog-opcode-base prog))
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(opcode-lens (line-prog-standard-opcode-lengths prog)))
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(let lp ((pos pos) (pc pc) (file file) (line line) (col col))
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(cond
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((>= pos end)
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(values #f #f #f #f #f))
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(else
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(let-values (((op pos) (read-u8 ctx pos)))
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(cond
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((zero? op) ; extended opcodes
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(let*-values (((len pos*) (read-uleb128 ctx pos))
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((op pos) (read-u8 ctx pos*)))
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(case op
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((1) ; end-sequence
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(values pos pc file line col))
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((2) ; set-address
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(let-values (((addr pos) (read-addr ctx pos)))
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(unless (>= addr pc)
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(error "pc not advancing"))
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(lp pos addr file line col)))
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((3) ; define-file
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(warn "define-file unimplemented")
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(lp (+ pos* len) pc file line col))
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((4) ; set-discriminator; ignore.
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(lp (+ pos* len) pc file line col))
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(else
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(warn "unknown extended op" op)
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(lp (+ pos* len) pc file line col)))))
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((< op opcode-base) ; standard opcodes
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(case op
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((1) ; copy
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(values pos pc file line col))
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((2) ; advance-pc
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(let-values (((advance pos) (read-uleb128 ctx pos)))
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(lp pos (+ pc (* advance min-insn-len)) file line col)))
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((3) ; advance-line
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(let-values (((diff pos) (read-sleb128 ctx pos)))
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(lp pos pc file (+ line diff) col)))
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((4) ; set-file
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(let-values (((file pos) (read-uleb128 ctx pos)))
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(lp pos pc file line col)))
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((5) ; set-column
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(let-values (((col pos) (read-uleb128 ctx pos)))
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(lp pos pc file line col)))
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((6) ; negate-line
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(lp pos pc file line col))
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((7) ; set-basic-block
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(lp pos pc file line col))
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((8) ; const-add-pc
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(let ((advance (floor/ (- 255 opcode-base) line-range)))
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(lp pos (+ pc (* advance min-insn-len)) file line col)))
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((9) ; fixed-advance-pc
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(let-values (((advance pos) (read-u16 ctx pos)))
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(lp pos (+ pc (* advance min-insn-len)) file line col)))
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(else
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;; fixme: read args and move on
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(error "unknown extended op" op))))
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(else ; special opcodes
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(let-values (((quo rem) (floor/ (- op opcode-base) line-range)))
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(values pos (+ pc (* quo min-insn-len))
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file (+ line (+ rem line-base)) col))))))))))
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(define (line-prog-advance prog)
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(let ((regs (line-prog-regs prog)))
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(call-with-values (lambda ()
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(line-prog-next-row prog
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(lregs-pos regs)
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(lregs-pc regs)
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(lregs-file regs)
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(lregs-line regs)
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(lregs-column regs)))
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(lambda (pos pc file line col)
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(cond
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((not pos)
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(values #f #f #f #f))
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(else
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(set-lregs-pos! regs pos)
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(set-lregs-pc! regs pc)
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(set-lregs-file! regs file)
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(set-lregs-line! regs line)
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(set-lregs-column! regs col)
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;; Return DWARF-numbered lines and columns (1-based).
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(values pc
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(if (zero? file)
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#f
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(list-ref (line-prog-file-names prog) (1- file)))
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(if (zero? line) #f line)
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(if (zero? col) #f col))))))))
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(define (line-prog-scan-to-pc prog target-pc)
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(let ((regs (line-prog-regs prog)))
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(define (finish pos pc file line col)
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(set-lregs-pos! regs pos)
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(set-lregs-pc! regs pc)
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(set-lregs-file! regs file)
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(set-lregs-line! regs line)
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(set-lregs-column! regs col)
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;; Return DWARF-numbered lines and columns (1-based).
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(values pc
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(if (zero? file)
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#f
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(list-ref (line-prog-file-names prog) (1- file)))
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(if (zero? line) #f line)
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(if (zero? col) #f col)))
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(define (scan pos pc file line col)
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(call-with-values (lambda ()
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(line-prog-next-row prog pos pc file line col))
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(lambda (pos* pc* file* line* col*)
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(cond
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((not pos*)
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(values #f #f #f #f))
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((< pc* target-pc)
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(scan pos* pc* file* line* col*))
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((= pc* target-pc)
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(finish pos* pc* file* line* col*))
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(else
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(finish pos pc file line col))))))
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(let ((pos (lregs-pos regs))
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(pc (lregs-pc regs))
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(file (lregs-file regs))
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(line (lregs-line regs))
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(col (lregs-column regs)))
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(if (< pc target-pc)
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(scan pos pc file line col)
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(scan (line-prog-program-offset prog) 0 1 1 0)))))
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(define-syntax-rule (define-attribute-parsers parse (name parser) ...)
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(define parse
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(let ((parsers (make-hash-table)))
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@ -1266,6 +1489,15 @@
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=> die-qname)
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(else #f)))
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(define (die-line-prog die)
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(let ((stmt-list (die-ref die 'stmt-list)))
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(and stmt-list
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(let* ((ctx (die-ctx die))
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(meta (ctx-meta ctx)))
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(make-line-prog ctx
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(+ (meta-line-start meta) stmt-list)
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(meta-line-end meta))))))
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(define (read-values ctx offset abbrev)
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(let lp ((attrs (abbrev-attrs abbrev))
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(forms (abbrev-forms abbrev))
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@ -1377,6 +1609,16 @@
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(for-each visit-die roots)
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#f))
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(define (die-low-pc die)
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(die-ref die 'low-pc))
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(define (die-high-pc die)
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(let ((val (die-ref die 'high-pc)))
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(and val
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(let ((idx (list-index (die-attrs die) 'high-pc)))
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(case (list-ref (die-forms die) idx)
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((addr) val)
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(else (+ val (die-low-pc die))))))))
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(define (find-die-by-pc roots pc)
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;; The result will be a subprogram.
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(define (skip? ctx offset abbrev)
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@ -1386,15 +1628,15 @@
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(define (recurse? die)
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(case (die-tag die)
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((compile-unit)
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(not (or (and=> (die-ref die 'low-pc)
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(not (or (and=> (die-low-pc die)
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(lambda (low) (< pc low)))
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(and=> (die-ref die 'high-pc)
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(and=> (die-high-pc die)
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(lambda (high) (<= high pc))))))
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(else #f)))
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(find-die roots
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(lambda (die)
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(and (eq? (die-tag die) 'subprogram)
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(equal? (die-ref die 'low-pc) pc)))
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(equal? (die-low-pc die) pc)))
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#:skip? skip? #:recurse? recurse?))
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(define (fold-die-list ctx offset skip? proc seed)
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@ -1555,6 +1797,7 @@
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(abbrevs (assoc-ref sections ".debug_abbrev"))
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(strtab (assoc-ref sections ".debug_str"))
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(loc (assoc-ref sections ".debug_loc"))
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(line (assoc-ref sections ".debug_line"))
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(pubnames (assoc-ref sections ".debug_pubnames"))
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(aranges (assoc-ref sections ".debug_aranges")))
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(make-dwarf-context (elf-bytes elf)
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@ -1576,6 +1819,11 @@
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(elf-section-offset loc)
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(+ (elf-section-offset loc)
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(elf-section-size loc))
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(and line
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(elf-section-offset line))
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(and line
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(+ (elf-section-offset line)
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(elf-section-size line)))
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(and pubnames
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(elf-section-offset pubnames))
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(and pubnames
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