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debug/gosym: add pcHeader parsing helpers

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A subsequent change will duplicate most of case ver116.
Make it easier to read.

Change-Id: I3a93181c7f094b12715b8a618e9efef7a1438a27
Reviewed-on: https://go-review.googlesource.com/c/go/+/351909
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Josh Bleecher Snyder 2021-09-22 11:13:20 -07:00
parent 7887313879
commit 45134acbe6
1 changed files with 15 additions and 13 deletions
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28
src/debug/gosym/pclntab.go
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@ -225,21 +225,23 @@ func (t *LineTable) parsePclnTab() {
t.quantum = uint32(t.Data[6])
t.ptrsize = uint32(t.Data[7])
offset := func(word uint32) uint64 {
return t.uintptr(t.Data[8+word*t.ptrsize:])
}
data := func(word uint32) []byte {
return t.Data[offset(word):]
}
switch possibleVersion {
case ver116:
t.nfunctab = uint32(t.uintptr(t.Data[8:]))
t.nfiletab = uint32(t.uintptr(t.Data[8+t.ptrsize:]))
offset := t.uintptr(t.Data[8+2*t.ptrsize:])
t.funcnametab = t.Data[offset:]
offset = t.uintptr(t.Data[8+3*t.ptrsize:])
t.cutab = t.Data[offset:]
offset = t.uintptr(t.Data[8+4*t.ptrsize:])
t.filetab = t.Data[offset:]
offset = t.uintptr(t.Data[8+5*t.ptrsize:])
t.pctab = t.Data[offset:]
offset = t.uintptr(t.Data[8+6*t.ptrsize:])
t.funcdata = t.Data[offset:]
t.functab = t.Data[offset:]
t.nfunctab = uint32(offset(0))
t.nfiletab = uint32(offset(1))
t.funcnametab = data(2)
t.cutab = data(3)
t.filetab = data(4)
t.pctab = data(5)
t.funcdata = data(6)
t.functab = data(6)
functabsize := t.nfunctab*2*t.ptrsize + t.ptrsize
t.functab = t.functab[:functabsize]
case ver12: