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cmd/compile: fix libfuzzer instrumentation line number

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Set a reasonable starting line number before processing the body of
the function in the order pass.

We update base.Pos each time we process a node, but some of the
libfuzzer instrumentation is added before we process any node, so the
base.Pos used is junk.

Fixes #53688

Change-Id: I3654b805eabb8866a9a1574845ef4ff062797319
Reviewed-on: https://go-review.googlesource.com/c/go/+/416654
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Keith Randall 2022-07-08 14:52:23 -07:00 committed by Keith Randall
parent 5c1a13e7a4
commit c1a4e0fe01
1 changed files with 7 additions and 1 deletions
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8
src/cmd/compile/internal/walk/order.go
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@ -63,7 +63,7 @@ func order(fn *ir.Func) {
s := fmt.Sprintf("\nbefore order %v", fn.Sym())
ir.DumpList(s, fn.Body)
}
ir.SetPos(fn) // Set reasonable position for instrumenting code. See issue 53688.
orderBlock(&fn.Body, map[string][]*ir.Name{})
}
@ -477,6 +477,12 @@ func (o *orderState) edge() {
// and then replaces the old slice in n with the new slice.
// free is a map that can be used to obtain temporary variables by type.
func orderBlock(n *ir.Nodes, free map[string][]*ir.Name) {
if len(*n) != 0 {
// Set reasonable position for instrumenting code. See issue 53688.
// It would be nice if ir.Nodes had a position (the opening {, probably),
// but it doesn't. So we use the first statement's position instead.
ir.SetPos((*n)[0])
}
var order orderState
order.free = free
mark := order.markTemp()