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cmd/compile, cmd/link: add coverage instrumentation for libfuzzer

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This CL adds experimental coverage instrumentation similar to what
github.com/dvyukov/go-fuzz produces in its -libfuzzer mode. The
coverage can be enabled by compiling with -d=libfuzzer. It's intended
to be used in conjunction with -buildmode=c-archive to produce an ELF
archive (.a) file that can be linked with libFuzzer. See #14565 for
example usage.

The coverage generates a unique 8-bit counter for each basic block in
the original source code, and emits an increment operation. These
counters are then collected into the __libfuzzer_extra_counters ELF
section for use by libFuzzer.

Updates #14565.

Change-Id: I239758cc0ceb9ca1220f2d9d3d23b9e761db9bf1
Reviewed-on: https://go-review.googlesource.com/c/go/+/202117
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Matthew Dempsky 2019-10-18 17:39:39 -07:00
parent 383b447e0d
commit e341e93c51
10 changed files with 94 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/cmd/compile/internal/gc/syntax.go
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@ -293,9 +293,10 @@ const (
nameIsOutputParamHeapAddr // pointer to a result parameter's heap copy
nameAssigned // is the variable ever assigned to
nameAddrtaken // address taken, even if not moved to heap
nameInlFormal // OPAUTO created by inliner, derived from callee formal
nameInlLocal // OPAUTO created by inliner, derived from callee local
nameInlFormal // PAUTO created by inliner, derived from callee formal
nameInlLocal // PAUTO created by inliner, derived from callee local
nameOpenDeferSlot // if temporary var storing info for open-coded defers
nameLibfuzzerExtraCounter // if PEXTERN should be assigned to __libfuzzer_extra_counters section
)
func (n *Name) Captured() bool { return n.flags&nameCaptured != 0 }
@ -312,6 +313,7 @@ func (n *Name) Addrtaken() bool { return n.flags&nameAddrtaken != 0
func (n *Name) InlFormal() bool { return n.flags&nameInlFormal != 0 }
func (n *Name) InlLocal() bool { return n.flags&nameInlLocal != 0 }
func (n *Name) OpenDeferSlot() bool { return n.flags&nameOpenDeferSlot != 0 }
func (n *Name) LibfuzzerExtraCounter() bool { return n.flags&nameLibfuzzerExtraCounter != 0 }
func (n *Name) SetCaptured(b bool) { n.flags.set(nameCaptured, b) }
func (n *Name) SetReadonly(b bool) { n.flags.set(nameReadonly, b) }
@ -327,6 +329,7 @@ func (n *Name) SetAddrtaken(b bool) { n.flags.set(nameAddrtaken, b)
func (n *Name) SetInlFormal(b bool) { n.flags.set(nameInlFormal, b) }
func (n *Name) SetInlLocal(b bool) { n.flags.set(nameInlLocal, b) }
func (n *Name) SetOpenDeferSlot(b bool) { n.flags.set(nameOpenDeferSlot, b) }
func (n *Name) SetLibfuzzerExtraCounter(b bool) { n.flags.set(nameLibfuzzerExtraCounter, b) }
type Param struct {
Ntype *Node