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cmd/compile: remove statement marks from secondary calls

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Calls are code-generated in an alternate path that inherits
its positions from values, not from *SSAGenState.  The
default position on *SSAGenState was marked as not-a-statement,
but this was not applied to the value itself, leading to
spurious "is statement" marks in the output (convention:
after code generation in the compiler, everything is either
definitely a statement or definitely not a statement, nothing
is in the undetermined state).

This CL causes a 35 statement regression in ssa/stmtlines_test.
This is down from the earlier 150 because of all the other
CLs preceding this one that deal with the root causes of the
missing lines (repeated lines on nested calls hid missing lines).

This also removes some line repeats from ssa/debug_test.

Change-Id: Ie9a507bd5447e906b35bbd098e3295211df2ae01
Reviewed-on: https://go-review.googlesource.com/c/go/+/188018
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
David Chase 2019-07-29 16:23:31 -04:00
parent 9a926911fe
commit c450ace12c
4 changed files with 19 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/cmd/compile/internal/gc/ssa.go
View File

@ -5238,8 +5238,11 @@ func (s *SSAGenState) DebugFriendlySetPosFrom(v *ssa.Value) {
// in the generated code.
if p.IsStmt() != src.PosIsStmt {
p = p.WithNotStmt()
// Calls use the pos attached to v, but copy the statement mark from SSAGenState
}
s.SetPos(p)
} else {
s.SetPos(s.pp.pos.WithNotStmt())
}
}
}
@ -5878,10 +5881,15 @@ func (s *SSAGenState) AddrScratch(a *obj.Addr) {
// Call returns a new CALL instruction for the SSA value v.
// It uses PrepareCall to prepare the call.
func (s *SSAGenState) Call(v *ssa.Value) *obj.Prog {
pPosIsStmt := s.pp.pos.IsStmt() // The statement-ness fo the call comes from ssaGenState
s.PrepareCall(v)
p := s.Prog(obj.ACALL)
p.Pos = v.Pos
if pPosIsStmt == src.PosIsStmt {
p.Pos = v.Pos.WithIsStmt()
} else {
p.Pos = v.Pos.WithNotStmt()
}
if sym, ok := v.Aux.(*obj.LSym); ok {
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN

8
src/cmd/compile/internal/ssa/testdata/hist.dlv-opt.nexts vendored
View File

@ -70,32 +70,24 @@
87: if a == 0 { //gdb-opt=(a,n,t)
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
86: for i, a := range hist {

2
src/cmd/compile/internal/ssa/testdata/hist.gdb-dbg.nexts vendored
View File

@ -9,7 +9,7 @@ l.end.y = 4
61: sink = dx + dy //gdb-opt=(dx,dy)
63: hist := make([]int, 7) //gdb-opt=(dx/O,dy/O) // TODO sink is missing if this code is in 'test' instead of 'main'
64: var reader io.Reader = strings.NewReader(cannedInput) //gdb-dbg=(hist/A) // TODO cannedInput/A is missing if this code is in 'test' instead of 'main'
hist = []int = {0, 0, 0, 0, 0, 0, 0}
hist = {array = <A>, len = 7, cap = 7}
65: if len(os.Args) > 1 {
73: scanner := bufio.NewScanner(reader)
74: for scanner.Scan() { //gdb-opt=(scanner/A)

44
src/cmd/compile/internal/ssa/testdata/hist.gdb-opt.nexts vendored
View File

@ -24,92 +24,74 @@ scanner = (bufio.Scanner *) <A>
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 0, 0, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 1
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 1, 0, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 1
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 2, 0, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 1
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 0, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 2
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 1, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 2
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 2, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 2
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 3, 0, 0, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 4
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 3, 0, 1, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 4
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
75: s := scanner.Text()
76: i, err := strconv.ParseInt(s, 10, 64)
77: if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
err = {tab = 0x0, data = 0x0}
hist = []int = {0, 3, 3, 0, 2, 0, 0}
hist = {array = 0xc00005ae50, len = 7, cap = 7}
i = 5
81: hist = ensure(int(i), hist)
82: hist[int(i)]++
74: for scanner.Scan() { //gdb-opt=(scanner/A)
scanner = (bufio.Scanner *) <A>
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
a = 0
@ -122,9 +104,7 @@ n = 0
t = 0
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
a = 3
@ -132,9 +112,7 @@ n = 3
t = 3
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
a = 0
@ -147,9 +125,7 @@ n = 6
t = 9
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
a = 1
@ -157,9 +133,7 @@ n = 8
t = 17
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
91: n += a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
90: t += i * a
92: fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
86: for i, a := range hist {
87: if a == 0 { //gdb-opt=(a,n,t)
a = 0