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compiler: reevaluate debug sequence points after shortening jumps

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Signed-off-by: Slava0135 <super.novalskiy_0135@inbox.ru>
This commit is contained in:
Slava0135 2024-04-14 12:24:49 +03:00
parent fb4a4f074f
commit 9b688a9ee9
2 changed files with 88 additions and 9 deletions
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19
pkg/compiler/codegen.go
View file

@ -2413,7 +2413,7 @@ func (c *codegen) writeJumps(b []byte) ([]byte, error) {
for _, f := range c.funcs {
f.rng.Start, f.rng.End = correctRange(f.rng.Start, f.rng.End, nopOffsets)
}
return removeNOPs(b, nopOffsets), nil
return removeNOPs(b, nopOffsets, c.sequencePoints), nil
}
func correctRange(start, end uint16, offsets []int) (uint16, uint16) {
@ -2455,9 +2455,10 @@ func (c *codegen) replaceLabelWithOffset(ip int, arg []byte) (int, error) {
// This is done in 2 passes:
// 1. Alter jump offsets taking into account parts to be removed.
// 2. Perform actual removal of jump targets.
// 3. Reevaluate debug sequence points offsets.
// Note: after jump offsets altering, there can appear new candidates for conversion.
// These are ignored for now.
func removeNOPs(b []byte, nopOffsets []int) []byte {
func removeNOPs(b []byte, nopOffsets []int, sequencePoints map[string][]DebugSeqPoint) []byte {
if len(nopOffsets) == 0 {
return b
}
@ -2519,6 +2520,20 @@ func removeNOPs(b []byte, nopOffsets []int) []byte {
copy(b[start-copyOffset:], b[start+1:end])
copyOffset++
}
// 3. Reevaluate debug sequence points.
for _, seqPoints := range sequencePoints {
for i := range seqPoints {
diff := 0
for _, offset := range nopOffsets {
if offset < seqPoints[i].Opcode {
diff++
}
}
seqPoints[i].Opcode -= diff
}
}
return b[:len(b)-copyOffset]
}

78
pkg/compiler/jumps_test.go
View file

@ -7,16 +7,17 @@ import (
"github.com/stretchr/testify/require"
)
func testShortenJumps(t *testing.T, before, after []opcode.Opcode, indices []int) {
func testShortenJumps(t *testing.T, before, after []opcode.Opcode, indices []int, spBefore, spAfter map[string][]DebugSeqPoint) {
prog := make([]byte, len(before))
for i := range before {
prog[i] = byte(before[i])
}
raw := removeNOPs(prog, indices)
raw := removeNOPs(prog, indices, spBefore)
actual := make([]opcode.Opcode, len(raw))
for i := range raw {
actual[i] = opcode.Opcode(raw[i])
}
require.Equal(t, spAfter, spBefore)
require.Equal(t, after, actual)
}
@ -45,18 +46,32 @@ func TestShortenJumps(t *testing.T) {
op, 3, 12, 0, 0, opcode.PUSH1, opcode.NOP,
sop, 249, sop, 0xFF - 2,
}
testShortenJumps(t, before, after, []int{2, 3, 4, 16, 17, 18, 21, 22, 23})
spBefore := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0}, DebugSeqPoint{Opcode: 5},
DebugSeqPoint{Opcode: 7}, DebugSeqPoint{Opcode: 12},
DebugSeqPoint{Opcode: 14}, DebugSeqPoint{Opcode: 19},
},
}
spAfter := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0}, DebugSeqPoint{Opcode: 2},
DebugSeqPoint{Opcode: 4}, DebugSeqPoint{Opcode: 9},
DebugSeqPoint{Opcode: 11}, DebugSeqPoint{Opcode: 13},
},
}
testShortenJumps(t, before, after, []int{2, 3, 4, 16, 17, 18, 21, 22, 23}, spBefore, spAfter)
})
}
t.Run("NoReplace", func(t *testing.T) {
b := []byte{0, 1, 2, 3, 4, 5}
expected := []byte{0, 1, 2, 3, 4, 5}
require.Equal(t, expected, removeNOPs(b, nil))
require.Equal(t, expected, removeNOPs(b, nil, map[string][]DebugSeqPoint{}))
})
t.Run("InvalidIndex", func(t *testing.T) {
before := []byte{byte(opcode.PUSH1), 0, 0, 0, 0}
require.Panics(t, func() {
removeNOPs(before, []int{0})
removeNOPs(before, []int{0}, map[string][]DebugSeqPoint{})
})
})
t.Run("SideConditions", func(t *testing.T) {
@ -69,7 +84,19 @@ func TestShortenJumps(t *testing.T) {
opcode.JMP, 2,
opcode.JMP, 2,
}
testShortenJumps(t, before, after, []int{2, 3, 4, 7, 8, 9})
spBefore := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0},
DebugSeqPoint{Opcode: 5},
},
}
spAfter := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0},
DebugSeqPoint{Opcode: 2},
},
}
testShortenJumps(t, before, after, []int{2, 3, 4, 7, 8, 9}, spBefore, spAfter)
})
t.Run("Backwards", func(t *testing.T) {
before := []opcode.Opcode{
@ -82,7 +109,21 @@ func TestShortenJumps(t *testing.T) {
opcode.JMP, 0xFF - 1,
opcode.JMP, 0xFF - 1,
}
testShortenJumps(t, before, after, []int{2, 3, 4, 7, 8, 9, 12, 13, 14})
spBefore := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0},
DebugSeqPoint{Opcode: 5},
DebugSeqPoint{Opcode: 10},
},
}
spAfter := map[string][]DebugSeqPoint{
"test": {
DebugSeqPoint{Opcode: 0},
DebugSeqPoint{Opcode: 2},
DebugSeqPoint{Opcode: 4},
},
}
testShortenJumps(t, before, after, []int{2, 3, 4, 7, 8, 9, 12, 13, 14}, spBefore, spAfter)
})
})
}
@ -100,6 +141,17 @@ func TestWriteJumps(t *testing.T) {
"main": {rng: DebugRange{Start: 4, End: 9}},
"method": {rng: DebugRange{Start: 10, End: 11}},
}
c.sequencePoints = map[string][]DebugSeqPoint{
"init": {
DebugSeqPoint{Opcode: 1}, DebugSeqPoint{Opcode: 3},
},
"main": {
DebugSeqPoint{Opcode: 4}, DebugSeqPoint{Opcode: 9},
},
"method": {
DebugSeqPoint{Opcode: 10}, DebugSeqPoint{Opcode: 11},
},
}
expProg := []byte{
byte(opcode.NOP), byte(opcode.JMP), 2, byte(opcode.RET),
@ -111,11 +163,23 @@ func TestWriteJumps(t *testing.T) {
"main": {rng: DebugRange{Start: 4, End: 6}},
"method": {rng: DebugRange{Start: 7, End: 8}},
}
expSeqPoints := map[string][]DebugSeqPoint{
"init": {
DebugSeqPoint{Opcode: 1}, DebugSeqPoint{Opcode: 3},
},
"main": {
DebugSeqPoint{Opcode: 4}, DebugSeqPoint{Opcode: 6},
},
"method": {
DebugSeqPoint{Opcode: 7}, DebugSeqPoint{Opcode: 8},
},
}
buf, err := c.writeJumps(before)
require.NoError(t, err)
require.Equal(t, expProg, buf)
require.Equal(t, expFuncs, c.funcs)
require.Equal(t, expSeqPoints, c.sequencePoints)
}
func TestWriteJumpsLastJump(t *testing.T) {