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proc,dwarf/line: support is_stmt and prologue_end flags

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Go1.11 uses the is_stmt flag of .debug_line to communicate which
assembly instructions are good places for breakpoints, we should
respect this flag.

These changes were introduced by:
* https://go-review.googlesource.com/c/go/+/102435/

Additionally when setting next breakpoints ignore all PC addresses that
belong to the same line as the one currently under at the cursor. This
matches the behavior of gdb and avoids stopping multiple times at the
heading line of a for statement with go1.11.

Change: https://go-review.googlesource.com/c/go/+/110416 adds the
prologue_end flag to the .debug_line section to communicate the end of
the stack-split prologue. We should use it instead of pattern matching
the disassembly when available.

Fixes #550

type of interfaces
'c7cde8b'.
This commit is contained in:
aarzilli
2018-03-25 10:04:32 +02:00
committed by Derek Parker
parent 77056de757
commit 5155ef047f
23 changed files with 210 additions and 68 deletions
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18
pkg/dwarf/line/line_parser_test.go
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@ -55,10 +55,14 @@ func grabDebugLineSection(p string, t *testing.T) []byte {
}
const (
lineBaseGo14 int8 = -1
lineBaseGo18 int8 = -4
lineRangeGo14 uint8 = 4
lineRangeGo18 uint8 = 10
lineBaseGo14 int8 = -1
lineBaseGo18 int8 = -4
lineRangeGo14 uint8 = 4
lineRangeGo18 uint8 = 10
versionGo14 uint16 = 2
versionGo111 uint16 = 3
opcodeBaseGo14 uint8 = 10
opcodeBaseGo111 uint8 = 11
)
func testDebugLinePrologueParser(p string, t *testing.T) {
@ -70,7 +74,7 @@ func testDebugLinePrologueParser(p string, t *testing.T) {
for _, dbl := range debugLines {
prologue := dbl.Prologue
if prologue.Version != uint16(2) {
if prologue.Version != versionGo14 && prologue.Version != versionGo111 {
t.Fatal("Version not parsed correctly", prologue.Version)
}
@ -94,11 +98,11 @@ func testDebugLinePrologueParser(p string, t *testing.T) {
t.Fatal("Line Range not parsed correctly", prologue.LineRange)
}
if prologue.OpcodeBase != uint8(10) {
if prologue.OpcodeBase != opcodeBaseGo14 && prologue.OpcodeBase != opcodeBaseGo111 {
t.Fatal("Opcode Base not parsed correctly", prologue.OpcodeBase)
}
lengths := []uint8{0, 1, 1, 1, 1, 0, 0, 0, 1}
lengths := []uint8{0, 1, 1, 1, 1, 0, 0, 0, 1, 0}
for i, l := range prologue.StdOpLengths {
if l != lengths[i] {
t.Fatal("Length not parsed correctly", l)