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cmd/compile: walk progs to generate debug_lines data
Walking the progs is simpler than using the is_stmt symbol shenanigans. This is a reinstatement of CL 196661, which was rolled back due to tests failing. Unlike that original CL, this change should output the same debug_lines data the original approach wrote. The stats for JUST this CLC, note teh small speedup in compilation, and the lack of difference in binary size. name old time/op new time/op delta Template 229ms ± 4% 218ms ± 1% -4.95% (p=0.000 n=10+8) Unicode 92.6ms ± 9% 88.6ms ±13% ~ (p=0.089 n=10+10) GoTypes 850ms ± 2% 831ms ± 4% -2.23% (p=0.009 n=10+10) Compiler 3.99s ± 1% 3.93s ± 1% -1.29% (p=0.000 n=10+9) SSA 13.7s ± 1% 13.7s ± 1% ~ (p=0.912 n=10+10) Flate 140ms ± 3% 138ms ± 3% -1.90% (p=0.009 n=10+10) GoParser 172ms ± 2% 169ms ± 4% ~ (p=0.095 n=9+10) Reflect 530ms ± 3% 516ms ± 5% ~ (p=0.052 n=10+10) Tar 202ms ± 1% 196ms ± 3% -2.83% (p=0.002 n=9+10) XML 280ms ± 3% 270ms ± 4% -3.48% (p=0.009 n=10+10) LinkCompiler 927ms ± 2% 907ms ± 4% ~ (p=0.052 n=10+10) ExternalLinkCompiler 1.97s ± 2% 1.97s ± 3% ~ (p=0.853 n=10+10) LinkWithoutDebugCompiler 549ms ± 3% 543ms ± 5% ~ (p=0.481 n=10+10) StdCmd 12.0s ± 1% 12.0s ± 1% ~ (p=0.905 n=9+10) name old user-time/op new user-time/op delta Template 372ms ±18% 344ms ±11% ~ (p=0.190 n=10+10) Unicode 264ms ±23% 241ms ±43% ~ (p=0.315 n=8+10) GoTypes 1.56s ±22% 1.68s ± 5% ~ (p=0.237 n=10+8) Compiler 7.41s ± 2% 7.31s ± 3% ~ (p=0.123 n=10+10) SSA 24.5s ± 2% 24.7s ± 1% ~ (p=0.133 n=10+9) Flate 199ms ± 6% 188ms ±28% ~ (p=0.353 n=10+10) GoParser 243ms ±11% 240ms ± 6% ~ (p=0.968 n=10+9) Reflect 929ms ±21% 862ms ±35% ~ (p=0.190 n=10+10) Tar 284ms ± 9% 296ms ±17% ~ (p=0.497 n=9+10) XML 386ms ±21% 398ms ±28% ~ (p=1.000 n=9+10) LinkCompiler 1.13s ± 9% 1.12s ± 8% ~ (p=0.546 n=9+9) ExternalLinkCompiler 2.37s ±15% 2.30s ± 9% ~ (p=0.549 n=10+9) LinkWithoutDebugCompiler 646ms ±10% 642ms ±13% ~ (p=0.853 n=10+10) name old alloc/op new alloc/op delta Template 36.5MB ± 0% 36.5MB ± 0% -0.11% (p=0.000 n=10+9) Unicode 28.5MB ± 0% 28.5MB ± 0% ~ (p=0.190 n=10+10) GoTypes 121MB ± 0% 121MB ± 0% -0.10% (p=0.000 n=9+10) Compiler 549MB ± 0% 549MB ± 0% -0.10% (p=0.000 n=9+10) SSA 1.92GB ± 0% 1.92GB ± 0% -0.13% (p=0.000 n=10+10) Flate 23.0MB ± 0% 23.0MB ± 0% -0.07% (p=0.000 n=10+10) GoParser 27.9MB ± 0% 27.9MB ± 0% -0.09% (p=0.000 n=10+10) Reflect 77.9MB ± 0% 77.8MB ± 0% -0.13% (p=0.000 n=9+10) Tar 34.5MB ± 0% 34.4MB ± 0% -0.09% (p=0.000 n=10+10) XML 44.3MB ± 0% 44.3MB ± 0% -0.08% (p=0.000 n=10+10) LinkCompiler 229MB ± 0% 225MB ± 0% -1.74% (p=0.000 n=10+10) ExternalLinkCompiler 233MB ± 0% 242MB ± 0% +3.81% (p=0.000 n=10+10) LinkWithoutDebugCompiler 156MB ± 0% 152MB ± 0% -2.29% (p=0.000 n=10+9) name old allocs/op new allocs/op delta Template 373k ± 0% 373k ± 0% -0.21% (p=0.000 n=10+10) Unicode 340k ± 0% 340k ± 0% -0.04% (p=0.000 n=10+10) GoTypes 1.33M ± 0% 1.33M ± 0% -0.20% (p=0.000 n=10+9) Compiler 5.39M ± 0% 5.38M ± 0% -0.16% (p=0.000 n=10+10) SSA 18.3M ± 0% 18.2M ± 0% -0.15% (p=0.000 n=10+10) Flate 235k ± 0% 234k ± 0% -0.23% (p=0.000 n=10+7) GoParser 309k ± 0% 308k ± 0% -0.20% (p=0.000 n=10+10) Reflect 970k ± 0% 968k ± 0% -0.30% (p=0.000 n=10+10) Tar 347k ± 0% 347k ± 0% -0.22% (p=0.000 n=10+10) XML 425k ± 0% 424k ± 0% -0.16% (p=0.000 n=10+10) LinkCompiler 602k ± 0% 601k ± 0% -0.03% (p=0.000 n=9+10) ExternalLinkCompiler 1.65M ± 0% 1.65M ± 0% -0.02% (p=0.000 n=10+10) LinkWithoutDebugCompiler 220k ± 0% 220k ± 0% -0.03% (p=0.016 n=10+9) name old object-bytes new object-bytes delta Template 553kB ± 0% 553kB ± 0% -0.01% (p=0.000 n=10+10) Unicode 215kB ± 0% 215kB ± 0% ~ (all equal) GoTypes 2.02MB ± 0% 2.02MB ± 0% -0.00% (p=0.000 n=10+10) Compiler 7.98MB ± 0% 7.98MB ± 0% -0.01% (p=0.000 n=10+10) SSA 27.1MB ± 0% 27.1MB ± 0% -0.00% (p=0.000 n=10+10) Flate 340kB ± 0% 340kB ± 0% -0.01% (p=0.000 n=10+10) GoParser 434kB ± 0% 434kB ± 0% -0.00% (p=0.000 n=10+10) Reflect 1.34MB ± 0% 1.34MB ± 0% -0.01% (p=0.000 n=10+10) Tar 479kB ± 0% 479kB ± 0% -0.00% (p=0.000 n=10+10) XML 618kB ± 0% 618kB ± 0% -0.01% (p=0.000 n=10+10) name old export-bytes new export-bytes delta Template 20.4kB ± 0% 20.4kB ± 0% ~ (all equal) Unicode 8.21kB ± 0% 8.21kB ± 0% ~ (all equal) GoTypes 36.6kB ± 0% 36.6kB ± 0% ~ (all equal) Compiler 116kB ± 0% 116kB ± 0% +0.00% (p=0.000 n=10+10) SSA 141kB ± 0% 141kB ± 0% +0.00% (p=0.000 n=10+10) Flate 5.10kB ± 0% 5.10kB ± 0% ~ (all equal) GoParser 8.92kB ± 0% 8.92kB ± 0% ~ (all equal) Reflect 11.8kB ± 0% 11.8kB ± 0% ~ (all equal) Tar 10.9kB ± 0% 10.9kB ± 0% ~ (all equal) XML 17.4kB ± 0% 17.4kB ± 0% ~ (all equal) name old text-bytes new text-bytes delta HelloSize 742kB ± 0% 742kB ± 0% ~ (all equal) CmdGoSize 10.6MB ± 0% 10.6MB ± 0% ~ (all equal) name old data-bytes new data-bytes delta HelloSize 10.7kB ± 0% 10.7kB ± 0% ~ (all equal) CmdGoSize 312kB ± 0% 312kB ± 0% ~ (all equal) name old bss-bytes new bss-bytes delta HelloSize 122kB ± 0% 122kB ± 0% ~ (all equal) CmdGoSize 146kB ± 0% 146kB ± 0% ~ (all equal) name old exe-bytes new exe-bytes delta HelloSize 1.10MB ± 0% 1.10MB ± 0% ~ (all equal) CmdGoSize 14.9MB ± 0% 14.9MB ± 0% -0.03% (p=0.000 n=10+10) Change-Id: Ie078a42b29353b96654fa1f0f47d600b5a53762d Reviewed-on: https://go-review.googlesource.com/c/go/+/200017 Reviewed-by: Jeremy Faller <jeremy@golang.org> Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Jeremy Faller <jeremy@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Jeremy Faller
parent
fb9af8411e
commit
46b7557836
@ -8,6 +8,7 @@ package obj
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import (
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"cmd/internal/dwarf"
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"cmd/internal/src"
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"fmt"
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)
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@ -48,78 +49,45 @@ func (ctxt *Link) generateDebugLinesSymbol(s, lines *LSym) {
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// generating the line table. See below.
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// TODO: Once delve can support multiple DW_LNS_end_statements, we don't have
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// to do this.
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is_stmt := uint8(1)
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stmt := true
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line := int64(1)
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pc := s.Func.Text.Pc
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line := 1
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file := 1
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name := ""
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prologue, wrotePrologue := false, false
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// Walk the progs, generating the DWARF table.
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for p := s.Func.Text; p != nil; p = p.Link {
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prologue = prologue || (p.Pos.Xlogue() == src.PosPrologueEnd)
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// If we're not at a real instruction, keep looping!
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if p.Pos.Line() == 0 || (p.Link != nil && p.Link.Pc == p.Pc) {
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continue
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}
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newStmt := p.Pos.IsStmt() != src.PosNotStmt
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newName, newLine := linkgetlineFromPos(ctxt, p.Pos)
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// The linker will insert the DW_LNE_set_address once determined; therefore,
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// it's omitted here.
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// Generate the actual line information.
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// We use the pcline and pcfile to generate this section, and it's suboptimal.
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// Likely better would be to generate this dirrectly from the progs and not
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// parse those tables.
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// TODO: Generate from the progs if it's faster.
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pcfile := NewPCIter(uint32(ctxt.Arch.Arch.MinLC))
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pcline := NewPCIter(uint32(ctxt.Arch.Arch.MinLC))
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pcstmt := NewPCIter(uint32(ctxt.Arch.Arch.MinLC))
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pcfile.Init(s.Func.Pcln.Pcfile.P)
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pcline.Init(s.Func.Pcln.Pcline.P)
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var pctostmtData Pcdata
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funcpctab(ctxt, &pctostmtData, s, "pctostmt", pctostmt, nil)
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pcstmt.Init(pctostmtData.P)
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var thispc uint32
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for !pcfile.Done && !pcline.Done {
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// Only changed if it advanced
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if int32(file) != pcfile.Value {
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// Output debug info.
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wrote := false
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if name != newName {
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newFile := ctxt.PosTable.FileIndex(newName) + 1 // 1 indexing for the table.
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dctxt.AddUint8(lines, dwarf.DW_LNS_set_file)
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dwarf.Uleb128put(dctxt, lines, fileNums[pcfile.Value])
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file = int(pcfile.Value)
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dwarf.Uleb128put(dctxt, lines, int64(newFile))
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name = newName
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wrote = true
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}
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if prologue && !wrotePrologue {
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dctxt.AddUint8(lines, uint8(dwarf.DW_LNS_set_prologue_end))
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wrotePrologue = true
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wrote = true
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}
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if stmt != newStmt {
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dctxt.AddUint8(lines, uint8(dwarf.DW_LNS_negate_stmt))
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stmt = newStmt
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wrote = true
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}
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// Only changed if it advanced
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if is_stmt != uint8(pcstmt.Value) {
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new_stmt := uint8(pcstmt.Value)
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switch new_stmt &^ 1 {
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case PrologueEnd:
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dctxt.AddUint8(lines, uint8(dwarf.DW_LNS_set_prologue_end))
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case EpilogueBegin:
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// TODO if there is a use for this, add it.
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// Don't forget to increase OPCODE_BASE by 1 and add entry for standard_opcode_lengths[11]
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panic("unsupported EpilogueBegin")
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}
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new_stmt &= 1
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if is_stmt != new_stmt {
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is_stmt = new_stmt
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dctxt.AddUint8(lines, uint8(dwarf.DW_LNS_negate_stmt))
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}
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}
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// putpcldelta makes a row in the DWARF matrix, always, even if line is unchanged.
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putpclcdelta(ctxt, dctxt, lines, uint64(s.Func.Text.Pc+int64(thispc)-pc), int64(pcline.Value)-int64(line))
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pc = s.Func.Text.Pc + int64(thispc)
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line = int(pcline.Value)
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// Take the minimum step forward for the three iterators
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thispc = pcfile.NextPC
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if pcline.NextPC < thispc {
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thispc = pcline.NextPC
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}
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if !pcstmt.Done && pcstmt.NextPC < thispc {
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thispc = pcstmt.NextPC
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}
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if pcfile.NextPC == thispc {
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pcfile.Next()
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}
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if !pcstmt.Done && pcstmt.NextPC == thispc {
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pcstmt.Next()
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}
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if pcline.NextPC == thispc {
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pcline.Next()
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if line != int64(newLine) || wrote {
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pcdelta := p.Pc - pc
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putpclcdelta(ctxt, dctxt, lines, uint64(pcdelta), int64(newLine)-line)
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line, pc = int64(newLine), p.Pc
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}
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}
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@ -129,16 +97,16 @@ func (ctxt *Link) generateDebugLinesSymbol(s, lines *LSym) {
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// file = 1
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// line = 1
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// column = 0
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// is_stmt = set in header, we assume true
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// stmt = set in header, we assume true
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// basic_block = false
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// Careful readers of the DWARF specification will note that we don't reset
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// the address of the state machine -- but this will happen at the beginning
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// of the NEXT block of opcodes. (See the SetAddress call above.)
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// of the NEXT block of opcodes.
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dctxt.AddUint8(lines, dwarf.DW_LNS_set_file)
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dwarf.Uleb128put(dctxt, lines, 1)
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dctxt.AddUint8(lines, dwarf.DW_LNS_advance_line)
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dwarf.Sleb128put(dctxt, lines, int64(1-line))
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if is_stmt != 1 {
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if !stmt {
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dctxt.AddUint8(lines, dwarf.DW_LNS_negate_stmt)
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}
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dctxt.AddUint8(lines, dwarf.DW_LNS_copy)
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@ -5,16 +5,10 @@
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package obj
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import (
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"cmd/internal/src"
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"encoding/binary"
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"log"
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)
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const (
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PrologueEnd = 2 + iota // overload "is_stmt" to include prologue_end
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EpilogueBegin // overload "is_stmt" to include epilogue_end
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)
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// funcpctab writes to dst a pc-value table mapping the code in func to the values
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// returned by valfunc parameterized by arg. The invocation of valfunc to update the
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// current value is, for each p,
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@ -249,34 +243,6 @@ func pctospadj(ctxt *Link, sym *LSym, oldval int32, p *Prog, phase int32, arg in
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return oldval + p.Spadj
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}
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// pctostmt returns either,
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// if phase==0, then whether the current instruction is a step-target (Dwarf is_stmt)
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// bit-or'd with whether the current statement is a prologue end or epilogue begin
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// else (phase == 1), zero.
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//
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func pctostmt(ctxt *Link, sym *LSym, oldval int32, p *Prog, phase int32, arg interface{}) int32 {
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if phase == 1 {
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return 0 // Ignored; also different from initial value of -1, if that ever matters.
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}
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s := p.Pos.IsStmt()
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l := p.Pos.Xlogue()
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var is_stmt int32
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// PrologueEnd, at least, is passed to the next instruction
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switch l {
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case src.PosPrologueEnd:
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is_stmt = PrologueEnd
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case src.PosEpilogueBegin:
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is_stmt = EpilogueBegin
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}
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if s != src.PosNotStmt {
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is_stmt |= 1 // either PosDefaultStmt from asm, or PosIsStmt from go
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}
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return is_stmt
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}
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// pctopcdata computes the pcdata value in effect at p.
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// A PCDATA instruction sets the value in effect at future
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// non-PCDATA instructions.
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