| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package loader |
| |
| import ( |
| "bytes" |
| "cmd/internal/goobj" |
| "cmd/internal/objabi" |
| "cmd/internal/sys" |
| "cmd/link/internal/sym" |
| "fmt" |
| "testing" |
| ) |
| |
| // dummyAddSym adds the named symbol to the loader as if it had been |
| // read from a Go object file. Note that it allocates a global |
| // index without creating an associated object reader, so one can't |
| // do anything interesting with this symbol (such as look at its |
| // data or relocations). |
| func addDummyObjSym(t *testing.T, ldr *Loader, or *oReader, name string) Sym { |
| idx := uint32(len(ldr.objSyms)) |
| st := loadState{l: ldr} |
| return st.addSym(name, 0, or, idx, nonPkgDef, &goobj.Sym{}) |
| } |
| |
| func mkLoader() *Loader { |
| edummy := func(str string, off int) {} |
| er := ErrorReporter{} |
| ldr := NewLoader(0, edummy, &er) |
| er.ldr = ldr |
| return ldr |
| } |
| |
| func TestAddMaterializedSymbol(t *testing.T) { |
| ldr := mkLoader() |
| dummyOreader := oReader{version: -1, syms: make([]Sym, 100)} |
| or := &dummyOreader |
| |
| // Create some syms from a dummy object file symbol to get things going. |
| ts1 := addDummyObjSym(t, ldr, or, "type.uint8") |
| ts2 := addDummyObjSym(t, ldr, or, "mumble") |
| ts3 := addDummyObjSym(t, ldr, or, "type.string") |
| |
| // Create some external symbols. |
| es1 := ldr.LookupOrCreateSym("extnew1", 0) |
| if es1 == 0 { |
| t.Fatalf("LookupOrCreateSym failed for extnew1") |
| } |
| es1x := ldr.LookupOrCreateSym("extnew1", 0) |
| if es1x != es1 { |
| t.Fatalf("LookupOrCreateSym lookup: expected %d got %d for second lookup", es1, es1x) |
| } |
| es2 := ldr.LookupOrCreateSym("go.info.type.uint8", 0) |
| if es2 == 0 { |
| t.Fatalf("LookupOrCreateSym failed for go.info.type.uint8") |
| } |
| // Create a nameless symbol |
| es3 := ldr.CreateStaticSym("") |
| if es3 == 0 { |
| t.Fatalf("CreateStaticSym failed for nameless sym") |
| } |
| |
| // Grab symbol builder pointers |
| sb1 := ldr.MakeSymbolUpdater(es1) |
| sb2 := ldr.MakeSymbolUpdater(es2) |
| sb3 := ldr.MakeSymbolUpdater(es3) |
| |
| // Suppose we create some more symbols, which triggers a grow. |
| // Make sure the symbol builder's payload pointer is valid, |
| // even across a grow. |
| for i := 0; i < 9999; i++ { |
| ldr.CreateStaticSym("dummy") |
| } |
| |
| // Check get/set symbol type |
| es3typ := sb3.Type() |
| if es3typ != sym.Sxxx { |
| t.Errorf("SymType(es3): expected %v, got %v", sym.Sxxx, es3typ) |
| } |
| sb3.SetType(sym.SRODATA) |
| es3typ = sb3.Type() |
| if es3typ != sym.SRODATA { |
| t.Errorf("SymType(es3): expected %v, got %v", sym.SRODATA, es3typ) |
| } |
| es3typ = ldr.SymType(es3) |
| if es3typ != sym.SRODATA { |
| t.Errorf("SymType(es3): expected %v, got %v", sym.SRODATA, es3typ) |
| } |
| |
| // New symbols should not initially be reachable. |
| if ldr.AttrReachable(es1) || ldr.AttrReachable(es2) || ldr.AttrReachable(es3) { |
| t.Errorf("newly materialized symbols should not be reachable") |
| } |
| |
| // ... however it should be possible to set/unset their reachability. |
| ldr.SetAttrReachable(es3, true) |
| if !ldr.AttrReachable(es3) { |
| t.Errorf("expected reachable symbol after update") |
| } |
| ldr.SetAttrReachable(es3, false) |
| if ldr.AttrReachable(es3) { |
| t.Errorf("expected unreachable symbol after update") |
| } |
| |
| // Test expansion of attr bitmaps |
| for idx := 0; idx < 36; idx++ { |
| es := ldr.LookupOrCreateSym(fmt.Sprintf("zext%d", idx), 0) |
| if ldr.AttrOnList(es) { |
| t.Errorf("expected OnList after creation") |
| } |
| ldr.SetAttrOnList(es, true) |
| if !ldr.AttrOnList(es) { |
| t.Errorf("expected !OnList after update") |
| } |
| if ldr.AttrDuplicateOK(es) { |
| t.Errorf("expected DupOK after creation") |
| } |
| ldr.SetAttrDuplicateOK(es, true) |
| if !ldr.AttrDuplicateOK(es) { |
| t.Errorf("expected !DupOK after update") |
| } |
| } |
| |
| sb1 = ldr.MakeSymbolUpdater(es1) |
| sb2 = ldr.MakeSymbolUpdater(es2) |
| |
| // Get/set a few other attributes |
| if ldr.AttrVisibilityHidden(es3) { |
| t.Errorf("expected initially not hidden") |
| } |
| ldr.SetAttrVisibilityHidden(es3, true) |
| if !ldr.AttrVisibilityHidden(es3) { |
| t.Errorf("expected hidden after update") |
| } |
| |
| // Test get/set symbol value. |
| toTest := []Sym{ts2, es3} |
| for i, s := range toTest { |
| if v := ldr.SymValue(s); v != 0 { |
| t.Errorf("ldr.Value(%d): expected 0 got %d\n", s, v) |
| } |
| nv := int64(i + 101) |
| ldr.SetSymValue(s, nv) |
| if v := ldr.SymValue(s); v != nv { |
| t.Errorf("ldr.SetValue(%d,%d): expected %d got %d\n", s, nv, nv, v) |
| } |
| } |
| |
| // Check/set alignment |
| es3al := ldr.SymAlign(es3) |
| if es3al != 0 { |
| t.Errorf("SymAlign(es3): expected 0, got %d", es3al) |
| } |
| ldr.SetSymAlign(es3, 128) |
| es3al = ldr.SymAlign(es3) |
| if es3al != 128 { |
| t.Errorf("SymAlign(es3): expected 128, got %d", es3al) |
| } |
| |
| // Add some relocations to the new symbols. |
| r1, _ := sb1.AddRel(objabi.R_ADDR) |
| r1.SetOff(0) |
| r1.SetSiz(1) |
| r1.SetSym(ts1) |
| r2, _ := sb1.AddRel(objabi.R_CALL) |
| r2.SetOff(3) |
| r2.SetSiz(8) |
| r2.SetSym(ts2) |
| r3, _ := sb2.AddRel(objabi.R_USETYPE) |
| r3.SetOff(7) |
| r3.SetSiz(1) |
| r3.SetSym(ts3) |
| |
| // Add some data to the symbols. |
| d1 := []byte{1, 2, 3} |
| d2 := []byte{4, 5, 6, 7} |
| sb1.AddBytes(d1) |
| sb2.AddBytes(d2) |
| |
| // Now invoke the usual loader interfaces to make sure |
| // we're getting the right things back for these symbols. |
| // First relocations... |
| expRel := [][]Reloc{{r1, r2}, {r3}} |
| for k, sb := range []*SymbolBuilder{sb1, sb2} { |
| rsl := sb.Relocs() |
| exp := expRel[k] |
| if !sameRelocSlice(&rsl, exp) { |
| t.Errorf("expected relocs %v, got %v", exp, rsl) |
| } |
| } |
| |
| // ... then data. |
| dat := sb2.Data() |
| if bytes.Compare(dat, d2) != 0 { |
| t.Errorf("expected es2 data %v, got %v", d2, dat) |
| } |
| |
| // Nameless symbol should still be nameless. |
| es3name := ldr.RawSymName(es3) |
| if "" != es3name { |
| t.Errorf("expected es3 name of '', got '%s'", es3name) |
| } |
| |
| // Read value of materialized symbol. |
| es1val := sb1.Value() |
| if 0 != es1val { |
| t.Errorf("expected es1 value of 0, got %v", es1val) |
| } |
| |
| // Test other misc methods |
| irm := ldr.IsReflectMethod(es1) |
| if 0 != es1val { |
| t.Errorf("expected IsReflectMethod(es1) value of 0, got %v", irm) |
| } |
| } |
| |
| func sameRelocSlice(s1 *Relocs, s2 []Reloc) bool { |
| if s1.Count() != len(s2) { |
| return false |
| } |
| for i := 0; i < s1.Count(); i++ { |
| r1 := s1.At(i) |
| r2 := &s2[i] |
| if r1.Sym() != r2.Sym() || |
| r1.Type() != r2.Type() || |
| r1.Off() != r2.Off() || |
| r1.Add() != r2.Add() || |
| r1.Siz() != r2.Siz() { |
| return false |
| } |
| } |
| return true |
| } |
| |
| type addFunc func(l *Loader, s Sym, s2 Sym) Sym |
| |
| func mkReloc(l *Loader, typ objabi.RelocType, off int32, siz uint8, add int64, sym Sym) Reloc { |
| r := Reloc{&goobj.Reloc{}, l.extReader, l, typ} |
| r.SetOff(off) |
| r.SetSiz(siz) |
| r.SetAdd(add) |
| r.SetSym(sym) |
| return r |
| } |
| |
| func TestAddDataMethods(t *testing.T) { |
| ldr := mkLoader() |
| dummyOreader := oReader{version: -1, syms: make([]Sym, 100)} |
| or := &dummyOreader |
| |
| // Populate loader with some symbols. |
| addDummyObjSym(t, ldr, or, "type.uint8") |
| ldr.LookupOrCreateSym("hello", 0) |
| |
| arch := sys.ArchAMD64 |
| var testpoints = []struct { |
| which string |
| addDataFunc addFunc |
| expData []byte |
| expKind sym.SymKind |
| expRel []Reloc |
| }{ |
| { |
| which: "AddUint8", |
| addDataFunc: func(l *Loader, s Sym, _ Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddUint8('a') |
| return s |
| }, |
| expData: []byte{'a'}, |
| expKind: sym.SDATA, |
| }, |
| { |
| which: "AddUintXX", |
| addDataFunc: func(l *Loader, s Sym, _ Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddUintXX(arch, 25185, 2) |
| return s |
| }, |
| expData: []byte{'a', 'b'}, |
| expKind: sym.SDATA, |
| }, |
| { |
| which: "SetUint8", |
| addDataFunc: func(l *Loader, s Sym, _ Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddUint8('a') |
| sb.AddUint8('b') |
| sb.SetUint8(arch, 1, 'c') |
| return s |
| }, |
| expData: []byte{'a', 'c'}, |
| expKind: sym.SDATA, |
| }, |
| { |
| which: "AddString", |
| addDataFunc: func(l *Loader, s Sym, _ Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.Addstring("hello") |
| return s |
| }, |
| expData: []byte{'h', 'e', 'l', 'l', 'o', 0}, |
| expKind: sym.SNOPTRDATA, |
| }, |
| { |
| which: "AddAddrPlus", |
| addDataFunc: func(l *Loader, s Sym, s2 Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddAddrPlus(arch, s2, 3) |
| return s |
| }, |
| expData: []byte{0, 0, 0, 0, 0, 0, 0, 0}, |
| expKind: sym.SDATA, |
| expRel: []Reloc{mkReloc(ldr, objabi.R_ADDR, 0, 8, 3, 6)}, |
| }, |
| { |
| which: "AddAddrPlus4", |
| addDataFunc: func(l *Loader, s Sym, s2 Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddAddrPlus4(arch, s2, 3) |
| return s |
| }, |
| expData: []byte{0, 0, 0, 0}, |
| expKind: sym.SDATA, |
| expRel: []Reloc{mkReloc(ldr, objabi.R_ADDR, 0, 4, 3, 7)}, |
| }, |
| { |
| which: "AddCURelativeAddrPlus", |
| addDataFunc: func(l *Loader, s Sym, s2 Sym) Sym { |
| sb := l.MakeSymbolUpdater(s) |
| sb.AddCURelativeAddrPlus(arch, s2, 7) |
| return s |
| }, |
| expData: []byte{0, 0, 0, 0, 0, 0, 0, 0}, |
| expKind: sym.SDATA, |
| expRel: []Reloc{mkReloc(ldr, objabi.R_ADDRCUOFF, 0, 8, 7, 8)}, |
| }, |
| } |
| |
| var pmi Sym |
| for k, tp := range testpoints { |
| name := fmt.Sprintf("new%d", k+1) |
| mi := ldr.LookupOrCreateSym(name, 0) |
| if mi == 0 { |
| t.Fatalf("LookupOrCreateSym failed for '" + name + "'") |
| } |
| mi = tp.addDataFunc(ldr, mi, pmi) |
| if ldr.SymType(mi) != tp.expKind { |
| t.Errorf("testing Loader.%s: expected kind %s got %s", |
| tp.which, tp.expKind, ldr.SymType(mi)) |
| } |
| if bytes.Compare(ldr.Data(mi), tp.expData) != 0 { |
| t.Errorf("testing Loader.%s: expected data %v got %v", |
| tp.which, tp.expData, ldr.Data(mi)) |
| } |
| relocs := ldr.Relocs(mi) |
| if !sameRelocSlice(&relocs, tp.expRel) { |
| t.Fatalf("testing Loader.%s: got relocslice %+v wanted %+v", |
| tp.which, relocs, tp.expRel) |
| } |
| pmi = mi |
| } |
| } |
| |
| func TestOuterSub(t *testing.T) { |
| ldr := mkLoader() |
| dummyOreader := oReader{version: -1, syms: make([]Sym, 100)} |
| or := &dummyOreader |
| |
| // Populate loader with some symbols. |
| addDummyObjSym(t, ldr, or, "type.uint8") |
| es1 := ldr.LookupOrCreateSym("outer", 0) |
| ldr.MakeSymbolUpdater(es1).SetSize(101) |
| es2 := ldr.LookupOrCreateSym("sub1", 0) |
| es3 := ldr.LookupOrCreateSym("sub2", 0) |
| es4 := ldr.LookupOrCreateSym("sub3", 0) |
| es5 := ldr.LookupOrCreateSym("sub4", 0) |
| es6 := ldr.LookupOrCreateSym("sub5", 0) |
| |
| // Should not have an outer sym initially |
| if ldr.OuterSym(es1) != 0 { |
| t.Errorf("es1 outer sym set ") |
| } |
| if ldr.SubSym(es2) != 0 { |
| t.Errorf("es2 outer sym set ") |
| } |
| |
| // Establish first outer/sub relationship |
| ldr.AddInteriorSym(es1, es2) |
| if ldr.OuterSym(es1) != 0 { |
| t.Errorf("ldr.OuterSym(es1) got %d wanted %d", ldr.OuterSym(es1), 0) |
| } |
| if ldr.OuterSym(es2) != es1 { |
| t.Errorf("ldr.OuterSym(es2) got %d wanted %d", ldr.OuterSym(es2), es1) |
| } |
| if ldr.SubSym(es1) != es2 { |
| t.Errorf("ldr.SubSym(es1) got %d wanted %d", ldr.SubSym(es1), es2) |
| } |
| if ldr.SubSym(es2) != 0 { |
| t.Errorf("ldr.SubSym(es2) got %d wanted %d", ldr.SubSym(es2), 0) |
| } |
| |
| // Establish second outer/sub relationship |
| ldr.AddInteriorSym(es1, es3) |
| if ldr.OuterSym(es1) != 0 { |
| t.Errorf("ldr.OuterSym(es1) got %d wanted %d", ldr.OuterSym(es1), 0) |
| } |
| if ldr.OuterSym(es2) != es1 { |
| t.Errorf("ldr.OuterSym(es2) got %d wanted %d", ldr.OuterSym(es2), es1) |
| } |
| if ldr.OuterSym(es3) != es1 { |
| t.Errorf("ldr.OuterSym(es3) got %d wanted %d", ldr.OuterSym(es3), es1) |
| } |
| if ldr.SubSym(es1) != es3 { |
| t.Errorf("ldr.SubSym(es1) got %d wanted %d", ldr.SubSym(es1), es3) |
| } |
| if ldr.SubSym(es3) != es2 { |
| t.Errorf("ldr.SubSym(es3) got %d wanted %d", ldr.SubSym(es3), es2) |
| } |
| |
| // Some more |
| ldr.AddInteriorSym(es1, es4) |
| ldr.AddInteriorSym(es1, es5) |
| ldr.AddInteriorSym(es1, es6) |
| |
| // Set values. |
| ldr.SetSymValue(es2, 7) |
| ldr.SetSymValue(es3, 1) |
| ldr.SetSymValue(es4, 13) |
| ldr.SetSymValue(es5, 101) |
| ldr.SetSymValue(es6, 3) |
| |
| // Sort |
| news := ldr.SortSub(es1) |
| if news != es3 { |
| t.Errorf("ldr.SortSub leader got %d wanted %d", news, es3) |
| } |
| pv := int64(-1) |
| count := 0 |
| for ss := ldr.SubSym(es1); ss != 0; ss = ldr.SubSym(ss) { |
| v := ldr.SymValue(ss) |
| if v <= pv { |
| t.Errorf("ldr.SortSub sortfail at %d: val %d >= prev val %d", |
| ss, v, pv) |
| } |
| pv = v |
| count++ |
| } |
| if count != 5 { |
| t.Errorf("expected %d in sub list got %d", 5, count) |
| } |
| } |
