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Genericized array reading

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This commit is contained in:
epipho
2015-01-20 00:32:08 -05:00
parent 99b614a028
commit e2236664dd
3 changed files with 33 additions and 31 deletions
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3
_fixtures/testvariables.go
View File

@ -30,6 +30,7 @@ func foobar(baz string, bar FooBar) {
a8 = FooBar2{Bur: 10, Baz: "feh"}
a9 = (*FooBar)(nil)
a10 = a1[2:5]
a11 = [3]FooBar{{1, "a"}, {2, "b"}, {3, "c"}}
b1 = true
b2 = false
neg = -1
@ -45,7 +46,7 @@ func foobar(baz string, bar FooBar) {
)
barfoo()
fmt.Println(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, b1, b2, baz, neg, i8, u8, u16, u32, u64, up, f32, i32, bar, f)
fmt.Println(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, b1, b2, baz, neg, i8, u8, u16, u32, u64, up, f32, i32, bar, f)
}
func main() {

45
proctl/variables.go
View File

@ -448,7 +448,7 @@ func (thread *ThreadContext) evaluateStructMember(parentEntry *dwarf.Entry, read
binary.LittleEndian.PutUint64(baseAddr, uint64(parentAddr))
parentInstructions := append([]byte{op.DW_OP_addr}, baseAddr...)
val, err := thread.extractValue(append(parentInstructions, memberInstr...), 0, t)
val, err := thread.extractValue(append(parentInstructions, memberInstr...), 0, t, true)
if err != nil {
return nil, err
}
@ -490,7 +490,7 @@ func (thread *ThreadContext) extractVariableFromEntry(entry *dwarf.Entry) (*Vari
return nil, fmt.Errorf("type assertion failed")
}
val, err := thread.extractValue(instructions, 0, t)
val, err := thread.extractValue(instructions, 0, t, true)
if err != nil {
return nil, err
}
@ -556,7 +556,7 @@ func (thread *ThreadContext) extractVariableDataAddress(entry *dwarf.Entry, read
// Extracts the value from the instructions given in the DW_AT_location entry.
// We execute the stack program described in the DW_OP_* instruction stream, and
// then grab the value from the other processes memory.
func (thread *ThreadContext) extractValue(instructions []byte, addr int64, typ interface{}) (string, error) {
func (thread *ThreadContext) extractValue(instructions []byte, addr int64, typ interface{}, printStructName bool) (string, error) {
var err error
if addr == 0 {
@ -585,7 +585,7 @@ func (thread *ThreadContext) extractValue(instructions []byte, addr int64, typ i
return fmt.Sprintf("%s nil", t.String()), nil
}
val, err := thread.extractValue(nil, intaddr, t.Type)
val, err := thread.extractValue(nil, intaddr, t.Type, printStructName)
if err != nil {
return "", err
}
@ -602,18 +602,21 @@ func (thread *ThreadContext) extractValue(instructions []byte, addr int64, typ i
// the value of all the members of the struct.
fields := make([]string, 0, len(t.Field))
for _, field := range t.Field {
val, err := thread.extractValue(nil, field.ByteOffset+addr, field.Type)
val, err := thread.extractValue(nil, field.ByteOffset+addr, field.Type, printStructName)
if err != nil {
return "", err
}
fields = append(fields, fmt.Sprintf("%s: %s", field.Name, val))
}
retstr := fmt.Sprintf("%s {%s}", t.StructName, strings.Join(fields, ", "))
return retstr, nil
if printStructName {
return fmt.Sprintf("%s {%s}", t.StructName, strings.Join(fields, ", ")), nil
} else {
return fmt.Sprintf("{%s}", strings.Join(fields, ", ")), nil
}
}
case *dwarf.ArrayType:
return thread.readIntArray(ptraddress, t)
return thread.readArray(ptraddress, t)
case *dwarf.IntType:
return thread.readInt(ptraddress, t.ByteSize)
case *dwarf.UintType:
@ -681,23 +684,19 @@ func (thread *ThreadContext) readIntSlice(addr uintptr, t *dwarf.StructType) (st
return "", fmt.Errorf("Could not read slice")
}
func (thread *ThreadContext) readIntArray(addr uintptr, t *dwarf.ArrayType) (string, error) {
val, err := thread.readMemory(addr, uintptr(t.ByteSize))
if err != nil {
return "", err
func (thread *ThreadContext) readArray(addr uintptr, t *dwarf.ArrayType) (string, error) {
vals := make([]string, 0)
stride := t.ByteSize / t.Count
for i := int64(0); i < t.Count; i++ {
val, err := thread.extractValue(nil, int64(addr+uintptr(i*stride)), t.Type, false)
if err != nil {
return "", err
}
vals = append(vals, val)
}
switch t.Type.Size() {
case 4:
members := *(*[]uint32)(unsafe.Pointer(&val))
setSliceLength(unsafe.Pointer(&members), int(t.Count))
return fmt.Sprintf("%s %d", t, members), nil
case 8:
members := *(*[]uint64)(unsafe.Pointer(&val))
setSliceLength(unsafe.Pointer(&members), int(t.Count))
return fmt.Sprintf("%s %d", t, members), nil
}
return "", fmt.Errorf("Could not read array")
return fmt.Sprintf("%s [%s]", t, strings.Join(vals, ",")), nil
}
func (thread *ThreadContext) readInt(addr uintptr, size int64) (string, error) {

16
proctl/variables_test.go
View File

@ -39,9 +39,10 @@ func TestVariableEvaluation(t *testing.T) {
testcases := []varTest{
{"a1", "foofoofoofoofoofoo", "struct string", nil},
{"a10", "ofo", "struct string", nil},
{"a11", "[3]main.FooBar [{Baz: 1, Bur: a},{Baz: 2, Bur: b},{Baz: 3, Bur: c}]", "[3]main.FooBar", nil},
{"a2", "6", "int", nil},
{"a3", "7.23", "float64", nil},
{"a4", "[2]int [1 2]", "[2]int", nil},
{"a4", "[2]int [1,2]", "[2]int", nil},
{"a5", "len: 5 cap: 5 [1 2 3 4 5]", "struct []int", nil},
{"a6", "main.FooBar {Baz: 8, Bur: word}", "main.FooBar", nil},
{"a7", "*main.FooBar {Baz: 5, Bur: strum}", "*main.FooBar", nil},
@ -56,7 +57,7 @@ func TestVariableEvaluation(t *testing.T) {
{"a9.Baz", "nil", "int", errors.New("a9 is nil")},
{"a9.NonExistent", "nil", "int", errors.New("a9 has no member NonExistent")},
{"a8", "main.FooBar2 {Bur: 10, Baz: feh}", "main.FooBar2", nil}, // reread variable after member
{"i32", "[2]int32 [1 2]", "[2]int32", nil},
{"i32", "[2]int32 [1,2]", "[2]int32", nil},
{"b1", "true", "bool", nil},
{"b2", "false", "bool", nil}, {"i8", "1", "int8", nil},
{"u16", "65535", "uint16", nil},
@ -69,7 +70,7 @@ func TestVariableEvaluation(t *testing.T) {
}
withTestProcess(executablePath, t, func(p *DebuggedProcess) {
pc, _, _ := p.GoSymTable.LineToPC(fp, 47)
pc, _, _ := p.GoSymTable.LineToPC(fp, 48)
_, err := p.Break(pc)
assertNoError(err, t, "Break() returned an error")
@ -100,7 +101,7 @@ func TestVariableFunctionScoping(t *testing.T) {
}
withTestProcess(executablePath, t, func(p *DebuggedProcess) {
pc, _, _ := p.GoSymTable.LineToPC(fp, 47)
pc, _, _ := p.GoSymTable.LineToPC(fp, 48)
_, err := p.Break(pc)
assertNoError(err, t, "Break() returned an error")
@ -166,9 +167,10 @@ func TestLocalVariables(t *testing.T) {
[]varTest{
{"a1", "foofoofoofoofoofoo", "struct string", nil},
{"a10", "ofo", "struct string", nil},
{"a11", "[3]main.FooBar [{Baz: 1, Bur: a},{Baz: 2, Bur: b},{Baz: 3, Bur: c}]", "[3]main.FooBar", nil},
{"a2", "6", "int", nil},
{"a3", "7.23", "float64", nil},
{"a4", "[2]int [1 2]", "[2]int", nil},
{"a4", "[2]int [1,2]", "[2]int", nil},
{"a5", "len: 5 cap: 5 [1 2 3 4 5]", "struct []int", nil},
{"a6", "main.FooBar {Baz: 8, Bur: word}", "main.FooBar", nil},
{"a7", "*main.FooBar {Baz: 5, Bur: strum}", "*main.FooBar", nil},
@ -178,7 +180,7 @@ func TestLocalVariables(t *testing.T) {
{"b2", "false", "bool", nil},
{"f", "main.barfoo", "func()", nil},
{"f32", "1.2", "float32", nil},
{"i32", "[2]int32 [1 2]", "[2]int32", nil},
{"i32", "[2]int32 [1,2]", "[2]int32", nil},
{"i8", "1", "int8", nil},
{"neg", "-1", "int", nil},
{"u16", "65535", "uint16", nil},
@ -193,7 +195,7 @@ func TestLocalVariables(t *testing.T) {
}
withTestProcess(executablePath, t, func(p *DebuggedProcess) {
pc, _, _ := p.GoSymTable.LineToPC(fp, 47)
pc, _, _ := p.GoSymTable.LineToPC(fp, 48)
_, err := p.Break(pc)
assertNoError(err, t, "Break() returned an error")