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service/locations: hooked expression evaluator to location specifiers

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Location specifiers starting with '*' can be followed by any
expression supported by the evaluator.
The expression should evaluate to either an integer (which will be
interpreted as an address) or to a function pointer (which will be
dereferenced to get the function's entry point).
This commit is contained in:
aarzilli
2016-01-10 14:08:16 +01:00
committed by Derek Parker
parent 453bd0217f
commit 70cbbdc083
7 changed files with 145 additions and 70 deletions
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36
proc/variables.go
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@ -49,11 +49,11 @@ type Variable struct {
Len int64
Cap int64
// base address of arrays, base address of the backing array for slices (0 for nil slices)
// base address of the backing byte array for strings
// Base address of arrays, Base address of the backing array for slices (0 for nil slices)
// Base address of the backing byte array for strings
// address of the struct backing chan and map variables
// address of the function entry point for function variables (0 for nil function pointers)
base uintptr
Base uintptr
stride int64
fieldType dwarf.Type
@ -168,7 +168,7 @@ func newVariable(name string, addr uintptr, dwarfType dwarf.Type, dbp *Process,
v.stride = 1
v.fieldType = &dwarf.UintType{BasicType: dwarf.BasicType{CommonType: dwarf.CommonType{ByteSize: 1, Name: "byte"}, BitSize: 8, BitOffset: 0}}
if v.Addr != 0 {
v.base, v.Len, v.Unreadable = readStringInfo(v.mem, v.dbp.arch, v.Addr)
v.Base, v.Len, v.Unreadable = readStringInfo(v.mem, v.dbp.arch, v.Addr)
}
case t.StructName == "runtime.iface" || t.StructName == "runtime.eface":
v.Kind = reflect.Interface
@ -182,7 +182,7 @@ func newVariable(name string, addr uintptr, dwarfType dwarf.Type, dbp *Process,
}
case *dwarf.ArrayType:
v.Kind = reflect.Array
v.base = v.Addr
v.Base = v.Addr
v.Len = t.Count
v.Cap = -1
v.fieldType = t.Type
@ -254,7 +254,7 @@ func newConstant(val constant.Value, mem memoryReadWriter) *Variable {
var nilVariable = &Variable{
Addr: 0,
base: 0,
Base: 0,
Kind: reflect.Ptr,
Children: []Variable{{Addr: 0, OnlyAddr: true}},
}
@ -771,7 +771,7 @@ func (v *Variable) loadValue() {
}
func (v *Variable) loadValueInternal(recurseLevel int) {
if v.Unreadable != nil || v.loaded || (v.Addr == 0 && v.base == 0) {
if v.Unreadable != nil || v.loaded || (v.Addr == 0 && v.Base == 0) {
return
}
@ -788,14 +788,14 @@ func (v *Variable) loadValueInternal(recurseLevel int) {
sv.loadValueInternal(recurseLevel)
v.Children = sv.Children
v.Len = sv.Len
v.base = sv.Addr
v.Base = sv.Addr
case reflect.Map:
v.loadMap(recurseLevel)
case reflect.String:
var val string
val, v.Unreadable = readStringValue(v.mem, v.base, v.Len)
val, v.Unreadable = readStringValue(v.mem, v.Base, v.Len)
v.Value = constant.MakeString(val)
case reflect.Slice, reflect.Array:
@ -943,7 +943,7 @@ func (v *Variable) loadSliceInfo(t *dwarf.StructType) {
var base uint64
base, err = readUintRaw(v.mem, uintptr(int64(v.Addr)+f.ByteOffset), f.Type.Size())
if err == nil {
v.base = uintptr(base)
v.Base = uintptr(base)
// Dereference array type to get value type
ptrType, ok := f.Type.(*dwarf.PtrType)
if !ok {
@ -993,13 +993,13 @@ func (v *Variable) loadArrayValues(recurseLevel int) {
}
if v.stride < maxArrayStridePrefetch {
v.mem = cacheMemory(v.mem, v.base, int(v.stride*count))
v.mem = cacheMemory(v.mem, v.Base, int(v.stride*count))
}
errcount := 0
for i := int64(0); i < count; i++ {
fieldvar := v.newVariable("", uintptr(int64(v.base)+(i*v.stride)), v.fieldType)
fieldvar := v.newVariable("", uintptr(int64(v.Base)+(i*v.stride)), v.fieldType)
fieldvar.loadValueInternal(recurseLevel + 1)
if fieldvar.Unreadable != nil {
@ -1160,7 +1160,7 @@ func (v *Variable) readFunctionPtr() {
// dereference pointer to find function pc
fnaddr := uintptr(binary.LittleEndian.Uint64(val))
if fnaddr == 0 {
v.base = 0
v.Base = 0
v.Value = constant.MakeString("")
return
}
@ -1171,10 +1171,10 @@ func (v *Variable) readFunctionPtr() {
return
}
v.base = uintptr(binary.LittleEndian.Uint64(val))
fn := v.dbp.goSymTable.PCToFunc(uint64(v.base))
v.Base = uintptr(binary.LittleEndian.Uint64(val))
fn := v.dbp.goSymTable.PCToFunc(uint64(v.Base))
if fn == nil {
v.Unreadable = fmt.Errorf("could not find function for %#v", v.base)
v.Unreadable = fmt.Errorf("could not find function for %#v", v.Base)
return
}
@ -1238,7 +1238,7 @@ type mapIterator struct {
// Code derived from go/src/runtime/hashmap.go
func (v *Variable) mapIterator() *mapIterator {
sv := v.maybeDereference()
v.base = sv.Addr
v.Base = sv.Addr
maptype, ok := sv.RealType.(*dwarf.StructType)
if !ok {
@ -1253,7 +1253,7 @@ func (v *Variable) mapIterator() *mapIterator {
return it
}
v.mem = cacheMemory(v.mem, v.base, int(v.RealType.Size()))
v.mem = cacheMemory(v.mem, v.Base, int(v.RealType.Size()))
for _, f := range maptype.Field {
var err error