PenaDevops/delve
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Read string type from memory

Browse Source
This commit is contained in:
Derek Parker 2014-08-04 13:53:15 -05:00
parent 31f7278526
commit f8abe30aa7
2 changed files with 24 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
proctl/proctl_linux_amd64.go
View File

@ -12,6 +12,7 @@ import (
"os"
"strconv"
"syscall"
"unsafe"
"github.com/derekparker/dbg/dwarf/frame"
"github.com/derekparker/dbg/dwarf/line"
@ -376,6 +377,8 @@ func (dbp *DebuggedProcess) extractValue(instructions []byte, typ interface{}) (
offset := uintptr(int64(regs.Rsp) + off)
switch typ.(type) {
case *dwarf.StructType:
return dbp.readString(offset)
case *dwarf.IntType:
return dbp.readInt(offset)
case *dwarf.FloatType:
@ -385,6 +388,25 @@ func (dbp *DebuggedProcess) extractValue(instructions []byte, typ interface{}) (
return "", fmt.Errorf("could not find value for type %s", typ)
}
func (dbp *DebuggedProcess) readString(addr uintptr) (string, error) {
val, err := dbp.readMemory(addr, 8)
if err != nil {
return "", err
}
// deref the pointer to the string
addr = uintptr(binary.LittleEndian.Uint64(val))
val, err = dbp.readMemory(addr, 16)
if err != nil {
return "", err
}
i := bytes.IndexByte(val, 0x0)
val = val[:i]
str := *(*string)(unsafe.Pointer(&val))
return str, nil
}
func (dbp *DebuggedProcess) readInt(addr uintptr) (string, error) {
val, err := dbp.readMemory(addr, 8)
if err != nil {

3
proctl/proctl_test.go
View File

@ -231,6 +231,7 @@ func TestVariableEvaluation(t *testing.T) {
value string
varType string
}{
{"a1", "foo", "struct string"},
{"a2", "6", "int"},
{"a3", "7.23", "float64"},
}
@ -257,7 +258,7 @@ func TestVariableEvaluation(t *testing.T) {
}
if variable.Value != tc.value {
t.Fatalf("Expected %s got %s\n", tc.value, variable.Value)
t.Fatalf("Expected %#v got %#v\n", tc.value, variable.Value)
}
}
})