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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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16
proc/eval.go
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@ -282,7 +282,7 @@ func capBuiltin(args []*Variable, nodeargs []ast.Expr) (*Variable, error) {
if arg.Unreadable != nil {
return nil, arg.Unreadable
}
if arg.base == 0 {
if arg.Base == 0 {
return newConstant(constant.MakeInt64(0), arg.mem), nil
}
return newConstant(arg.Children[1].Value, arg.mem), nil
@ -315,7 +315,7 @@ func lenBuiltin(args []*Variable, nodeargs []ast.Expr) (*Variable, error) {
if arg.Unreadable != nil {
return nil, arg.Unreadable
}
if arg.base == 0 {
if arg.Base == 0 {
return newConstant(constant.MakeInt64(0), arg.mem), nil
}
return newConstant(arg.Children[0].Value, arg.mem), nil
@ -507,7 +507,7 @@ func (scope *EvalScope) evalIndex(node *ast.IndexExpr) (*Variable, error) {
switch xev.Kind {
case reflect.Slice, reflect.Array, reflect.String:
if xev.base == 0 {
if xev.Base == 0 {
return nil, fmt.Errorf("can not index \"%s\"", exprToString(node.X))
}
n, err := idxev.asInt()
@ -567,7 +567,7 @@ func (scope *EvalScope) evalReslice(node *ast.SliceExpr) (*Variable, error) {
switch xev.Kind {
case reflect.Slice, reflect.Array, reflect.String:
if xev.base == 0 {
if xev.Base == 0 {
return nil, fmt.Errorf("can not slice \"%s\"", exprToString(node.X))
}
return xev.reslice(low, high)
@ -917,7 +917,7 @@ func (v *Variable) isNil() bool {
case reflect.Interface:
return false
case reflect.Slice, reflect.Map, reflect.Func, reflect.Chan:
return v.base == 0
return v.Base == 0
}
return false
}
@ -1039,7 +1039,7 @@ func (v *Variable) sliceAccess(idx int) (*Variable, error) {
if idx < 0 || int64(idx) >= v.Len {
return nil, fmt.Errorf("index out of bounds")
}
return v.newVariable("", v.base+uintptr(int64(idx)*v.stride), v.fieldType), nil
return v.newVariable("", v.Base+uintptr(int64(idx)*v.stride), v.fieldType), nil
}
func (v *Variable) mapAccess(idx *Variable) (*Variable, error) {
@ -1081,7 +1081,7 @@ func (v *Variable) reslice(low int64, high int64) (*Variable, error) {
return nil, fmt.Errorf("index out of bounds")
}
base := v.base + uintptr(int64(low)*v.stride)
base := v.Base + uintptr(int64(low)*v.stride)
len := high - low
if high-low < 0 {
@ -1104,7 +1104,7 @@ func (v *Variable) reslice(low int64, high int64) (*Variable, error) {
r := v.newVariable("", 0, typ)
r.Cap = len
r.Len = len
r.base = base
r.Base = base
r.stride = v.stride
r.fieldType = v.fieldType