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proc: flag variables that have a 'fake' address (#1619)

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Add variables flag to mark variables that are allocated on a register
(and have no address) and variables that we read as result of a
function call (and are allocated on a stack that no longer exists when
we show them to the user).
This commit is contained in:
Alessandro Arzilli
2019-07-16 22:12:16 +02:00
committed by Derek Parker
parent 158fb7bfac
commit 29a058ee7e
3 changed files with 20 additions and 5 deletions
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9
pkg/proc/variables.go
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@ -71,6 +71,12 @@ const (
VariableArgument
// VariableReturnArgument means this variable is a function return value
VariableReturnArgument
// VariableFakeAddress means the address of this variable is either fake
// (i.e. the variable is partially or completely stored in a CPU register
// and doesn't have a real address) or possibly no longer availabe (because
// the variable is the return value of a function call and allocated on a
// frame that no longer exists)
VariableFakeAddress
)
// Variable represents a variable. It contains the address, name,
@ -1051,6 +1057,9 @@ func (scope *EvalScope) extractVarInfoFromEntry(varEntry *dwarf.Entry) (*Variabl
}
v := scope.newVariable(n, uintptr(addr), t, mem)
if pieces != nil {
v.Flags |= VariableFakeAddress
}
v.LocationExpr = descr
v.DeclLine, _ = entry.Val(dwarf.AttrDeclLine).(int64)
if err != nil {