[Expressions] Add support of expressions evaluation in some object's context
Summary:
This patch adds support of expression evaluation in a context of some object.
Consider the following example:
```
struct S {
int a = 11;
int b = 12;
};
int main() {
S s;
int a = 1;
int b = 2;
// We have stopped here
return 0;
}
```
This patch allows to do something like that:
```
lldb.frame.FindVariable("s").EvaluateExpression("a + b")
```
and the result will be `33` (not `3`) because fields `a` and `b` of `s` will be
used (not locals `a` and `b`).
This is achieved by replacing of `this` type and object for the expression. This
has some limitations: an expression can be evaluated only for values located in
the debuggee process memory (they must have an address of `eAddressTypeLoad`
type).
Reviewers: teemperor, clayborg, jingham, zturner, labath, davide, spyffe, serge-sans-paille
Reviewed By: jingham
Subscribers: abidh, lldb-commits, leonid.mashinskiy
Tags: #lldb
Differential Revision: https://reviews.llvm.org/D55318
llvm-svn: 353149
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
index 745341b..6e7f11f 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
@@ -65,10 +65,12 @@
ClangExpressionDeclMap::ClangExpressionDeclMap(
bool keep_result_in_memory,
Materializer::PersistentVariableDelegate *result_delegate,
- ExecutionContext &exe_ctx)
+ ExecutionContext &exe_ctx,
+ ValueObject *ctx_obj)
: ClangASTSource(exe_ctx.GetTargetSP()), m_found_entities(),
m_struct_members(), m_keep_result_in_memory(keep_result_in_memory),
- m_result_delegate(result_delegate), m_parser_vars(), m_struct_vars() {
+ m_result_delegate(result_delegate), m_parser_vars(), m_struct_vars(),
+ m_ctx_obj(ctx_obj) {
EnableStructVars();
}
@@ -927,6 +929,21 @@
static ConstString g_lldb_class_name("$__lldb_class");
if (name == g_lldb_class_name) {
+ if (m_ctx_obj) {
+ Status status;
+ lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
+ if (!ctx_obj_ptr || status.Fail())
+ return;
+
+ AddThisType(context, TypeFromUser(m_ctx_obj->GetCompilerType()),
+ current_id);
+
+ m_struct_vars->m_object_pointer_type =
+ TypeFromUser(ctx_obj_ptr->GetCompilerType());
+
+ return;
+ }
+
// Clang is looking for the type of "this"
if (frame == NULL)
@@ -1019,6 +1036,21 @@
static ConstString g_lldb_objc_class_name("$__lldb_objc_class");
if (name == g_lldb_objc_class_name) {
+ if (m_ctx_obj) {
+ Status status;
+ lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
+ if (!ctx_obj_ptr || status.Fail())
+ return;
+
+ AddOneType(context, TypeFromUser(m_ctx_obj->GetCompilerType()),
+ current_id);
+
+ m_struct_vars->m_object_pointer_type =
+ TypeFromUser(ctx_obj_ptr->GetCompilerType());
+
+ return;
+ }
+
// Clang is looking for the type of "*self"
if (!frame)
@@ -2124,7 +2156,7 @@
}
void ClangExpressionDeclMap::AddThisType(NameSearchContext &context,
- TypeFromUser &ut,
+ const TypeFromUser &ut,
unsigned int current_id) {
CompilerType copied_clang_type = GuardedCopyType(ut);
@@ -2198,7 +2230,7 @@
}
void ClangExpressionDeclMap::AddOneType(NameSearchContext &context,
- TypeFromUser &ut,
+ const TypeFromUser &ut,
unsigned int current_id) {
CompilerType copied_clang_type = GuardedCopyType(ut);