Add an helper class lldb.formatters.synth.PythonObjectSyntheticChildProvider

This class enables one to easily write a synthetic child provider by writing a class that returns pairs of names and primitive Python values - the base class then converts those into LLDB SBValues

Comes with a test case

llvm-svn: 280172

1 files changed, 57 insertions, 0 deletions

diff --git a/lldb/examples/summaries/synth.py b/lldb/examples/summaries/synth.py
new file mode 100644
index 00000000000..af5230997d8
--- /dev/null
+++ b/lldb/examples/summaries/synth.py
@@ -0,0 +1,57 @@
+import lldb
+
+class PythonObjectSyntheticChildProvider(object):
+  def __init__(self, value, internal_dict):
+    self.value = value
+    self.values = self.make_children()
+    self.built_values = {}
+    self.bo = self.value.target.byte_order
+    self.ps = self.value.target.addr_size
+  
+  def make_children(self):
+    pass
+  
+  def num_children(self):
+    return len(self.values)
+  
+  def get_child_index(self, name):
+    i = 0
+    for N, value in self.values:
+      if N == name: return i
+      i += 1
+    return None
+  
+  def update(self):
+    pass
+  
+  def has_children(self):
+    return len(self.values) > 0
+  
+  def gen_child(self, name, value):
+    data = None; type = None
+    if isinstance(value, int):
+      data = lldb.SBData.CreateDataFromUInt32Array(self.bo, self.ps, [value])
+      type = self.value.target.GetBasicType(lldb.eBasicTypeInt)
+    elif isinstance(value, long):
+      data = lldb.SBData.CreateDataFromUInt64Array(self.bo, self.ps, [value])
+      type = self.value.target.GetBasicType(lldb.eBasicTypeLong)
+    elif isinstance(value, float):
+      data = lldb.SBData.CreateDataFromDoubleArray(self.bo, self.ps, [value])
+      type = self.value.target.GetBasicType(lldb.eBasicTypeDouble)
+    elif isinstance(value, str):
+      data = lldb.SBData.CreateDataFromCString(self.bo, self.ps, value)
+      type = self.value.target.GetBasicType(lldb.eBasicTypeChar).GetArrayType(len(value))
+    if (data is not None) and (type is not None):
+      return self.value.CreateValueFromData(name, data, type)
+    return None
+  
+  def get_child_at_index(self, index):
+    if index in self.built_values:
+      return self.built_values[index]
+    
+    bv = None
+    
+    name, value = self.values[index]
+    bv = self.gen_child(name, value)
+    self.built_values[index] = bv
+    return bv