Debugger: Rework register handling

Use register names as handle, not their index in the view.
Store the raw real values, not some stringified version
as primary data.  Use subentries to break down bigger
registers into smaller entities. Also remember the
previous value of a register and show it in a tooltip.

Change-Id: I8ae3cc8766a7b211bc7cc827c734e5cf6060825c
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/qtcreatorcdbext/gdbmihelpers.cpp

@@ -364,6 +364,34 @@ const wchar_t *valueType(ULONG type)
     return L"";
 }
 
+// Description of a DEBUG_VALUE type field
+const int valueSize(ULONG type)
+{
+    switch (type) {
+    case DEBUG_VALUE_INT8:
+        return 1;
+    case DEBUG_VALUE_INT16:
+        return 2;
+    case DEBUG_VALUE_INT32:
+        return 4;
+    case DEBUG_VALUE_INT64:
+        return 8;
+    case DEBUG_VALUE_FLOAT32:
+        return 4;
+    case DEBUG_VALUE_FLOAT64:
+        return 8;
+    case DEBUG_VALUE_FLOAT80:
+        return 10;
+    case DEBUG_VALUE_FLOAT128:
+        return 16;
+    case DEBUG_VALUE_VECTOR64:
+        return 8;
+    case DEBUG_VALUE_VECTOR128:
+        return 16;
+    }
+    return 0;
+}
+
 // Format a 128bit vector register by adding digits in reverse order
 void formatVectorRegister(std::ostream &str, const unsigned char *array, int size)
 {
@@ -421,6 +449,7 @@ void formatDebugValue(std::ostream &str, const DEBUG_VALUE &dv, CIDebugControl *
 
 Register::Register() : subRegister(false), pseudoRegister(false)
 {
+    size = 0;
     value.Type = DEBUG_VALUE_INT32;
     value.I32 = 0;
 }
@@ -497,6 +526,7 @@ Registers getRegisters(CIDebugRegisters *regs,
         reg.pseudoRegister = true;
         reg.name = buf;
         reg.description = valueType(type);
+        reg.size = valueSize(type);
         reg.value = value;
         rc.push_back(reg);
     }