Debugger: improve dump time for various msvc std containers

... by caching the info whether we have a debug build. This avoids
expanding members of the container to check for a potential offset of
the actual data.

Change-Id: I4d7ac83003c303185ae51d57f0f0571b627edf22
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

share/qtcreator/debugger/dumper.py

@@ -167,6 +167,7 @@ class DumperBase():
         self.isGdb = False
         self.isLldb = False
         self.isCli = False
+        self.isDebugBuild = None
 
         # Later set, or not set:
         self.stringCutOff = 10000

share/qtcreator/debugger/stdtypes.py

@@ -204,11 +204,17 @@ def qdump__std__list(d, value):
 
 
 def qdump__std__list__QNX(d, value):
-    try:
-        _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
+    if d.isDebugBuild is None:
+        try:
+            _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
+            d.isDebugBuild = True
+        except Exception:
+            d.isDebugBuild = False
+    if d.isDebugBuild:
         (proxy, head, size) = value.split("ppp")
-    except Exception:
+    else:
         (head, size) = value.split("pp")
+
     d.putItemCount(size, 1000)
 
     if d.isExpanded():
@@ -271,10 +277,15 @@ def qdump__std__map(d, value):
 
 
 def qdump_std__map__helper(d, value):
-    try:
-        _ = value["_Mypair"]["_Myval2"]["_Myval2"]["_Myproxy"]
+    if d.isDebugBuild is None:
+        try:
+            _ = value["_Mypair"]["_Myval2"]["_Myval2"]["_Myproxy"]
+            d.isDebugBuild = True
+        except Exception:
+            d.isDebugBuild = False
+    if d.isDebugBuild:
         (proxy, head, size) = value.split("ppp")
-    except Exception:
+    else:
         (head, size) = value.split("pp")
     d.check(0 <= size and size <= 100 * 1000 * 1000)
     d.putItemCount(size)
@@ -450,10 +461,15 @@ def qdump__std__set(d, value):
 
 
 def qdump__std__set__QNX(d, value):
-    try:
-        _ = value["_Mypair"]["_Myval2"]["_Myval2"]["_Myproxy"]
+    if d.isDebugBuild is None:
+        try:
+            _ = value["_Mypair"]["_Myval2"]["_Myval2"]["_Myproxy"]
+            d.isDebugBuild = True
+        except Exception:
+            d.isDebugBuild = False
+    if d.isDebugBuild:
         (proxy, head, size) = value.split("ppp")
-    except Exception:
+    else:
         (head, size) = value.split("pp")
     d.check(0 <= size and size <= 100 * 1000 * 1000)
     d.putItemCount(size)
@@ -576,24 +592,28 @@ def qdumpHelper__std__string__QNX(d, value, charType, format):
 
 
 def qdumpHelper__std__string__MSVC(d, value, charType, format):
-    try:
-        _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
-        (proxy, buffer, size, alloc) = value.split("p16spp")
-    except Exception:
-        proxy = None
+    if d.isDebugBuild is None:
+        try:
+            _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
+            d.isDebugBuild = True
+        except Exception:
+            d.isDebugBuild = False
+    if d.isDebugBuild:
+        (_, buffer, size, alloc) = value.split("p16spp")
+    else:
         (buffer, size, alloc) = value.split("16spp")
     d.check(0 <= size and size <= alloc and alloc <= 100 * 1000 * 1000)
     _BUF_SIZE = int(16 / charType.size())
     if _BUF_SIZE <= alloc:
-        if proxy is None:
-            data = value.extractPointer()
-        else:
+        if d.isDebugBuild:
             (proxy, data) = value.split("pp")
-    else:
-        if proxy is None:
-            data = value.address()
         else:
+            data = value.extractPointer()
+    else:
+        if d.isDebugBuild:
             data = value.address() + d.ptrSize()
+        else:
+            data = value.address()
     d.putCharArrayHelper(data, size, charType, format)
 
 
@@ -656,10 +676,15 @@ def qdump__std__unordered_map(d, value):
 
     if d.isMsvcTarget():
         _list = value["_List"]
-        try:
-            _ = _list["_Mypair"]["_Myval2"]["_Myproxy"]
+        if d.isDebugBuild is None:
+            try:
+                _ = _list["_Mypair"]["_Myval2"]["_Myproxy"]
+                d.isDebugBuild = True
+            except Exception:
+                d.isDebugBuild = False
+        if d.isDebugBuild:
             (_, start, size) = _list.split("ppp")
-        except Exception:
+        else:
             (start, size) = _list.split("pp")
     else:
         try:
@@ -894,18 +919,28 @@ def qdumpHelper__std__vector__libcxx(d, value):
 def qdumpHelper__std__vector__msvc(d, value):
     inner_type = value.type[0]
     if inner_type.name == "bool":
-        try:
-            _ = value["_Myproxy"]
+        if d.isDebugBuild is None:
+            try:
+                _ = value["_Myproxy"]
+                d.isDebugBuild = True
+            except RuntimeError:
+                d.isDebugBuild = False
+        if d.isDebugBuild:
             proxy1, proxy2, start, finish, alloc, size = value.split("pppppi")
-        except RuntimeError:
+        else:
             start, finish, alloc, size = value.split("pppi")
         d.check(0 <= size and size <= 1000 * 1000 * 1000)
         qdumpHelper__std__vector__bool(d, start, size, inner_type)
     else:
-        try:
-            _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
+        if d.isDebugBuild is None:
+            try:
+                _ = value["_Mypair"]["_Myval2"]["_Myproxy"]
+                d.isDebugBuild = True
+            except RuntimeError:
+                d.isDebugBuild = False
+        if d.isDebugBuild:
             proxy, start, finish, alloc = value.split("pppp")
-        except RuntimeError:
+        else:
             start, finish, alloc = value.split("ppp")
         size = (finish - start) // inner_type.size()
         d.check(0 <= size and size <= 1000 * 1000 * 1000)