Reference gdb python type printer scripts from SmallString, SmallVector, ArrayRef, and StringRef

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271357 91177308-0d34-0410-b5e6-96231b3b80d8

utils/gdb-scripts/prettyprinters.py

@@ -0,0 +1,107 @@
+import gdb.printing
+class SmallStringPrinter:
+  """Print an llvm::SmallString object."""
+
+  def __init__(self, val):
+    self.val = val
+
+  def to_string(self):
+    begin = self.val['BeginX']
+    end = self.val['EndX']
+    return begin.cast(gdb.lookup_type("char").pointer()).string(length = end - begin)
+
+  def display_hint (self):
+    return 'string'
+
+class StringRefPrinter:
+  """Print an llvm::StringRef object."""
+
+  def __init__(self, val):
+    self.val = val
+
+  def to_string(self):
+    return self.val['Data'].string(length =  self.val['Length'])
+
+  def display_hint (self):
+    return 'string'
+
+class SmallVectorPrinter:
+  """Print an llvm::SmallVector object."""
+
+  class _iterator:
+    def __init__(self, begin, end):
+      self.cur = begin
+      self.end = end
+      self.count = 0
+
+    def __iter__(self):
+      return self
+
+    def next(self):
+      if self.cur == self.end:
+        raise StopIteration
+      count = self.count
+      self.count = self.count + 1
+      cur = self.cur
+      self.cur = self.cur + 1
+      return '[%d]' % count, cur.dereference()
+
+  def __init__(self, val):
+    self.val = val
+
+  def children(self):
+    t = self.val.type.template_argument(0).pointer()
+    begin = self.val['BeginX'].cast(t)
+    end = self.val['EndX'].cast(t)
+    return self._iterator(begin, end)
+
+  def to_string(self):
+    t = self.val.type.template_argument(0).pointer()
+    begin = self.val['BeginX'].cast(t)
+    end = self.val['EndX'].cast(t)
+    capacity = self.val['CapacityX'].cast(t)
+    return 'llvm::SmallVector of length %d, capacity %d' % (end - begin, capacity - begin)
+
+  def display_hint (self):
+    return 'array'
+
+class ArrayRefPrinter:
+  """Print an llvm::ArrayRef object."""
+
+  class _iterator:
+    def __init__(self, begin, end):
+      self.cur = begin
+      self.end = end
+      self.count = 0
+
+    def __iter__(self):
+      return self
+
+    def next(self):
+      if self.cur == self.end:
+        raise StopIteration
+      count = self.count
+      self.count = self.count + 1
+      cur = self.cur
+      self.cur = self.cur + 1
+      return '[%d]' % count, cur.dereference()
+
+  def __init__(self, val):
+    self.val = val
+
+  def children(self):
+    data = self.val['Data']
+    return self._iterator(data, data + self.val['Length'])
+
+  def to_string(self):
+    return 'llvm::ArrayRef of length %d' % (self.val['Length'])
+
+  def display_hint (self):
+    return 'array'
+
+pp = gdb.printing.RegexpCollectionPrettyPrinter("LLVMSupport")
+pp.add_printer('llvm::SmallString', '^llvm::SmallString<.*>$', SmallStringPrinter)
+pp.add_printer('llvm::StringRef', '^llvm::StringRef$', StringRefPrinter)
+pp.add_printer('llvm::SmallVectorImpl', '^llvm::SmallVector(Impl)?<.*>$', SmallVectorPrinter)
+pp.add_printer('llvm::ArrayRef', '^llvm::(Const)?ArrayRef<.*>$', ArrayRefPrinter)
+gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)