[Dy2Stat]Modify dy2stat error message in runtime and format error mes…

…sage (#35365)

python/paddle/fluid/dygraph/dygraph_to_static/error.py

@@ -17,6 +17,7 @@
 import sys
 import traceback
 import linecache
+import re
 
 from paddle.fluid.dygraph.dygraph_to_static.origin_info import Location, OriginInfo, global_origin_info_map
 
@@ -106,22 +107,34 @@ def __init__(self, location, function_name):
         begin_lineno = max(1, self.location.lineno - int(SOURCE_CODE_RANGE / 2))
 
         for i in range(begin_lineno, begin_lineno + SOURCE_CODE_RANGE):
-            line = linecache.getline(self.location.filepath, i)
-            line_lstrip = line.strip()
+            line = linecache.getline(self.location.filepath, i).rstrip('\n')
+            line_lstrip = line.lstrip()
             self.source_code.append(line_lstrip)
-            blank_count.append(len(line) - len(line_lstrip))
+            if not line_lstrip:  # empty line from source code
+                blank_count.append(-1)
+            else:
+                blank_count.append(len(line) - len(line_lstrip))
 
             if i == self.location.lineno:
                 hint_msg = '~' * len(self.source_code[-1]) + ' <--- HERE'
                 self.source_code.append(hint_msg)
                 blank_count.append(blank_count[-1])
         linecache.clearcache()
-
-        min_black_count = min(blank_count)
+        # remove top and bottom empty line in source code
+        while len(self.source_code) > 0 and not self.source_code[0]:
+            self.source_code.pop(0)
+            blank_count.pop(0)
+        while len(self.source_code) > 0 and not self.source_code[-1]:
+            self.source_code.pop(-1)
+            blank_count.pop(-1)
+
+        min_black_count = min([i for i in blank_count if i >= 0])
         for i in range(len(self.source_code)):
-            self.source_code[i] = ' ' * (blank_count[i] - min_black_count +
-                                         BLANK_COUNT_BEFORE_FILE_STR * 2
-                                         ) + self.source_code[i]
+            # if source_code[i] is empty line between two code line, dont add blank
+            if self.source_code[i]:
+                self.source_code[i] = ' ' * (blank_count[i] - min_black_count +
+                                             BLANK_COUNT_BEFORE_FILE_STR * 2
+                                             ) + self.source_code[i]
 
     def formated_message(self):
         msg = ' ' * BLANK_COUNT_BEFORE_FILE_STR + 'File "{}", line {}, in {}\n'.format(
@@ -212,16 +225,51 @@ def _simplify_error_value(self):
             1. Need a more robust way because the code of start_trace may change.
             2. Set the switch to determine whether to simplify error_value
         """
+
         assert self.in_runtime is True
 
         error_value_lines = str(self.error_value).split("\n")
         error_value_lines_strip = [mes.lstrip(" ") for mes in error_value_lines]
 
         start_trace = "outputs = static_func(*inputs)"
         start_idx = error_value_lines_strip.index(start_trace)
+
         error_value_lines = error_value_lines[start_idx + 1:]
+        error_value_lines_strip = error_value_lines_strip[start_idx + 1:]
+
+        # use empty line to locate the bottom_error_message
+        empty_line_idx = error_value_lines_strip.index('')
+        bottom_error_message = error_value_lines[empty_line_idx + 1:]
+
+        filepath = ''
+        error_from_user_code = []
+        pattern = 'File "(?P<filepath>.+)", line (?P<lineno>.+), in (?P<function_name>.+)'
+        for i in range(0, len(error_value_lines_strip), 2):
+            if error_value_lines_strip[i].startswith("File "):
+                re_result = re.search(pattern, error_value_lines_strip[i])
+                tmp_filepath, lineno_str, function_name = re_result.groups()
+                code = error_value_lines_strip[i + 1] if i + 1 < len(
+                    error_value_lines_strip) else ''
+                if i == 0:
+                    filepath = tmp_filepath
+                if tmp_filepath == filepath:
+                    error_from_user_code.append(
+                        (tmp_filepath, int(lineno_str), function_name, code))
+
+        error_frame = []
+        whether_source_range = True
+        for filepath, lineno, funcname, code in error_from_user_code[::-1]:
+            loc = Location(filepath, lineno)
+            if whether_source_range:
+                traceback_frame = TraceBackFrameRange(loc, funcname)
+                whether_source_range = False
+            else:
+                traceback_frame = TraceBackFrame(loc, funcname, code)
+
+            error_frame.insert(0, traceback_frame.formated_message())
 
-        error_value_str = '\n'.join(error_value_lines)
+        error_frame.extend(bottom_error_message)
+        error_value_str = '\n'.join(error_frame)
         self.error_value = self.error_type(error_value_str)
 
     def raise_new_exception(self):

python/paddle/fluid/tests/unittests/dygraph_to_static/test_error.py

@@ -98,6 +98,16 @@ def test_func(self):
         return
 
 
+@paddle.jit.to_static
+def func_error_in_runtime_with_empty_line(x):
+    x = fluid.dygraph.to_variable(x)
+    two = fluid.layers.fill_constant(shape=[1], value=2, dtype="int32")
+
+    x = fluid.layers.reshape(x, shape=[1, two])
+
+    return x
+
+
 class TestFlags(unittest.TestCase):
     def setUp(self):
         self.reset_flags_to_default()
@@ -293,7 +303,26 @@ def set_message(self):
         self.expected_message = \
             [
                 'File "{}", line 54, in func_error_in_runtime'.format(self.filepath),
-                'x = fluid.layers.reshape(x, shape=[1, two])'
+                'x = fluid.dygraph.to_variable(x)',
+                'two = fluid.layers.fill_constant(shape=[1], value=2, dtype="int32")',
+                'x = fluid.layers.reshape(x, shape=[1, two])',
+                '<--- HERE',
+                'return x'
+            ]
+
+
+class TestErrorStaticLayerCallInRuntime2(TestErrorStaticLayerCallInRuntime):
+    def set_func(self):
+        self.func = func_error_in_runtime_with_empty_line
+
+    def set_message(self):
+        self.expected_message = \
+            [
+                'File "{}", line 106, in func_error_in_runtime_with_empty_line'.format(self.filepath),
+                'two = fluid.layers.fill_constant(shape=[1], value=2, dtype="int32")',
+                'x = fluid.layers.reshape(x, shape=[1, two])',
+                '<--- HERE',
+                'return x'
             ]