deps/v8/tools/stats-viewer.py

Summary

Maintainability
C
1 day
Test Coverage

File stats-viewer.py has 341 lines of code (exceeds 250 allowed). Consider refactoring.
Open

#!/usr/bin/env python
#
# Copyright 2008 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
Severity: Minor
Found in deps/v8/tools/stats-viewer.py - About 4 hrs to fix

    Function RebuildMainWindow has a Cognitive Complexity of 14 (exceeds 5 allowed). Consider refactoring.
    Open

      def RebuildMainWindow(self, groups):
        """Tear down and rebuild the main window.
    
        Args:
          groups: the groups of counters to display
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py - About 1 hr to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Function MountSharedData has a Cognitive Complexity of 12 (exceeds 5 allowed). Consider refactoring.
    Open

      def MountSharedData(self):
        """Mount the binary counters file as a memory-mapped file.  If
        something goes wrong print an informative message and exit the
        program."""
        if not os.path.exists(self.data_name):
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py - About 1 hr to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Function UpdateCounters has a Cognitive Complexity of 10 (exceeds 5 allowed). Consider refactoring.
    Open

      def UpdateCounters(self):
        """Read the contents of the memory-mapped file and update the ui if
        necessary.  If the same counters are present in the file as before
        we just update the existing labels.  If any counters have been added
        or removed we scrap the existing ui and draw a new one.
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py - About 1 hr to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Function ComputeCounters has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.
    Open

      def ComputeCounters(self):
        """Group the counters by the suffix of their name.
    
        Since the same code-level counter (for instance "X") can result in
        several variables in the binary counters file that differ only by a
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py - About 25 mins to fix

    Cognitive Complexity

    Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

    A method's cognitive complexity is based on a few simple rules:

    • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
    • Code is considered more complex for each "break in the linear flow of the code"
    • Code is considered more complex when "flow breaking structures are nested"

    Further reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

        while current:
          result += chr(current)
          index += 1
          current = self.data.ByteAt(index)
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py and 1 other location - About 45 mins to fix
    deps/v8/tools/stats-viewer.py on lines 407..410

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 35.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Identical blocks of code found in 2 locations. Consider refactoring.
    Open

        while current:
          result += chr(current)
          index += 1
          current = self.data.ByteAt(index)
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py and 1 other location - About 45 mins to fix
    deps/v8/tools/stats-viewer.py on lines 349..352

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 35.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Similar blocks of code found in 3 locations. Consider refactoring.
    Open

      def __init__(self, data, name_offset, value_offset):
        """Create a new instance.
    
        Args:
          data: the shared data access object containing the counter
    Severity: Minor
    Found in deps/v8/tools/stats-viewer.py and 2 other locations - About 35 mins to fix
    tools/closure_linter/closure_linter/checkerbase.py on lines 46..56
    tools/closure_linter/closure_linter/common/tokenizer.py on lines 40..52

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 33.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

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