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llvm-project/debuginfo-tests/dexter/Commands.md

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Dexter commands

DexExpectProgramState

DexExpectProgramState(state [,**times])

Args:
    state (dict): { 'frames': [
                    {
                      # StackFrame #
                      'function': name (str),
                      'is_inlined': bool,
                      'location': {
                        # SourceLocation #
                        'lineno': int,
                        'path': str,
                        'column': int,
                      },
                      'watches': {
                        expr (str): value (str),
                        expr (str): {
                          'value': str,
                          'type_name': str,
                          'could_evaluate': bool,
                          'is_optimized_away': bool,
                          'is_irretrievable': bool,
		    }
                      },
                    }
                  ]}

Keyword args:
    times (int): Minimum number of times this state pattern is expected to
         be seen. Defaults to 1. Can be 0.

Description

Expect to see a given program state a certain number of times.

For every debugger step the reported state is compared with the expected state. To consider the states a match:

  • The SourceLocation must match in both states. Omitted fields in the SourceLocation dictionary are ignored; they always match.
  • Each expr in watches in the expected state can either be a dictionary with the fields shown above, or a string representing its value. In either case, the actual value of expr in the debugger must match.
  • The function name and inline status are not considered.

Heuristic

[TODO]

DexExpectStepKind

DexExpectStepKind(kind, times)

Args:
  kind (str): Expected step kind.
  times (int): Expected number of encounters.

Description

Expect to see a particular step kind a number of times while stepping through the program.

kind must be one of:

FUNC: The first step into a function which is defined in the test directory.
FUNC_EXTERNAL: A step over a function which is not defined in the test directory.
FUNC_UNKNOWN: The first step over a function an unknown definition location.
VERTICAL_FORWARD: A step onto a line after the previous step line in this frame.
VERTICAL_BACKWARD: A step onto a line before the previous step line in this frame.
HORIZONTAL_FORWARD: A step forward on the same line as the previous step in this frame.
HORIZONTAL_BACKWARD: A step backward on the same line as the previous step in this frame.
SAME: A step onto the same line and column as the previous step in this frame.

Heuristic

[TODO]

DexExpectStepOrder

DexExpectStepOrder(*order)

Arg list:
  order (int): One or more indices.

Description

Expect the line every DexExpectStepOrder is found on to be stepped on in order. Each instance must have a set of unique ascending indices.

Heuristic

[TODO]

DexExpectWatchType

DexExpectWatchType(expr, *types [,**from_line=1][,**to_line=Max]
                    [,**on_line][,**require_in_order=True])

Args:
    expr (str): expression to evaluate.

Arg list:
    types (str): At least one expected type. NOTE: string type.

Keyword args:
    from_line (int): Evaluate the expression from this line. Defaults to 1.
    to_line (int): Evaluate the expression to this line. Defaults to end of
        source.
    on_line (int): Only evaluate the expression on this line. If provided,
        this overrides from_line and to_line.
    require_in_order (bool): If False the values can appear in any order.

Description

Expect the expression expr to evaluate be evaluated and have each evaluation's type checked against the list of types

Heuristic

[TODO]

DexExpectWatchValue

DexExpectWatchValue(expr, *values [,**from_line=1][,**to_line=Max]
                    [,**on_line][,**require_in_order=True])

Args:
    expr (str): expression to evaluate.

Arg list:
    values (str): At least one expected value. NOTE: string type.

Keyword args:
    from_line (int): Evaluate the expression from this line. Defaults to 1.
    to_line (int): Evaluate the expression to this line. Defaults to end of
        source.
    on_line (int): Only evaluate the expression on this line. If provided,
        this overrides from_line and to_line.
    require_in_order (bool): If False the values can appear in any order.

Description

Expect the expression expr to evaluate to the list of values sequentially.

Heuristic

[TODO]

DexUnreachable

DexUnreachable()

Description

Expect the source line this is found on will never be stepped on to.

Heuristic

[TODO]

DexLimitSteps

DexLimitSteps(expr, *values [, **from_line=1],[,**to_line=Max]
              [,**on_line])

Args:
    expr (str): variable or value to compare.

Arg list:
    values (str): At least one potential value the expr may evaluate to.

Keyword args:
    from_line (int): Define the start of the limited step range.
    to_line (int): Define the end of the limited step range.
    on_line (int): Define a range with length 1 starting and ending on the
                   same line.

Description

Define a limited stepping range that is predicated on a condition. When '(expr) == (values[n])', set a range of temporary, unconditional break points within the test file defined by the range from_line and to_line or on_line.

The condition is only evaluated on the line 'from_line' or 'on_line'. If the condition is not true at the start of the range, the whole range is ignored.

DexLimitSteps commands are useful for reducing the amount of steps gathered in large test cases that would normally take much longer to complete.

DexLabel

DexLabel(name)

Args:
    name (str): A unique name for this line.

Description

Name the line this command is found on. Line names can be referenced by other commands expecting line number arguments. For example, DexExpectWatchValues(..., on_line='my_line_name').

Heuristic

This command does not contribute to the heuristic score.

DexWatch

DexWatch(*expressions)

Arg list:
    expressions (str): `expression` to evaluate on this line.

Description

[Deprecated] Evaluate each given expression when the debugger steps onto the line this command is found on.

Heuristic

[Deprecated]