Module Essa

Library for SSA representation (Static Single Assignment form).

Import path

import semmle.python.essa.Essa

Imports

Definitions
python

Classes

ArgumentRefinement	A use of a variable as an argument, `foo(v)`, which might modify the object referred to.
AssignmentDefinition	An assignment to a variable `v = val`
AttributeAssignment	An assignment of an attribute `obj.attr = val`
CallsiteRefinement	An implicit (possible) definition of an escaping variable at a call-site
DeletionDefinition	A deletion of a variable `del v`
EssaAttributeDeletion	A deletion of an attribute `del obj.attr`.
EssaDefinition	A definition of an extended-SSA (ESSA) variable. There is exactly one definition for each variable, and exactly one variable for each definition.
EssaEdgeRefinement	An ESSA definition corresponding to an edge refinement of the underlying variable. For example, the edges leaving a test on a variable both represent refinements of that variable. On one edge the test is true, on the other it is false.
EssaNodeDefinition	A definition of an ESSA variable that is not directly linked to another ESSA variable.
EssaNodeRefinement	A definition of an ESSA variable that takes another ESSA variable as an input.
EssaVariable	An (enhanced) SSA variable derived from `SsaSourceVariable`.
ExceptionCapture	A capture of a raised exception `except ExceptionType as ex:`
ExceptionGroupCapture	A capture of a raised exception group `except* ExceptionType as ex:`
ImplicitSubModuleDefinition	An implicit definition of the names of sub-modules in a package. Although the interpreter does not pre-define these names, merely populating them as they are imported, this is a good approximation for static analysis.
ImportStarRefinement	A possible redefinition of variable via `from ... import *`
MethodCallsiteRefinement	An implicit (possible) modification of the object referred at a method call
MultiAssignmentDefinition	An assignment to a variable as part of a multiple assignment `..., v, ... = val`
ParameterDefinition	A definition of a variable by declaring it as a parameter
PatternAliasDefinition	A definition of a variable via a pattern alias
PatternCaptureDefinition	A definition of a variable via a capture pattern
PhiFunction	A Phi-function as specified in classic SSA form.
PyEdgeRefinement	A Python specific sub-class of generic EssaEdgeRefinement
ScopeEntryDefinition	A definition of variable at the entry of a scope. Usually this represents the transfer of a global or non-local variable from one scope to another.
SelfCallsiteRefinement	An implicit (possible) modification of `self` at a method call
SingleSuccessorGuard	A pi-node (guard) with only one successor.
WithDefinition	A definition of a variable in a `with` statement