Class Ssa::PhiNode

A phi node. For example, in

if b
  x = 0
else
  x = 1
end
puts x

a phi node for x is inserted just before the call puts x.

Import path

import codeql.ruby.dataflow.SSA

Direct supertypes

Indirect supertypes

Predicates

getAnInput	Gets an input of this phi node.
getLocation	Gets the location of this SSA definition.
hasInputFromBlock	Holds if `inp` is an input to this phi node along the edge originating in `bb`.
toString	Gets a textual representation of this SSA definition.

Inherited predicates

definesAt	Holds if this SSA definition defines `v` at index `i` in basic block `bb`. Phi nodes are considered to be at index `-1`, while normal variable writes are at the index of the control flow node they wrap.	from Definition
getAFirstRead	Gets a first control-flow node that reads the value of this SSA definition. That is, a read that can be reached from this definition without passing through other reads.	from Definition
getALastRead	Gets a last control-flow node that reads the value of this SSA definition. That is, a read that can reach the end of the enclosing CFG scope, or another SSA definition for the source variable, without passing through any other read.	from Definition
getARead	Gets a control-flow node that reads the value of this SSA definition.	from Definition
getAnUltimateDefinition	Gets a definition that ultimately defines this SSA definition and is not itself a phi node.	from Definition
getBasicBlock	Gets the basic block to which this SSA definition belongs.	from Definition
getControlFlowNode	Gets the control flow node of this SSA definition, if any. Phi nodes are examples of SSA definitions without a control flow node, as they are modeled at index `-1` in the relevant basic block.	from Definition
getScope	Gets the scope of this SSA definition.	from Definition
getSourceVariable	Gets the source variable underlying this SSA definition.	from Definition
hasAdjacentReads	Holds if `read1` and `read2` are adjacent reads of this SSA definition. That is, `read2` can be reached from `read1` without passing through another read.	from Definition