Class SsaPhiInputNode
INTERNAL: Do not use.
A node that is used as an input to a phi node.
This class exists to allow more powerful barrier guards. Consider this example:
int x = source();
if(!safe(x)) {
x = clear();
}
// phi node for x here
sink(x);
At the phi node for x
it is neither the case that x
is dominated by
safe(x)
, or is the case that the phi is dominated by a clearing of x
.
By inserting a “phi input” node as the last entry in the basic block that
defines the inputs to the phi we can conclude that each of those inputs are
safe to pass to sink
.
Import path
import semmle.code.cpp.ir.dataflow.internal.DataFlowUtil
Direct supertypes
Indirect supertypes
Predicates
getBlock | Gets the basic block in which this input originates. |
getEnclosingCallable | INTERNAL: Do not use. |
getFunction | Gets the function to which this node belongs, if any. |
getLocationImpl | INTERNAL: Do not use. |
getPhiNode | Gets the phi node associated with this node. |
getSourceVariable | Gets the source variable underlying this phi node. |
getType | Gets the type of this node. |
isGLValue | Holds if this node represents a glvalue. |
toStringImpl | INTERNAL: Do not use. |
Inherited predicates
asConvertedExpr | Gets the expression corresponding to this node, if any. The returned expression may be a | from Node |
asConvertedExpr | Gets the expression corresponding to this node, if any. The returned expression may be a | from Node |
asDefiningArgument | Gets the argument that defines this | from Node |
asDefiningArgument | Gets the argument that defines this | from Node |
asDefinition | Gets the definition associated with this node, if any. | from Node |
asExpr | Gets the non-conversion expression corresponding to this node, if any. This predicate only has a result on nodes that represent the value of evaluating the expression. For data flowing out of an expression, like when an argument is passed by reference, use | from Node |
asExpr | INTERNAL: Do not use. | from Node |
asIndirectArgument | Gets the the argument going into a function for a node that represents the indirect value of the argument after any non-zero number of loads. | from Node |
asIndirectArgument | Gets the the argument going into a function for a node that represents the indirect value of the argument after | from Node |
asIndirectConvertedExpr | Gets the expression that’s indirectly tracked by this node behind a number of indirections. | from Node |
asIndirectConvertedExpr | Gets the expression that’s indirectly tracked by this node behind | from Node |
asIndirectConvertedExpr | INTERNAL: Do not use. | from Node |
asIndirectDefinition | Gets the indirect definition at some indirection corresponding to this node, if any. | from Node |
asIndirectDefinition | Gets the indirect definition at a given indirection corresponding to this node, if any. | from Node |
asIndirectExpr | Gets the non-conversion expression that’s indirectly tracked by this node behind a number of indirections. | from Node |
asIndirectExpr | Gets the non-conversion expression that’s indirectly tracked by this node under | from Node |
asIndirectExpr | INTERNAL: Do not use. | from Node |
asIndirectOperand | Gets the operand that is indirectly tracked by this node behind | from Node |
asIndirectVariable | Gets an indirection of this node’s underlying variable, if any. | from Node |
asIndirectVariable | Gets the | from Node |
asInstruction | Gets the instruction corresponding to this node, if any. | from Node |
asOperand | Gets the operands corresponding to this node, if any. | from Node |
asParameter | Gets the positional parameter corresponding to this node, if any. | from Node |
asParameter | Gets the positional parameter corresponding to the node that represents the value of the parameter after | from Node |
asPartialDefinition | Gets the expression that is partially defined by this node, if any. | from Node |
asUninitialized | Gets the uninitialized local variable corresponding to this node, if any. | from Node |
asVariable | Gets the variable corresponding to this node, if any. This can be used for modeling flow in and out of global variables. | from Node |
getBasicBlock | Gets the basic block of this node, if any. | from Node |
getLocation | Gets the location of this element. | from Node |
getTypeBound | Gets an upper bound on the type of this node. | from Node |
hasIndexInBlock | Holds if this node is at index | from Node |
hasLocationInfo | Holds if this element is at the specified location. The location spans column | from Node |
toString | Gets a textual representation of this element. | from Node |