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Expr.qll
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2787 lines (2335 loc) · 96.3 KB
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/**
* Provides classes for working with Java expressions.
*/
overlay[local?]
module;
import java
private import semmle.code.java.frameworks.android.Compose
private import semmle.code.java.Constants
private import semmle.code.java.Overlay
/** A common super-class that represents all kinds of expressions. */
class Expr extends ExprParent, @expr {
/*abstract*/ override string toString() { result = "expr" }
/**
* Gets the callable in which this expression occurs, if any.
*/
Callable getEnclosingCallable() { callableEnclosingExpr(this, result) }
/** Gets the index of this expression as a child of its parent. */
int getIndex() { exprs(this, _, _, _, result) }
/** Gets the parent of this expression. */
ExprParent getParent() { exprs(this, _, _, result, _) }
/** Holds if this expression is the child of the specified parent at the specified (zero-based) position. */
predicate isNthChildOf(ExprParent parent, int index) { exprs(this, _, _, parent, index) }
/** Gets the type of this expression. */
Type getType() { exprs(this, _, result, _, _) }
/** Gets the Kotlin type of this expression. */
KotlinType getKotlinType() { exprsKotlinType(this, result) }
/** Gets the compilation unit in which this expression occurs. */
CompilationUnit getCompilationUnit() { result = this.getFile() }
/**
* Gets the kind of this expression.
*
* Each kind of expression has a unique (integer) identifier.
* This is an implementation detail that should not normally
* be referred to by library users, since the kind of an expression
* is also represented by its QL type.
*
* In a few rare situations, referring to the kind of an expression
* via its unique identifier may be appropriate; for example, when
* comparing whether two expressions have the same kind (as opposed
* to checking whether an expression has a particular kind).
*/
int getKind() { exprs(this, result, _, _, _) }
/** Gets the statement containing this expression, if any. */
Stmt getEnclosingStmt() { statementEnclosingExpr(this, result) }
/**
* Gets a statement that directly or transitively contains this expression, if any.
* This is equivalent to `this.getEnclosingStmt().getEnclosingStmt*()`.
*/
Stmt getAnEnclosingStmt() { result = this.getEnclosingStmt().getEnclosingStmt*() }
/** Gets a child of this expression. */
Expr getAChildExpr() { exprs(result, _, _, this, _) }
/** Gets the basic block in which this expression occurs, if any. */
BasicBlock getBasicBlock() { result.getANode().asExpr() = this }
/** Gets the `ControlFlowNode` corresponding to this expression. */
ControlFlowNode getControlFlowNode() { result.asExpr() = this }
/** This statement's Halstead ID (used to compute Halstead metrics). */
string getHalsteadID() { result = this.toString() }
/**
* Holds if this expression is a compile-time constant.
*
* See JLS v8, section 15.28 (Constant Expressions).
*/
predicate isCompileTimeConstant() { this instanceof CompileTimeConstantExpr }
/** Holds if this expression occurs in a static context. */
predicate isInStaticContext() {
/*
* JLS 8.1.3 (Inner Classes and Enclosing Instances)
* A statement or expression occurs in a static context if and only if the
* innermost method, constructor, instance initializer, static initializer,
* field initializer, or explicit constructor invocation statement
* enclosing the statement or expression is a static method, a static
* initializer, the variable initializer of a static variable, or an
* explicit constructor invocation statement.
*/
this.getEnclosingCallable().isStatic()
or
this.getParent+() instanceof ThisConstructorInvocationStmt
or
this.getParent+() instanceof SuperConstructorInvocationStmt
or
exists(LambdaExpr lam |
lam.asMethod() = this.getEnclosingCallable() and lam.isInStaticContext()
)
}
/** Holds if this expression is parenthesized. */
predicate isParenthesized() { isParenthesized(this, _) }
/**
* Gets the underlying expression looking through casts and not-nulls, if any.
* Otherwise just gets this expression.
*/
Expr getUnderlyingExpr() {
if this instanceof CastingExpr or this instanceof NotNullExpr
then
result = this.(CastingExpr).getExpr().getUnderlyingExpr() or
result = this.(NotNullExpr).getOperand().getUnderlyingExpr()
else result = this
}
}
/**
* Holds if the specified type is either a primitive type or type `String`.
*
* Auxiliary predicate used by `CompileTimeConstantExpr`.
*/
private predicate primitiveOrString(Type t) {
t instanceof PrimitiveType or
t instanceof TypeString
}
/**
* A compile-time constant expression.
*
* See JLS v8, section 15.28 (Constant Expressions).
*/
class CompileTimeConstantExpr extends Expr {
CompileTimeConstantExpr() {
primitiveOrString(this.getType()) and
(
// Literals of primitive type and literals of type `String`.
this instanceof Literal
or
// Casts to primitive types and casts to type `String`.
this.(CastingExpr).getExpr().isCompileTimeConstant()
or
// The unary operators `+`, `-`, `~`, and `!` (but not `++` or `--`).
this.(PlusExpr).getOperand().isCompileTimeConstant()
or
this.(MinusExpr).getOperand().isCompileTimeConstant()
or
this.(BitNotExpr).getOperand().isCompileTimeConstant()
or
this.(LogNotExpr).getOperand().isCompileTimeConstant()
or
// The multiplicative operators `*`, `/`, and `%`,
// the additive operators `+` and `-`,
// the shift operators `<<`, `>>`, and `>>>`,
// the relational operators `<`, `<=`, `>`, and `>=` (but not `instanceof`),
// the equality operators `==` and `!=`,
// the bitwise and logical operators `&`, `^`, and `|`,
// the conditional-and operator `&&` and the conditional-or operator `||`.
// These are precisely the operators represented by `BinaryExpr`.
this.(BinaryExpr).getLeftOperand().isCompileTimeConstant() and
this.(BinaryExpr).getRightOperand().isCompileTimeConstant()
or
// The ternary conditional operator ` ? : `.
exists(ConditionalExpr e | this = e |
e.getCondition().isCompileTimeConstant() and
e.getThen().isCompileTimeConstant() and
e.getElse().isCompileTimeConstant()
)
or
// Access to a final variable initialized by a compile-time constant.
exists(Variable v | this = v.getAnAccess() |
v.isFinal() and
v.getInitializer().isCompileTimeConstant()
)
or
this instanceof LiveLiteral
)
}
/**
* Gets the string value of this expression, where possible.
*/
cached
string getStringValue() {
result = this.(StringLiteral).getValue()
or
result =
this.(AddExpr).getLeftOperand().(CompileTimeConstantExpr).getStringValue() +
this.(AddExpr).getRightOperand().(CompileTimeConstantExpr).getStringValue()
or
// Ternary conditional, with compile-time constant condition.
exists(ConditionalExpr ce, boolean condition |
ce = this and
condition = ce.getCondition().(CompileTimeConstantExpr).getBooleanValue() and
result = ce.getBranchExpr(condition).(CompileTimeConstantExpr).getStringValue()
)
or
exists(Variable v | this = v.getAnAccess() |
result = v.getInitializer().(CompileTimeConstantExpr).getStringValue()
)
or
result = this.(LiveLiteral).getValue().getStringValue()
}
/**
* Gets the boolean value of this expression, where possible.
*/
cached
boolean getBooleanValue() {
// Literal value.
result = this.(BooleanLiteral).getBooleanValue()
or
result = CalcCompileTimeConstants::calculateBooleanValue(this)
or
// Handle binary expressions that have `String` operands and a boolean result.
exists(BinaryExpr b, string left, string right |
b = this and
left = b.getLeftOperand().(CompileTimeConstantExpr).getStringValue() and
right = b.getRightOperand().(CompileTimeConstantExpr).getStringValue()
|
/*
* JLS 15.28 specifies that compile-time `String` constants are interned. Therefore `==`
* equality can be interpreted as equality over the constant values, not the references.
*
* Kotlin's `==` and `===` operators will return the same result for `String`s, so they
* can be handled alike:
*/
(
b instanceof ValueOrReferenceEqualsExpr and
if left = right then result = true else result = false
)
or
(
b instanceof ValueOrReferenceNotEqualsExpr and
if left != right then result = true else result = false
)
)
or
// Note: no `getFloatValue()`, so we cannot support binary expressions with float or double operands.
result = this.(LiveLiteral).getValue().getBooleanValue()
}
/**
* Gets the integer value of this expression, where possible.
*
* Note that this does not handle the following cases:
*
* - values of type `long`.
*/
cached
int getIntValue() {
exists(IntegralType t | this.getType() = t | t.getName().toLowerCase() != "long") and
(
result = this.(IntegerLiteral).getIntValue()
or
result = this.(CharacterLiteral).getCodePointValue()
)
or
result = CalcCompileTimeConstants::calculateIntValue(this)
or
result = this.(LiveLiteral).getValue().getIntValue()
}
}
private boolean getBoolValue(Expr e) { result = e.(CompileTimeConstantExpr).getBooleanValue() }
private int getIntValue(Expr e) { result = e.(CompileTimeConstantExpr).getIntValue() }
private module CalcCompileTimeConstants = CalculateConstants<getBoolValue/1, getIntValue/1>;
/** An expression parent is an element that may have an expression as its child. */
class ExprParent extends @exprparent, Top { }
/**
* An error expression.
*
* These may be generated by upgrade or downgrade scripts when databases
* cannot be fully converted, or generated by the extractor when extracting
* source code containing errors.
*/
class ErrorExpr extends Expr, @errorexpr {
override string toString() { result = "<error expr>" }
override string getAPrimaryQlClass() { result = "ErrorExpr" }
}
/**
* An array access.
*
* For example, `a[i++]` is an array access, where
* `a` is the accessed array and `i++` is
* the index expression of the array access.
*/
class ArrayAccess extends Expr, @arrayaccess {
/** Gets the array that is accessed in this array access. */
Expr getArray() { result.isNthChildOf(this, 0) }
/** Gets the index expression of this array access. */
Expr getIndexExpr() { result.isNthChildOf(this, 1) }
override string toString() { result = "...[...]" }
override string getAPrimaryQlClass() { result = "ArrayAccess" }
}
/**
* An array creation expression.
*
* For example, an expression such as `new String[2][3]` or
* `new String[][] { { "a", "b", "c" } , { "d", "e", "f" } }`.
*
* In both examples, `String` is the type name. In the first
* example, `2` and `3` are the 0th and 1st dimensions,
* respectively. In the second example,
* `{ { "a", "b", "c" } , { "d", "e", "f" } }` is the initializer.
*/
class ArrayCreationExpr extends Expr, @arraycreationexpr {
/** Gets a dimension of this array creation expression. */
Expr getADimension() { result.getParent() = this and result.getIndex() >= 0 }
/** Gets the dimension of this array creation expression at the specified (zero-based) position. */
Expr getDimension(int index) {
result = this.getADimension() and
result.getIndex() = index
}
/** Gets the initializer of this array creation expression, if any. */
ArrayInit getInit() { result.isNthChildOf(this, -2) }
/**
* Gets the size of the first dimension, if it can be statically determined.
*/
int getFirstDimensionSize() {
if exists(this.getInit())
then result = this.getInit().getSize()
else result = this.getDimension(0).(CompileTimeConstantExpr).getIntValue()
}
/** Gets a printable representation of this expression. */
override string toString() { result = "new " + this.getType().toString() }
override string getAPrimaryQlClass() { result = "ArrayCreationExpr" }
}
/**
* An array initializer consisting of an opening and closing curly bracket and
* optionally containing expressions (which themselves can be array initializers)
* representing the elements of the array. For example: `{ 'a', 'b' }`.
*
* This expression type matches array initializers representing the values for
* annotation elements as well, despite the Java Language Specification considering
* them a separate type, `ElementValueArrayInitializer`. It does however not match
* values for an array annotation element which consist of a single element
* without enclosing curly brackets (as per JLS).
*/
class ArrayInit extends Expr, @arrayinit {
/**
* An expression occurring in this initializer.
* This may either be an initializer itself or an
* expression representing an element of the array,
* depending on the level of nesting.
*/
Expr getAnInit() { result.getParent() = this }
/** Gets the initializer occurring at the specified (zero-based) position. */
Expr getInit(int index) { result = this.getAnInit() and result.getIndex() = index }
/**
* Gets the number of expressions in this initializer, that is, the size the
* created array will have.
*/
int getSize() { result = count(this.getAnInit()) }
/** Gets a printable representation of this expression. */
override string toString() { result = "{...}" }
override string getAPrimaryQlClass() { result = "ArrayInit" }
}
/**
* A common super-class that represents many varieties of assignments.
*
* This does not cover unary assignments such as `i++`, and initialization of
* local variables at their declaration such as `int i = 0;`.
*
* To cover more cases of variable updates, see the classes `VariableAssign`,
* `VariableUpdate` and `VarWrite`. But consider that they don't cover array
* element assignments since there the assignment destination is not directly
* the array variable but instead an `ArrayAccess`.
*/
class Assignment extends BinaryExpr, @assignment {
/** Gets the destination (left-hand side) of the assignment. */
Expr getDest() { result.isNthChildOf(this, 0) }
/**
* Gets the source (right-hand side) of the assignment.
*
* For assignments with an implicit operator such as `x += 23`,
* the left-hand side is also a source.
*/
Expr getSource() { result.isNthChildOf(this, 1) }
/** Gets the right-hand side of the assignment. */
Expr getRhs() { result.isNthChildOf(this, 1) }
/** Gets a printable representation of this expression. */
override string toString() { result = "...=..." }
}
/**
* A simple assignment expression using the `=` operator.
*
* For example, `x = 23`.
*/
class AssignExpr extends Assignment, @assignexpr {
override string getOp() { result = "=" }
override string getAPrimaryQlClass() { result = "AssignExpr" }
}
/**
* A Kotlin class member initializer assignment.
*
* For example, `class X { val y = 1 }`
*/
class KtInitializerAssignExpr extends AssignExpr {
KtInitializerAssignExpr() { ktInitializerAssignment(this) }
override string getAPrimaryQlClass() { result = "KtInitializerAssignExpr" }
}
/**
* A common super-class to represent compound assignments, which include an implicit operator.
*
* For example, the compound assignment `x += 23`
* uses `+` as the implicit operator.
*/
class AssignOp extends Assignment, @assignop {
/**
* Gets a source of the compound assignment, which includes both the right-hand side
* and the left-hand side of the assignment.
*/
override Expr getSource() { result.getParent() = this }
/** Gets a string representation of the assignment operator of this compound assignment. */
/*abstract*/ override string getOp() { result = "??=" }
/** Gets a printable representation of this expression. */
override string toString() { result = "..." + this.getOp() + "..." }
}
/** A compound assignment expression using the `+=` operator. */
class AssignAddExpr extends AssignOp, @assignaddexpr {
override string getOp() { result = "+=" }
override string getAPrimaryQlClass() { result = "AssignAddExpr" }
}
/** A compound assignment expression using the `-=` operator. */
class AssignSubExpr extends AssignOp, @assignsubexpr {
override string getOp() { result = "-=" }
override string getAPrimaryQlClass() { result = "AssignSubExpr" }
}
/** A compound assignment expression using the `*=` operator. */
class AssignMulExpr extends AssignOp, @assignmulexpr {
override string getOp() { result = "*=" }
override string getAPrimaryQlClass() { result = "AssignMulExpr" }
}
/** A compound assignment expression using the `/=` operator. */
class AssignDivExpr extends AssignOp, @assigndivexpr {
override string getOp() { result = "/=" }
override string getAPrimaryQlClass() { result = "AssignDivExpr" }
}
/** A compound assignment expression using the `%=` operator. */
class AssignRemExpr extends AssignOp, @assignremexpr {
override string getOp() { result = "%=" }
override string getAPrimaryQlClass() { result = "AssignRemExpr" }
}
/** A compound assignment expression using the `&=` operator. */
class AssignAndExpr extends AssignOp, @assignandexpr {
override string getOp() { result = "&=" }
override string getAPrimaryQlClass() { result = "AssignAndExpr" }
}
/** A compound assignment expression using the `|=` operator. */
class AssignOrExpr extends AssignOp, @assignorexpr {
override string getOp() { result = "|=" }
override string getAPrimaryQlClass() { result = "AssignOrExpr" }
}
/** A compound assignment expression using the `^=` operator. */
class AssignXorExpr extends AssignOp, @assignxorexpr {
override string getOp() { result = "^=" }
override string getAPrimaryQlClass() { result = "AssignXorExpr" }
}
/** A compound assignment expression using the `<<=` operator. */
class AssignLeftShiftExpr extends AssignOp, @assignlshiftexpr {
override string getOp() { result = "<<=" }
override string getAPrimaryQlClass() { result = "AssignLeftShiftExpr" }
}
/** A compound assignment expression using the `>>=` operator. */
class AssignRightShiftExpr extends AssignOp, @assignrshiftexpr {
override string getOp() { result = ">>=" }
override string getAPrimaryQlClass() { result = "AssignRightShiftExpr" }
}
/** A compound assignment expression using the `>>>=` operator. */
class AssignUnsignedRightShiftExpr extends AssignOp, @assignurshiftexpr {
override string getOp() { result = ">>>=" }
override string getAPrimaryQlClass() { result = "AssignUnsignedRightShiftExpr" }
}
/** A common super-class to represent constant literals. */
class Literal extends Expr, @literal {
/**
* Gets a string representation of this literal as it appeared
* in the source code.
*
* For Kotlin the result might not match the exact representation
* used in the source code.
*
* **Important:** Unless a query explicitly wants to check how
* a literal was written in the source code, the predicate
* `getValue()` (or value predicates of subclasses) should be
* used instead. For example for the integer literal `0x7fff_ffff`
* the result of `getLiteral()` would be `0x7fff_ffff`, while
* the result of `getValue()` would be `2147483647`.
*/
string getLiteral() { namestrings(result, _, this) }
/**
* Gets a string representation of the value this literal
* represents.
*/
string getValue() { namestrings(_, result, this) }
/** Gets a printable representation of this expression. */
override string toString() { result = this.getLiteral() }
/** Holds if this literal is a compile-time constant expression (as per JLS v8, section 15.28). */
override predicate isCompileTimeConstant() {
this.getType() instanceof PrimitiveType or
this.getType() instanceof TypeString
}
}
/** A boolean literal. Either `true` or `false`. */
class BooleanLiteral extends Literal, @booleanliteral {
/** Gets the boolean representation of this literal. */
boolean getBooleanValue() {
result = true and this.getValue() = "true"
or
result = false and this.getValue() = "false"
}
override string getAPrimaryQlClass() { result = "BooleanLiteral" }
}
/**
* An integer literal. For example, `23`.
*
* An integer literal can never be negative except when:
* - It is written in binary, octal or hexadecimal notation
* - It is written in decimal notation, has the value `2147483648` and is preceded
* by a minus; in this case the value of the IntegerLiteral is -2147483648 and
* the preceding minus will *not* be modeled as `MinusExpr`.
*
* In all other cases the preceding minus, if any, will be modeled as a separate
* `MinusExpr`.
*
* The last exception is necessary because `2147483648` on its own would not be
* a valid integer literal (and could also not be parsed as CodeQL `int`).
*/
class IntegerLiteral extends Literal, @integerliteral {
/** Gets the int representation of this literal. */
int getIntValue() { result = this.getValue().toInt() }
override string getAPrimaryQlClass() { result = "IntegerLiteral" }
}
/**
* A long literal. For example, `23L`.
*
* A long literal can never be negative except when:
* - It is written in binary, octal or hexadecimal notation
* - It is written in decimal notation, has the value `9223372036854775808` and
* is preceded by a minus; in this case the value of the LongLiteral is
* -9223372036854775808 and the preceding minus will *not* be modeled as
* `MinusExpr`.
*
* In all other cases the preceding minus, if any, will be modeled as a separate
* `MinusExpr`.
*
* The last exception is necessary because `9223372036854775808` on its own
* would not be a valid long literal.
*/
class LongLiteral extends Literal, @longliteral {
override string getAPrimaryQlClass() { result = "LongLiteral" }
}
/**
* A float literal. For example, `4.2f`.
*
* A float literal is never negative; a preceding minus, if any, will always
* be modeled as separate `MinusExpr`.
*/
class FloatLiteral extends Literal, @floatingpointliteral {
/**
* Gets the value of this literal as CodeQL 64-bit `float`. The value will
* be parsed as Java 32-bit `float` and then converted to a CodeQL `float`.
*/
float getFloatValue() { result = this.getValue().toFloat() }
override string getAPrimaryQlClass() { result = "FloatLiteral" }
}
/**
* A double literal. For example, `4.2`.
*
* A double literal is never negative; a preceding minus, if any, will always
* be modeled as separate `MinusExpr`.
*/
class DoubleLiteral extends Literal, @doubleliteral {
/**
* Gets the value of this literal as CodeQL 64-bit `float`. The result will
* have the same effective value as the Java `double` literal.
*/
float getDoubleValue() { result = this.getValue().toFloat() }
override string getAPrimaryQlClass() { result = "DoubleLiteral" }
}
bindingset[s]
private int fromHex(string s) {
exists(string digits | s.toUpperCase() = digits |
result =
sum(int i |
|
"0123456789ABCDEF".indexOf(digits.charAt(i)).bitShiftLeft((digits.length() - i - 1) * 4)
)
)
}
/** A character literal. For example, `'\n'`. */
class CharacterLiteral extends Literal, @characterliteral {
override string getAPrimaryQlClass() { result = "CharacterLiteral" }
/**
* Gets a string which consists of the single character represented by
* this literal.
*
* Unicode surrogate characters (U+D800 to U+DFFF) have the replacement character
* U+FFFD as result instead.
*/
override string getValue() { result = super.getValue() }
/**
* Gets the Unicode code point value of the character represented by
* this literal. The result is the same as if the Java code had cast
* the character to an `int`.
*/
int getCodePointValue() {
if this.getLiteral().matches("'\\u____'")
then result = fromHex(this.getLiteral().substring(3, 7))
else result.toUnicode() = this.getValue()
}
}
/**
* A string literal or text block (Java 15 feature). For example, `"hello world"`
* or
* ```java
* """
* Text with "quotes"
* """
* ```
*/
class StringLiteral extends Literal, @stringliteral {
/**
* Gets the string represented by this string literal, that is, the content
* of the literal without enclosing quotes and with escape sequences translated.
*
* Unpaired Unicode surrogate characters (U+D800 to U+DFFF) are replaced with the
* replacement character U+FFFD.
*/
override string getValue() { result = super.getValue() }
/** Holds if this string literal is a text block (`""" ... """`). */
predicate isTextBlock() { this.getLiteral().matches("\"\"\"%") }
override string getAPrimaryQlClass() { result = "StringLiteral" }
}
/** The null literal, written `null`. */
class NullLiteral extends Literal, @nullliteral {
// Override these predicates because the inherited ones have no result
override string getLiteral() { result = "null" }
override string getValue() { result = "null" }
override string getAPrimaryQlClass() { result = "NullLiteral" }
}
/** A common super-class to represent binary operator expressions. */
class BinaryExpr extends Expr, @binaryexpr {
/** Gets the operand on the left-hand side of this binary expression. */
Expr getLeftOperand() { result.isNthChildOf(this, 0) }
/** Gets the operand on the right-hand side of this binary expression. */
Expr getRightOperand() { result.isNthChildOf(this, 1) }
/** Gets an operand (left or right). */
Expr getAnOperand() { result = this.getLeftOperand() or result = this.getRightOperand() }
/** The operands of this binary expression are `e` and `f`, in either order. */
predicate hasOperands(Expr e, Expr f) {
exists(int i | i in [0 .. 1] |
e.isNthChildOf(this, i) and
f.isNthChildOf(this, 1 - i)
)
}
/** Gets a printable representation of this expression. */
override string toString() { result = "... " + this.getOp() + " ..." }
/** Gets a string representation of the operator of this binary expression. */
/*abstract*/ string getOp() { result = "??" }
}
/** A binary expression using the `*` operator. */
class MulExpr extends BinaryExpr, @mulexpr {
override string getOp() { result = "*" }
override string getAPrimaryQlClass() { result = "MulExpr" }
}
/** A binary expression using the `/` operator. */
class DivExpr extends BinaryExpr, @divexpr {
override string getOp() { result = "/" }
override string getAPrimaryQlClass() { result = "DivExpr" }
}
/** A binary expression using the `%` operator. */
class RemExpr extends BinaryExpr, @remexpr {
override string getOp() { result = "%" }
override string getAPrimaryQlClass() { result = "RemExpr" }
}
/** A binary expression using the `+` operator. */
class AddExpr extends BinaryExpr, @addexpr {
override string getOp() { result = "+" }
override string getAPrimaryQlClass() { result = "AddExpr" }
}
/** A binary expression using the `-` operator. */
class SubExpr extends BinaryExpr, @subexpr {
override string getOp() { result = "-" }
override string getAPrimaryQlClass() { result = "SubExpr" }
}
/** A binary expression using the `<<` operator. */
class LeftShiftExpr extends BinaryExpr, @lshiftexpr {
override string getOp() { result = "<<" }
override string getAPrimaryQlClass() { result = "LeftShiftExpr" }
}
/** A binary expression using the `>>` operator. */
class RightShiftExpr extends BinaryExpr, @rshiftexpr {
override string getOp() { result = ">>" }
override string getAPrimaryQlClass() { result = "RightShiftExpr" }
}
/** A binary expression using the `>>>` operator. */
class UnsignedRightShiftExpr extends BinaryExpr, @urshiftexpr {
override string getOp() { result = ">>>" }
override string getAPrimaryQlClass() { result = "UnsignedRightShiftExpr" }
}
/** A binary expression using the `&` operator. */
class AndBitwiseExpr extends BinaryExpr, @andbitexpr {
override string getOp() { result = "&" }
override string getAPrimaryQlClass() { result = "AndBitwiseExpr" }
}
/** A binary expression using the `|` operator. */
class OrBitwiseExpr extends BinaryExpr, @orbitexpr {
override string getOp() { result = "|" }
override string getAPrimaryQlClass() { result = "OrBitwiseExpr" }
}
/** A binary expression using the `^` operator. */
class XorBitwiseExpr extends BinaryExpr, @xorbitexpr {
override string getOp() { result = "^" }
override string getAPrimaryQlClass() { result = "XorBitwiseExpr" }
}
/** A binary expression using the `&&` operator. */
class AndLogicalExpr extends BinaryExpr, @andlogicalexpr {
override string getOp() { result = "&&" }
override string getAPrimaryQlClass() { result = "AndLogicalExpr" }
}
/** A binary expression using the `||` operator. */
class OrLogicalExpr extends BinaryExpr, @orlogicalexpr {
override string getOp() { result = "||" }
override string getAPrimaryQlClass() { result = "OrLogicalExpr" }
}
/** A binary expression using the `<` operator. */
class LTExpr extends BinaryExpr, @ltexpr {
override string getOp() { result = "<" }
override string getAPrimaryQlClass() { result = "LTExpr" }
}
/** A binary expression using the `>` operator. */
class GTExpr extends BinaryExpr, @gtexpr {
override string getOp() { result = ">" }
override string getAPrimaryQlClass() { result = "GTExpr" }
}
/** A binary expression using the `<=` operator. */
class LEExpr extends BinaryExpr, @leexpr {
override string getOp() { result = "<=" }
override string getAPrimaryQlClass() { result = "LEExpr" }
}
/** A binary expression using the `>=` operator. */
class GEExpr extends BinaryExpr, @geexpr {
override string getOp() { result = ">=" }
override string getAPrimaryQlClass() { result = "GEExpr" }
}
/** A binary expression using Java's `==` or Kotlin's `===` operator. */
class EQExpr extends BinaryExpr, @eqexpr {
override string getOp() { result = "==" }
override string getAPrimaryQlClass() { result = "EQExpr" }
}
/** A binary expression using the Kotlin `==` operator, semantically equivalent to `Objects.equals`. */
class ValueEQExpr extends BinaryExpr, @valueeqexpr {
override string getOp() { result = "(value equals)" }
override string getAPrimaryQlClass() { result = "ValueEQExpr" }
}
/** A binary expression using Java's `!=` or Kotlin's `!==` operator. */
class NEExpr extends BinaryExpr, @neexpr {
override string getOp() { result = "!=" }
override string getAPrimaryQlClass() { result = "NEExpr" }
}
/** A binary expression using the Kotlin `!=` operator, semantically equivalent to `Objects.equals`. */
class ValueNEExpr extends BinaryExpr, @valueneexpr {
override string getOp() { result = "(value not-equals)" }
override string getAPrimaryQlClass() { result = "ValueNEExpr" }
}
/**
* A binary expression using either Java or Kotlin's `==` operator.
*
* This might test for reference equality or might function like `Objects.equals`. If you
* need to distinguish them, use `EQExpr` or `ValueEQExpr` instead.
*/
class ValueOrReferenceEqualsExpr extends BinaryExpr {
ValueOrReferenceEqualsExpr() { this instanceof EQExpr or this instanceof ValueEQExpr }
}
/**
* A binary expression using either Java or Kotlin's `!=` operator.
*
* This might test for reference equality or might function like `Objects.equals`. If you
* need to distinguish them, use `NEExpr` or `ValueNEExpr` instead.
*/
class ValueOrReferenceNotEqualsExpr extends BinaryExpr {
ValueOrReferenceNotEqualsExpr() { this instanceof NEExpr or this instanceof ValueNEExpr }
}
/**
* A bitwise expression.
*
* This includes expressions involving the operators
* `&`, `|`, `^`, or `~`.
*/
class BitwiseExpr extends Expr {
BitwiseExpr() {
this instanceof AndBitwiseExpr or
this instanceof OrBitwiseExpr or
this instanceof XorBitwiseExpr or
this instanceof BitNotExpr
}
}
/**
* A logical expression.
*
* This includes expressions involving the operators
* `&&`, `||`, or `!`.
*/
class LogicExpr extends Expr {
LogicExpr() {
this instanceof AndLogicalExpr or
this instanceof OrLogicalExpr or
this instanceof LogNotExpr
}
/** Gets an operand of this logical expression. */
Expr getAnOperand() {
this.(BinaryExpr).getAnOperand() = result or
this.(UnaryExpr).getOperand() = result
}
}
/**
* A comparison expression.
*
* This includes expressions using the operators
* `<=`, `>=`, `<` or `>`.
*/
abstract class ComparisonExpr extends BinaryExpr {
/**
* Gets the lesser operand of this comparison expression.
*
* For example, `x` is the lesser operand
* in `x < 0`, and `0` is the
* lesser operand in `x > 0`.
*/
abstract Expr getLesserOperand();
/**
* Gets the greater operand of this comparison expression.
*
* For example, `x` is the greater operand
* in `x > 0`, and `0` is the
* greater operand in `x < 0`.
*/
abstract Expr getGreaterOperand();
/** Holds if this comparison is strict, i.e. `<` or `>`. */
predicate isStrict() { this instanceof LTExpr or this instanceof GTExpr }
}
/** A comparison expression using the operator `<` or `<=`. */
class LessThanComparison extends ComparisonExpr {
LessThanComparison() { this instanceof LTExpr or this instanceof LEExpr }
/** Gets the lesser operand of this comparison expression. */
override Expr getLesserOperand() { result = this.getLeftOperand() }
/** Gets the greater operand of this comparison expression. */
override Expr getGreaterOperand() { result = this.getRightOperand() }
}
/** A comparison expression using the operator `>` or `>=`. */
class GreaterThanComparison extends ComparisonExpr {
GreaterThanComparison() { this instanceof GTExpr or this instanceof GEExpr }
/** Gets the lesser operand of this comparison expression. */
override Expr getLesserOperand() { result = this.getRightOperand() }
/** Gets the greater operand of this comparison expression. */
override Expr getGreaterOperand() { result = this.getLeftOperand() }