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dmd.optimize

Perform constant folding.

Authors:

Walter Bright

License:

Boost License 1.0

Source optimize.d

Documentation https://dlang.org/phobos/dmd_optimize.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/optimize.d

Expression expandVar(int result, VarDeclaration v);

If variable has a const initializer, return that initializer.

Returns:

initializer if there is one, null if not, ErrorExp if error

package void setLengthVarIfKnown(VarDeclaration lengthVar, Expression arr);

It is possible for constant folding to change an array expression of unknown length, into one where the length is known. If the expression 'arr' is a literal, set lengthVar to be its length.

Parameters:

VarDeclaration `lengthVar`	variable declaration for the .length property
Expression `arr`	String, ArrayLiteral, or of TypeSArray

package void setLengthVarIfKnown(VarDeclaration lengthVar, Type type);

Same as above, but determines the length from 'type'.

Parameters:

VarDeclaration `lengthVar`	variable declaration for the .length property
Type `type`	TypeSArray

Expression optimize(Expression e, int result, bool keepLvalue = false);

Constant fold an Expression.

Parameters:

Expression `e`	expression to const fold; this may get modified in-place
int `result`	WANTvalue, WANTexpand, or both
bool `keepLvalue`	`e` is an lvalue, and keep it as an lvalue since it is an argument to a ref or out parameter, or the operand of & operator

Returns:

Constant folded version of e

Library Reference

dmd.optimize