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expr_initializer.cpp File Reference

Expression Initialization. More...

#include "expr_initializer.h"
#include "arith_tools.h"
#include "bitvector_expr.h"
#include "byte_operators.h"
#include "c_types.h"
#include "config.h"
#include "magic.h"
#include "namespace.h"
#include "simplify_expr.h"
#include "std_code.h"
#include "symbol_table.h"

+ Include dependency graph for expr_initializer.cpp:

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Classes

class expr_initializert

Functions

std::optional< exprt > zero_initializer (const typet &type, const source_locationt &source_location, const namespacet &ns)

Create the equivalent of zero for type type.

std::optional< exprt > nondet_initializer (const typet &type, const source_locationt &source_location, const namespacet &ns)

Create a non-deterministic value for type type, with all subtypes independently expanded as non-deterministic values.

std::optional< exprt > expr_initializer (const typet &type, const source_locationt &source_location, const namespacet &ns, const exprt &init_byte_expr)

Create a value for type type, with all subtype bytes initialized to the given value.

static exprt cast_or_reinterpret (const exprt &expr, const typet &out_type)

Typecast the input to the output if this is a signed/unsigned bv.

exprt duplicate_per_byte (const exprt &init_byte_expr, const typet &output_type, const namespacet &ns)

Builds an expression of the given output type with each of its bytes initialized to the given initialization expression.

Detailed Description

Expression Initialization.

Definition in file expr_initializer.cpp.

Function Documentation

◆ cast_or_reinterpret()

static exprt cast_or_reinterpret ( const exprt & expr,

const typet & out_type

)

static

Typecast the input to the output if this is a signed/unsigned bv.

Perform a reinterpret cast using byte_extract otherwise.

Parameters: expr the expression to be casted if necessary.

out_type the type to cast the expression to.

Returns: the casted or reinterpreted expression.

Definition at line 354 of file expr_initializer.cpp.

◆ duplicate_per_byte()

exprt duplicate_per_byte ( const exprt & init_byte_expr,

const typet & output_type,

const namespacet & ns

)

Builds an expression of the given output type with each of its bytes initialized to the given initialization expression.

Integer bitvector types are currently supported. For unsupported output_type the initialization expression is casted to the output type.

Parameters: init_byte_expr The initialization expression

output_type The output type

ns Namespace to perform type symbol/tag lookups

Returns: The built expression

Note: init_byte_expr must be a boolean or a bitvector and must be of at most size <= config.ansi_c.char_width

Definition at line 381 of file expr_initializer.cpp.

◆ expr_initializer()

std::optional< exprt > expr_initializer ( const typet & type,

const source_locationt & source_location,

const namespacet & ns,

const exprt & init_byte_expr

)

Create a value for type type, with all subtype bytes initialized to the given value.

Parameters: type Type of the target expression.

source_location Location to record in all created sub-expressions.

ns Namespace to perform type symbol/tag lookups.

init_byte_expr Value to be used for initialization.

Returns: An expression if a byte-initialized expression of the input type can be built.

Definition at line 340 of file expr_initializer.cpp.

◆ nondet_initializer()

std::optional< exprt > nondet_initializer ( const typet & type,

const source_locationt & source_location,

const namespacet & ns

)

Create a non-deterministic value for type type, with all subtypes independently expanded as non-deterministic values.

Parameters: type Type of the target expression.

source_location Location to record in all created sub-expressions.

ns Namespace to perform type symbol/tag lookups.

Returns: An expression if a non-deterministic expression of the input type can be built.

Definition at line 324 of file expr_initializer.cpp.

◆ zero_initializer()

std::optional< exprt > zero_initializer ( const typet & type,

const source_locationt & source_location,

const namespacet & ns

)

Create the equivalent of zero for type type.

Parameters: type Type of the target expression.

source_location Location to record in all created sub-expressions.

ns Namespace to perform type symbol/tag lookups.

Returns: An expression if a constant expression of the input type can be built.

Definition at line 308 of file expr_initializer.cpp.