Page History

unreachable-code

statement-sideeffect

DIAG.UNEX.*
LANG.STRUCT.EBS
LANG.STRUCT.RC
MISC.NOEFFECT
LANG.STRUCT.UC
LANG.STRUCT.UA
LANG.STRUCT.UULABEL
LANG.STRUCT.UUMACRO
LANG.STRUCT.UUPARAM
LANG.STRUCT.UUTAG
LANG.STRUCT.UUTYPE

Code not exercised by analysis
Empty branch statement checks
Redundant condition
Function call has no effect
Unreachable code checks
Useless assignment
Unused Label
Unused Macro
Unused Parameter
Unused Tag
Unused Type

Coverity

NO_EFFECT

DEADCODE

UNREACHABLE

Finds statements or expressions that do not accomplish anything or statements that perform an unintended action.

Can detect the specific instance where code can never be reached because of a logical contradiction or a dead "default" in switch statement

Can detect the instances where code block is unreachable because of the syntactic structure of the code

ECLAIR

CC2.MSC12

Partially implemented

3.0

-Wunused-value
-Wunused-parameter


Options detect unused local variables, nonconstant static variables and unused function parameters, or unreachable code respectively.

C3110, C3112, C3307, C3404, C3426, C3427

CWARN.NOEFFECT.SELF_ASSIGN
CWARN.NOEFFECT.UCMP.GE
CWARN.NOEFFECT.UCMP.GE.MACRO
CWARN.NOEFFECT.UCMP.LT
CWARN.NOEFFECT.UCMP.LT.MACRO
CWARN.NULLCHECK.FUNCNAME
EFFECT
INVARIANT_CONDITION.UNREACH
LA_UNUSED
MISRA.STMT.NO_EFFECT
UNREACH.GEN
UNREACH.RETURN
UNREACH.SIZEOF
VA_UNUSED.GEN
VA_UNUSED.INIT

Partially implemented

CERT_C-MSC12-a
CERT_C-MSC12-b
CERT_C-MSC12-c
CERT_C-MSC12-d
CERT_C-MSC12-e
CERT_C-MSC12-f
CERT_C-MSC12-g
CERT_C-MSC12-h

There shall be no unreachable code in "else" block
There shall be no unreachable code after 'return', 'break', 'continue', and 'goto' statements
There shall be no unreachable code in "if/else/while/for" block
There shall be no unreachable code in switch statement
There shall be no unreachable code in 'for' loop
There shall be no unreachable code after 'if' or 'switch' statement
There shall be no unreachable code after "if" or "switch" statement inside while/for/do...while loop
Avoid switch with unreachable branches

438, 474, 505, 522, 523,
527, 528, 529, 563, 612,
714, 715, 719, 749, 750,
751, 752, 753, 754, 755,
756, 757, 758, 768, 769,
774, 827, 838, 1972

Fully supported

CERT C: Rec. MSC12-C

Checks for:

• Unreachable code
• Dead code

Rec. partially covered.

3110, 3112, 3307, 3404, 3426, 3427

statement-sideeffect

 -standard

The default mode checks for unreachable code.

PVS-Studio