Imagecraft c compiler and development environment for the atmel avr

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ICCV8 for AVR – C Compiler for Atmel AVR!W (10):[warning] [MISRA 1512]suspicious array-to-pointer decay in the leftoperand of `->'An implicit array-to-pointer decay in the left operand of the -> member accessoperator is considered suspicious. For example:struct S {int i;} a[5];int f(void){return a -> i; // WARNING: the index is not specified}The warning can be suppressed by specifying the index of the dereferencing arrayelement explicitly:int f(void){return a[0].i; // OK}!W (8):[warning] [MISRA 1515]assignment used as conditional expression!W (11):[warning] [MISRA 2350]assignment in conditional expressionAssignment operators used within control expressions of the conditional and loopoperators are considiered suspicuous, e.g.:if(i = j) ... // WARNINGNote that the use of compound assignments in these contexts results in the same:if(i += j) ... // WARNINGAlso, note that the increment and decrement operators are not considered to beassignments in these contexts:if(i++) ... // OK: not an assignmentThe warning can be suppressed by surrounding the assignment expression with theparentheses:if((i = j)) ... // OK: surrounded by parentheses168
ICCV8 for AVR – C Compiler for Atmel AVR!W (10):[warning] [MISRA 3010]pointer arithmetic usedMISRA prohibits any kind of pointer arithmetic. This includes adding an integer to apointer and subtraction of an integer or pointer from another pointer, e.g.:int i;int *bar(unsigned);int *f(int *p, int *q); int *f(int *p, int *q){if(i < 33) {return 1 + p; // WARNING: pointer +integer} else {if(i < 55) {return p - 1;// WARNING: pointer- integer} else {if(i < 77) {return bar(p - q); // WARNING: pointer- pointer} else {/* do nothing */}}}}return &p[2];// OKNote that array subscription ([]) and dereferencing (*, . and ->) operators areallowed, so it is usually possible to rewrite the code that uses pointer arithmetic so thatit modifies integer indices instead of changing the pointers themselves. For example,the following functionint strlen(const char *s){int n = 0;while(*s != '\0') {s++; // WARNING}return n;}169
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Imagecraft c compiler and development environment for the atmel avr

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