Imagecraft c compiler and development environment for the atmel avr

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ICCV8 for AVR – C Compiler for Atmel AVRStatementsIn the following, if-body, while-body, ...etc. are synonymous to C statements.Expression Statement[ label: ] [expression];See Expressions and Type Promotions for discussion on expressions. An emptysemicolon by itself is a null expression statement.Compound Statement{ [statement ]* }A compound statement is a sequence of zero or more statements enclosed in a set of{}. Notably, local declarations are only valid immediately after a { and before anyexecutable statement, so sometimes a {} is introduced just for that purpose.If Statementif () if-body [ else else-body ]If evaluates to non-zero, then it executes the if-body. Otherwise, itexecutes the else-body if it exists. There is no “dangling-else” problem, as an elsekeyword is always associated with the nearest preceding if keyword.While Statementwhile () while-bodyExecutes the while-body as long as the evaluates to non-zero. Note thatour compilers compile this to something similar togoto bottomloop_top: bottom: if goto loop_topWhile not as straightforward as the obvious test-at-the-top translation, this sequenceexecutes n+2 branches for a loop that executes n times, vs. 2n+1 branches for theobvious translation.For Statementfor ( [] ; ; ) for-body82
ICCV8 for AVR – C Compiler for Atmel AVRExecutes the for-body as long as evaluates to non-zero. isexecuted after the for-body. and are places where you usuallywould put initial expressions and loop increments respectively.Do Statementdo do-body while ();Executes do-body at least once and, if evaluates to non-zero, repeat theprocess.Break Statementbreak;Valid only inside a loop body or inside a switch statement. It causes control to falloutside of the loop or the switch. Inside a switch, execution falls through to the nextcase, unless it is terminated by a break statement.Continue Statementcontinue;Valid only inside a loop body. It causes control to go to the loop test. Inside a forstatement, it will skip the third expression normally executed.Goto Statementgoto label;Transfer control flow to label. There is no restriction on where label is located aslong as it is a valid label inside the same function. In other words, while usually not agood idea, it is acceptable to jump into the middle of a loop or other “bad” places.Return Statementreturn [];Transfer control flow back to the calling function and optionally return the value of thespecified expression.Switch Statementswitch () switch-body83
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TOOL REFERENCESMISRA / Lint Code Ch
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