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acc [2017/06/13 14:57]
korshun created
acc [2017/07/14 22:23] (current)
korshun
Line 1: Line 1:
 +{{tag>acs_compilers}}
 ====== ACC ====== ====== ACC ======
 ACC is the official ACS compiler. ACC is the official ACS compiler.
 +
 +Alternative ACS compilers: [[BCC]], [[GDCC]].
 +
 +  * **GitHub**: https://github.com/rheit/acc/
 +
 +===== Known bugs =====
 +
 +==== 256 function limit ====
 +
 +ACSUtils has a lot more than 256 functions, but official releases of ACC can't compile programs with more than 256 functions.
 +
 +To fix this, download the April 26, 2017 development version of ACC (unofficial build for Windows): http://acsutils.strangled.net/lib/exe/fetch.php?media=acc-1.56-beta-g3256a3e.zip
 +
 +==== Mixing strings and numbers in an array corrupts the numbers ====
 +
 +<code>
 +int SomeArray[] = {
 +    1,
 +    3.14159,
 +    "string"
 +}
 +</code>
 +
 +Can result in 1 and 3.14159 getting corrupted.
 +
 +ACC incorrectly writes initial array values, resulting in some numbers getting interpreted as string indices and recalculated to avoid string index conflicts between libraries.
 +
 +This bug only affects non-local arrays and happens randomly, usually only with large arrays.
 +
 +To avoid this bug, **do not use static initialization with non-local arrays, this includes multidimensional arrays**, instead, declare an empty array and initialize it in a function:
 +
 +<code>
 +int SomeArray[3];
 +
 +function void InitArrays()
 +{
 +    int i = 0;
 +    SomeArray[i++] = 1;
 +    SomeArray[i++] = 3.14159;
 +    SomeArray[i++] = "string";
 +}
 +</code>
 +
 +Or, in a more beautiful way:
 +
 +<code>
 +int SomeArray[3];
 +int SomeArrayCount = 0;
 +
 +function void AddEntry(int x)
 +{
 +    SomeArray[SomeArrayCount++] = x;
 +}
 +
 +function void InitArray(void)
 +{
 +    AddEntry(1);
 +    AddEntry(3.14159);
 +    AddEntry("string");
 +}
 +</code>
 +
 +==== Strange compiler crash (ACC 1.56 beta Windows build only) ====
 +
 +<code>
 +#include "zcommon.acs"
 +
 +function int f(void)
 +{
 +    while (0)
 +        continue;
 +    return 0;
 +}
 +
 +function int g(void)
 +{
 +    while (0)
 +        continue;
 +    return 0;
 +}
 +</code>
 +
 +This code causes the compiler to enter an infinite loop. Any of the following fixes the issue:
 +
 +  * Removing one of the functions
 +  * Removing ''return 0;'' in one of the functions (causes compiler error, as expected)
 +  * Replacing ''continue;'' with ''break;'' in one of the functions
 +
 +But the following does not:
 +  * Changing the loop condition
 +  * Replacing ''int'' with ''void''
 +  * Adding more code before and after continue, both inside and outside the loop
 +  * Adding more functions anywhere else
 +  * Replacing "while" loop with "for"
 +
 +==== Local variable names can conflict with global names ====
 +
 +<code>
 +#define SOMENAME1 1
 +int somename2 = 2;
 +function void somename3(void) {}
 +
 +function f(int somename1) // ERROR
 +{
 +    int somename2; // ERROR
 +    int somename3; // ERROR
 +}
 +</code>
 +
 +Local variables can't have the same names as any global names (function, constant, variable names). Unlike other compilers, local variable names don't shadow the global names, but trigger a compiler error.
 +
 +==== No "fixed" type ====
 +
 +There is no type called ''fixed'' in ACC. Only ''int'', ''bool'' and ''str''.
 +
acc.1497355073.txt.gz ยท Last modified: 2017/06/13 14:57 by korshun