http://llvm.org/bugs/show_bug.cgi?id=19321
Bug ID: 19321
Summary: __attribute__((cleanup)) does not respect __block
qualifier
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following simple test program:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Block.h>
typedef int (^block_t)(void);
static void freestr(char **s)
{
if (s)
{
printf("Freeing block: %s\n", *s);
free(*s);
*s = 0;
}
}
block_t getCounter(char *name)
{
__attribute__((cleanup(freestr)))
__block char *n = strdup(name);
__block int c=0;
return Block_copy(^()
{
printf("%s called %d times\n", n, ++c);
return c;
});
}
int main(void)
{
block_t counter = getCounter("A counter");
counter();
counter();
counter();
counter();
Block_release(counter);
return 0;
}
When run, produces:
Freeing block: A counter
(null) called 1 times
(null) called 2 times
(null) called 3 times
(null) called 4 times
The lifetime of the bound variable is the lifetime of the block, but the
cleanup code runs sooner. The analogous C++ example (an object with a
destructor) runs correctly.
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