Implement sizeof() function #1269
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danobi
commented
Apr 16, 2020
| @@ -9,6 +9,7 @@ | |||
| import re | |||
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| BPF_PATH = environ["BPFTRACE_RUNTIME_TEST_EXECUTABLE"] | |||
| ENV_PATH = environ["PATH"] | |||
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This is stolen from #1268 . Whichever PR goes in second I'll take it out from.
|
cc @olsajiri for the BTF fix |
It's often useful to know the size of a struct. As a bonus, this
implementation also works with expressions. eg:
struct Foo
{
int x;
}
BEGIN
{
printf("%d\n", sizeof(struct Foo));
printf("%d\n", sizeof(1 == 1));
printf("%d\n", sizeof(((struct Foo)0).x));
}
Before, identifiers weren't being pulled in. eg if you used an enum like
this:
printf("%d\n", SOME_KERNEL_ENUM);
This commit correctly pulls in the identifier. So sizeof can work
correctly.
fbs
approved these changes
Apr 17, 2020
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It's often useful to know the size of a struct. As a bonus, this
implementation also works with all other known types and
expressions. eg:
This closes #73 .