felipepiovezan wrote:
Sorry for the delay, long weekend here in the US.
Ok, I think I finally got it working, mostly? I was facing two issues: 1) `v`
gets confused by what we were doing, but `expr` doesn't; 2) Older versions of
LLDB would fail to find the symbol -- even with expr -- after `target symbol
add...`
So I have this:
```
{
"triple": "arm64e-apple-macosx13.0.0",
"uuid": "C8576DD6-9D22-48ED-9890-FB216DEE329F",
"type": "executable",
"sections": [
{
"name": "__DATA",
"type": "data",
"address": 1297224342667202580,
"size": 16
}
],
"symbols": [
{
"name": "myglobal_json",
"size": 8,
"type": "data",
"address": 1297224342667202580
}
]
}
```
And this main.c:
```
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
int myglobal = 0;
uint64_t get_high_bits(void *ptr) {
uint64_t mask = ~((1ULL << 48) - 1);
uint64_t ptrtoint = (uint64_t)ptr;
uint64_t high_bits = ptrtoint & mask;
printf("Higher bits are = %llx\n", high_bits);
return high_bits;
}
int main (){
int x = 42;
assert(0 == get_high_bits(&x));
assert(0 == get_high_bits(&myglobal));
return 0; //breakhere
}
```
The contents of main are irrelevant here, more of a sanity check (the second
assert should fail on an arm64e target).
So we load the json file, add the new symbol (I opted for a new symbol instead
of overwriting the existing one), and run it through the expression evaluator.
WITHOUT this patch, this is what we get:
```
(lldb) target module add test.json
(lldb) expr &myglobal_json
(void **) $2 = 0x1200aaaaaaab1014
(lldb) expr get_high_bits(&myglobal_json)
Higher bits are = 1200000000000000
(uint64_t) $3 = 1297036692682702848
```
WITH this patch:
```
(lldb) target module add test.json
(lldb) expr &myglobal_json
(void **) $2 = 0x00002aaaaaab1014
(lldb) expr get_high_bits(&myglobal_json)
Higher bits are = 0
(uint64_t) $3 = 0
```
This looks like what we expect, right? If so, I will go ahead and try to make
this into an API test!
https://github.com/llvm/llvm-project/pull/153585
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