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Try-catch speeding up my code?
...le stores and the way the JIT compiler does register scheduling in the corresponding x86 code. The result is suboptimal code generation on the loads and stores of the locals.
For some reason unclear to all of us, the problematic code generation path is avoided when the JITter knows that the block i...
Difference between passing array and array pointer into function in C
... type derivation, then for each call to the function, the value of the corresponding
actual argument shall provide access to the first element of an array with at least as many
elements as specified by the size expression.
So, in short, any function parameter declared as T a[] or T a[N] is treated...
How does this milw0rm heap spraying exploit work?
...EA8331FC0B6A6A jmp 0x6a6a:0xbfc3183
00000017 03D4 add edx,esp
00000019 07 pop es
0000001A 67305CFF xor [si-0x1],bl
0000001E 98 cwde
0000001F BBD7FFA4FE mov ebx,0xfea4ffd7
00000024 9B wait
00000025 74AD j...
Is volatile expensive?
...R-133 Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are eff...
GDB corrupted stack frame - How to debug?
...ff the stack. In 32-bit x86 code you just do:
(gdb) set $pc = *(void **)$esp
(gdb) set $esp = $esp + 4
With 64-bit x86 code you need
(gdb) set $pc = *(void **)$rsp
(gdb) set $rsp = $rsp + 8
Then, you should be able to do a bt and figure out where the code really is.
The other 1% of the time,...
Do sealed classes really offer performance Benefits?
... = new NormalClass();
00000000 push ebp
00000001 mov ebp,esp
00000003 sub esp,8
00000006 cmp dword ptr ds:[00585314h],0
0000000d je 00000014
0000000f call 70032C33
00000014 xor edx,edx
00000016 mov dword ptr [ebp-4],edx
0...
How can one see content of stack with GDB?
...o
To read the memory at given addresses you should take a look at x
x/x $esp for hex x/d $esp for signed x/u $esp for unsigned etc. x uses the format syntax, you could also take a look at the current instruction via x/i $eip etc.
...
String literals: Where do they go?
...rt literals, I could see the compiler generating code such as movb $65, 8(%esp); movb $66, 9(%esp); movb $0, 10(%esp) for the string "AB", but the vast majority of the time, it will be in a non-code segment such as .data or .rodata or the like (depending on whether or not the target supports read-on...
Is errno thread-safe?
...0: 55 push ebp
1: 89 e5 mov ebp,esp
3: 83 e4 f0 and esp,0xfffffff0
6: e8 fc ff ff ff call 7 <main+0x7> ; get address of errno in EAX
b: c7 00 00 00 00 00 mov DWORD PTR [eax],0x0 ; store 0 in errno
11: b8 00...
BLE通信数据不能超过20字节？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...没问题，用AI2就截断了，只有20字符。
答复：
1-在 ESP32 代码中，我放置了这一行：BLEDevice::setMTU(192);
2- 在应用程序中，我将调用 Request MTU 放在 .Connected 块上，请求相同的 192 字节；
就我而言，当我必须发送< 23字节的...