inline-assembly

Related to my other question , please help me debug "An unhandled exception of type 'System.AccessViolationException' occurred in Unknown Module. Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Stepping through the code, everything works up until the actual call to del() and fails in that line. This code is based on this article's sample and this python code which works in python. I can't get the code example as-is to work either (same exception), but I'm hopeful that it's just a little outdated or something. EDIT:

I always thought that functions like printf() are, in the last step, defined using inline assembly. That deep in the bowels of stdio.h is buried some asm code that actually tells CPU what to do. For example, in dos, I remember it was implemented by first mov ing the beginning of the string to some memory location or register and than calling an int terupt. However, since the x64 version of Visual Studio doesn't support inline assembler at all, it made me wonder how there could be no assembler-defined functions at all in C/C++. How does a library function like printf() get implemented in C/C++

I'm trying to output the same string twice in extended inline ASM in GCC , on 64-bit Linux. int main() { const char* test = "test\n"; asm( "movq %[test], %%rdi\n" // Debugger shows rdi = *address of string* "movq $0, %%rax\n" "push %%rbp\n" "push %%rbx\n" "call printf\n" "pop %%rbx\n" "pop %%rbp\n" "movq %[test], %%rdi\n" // Debugger shows rdi = 0 "movq $0, %%rax\n" "push %%rbp\n" "push %%rbx\n" "call printf\n" "pop %%rbx\n" "pop %%rbp\n" : : [test] "g" (test) : "rax", "rbx","rcx", "rdx", "rdi", "rsi", "rsp" ); return 0; } Now, the string is outputted only once. I have tried many things, but I

In my ongoing experimentation with GCC inline assembly, I've run into a new problem regarding labels and inlined code. Consider the following simple jump: __asm__ ( "jmp out;" "out:;" : : ); This does nothing except jump to the out label. As is, this code compiles fine. But if you place it inside a function, and then compile with optimization flags, the compiler complains: "Error: symbol 'out' is already defined". What seems to be happening is that the compiler is repeating this assembly code every time it inlines the function. This causes the label out to get duplicated, leading to multiple

The compare function is a function that takes two arguments a and b and returns an integer describing their order. If a is smaller than b , the result is some negative integer. If a is bigger than b , the result is some positive integer. Otherwise, a and b are equal, and the result is zero. This function is often used to parametrize sorting and searching algorithms from standard libraries. Implementing the compare function for characters is quite easy; you simply subtract the arguments: int compare_char(char a, char b) { return a - b; } This works because the difference between two characters