The memory allocator finds an empty spot in the heap that is big enough, marks it as being in use, and returns a pointer, which is the address of that location. This process is called allocating on the heap and is sometimes abbreviated as just allocating. Pushing values onto the stack ...
D9 F6Decrement TOP field in FPU status word. Description¶ Subtracts one from the TOP field of the FPU status word (decrements the top-of-stack pointer). If the TOP field contains a 0, it is set to 7. The effect of this instruction is to rotate the stack by one position. The ...
%rsp是栈顶指针寄存器,其值永远指向 stack 的顶部。%rbp大家可能会陌生一点,x86_64 代码使用该寄存器作为帧指针(frame pointer),有时也称为基指针(base pointer),这也是 %rbp 中bp两个字母的由来。看如下代码: longswap_add(long*xp,long*yp){longx=*xp;longy=*yp;*xp=y;*yp=x;returnx+y;}longcaller...
D9 F7 Increment the TOP field in the FPU status register. Description ¶ Adds one to the TOP field of the FPU status word (increments the top-of-stack pointer). If the TOP field contains a 7, it is set to 0. The effect of this instruction is to rotate the stack by one position...
D9 F7 FINCSTP Valid Valid Increment the TOP field in the FPU status register. Description ¶ Adds one to the TOP field of the FPU status word (increments the top-of-stack pointer). If the TOP field contains a 7, it is set to 0. The effect of this instruction is to rotate the ...
stack overflow– buffer has been overflowed in the stack space. the data flows from one buffer space into another, causing the return address instruction pointer to be overwritten. heap overflow– a heap overflows does not necessarily overflow but corrupts the heap memory space (buffer), overwriti...
相比之下,那时候最喜欢 Java,在 Java 里随便怎么写都不会发生类似的异常,顶多偶尔来个NullPointerException,也是比较好排查的。 直到后来对内存和指针有了更加深刻的认识,才慢慢会用 C 写上千行的项目,也很少会再有内存问题了。(过于自信 「指针存储的是变量的内存地址」这句话应该任何讲 C 语言的书都会提到吧...
Level 4: All broadcast and reduction functions that are not in previous level [x] pow [x] less [x] greater [x] less_than [x] greater_than [x] right_shift [x] left_shift [x] maximum [x] minimum [x] sum [x] max [x] prod ...
Stack-address size. Outside of 64-bit mode, the B flag in the current stack-segment descriptor determines the size of the stack pointer (16 or 32 bits); in 64-bit mode, the size of the stack pointer is always 64 bits.The stack-address size determines the width of the stack pointer ...
First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn- Capabilities: [160 v1] Alternative Routing-ID Interpretation (ARI) ARICap: MFVC- ACS-, Next Function: 0 ARICtl: MFVC- ACS-, Function Group: 0 Capabilities: [200 v1] Single Root I/O Virtualization (SR-I...