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Questions - stack-frame

Why does GCC -O0 usually store the first local variable at [ebp-4], and why not always?

I am currently learning reverse engineering using the x86 Instruction Set and had the general understanding that the first local variable of a function is always stored at the address [ebp-4]. However...
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imperfect perfectionist

assembly

gcc

x86

stack-memory

stack-frame

Votes: 0

Answers: 1

Latest Answer

C is not a high-order assembly. You cannot expect the compiler to compile C to assembly statement by statement. Is the first local variable in x86 ASM always stored at location [ebp-4]? No, that wou...
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Joshua

I got a error ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1

i am learning to implement a simple Stack base machine using Linklist with c++. There are constant.h, Stackframe.h, StackFrame,cpp, main.cpp. I code on MacOs 10.14.6 with Visual Studio Code. I am gett...
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Lang Ung

c++

linker

stack-frame

Votes: 0

Answers: 1

Latest Answer

You haven't told g++ to compile and link in StackFrame.cpp. Where you have $ g++ main.cpp -o main you should have $ g++ main.cpp StackFrame.cpp -o main -lstdc++ The addition of -lstdc++ might not be...
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James McPherson

Does java create all the stack frames for recursion before printing the code for the user?

So here is a simple example of recursion where we count down from a number. When clicking run does java calculate 5,4,3,2,1,0 store those numbers in 6 stack frames only then does it print the code? Or...
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Java Learner

java

recursion

callstack

stack-frame

Votes: 0

Answers: 1

Latest Answer

Yes, you can see it for yourself using the Thread.currentThread().getStackTrace() method: import java.util.Arrays; class StackFrames { public static void main(String[] args) { countDown(5); ...
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OscarRyz

Understanding 16-byte padding and function prolog in x64 assembly

In x64 assembly, the stack frame, according to Microsoft, should be 16-byte aligned The stack will always be maintained 16-byte aligned, except within the prolog (for example, after the return addres...
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Happy Jerry

assembly

x86-64

memory-alignment

stack-memory

stack-frame

Votes: 0

Answers: 1

Latest Answer

I have been trying to figure this out myself and I believe I understand what is needed here. Assuming the CALLER of foo() ensured 16-byte alignment before the call then: The CALL statement (by the ca...
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David A

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