## Educational Content on Assembly and C Code Integration### OverviewThis example demonstrates a program whose code is divided into two source files: `lib1.c` and `test1.c`. The task is to examine the assembly code and complete the missing parts of the C code.### Assembly Code Analysis#### File: `lib1.s`1. **Function `ne2`:** - Compares the value at `%edi` with `2`. - Sets `%al` to the result of the comparison. - Moves the result to `%eax`. - Returns from the function.2. **Function `check`:** - Compares the value at `%edi` with `1`. - Jumps to label `.L4` if equal. - Calls the `ne2` function. - Tests `%eax`. - Jumps to label `.L2` if zero. - Moves `1` to `%eax`. - Returns from the function.#### File: `test1.s`1. **Function `find`:** - Initializes stack and registers. - Copies argument to `%r12`. - Compares `%ebp` with `2`. - Jumps to label `.L7` if greater. - Copies and scales values to `%rbx`. - Calls the `check` function. - Tests `%eax`. - Updates loop index and checks conditions. - Jumps to labels `.L2`, `.L8`, and `.L1` based on conditions.### Corresponding C Code#### File: `lib1.c````cstatic int x = 1;int error;static int ne2(int c) { return c _____ ; // Complete based on assembly comparison}int check(int c) { return (c ____ x) ____ ne2(c); // Logic derived from comparison and assembly flow}```#### File: `test1.c````cextern int error;int check(int c);struct item { _____ x; // Data type or field name based on assembly operations int y;};long find(struct item *a) { for (int i = 0; _______ ; i++) { // Loop condition derived from assembly index checks if (______________________) { // Condition matching assembly test return _________; // Return based on conditions checked

===== lib1.s ========== ne2: cmpl $2, %edisetne %almovzbl %al, %eaxretqcheck: cmpl $1, %edije .L4callq ne2testl %eax, %eaxje .L2movl $1, %eaxretq.L4: movl $0, %eax.L2: retq ========= lib1.c ========= static int x = 1;int error;static int ne2(int c) {return c != 2 ;}int check(int c) {return (c != x) && ne2(c);}========= test1.s =========find: pushq %r12pushq %rbppushq %rbxmovq %rdi, %r12movl $0, %ebp.L2: cmpl $2, %ebpjg .L7movslq %ebp, %rbxsalq $4, %rbxaddq %r12, %rbxmovl 8(%rbx), %edicall checktestl %eax, %eaxjne .L8addl $1, %ebpjmp .L2.L8: movq (%rbx), %raxjmp .L1.L7: movl $0, %eax.L1: popq %rbxpopq %rbppopq %r12ret ========= ========= test1.c ========= extern int error;int check(int c);struct item {long x;int y;};long find(struct item *a) {for (int i = 0; i < 3 ; i++) {if ( check(a[i].y) ) {return a[i].x ;}}return 0;}

Answered: A program's code is split among two…

Engineering

Computer Science

A program's code is split among two source files lib1.c and test1.c. Examine the assembly code and fill in the blanks of the C code. = lib1.s lib1.c

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Module Hierarchy Chart

The hierarchy chart is a graphical representation that is used to represent the relationship between various modules or systems in an organization. In programming, a hierarchy chart is used for representing an organizational framework. The hierarchy charts can also be utilized to show an organization’s reporting structure. In such a hierarchy chart, the President is at the top, the Vice Presidents are on the next level which is lower than its predecessor, and so forth.

Question

## Educational Content on Assembly and C Code Integration

### Overview

This example demonstrates a program whose code is divided into two source files: `lib1.c` and `test1.c`. The task is to examine the assembly code and complete the missing parts of the C code.

### Assembly Code Analysis

#### File: `lib1.s`

1. **Function `ne2`:**
- Compares the value at `%edi` with `2`.
- Sets `%al` to the result of the comparison.
- Moves the result to `%eax`.
- Returns from the function.

2. **Function `check`:**
- Compares the value at `%edi` with `1`.
- Jumps to label `.L4` if equal.
- Calls the `ne2` function.
- Tests `%eax`.
- Jumps to label `.L2` if zero.
- Moves `1` to `%eax`.
- Returns from the function.

#### File: `test1.s`

1. **Function `find`:**
- Initializes stack and registers.
- Copies argument to `%r12`.
- Compares `%ebp` with `2`.
- Jumps to label `.L7` if greater.
- Copies and scales values to `%rbx`.
- Calls the `check` function.
- Tests `%eax`.
- Updates loop index and checks conditions.
- Jumps to labels `.L2`, `.L8`, and `.L1` based on conditions.

### Corresponding C Code

#### File: `lib1.c`

```c
static int x = 1;
int error;

static int ne2(int c) {
return c _____ ; // Complete based on assembly comparison
}

int check(int c) {
return (c ____ x) ____ ne2(c); // Logic derived from comparison and assembly flow
}
```

#### File: `test1.c`

```c
extern int error;
int check(int c);

struct item {
_____ x; // Data type or field name based on assembly operations
int y;
};

long find(struct item *a) {
for (int i = 0; _______ ; i++) { // Loop condition derived from assembly index checks
if (______________________) { // Condition matching assembly test
return _________; // Return based on conditions checked

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