181 lines
5.5 KiB
TypeScript
181 lines
5.5 KiB
TypeScript
import { INDENT, POINTER_SIZE, assertSize, toHex } from './common';
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import { Method } from './method';
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import { Property } from './property';
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export class VTable implements Property {
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readonly #name: string;
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#address: number | null;
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#size: number | null;
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readonly #methods: Method[];
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// Constructor
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constructor(name: string) {
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this.#name = name;
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this.#address = null;
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this.#size = null;
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this.#methods = [];
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}
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// Property Information
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propertyOffset() {
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return 0;
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}
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propertySize() {
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return POINTER_SIZE;
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}
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propertyType() {
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return this.#getName() + ' *';
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}
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propertyName() {
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return 'vtable';
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}
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propertyAlignment() {
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return 4;
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}
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// Setters
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setAddress(address: number) {
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this.#address = address;
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}
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setSize(size: number) {
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this.#size = size;
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if ((this.#size % POINTER_SIZE) !== 0) {
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throw new Error(`Invalid VTable Size: ${this.#size}`);
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}
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}
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// Add To VTable
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add(method: Method) {
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// Check Offset
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const offset = method.address;
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if ((offset % POINTER_SIZE) !== 0) {
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throw new Error(`Invalid VTable Offset: ${offset}`);
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}
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// Check Size
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if (this.#size !== null && (offset + POINTER_SIZE) > this.#size) {
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throw new Error(`VTable Offset Too Large: ${offset}`);
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}
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// Add
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const index = offset / POINTER_SIZE;
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this.#methods[index] = method;
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}
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// Get Structure Name
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#getName() {
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return this.#name + '_vtable';
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}
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// Check
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#check() {
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// Check Size
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if (this.#size !== null) {
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const maxMethodCount = this.#size / POINTER_SIZE;
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if (maxMethodCount < this.#methods.length) {
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throw new Error(`VTable Size Too Small: ${this.#size}`);
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}
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this.#methods.length = maxMethodCount;
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}
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}
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// Generate Code
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generate() {
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let out = '';
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// Check
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this.#check();
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// Method Prototypes
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for (let i = 0; i < this.#methods.length; i++) {
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const info = this.#methods[i];
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if (info) {
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out += info.generateTypedef();
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}
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}
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// Structure
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out += `typedef struct ${this.#getName()} ${this.#getName()};\n`;
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out += `struct ${this.#getName()} {\n`;
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for (let i = 0; i < this.#methods.length; i++) {
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let name = `unknown${i}`;
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let type = 'void *';
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const info = this.#methods[i];
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if (info) {
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name = info.shortName;
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type = info.getType() + ' ';
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}
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out += `${INDENT}${type}${name};\n`;
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}
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out += `};\n`;
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// Sanity Check Size
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const isSizeDefined = this.#size !== null;
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const size = isSizeDefined ? this.#size! : (this.#methods.length * POINTER_SIZE);
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out += assertSize(this.#getName(), size, isSizeDefined);
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// Pointers
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if (this.#address !== null) {
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// Base
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out += `extern ${this.#getName()} *${this.#getName()}_base;\n`;
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// Methods
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for (let i = 0; i < this.#methods.length; i++) {
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const info = this.#methods[i];
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if (info) {
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const type = `${info.getType()} *`;
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out += `extern ${type}${info.getName()}_vtable_addr;\n`;
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out += `extern ${info.generateDefinition('_non_virtual')}`;
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}
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}
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}
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// Duplication Method
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if (isSizeDefined) {
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out += `${this.#getName()} *dup_${this.#getName()}(${this.#getName()} *vtable);\n`;
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}
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// Return
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return out;
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}
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// Generate Compiled Code
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generateCode() {
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let declarations = '';
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let init = '';
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// Check
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this.#check();
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// Pointers
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if (this.#address !== null) {
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// Base
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init += `${INDENT}${this.#getName()}_base = (${this.#getName()} *) ${toHex(this.#address)};\n`;
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declarations += `${this.#getName()} *${this.#getName()}_base;\n`;
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// Methods
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for (let i = 0; i < this.#methods.length; i++) {
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const info = this.#methods[i];
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if (info) {
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const vtableAddress = this.#address + (i * POINTER_SIZE);
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const type = `${info.getType()} *`;
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init += `${INDENT}${info.getName()}_vtable_addr = (${type}) ${toHex(vtableAddress)};\n`;
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declarations += `${type}${info.getName()}_vtable_addr;\n`;
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init += `${INDENT}${info.getName()}_non_virtual = *${info.getName()}_vtable_addr;\n`;
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declarations += info.generateDefinition();
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}
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}
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}
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// Duplication Method
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if (this.#size !== null) {
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declarations += `${this.#getName()} *dup_${this.#getName()}(${this.#getName()} *vtable) {\n`;
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declarations += `${INDENT}${this.#getName()} *obj = new ${this.#getName()};\n`;
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declarations += `${INDENT}if (obj == NULL) {\n`;
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declarations += `${INDENT}${INDENT}return NULL;\n`;
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declarations += `${INDENT}}\n`;
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declarations += `${INDENT}memcpy((void *) obj, (void *) vtable, sizeof (${this.#getName()});\n`;
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declarations += `${INDENT}return obj;\n`;
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declarations += '}\n';
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}
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// Return
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return {declarations, init};
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}
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} |