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nora 2025-01-12 17:07:01 +01:00
parent dc6217d1b6
commit ee5fcc2e24
1 changed files with 45 additions and 28 deletions
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73
index.js
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@ -792,9 +792,30 @@ function lower(ast) {
} }
class BufferBuilder { class BufferBuilder {
#buffer #buffer;
constructor() { constructor() {
this.#buffer = new ArrayBuffer(0, {maxByteLength: 2**32}); this.#buffer = new ArrayBuffer(0, { maxByteLength: 2 ** 32 });
}
#appendUintGeneric(size, name, int) {
assertDefined(int);
assert(typeof int === "number" || typeof int === "bigint");
const oldLength = this.length;
this.#buffer.resize(oldLength + size);
new DataView(this.#buffer)[name](oldLength, int, BUFFER_LE);
}
appendUint8(int) {
this.#appendUintGeneric(1, "setUint8", int);
}
appendUint16Le(int) {
this.#appendUintGeneric(2, "setUint16", int);
}
appendUint32Le(int) {
this.#appendUintGeneric(4, "setUint32", int);
}
appendUint64Le(int) {
assert(typeof int === "number");
this.#appendUintGeneric(8, "setBigUint64", BigInt(int));
} }
append(array) { append(array) {
assertDefined(array); assertDefined(array);
@ -815,9 +836,11 @@ function lower(ast) {
return this.length; return this.length;
} }
writeUint16Le(offset, int) { writeUint16Le(offset, int) {
assertDefined(offset, int);
new DataView(this.#buffer).setUint16(offset, int, BUFFER_LE); new DataView(this.#buffer).setUint16(offset, int, BUFFER_LE);
} }
writeUint32Le(offset, int) { writeUint32Le(offset, int) {
assertDefined(offset, int);
new DataView(this.#buffer).setUint32(offset, int, BUFFER_LE); new DataView(this.#buffer).setUint32(offset, int, BUFFER_LE);
} }
toUint8Array() { toUint8Array() {
@ -975,21 +998,17 @@ function lower(ast) {
const writeSectionHeader = (name, sh) => { const writeSectionHeader = (name, sh) => {
sectionCount++; sectionCount++;
const nameIndex = shstrs.pushAndGet(name); const nameIndex = shstrs.pushAndGet(name);
out.append([ out.appendUint32Le(nameIndex);
...littleEndian32(nameIndex), out.appendUint32Le(sh.type);
...littleEndian32(sh.type), out.appendUint64Le(sh.flags);
...littleEndian64(sh.flags), out.appendUint64Le(sh.addr);
...littleEndian64(sh.addr),
]);
sectionOffsetRefs[name] = out.currentPos; sectionOffsetRefs[name] = out.currentPos;
out.append([ out.appendUint64Le(sh.offset);
...littleEndian64(sh.offset), out.appendUint64Le(sh.size);
...littleEndian64(sh.size), out.appendUint32Le(sh.link);
...littleEndian32(sh.link), out.appendUint32Le(sh.info);
...littleEndian32(sh.info), out.appendUint64Le(sh.addralign);
...littleEndian64(sh.addralign), out.appendUint64Le(sh.entsize);
...littleEndian64(sh.entsize),
]);
}; };
// null section // null section
@ -1035,12 +1054,12 @@ function lower(ast) {
}); });
} }
// r_offset // r_offset
rel.append([...littleEndian32(relocation.offset), ...[0, 0, 0, 0]]); rel.appendUint64Le(relocation.offset);
// r_info type,sym // r_info type,sym
rel.append(littleEndian32(relocation.kind)); rel.appendUint32Le(relocation.kind);
rel.append(littleEndian32(idx)); rel.appendUint32Le(idx);
// r_addend // r_addend
rel.append(signedLittleEndian64(relocation.addend)); rel.appendUint64Le(relocation.addend);
} }
const symtabIndex = sectionCount + 1; const symtabIndex = sectionCount + 1;
writeSectionHeader(".rela", { writeSectionHeader(".rela", {
@ -1060,15 +1079,13 @@ function lower(ast) {
let symIdx = 0; let symIdx = 0;
for (const sym of symbols) { for (const sym of symbols) {
const nameIdx = strs.pushAndGet(sym.name); const nameIdx = strs.pushAndGet(sym.name);
symtab.appendUint32Le(nameIdx);
symtab.appendUint8(sym.type | (sym.binding << 4));
symtab.appendUint8(sym.visibility);
symtab.appendUint16Le(sym.sectionIndex);
symtab.appendUint64Le(sym.value);
symtab.appendUint64Le(sym.size);
symtab.append([
...littleEndian32(nameIdx),
sym.type | (sym.binding << 4),
sym.visibility,
/*shndx*/ ...littleEndian16(sym.sectionIndex),
/*value*/ ...littleEndian64(sym.value),
/*size*/ ...littleEndian64(sym.size),
]);
nameToSymIdx.set(sym.name, symIdx); nameToSymIdx.set(sym.name, symIdx);
symIdx++; symIdx++;
} }