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esm bytecode (#26402)

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### What does this PR do?

### How did you verify your code works?

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
This commit is contained in:
Alistair Smith
2026-01-30 01:38:45 -08:00
committed by GitHub
parent 8f61adf494
commit 71ce550cfa
34 changed files with 2572 additions and 145 deletions
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34
src/StandaloneModuleGraph.zig
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@@ -92,6 +92,10 @@ pub const StandaloneModuleGraph = struct {
contents: Schema.StringPointer = .{},
sourcemap: Schema.StringPointer = .{},
bytecode: Schema.StringPointer = .{},
module_info: Schema.StringPointer = .{},
/// The file path used when generating bytecode (e.g., "B:/~BUN/root/app.js").
/// Must match exactly at runtime for bytecode cache hits.
bytecode_origin_path: Schema.StringPointer = .{},
encoding: Encoding = .latin1,
loader: bun.options.Loader = .file,
module_format: ModuleFormat = .none,
@@ -159,6 +163,10 @@ pub const StandaloneModuleGraph = struct {
encoding: Encoding = .binary,
wtf_string: bun.String = bun.String.empty,
bytecode: []u8 = "",
module_info: []u8 = "",
/// The file path used when generating bytecode (e.g., "B:/~BUN/root/app.js").
/// Must match exactly at runtime for bytecode cache hits.
bytecode_origin_path: []const u8 = "",
module_format: ModuleFormat = .none,
side: FileSide = .server,
@@ -333,6 +341,8 @@ pub const StandaloneModuleGraph = struct {
else
.none,
.bytecode = if (module.bytecode.length > 0) @constCast(sliceTo(raw_bytes, module.bytecode)) else &.{},
.module_info = if (module.module_info.length > 0) @constCast(sliceTo(raw_bytes, module.module_info)) else &.{},
.bytecode_origin_path = if (module.bytecode_origin_path.length > 0) sliceToZ(raw_bytes, module.bytecode_origin_path) else "",
.module_format = module.module_format,
.side = module.side,
},
@@ -382,6 +392,8 @@ pub const StandaloneModuleGraph = struct {
} else if (output_file.output_kind == .bytecode) {
// Allocate up to 256 byte alignment for bytecode
string_builder.cap += (output_file.value.buffer.bytes.len + 255) / 256 * 256 + 256;
} else if (output_file.output_kind == .module_info) {
string_builder.cap += output_file.value.buffer.bytes.len;
} else {
if (entry_point_id == null) {
if (output_file.side == null or output_file.side.? == .server) {
@@ -477,6 +489,19 @@ pub const StandaloneModuleGraph = struct {
}
};
// Embed module_info for ESM bytecode
const module_info: StringPointer = brk: {
if (output_file.module_info_index != std.math.maxInt(u32)) {
const mi_bytes = output_files[output_file.module_info_index].value.buffer.bytes;
const offset = string_builder.len;
const writable = string_builder.writable();
@memcpy(writable[0..mi_bytes.len], mi_bytes[0..mi_bytes.len]);
string_builder.len += mi_bytes.len;
break :brk StringPointer{ .offset = @truncate(offset), .length = @truncate(mi_bytes.len) };
}
break :brk .{};
};
if (comptime bun.Environment.is_canary or bun.Environment.isDebug) {
if (bun.env_var.BUN_FEATURE_FLAG_DUMP_CODE.get()) |dump_code_dir| {
const buf = bun.path_buffer_pool.get();
@@ -498,6 +523,13 @@ pub const StandaloneModuleGraph = struct {
}
}
// When there's bytecode, store the bytecode output file's path as bytecode_origin_path.
// This path was used to generate the bytecode cache and must match at runtime.
const bytecode_origin_path: StringPointer = if (output_file.bytecode_index != std.math.maxInt(u32))
string_builder.appendCountZ(output_files[output_file.bytecode_index].dest_path)
else
.{};
var module = CompiledModuleGraphFile{
.name = string_builder.fmtAppendCountZ("{s}{s}", .{
prefix,
@@ -515,6 +547,8 @@ pub const StandaloneModuleGraph = struct {
else => .none,
} else .none,
.bytecode = bytecode,
.module_info = module_info,
.bytecode_origin_path = bytecode_origin_path,
.side = switch (output_file.side orelse .server) {
.server => .server,
.client => .client,