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Partially revert some changes.

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The call_arena is still re-added, and the call_depth is still used, but
the call_arena and scope_arenas are no longer part of the Env - they remain on
the Executor.

This is to accommodate upcoming changes where multiple executors will exist at
once. While the shared allocators _might_ have been safe in some cases, the
performance gains don't justify the risk of having 2 executors interacting in a
way where sharing the allocators would cause issues.
This commit is contained in:
Karl Seguin
2025-04-22 16:56:26 +08:00
parent 3277d1baac
commit 114e11f52a
1 changed files with 20 additions and 19 deletions
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39
src/runtime/js.zig
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@@ -183,11 +183,6 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
// Used in debug mode to assert that we only have one executor at a time
has_executor: if (builtin.mode == .Debug) bool else void = if (builtin.mode == .Debug) false else {},
// See the Executor's call_arena and scope_arena allocators. Having these
// here allows the arena to be re-used by different executors.
call_arena: ArenaAllocator,
scope_arena: ArenaAllocator,
const Self = @This();
const State = S;
@@ -223,8 +218,6 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
.gc_hints = opts.gc_hints,
.global_scope = global_scope,
.prototype_lookup = undefined,
.call_arena = ArenaAllocator.init(allocator),
.scope_arena = ArenaAllocator.init(allocator),
.executor_pool = std.heap.MemoryPool(Executor).init(allocator),
};
@@ -260,8 +253,6 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
}
pub fn deinit(self: *Self) void {
self.call_arena.deinit();
self.scope_arena.deinit();
self.global_scope.deinit();
self.isolate.exit();
self.isolate.deinit();
@@ -357,14 +348,22 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
.isolate = isolate,
.templates = templates,
.handle_scope = handle_scope,
.call_arena = self.call_arena.allocator(),
.scope_arena = self.scope_arena.allocator(),
.call_arena = undefined,
.scope_arena = undefined,
._call_arena_instance = std.heap.ArenaAllocator.init(self.allocator),
._scope_arena_instance = std.heap.ArenaAllocator.init(self.allocator),
.module_loader = .{
.ptr = @ptrCast(module_loader),
.func = @TypeOf(module_loader.*).fetchModuleSource,
},
};
// We do it this way, just to present a slightly nicer API. Many
// things want one of these two allocator from the executor. Now they
// can do `executor.call_arena` instead of `executor.call_arena.allocator`.
executor.call_arena = executor._call_arena_instance.allocator();
executor.scope_arena = executor._scope_arena_instance.allocator();
errdefer self.stopExecutor(executor);
// Custom exception
@@ -397,8 +396,6 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
std.debug.assert(self.has_executor == true);
self.has_executor = false;
}
_ = self.call_arena.reset(.{ .retain_with_limit = CALL_ARENA_RETAIN });
_ = self.scope_arena.reset(.{ .retain_with_limit = SCOPE_ARENA_RETAIN });
}
// Give it a Zig struct, get back a v8.FunctionTemplate.
@@ -791,6 +788,7 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
// arena itself is owned by the Executor so that we can re-use it
// from scope to scope.
call_arena: Allocator,
_call_arena_instance: std.heap.ArenaAllocator,
// Arena whose lifetime is for a single page load, aka a Scope. Where
// the call_arena lives for a single function call, the scope_arena
@@ -798,6 +796,7 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
// owned by the Scope, but the arena itself is owned by the Executor
// so that we can re-use it from scope to scope.
scope_arena: Allocator,
_scope_arena_instance: std.heap.ArenaAllocator,
// When we need to load a resource (i.e. an external script), we call
// this function to get the source. This is always a reference to the
@@ -825,6 +824,9 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
}
self.context.exit();
self.handle_scope.deinit();
self._call_arena_instance.deinit();
self._scope_arena_instance.deinit();
}
// Executes the src
@@ -925,8 +927,7 @@ pub fn Env(comptime S: type, comptime types: anytype) type {
pub fn endScope(self: *Executor) void {
self.scope.?.deinit();
self.scope = null;
const scope_arena: *std.heap.ArenaAllocator = @ptrCast(@alignCast(self.scope_arena.ptr));
_ = scope_arena.reset(.{ .retain_with_limit = SCOPE_ARENA_RETAIN });
_ = self._scope_arena_instance.reset(.{ .retain_with_limit = SCOPE_ARENA_RETAIN });
}
// Given an anytype, turns it into a v8.Object. The anytype could be:
@@ -1540,8 +1541,9 @@ fn Caller(comptime E: type) type {
}
fn deinit(self: *Self) void {
const call_depth = self.executor.call_depth - 1;
self.executor.call_depth = call_depth;
const executor = self.executor;
const call_depth = executor.call_depth - 1;
executor.call_depth = call_depth;
// Because of callbacks, calls can be nested. Because of this, we
// can't clear the call_arena after _every_ call. Imagine we have
@@ -1555,8 +1557,7 @@ fn Caller(comptime E: type) type {
// Therefore, we keep a call_depth, and only reset the call_arena
// when a top-level (call_depth == 0) function ends.
if (call_depth == 0) {
const call_arena: *std.heap.ArenaAllocator = @ptrCast(@alignCast(self.call_arena.ptr));
_ = call_arena.reset(.{ .retain_with_limit = CALL_ARENA_RETAIN });
_ = executor._call_arena_instance.reset(.{ .retain_with_limit = CALL_ARENA_RETAIN });
}
}