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compilation.zig
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compilation.zig
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const std = @import("std");
const io = std.io;
const mem = std.mem;
const Allocator = mem.Allocator;
const Buffer = std.Buffer;
const llvm = @import("llvm.zig");
const c = @import("c.zig");
const builtin = std.builtin;
const Target = std.Target;
const warn = std.debug.warn;
const Token = std.zig.Token;
const ArrayList = std.ArrayList;
const errmsg = @import("errmsg.zig");
const ast = std.zig.ast;
const event = std.event;
const assert = std.debug.assert;
const AtomicRmwOp = builtin.AtomicRmwOp;
const AtomicOrder = builtin.AtomicOrder;
const Scope = @import("scope.zig").Scope;
const Decl = @import("decl.zig").Decl;
const ir = @import("ir.zig");
const Visib = @import("visib.zig").Visib;
const Value = @import("value.zig").Value;
const Type = Value.Type;
const Span = errmsg.Span;
const Msg = errmsg.Msg;
const codegen = @import("codegen.zig");
const Package = @import("package.zig").Package;
const link = @import("link.zig").link;
const LibCInstallation = @import("libc_installation.zig").LibCInstallation;
const CInt = @import("c_int.zig").CInt;
const fs = event.fs;
const util = @import("util.zig");
const max_src_size = 2 * 1024 * 1024 * 1024; // 2 GiB
/// Data that is local to the event loop.
pub const ZigCompiler = struct {
llvm_handle_pool: std.atomic.Stack(*llvm.Context),
lld_lock: event.Lock,
allocator: *Allocator,
/// TODO pool these so that it doesn't have to lock
prng: event.Locked(std.rand.DefaultPrng),
native_libc: event.Future(LibCInstallation),
var lazy_init_targets = std.lazyInit(void);
pub fn init(allocator: *Allocator) !ZigCompiler {
lazy_init_targets.get() orelse {
util.initializeAllTargets();
lazy_init_targets.resolve();
};
var seed_bytes: [@sizeOf(u64)]u8 = undefined;
try std.crypto.randomBytes(seed_bytes[0..]);
const seed = mem.readIntNative(u64, &seed_bytes);
return ZigCompiler{
.allocator = allocator,
.lld_lock = event.Lock.init(),
.llvm_handle_pool = std.atomic.Stack(*llvm.Context).init(),
.prng = event.Locked(std.rand.DefaultPrng).init(std.rand.DefaultPrng.init(seed)),
.native_libc = event.Future(LibCInstallation).init(),
};
}
/// Must be called only after EventLoop.run completes.
fn deinit(self: *ZigCompiler) void {
self.lld_lock.deinit();
while (self.llvm_handle_pool.pop()) |node| {
llvm.ContextDispose(node.data);
self.allocator.destroy(node);
}
}
/// Gets an exclusive handle on any LlvmContext.
/// Caller must release the handle when done.
pub fn getAnyLlvmContext(self: *ZigCompiler) !LlvmHandle {
if (self.llvm_handle_pool.pop()) |node| return LlvmHandle{ .node = node };
const context_ref = llvm.ContextCreate() orelse return error.OutOfMemory;
errdefer llvm.ContextDispose(context_ref);
const node = try self.allocator.create(std.atomic.Stack(*llvm.Context).Node);
node.* = std.atomic.Stack(*llvm.Context).Node{
.next = undefined,
.data = context_ref,
};
errdefer self.allocator.destroy(node);
return LlvmHandle{ .node = node };
}
pub async fn getNativeLibC(self: *ZigCompiler) !*LibCInstallation {
if (self.native_libc.start()) |ptr| return ptr;
try self.native_libc.data.findNative(self.allocator);
self.native_libc.resolve();
return &self.native_libc.data;
}
/// Must be called only once, ever. Sets global state.
pub fn setLlvmArgv(allocator: *Allocator, llvm_argv: []const []const u8) !void {
if (llvm_argv.len != 0) {
var c_compatible_args = try std.cstr.NullTerminated2DArray.fromSlices(allocator, [_][]const []const u8{
[_][]const u8{"zig (LLVM option parsing)"},
llvm_argv,
});
defer c_compatible_args.deinit();
c.ZigLLVMParseCommandLineOptions(llvm_argv.len + 1, c_compatible_args.ptr);
}
}
};
pub const LlvmHandle = struct {
node: *std.atomic.Stack(*llvm.Context).Node,
pub fn release(self: LlvmHandle, zig_compiler: *ZigCompiler) void {
zig_compiler.llvm_handle_pool.push(self.node);
}
};
pub const Compilation = struct {
zig_compiler: *ZigCompiler,
name: Buffer,
llvm_triple: Buffer,
root_src_path: ?[]const u8,
target: Target,
llvm_target: *llvm.Target,
build_mode: builtin.Mode,
zig_lib_dir: []const u8,
zig_std_dir: []const u8,
/// lazily created when we need it
tmp_dir: event.Future(BuildError![]u8),
version_major: u32,
version_minor: u32,
version_patch: u32,
linker_script: ?[]const u8,
out_h_path: ?[]const u8,
is_test: bool,
each_lib_rpath: bool,
strip: bool,
is_static: bool,
linker_rdynamic: bool,
clang_argv: []const []const u8,
lib_dirs: []const []const u8,
rpath_list: []const []const u8,
assembly_files: []const []const u8,
/// paths that are explicitly provided by the user to link against
link_objects: []const []const u8,
/// functions that have their own objects that we need to link
/// it uses an optional pointer so that tombstone removals are possible
fn_link_set: event.Locked(FnLinkSet),
pub const FnLinkSet = std.TailQueue(?*Value.Fn);
windows_subsystem_windows: bool,
windows_subsystem_console: bool,
link_libs_list: ArrayList(*LinkLib),
libc_link_lib: ?*LinkLib,
err_color: errmsg.Color,
verbose_tokenize: bool,
verbose_ast_tree: bool,
verbose_ast_fmt: bool,
verbose_cimport: bool,
verbose_ir: bool,
verbose_llvm_ir: bool,
verbose_link: bool,
darwin_frameworks: []const []const u8,
darwin_version_min: DarwinVersionMin,
test_filters: []const []const u8,
test_name_prefix: ?[]const u8,
emit_file_type: Emit,
kind: Kind,
link_out_file: ?[]const u8,
events: *event.Channel(Event),
exported_symbol_names: event.Locked(Decl.Table),
/// Before code generation starts, must wait on this group to make sure
/// the build is complete.
prelink_group: event.Group(BuildError!void),
compile_errors: event.Locked(CompileErrList),
meta_type: *Type.MetaType,
void_type: *Type.Void,
bool_type: *Type.Bool,
noreturn_type: *Type.NoReturn,
comptime_int_type: *Type.ComptimeInt,
u8_type: *Type.Int,
void_value: *Value.Void,
true_value: *Value.Bool,
false_value: *Value.Bool,
noreturn_value: *Value.NoReturn,
target_machine: *llvm.TargetMachine,
target_data_ref: *llvm.TargetData,
target_layout_str: [*]u8,
target_ptr_bits: u32,
/// for allocating things which have the same lifetime as this Compilation
arena_allocator: std.heap.ArenaAllocator,
root_package: *Package,
std_package: *Package,
override_libc: ?*LibCInstallation,
/// need to wait on this group before deinitializing
deinit_group: event.Group(void),
// destroy_frame: @Frame(createAsync),
// main_loop_frame: @Frame(Compilation.mainLoop),
main_loop_future: event.Future(void),
have_err_ret_tracing: bool,
/// not locked because it is read-only
primitive_type_table: TypeTable,
int_type_table: event.Locked(IntTypeTable),
array_type_table: event.Locked(ArrayTypeTable),
ptr_type_table: event.Locked(PtrTypeTable),
fn_type_table: event.Locked(FnTypeTable),
c_int_types: [CInt.list.len]*Type.Int,
// fs_watch: *fs.Watch(*Scope.Root),
const IntTypeTable = std.HashMap(*const Type.Int.Key, *Type.Int, Type.Int.Key.hash, Type.Int.Key.eql);
const ArrayTypeTable = std.HashMap(*const Type.Array.Key, *Type.Array, Type.Array.Key.hash, Type.Array.Key.eql);
const PtrTypeTable = std.HashMap(*const Type.Pointer.Key, *Type.Pointer, Type.Pointer.Key.hash, Type.Pointer.Key.eql);
const FnTypeTable = std.HashMap(*const Type.Fn.Key, *Type.Fn, Type.Fn.Key.hash, Type.Fn.Key.eql);
const TypeTable = std.StringHashMap(*Type);
const CompileErrList = std.ArrayList(*Msg);
// TODO handle some of these earlier and report them in a way other than error codes
pub const BuildError = error{
OutOfMemory,
EndOfStream,
IsDir,
Unexpected,
SystemResources,
SharingViolation,
PathAlreadyExists,
FileNotFound,
AccessDenied,
PipeBusy,
FileTooBig,
SymLinkLoop,
ProcessFdQuotaExceeded,
NameTooLong,
SystemFdQuotaExceeded,
NoDevice,
NoSpaceLeft,
NotDir,
FileSystem,
OperationAborted,
IoPending,
BrokenPipe,
WouldBlock,
FileClosed,
DestinationAddressRequired,
DiskQuota,
InputOutput,
NoStdHandles,
Overflow,
NotSupported,
BufferTooSmall,
Unimplemented, // TODO remove this one
SemanticAnalysisFailed, // TODO remove this one
ReadOnlyFileSystem,
LinkQuotaExceeded,
EnvironmentVariableNotFound,
AppDataDirUnavailable,
LinkFailed,
LibCRequiredButNotProvidedOrFound,
LibCMissingDynamicLinker,
InvalidDarwinVersionString,
UnsupportedLinkArchitecture,
UserResourceLimitReached,
InvalidUtf8,
BadPathName,
DeviceBusy,
CurrentWorkingDirectoryUnlinked,
};
pub const Event = union(enum) {
Ok,
Error: BuildError,
Fail: []*Msg,
};
pub const DarwinVersionMin = union(enum) {
None,
MacOS: []const u8,
Ios: []const u8,
};
pub const Kind = enum {
Exe,
Lib,
Obj,
};
pub const LinkLib = struct {
name: []const u8,
path: ?[]const u8,
/// the list of symbols we depend on from this lib
symbols: ArrayList([]u8),
provided_explicitly: bool,
};
pub const Emit = enum {
Binary,
Assembly,
LlvmIr,
};
pub fn create(
zig_compiler: *ZigCompiler,
name: []const u8,
root_src_path: ?[]const u8,
target: Target,
kind: Kind,
build_mode: builtin.Mode,
is_static: bool,
zig_lib_dir: []const u8,
) !*Compilation {
var optional_comp: ?*Compilation = null;
var frame = async createAsync(
&optional_comp,
zig_compiler,
name,
root_src_path,
target,
kind,
build_mode,
is_static,
zig_lib_dir,
);
return optional_comp orelse if (await frame) |_| unreachable else |err| err;
}
async fn createAsync(
out_comp: *?*Compilation,
zig_compiler: *ZigCompiler,
name: []const u8,
root_src_path: ?[]const u8,
target: Target,
kind: Kind,
build_mode: builtin.Mode,
is_static: bool,
zig_lib_dir: []const u8,
) !void {
const allocator = zig_compiler.allocator;
var comp = Compilation{
.arena_allocator = std.heap.ArenaAllocator.init(allocator),
.zig_compiler = zig_compiler,
.events = undefined,
.root_src_path = root_src_path,
.target = target,
.llvm_target = undefined,
.kind = kind,
.build_mode = build_mode,
.zig_lib_dir = zig_lib_dir,
.zig_std_dir = undefined,
.tmp_dir = event.Future(BuildError![]u8).init(),
// .destroy_frame = @frame(),
// .main_loop_frame = undefined,
.main_loop_future = event.Future(void).init(),
.name = undefined,
.llvm_triple = undefined,
.version_major = 0,
.version_minor = 0,
.version_patch = 0,
.verbose_tokenize = false,
.verbose_ast_tree = false,
.verbose_ast_fmt = false,
.verbose_cimport = false,
.verbose_ir = false,
.verbose_llvm_ir = false,
.verbose_link = false,
.linker_script = null,
.out_h_path = null,
.is_test = false,
.each_lib_rpath = false,
.strip = false,
.is_static = is_static,
.linker_rdynamic = false,
.clang_argv = [_][]const u8{},
.lib_dirs = [_][]const u8{},
.rpath_list = [_][]const u8{},
.assembly_files = [_][]const u8{},
.link_objects = [_][]const u8{},
.fn_link_set = event.Locked(FnLinkSet).init(FnLinkSet.init()),
.windows_subsystem_windows = false,
.windows_subsystem_console = false,
.link_libs_list = undefined,
.libc_link_lib = null,
.err_color = errmsg.Color.Auto,
.darwin_frameworks = [_][]const u8{},
.darwin_version_min = DarwinVersionMin.None,
.test_filters = [_][]const u8{},
.test_name_prefix = null,
.emit_file_type = Emit.Binary,
.link_out_file = null,
.exported_symbol_names = event.Locked(Decl.Table).init(Decl.Table.init(allocator)),
.prelink_group = event.Group(BuildError!void).init(allocator),
.deinit_group = event.Group(void).init(allocator),
.compile_errors = event.Locked(CompileErrList).init(CompileErrList.init(allocator)),
.int_type_table = event.Locked(IntTypeTable).init(IntTypeTable.init(allocator)),
.array_type_table = event.Locked(ArrayTypeTable).init(ArrayTypeTable.init(allocator)),
.ptr_type_table = event.Locked(PtrTypeTable).init(PtrTypeTable.init(allocator)),
.fn_type_table = event.Locked(FnTypeTable).init(FnTypeTable.init(allocator)),
.c_int_types = undefined,
.meta_type = undefined,
.void_type = undefined,
.void_value = undefined,
.bool_type = undefined,
.true_value = undefined,
.false_value = undefined,
.noreturn_type = undefined,
.noreturn_value = undefined,
.comptime_int_type = undefined,
.u8_type = undefined,
.target_machine = undefined,
.target_data_ref = undefined,
.target_layout_str = undefined,
.target_ptr_bits = target.getArchPtrBitWidth(),
.root_package = undefined,
.std_package = undefined,
.override_libc = null,
.have_err_ret_tracing = false,
.primitive_type_table = undefined,
// .fs_watch = undefined,
};
comp.link_libs_list = ArrayList(*LinkLib).init(comp.arena());
comp.primitive_type_table = TypeTable.init(comp.arena());
defer {
comp.int_type_table.private_data.deinit();
comp.array_type_table.private_data.deinit();
comp.ptr_type_table.private_data.deinit();
comp.fn_type_table.private_data.deinit();
comp.arena_allocator.deinit();
}
comp.name = try Buffer.init(comp.arena(), name);
comp.llvm_triple = try util.getTriple(comp.arena(), target);
comp.llvm_target = try util.llvmTargetFromTriple(comp.llvm_triple);
comp.zig_std_dir = try std.fs.path.join(comp.arena(), [_][]const u8{ zig_lib_dir, "std" });
const opt_level = switch (build_mode) {
.Debug => llvm.CodeGenLevelNone,
else => llvm.CodeGenLevelAggressive,
};
const reloc_mode = if (is_static) llvm.RelocStatic else llvm.RelocPIC;
// LLVM creates invalid binaries on Windows sometimes.
// See https://github.com/ziglang/zig/issues/508
// As a workaround we do not use target native features on Windows.
var target_specific_cpu_args: ?[*:0]u8 = null;
var target_specific_cpu_features: ?[*:0]u8 = null;
defer llvm.DisposeMessage(target_specific_cpu_args);
defer llvm.DisposeMessage(target_specific_cpu_features);
if (target == Target.Native and !target.isWindows()) {
target_specific_cpu_args = llvm.GetHostCPUName() orelse return error.OutOfMemory;
target_specific_cpu_features = llvm.GetNativeFeatures() orelse return error.OutOfMemory;
}
comp.target_machine = llvm.CreateTargetMachine(
comp.llvm_target,
comp.llvm_triple.toSliceConst(),
target_specific_cpu_args orelse "",
target_specific_cpu_features orelse "",
opt_level,
reloc_mode,
llvm.CodeModelDefault,
false, // TODO: add -ffunction-sections option
) orelse return error.OutOfMemory;
defer llvm.DisposeTargetMachine(comp.target_machine);
comp.target_data_ref = llvm.CreateTargetDataLayout(comp.target_machine) orelse return error.OutOfMemory;
defer llvm.DisposeTargetData(comp.target_data_ref);
comp.target_layout_str = llvm.CopyStringRepOfTargetData(comp.target_data_ref) orelse return error.OutOfMemory;
defer llvm.DisposeMessage(comp.target_layout_str);
comp.events = try allocator.create(event.Channel(Event));
defer allocator.destroy(comp.events);
comp.events.init([0]Event{});
defer comp.events.deinit();
if (root_src_path) |root_src| {
const dirname = std.fs.path.dirname(root_src) orelse ".";
const basename = std.fs.path.basename(root_src);
comp.root_package = try Package.create(comp.arena(), dirname, basename);
comp.std_package = try Package.create(comp.arena(), comp.zig_std_dir, "std.zig");
try comp.root_package.add("std", comp.std_package);
} else {
comp.root_package = try Package.create(comp.arena(), ".", "");
}
// comp.fs_watch = try fs.Watch(*Scope.Root).create(16);
// defer comp.fs_watch.destroy();
try comp.initTypes();
defer comp.primitive_type_table.deinit();
// comp.main_loop_frame = async comp.mainLoop();
// Set this to indicate that initialization completed successfully.
// from here on out we must not return an error.
// This must occur before the first suspend/await.
out_comp.* = ∁
// This suspend is resumed by destroy()
suspend;
// From here on is cleanup.
comp.deinit_group.wait();
if (comp.tmp_dir.getOrNull()) |tmp_dir_result|
if (tmp_dir_result.*) |tmp_dir| {
// TODO evented I/O?
std.fs.deleteTree(tmp_dir) catch {};
} else |_| {};
}
/// it does ref the result because it could be an arbitrary integer size
pub async fn getPrimitiveType(comp: *Compilation, name: []const u8) !?*Type {
if (name.len >= 2) {
switch (name[0]) {
'i', 'u' => blk: {
for (name[1..]) |byte|
switch (byte) {
'0'...'9' => {},
else => break :blk,
};
const is_signed = name[0] == 'i';
const bit_count = std.fmt.parseUnsigned(u32, name[1..], 10) catch |err| switch (err) {
error.Overflow => return error.Overflow,
error.InvalidCharacter => unreachable, // we just checked the characters above
};
const int_type = try Type.Int.get(comp, Type.Int.Key{
.bit_count = bit_count,
.is_signed = is_signed,
});
errdefer int_type.base.base.deref();
return &int_type.base;
},
else => {},
}
}
if (comp.primitive_type_table.get(name)) |entry| {
entry.value.base.ref();
return entry.value;
}
return null;
}
fn initTypes(comp: *Compilation) !void {
comp.meta_type = try comp.arena().create(Type.MetaType);
comp.meta_type.* = Type.MetaType{
.base = Type{
.name = "type",
.base = Value{
.id = .Type,
.typ = undefined,
.ref_count = std.atomic.Int(usize).init(3), // 3 because it references itself twice
},
.id = .Type,
.abi_alignment = Type.AbiAlignment.init(),
},
.value = undefined,
};
comp.meta_type.value = &comp.meta_type.base;
comp.meta_type.base.base.typ = &comp.meta_type.base;
assert((try comp.primitive_type_table.put(comp.meta_type.base.name, &comp.meta_type.base)) == null);
comp.void_type = try comp.arena().create(Type.Void);
comp.void_type.* = Type.Void{
.base = Type{
.name = "void",
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .Void,
.abi_alignment = Type.AbiAlignment.init(),
},
};
assert((try comp.primitive_type_table.put(comp.void_type.base.name, &comp.void_type.base)) == null);
comp.noreturn_type = try comp.arena().create(Type.NoReturn);
comp.noreturn_type.* = Type.NoReturn{
.base = Type{
.name = "noreturn",
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .NoReturn,
.abi_alignment = Type.AbiAlignment.init(),
},
};
assert((try comp.primitive_type_table.put(comp.noreturn_type.base.name, &comp.noreturn_type.base)) == null);
comp.comptime_int_type = try comp.arena().create(Type.ComptimeInt);
comp.comptime_int_type.* = Type.ComptimeInt{
.base = Type{
.name = "comptime_int",
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .ComptimeInt,
.abi_alignment = Type.AbiAlignment.init(),
},
};
assert((try comp.primitive_type_table.put(comp.comptime_int_type.base.name, &comp.comptime_int_type.base)) == null);
comp.bool_type = try comp.arena().create(Type.Bool);
comp.bool_type.* = Type.Bool{
.base = Type{
.name = "bool",
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .Bool,
.abi_alignment = Type.AbiAlignment.init(),
},
};
assert((try comp.primitive_type_table.put(comp.bool_type.base.name, &comp.bool_type.base)) == null);
comp.void_value = try comp.arena().create(Value.Void);
comp.void_value.* = Value.Void{
.base = Value{
.id = .Void,
.typ = &Type.Void.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
};
comp.true_value = try comp.arena().create(Value.Bool);
comp.true_value.* = Value.Bool{
.base = Value{
.id = .Bool,
.typ = &Type.Bool.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.x = true,
};
comp.false_value = try comp.arena().create(Value.Bool);
comp.false_value.* = Value.Bool{
.base = Value{
.id = .Bool,
.typ = &Type.Bool.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.x = false,
};
comp.noreturn_value = try comp.arena().create(Value.NoReturn);
comp.noreturn_value.* = Value.NoReturn{
.base = Value{
.id = .NoReturn,
.typ = &Type.NoReturn.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
};
for (CInt.list) |cint, i| {
const c_int_type = try comp.arena().create(Type.Int);
c_int_type.* = Type.Int{
.base = Type{
.name = cint.zig_name,
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .Int,
.abi_alignment = Type.AbiAlignment.init(),
},
.key = Type.Int.Key{
.is_signed = cint.is_signed,
.bit_count = cint.sizeInBits(comp.target),
},
.garbage_node = undefined,
};
comp.c_int_types[i] = c_int_type;
assert((try comp.primitive_type_table.put(cint.zig_name, &c_int_type.base)) == null);
}
comp.u8_type = try comp.arena().create(Type.Int);
comp.u8_type.* = Type.Int{
.base = Type{
.name = "u8",
.base = Value{
.id = .Type,
.typ = &Type.MetaType.get(comp).base,
.ref_count = std.atomic.Int(usize).init(1),
},
.id = .Int,
.abi_alignment = Type.AbiAlignment.init(),
},
.key = Type.Int.Key{
.is_signed = false,
.bit_count = 8,
},
.garbage_node = undefined,
};
assert((try comp.primitive_type_table.put(comp.u8_type.base.name, &comp.u8_type.base)) == null);
}
pub fn destroy(self: *Compilation) void {
// await self.main_loop_frame;
// resume self.destroy_frame;
}
fn start(self: *Compilation) void {
self.main_loop_future.resolve();
}
async fn mainLoop(self: *Compilation) void {
// wait until start() is called
_ = self.main_loop_future.get();
var build_result = self.initialCompile();
while (true) {
const link_result = if (build_result) blk: {
break :blk self.maybeLink();
} else |err| err;
// this makes a handy error return trace and stack trace in debug mode
if (std.debug.runtime_safety) {
link_result catch unreachable;
}
const compile_errors = blk: {
const held = self.compile_errors.acquire();
defer held.release();
break :blk held.value.toOwnedSlice();
};
if (link_result) |_| {
if (compile_errors.len == 0) {
self.events.put(Event.Ok);
} else {
self.events.put(Event{ .Fail = compile_errors });
}
} else |err| {
// if there's an error then the compile errors have dangling references
self.gpa().free(compile_errors);
self.events.put(Event{ .Error = err });
}
// // First, get an item from the watch channel, waiting on the channel.
// var group = event.Group(BuildError!void).init(self.gpa());
// {
// const ev = (self.fs_watch.channel.get()) catch |err| {
// build_result = err;
// continue;
// };
// const root_scope = ev.data;
// group.call(rebuildFile, self, root_scope) catch |err| {
// build_result = err;
// continue;
// };
// }
// // Next, get all the items from the channel that are buffered up.
// while (self.fs_watch.channel.getOrNull()) |ev_or_err| {
// if (ev_or_err) |ev| {
// const root_scope = ev.data;
// group.call(rebuildFile, self, root_scope) catch |err| {
// build_result = err;
// continue;
// };
// } else |err| {
// build_result = err;
// continue;
// }
// }
// build_result = group.wait();
}
}
async fn rebuildFile(self: *Compilation, root_scope: *Scope.Root) !void {
const tree_scope = blk: {
const source_code = "";
// const source_code = fs.readFile(
// root_scope.realpath,
// max_src_size,
// ) catch |err| {
// try self.addCompileErrorCli(root_scope.realpath, "unable to open: {}", @errorName(err));
// return;
// };
// errdefer self.gpa().free(source_code);
const tree = try std.zig.parse(self.gpa(), source_code);
errdefer {
tree.deinit();
}
break :blk try Scope.AstTree.create(self, tree, root_scope);
};
defer tree_scope.base.deref(self);
var error_it = tree_scope.tree.errors.iterator(0);
while (error_it.next()) |parse_error| {
const msg = try Msg.createFromParseErrorAndScope(self, tree_scope, parse_error);
errdefer msg.destroy();
try self.addCompileErrorAsync(msg);
}
if (tree_scope.tree.errors.len != 0) {
return;
}
const locked_table = root_scope.decls.table.acquireWrite();
defer locked_table.release();
var decl_group = event.Group(BuildError!void).init(self.gpa());
try self.rebuildChangedDecls(
&decl_group,
locked_table.value,
root_scope.decls,
&tree_scope.tree.root_node.decls,
tree_scope,
);
try decl_group.wait();
}
async fn rebuildChangedDecls(
self: *Compilation,
group: *event.Group(BuildError!void),
locked_table: *Decl.Table,
decl_scope: *Scope.Decls,
ast_decls: *ast.Node.Root.DeclList,
tree_scope: *Scope.AstTree,
) !void {
var existing_decls = try locked_table.clone();
defer existing_decls.deinit();
var ast_it = ast_decls.iterator(0);
while (ast_it.next()) |decl_ptr| {
const decl = decl_ptr.*;
switch (decl.id) {
.Comptime => {
const comptime_node = @fieldParentPtr(ast.Node.Comptime, "base", decl);
// TODO connect existing comptime decls to updated source files
try self.prelink_group.call(addCompTimeBlock, self, tree_scope, &decl_scope.base, comptime_node);
},
.VarDecl => @panic("TODO"),
.FnProto => {
const fn_proto = @fieldParentPtr(ast.Node.FnProto, "base", decl);
const name = if (fn_proto.name_token) |name_token| tree_scope.tree.tokenSlice(name_token) else {
try self.addCompileError(tree_scope, Span{
.first = fn_proto.fn_token,
.last = fn_proto.fn_token + 1,
}, "missing function name");
continue;
};
if (existing_decls.remove(name)) |entry| {
// compare new code to existing
if (entry.value.cast(Decl.Fn)) |existing_fn_decl| {
// Just compare the old bytes to the new bytes of the top level decl.
// Even if the AST is technically the same, we want error messages to display
// from the most recent source.
const old_decl_src = existing_fn_decl.base.tree_scope.tree.getNodeSource(
&existing_fn_decl.fn_proto.base,
);
const new_decl_src = tree_scope.tree.getNodeSource(&fn_proto.base);
if (mem.eql(u8, old_decl_src, new_decl_src)) {
// it's the same, we can skip this decl
continue;
} else {
@panic("TODO decl changed implementation");
// Add the new thing before dereferencing the old thing. This way we don't end
// up pointlessly re-creating things we end up using in the new thing.
}
} else {
@panic("TODO decl changed kind");
}
} else {
// add new decl
const fn_decl = try self.gpa().create(Decl.Fn);
fn_decl.* = Decl.Fn{
.base = Decl{
.id = Decl.Id.Fn,
.name = name,
.visib = parseVisibToken(tree_scope.tree, fn_proto.visib_token),
.resolution = event.Future(BuildError!void).init(),
.parent_scope = &decl_scope.base,
.tree_scope = tree_scope,
},
.value = .Unresolved,
.fn_proto = fn_proto,
};
tree_scope.base.ref();
errdefer self.gpa().destroy(fn_decl);
try group.call(addTopLevelDecl, self, &fn_decl.base, locked_table);
}
},
.TestDecl => @panic("TODO"),
else => unreachable,
}
}
var existing_decl_it = existing_decls.iterator();
while (existing_decl_it.next()) |entry| {
// this decl was deleted
const existing_decl = entry.value;
@panic("TODO handle decl deletion");
}
}
async fn initialCompile(self: *Compilation) !void {
if (self.root_src_path) |root_src_path| {
const root_scope = blk: {
// TODO async/await std.fs.realpath
const root_src_real_path = std.fs.realpathAlloc(self.gpa(), root_src_path) catch |err| {
try self.addCompileErrorCli(root_src_path, "unable to open: {}", @errorName(err));
return;
};
errdefer self.gpa().free(root_src_real_path);
break :blk try Scope.Root.create(self, root_src_real_path);
};
defer root_scope.base.deref(self);
// assert((try self.fs_watch.addFile(root_scope.realpath, root_scope)) == null);
try self.rebuildFile(root_scope);
}
}
async fn maybeLink(self: *Compilation) !void {
(self.prelink_group.wait()) catch |err| switch (err) {
error.SemanticAnalysisFailed => {},
else => return err,
};
const any_prelink_errors = blk: {
const compile_errors = self.compile_errors.acquire();
defer compile_errors.release();
break :blk compile_errors.value.len != 0;
};
if (!any_prelink_errors) {
try link(self);
}
}