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stage2: add new Decl subtype, ExternFn

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`ExternFn` will contain a maybe-lib-name if it was defined with
the `extern` keyword like so

```zig
extern "c" fn write(usize, usize, usize) usize;
```

`lib_name` will live as long as `ExternFn` decl does.
This commit is contained in:
Jakub Konka
2022-02-05 17:41:03 +01:00
parent 04f379dd41
commit 556f0ce5bf
8 changed files with 90 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/Module.zig
View File

@@ -501,6 +501,10 @@ pub const Decl = struct {
}
pub fn clearValues(decl: *Decl, gpa: Allocator) void {
if (decl.getExternFn()) |extern_fn| {
extern_fn.deinit(gpa);
gpa.destroy(extern_fn);
}
if (decl.getFunction()) |func| {
func.deinit(gpa);
gpa.destroy(func);
@@ -690,6 +694,13 @@ pub const Decl = struct {
return func;
}
pub fn getExternFn(decl: *const Decl) ?*ExternFn {
if (!decl.owns_tv) return null;
const extern_fn = (decl.val.castTag(.extern_fn) orelse return null).data;
assert(extern_fn.owner_decl == decl);
return extern_fn;
}
pub fn getVariable(decl: *Decl) ?*Var {
if (!decl.owns_tv) return null;
const variable = (decl.val.castTag(.variable) orelse return null).data;
@@ -1320,9 +1331,26 @@ pub const Opaque = struct {
}
};
/// Some extern function struct memory is owned by the Decl's TypedValue.Managed
/// arena allocator.
pub const ExternFn = struct {
/// The Decl that corresponds to the function itself.
owner_decl: *Decl,
/// Library name if specified.
/// For example `extern "c" fn write(...) usize` would have 'c' as library name.
/// Allocated with Module's allocator; outlives the ZIR code.
lib_name: ?[*:0]const u8,
pub fn deinit(extern_fn: *ExternFn, gpa: Allocator) void {
if (extern_fn.lib_name) |lib_name| {
gpa.free(mem.sliceTo(lib_name, 0));
}
}
};
/// Some Fn struct memory is owned by the Decl's TypedValue.Managed arena allocator.
/// Extern functions do not have this data structure; they are represented by
/// the `Decl` only, with a `Value` tag of `extern_fn`.
/// Extern functions do not have this data structure; they are represented by `ExternFn`
/// instead.
pub const Fn = struct {
/// The Decl that corresponds to the function itself.
owner_decl: *Decl,
@@ -3768,8 +3796,8 @@ fn semaDecl(mod: *Module, decl: *Decl) !bool {
}
},
.extern_fn => {
const owner_decl = decl_tv.val.castTag(.extern_fn).?.data;
if (decl == owner_decl) {
const extern_fn = decl_tv.val.castTag(.extern_fn).?.data;
if (extern_fn.owner_decl == decl) {
decl.owns_tv = true;
queue_linker_work = true;
is_extern = true;

22
src/Sema.zig
View File

@@ -5614,10 +5614,24 @@ fn funcCommon(
}
if (is_extern) {
return sema.addConstant(
fn_ty,
try Value.Tag.extern_fn.create(sema.arena, sema.owner_decl),
);
const new_extern_fn = try sema.gpa.create(Module.ExternFn);
errdefer sema.gpa.destroy(new_extern_fn);
const lib_name: ?[*:0]const u8 = if (opt_lib_name) |lib_name| blk: {
break :blk try sema.gpa.dupeZ(u8, lib_name);
} else null;
new_extern_fn.* = Module.ExternFn{
.owner_decl = sema.owner_decl,
.lib_name = lib_name,
};
const extern_fn_payload = try sema.arena.create(Value.Payload.ExternFn);
extern_fn_payload.* = .{
.base = .{ .tag = .extern_fn },
.data = new_extern_fn,
};
return sema.addConstant(fn_ty, Value.initPayload(&extern_fn_payload.base));
}
if (!has_body) {

11
src/arch/aarch64/CodeGen.zig
View File

@@ -1574,8 +1574,15 @@ fn airCall(self: *Self, inst: Air.Inst.Index) !void {
.data = .{ .reg = .x30 },
});
} else if (func_value.castTag(.extern_fn)) |func_payload| {
const decl = func_payload.data;
const n_strx = try macho_file.addExternFn(mem.sliceTo(decl.name, 0));
const extern_fn = func_payload.data;
const decl_name = extern_fn.owner_decl.name;
if (extern_fn.lib_name) |lib_name| {
log.debug("TODO enforce that '{s}' is expected in '{s}' library", .{
decl_name,
lib_name,
});
}
const n_strx = try macho_file.addExternFn(mem.sliceTo(decl_name, 0));
_ = try self.addInst(.{
.tag = .call_extern,

6
src/arch/wasm/CodeGen.zig
View File

@@ -952,7 +952,7 @@ pub const DeclGen = struct {
_ = func_payload;
return self.fail("TODO wasm backend genDecl function pointer", .{});
} else if (decl.val.castTag(.extern_fn)) |extern_fn| {
const ext_decl = extern_fn.data;
const ext_decl = extern_fn.data.owner_decl;
var func_type = try genFunctype(self.gpa, ext_decl.ty, self.target());
func_type.deinit(self.gpa);
ext_decl.fn_link.wasm.type_index = try self.bin_file.putOrGetFuncType(func_type);
@@ -978,7 +978,7 @@ pub const DeclGen = struct {
switch (ty.zigTypeTag()) {
.Fn => {
const fn_decl = switch (val.tag()) {
.extern_fn => val.castTag(.extern_fn).?.data,
.extern_fn => val.castTag(.extern_fn).?.data.owner_decl,
.function => val.castTag(.function).?.data.owner_decl,
else => unreachable,
};
@@ -1776,7 +1776,7 @@ fn airCall(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
if (func_val.castTag(.function)) |func| {
break :blk func.data.owner_decl;
} else if (func_val.castTag(.extern_fn)) |ext_fn| {
break :blk ext_fn.data;
break :blk ext_fn.data.owner_decl;
} else if (func_val.castTag(.decl_ref)) |decl_ref| {
break :blk decl_ref.data;
}

11
src/arch/x86_64/CodeGen.zig
View File

@@ -2516,8 +2516,15 @@ fn airCall(self: *Self, inst: Air.Inst.Index) !void {
.data = undefined,
});
} else if (func_value.castTag(.extern_fn)) |func_payload| {
const decl = func_payload.data;
const n_strx = try macho_file.addExternFn(mem.sliceTo(decl.name, 0));
const extern_fn = func_payload.data;
const decl_name = extern_fn.owner_decl.name;
if (extern_fn.lib_name) |lib_name| {
log.debug("TODO enforce that '{s}' is expected in '{s}' library", .{
decl_name,
lib_name,
});
}
const n_strx = try macho_file.addExternFn(mem.sliceTo(decl_name, 0));
_ = try self.addInst(.{
.tag = .call_extern,
.ops = undefined,

8
src/codegen/c.zig
View File

@@ -542,8 +542,8 @@ pub const DeclGen = struct {
try dg.renderDeclName(func.owner_decl, writer);
},
.extern_fn => {
const decl = val.castTag(.extern_fn).?.data;
try dg.renderDeclName(decl, writer);
const extern_fn = val.castTag(.extern_fn).?.data;
try dg.renderDeclName(extern_fn.owner_decl, writer);
},
.int_u64, .one => {
try writer.writeAll("((");
@@ -681,7 +681,7 @@ pub const DeclGen = struct {
return dg.renderDeclValue(writer, ty, val, decl);
},
.extern_fn => {
const decl = val.castTag(.extern_fn).?.data;
const decl = val.castTag(.extern_fn).?.data.owner_decl;
return dg.renderDeclValue(writer, ty, val, decl);
},
else => unreachable,
@@ -2442,7 +2442,7 @@ fn airCall(f: *Function, inst: Air.Inst.Index) !CValue {
const fn_decl = fn_decl: {
const callee_val = f.air.value(pl_op.operand) orelse break :known;
break :fn_decl switch (callee_val.tag()) {
.extern_fn => callee_val.castTag(.extern_fn).?.data,
.extern_fn => callee_val.castTag(.extern_fn).?.data.owner_decl,
.function => callee_val.castTag(.function).?.data.owner_decl,
.decl_ref => callee_val.castTag(.decl_ref).?.data,
else => break :known,

4
src/codegen/llvm.zig
View File

@@ -622,7 +622,7 @@ pub const DeclGen = struct {
_ = func_payload;
@panic("TODO llvm backend genDecl function pointer");
} else if (decl.val.castTag(.extern_fn)) |extern_fn| {
_ = try dg.resolveLlvmFunction(extern_fn.data);
_ = try dg.resolveLlvmFunction(extern_fn.data.owner_decl);
} else {
const target = dg.module.getTarget();
const global = try dg.resolveGlobalDecl(decl);
@@ -1410,7 +1410,7 @@ pub const DeclGen = struct {
},
.Fn => {
const fn_decl = switch (tv.val.tag()) {
.extern_fn => tv.val.castTag(.extern_fn).?.data,
.extern_fn => tv.val.castTag(.extern_fn).?.data.owner_decl,
.function => tv.val.castTag(.function).?.data.owner_decl,
else => unreachable,
};

19
src/value.zig
View File

@@ -262,9 +262,9 @@ pub const Value = extern union {
.int_big_negative,
=> Payload.BigInt,
.extern_fn,
.decl_ref,
=> Payload.Decl,
.extern_fn => Payload.ExternFn,
.decl_ref => Payload.Decl,
.repeated,
.eu_payload,
@@ -475,7 +475,7 @@ pub const Value = extern union {
return Value{ .ptr_otherwise = &new_payload.base };
},
.function => return self.copyPayloadShallow(arena, Payload.Function),
.extern_fn => return self.copyPayloadShallow(arena, Payload.Decl),
.extern_fn => return self.copyPayloadShallow(arena, Payload.ExternFn),
.variable => return self.copyPayloadShallow(arena, Payload.Variable),
.decl_ref => return self.copyPayloadShallow(arena, Payload.Decl),
.decl_ref_mut => return self.copyPayloadShallow(arena, Payload.DeclRefMut),
@@ -1803,9 +1803,10 @@ pub const Value = extern union {
pub fn pointerDecl(val: Value) ?*Module.Decl {
return switch (val.tag()) {
.decl_ref_mut => val.castTag(.decl_ref_mut).?.data.decl,
.extern_fn, .decl_ref => val.cast(Payload.Decl).?.data,
.extern_fn => val.castTag(.extern_fn).?.data.owner_decl,
.function => val.castTag(.function).?.data.owner_decl,
.variable => val.castTag(.variable).?.data.owner_decl,
.decl_ref => val.cast(Payload.Decl).?.data,
else => null,
};
}
@@ -1872,9 +1873,10 @@ pub const Value = extern union {
pub fn markReferencedDeclsAlive(val: Value) void {
switch (val.tag()) {
.decl_ref_mut => return val.castTag(.decl_ref_mut).?.data.decl.markAlive(),
.extern_fn, .decl_ref => return val.cast(Payload.Decl).?.data.markAlive(),
.extern_fn => return val.castTag(.extern_fn).?.data.owner_decl.markAlive(),
.function => return val.castTag(.function).?.data.owner_decl.markAlive(),
.variable => return val.castTag(.variable).?.data.owner_decl.markAlive(),
.decl_ref => return val.cast(Payload.Decl).?.data.markAlive(),
.repeated,
.eu_payload,
@@ -3148,6 +3150,11 @@ pub const Value = extern union {
data: *Module.Fn,
};
pub const ExternFn = struct {
base: Payload,
data: *Module.ExternFn,
};
pub const Decl = struct {
base: Payload,
data: *Module.Decl,