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stage2: astgen for loops

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Vexu 2020-08-25 19:22:00 +03:00 committed by Andrew Kelley
parent 7d0bb0774e
commit b1aa2857ff
2 changed files with 212 additions and 13 deletions
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189
src-self-hosted/astgen.zig
View File

@ -273,6 +273,7 @@ pub fn expr(mod: *Module, scope: *Scope, rl: ResultLoc, node: *ast.Node) InnerEr
.AnyFrameType => return rlWrap(mod, scope, rl, try anyFrameType(mod, scope, node.castTag(.AnyFrameType).?)),
.ErrorSetDecl => return errorSetDecl(mod, scope, rl, node.castTag(.ErrorSetDecl).?),
.ErrorType => return rlWrap(mod, scope, rl, try errorType(mod, scope, node.castTag(.ErrorType).?)),
.For => return forExpr(mod, scope, rl, node.castTag(.For).?),
.Defer => return mod.failNode(scope, node, "TODO implement astgen.expr for .Defer", .{}),
.Catch => return mod.failNode(scope, node, "TODO implement astgen.expr for .Catch", .{}),
@ -288,7 +289,6 @@ pub fn expr(mod: *Module, scope: *Scope, rl: ResultLoc, node: *ast.Node) InnerEr
.StructInitializer => return mod.failNode(scope, node, "TODO implement astgen.expr for .StructInitializer", .{}),
.StructInitializerDot => return mod.failNode(scope, node, "TODO implement astgen.expr for .StructInitializerDot", .{}),
.Switch => return mod.failNode(scope, node, "TODO implement astgen.expr for .Switch", .{}),
.For => return mod.failNode(scope, node, "TODO implement astgen.expr for .For", .{}),
.Suspend => return mod.failNode(scope, node, "TODO implement astgen.expr for .Suspend", .{}),
.Continue => return mod.failNode(scope, node, "TODO implement astgen.expr for .Continue", .{}),
.AnyType => return mod.failNode(scope, node, "TODO implement astgen.expr for .AnyType", .{}),
@ -497,7 +497,7 @@ fn varDecl(
const var_data: struct { result_loc: ResultLoc, alloc: *zir.Inst } = if (node.getTrailer("type_node")) |type_node| a: {
const type_inst = try typeExpr(mod, scope, type_node);
const alloc = try addZIRUnOp(mod, scope, name_src, .alloc, type_inst);
break :a .{ .alloc = try addZIRUnOp(mod, scope, name_src, .alloc, type_inst), .result_loc = .{ .ptr = alloc } };
break :a .{ .alloc = alloc, .result_loc = .{ .ptr = alloc } };
} else a: {
const alloc = try addZIRNoOp(mod, scope, name_src, .alloc_inferred);
break :a .{ .alloc = alloc, .result_loc = .{ .inferred_ptr = alloc.castTag(.alloc_inferred).? } };
@ -624,7 +624,7 @@ fn ptrSliceType(mod: *Module, scope: *Scope, src: usize, ptr_info: *ast.PtrInfo,
.One => if (mutable) T.single_mut_ptr_type else T.single_const_ptr_type,
.Many => if (mutable) T.many_mut_ptr_type else T.many_const_ptr_type,
.C => if (mutable) T.c_mut_ptr_type else T.c_const_ptr_type,
.Slice => if (mutable) T.mut_slice_type else T.mut_slice_type,
.Slice => if (mutable) T.mut_slice_type else T.const_slice_type,
}, child_type);
}
@ -794,9 +794,7 @@ fn field(mod: *Module, scope: *Scope, rl: ResultLoc, node: *ast.Node.SimpleInfix
const lhs = try expr(mod, scope, .ref, node.lhs);
const field_name = try identifierStringInst(mod, scope, node.rhs.castTag(.Identifier).?);
const pointer = try addZIRInst(mod, scope, src, zir.Inst.FieldPtr, .{ .object_ptr = lhs, .field_name = field_name }, .{});
if (rl == .ref) return pointer;
return rlWrap(mod, scope, rl, try addZIRUnOp(mod, scope, src, .deref, pointer));
return rlWrapPtr(mod, scope, rl, try addZIRInst(mod, scope, src, zir.Inst.FieldPtr, .{ .object_ptr = lhs, .field_name = field_name }, .{}));
}
fn deref(mod: *Module, scope: *Scope, node: *ast.Node.SimpleSuffixOp) InnerError!*zir.Inst {
@ -1080,6 +1078,12 @@ fn whileExpr(mod: *Module, scope: *Scope, rl: ResultLoc, while_node: *ast.Node.W
}
}
if (while_node.label) |tok|
return mod.failTok(scope, tok, "TODO labeled while", .{});
if (while_node.inline_token) |tok|
return mod.failTok(scope, tok, "TODO inline while", .{});
var expr_scope: Scope.GenZIR = .{
.parent = scope,
.decl = scope.decl().?,
@ -1198,6 +1202,179 @@ fn whileExpr(mod: *Module, scope: *Scope, rl: ResultLoc, while_node: *ast.Node.W
return &while_block.base;
}
fn forExpr(mod: *Module, scope: *Scope, rl: ResultLoc, for_node: *ast.Node.For) InnerError!*zir.Inst {
if (for_node.label) |tok|
return mod.failTok(scope, tok, "TODO labeled for", .{});
if (for_node.inline_token) |tok|
return mod.failTok(scope, tok, "TODO inline for", .{});
var for_scope: Scope.GenZIR = .{
.parent = scope,
.decl = scope.decl().?,
.arena = scope.arena(),
.instructions = .{},
};
defer for_scope.instructions.deinit(mod.gpa);
// setup variables and constants
const tree = scope.tree();
const for_src = tree.token_locs[for_node.for_token].start;
const index_ptr = blk: {
const usize_type = try addZIRInstConst(mod, &for_scope.base, for_src, .{
.ty = Type.initTag(.type),
.val = Value.initTag(.usize_type),
});
const index_ptr = try addZIRUnOp(mod, &for_scope.base, for_src, .alloc, usize_type);
// initialize to zero
const zero = try addZIRInstConst(mod, &for_scope.base, for_src, .{
.ty = Type.initTag(.usize),
.val = Value.initTag(.zero),
});
_ = try addZIRBinOp(mod, &for_scope.base, for_src, .store, index_ptr, zero);
break :blk index_ptr;
};
const array_ptr = try expr(mod, &for_scope.base, .ref, for_node.array_expr);
const cond_src = tree.token_locs[for_node.array_expr.firstToken()].start;
const len_ptr = try addZIRInst(mod, &for_scope.base, cond_src, zir.Inst.FieldPtr, .{
.object_ptr = array_ptr,
.field_name = try addZIRInst(mod, &for_scope.base, cond_src, zir.Inst.Str, .{ .bytes = "len" }, .{}),
}, .{});
var loop_scope: Scope.GenZIR = .{
.parent = &for_scope.base,
.decl = for_scope.decl,
.arena = for_scope.arena,
.instructions = .{},
};
defer loop_scope.instructions.deinit(mod.gpa);
var cond_scope: Scope.GenZIR = .{
.parent = &loop_scope.base,
.decl = loop_scope.decl,
.arena = loop_scope.arena,
.instructions = .{},
};
defer cond_scope.instructions.deinit(mod.gpa);
// check condition i < array_expr.len
const index = try addZIRUnOp(mod, &cond_scope.base, cond_src, .deref, index_ptr);
const len = try addZIRUnOp(mod, &cond_scope.base, cond_src, .deref, len_ptr);
const cond = try addZIRBinOp(mod, &cond_scope.base, cond_src, .cmp_lt, index, len);
const condbr = try addZIRInstSpecial(mod, &cond_scope.base, for_src, zir.Inst.CondBr, .{
.condition = cond,
.then_body = undefined, // populated below
.else_body = undefined, // populated below
}, .{});
const cond_block = try addZIRInstBlock(mod, &loop_scope.base, for_src, .{
.instructions = try loop_scope.arena.dupe(*zir.Inst, cond_scope.instructions.items),
});
// increment index variable
const one = try addZIRInstConst(mod, &loop_scope.base, for_src, .{
.ty = Type.initTag(.usize),
.val = Value.initTag(.one),
});
const index_plus_one = try addZIRBinOp(mod, &loop_scope.base, for_src, .add, index, one);
_ = try addZIRBinOp(mod, &loop_scope.base, for_src, .store, index_ptr, index_plus_one);
// looping stuff
const loop = try addZIRInstLoop(mod, &for_scope.base, for_src, .{
.instructions = try for_scope.arena.dupe(*zir.Inst, loop_scope.instructions.items),
});
const for_block = try addZIRInstBlock(mod, scope, for_src, .{
.instructions = try scope.arena().dupe(*zir.Inst, for_scope.instructions.items),
});
// while body
const then_src = tree.token_locs[for_node.body.lastToken()].start;
var then_scope: Scope.GenZIR = .{
.parent = &cond_scope.base,
.decl = cond_scope.decl,
.arena = cond_scope.arena,
.instructions = .{},
};
defer then_scope.instructions.deinit(mod.gpa);
// Most result location types can be forwarded directly; however
// if we need to write to a pointer which has an inferred type,
// proper type inference requires peer type resolution on the while's
// branches.
const branch_rl: ResultLoc = switch (rl) {
.discard, .none, .ty, .ptr, .ref => rl,
.inferred_ptr, .bitcasted_ptr, .block_ptr => .{ .block_ptr = for_block },
};
var index_scope: Scope.LocalPtr = undefined;
const then_sub_scope = blk: {
const payload = for_node.payload.castTag(.PointerIndexPayload).?;
const is_ptr = payload.ptr_token != null;
const value_name = tree.tokenSlice(payload.value_symbol.firstToken());
if (!mem.eql(u8, value_name, "_")) {
return mod.failNode(&then_scope.base, payload.value_symbol, "TODO implement for value payload", .{});
} else if (is_ptr) {
return mod.failTok(&then_scope.base, payload.ptr_token.?, "pointer modifier invalid on discard", .{});
}
const index_symbol_node = payload.index_symbol orelse
break :blk &then_scope.base;
const index_name = tree.tokenSlice(index_symbol_node.firstToken());
if (mem.eql(u8, index_name, "_")) {
break :blk &then_scope.base;
}
// TODO ensure this is const
index_scope = .{
.parent = &then_scope.base,
.gen_zir = &then_scope,
.name = index_name,
.ptr = index_ptr,
};
break :blk &index_scope.base;
};
const then_result = try expr(mod, then_sub_scope, branch_rl, for_node.body);
if (!then_result.tag.isNoReturn()) {
_ = try addZIRInst(mod, then_sub_scope, then_src, zir.Inst.Break, .{
.block = cond_block,
.operand = then_result,
}, .{});
}
condbr.positionals.then_body = .{
.instructions = try then_scope.arena.dupe(*zir.Inst, then_scope.instructions.items),
};
// else branch
var else_scope: Scope.GenZIR = .{
.parent = &cond_scope.base,
.decl = cond_scope.decl,
.arena = cond_scope.arena,
.instructions = .{},
};
defer else_scope.instructions.deinit(mod.gpa);
if (for_node.@"else") |else_node| {
const else_src = tree.token_locs[else_node.body.lastToken()].start;
const else_result = try expr(mod, &else_scope.base, branch_rl, else_node.body);
if (!else_result.tag.isNoReturn()) {
_ = try addZIRInst(mod, &else_scope.base, else_src, zir.Inst.Break, .{
.block = for_block,
.operand = else_result,
}, .{});
}
} else {
const else_src = tree.token_locs[for_node.lastToken()].start;
_ = try addZIRInst(mod, &else_scope.base, else_src, zir.Inst.BreakVoid, .{
.block = for_block,
}, .{});
}
condbr.positionals.else_body = .{
.instructions = try else_scope.arena.dupe(*zir.Inst, else_scope.instructions.items),
};
return &for_block.base;
}
fn ret(mod: *Module, scope: *Scope, cfe: *ast.Node.ControlFlowExpression) InnerError!*zir.Inst {
const tree = scope.tree();
const src = tree.token_locs[cfe.ltoken].start;

36
src-self-hosted/value.zig
View File

@ -65,6 +65,7 @@ pub const Value = extern union {
undef,
zero,
one,
void_value,
unreachable_value,
empty_array,
@ -174,6 +175,7 @@ pub const Value = extern union {
.anyframe_type,
.undef,
.zero,
.one,
.void_value,
.unreachable_value,
.empty_array,
@ -313,6 +315,7 @@ pub const Value = extern union {
.null_value => return out_stream.writeAll("null"),
.undef => return out_stream.writeAll("undefined"),
.zero => return out_stream.writeAll("0"),
.one => return out_stream.writeAll("1"),
.void_value => return out_stream.writeAll("{}"),
.unreachable_value => return out_stream.writeAll("unreachable"),
.bool_true => return out_stream.writeAll("true"),
@ -447,6 +450,7 @@ pub const Value = extern union {
.undef,
.zero,
.one,
.void_value,
.unreachable_value,
.empty_array,
@ -546,7 +550,9 @@ pub const Value = extern union {
.bool_false,
=> return BigIntMutable.init(&space.limbs, 0).toConst(),
.bool_true => return BigIntMutable.init(&space.limbs, 1).toConst(),
.one,
.bool_true,
=> return BigIntMutable.init(&space.limbs, 1).toConst(),
.int_u64 => return BigIntMutable.init(&space.limbs, self.cast(Payload.Int_u64).?.int).toConst(),
.int_i64 => return BigIntMutable.init(&space.limbs, self.cast(Payload.Int_i64).?.int).toConst(),
@ -627,7 +633,9 @@ pub const Value = extern union {
.bool_false,
=> return 0,
.bool_true => return 1,
.one,
.bool_true,
=> return 1,
.int_u64 => return self.cast(Payload.Int_u64).?.int,
.int_i64 => return @intCast(u64, self.cast(Payload.Int_i64).?.int),
@ -708,7 +716,9 @@ pub const Value = extern union {
.bool_false,
=> return 0,
.bool_true => return 1,
.one,
.bool_true,
=> return 1,
.int_u64 => return @intCast(i64, self.cast(Payload.Int_u64).?.int),
.int_i64 => return self.cast(Payload.Int_i64).?.int,
@ -734,6 +744,7 @@ pub const Value = extern union {
.float_128 => @floatCast(T, self.cast(Payload.Float_128).?.val),
.zero => 0,
.one => 1,
.int_u64 => @intToFloat(T, self.cast(Payload.Int_u64).?.int),
.int_i64 => @intToFloat(T, self.cast(Payload.Int_i64).?.int),
@ -814,7 +825,9 @@ pub const Value = extern union {
.bool_false,
=> return 0,
.bool_true => return 1,
.one,
.bool_true,
=> return 1,
.int_u64 => {
const x = self.cast(Payload.Int_u64).?.int;
@ -900,7 +913,9 @@ pub const Value = extern union {
.bool_false,
=> return true,
.bool_true => {
.one,
.bool_true,
=> {
const info = ty.intInfo(target);
if (info.signed) {
return info.bits >= 2;
@ -1064,7 +1079,9 @@ pub const Value = extern union {
.@"error",
=> unreachable,
.zero => false,
.zero,
.one,
=> false,
.float_16 => @rem(self.cast(Payload.Float_16).?.val, 1) != 0,
.float_32 => @rem(self.cast(Payload.Float_32).?.val, 1) != 0,
@ -1140,7 +1157,9 @@ pub const Value = extern union {
.bool_false,
=> .eq,
.bool_true => .gt,
.one,
.bool_true,
=> .gt,
.int_u64 => std.math.order(lhs.cast(Payload.Int_u64).?.int, 0),
.int_i64 => std.math.order(lhs.cast(Payload.Int_i64).?.int, 0),
@ -1257,6 +1276,7 @@ pub const Value = extern union {
.enum_literal_type,
.anyframe_type,
.zero,
.one,
.bool_true,
.bool_false,
.null_value,
@ -1339,6 +1359,7 @@ pub const Value = extern union {
.enum_literal_type,
.anyframe_type,
.zero,
.one,
.bool_true,
.bool_false,
.null_value,
@ -1438,6 +1459,7 @@ pub const Value = extern union {
.enum_literal_type,
.anyframe_type,
.zero,
.one,
.empty_array,
.bool_true,
.bool_false,