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//! Patch's predicate synthesizer
// Copyright (C) 2025 Nguyễn Gia Phong
//
// This file is part of taosc.
//
// Taosc is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Taosc is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with taosc. If not, see <https://www.gnu.org/licenses/>.
const Allocator = std.mem.Allocator;
const ArenaAllocator = std.heap.ArenaAllocator;
const CompareOperator = std.math.CompareOperator;
const Writer = std.io.Writer;
const argsAlloc = std.process.argsAlloc;
const argsFree = std.process.argsFree;
const assert = std.debug.assert;
const compare = std.math.compare;
const divTrunc = std.math.divTrunc;
const exit = std.process.exit;
const page_allocator = std.heap.page_allocator;
const parseUnsigned = std.fmt.parseUnsigned;
const print = std.debug.print;
const rem = std.math.rem;
const shl = std.math.shl;
const shr = std.math.shr;
const std = @import("std");
const stdout = std.fs.File.stdout;
const tags = std.meta.tags;
const Register = Variables.Register;
const RegisterEnum = Variables.RegisterEnum;
const Variables = @import("Variables.zig");
const signed_integers = Variables.signed_integers;
comptime {
_ = Variables; // for test discovery
}
const UnaryOperator = enum {
@"+",
@"-",
@"~",
fn apply(op: UnaryOperator, val: Register) Register {
return switch (op) {
.@"+" => val,
.@"-" => -%val,
.@"~" => ~val,
};
}
};
const Unary = struct {
op: UnaryOperator,
val: Variables.Query,
pub fn format(un: Unary, writer: *Writer) Writer.Error!void {
try writer.print("{s}{f}", .{ @tagName(un.op), un.val });
}
};
const ArithmeticOperator = enum {
@"+", @"-", @"*", @"/", @"%",
@"&", @"|", @"^", @"<<", @">>",
fn apply(op: ArithmeticOperator, lhs: Register, rhs: Register) !Register {
return switch (op) {
.@"+" => lhs +% rhs,
.@"-" => lhs -% rhs,
.@"*" => lhs *% rhs,
.@"/" => try divTrunc(Register, lhs, rhs),
.@"%" => try rem(Register, lhs, rhs),
.@"&" => lhs & rhs,
.@"|" => lhs | rhs,
.@"^" => lhs ^ rhs,
.@"<<" => shl(Register, lhs, rhs),
.@">>" => shr(Register, lhs, rhs),
};
}
};
const Arithmetic = struct {
lhs: Variables.Query,
op: ArithmeticOperator,
rhs: Variables.Query,
pub fn format(arith: Arithmetic, writer: *Writer) Writer.Error!void {
try writer.print("{f} {s} {f}", .{
arith.lhs,
@tagName(arith.op),
arith.rhs,
});
}
};
const Comparison = struct {
lhs: Arithmetic,
op: CompareOperator,
rhs: Unary,
fn check(cmp: Comparison, vars: Variables, expected: bool,
tmp: Temporaries) !bool {
for (try vars.get(cmp.lhs.lhs, tmp[0]),
try vars.get(cmp.lhs.rhs, tmp[1]),
try vars.get(cmp.rhs.val, tmp[2])) |v0, v1, v2| {
const arith = cmp.lhs.op.apply(v0, v1) catch return false;
const actual = compare(arith, cmp.op, cmp.rhs.op.apply(v2));
if (if (expected) !actual else actual)
return false;
}
return true;
}
pub fn format(cmp: Comparison, writer: *Writer) Writer.Error!void {
try writer.print("{f} {s} {f}", .{
cmp.lhs,
switch (cmp.op) {
.lt => "<",
.lte => "<=",
.eq => "==",
.gte => ">=",
.gt => ">",
.neq => "!=",
},
cmp.rhs,
});
}
};
const Temporaries = [3][]Register;
fn process(writer: *Writer, bot: Variables, top: Variables,
bot_tmp: Temporaries, top_tmp: Temporaries,
v0: Variables.Query, arith: ArithmeticOperator,
v1: Variables.Query, cmp: CompareOperator,
unary: UnaryOperator, v2: Variables.Query) !void {
const predicate = Comparison{
.lhs = .{ .lhs = v0, .op = arith, .rhs = v1 },
.op = cmp,
.rhs = .{ .op = unary, .val = v2 },
};
if (try predicate.check(bot, false, bot_tmp))
return;
if (try predicate.check(top, true, top_tmp))
return;
try writer.print("{f}\n", .{ predicate });
}
fn mineOperator(writer: *Writer, bot: Variables, top: Variables,
bot_tmp: Temporaries, top_tmp: Temporaries,
v0: Variables.Query, v1: Variables.Query,
v2: Variables.Query) !void {
for (tags(ArithmeticOperator)) |arith|
for (tags(UnaryOperator)) |unary|
for (tags(CompareOperator)) |cmp|
try process(writer, bot, top, bot_tmp, top_tmp,
v0, arith, v1, cmp, unary, v2);
}
fn alloc_tmp(allocator: Allocator, len: usize) Allocator.Error!Temporaries {
var tmp = [_][]Register{ &.{} } ** 3;
errdefer free_tmp(allocator, tmp);
for (&tmp) |*variable|
variable.* = try allocator.alloc(Register, len);
return tmp;
}
fn free_tmp(allocator: Allocator, tmp: Temporaries) void {
for (tmp) |variable|
allocator.free(variable);
}
fn mine(allocator: Allocator, writer: *Writer,
bot: Variables, top: Variables) !void {
const bot_tmp = try alloc_tmp(allocator, bot.samples);
defer free_tmp(allocator, bot_tmp);
const top_tmp = try alloc_tmp(allocator, top.samples);
defer free_tmp(allocator, top_tmp);
const variables = try Variables.allQueries(allocator);
defer allocator.free(variables);
inline for (comptime Variables.constantQueries()) |v2|
for (variables) |v0| for (variables) |v1| if (!v2.skip(v0, v1))
try mineOperator(writer, bot, top, bot_tmp, top_tmp, v0, v1, v2);
try writer.flush();
}
pub fn main() !void {
var buffer: [80]u8 = undefined;
var writer = stdout().writer(&buffer);
var arena = ArenaAllocator.init(page_allocator);
defer arena.deinit();
const allocator = arena.allocator();
const args = try argsAlloc(allocator);
defer argsFree(allocator, args);
if (args.len != 4) {
try writer.interface.print("Usage: taosc-synth {s} {s} {s}\n", .{
"STACK_SIZE", "BOTTOM_DIR", "TOP_DIR",
});
try writer.interface.flush();
exit(1);
}
const stack_size = try parseUnsigned(usize, args[1], 0);
inline for (signed_integers) |SignedInt|
assert(stack_size % @sizeOf(SignedInt) == 0);
const bot = try Variables.init(allocator, stack_size, args[2]);
defer bot.deinit(allocator);
const top = try Variables.init(allocator, stack_size, args[3]);
defer top.deinit(allocator);
try mine(allocator, &writer.interface, bot, top);
}
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