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fix stack peek/poke, tests, improve debugging via colors

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This commit is contained in:
Jeeves 2025-03-04 23:17:45 -07:00
parent 5d3c733921
commit 24f5fd49fa
1 changed files with 47 additions and 28 deletions
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75
src/uxn.zig
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@ -40,11 +40,42 @@ const Memory = struct {
}
};
test "memory peek/poke" {
var mem = Memory{ .m = undefined };
mem.poke(u16, 0, 0xABCD);
mem.poke(u8, 2, 0x69);
try std.testing.expectEqual(0xABCD, mem.peek(u16, 0));
try std.testing.expectEqual(0x69, mem.peek(u8, 2));
}
const Stack = struct {
s: [0x100]u8,
sp: u8 = 0,
pub fn peek(self: *Stack, comptime T: type) T {
std.debug.print("\x1b[1;32mstack peek:\x1b[0m sp {d}, type {s}\n", .{ self.sp, @typeName(T) });
return switch (T) {
u8 => self.s[self.sp -% 1],
u16 => @as(u16, @intCast(self.s[self.sp -% 2])) << 8 | self.s[self.sp -% 1],
else => @compileError("expected u8 or u16, got " + @typeName(T)),
};
}
pub fn poke(self: *Stack, comptime T: type, v: T) void {
std.debug.print("\x1b[1;32mstack poke:\x1b[0m sp {d}, type {s}\n", .{ self.sp, @typeName(T) });
switch (T) {
u8 => self.s[self.sp -% 1] = v,
u16 => {
self.s[self.sp -% 2] = @truncate(v >> 8);
self.s[self.sp -% 1] = @truncate(v & 0xFF);
},
else => @compileError("expected u8 or u16, got " + @typeName(T)),
}
}
pub fn pop(self: *Stack, comptime T: type) T {
self.sp -%= @intCast(@divExact(@typeInfo(T).int.bits, 8));
std.debug.print("\x1b[1;32mstack pop:\x1b[0m sp {d}, type {s}\n", .{ self.sp, @typeName(T) });
return switch (T) {
u8 => self.s[self.sp],
u16 => @as(u16, @intCast(self.s[self.sp])) << 8 | self.s[self.sp +% 1],
@ -52,7 +83,8 @@ const Stack = struct {
};
}
pub fn poke(self: *Stack, comptime T: type, v: T) void {
pub fn push(self: *Stack, comptime T: type, v: T) void {
std.debug.print("\x1b[1;32mstack push:\x1b[0m sp {d}, type {s}\n", .{ self.sp, @typeName(T) });
switch (T) {
u8 => self.s[self.sp] = v,
u16 => {
@ -61,19 +93,24 @@ const Stack = struct {
},
else => @compileError("expected u8 or u16, got " + @typeName(T)),
}
}
pub fn pop(self: *Stack, comptime T: type) T {
self.sp -%= @intCast(@divExact(@typeInfo(T).int.bits, 8));
return self.peek(T);
}
pub fn push(self: *Stack, comptime T: type, v: T) void {
self.poke(T, v);
self.sp +%= @intCast(@divExact(@typeInfo(T).int.bits, 8));
}
};
test "stack poke/peek/push/pop" {
var stack = Stack{ .s = undefined };
stack.push(u16, 0xABCD);
stack.push(u8, 0x69);
try std.testing.expectEqual(0x69, stack.peek(u8));
try std.testing.expectEqual(0x69, stack.pop(u8));
try std.testing.expectEqual(0xABCD, stack.peek(u16));
try std.testing.expectEqual(0xABCD, stack.pop(u16));
stack.poke(u8, 0xBF);
try std.testing.expectEqual(0xBF, stack.peek(u8));
stack.poke(u16, 0xBEEF);
try std.testing.expectEqual(0xBEEF, stack.peek(u16));
}
pub fn eval(self: *Uxn) bool {
switch (self.mem.m[self.pc]) {
0x00 => return true, // BRK
@ -603,24 +640,6 @@ fn sft(stack: *Stack, comptime T: type, comptime keep: bool) void {
}
}
// TODO move the mem/stack to just below their respective definitions
test "memory peek/poke" {
var mem = Memory{ .m = undefined };
mem.poke(u16, 0, 0xABCD);
mem.poke(u8, 2, 0xAA);
try std.testing.expectEqual(0xABCD, mem.peek(u16, 0));
try std.testing.expectEqual(0xAA, mem.peek(u8, 2));
}
test "stack push/pop" {
var stack = Stack{ .s = undefined };
stack.push(u16, 0xABCD);
stack.push(u8, 0xAA);
try std.testing.expectEqual(0xAA, stack.pop(u8));
try std.testing.expectEqual(0xABCD, stack.pop(u16));
}
// test "arithmetic instructions" {
// var uxn = Uxn{
// .mem = .{ .m = undefined },