Line information
parent
975280be8f
commit
0f891e4275
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@ -10,6 +10,7 @@ pub const OpCode = enum(u8) {
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pub const Chunk = struct {
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code: []u8,
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lines: []u32,
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count: usize,
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capacity: usize,
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constants: ValueArray,
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@ -22,30 +23,26 @@ pub const Chunk = struct {
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.capacity = 0,
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.allocator = allocator,
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.code = try allocator.alloc(u8, 0),
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.lines = try allocator.alloc(u32, 0),
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.constants = try ValueArray.init(allocator),
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};
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}
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/// Writes a byte to this chunk
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pub fn write(self: *Chunk, byte: u8) !void {
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pub fn write(self: *Chunk, byte: u8, line: u32) !void {
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// If the code slice is full
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if (self.count == self.capacity) {
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const old_capacity = self.capacity;
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self.capacity = grow_capacity(old_capacity);
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self.code = try self.allocator.realloc(self.code, self.capacity);
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self.lines = try self.allocator.realloc(self.lines, self.capacity);
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}
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self.code[self.count] = byte;
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self.lines[self.count] = line;
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self.count += 1;
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}
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/// Reinitializes the state of the chunk.
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pub fn free_chunck(self: *Chunk) !void {
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self.count = 0;
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self.capacity = 0;
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self.code = try self.allocator.realloc(self.code, 0);
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}
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/// Prints the current state of the chunk to stderr
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pub fn dissasemble_chunk(self: *Chunk, name: []const u8) void {
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print("== {s} ==\n", .{name});
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@ -60,6 +57,13 @@ pub const Chunk = struct {
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fn dissasemble_instruction(self: *Chunk, offset: usize) usize {
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print("{d:0>4} ", .{offset});
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// Print the line number
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if (offset > 0 and self.lines[offset] == self.lines[offset - 1]) {
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print(" | ", .{});
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} else {
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print("{d: >4} ", .{self.lines[offset]});
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}
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const instruction = self.code[offset];
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switch (instruction) {
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@intFromEnum(OpCode.OP_RETURN) => return simple_instruction("OP_RETURN", offset),
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@ -78,15 +82,17 @@ pub const Chunk = struct {
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/// Destroys this chunk
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pub fn deinit(self: Chunk) void {
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self.allocator.free(self.code);
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self.allocator.free(self.lines);
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self.constants.deinit();
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}
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fn constant_instruction(self: *Chunk, comptime name: []const u8, offset: usize) usize {
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const constant_addr = self.code[offset + 1];
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const constant_value = self.constants.values[constant_addr];
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print("{s} ", .{name});
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print("{s: <16} {d: >4} '", .{ name, constant_addr });
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print_value(constant_value);
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print("\n", .{});
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print("'\n", .{});
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return offset + 2;
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}
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};
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17
src/main.zig
17
src/main.zig
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@ -12,11 +12,11 @@ pub fn main() !void {
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var c = try chunk.Chunk.init(alloc);
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defer c.deinit();
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try c.write(@intFromEnum(chunk.OpCode.OP_RETURN));
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const constant_idx = try c.add_constant(1.2);
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try c.write(@intFromEnum(OpCode.OP_CONSTANT));
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try c.write(@truncate(constant_idx));
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try c.write(@intFromEnum(OpCode.OP_CONSTANT), 1);
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try c.write(@truncate(constant_idx), 1);
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try c.write(@intFromEnum(chunk.OpCode.OP_RETURN), 1);
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c.dissasemble_chunk("test chunk");
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}
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@ -25,9 +25,8 @@ test "chunk test" {
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var c = try chunk.Chunk.init(std.testing.allocator);
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defer c.deinit();
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try c.write('a');
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try c.write('b');
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try c.free_chunck();
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try c.write('J');
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try c.write('H');
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try c.write('a', 0);
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try c.write('b', 1);
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try c.write('J', 2);
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try c.write('H', 3);
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}
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