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vm: add debug flags

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This commit is contained in:
Luna 2019-06-01 15:01:39 -03:00
parent dae3c259fd
commit 456bc95138
2 changed files with 21 additions and 7 deletions
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6
src/main.zig
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@ -118,11 +118,7 @@ pub fn main() !void {
var constant = try chk.writeConstant(1.2, 123);
try chk.write(chunk.OpCode.Return, 123);
try chk.disassemble(stdout, "test chunk");
var vmach = vm.VM.init(stdout, &chk);
std.debug.warn("vm start\n");
var vmach = vm.VM.init(stdout, &chk, true);
_ = try vmach.interpret();
std.debug.warn("vm end\n");
}

22
src/vm.zig
View file

@ -15,15 +15,23 @@ pub const VM = struct {
chk: *Chunk,
ip: usize,
stdout: StdOut,
debug_flag: bool,
pub fn init(stdout: StdOut, chk: *Chunk) VM {
pub fn init(stdout: StdOut, chk: *Chunk, debug_flag: bool) VM {
return VM{
.stdout = stdout,
.chk = chk,
.ip = 0,
.debug_flag = debug_flag,
};
}
pub fn debug(self: *VM, comptime fmt: []const u8, args: ...) void {
if (self.debug_flag) {
std.debug.warn(fmt, args);
}
}
fn readByte(self: *VM) u8 {
var byte: u8 = self.chk.code[self.ip];
self.ip += 1;
@ -47,17 +55,23 @@ pub const VM = struct {
fn run(self: *VM) !InterpretResult {
while (true) {
if (self.debug_flag) {
_ = try self.chk.disassembleInstruction(self.stdout, self.ip);
}
var instruction = self.readByte();
switch (instruction) {
chunk.OpCode.Constant => blk: {
var constant = self.readConst();
try value.printValue(self.stdout, constant);
try self.stdout.write("\n");
break :blk;
},
chunk.OpCode.ConstantLong => blk: {
var constant = self.readConstLong();
try value.printValue(self.stdout, constant);
try self.stdout.write("\n");
break :blk;
},
chunk.OpCode.Return => blk: {
@ -73,6 +87,10 @@ pub const VM = struct {
pub fn interpret(self: *VM) !InterpretResult {
self.ip = 0;
return try self.run();
self.debug("VM start\n");
var res = try self.run();
self.debug("VM end\n");
return res;
}
};