riki/rkgk
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fix incorrect implementation of .jump and .jump_if_not that could cause a server crash

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りき萌 2025-06-28 09:38:31 +02:00
parent 0ddc42c00f
commit 12101bc6e1
2 changed files with 18 additions and 8 deletions
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8
crates/haku2/src/value.zig
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@ -146,8 +146,12 @@ pub const Closure = struct {
param_count: u8,
impl: Impl,
pub fn bytecodePtr(c: *const Closure, pc: usize) [*]const u8 {
return c.impl.bytecode.chunk.bytecode[c.impl.bytecode.start + pc ..].ptr;
pub fn globalBytecodePtr(c: *const Closure, pc: usize) [*]const u8 {
return c.impl.bytecode.chunk.bytecode[pc..].ptr;
}
pub fn relBytecodePtr(c: *const Closure, pc: usize) [*]const u8 {
return c.globalBytecodePtr(c.impl.bytecode.start + pc);
}
pub fn programCounter(c: *const Closure, ip: [*]const u8) u16 {

18
crates/haku2/src/vm.zig
View file

@ -266,8 +266,10 @@ pub fn run(
// system functions should be able to call themselves (like: map (range 1 10) sin)
debug.assert(init_closure.impl == .bytecode);
log.debug("BYTECODE {any}", .{init_closure.impl.bytecode.chunk.bytecode});
var closure = init_closure;
var ip: [*]const u8 = closure.bytecodePtr(0);
var ip: [*]const u8 = closure.relBytecodePtr(0);
var bottom = init_bottom;
var fuel = vm.fuel;
@ -391,7 +393,7 @@ pub fn run(
const name = ip[0..name_len];
ip += name_len;
const body = ip;
ip = closure.bytecodePtr(then);
ip = closure.globalBytecodePtr(then);
const local_count = read(u8, &ip);
const capture_count = read(u8, &ip);
@ -418,7 +420,7 @@ pub fn run(
.param_count = param_count,
.impl = .{ .bytecode = .{
.chunk = closure.impl.bytecode.chunk,
.start = @truncate(body - closure.bytecodePtr(0)),
.start = @truncate(body - closure.relBytecodePtr(0)),
.local_count = local_count,
.captures = captures,
} },
@ -433,7 +435,8 @@ pub fn run(
.jump => {
const offset = read(u16, &ip);
try vm.consumeFuel(&fuel, 1);
ip = closure.bytecodePtr(offset);
log.debug("JUMP {}", .{offset});
ip = closure.globalBytecodePtr(offset);
continue :next vm.readOpcode(&ip);
},
@ -442,7 +445,10 @@ pub fn run(
try vm.consumeFuel(&fuel, 1);
const condition = try vm.pop();
if (!condition.isTruthy()) {
ip = closure.bytecodePtr(offset);
log.debug("CJUMP {} JUMPED", .{offset});
ip = closure.globalBytecodePtr(offset);
} else {
log.debug("CJUMP {} SKIPPED", .{offset});
}
continue :next vm.readOpcode(&ip);
},
@ -508,7 +514,7 @@ pub fn run(
try vm.validateBytecode(overflow == 0, "not enough values on the stack for arguments", .{});
closure = called_closure;
ip = closure.bytecodePtr(0);
ip = closure.relBytecodePtr(0);
bottom = new_bottom;
// pushCall before setting vm.closure and vm.ip, such that stack overflow errors are