base code
This commit is contained in:
Lorenzo Torres
parent
fc39b27715
commit
4f45899a3c
197 changed files with 151568 additions and 2 deletions
559
src/vm/vm.zig
Normal file
559
src/vm/vm.zig
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@ -0,0 +1,559 @@
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const std = @import("std");
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const wasm = @import("wasm.zig");
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const Parser = @import("parse.zig");
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const Allocator = std.mem.Allocator;
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const AllocationError = error{OutOfMemory};
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pub fn leb128Decode(comptime T: type, bytes: []u8) struct { len: usize, val: T } {
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switch (@typeInfo(T)) {
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.int => {},
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else => @compileError("LEB128 integer decoding only support integers, but got " ++ @typeName(T)),
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}
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if (@typeInfo(T).int.bits != 32 and @typeInfo(T).int.bits != 64) {
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@compileError("LEB128 integer decoding only supports 32 or 64 bits integers but got " ++ std.fmt.comptimePrint("{d} bits", .{@typeInfo(T).int.bits}));
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}
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var result: T = 0;
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// TODO: is the type of shift important. Reading Wikipedia (not very much tho) it seems like we can use u32 and call it a day...
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var shift: if (@typeInfo(T).int.bits == 32) u5 else u6 = 0;
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var byte: u8 = undefined;
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var len: usize = 0;
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for (bytes) |b| {
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len += 1;
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result |= @as(T, @intCast((b & 0x7f))) << shift;
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if ((b & (0x1 << 7)) == 0) {
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byte = b;
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break;
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}
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shift += 7;
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}
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if (@typeInfo(T).int.signedness == .signed) {
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const size = @sizeOf(T) * 8;
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if (shift < size and (byte & 0x40) != 0) {
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result |= (~@as(T, 0) << shift);
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}
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}
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return .{ .len = len, .val = result };
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}
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pub fn decodeLittleEndian(comptime T: type, bytes: []u8) T {
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if (T != i32 and T != i64) {
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return @as(T, 0);
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} else {
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var value = @as(T, 0);
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for (0..@sizeOf(T)) |b| {
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value |= ((bytes[b]) << @intCast((@sizeOf(T) - b - 1)));
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}
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return value;
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}
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}
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pub fn encodeLittleEndian(comptime T: type, bytes: *[]u8, value: T) void {
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for (0..@sizeOf(T)) |b| {
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bytes.*[b] = @intCast(((value >> @intCast((@sizeOf(T) - b - 1))) & 0xff));
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}
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}
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pub const CallFrame = struct {
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program_counter: usize,
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code: []u8,
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locals: []Value,
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};
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const ValueType = enum {
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i32,
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i64,
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};
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pub const Value = union(ValueType) {
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i32: i32,
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i64: i64,
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};
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pub const Runtime = struct {
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module: Parser.Module,
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stack: std.ArrayList(Value),
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call_stack: std.ArrayList(CallFrame),
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memory: []u8,
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global_runtime: *wasm.GlobalRuntime,
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labels: std.ArrayList(usize),
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pub fn init(allocator: Allocator, module: Parser.Module, global_runtime: *wasm.GlobalRuntime) !Runtime {
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const memory = try allocator.alloc(u8, module.memory.max);
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return Runtime{
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.module = module,
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.stack = try std.ArrayList(Value).initCapacity(allocator, 10),
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.call_stack = try std.ArrayList(CallFrame).initCapacity(allocator, 5),
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.labels = try std.ArrayList(usize).initCapacity(allocator, 2),
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.memory = memory,
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.global_runtime = global_runtime,
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};
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}
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pub fn deinit(self: *Runtime, allocator: Allocator) void {
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self.module.deinit(allocator);
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self.stack.deinit();
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self.labels.deinit();
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self.call_stack.deinit();
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allocator.free(self.memory);
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}
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pub fn executeFrame(self: *Runtime, allocator: Allocator, frame: *CallFrame) !void {
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var for_loop = false;
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loop: while (true) {
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const byte: u8 = frame.code[frame.program_counter];
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frame.program_counter += 1;
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std.debug.print("b: {x}\n", .{byte});
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switch (byte) {
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0x03 => {
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try self.labels.append(frame.program_counter);
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frame.program_counter += 1;
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//const a = frame.code[frame.program_counter];
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for_loop = true;
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},
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0x0d => {
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const label = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += label.len;
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var address = @as(usize, 0);
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for (0..(label.val)) |_| {
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address = self.labels.pop().?;
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}
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if (self.stack.pop().?.i32 != 0) {
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frame.program_counter = address;
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}
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},
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0x20 => {
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const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += integer.len;
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try self.stack.append(frame.locals[integer.val]);
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},
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0x21 => {
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const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += integer.len;
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frame.locals[integer.val] = self.stack.pop().?;
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},
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0x22 => {
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const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += integer.len;
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frame.locals[integer.val] = self.stack.pop().?;
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try self.stack.append(Value{ .i32 = @intCast(integer.val) });
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},
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0x28 => {
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const address = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += address.len;
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const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += offset.len;
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const start = (address.val + offset.val);
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const end = start + @sizeOf(u32);
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try self.stack.append(Value{ .i32 = decodeLittleEndian(i32, self.memory[start..end]) });
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},
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0x29 => {
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const address = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += address.len;
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const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += offset.len;
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const start = (address.val + offset.val);
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const end = start + @sizeOf(u64);
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try self.stack.append(Value{ .i64 = decodeLittleEndian(i64, self.memory[start..end]) });
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},
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0x36 => {
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const address = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += address.len;
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const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += offset.len;
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const start = (address.val + offset.val);
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const end = start + @sizeOf(u32);
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try self.stack.append(Value{ .i32 = decodeLittleEndian(i32, self.memory[start..end]) });
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},
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0x37 => {
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const address = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += address.len;
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const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += offset.len;
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const start = (address.val + offset.val);
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const end = start + @sizeOf(u32);
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encodeLittleEndian(i32, @constCast(&self.memory[start..end]), self.stack.pop().?.i32);
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},
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0x38 => {
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const address = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += address.len;
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const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
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frame.program_counter += offset.len;
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const start = (address.val + offset.val);
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const end = start + @sizeOf(u64);
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encodeLittleEndian(i64, @constCast(&self.memory[start..end]), self.stack.pop().?.i64);
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},
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0x41 => {
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const integer = leb128Decode(i32, frame.code[frame.program_counter..]);
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frame.program_counter += integer.len;
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try self.stack.append(Value{ .i32 = integer.val });
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},
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0x42 => {
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const integer = leb128Decode(i64, frame.code[frame.program_counter..]);
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frame.program_counter += integer.len;
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try self.stack.append(Value{ .i64 = integer.val });
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},
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0x45 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 == 0))) });
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},
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0x46 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 == self.stack.pop().?.i32))) });
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},
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0x47 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 != self.stack.pop().?.i32))) });
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},
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0x48 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 < self.stack.pop().?.i32))) });
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},
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0x49 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) < @as(u32, @bitCast(self.stack.pop().?.i32))))) });
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},
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0x4a => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 > self.stack.pop().?.i32))) });
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},
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0x4b => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) > @as(u32, @bitCast(self.stack.pop().?.i32))))) });
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},
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0x4c => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 <= self.stack.pop().?.i32))) });
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},
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0x4d => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) <= @as(u32, @bitCast(self.stack.pop().?.i32))))) });
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},
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0x4e => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 >= self.stack.pop().?.i32))) });
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},
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0x4f => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) >= @as(u32, @bitCast(self.stack.pop().?.i32))))) });
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},
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0x50 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 == 0))) });
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},
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0x51 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 == self.stack.pop().?.i64))) });
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},
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0x52 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 != self.stack.pop().?.i64))) });
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},
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0x53 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 < self.stack.pop().?.i64))) });
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},
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0x54 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) < @as(u64, @bitCast(self.stack.pop().?.i64))))) });
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},
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0x55 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 > self.stack.pop().?.i64))) });
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},
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0x56 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) > @as(u64, @bitCast(self.stack.pop().?.i64))))) });
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},
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0x57 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 <= self.stack.pop().?.i64))) });
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},
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0x58 => {
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try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) <= @as(u64, @bitCast(self.stack.pop().?.i64))))) });
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},
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0x59 => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 >= self.stack.pop().?.i64))) });
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},
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0x5a => {
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try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) >= @as(u64, @bitCast(self.stack.pop().?.i64))))) });
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},
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0x67 => {
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var i = @as(i32, 0);
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const number = self.stack.pop().?.i32;
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for (0..@sizeOf(i32)) |b| {
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if (number & (@as(i32, 0x1) << @intCast((@sizeOf(i32) - b - 1))) == 1) {
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break;
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}
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i += 1;
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}
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try self.stack.append(Value{ .i32 = i });
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},
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0x68 => {
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var i = @as(i32, 0);
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const number = self.stack.pop().?.i32;
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for (0..@sizeOf(i32)) |b| {
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if (number & (@as(i32, 0x1) << @intCast(b)) == 1) {
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break;
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}
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i += 1;
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}
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try self.stack.append(Value{ .i32 = i });
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},
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0x69 => {
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var i = @as(i32, 0);
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const number = self.stack.pop().?.i32;
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for (0..@sizeOf(i32)) |b| {
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if (number & (@as(i32, 0x1) << @intCast(b)) == 1) {
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i += 1;
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}
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}
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try self.stack.append(Value{ .i32 = i });
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},
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0x6a => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 + b.i32 });
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},
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0x6b => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 - b.i32 });
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},
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0x6c => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 * b.i32 });
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},
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0x6d => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = @divTrunc(a.i32, b.i32) });
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},
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0x6e => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) / @as(u32, @bitCast(b.i32)))) });
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},
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0x6f => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = @rem(a.i32, b.i32) });
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},
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0x70 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) % @as(u32, @bitCast(b.i32)))) });
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},
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0x71 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 & b.i32 });
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},
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0x72 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 | b.i32 });
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},
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0x73 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 ^ b.i32 });
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},
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0x74 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 << @intCast(b.i32) });
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},
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0x75 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = a.i32 >> @intCast(b.i32) });
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},
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0x76 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) >> @intCast(@as(u32, @bitCast(b.i32))))) });
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},
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0x77 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = (a.i32 << @intCast(@as(u32, @bitCast(b.i32)))) | (a.i32 >> @intCast((@sizeOf(u32) * 8 - b.i32))) });
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},
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0x78 => {
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const a = self.stack.pop().?;
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const b = self.stack.pop().?;
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try self.stack.append(.{ .i32 = (a.i32 >> @intCast(@as(u32, @bitCast(b.i32)))) | (a.i32 << @intCast((@sizeOf(u32) * 8 - b.i32))) });
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},
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0x79 => {
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var i = @as(i64, 0);
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const number = self.stack.pop().?.i64;
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for (0..@sizeOf(i64)) |b| {
|
||||
if (number & (@as(i64, 0x1) << @intCast((@sizeOf(i64) - b - 1))) == 1) {
|
||||
break;
|
||||
}
|
||||
i += 1;
|
||||
}
|
||||
try self.stack.append(Value{ .i64 = i });
|
||||
},
|
||||
0x7a => {
|
||||
var i = @as(i64, 0);
|
||||
const number = self.stack.pop().?.i64;
|
||||
for (0..@sizeOf(i64)) |b| {
|
||||
if (number & (@as(i64, 0x1) << @intCast(b)) == 1) {
|
||||
break;
|
||||
}
|
||||
i += 1;
|
||||
}
|
||||
try self.stack.append(Value{ .i64 = i });
|
||||
},
|
||||
0x7b => {
|
||||
var i = @as(i64, 0);
|
||||
const number = self.stack.pop().?.i64;
|
||||
for (0..@sizeOf(i64)) |b| {
|
||||
if (number & (@as(i64, 0x1) << @intCast(b)) == 1) {
|
||||
i += 1;
|
||||
}
|
||||
}
|
||||
try self.stack.append(Value{ .i64 = i });
|
||||
},
|
||||
0x7c => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 + b.i64 });
|
||||
},
|
||||
0x7d => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 - b.i64 });
|
||||
},
|
||||
0x7e => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 * b.i64 });
|
||||
},
|
||||
0x7f => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = @divTrunc(a.i64, b.i64) });
|
||||
},
|
||||
0x80 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = @as(i64, @bitCast(@as(u64, @bitCast(a.i64)) / @as(u64, @bitCast(b.i64)))) });
|
||||
},
|
||||
0x81 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = @rem(a.i64, b.i64) });
|
||||
},
|
||||
0x82 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = @as(i64, @bitCast(@as(u64, @bitCast(a.i64)) % @as(u64, @bitCast(b.i64)))) });
|
||||
},
|
||||
0x83 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 & b.i64 });
|
||||
},
|
||||
0x84 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 | b.i64 });
|
||||
},
|
||||
0x85 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 ^ b.i64 });
|
||||
},
|
||||
0x86 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 << @intCast(b.i64) });
|
||||
},
|
||||
0x87 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = a.i64 >> @intCast(b.i64) });
|
||||
},
|
||||
0x88 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = @as(i64, @bitCast(@as(u64, @bitCast(a.i64)) >> @intCast(@as(u64, @bitCast(b.i64))))) });
|
||||
},
|
||||
0x89 => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = (a.i64 << @intCast(@as(u64, @bitCast(b.i64)))) | (a.i64 >> @intCast((@sizeOf(u64) * 8 - b.i64))) });
|
||||
},
|
||||
0x8a => {
|
||||
const a = self.stack.pop().?;
|
||||
const b = self.stack.pop().?;
|
||||
try self.stack.append(.{ .i64 = (a.i64 >> @intCast(@as(u64, @bitCast(b.i64)))) | (a.i64 << @intCast((@sizeOf(u64) * 8 - b.i64))) });
|
||||
},
|
||||
|
||||
0x10 => {
|
||||
const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
|
||||
frame.program_counter += integer.len;
|
||||
|
||||
self.call(allocator, integer.val, &[_]usize{}) catch {};
|
||||
},
|
||||
0xb => {
|
||||
if (for_loop) {
|
||||
frame.program_counter += 1;
|
||||
} else {
|
||||
break :loop;
|
||||
}
|
||||
},
|
||||
else => std.debug.print("instruction {} not implemented\n", .{byte}),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn callExternal(self: *Runtime, allocator: Allocator, name: []const u8, parameters: []usize) !void {
|
||||
if (self.module.exports.get(name)) |function| {
|
||||
try self.call(allocator, function, parameters);
|
||||
}
|
||||
}
|
||||
|
||||
pub fn call(self: *Runtime, allocator: Allocator, function: usize, parameters: []usize) AllocationError!void {
|
||||
const f = self.module.funcs.items[function];
|
||||
switch (f) {
|
||||
.internal => {
|
||||
const function_type = self.module.types[self.module.functions[f.internal]];
|
||||
var frame = CallFrame{
|
||||
.code = self.module.code[f.internal].code,
|
||||
.program_counter = 0x0,
|
||||
.locals = try allocator.alloc(Value, self.module.code[f.internal].locals.len + function_type.parameters.len),
|
||||
};
|
||||
|
||||
for (parameters, 0..) |p, i| {
|
||||
switch (Parser.parseType(function_type.parameters[i])) {
|
||||
.i32 => {
|
||||
frame.locals[i] = .{ .i32 = @intCast(p) };
|
||||
},
|
||||
.i64 => {
|
||||
frame.locals[i] = .{ .i64 = @intCast(p) };
|
||||
},
|
||||
else => unreachable,
|
||||
}
|
||||
}
|
||||
|
||||
for (self.module.code[f.internal].locals, function_type.parameters.len..) |local, i| {
|
||||
switch (Parser.parseType(local.types[0])) {
|
||||
.i32 => {
|
||||
frame.locals[i] = .{ .i32 = 0 };
|
||||
},
|
||||
.i64 => {
|
||||
frame.locals[i] = .{ .i64 = 0 };
|
||||
},
|
||||
else => unreachable,
|
||||
}
|
||||
}
|
||||
|
||||
try self.executeFrame(allocator, &frame);
|
||||
|
||||
allocator.free(frame.locals);
|
||||
},
|
||||
.external => {
|
||||
const name = self.module.imports.items[f.external].name;
|
||||
if (self.global_runtime.functions.get(name)) |external| {
|
||||
external(&self.stack);
|
||||
}
|
||||
},
|
||||
}
|
||||
}
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue