summaryrefslogtreecommitdiff
path: root/src/vm/vm.zig
diff options
context:
space:
mode:
Diffstat (limited to 'src/vm/vm.zig')
-rw-r--r--src/vm/vm.zig532
1 files changed, 0 insertions, 532 deletions
diff --git a/src/vm/vm.zig b/src/vm/vm.zig
deleted file mode 100644
index f8c7db5..0000000
--- a/src/vm/vm.zig
+++ /dev/null
@@ -1,532 +0,0 @@
-const std = @import("std");
-const wasm = @import("wasm.zig");
-const Parser = @import("parse.zig");
-const Allocator = std.mem.Allocator;
-const AllocationError = error{OutOfMemory};
-
-fn leb128Decode(comptime T: type, bytes: []u8) Parser.leb128Result(T) {
- var fbs = std.io.fixedBufferStream(bytes);
- // TODO: this catch should be unrecheable
- return Parser.leb128Decode(T, fbs.reader()) catch .{ .len = 0, .val = 0 };
-}
-
-pub fn decodeLittleEndian(comptime T: type, bytes: []u8) T {
- if (T != i32 and T != i64) {
- return @as(T, 0);
- } else {
- var value = @as(T, 0);
- for (0..@sizeOf(T)) |b| {
- value |= ((bytes[b]) << @intCast((@sizeOf(T) - b - 1)));
- }
- return value;
- }
-}
-
-pub fn encodeLittleEndian(comptime T: type, bytes: *[]u8, value: T) void {
- for (0..@sizeOf(T)) |b| {
- bytes.*[b] = @intCast(((value >> @intCast((@sizeOf(T) - b - 1))) & 0xff));
- }
-}
-
-pub const CallFrame = struct {
- program_counter: usize,
- code: []u8,
- locals: []Value,
-};
-
-const ValueType = enum {
- i32,
- i64,
-};
-
-pub const Value = union(ValueType) {
- i32: i32,
- i64: i64,
-};
-
-pub const Runtime = struct {
- module: Parser.Module,
- stack: std.ArrayList(Value),
- call_stack: std.ArrayList(CallFrame),
- memory: []u8,
- global_runtime: *wasm.GlobalRuntime,
- labels: std.ArrayList(usize),
-
- pub fn init(allocator: Allocator, module: Parser.Module, global_runtime: *wasm.GlobalRuntime) !Runtime {
- const memory = try allocator.alloc(u8, module.memory.max);
- return Runtime{
- .module = module,
- .stack = try std.ArrayList(Value).initCapacity(allocator, 10),
- .call_stack = try std.ArrayList(CallFrame).initCapacity(allocator, 5),
- .labels = try std.ArrayList(usize).initCapacity(allocator, 2),
- .memory = memory,
- .global_runtime = global_runtime,
- };
- }
-
- pub fn deinit(self: *Runtime, allocator: Allocator) void {
- self.module.deinit(allocator);
- self.stack.deinit();
- self.labels.deinit();
- self.call_stack.deinit();
- allocator.free(self.memory);
- }
-
- pub fn executeFrame(self: *Runtime, allocator: Allocator, frame: *CallFrame) !void {
- var for_loop = false;
- loop: while (true) {
- const byte: u8 = frame.code[frame.program_counter];
- frame.program_counter += 1;
- std.debug.print("b: {x}\n", .{byte});
- switch (byte) {
- 0x03 => {
- try self.labels.append(frame.program_counter);
- frame.program_counter += 1;
- //const a = frame.code[frame.program_counter];
- for_loop = true;
- },
- 0x0d => {
- const label = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += label.len;
- var address = @as(usize, 0);
- for (0..(label.val)) |_| {
- address = self.labels.pop().?;
- }
-
- if (self.stack.pop().?.i32 != 0) {
- frame.program_counter = address;
- }
- },
-
- 0x20 => {
- const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
-
- frame.program_counter += integer.len;
- try self.stack.append(frame.locals[integer.val]);
- },
- 0x21 => {
- const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
-
- frame.program_counter += integer.len;
- frame.locals[integer.val] = self.stack.pop().?;
- },
- 0x22 => {
- const integer = leb128Decode(u32, frame.code[frame.program_counter..]);
-
- frame.program_counter += integer.len;
- frame.locals[integer.val] = self.stack.pop().?;
- try self.stack.append(Value{ .i32 = @intCast(integer.val) });
- },
- 0x28 => {
- const address = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += address.len;
- const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += offset.len;
- const start = (address.val + offset.val);
- const end = start + @sizeOf(u32);
- try self.stack.append(Value{ .i32 = decodeLittleEndian(i32, self.memory[start..end]) });
- },
- 0x29 => {
- const address = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += address.len;
- const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += offset.len;
- const start = (address.val + offset.val);
- const end = start + @sizeOf(u64);
- try self.stack.append(Value{ .i64 = decodeLittleEndian(i64, self.memory[start..end]) });
- },
- 0x36 => {
- const address = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += address.len;
- const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += offset.len;
- const start = (address.val + offset.val);
- const end = start + @sizeOf(u32);
- try self.stack.append(Value{ .i32 = decodeLittleEndian(i32, self.memory[start..end]) });
- },
- 0x37 => {
- const address = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += address.len;
- const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += offset.len;
- const start = (address.val + offset.val);
- const end = start + @sizeOf(u32);
- encodeLittleEndian(i32, @constCast(&self.memory[start..end]), self.stack.pop().?.i32);
- },
- 0x38 => {
- const address = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += address.len;
- const offset = leb128Decode(u32, frame.code[frame.program_counter..]);
- frame.program_counter += offset.len;
- const start = (address.val + offset.val);
- const end = start + @sizeOf(u64);
- encodeLittleEndian(i64, @constCast(&self.memory[start..end]), self.stack.pop().?.i64);
- },
- 0x41 => {
- const integer = leb128Decode(i32, frame.code[frame.program_counter..]);
-
- frame.program_counter += integer.len;
- try self.stack.append(Value{ .i32 = integer.val });
- },
- 0x42 => {
- const integer = leb128Decode(i64, frame.code[frame.program_counter..]);
-
- frame.program_counter += integer.len;
- try self.stack.append(Value{ .i64 = integer.val });
- },
- 0x45 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 == 0))) });
- },
- 0x46 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 == self.stack.pop().?.i32))) });
- },
- 0x47 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 != self.stack.pop().?.i32))) });
- },
- 0x48 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 < self.stack.pop().?.i32))) });
- },
- 0x49 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) < @as(u32, @bitCast(self.stack.pop().?.i32))))) });
- },
- 0x4a => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 > self.stack.pop().?.i32))) });
- },
- 0x4b => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) > @as(u32, @bitCast(self.stack.pop().?.i32))))) });
- },
- 0x4c => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 <= self.stack.pop().?.i32))) });
- },
- 0x4d => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) <= @as(u32, @bitCast(self.stack.pop().?.i32))))) });
- },
- 0x4e => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i32 >= self.stack.pop().?.i32))) });
- },
- 0x4f => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u32, @bitCast(self.stack.pop().?.i32)) >= @as(u32, @bitCast(self.stack.pop().?.i32))))) });
- },
-
- 0x50 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 == 0))) });
- },
- 0x51 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 == self.stack.pop().?.i64))) });
- },
- 0x52 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 != self.stack.pop().?.i64))) });
- },
- 0x53 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 < self.stack.pop().?.i64))) });
- },
- 0x54 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) < @as(u64, @bitCast(self.stack.pop().?.i64))))) });
- },
- 0x55 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 > self.stack.pop().?.i64))) });
- },
- 0x56 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) > @as(u64, @bitCast(self.stack.pop().?.i64))))) });
- },
- 0x57 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 <= self.stack.pop().?.i64))) });
- },
- 0x58 => {
- try self.stack.append(Value{ .i64 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) <= @as(u64, @bitCast(self.stack.pop().?.i64))))) });
- },
- 0x59 => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(self.stack.pop().?.i64 >= self.stack.pop().?.i64))) });
- },
- 0x5a => {
- try self.stack.append(Value{ .i32 = @intCast(@as(u1, @bitCast(@as(u64, @bitCast(self.stack.pop().?.i64)) >= @as(u64, @bitCast(self.stack.pop().?.i64))))) });
- },
-
- 0x67 => {
- var i = @as(i32, 0);
- const number = self.stack.pop().?.i32;
- for (0..@sizeOf(i32)) |b| {
- if (number & (@as(i32, 0x1) << @intCast((@sizeOf(i32) - b - 1))) == 1) {
- break;
- }
- i += 1;
- }
- try self.stack.append(Value{ .i32 = i });
- },
- 0x68 => {
- var i = @as(i32, 0);
- const number = self.stack.pop().?.i32;
- for (0..@sizeOf(i32)) |b| {
- if (number & (@as(i32, 0x1) << @intCast(b)) == 1) {
- break;
- }
- i += 1;
- }
- try self.stack.append(Value{ .i32 = i });
- },
- 0x69 => {
- var i = @as(i32, 0);
- const number = self.stack.pop().?.i32;
- for (0..@sizeOf(i32)) |b| {
- if (number & (@as(i32, 0x1) << @intCast(b)) == 1) {
- i += 1;
- }
- }
- try self.stack.append(Value{ .i32 = i });
- },
- 0x6a => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 + b.i32 });
- },
- 0x6b => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 - b.i32 });
- },
- 0x6c => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 * b.i32 });
- },
- 0x6d => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = @divTrunc(a.i32, b.i32) });
- },
- 0x6e => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) / @as(u32, @bitCast(b.i32)))) });
- },
- 0x6f => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = @rem(a.i32, b.i32) });
- },
- 0x70 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) % @as(u32, @bitCast(b.i32)))) });
- },
- 0x71 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 & b.i32 });
- },
- 0x72 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 | b.i32 });
- },
- 0x73 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 ^ b.i32 });
- },
- 0x74 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 << @intCast(b.i32) });
- },
- 0x75 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = a.i32 >> @intCast(b.i32) });
- },
- 0x76 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = @as(i32, @bitCast(@as(u32, @bitCast(a.i32)) >> @intCast(@as(u32, @bitCast(b.i32))))) });
- },
- 0x77 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = (a.i32 << @intCast(@as(u32, @bitCast(b.i32)))) | (a.i32 >> @intCast((@sizeOf(u32) * 8 - b.i32))) });
- },
- 0x78 => {
- const a = self.stack.pop().?;
- const b = self.stack.pop().?;
- try self.stack.append(.{ .i32 = (a.i32 >> @intCast(@as(u32, @bitCast(b.i32)))) | (a.i32 << @intCast((@sizeOf(u32) * 8 - b.i32))) });
- },
-
- 0x79 => {
- var i = @as(i64, 0);
- const number = self.stack.pop().?.i64;
- 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);
- }
- },
- }
- }
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-15 03:47:41 +0000