Add MVP of virtual machine tracer

core/engine/Cargo.toml

@@ -67,6 +67,9 @@ flowgraph = []
 # Enable Boa's VM instruction tracing.
 trace = ["js"]
 
+# Enable Boa's VM instruction tracing printing to stdout
+trace-stdout = ["trace"]
+
 # Enable Boa's additional ECMAScript features for web browsers.
 annex-b = ["boa_ast/annex-b", "boa_parser/annex-b"]
 

core/engine/src/bytecompiler/expression/binary.rs

@@ -1,6 +1,6 @@
 use crate::{
     bytecompiler::{ByteCompiler, Label, Register},
-    vm::opcode::RegisterOperand,
+    vm::operands::RegisterOperand,
 };
 use boa_ast::{
     Expression,

core/engine/src/bytecompiler/jump_control.rs

@@ -12,7 +12,7 @@
 use super::Register;
 use crate::{
     bytecompiler::{ByteCompiler, Label},
-    vm::{CallFrame, Handler, opcode::Address},
+    vm::{CallFrame, Handler, operands::Address},
 };
 use bitflags::bitflags;
 use boa_interner::Sym;

core/engine/src/bytecompiler/mod.rs

@@ -47,7 +47,8 @@ use crate::{
     vm::{
         CallFrame, CodeBlock, CodeBlockFlags, Constant, GeneratorResumeKind, GlobalFunctionBinding,
         Handler, InlineCache,
-        opcode::{Address, BindingOpcode, BytecodeEmitter, RegisterOperand},
+        opcode::{BindingOpcode, BytecodeEmitter},
+        operands::{Address, RegisterOperand},
         source_info::{SourceInfo, SourceMap, SourceMapBuilder, SourcePath},
     },
 };

core/engine/src/bytecompiler/register.rs

@@ -1,4 +1,4 @@
-use crate::vm::opcode::RegisterOperand;
+use crate::vm::operands::RegisterOperand;
 use std::mem::forget;
 
 bitflags::bitflags! {