jscript: Use bytecode for this expression implementation.

dlls/jscript/compile.c

@@ -223,6 +223,8 @@ static HRESULT compile_expression(compiler_ctx_t *ctx, expression_t *expr)
         return compile_binary_expression(ctx, (binary_expression_t*)expr, OP_neq2);
     case EXPR_PLUS:
         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_tonum);
+    case EXPR_THIS:
+        return push_instr(ctx, OP_this) == -1 ? E_OUTOFMEMORY : S_OK;
     default:
         assert(expr->eval != compiled_expression_eval);
         return compile_interp_fallback(ctx, expr);

dlls/jscript/engine.c

@@ -1694,15 +1694,16 @@ HRESULT call_expression_eval(script_ctx_t *ctx, expression_t *_expr, DWORD flags
 }
 
 /* ECMA-262 3rd Edition    11.1.1 */
-HRESULT this_expression_eval(script_ctx_t *ctx, expression_t *expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
+HRESULT interp_this(exec_ctx_t *ctx)
 {
+    VARIANT v;
+
     TRACE("\n");
 
-    ret->type = EXPRVAL_VARIANT;
-    V_VT(&ret->u.var) = VT_DISPATCH;
-    V_DISPATCH(&ret->u.var) = ctx->exec_ctx->this_obj;
-    IDispatch_AddRef(ctx->exec_ctx->this_obj);
-    return S_OK;
+    V_VT(&v) = VT_DISPATCH;
+    V_DISPATCH(&v) = ctx->this_obj;
+    IDispatch_AddRef(ctx->this_obj);
+    return stack_push(ctx, &v);
 }
 
 /* ECMA-262 3rd Edition    10.1.4 */

dlls/jscript/engine.h

@@ -54,6 +54,7 @@ typedef struct _func_stack {
     X(null,       1, 0,0)                  \
     X(regexp,     1, ARG_STR,    ARG_INT)  \
     X(str,        1, ARG_STR,    0)        \
+    X(this,       1, 0,0)                  \
     X(tonum,      1, 0,0)                  \
     X(tree,       1, ARG_EXPR,   0)        \
     X(ret,        0, 0,0)
@@ -528,7 +529,6 @@ HRESULT array_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,expr
 HRESULT member_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT new_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT call_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
-HRESULT this_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT identifier_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT array_literal_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT property_value_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;

dlls/jscript/parser.y

@@ -1357,7 +1357,7 @@ static const expression_eval_t expression_eval_table[] = {
    member_expression_eval,
    new_expression_eval,
    call_expression_eval,
-   this_expression_eval,
+   compiled_expression_eval,
    function_expression_eval,
    identifier_expression_eval,
    array_literal_expression_eval,