jscript: Use bytecode for pre-decrement implementation.

dlls/jscript/compile.c

@@ -651,6 +651,8 @@ static HRESULT compile_expression_noret(compiler_ctx_t *ctx, expression_t *expr,
         return compile_increment_expression(ctx, (unary_expression_t*)expr, OP_postinc, -1);
     case EXPR_POSTINC:
         return compile_increment_expression(ctx, (unary_expression_t*)expr, OP_postinc, 1);
+    case EXPR_PREDEC:
+        return compile_increment_expression(ctx, (unary_expression_t*)expr, OP_preinc, -1);
     case EXPR_PREINC:
         return compile_increment_expression(ctx, (unary_expression_t*)expr, OP_preinc, 1);
     case EXPR_SUB:

dlls/jscript/engine.c

@@ -2735,7 +2735,7 @@ static HRESULT interp_postinc(exec_ctx_t *ctx)
     return stack_push(ctx, &v);
 }
 
-/* ECMA-262 3rd Edition    11.4.4 */
+/* ECMA-262 3rd Edition    11.4.4, 11.4.5 */
 static HRESULT interp_preinc(exec_ctx_t *ctx)
 {
     const int arg = ctx->parser->code->instrs[ctx->ip].arg1.lng;
@@ -2768,40 +2768,6 @@ static HRESULT interp_preinc(exec_ctx_t *ctx)
     return stack_push(ctx, &v);
 }
 
-/* ECMA-262 3rd Edition    11.4.5 */
-HRESULT pre_decrement_expression_eval(script_ctx_t *ctx, expression_t *_expr, DWORD flags, jsexcept_t *ei, exprval_t *ret)
-{
-    unary_expression_t *expr = (unary_expression_t*)_expr;
-    VARIANT val, num;
-    exprval_t exprval;
-    HRESULT hres;
-
-    TRACE("\n");
-
-    hres = expr_eval(ctx, expr->expression, EXPR_NEWREF, ei, &exprval);
-    if(FAILED(hres))
-        return hres;
-
-    hres = exprval_value(ctx, &exprval, ei, &val);
-    if(SUCCEEDED(hres)) {
-        hres = to_number(ctx, &val, ei, &num);
-        VariantClear(&val);
-    }
-
-    if(SUCCEEDED(hres)) {
-        num_set_val(&val, num_val(&num)-1.0);
-        hres = put_value(ctx, &exprval, &val, ei);
-    }
-
-    exprval_release(&exprval);
-    if(FAILED(hres))
-        return hres;
-
-    ret->type = EXPRVAL_VARIANT;
-    ret->u.var = val;
-    return S_OK;
-}
-
 /* ECMA-262 3rd Edition    11.9.3 */
 static HRESULT equal_values(script_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcept_t *ei, BOOL *ret)
 {

dlls/jscript/engine.h

@@ -564,7 +564,6 @@ HRESULT binary_and_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*
 HRESULT instanceof_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT delete_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT typeof_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
-HRESULT pre_decrement_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT left_shift_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT right_shift_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;
 HRESULT right2_shift_expression_eval(script_ctx_t*,expression_t*,DWORD,jsexcept_t*,exprval_t*) DECLSPEC_HIDDEN;

dlls/jscript/parser.y

@@ -1325,7 +1325,7 @@ static const expression_eval_t expression_eval_table[] = {
    compiled_expression_eval,
    compiled_expression_eval,
    compiled_expression_eval,
-   pre_decrement_expression_eval,
+   compiled_expression_eval,
    compiled_expression_eval,
    compiled_expression_eval,
    compiled_expression_eval,