[PATCH 2/5] d3dcompiler: Synthesize a variable when indexing a non-deref node.

[Matteo Bruni]

On Mon, May 4, 2020 at 10:04 PM Zebediah Figura <z.figura12 at gmail.com> wrote:
>
> Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
> ---
>  dlls/d3dcompiler_43/hlsl.y | 122 +++++++++++++++++++++----------------
>  1 file changed, 70 insertions(+), 52 deletions(-)
>
> diff --git a/dlls/d3dcompiler_43/hlsl.y b/dlls/d3dcompiler_43/hlsl.y
> index 01b210419c8..5875705cf18 100644
> --- a/dlls/d3dcompiler_43/hlsl.y
> +++ b/dlls/d3dcompiler_43/hlsl.y
> @@ -562,32 +562,39 @@ static struct hlsl_ir_deref *new_var_deref(struct hlsl_ir_var *var, const struct
>      return deref;
>  }
>
> -static struct hlsl_ir_deref *new_record_deref(struct hlsl_ir_node *record,
> -        struct hlsl_struct_field *field, const struct source_location loc)
> +static struct hlsl_ir_node *get_var_deref(struct hlsl_ir_node *node)
>  {
> +    struct hlsl_ir_assignment *assign;
>      struct hlsl_ir_deref *deref;
> +    struct hlsl_ir_var *var;
> +    char name[27];
>
> -    if (record->type != HLSL_IR_DEREF)
> -    {
> -        struct hlsl_ir_assignment *assign;
> -        struct hlsl_ir_var *var;
> -        char name[27];
> +    if (node->type == HLSL_IR_DEREF)
> +        return node;
>
> -        sprintf(name, "<deref-%p>", record);
> -        if (!(var = new_synthetic_var(name, record->data_type, record->loc)))
> -            return NULL;
> +    sprintf(name, "<deref-%p>", node);
> +    if (!(var = new_synthetic_var(name, node->data_type, node->loc)))
> +        return NULL;
>
> -        TRACE("Synthesized variable %p for %s node.\n", var, debug_node_type(record->type));
> +    TRACE("Synthesized variable %p for %s node.\n", var, debug_node_type(node->type));
>
> -        if (!(assign = make_simple_assignment(var, record)))
> -            return NULL;
> -        list_add_after(&record->entry, &assign->node.entry);
> +    if (!(assign = make_simple_assignment(var, node)))
> +        return NULL;
> +    list_add_after(&node->entry, &assign->node.entry);
>
> -        if (!(deref = new_var_deref(var, var->loc)))
> -            return NULL;
> -        list_add_after(&assign->node.entry, &deref->node.entry);
> -        record = &deref->node;
> -    }
> +    if (!(deref = new_var_deref(var, var->loc)))
> +        return NULL;
> +    list_add_after(&assign->node.entry, &deref->node.entry);
> +    return &deref->node;
> +}
> +
> +static struct hlsl_ir_deref *new_record_deref(struct hlsl_ir_node *record,
> +        struct hlsl_struct_field *field, const struct source_location loc)
> +{
> +    struct hlsl_ir_deref *deref;
> +
> +    if (!(record = get_var_deref(record)))
> +        return NULL;
>
>      if (!(deref = d3dcompiler_alloc(sizeof(*deref))))
>          return NULL;
> @@ -599,6 +606,49 @@ static struct hlsl_ir_deref *new_record_deref(struct hlsl_ir_node *record,
>      return deref;
>  }
>
> +static struct hlsl_ir_deref *new_array_deref(struct hlsl_ir_node *array,
> +        struct hlsl_ir_node *index, const struct source_location loc)
> +{
> +    const struct hlsl_type *expr_type = array->data_type;
> +    struct hlsl_ir_deref *deref;
> +    struct hlsl_type *data_type;
> +
> +    TRACE("Array dereference from type %s.\n", debug_hlsl_type(expr_type));
> +
> +    if (expr_type->type == HLSL_CLASS_ARRAY)
> +    {
> +        data_type = expr_type->e.array.type;
> +    }
> +    else if (expr_type->type == HLSL_CLASS_MATRIX)
> +    {
> +        data_type = new_hlsl_type(NULL, HLSL_CLASS_VECTOR, expr_type->base_type, expr_type->dimx, 1);
> +    }
> +    else if (expr_type->type == HLSL_CLASS_VECTOR)
> +    {
> +        data_type = new_hlsl_type(NULL, HLSL_CLASS_SCALAR, expr_type->base_type, 1, 1);
> +    }
> +    else
> +    {
> +        if (expr_type->type == HLSL_CLASS_SCALAR)
> +            hlsl_report_message(loc, HLSL_LEVEL_ERROR, "array-indexed expression is scalar");
> +        else
> +            hlsl_report_message(loc, HLSL_LEVEL_ERROR, "expression is not array-indexable");
> +        return NULL;
> +    }
> +
> +    if (!(array = get_var_deref(array)))
> +        return NULL;
> +
> +    if (!(deref = d3dcompiler_alloc(sizeof(*deref))))
> +        return NULL;
> +
> +    init_node(&deref->node, HLSL_IR_DEREF, data_type, loc);
> +    deref->src.type = HLSL_IR_DEREF_ARRAY;
> +    deref->src.v.array.array = array;
> +    deref->src.v.array.index = index;
> +    return deref;
> +}

It should be possible to have a sensible test for this one instead.
Care to write one?