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vkd3d-shader/hlsl: Introduce the "error" type.

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Currently, if an expression successfully parses according to the bison grammar,
but for one reason or another cannot generate a meaningful IR instruction, we
abort parsing with YYABORT. This includes, for example, an undefined variable or
function, invalid swizzle or field reference, or a constructor with a complex or
non-numeric data type.

Aborting parsing is unfortunate, however, because it means that any further
errors in the program cannot be caught by the programmer, increasing the number
of times they will need to fix errors and recompile.

The idea of this patch is that any such expression will instead generate an IR
node whose data type is of HLSL_CLASS_ERROR. Any further expression which would
consume an "error" typed instruction will instead immediately return an
expression of type "error" (probably the same one) instead of aborting or doing
any other type-checking.

Currently these "error" instructions should not pass the parsing stage, since
hlsl_compile_shader() will immediately notice that compilation has failed and
skip any optimization, lowering, or bytecode-writing.

A further direction to take this is to pre-allocate one "error" expression
immediately when creating the HLSL parser, and return that expression when we
fail to allocate an hlsl_ir_node of any type. This means we do not need to
handle allocation errors when constructing nodes, saving us quite a lot of error
handling (which is not only tedious but currently often broken, if nothing else
by virtue of neglecting cleanup of local variables).
This commit is contained in:
Elizabeth Figura
2024-08-29 12:48:23 -05:00
committed by Henri Verbeet
parent 7daaaf6386
commit c43e5c8eb5
Notes: Henri Verbeet 2024-09-23 15:55:59 +02:00 
Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1071
6 changed files with 19 additions and 0 deletions
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11
libs/vkd3d-shader/hlsl.c
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@@ -276,6 +276,7 @@ bool hlsl_type_is_shader(const struct hlsl_type *type)
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_EFFECT_GROUP:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PASS:
case HLSL_CLASS_RASTERIZER_STATE:
case HLSL_CLASS_RENDER_TARGET_VIEW:
@@ -418,6 +419,7 @@ static void hlsl_type_calculate_reg_size(struct hlsl_ctx *ctx, struct hlsl_type
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_EFFECT_GROUP:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PASS:
case HLSL_CLASS_PIXEL_SHADER:
case HLSL_CLASS_RASTERIZER_STATE:
@@ -494,6 +496,7 @@ static bool type_is_single_component(const struct hlsl_type *type)
{
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PIXEL_SHADER:
case HLSL_CLASS_SCALAR:
case HLSL_CLASS_SAMPLER:
@@ -670,6 +673,7 @@ unsigned int hlsl_type_get_component_offset(struct hlsl_ctx *ctx, struct hlsl_ty
break;
case HLSL_CLASS_EFFECT_GROUP:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PASS:
case HLSL_CLASS_TECHNIQUE:
case HLSL_CLASS_VOID:
@@ -1061,6 +1065,7 @@ unsigned int hlsl_type_component_count(const struct hlsl_type *type)
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PIXEL_SHADER:
case HLSL_CLASS_RASTERIZER_STATE:
case HLSL_CLASS_RENDER_TARGET_VIEW:
@@ -1155,6 +1160,7 @@ bool hlsl_types_are_equal(const struct hlsl_type *t1, const struct hlsl_type *t2
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_EFFECT_GROUP:
case HLSL_CLASS_ERROR:
case HLSL_CLASS_PASS:
case HLSL_CLASS_PIXEL_SHADER:
case HLSL_CLASS_RASTERIZER_STATE:
@@ -2710,6 +2716,10 @@ struct vkd3d_string_buffer *hlsl_type_to_string(struct hlsl_ctx *ctx, const stru
}
return string;
case HLSL_CLASS_ERROR:
vkd3d_string_buffer_printf(string, "<error type>");
return string;
case HLSL_CLASS_DEPTH_STENCIL_STATE:
case HLSL_CLASS_DEPTH_STENCIL_VIEW:
case HLSL_CLASS_EFFECT_GROUP:
@@ -4146,6 +4156,7 @@ static void declare_predefined_types(struct hlsl_ctx *ctx)
ctx->builtin_types.Void = hlsl_new_simple_type(ctx, "void", HLSL_CLASS_VOID);
ctx->builtin_types.null = hlsl_new_type(ctx, "NULL", HLSL_CLASS_NULL, HLSL_TYPE_UINT, 1, 1);
ctx->builtin_types.string = hlsl_new_simple_type(ctx, "string", HLSL_CLASS_STRING);
ctx->builtin_types.error = hlsl_new_simple_type(ctx, "<error type>", HLSL_CLASS_ERROR);
hlsl_scope_add_type(ctx->globals, ctx->builtin_types.string);
hlsl_scope_add_type(ctx->globals, hlsl_new_simple_type(ctx, "DepthStencilView", HLSL_CLASS_DEPTH_STENCIL_VIEW));
hlsl_scope_add_type(ctx->globals, hlsl_new_simple_type(ctx, "DepthStencilState", HLSL_CLASS_DEPTH_STENCIL_STATE));