naga/valid/
expression.rs

1use super::{compose::validate_compose, FunctionInfo, ModuleInfo, ShaderStages, TypeFlags};
2use crate::arena::UniqueArena;
3use crate::{
4    arena::Handle,
5    proc::OverloadSet as _,
6    proc::{IndexableLengthError, ResolveError},
7};
8
9#[derive(Clone, Debug, thiserror::Error)]
10#[cfg_attr(test, derive(PartialEq))]
11pub enum ExpressionError {
12    #[error("Used by a statement before it was introduced into the scope by any of the dominating blocks")]
13    NotInScope,
14    #[error("Base type {0:?} is not compatible with this expression")]
15    InvalidBaseType(Handle<crate::Expression>),
16    #[error("Accessing with index {0:?} can't be done")]
17    InvalidIndexType(Handle<crate::Expression>),
18    #[error("Accessing {0:?} via a negative index is invalid")]
19    NegativeIndex(Handle<crate::Expression>),
20    #[error("Accessing index {1} is out of {0:?} bounds")]
21    IndexOutOfBounds(Handle<crate::Expression>, u32),
22    #[error("Function argument {0:?} doesn't exist")]
23    FunctionArgumentDoesntExist(u32),
24    #[error("Loading of {0:?} can't be done")]
25    InvalidPointerType(Handle<crate::Expression>),
26    #[error("Array length of {0:?} can't be done")]
27    InvalidArrayType(Handle<crate::Expression>),
28    #[error("Get intersection of {0:?} can't be done")]
29    InvalidRayQueryType(Handle<crate::Expression>),
30    #[error("Splatting {0:?} can't be done")]
31    InvalidSplatType(Handle<crate::Expression>),
32    #[error("Swizzling {0:?} can't be done")]
33    InvalidVectorType(Handle<crate::Expression>),
34    #[error("Swizzle component {0:?} is outside of vector size {1:?}")]
35    InvalidSwizzleComponent(crate::SwizzleComponent, crate::VectorSize),
36    #[error(transparent)]
37    Compose(#[from] super::ComposeError),
38    #[error(transparent)]
39    IndexableLength(#[from] IndexableLengthError),
40    #[error("Operation {0:?} can't work with {1:?}")]
41    InvalidUnaryOperandType(crate::UnaryOperator, Handle<crate::Expression>),
42    #[error(
43        "Operation {:?} can't work with {:?} (of type {:?}) and {:?} (of type {:?})",
44        op,
45        lhs_expr,
46        lhs_type,
47        rhs_expr,
48        rhs_type
49    )]
50    InvalidBinaryOperandTypes {
51        op: crate::BinaryOperator,
52        lhs_expr: Handle<crate::Expression>,
53        lhs_type: crate::TypeInner,
54        rhs_expr: Handle<crate::Expression>,
55        rhs_type: crate::TypeInner,
56    },
57    #[error("Expected selection argument types to match, but reject value of type {reject:?} does not match accept value of value {accept:?}")]
58    SelectValuesTypeMismatch {
59        accept: crate::TypeInner,
60        reject: crate::TypeInner,
61    },
62    #[error("Expected selection condition to be a boolean value, got {actual:?}")]
63    SelectConditionNotABool { actual: crate::TypeInner },
64    #[error("Relational argument {0:?} is not a boolean vector")]
65    InvalidBooleanVector(Handle<crate::Expression>),
66    #[error("Relational argument {0:?} is not a float")]
67    InvalidFloatArgument(Handle<crate::Expression>),
68    #[error("Type resolution failed")]
69    Type(#[from] ResolveError),
70    #[error("Not a global variable")]
71    ExpectedGlobalVariable,
72    #[error("Not a global variable or a function argument")]
73    ExpectedGlobalOrArgument,
74    #[error("Needs to be an binding array instead of {0:?}")]
75    ExpectedBindingArrayType(Handle<crate::Type>),
76    #[error("Needs to be an image instead of {0:?}")]
77    ExpectedImageType(Handle<crate::Type>),
78    #[error("Needs to be an image instead of {0:?}")]
79    ExpectedSamplerType(Handle<crate::Type>),
80    #[error("Unable to operate on image class {0:?}")]
81    InvalidImageClass(crate::ImageClass),
82    #[error("Image atomics are not supported for storage format {0:?}")]
83    InvalidImageFormat(crate::StorageFormat),
84    #[error("Image atomics require atomic storage access, {0:?} is insufficient")]
85    InvalidImageStorageAccess(crate::StorageAccess),
86    #[error("Derivatives can only be taken from scalar and vector floats")]
87    InvalidDerivative,
88    #[error("Image array index parameter is misplaced")]
89    InvalidImageArrayIndex,
90    #[error("Inappropriate sample or level-of-detail index for texel access")]
91    InvalidImageOtherIndex,
92    #[error("Image array index type of {0:?} is not an integer scalar")]
93    InvalidImageArrayIndexType(Handle<crate::Expression>),
94    #[error("Image sample or level-of-detail index's type of {0:?} is not an integer scalar")]
95    InvalidImageOtherIndexType(Handle<crate::Expression>),
96    #[error("Image coordinate type of {1:?} does not match dimension {0:?}")]
97    InvalidImageCoordinateType(crate::ImageDimension, Handle<crate::Expression>),
98    #[error("Comparison sampling mismatch: image has class {image:?}, but the sampler is comparison={sampler}, and the reference was provided={has_ref}")]
99    ComparisonSamplingMismatch {
100        image: crate::ImageClass,
101        sampler: bool,
102        has_ref: bool,
103    },
104    #[error("Sample offset must be a const-expression")]
105    InvalidSampleOffsetExprType,
106    #[error("Sample offset constant {1:?} doesn't match the image dimension {0:?}")]
107    InvalidSampleOffset(crate::ImageDimension, Handle<crate::Expression>),
108    #[error("Depth reference {0:?} is not a scalar float")]
109    InvalidDepthReference(Handle<crate::Expression>),
110    #[error("Depth sample level can only be Auto or Zero")]
111    InvalidDepthSampleLevel,
112    #[error("Gather level can only be Zero")]
113    InvalidGatherLevel,
114    #[error("Gather component {0:?} doesn't exist in the image")]
115    InvalidGatherComponent(crate::SwizzleComponent),
116    #[error("Gather can't be done for image dimension {0:?}")]
117    InvalidGatherDimension(crate::ImageDimension),
118    #[error("Sample level (exact) type {0:?} has an invalid type")]
119    InvalidSampleLevelExactType(Handle<crate::Expression>),
120    #[error("Sample level (bias) type {0:?} is not a scalar float")]
121    InvalidSampleLevelBiasType(Handle<crate::Expression>),
122    #[error("Bias can't be done for image dimension {0:?}")]
123    InvalidSampleLevelBiasDimension(crate::ImageDimension),
124    #[error("Sample level (gradient) of {1:?} doesn't match the image dimension {0:?}")]
125    InvalidSampleLevelGradientType(crate::ImageDimension, Handle<crate::Expression>),
126    #[error("Clamping sample coordinate to edge is not supported with {0}")]
127    InvalidSampleClampCoordinateToEdge(alloc::string::String),
128    #[error("Unable to cast")]
129    InvalidCastArgument,
130    #[error("Invalid argument count for {0:?}")]
131    WrongArgumentCount(crate::MathFunction),
132    #[error("Argument [{1}] to {0:?} as expression {2:?} has an invalid type.")]
133    InvalidArgumentType(crate::MathFunction, u32, Handle<crate::Expression>),
134    #[error(
135        "workgroupUniformLoad result type can't be {0:?}. It can only be a constructible type."
136    )]
137    InvalidWorkGroupUniformLoadResultType(Handle<crate::Type>),
138    #[error("Shader requires capability {0:?}")]
139    MissingCapabilities(super::Capabilities),
140    #[error(transparent)]
141    Literal(#[from] LiteralError),
142    #[error("{0:?} is not supported for Width {2} {1:?} arguments yet, see https://github.com/gfx-rs/wgpu/issues/5276")]
143    UnsupportedWidth(crate::MathFunction, crate::ScalarKind, crate::Bytes),
144}
145
146#[derive(Clone, Debug, thiserror::Error)]
147#[cfg_attr(test, derive(PartialEq))]
148pub enum ConstExpressionError {
149    #[error("The expression is not a constant or override expression")]
150    NonConstOrOverride,
151    #[error("The expression is not a fully evaluated constant expression")]
152    NonFullyEvaluatedConst,
153    #[error(transparent)]
154    Compose(#[from] super::ComposeError),
155    #[error("Splatting {0:?} can't be done")]
156    InvalidSplatType(Handle<crate::Expression>),
157    #[error("Type resolution failed")]
158    Type(#[from] ResolveError),
159    #[error(transparent)]
160    Literal(#[from] LiteralError),
161    #[error(transparent)]
162    Width(#[from] super::r#type::WidthError),
163}
164
165#[derive(Clone, Debug, thiserror::Error)]
166#[cfg_attr(test, derive(PartialEq))]
167pub enum LiteralError {
168    #[error("Float literal is NaN")]
169    NaN,
170    #[error("Float literal is infinite")]
171    Infinity,
172    #[error(transparent)]
173    Width(#[from] super::r#type::WidthError),
174}
175
176struct ExpressionTypeResolver<'a> {
177    root: Handle<crate::Expression>,
178    types: &'a UniqueArena<crate::Type>,
179    info: &'a FunctionInfo,
180}
181
182impl core::ops::Index<Handle<crate::Expression>> for ExpressionTypeResolver<'_> {
183    type Output = crate::TypeInner;
184
185    #[allow(clippy::panic)]
186    fn index(&self, handle: Handle<crate::Expression>) -> &Self::Output {
187        if handle < self.root {
188            self.info[handle].ty.inner_with(self.types)
189        } else {
190            // `Validator::validate_module_handles` should have caught this.
191            panic!(
192                "Depends on {:?}, which has not been processed yet",
193                self.root
194            )
195        }
196    }
197}
198
199impl super::Validator {
200    pub(super) fn validate_const_expression(
201        &self,
202        handle: Handle<crate::Expression>,
203        gctx: crate::proc::GlobalCtx,
204        mod_info: &ModuleInfo,
205        global_expr_kind: &crate::proc::ExpressionKindTracker,
206    ) -> Result<(), ConstExpressionError> {
207        use crate::Expression as E;
208
209        if !global_expr_kind.is_const_or_override(handle) {
210            return Err(ConstExpressionError::NonConstOrOverride);
211        }
212
213        match gctx.global_expressions[handle] {
214            E::Literal(literal) => {
215                self.validate_literal(literal)?;
216            }
217            E::Constant(_) | E::ZeroValue(_) => {}
218            E::Compose { ref components, ty } => {
219                validate_compose(
220                    ty,
221                    gctx,
222                    components.iter().map(|&handle| mod_info[handle].clone()),
223                )?;
224            }
225            E::Splat { value, .. } => match *mod_info[value].inner_with(gctx.types) {
226                crate::TypeInner::Scalar { .. } => {}
227                _ => return Err(ConstExpressionError::InvalidSplatType(value)),
228            },
229            _ if global_expr_kind.is_const(handle) || self.overrides_resolved => {
230                return Err(ConstExpressionError::NonFullyEvaluatedConst)
231            }
232            // the constant evaluator will report errors about override-expressions
233            _ => {}
234        }
235
236        Ok(())
237    }
238
239    #[allow(clippy::too_many_arguments)]
240    pub(super) fn validate_expression(
241        &self,
242        root: Handle<crate::Expression>,
243        expression: &crate::Expression,
244        function: &crate::Function,
245        module: &crate::Module,
246        info: &FunctionInfo,
247        mod_info: &ModuleInfo,
248        expr_kind: &crate::proc::ExpressionKindTracker,
249    ) -> Result<ShaderStages, ExpressionError> {
250        use crate::{Expression as E, Scalar as Sc, ScalarKind as Sk, TypeInner as Ti};
251
252        let resolver = ExpressionTypeResolver {
253            root,
254            types: &module.types,
255            info,
256        };
257
258        let stages = match *expression {
259            E::Access { base, index } => {
260                let base_type = &resolver[base];
261                match *base_type {
262                    Ti::Matrix { .. }
263                    | Ti::Vector { .. }
264                    | Ti::Array { .. }
265                    | Ti::Pointer { .. }
266                    | Ti::ValuePointer { size: Some(_), .. }
267                    | Ti::BindingArray { .. } => {}
268                    ref other => {
269                        log::error!("Indexing of {:?}", other);
270                        return Err(ExpressionError::InvalidBaseType(base));
271                    }
272                };
273                match resolver[index] {
274                    //TODO: only allow one of these
275                    Ti::Scalar(Sc {
276                        kind: Sk::Sint | Sk::Uint,
277                        ..
278                    }) => {}
279                    ref other => {
280                        log::error!("Indexing by {:?}", other);
281                        return Err(ExpressionError::InvalidIndexType(index));
282                    }
283                }
284
285                // If index is const we can do check for non-negative index
286                match module
287                    .to_ctx()
288                    .eval_expr_to_u32_from(index, &function.expressions)
289                {
290                    Ok(value) => {
291                        let length = if self.overrides_resolved {
292                            base_type.indexable_length_resolved(module)
293                        } else {
294                            base_type.indexable_length_pending(module)
295                        }?;
296                        // If we know both the length and the index, we can do the
297                        // bounds check now.
298                        if let crate::proc::IndexableLength::Known(known_length) = length {
299                            if value >= known_length {
300                                return Err(ExpressionError::IndexOutOfBounds(base, value));
301                            }
302                        }
303                    }
304                    Err(crate::proc::U32EvalError::Negative) => {
305                        return Err(ExpressionError::NegativeIndex(base))
306                    }
307                    Err(crate::proc::U32EvalError::NonConst) => {}
308                }
309
310                ShaderStages::all()
311            }
312            E::AccessIndex { base, index } => {
313                fn resolve_index_limit(
314                    module: &crate::Module,
315                    top: Handle<crate::Expression>,
316                    ty: &crate::TypeInner,
317                    top_level: bool,
318                ) -> Result<u32, ExpressionError> {
319                    let limit = match *ty {
320                        Ti::Vector { size, .. }
321                        | Ti::ValuePointer {
322                            size: Some(size), ..
323                        } => size as u32,
324                        Ti::Matrix { columns, .. } => columns as u32,
325                        Ti::Array {
326                            size: crate::ArraySize::Constant(len),
327                            ..
328                        } => len.get(),
329                        Ti::Array { .. } | Ti::BindingArray { .. } => u32::MAX, // can't statically know, but need run-time checks
330                        Ti::Pointer { base, .. } if top_level => {
331                            resolve_index_limit(module, top, &module.types[base].inner, false)?
332                        }
333                        Ti::Struct { ref members, .. } => members.len() as u32,
334                        ref other => {
335                            log::error!("Indexing of {:?}", other);
336                            return Err(ExpressionError::InvalidBaseType(top));
337                        }
338                    };
339                    Ok(limit)
340                }
341
342                let limit = resolve_index_limit(module, base, &resolver[base], true)?;
343                if index >= limit {
344                    return Err(ExpressionError::IndexOutOfBounds(base, limit));
345                }
346                ShaderStages::all()
347            }
348            E::Splat { size: _, value } => match resolver[value] {
349                Ti::Scalar { .. } => ShaderStages::all(),
350                ref other => {
351                    log::error!("Splat scalar type {:?}", other);
352                    return Err(ExpressionError::InvalidSplatType(value));
353                }
354            },
355            E::Swizzle {
356                size,
357                vector,
358                pattern,
359            } => {
360                let vec_size = match resolver[vector] {
361                    Ti::Vector { size: vec_size, .. } => vec_size,
362                    ref other => {
363                        log::error!("Swizzle vector type {:?}", other);
364                        return Err(ExpressionError::InvalidVectorType(vector));
365                    }
366                };
367                for &sc in pattern[..size as usize].iter() {
368                    if sc as u8 >= vec_size as u8 {
369                        return Err(ExpressionError::InvalidSwizzleComponent(sc, vec_size));
370                    }
371                }
372                ShaderStages::all()
373            }
374            E::Literal(literal) => {
375                self.validate_literal(literal)?;
376                ShaderStages::all()
377            }
378            E::Constant(_) | E::Override(_) | E::ZeroValue(_) => ShaderStages::all(),
379            E::Compose { ref components, ty } => {
380                validate_compose(
381                    ty,
382                    module.to_ctx(),
383                    components.iter().map(|&handle| info[handle].ty.clone()),
384                )?;
385                ShaderStages::all()
386            }
387            E::FunctionArgument(index) => {
388                if index >= function.arguments.len() as u32 {
389                    return Err(ExpressionError::FunctionArgumentDoesntExist(index));
390                }
391                ShaderStages::all()
392            }
393            E::GlobalVariable(_handle) => ShaderStages::all(),
394            E::LocalVariable(_handle) => ShaderStages::all(),
395            E::Load { pointer } => {
396                match resolver[pointer] {
397                    Ti::Pointer { base, .. }
398                        if self.types[base.index()]
399                            .flags
400                            .contains(TypeFlags::SIZED | TypeFlags::DATA) => {}
401                    Ti::ValuePointer { .. } => {}
402                    ref other => {
403                        log::error!("Loading {:?}", other);
404                        return Err(ExpressionError::InvalidPointerType(pointer));
405                    }
406                }
407                ShaderStages::all()
408            }
409            E::ImageSample {
410                image,
411                sampler,
412                gather,
413                coordinate,
414                array_index,
415                offset,
416                level,
417                depth_ref,
418                clamp_to_edge,
419            } => {
420                // check the validity of expressions
421                let image_ty = Self::global_var_ty(module, function, image)?;
422                let sampler_ty = Self::global_var_ty(module, function, sampler)?;
423
424                let comparison = match module.types[sampler_ty].inner {
425                    Ti::Sampler { comparison } => comparison,
426                    _ => return Err(ExpressionError::ExpectedSamplerType(sampler_ty)),
427                };
428
429                let (class, dim) = match module.types[image_ty].inner {
430                    Ti::Image {
431                        class,
432                        arrayed,
433                        dim,
434                    } => {
435                        // check the array property
436                        if arrayed != array_index.is_some() {
437                            return Err(ExpressionError::InvalidImageArrayIndex);
438                        }
439                        if let Some(expr) = array_index {
440                            match resolver[expr] {
441                                Ti::Scalar(Sc {
442                                    kind: Sk::Sint | Sk::Uint,
443                                    ..
444                                }) => {}
445                                _ => return Err(ExpressionError::InvalidImageArrayIndexType(expr)),
446                            }
447                        }
448                        (class, dim)
449                    }
450                    _ => return Err(ExpressionError::ExpectedImageType(image_ty)),
451                };
452
453                // check sampling and comparison properties
454                let image_depth = match class {
455                    crate::ImageClass::Sampled {
456                        kind: crate::ScalarKind::Float,
457                        multi: false,
458                    } => false,
459                    crate::ImageClass::Sampled {
460                        kind: crate::ScalarKind::Uint | crate::ScalarKind::Sint,
461                        multi: false,
462                    } if gather.is_some() => false,
463                    crate::ImageClass::Depth { multi: false } => true,
464                    _ => return Err(ExpressionError::InvalidImageClass(class)),
465                };
466                if comparison != depth_ref.is_some() || (comparison && !image_depth) {
467                    return Err(ExpressionError::ComparisonSamplingMismatch {
468                        image: class,
469                        sampler: comparison,
470                        has_ref: depth_ref.is_some(),
471                    });
472                }
473
474                // check texture coordinates type
475                let num_components = match dim {
476                    crate::ImageDimension::D1 => 1,
477                    crate::ImageDimension::D2 => 2,
478                    crate::ImageDimension::D3 | crate::ImageDimension::Cube => 3,
479                };
480                match resolver[coordinate] {
481                    Ti::Scalar(Sc {
482                        kind: Sk::Float, ..
483                    }) if num_components == 1 => {}
484                    Ti::Vector {
485                        size,
486                        scalar:
487                            Sc {
488                                kind: Sk::Float, ..
489                            },
490                    } if size as u32 == num_components => {}
491                    _ => return Err(ExpressionError::InvalidImageCoordinateType(dim, coordinate)),
492                }
493
494                // check constant offset
495                if let Some(const_expr) = offset {
496                    if !expr_kind.is_const(const_expr) {
497                        return Err(ExpressionError::InvalidSampleOffsetExprType);
498                    }
499
500                    match resolver[const_expr] {
501                        Ti::Scalar(Sc { kind: Sk::Sint, .. }) if num_components == 1 => {}
502                        Ti::Vector {
503                            size,
504                            scalar: Sc { kind: Sk::Sint, .. },
505                        } if size as u32 == num_components => {}
506                        _ => {
507                            return Err(ExpressionError::InvalidSampleOffset(dim, const_expr));
508                        }
509                    }
510                }
511
512                // check depth reference type
513                if let Some(expr) = depth_ref {
514                    match resolver[expr] {
515                        Ti::Scalar(Sc {
516                            kind: Sk::Float, ..
517                        }) => {}
518                        _ => return Err(ExpressionError::InvalidDepthReference(expr)),
519                    }
520                    match level {
521                        crate::SampleLevel::Auto | crate::SampleLevel::Zero => {}
522                        _ => return Err(ExpressionError::InvalidDepthSampleLevel),
523                    }
524                }
525
526                if let Some(component) = gather {
527                    match dim {
528                        crate::ImageDimension::D2 | crate::ImageDimension::Cube => {}
529                        crate::ImageDimension::D1 | crate::ImageDimension::D3 => {
530                            return Err(ExpressionError::InvalidGatherDimension(dim))
531                        }
532                    };
533                    let max_component = match class {
534                        crate::ImageClass::Depth { .. } => crate::SwizzleComponent::X,
535                        _ => crate::SwizzleComponent::W,
536                    };
537                    if component > max_component {
538                        return Err(ExpressionError::InvalidGatherComponent(component));
539                    }
540                    match level {
541                        crate::SampleLevel::Zero => {}
542                        _ => return Err(ExpressionError::InvalidGatherLevel),
543                    }
544                }
545
546                // Clamping coordinate to edge is only supported with 2d non-arrayed, sampled images
547                // when sampling from level Zero without any offset, gather, or depth comparison.
548                if clamp_to_edge {
549                    if !matches!(
550                        class,
551                        crate::ImageClass::Sampled {
552                            kind: crate::ScalarKind::Float,
553                            multi: false
554                        }
555                    ) {
556                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
557                            alloc::format!("image class `{class:?}`"),
558                        ));
559                    }
560                    if dim != crate::ImageDimension::D2 {
561                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
562                            alloc::format!("image dimension `{dim:?}`"),
563                        ));
564                    }
565                    if gather.is_some() {
566                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
567                            "gather".into(),
568                        ));
569                    }
570                    if array_index.is_some() {
571                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
572                            "array index".into(),
573                        ));
574                    }
575                    if offset.is_some() {
576                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
577                            "offset".into(),
578                        ));
579                    }
580                    if level != crate::SampleLevel::Zero {
581                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
582                            "non-zero level".into(),
583                        ));
584                    }
585                    if depth_ref.is_some() {
586                        return Err(ExpressionError::InvalidSampleClampCoordinateToEdge(
587                            "depth comparison".into(),
588                        ));
589                    }
590                }
591
592                // check level properties
593                match level {
594                    crate::SampleLevel::Auto => ShaderStages::FRAGMENT,
595                    crate::SampleLevel::Zero => ShaderStages::all(),
596                    crate::SampleLevel::Exact(expr) => {
597                        match class {
598                            crate::ImageClass::Depth { .. } => match resolver[expr] {
599                                Ti::Scalar(Sc {
600                                    kind: Sk::Sint | Sk::Uint,
601                                    ..
602                                }) => {}
603                                _ => {
604                                    return Err(ExpressionError::InvalidSampleLevelExactType(expr))
605                                }
606                            },
607                            _ => match resolver[expr] {
608                                Ti::Scalar(Sc {
609                                    kind: Sk::Float, ..
610                                }) => {}
611                                _ => {
612                                    return Err(ExpressionError::InvalidSampleLevelExactType(expr))
613                                }
614                            },
615                        }
616                        ShaderStages::all()
617                    }
618                    crate::SampleLevel::Bias(expr) => {
619                        match resolver[expr] {
620                            Ti::Scalar(Sc {
621                                kind: Sk::Float, ..
622                            }) => {}
623                            _ => return Err(ExpressionError::InvalidSampleLevelBiasType(expr)),
624                        }
625                        match class {
626                            crate::ImageClass::Sampled {
627                                kind: Sk::Float,
628                                multi: false,
629                            } => {
630                                if dim == crate::ImageDimension::D1 {
631                                    return Err(ExpressionError::InvalidSampleLevelBiasDimension(
632                                        dim,
633                                    ));
634                                }
635                            }
636                            _ => return Err(ExpressionError::InvalidImageClass(class)),
637                        }
638                        ShaderStages::FRAGMENT
639                    }
640                    crate::SampleLevel::Gradient { x, y } => {
641                        match resolver[x] {
642                            Ti::Scalar(Sc {
643                                kind: Sk::Float, ..
644                            }) if num_components == 1 => {}
645                            Ti::Vector {
646                                size,
647                                scalar:
648                                    Sc {
649                                        kind: Sk::Float, ..
650                                    },
651                            } if size as u32 == num_components => {}
652                            _ => {
653                                return Err(ExpressionError::InvalidSampleLevelGradientType(dim, x))
654                            }
655                        }
656                        match resolver[y] {
657                            Ti::Scalar(Sc {
658                                kind: Sk::Float, ..
659                            }) if num_components == 1 => {}
660                            Ti::Vector {
661                                size,
662                                scalar:
663                                    Sc {
664                                        kind: Sk::Float, ..
665                                    },
666                            } if size as u32 == num_components => {}
667                            _ => {
668                                return Err(ExpressionError::InvalidSampleLevelGradientType(dim, y))
669                            }
670                        }
671                        ShaderStages::all()
672                    }
673                }
674            }
675            E::ImageLoad {
676                image,
677                coordinate,
678                array_index,
679                sample,
680                level,
681            } => {
682                let ty = Self::global_var_ty(module, function, image)?;
683                let Ti::Image {
684                    class,
685                    arrayed,
686                    dim,
687                } = module.types[ty].inner
688                else {
689                    return Err(ExpressionError::ExpectedImageType(ty));
690                };
691
692                match resolver[coordinate].image_storage_coordinates() {
693                    Some(coord_dim) if coord_dim == dim => {}
694                    _ => return Err(ExpressionError::InvalidImageCoordinateType(dim, coordinate)),
695                };
696                if arrayed != array_index.is_some() {
697                    return Err(ExpressionError::InvalidImageArrayIndex);
698                }
699                if let Some(expr) = array_index {
700                    if !matches!(resolver[expr], Ti::Scalar(Sc::I32 | Sc::U32)) {
701                        return Err(ExpressionError::InvalidImageArrayIndexType(expr));
702                    }
703                }
704
705                match (sample, class.is_multisampled()) {
706                    (None, false) => {}
707                    (Some(sample), true) => {
708                        if !matches!(resolver[sample], Ti::Scalar(Sc::I32 | Sc::U32)) {
709                            return Err(ExpressionError::InvalidImageOtherIndexType(sample));
710                        }
711                    }
712                    _ => {
713                        return Err(ExpressionError::InvalidImageOtherIndex);
714                    }
715                }
716
717                match (level, class.is_mipmapped()) {
718                    (None, false) => {}
719                    (Some(level), true) => match resolver[level] {
720                        Ti::Scalar(Sc {
721                            kind: Sk::Sint | Sk::Uint,
722                            width: _,
723                        }) => {}
724                        _ => return Err(ExpressionError::InvalidImageArrayIndexType(level)),
725                    },
726                    _ => {
727                        return Err(ExpressionError::InvalidImageOtherIndex);
728                    }
729                }
730                ShaderStages::all()
731            }
732            E::ImageQuery { image, query } => {
733                let ty = Self::global_var_ty(module, function, image)?;
734                match module.types[ty].inner {
735                    Ti::Image { class, arrayed, .. } => {
736                        let good = match query {
737                            crate::ImageQuery::NumLayers => arrayed,
738                            crate::ImageQuery::Size { level: None } => true,
739                            crate::ImageQuery::Size { level: Some(level) } => {
740                                match resolver[level] {
741                                    Ti::Scalar(Sc::I32 | Sc::U32) => {}
742                                    _ => {
743                                        return Err(ExpressionError::InvalidImageOtherIndexType(
744                                            level,
745                                        ))
746                                    }
747                                }
748                                class.is_mipmapped()
749                            }
750                            crate::ImageQuery::NumLevels => class.is_mipmapped(),
751                            crate::ImageQuery::NumSamples => class.is_multisampled(),
752                        };
753                        if !good {
754                            return Err(ExpressionError::InvalidImageClass(class));
755                        }
756                    }
757                    _ => return Err(ExpressionError::ExpectedImageType(ty)),
758                }
759                ShaderStages::all()
760            }
761            E::Unary { op, expr } => {
762                use crate::UnaryOperator as Uo;
763                let inner = &resolver[expr];
764                match (op, inner.scalar_kind()) {
765                    (Uo::Negate, Some(Sk::Float | Sk::Sint))
766                    | (Uo::LogicalNot, Some(Sk::Bool))
767                    | (Uo::BitwiseNot, Some(Sk::Sint | Sk::Uint)) => {}
768                    other => {
769                        log::error!("Op {:?} kind {:?}", op, other);
770                        return Err(ExpressionError::InvalidUnaryOperandType(op, expr));
771                    }
772                }
773                ShaderStages::all()
774            }
775            E::Binary { op, left, right } => {
776                use crate::BinaryOperator as Bo;
777                let left_inner = &resolver[left];
778                let right_inner = &resolver[right];
779                let good = match op {
780                    Bo::Add | Bo::Subtract => match *left_inner {
781                        Ti::Scalar(scalar) | Ti::Vector { scalar, .. } => match scalar.kind {
782                            Sk::Uint | Sk::Sint | Sk::Float => left_inner == right_inner,
783                            Sk::Bool | Sk::AbstractInt | Sk::AbstractFloat => false,
784                        },
785                        Ti::Matrix { .. } => left_inner == right_inner,
786                        _ => false,
787                    },
788                    Bo::Divide | Bo::Modulo => match *left_inner {
789                        Ti::Scalar(scalar) | Ti::Vector { scalar, .. } => match scalar.kind {
790                            Sk::Uint | Sk::Sint | Sk::Float => left_inner == right_inner,
791                            Sk::Bool | Sk::AbstractInt | Sk::AbstractFloat => false,
792                        },
793                        _ => false,
794                    },
795                    Bo::Multiply => {
796                        let kind_allowed = match left_inner.scalar_kind() {
797                            Some(Sk::Uint | Sk::Sint | Sk::Float) => true,
798                            Some(Sk::Bool | Sk::AbstractInt | Sk::AbstractFloat) | None => false,
799                        };
800                        let types_match = match (left_inner, right_inner) {
801                            // Straight scalar and mixed scalar/vector.
802                            (&Ti::Scalar(scalar1), &Ti::Scalar(scalar2))
803                            | (
804                                &Ti::Vector {
805                                    scalar: scalar1, ..
806                                },
807                                &Ti::Scalar(scalar2),
808                            )
809                            | (
810                                &Ti::Scalar(scalar1),
811                                &Ti::Vector {
812                                    scalar: scalar2, ..
813                                },
814                            ) => scalar1 == scalar2,
815                            // Scalar/matrix.
816                            (
817                                &Ti::Scalar(Sc {
818                                    kind: Sk::Float, ..
819                                }),
820                                &Ti::Matrix { .. },
821                            )
822                            | (
823                                &Ti::Matrix { .. },
824                                &Ti::Scalar(Sc {
825                                    kind: Sk::Float, ..
826                                }),
827                            ) => true,
828                            // Vector/vector.
829                            (
830                                &Ti::Vector {
831                                    size: size1,
832                                    scalar: scalar1,
833                                },
834                                &Ti::Vector {
835                                    size: size2,
836                                    scalar: scalar2,
837                                },
838                            ) => scalar1 == scalar2 && size1 == size2,
839                            // Matrix * vector.
840                            (
841                                &Ti::Matrix { columns, .. },
842                                &Ti::Vector {
843                                    size,
844                                    scalar:
845                                        Sc {
846                                            kind: Sk::Float, ..
847                                        },
848                                },
849                            ) => columns == size,
850                            // Vector * matrix.
851                            (
852                                &Ti::Vector {
853                                    size,
854                                    scalar:
855                                        Sc {
856                                            kind: Sk::Float, ..
857                                        },
858                                },
859                                &Ti::Matrix { rows, .. },
860                            ) => size == rows,
861                            (&Ti::Matrix { columns, .. }, &Ti::Matrix { rows, .. }) => {
862                                columns == rows
863                            }
864                            _ => false,
865                        };
866                        let left_width = left_inner.scalar_width().unwrap_or(0);
867                        let right_width = right_inner.scalar_width().unwrap_or(0);
868                        kind_allowed && types_match && left_width == right_width
869                    }
870                    Bo::Equal | Bo::NotEqual => left_inner.is_sized() && left_inner == right_inner,
871                    Bo::Less | Bo::LessEqual | Bo::Greater | Bo::GreaterEqual => {
872                        match *left_inner {
873                            Ti::Scalar(scalar) | Ti::Vector { scalar, .. } => match scalar.kind {
874                                Sk::Uint | Sk::Sint | Sk::Float => left_inner == right_inner,
875                                Sk::Bool | Sk::AbstractInt | Sk::AbstractFloat => false,
876                            },
877                            ref other => {
878                                log::error!("Op {:?} left type {:?}", op, other);
879                                false
880                            }
881                        }
882                    }
883                    Bo::LogicalAnd | Bo::LogicalOr => match *left_inner {
884                        Ti::Scalar(Sc { kind: Sk::Bool, .. })
885                        | Ti::Vector {
886                            scalar: Sc { kind: Sk::Bool, .. },
887                            ..
888                        } => left_inner == right_inner,
889                        ref other => {
890                            log::error!("Op {:?} left type {:?}", op, other);
891                            false
892                        }
893                    },
894                    Bo::And | Bo::InclusiveOr => match *left_inner {
895                        Ti::Scalar(scalar) | Ti::Vector { scalar, .. } => match scalar.kind {
896                            Sk::Bool | Sk::Sint | Sk::Uint => left_inner == right_inner,
897                            Sk::Float | Sk::AbstractInt | Sk::AbstractFloat => false,
898                        },
899                        ref other => {
900                            log::error!("Op {:?} left type {:?}", op, other);
901                            false
902                        }
903                    },
904                    Bo::ExclusiveOr => match *left_inner {
905                        Ti::Scalar(scalar) | Ti::Vector { scalar, .. } => match scalar.kind {
906                            Sk::Sint | Sk::Uint => left_inner == right_inner,
907                            Sk::Bool | Sk::Float | Sk::AbstractInt | Sk::AbstractFloat => false,
908                        },
909                        ref other => {
910                            log::error!("Op {:?} left type {:?}", op, other);
911                            false
912                        }
913                    },
914                    Bo::ShiftLeft | Bo::ShiftRight => {
915                        let (base_size, base_scalar) = match *left_inner {
916                            Ti::Scalar(scalar) => (Ok(None), scalar),
917                            Ti::Vector { size, scalar } => (Ok(Some(size)), scalar),
918                            ref other => {
919                                log::error!("Op {:?} base type {:?}", op, other);
920                                (Err(()), Sc::BOOL)
921                            }
922                        };
923                        let shift_size = match *right_inner {
924                            Ti::Scalar(Sc { kind: Sk::Uint, .. }) => Ok(None),
925                            Ti::Vector {
926                                size,
927                                scalar: Sc { kind: Sk::Uint, .. },
928                            } => Ok(Some(size)),
929                            ref other => {
930                                log::error!("Op {:?} shift type {:?}", op, other);
931                                Err(())
932                            }
933                        };
934                        match base_scalar.kind {
935                            Sk::Sint | Sk::Uint => base_size.is_ok() && base_size == shift_size,
936                            Sk::Float | Sk::AbstractInt | Sk::AbstractFloat | Sk::Bool => false,
937                        }
938                    }
939                };
940                if !good {
941                    log::error!(
942                        "Left: {:?} of type {:?}",
943                        function.expressions[left],
944                        left_inner
945                    );
946                    log::error!(
947                        "Right: {:?} of type {:?}",
948                        function.expressions[right],
949                        right_inner
950                    );
951                    return Err(ExpressionError::InvalidBinaryOperandTypes {
952                        op,
953                        lhs_expr: left,
954                        lhs_type: left_inner.clone(),
955                        rhs_expr: right,
956                        rhs_type: right_inner.clone(),
957                    });
958                }
959                ShaderStages::all()
960            }
961            E::Select {
962                condition,
963                accept,
964                reject,
965            } => {
966                let accept_inner = &resolver[accept];
967                let reject_inner = &resolver[reject];
968                let condition_ty = &resolver[condition];
969                let condition_good = match *condition_ty {
970                    Ti::Scalar(Sc {
971                        kind: Sk::Bool,
972                        width: _,
973                    }) => {
974                        // When `condition` is a single boolean, `accept` and
975                        // `reject` can be vectors or scalars.
976                        match *accept_inner {
977                            Ti::Scalar { .. } | Ti::Vector { .. } => true,
978                            _ => false,
979                        }
980                    }
981                    Ti::Vector {
982                        size,
983                        scalar:
984                            Sc {
985                                kind: Sk::Bool,
986                                width: _,
987                            },
988                    } => match *accept_inner {
989                        Ti::Vector {
990                            size: other_size, ..
991                        } => size == other_size,
992                        _ => false,
993                    },
994                    _ => false,
995                };
996                if accept_inner != reject_inner {
997                    return Err(ExpressionError::SelectValuesTypeMismatch {
998                        accept: accept_inner.clone(),
999                        reject: reject_inner.clone(),
1000                    });
1001                }
1002                if !condition_good {
1003                    return Err(ExpressionError::SelectConditionNotABool {
1004                        actual: condition_ty.clone(),
1005                    });
1006                }
1007                ShaderStages::all()
1008            }
1009            E::Derivative { expr, .. } => {
1010                match resolver[expr] {
1011                    Ti::Scalar(Sc {
1012                        kind: Sk::Float, ..
1013                    })
1014                    | Ti::Vector {
1015                        scalar:
1016                            Sc {
1017                                kind: Sk::Float, ..
1018                            },
1019                        ..
1020                    } => {}
1021                    _ => return Err(ExpressionError::InvalidDerivative),
1022                }
1023                ShaderStages::FRAGMENT
1024            }
1025            E::Relational { fun, argument } => {
1026                use crate::RelationalFunction as Rf;
1027                let argument_inner = &resolver[argument];
1028                match fun {
1029                    Rf::All | Rf::Any => match *argument_inner {
1030                        Ti::Vector {
1031                            scalar: Sc { kind: Sk::Bool, .. },
1032                            ..
1033                        } => {}
1034                        ref other => {
1035                            log::error!("All/Any of type {:?}", other);
1036                            return Err(ExpressionError::InvalidBooleanVector(argument));
1037                        }
1038                    },
1039                    Rf::IsNan | Rf::IsInf => match *argument_inner {
1040                        Ti::Scalar(scalar) | Ti::Vector { scalar, .. }
1041                            if scalar.kind == Sk::Float => {}
1042                        ref other => {
1043                            log::error!("Float test of type {:?}", other);
1044                            return Err(ExpressionError::InvalidFloatArgument(argument));
1045                        }
1046                    },
1047                }
1048                ShaderStages::all()
1049            }
1050            E::Math {
1051                fun,
1052                arg,
1053                arg1,
1054                arg2,
1055                arg3,
1056            } => {
1057                let actuals: &[_] = match (arg1, arg2, arg3) {
1058                    (None, None, None) => &[arg],
1059                    (Some(arg1), None, None) => &[arg, arg1],
1060                    (Some(arg1), Some(arg2), None) => &[arg, arg1, arg2],
1061                    (Some(arg1), Some(arg2), Some(arg3)) => &[arg, arg1, arg2, arg3],
1062                    _ => return Err(ExpressionError::WrongArgumentCount(fun)),
1063                };
1064
1065                let resolve = |arg| &resolver[arg];
1066                let actual_types: &[_] = match *actuals {
1067                    [arg0] => &[resolve(arg0)],
1068                    [arg0, arg1] => &[resolve(arg0), resolve(arg1)],
1069                    [arg0, arg1, arg2] => &[resolve(arg0), resolve(arg1), resolve(arg2)],
1070                    [arg0, arg1, arg2, arg3] => {
1071                        &[resolve(arg0), resolve(arg1), resolve(arg2), resolve(arg3)]
1072                    }
1073                    _ => unreachable!(),
1074                };
1075
1076                // Start with the set of all overloads available for `fun`.
1077                let mut overloads = fun.overloads();
1078                log::debug!(
1079                    "initial overloads for {:?}: {:#?}",
1080                    fun,
1081                    overloads.for_debug(&module.types)
1082                );
1083
1084                // If any argument is not a constant expression, then no
1085                // overloads that accept abstract values should be considered.
1086                // `OverloadSet::concrete_only` is supposed to help impose this
1087                // restriction. However, no `MathFunction` accepts a mix of
1088                // abstract and concrete arguments, so we don't need to worry
1089                // about that here.
1090
1091                for (i, (&expr, &ty)) in actuals.iter().zip(actual_types).enumerate() {
1092                    // Remove overloads that cannot accept an `i`'th
1093                    // argument arguments of type `ty`.
1094                    overloads = overloads.arg(i, ty, &module.types);
1095                    log::debug!(
1096                        "overloads after arg {i}: {:#?}",
1097                        overloads.for_debug(&module.types)
1098                    );
1099
1100                    if overloads.is_empty() {
1101                        log::debug!("all overloads eliminated");
1102                        return Err(ExpressionError::InvalidArgumentType(fun, i as u32, expr));
1103                    }
1104                }
1105
1106                if actuals.len() < overloads.min_arguments() {
1107                    return Err(ExpressionError::WrongArgumentCount(fun));
1108                }
1109
1110                ShaderStages::all()
1111            }
1112            E::As {
1113                expr,
1114                kind,
1115                convert,
1116            } => {
1117                let mut base_scalar = match resolver[expr] {
1118                    crate::TypeInner::Scalar(scalar) | crate::TypeInner::Vector { scalar, .. } => {
1119                        scalar
1120                    }
1121                    crate::TypeInner::Matrix { scalar, .. } => scalar,
1122                    _ => return Err(ExpressionError::InvalidCastArgument),
1123                };
1124                base_scalar.kind = kind;
1125                if let Some(width) = convert {
1126                    base_scalar.width = width;
1127                }
1128                if self.check_width(base_scalar).is_err() {
1129                    return Err(ExpressionError::InvalidCastArgument);
1130                }
1131                ShaderStages::all()
1132            }
1133            E::CallResult(function) => mod_info.functions[function.index()].available_stages,
1134            E::AtomicResult { .. } => {
1135                // These expressions are validated when we check the `Atomic` statement
1136                // that refers to them, because we have all the information we need at
1137                // that point. The checks driven by `Validator::needs_visit` ensure
1138                // that this expression is indeed visited by one `Atomic` statement.
1139                ShaderStages::all()
1140            }
1141            E::WorkGroupUniformLoadResult { ty } => {
1142                if self.types[ty.index()]
1143                    .flags
1144                    // Sized | Constructible is exactly the types currently supported by
1145                    // WorkGroupUniformLoad
1146                    .contains(TypeFlags::SIZED | TypeFlags::CONSTRUCTIBLE)
1147                {
1148                    ShaderStages::COMPUTE
1149                } else {
1150                    return Err(ExpressionError::InvalidWorkGroupUniformLoadResultType(ty));
1151                }
1152            }
1153            E::ArrayLength(expr) => match resolver[expr] {
1154                Ti::Pointer { base, .. } => {
1155                    let base_ty = &resolver.types[base];
1156                    if let Ti::Array {
1157                        size: crate::ArraySize::Dynamic,
1158                        ..
1159                    } = base_ty.inner
1160                    {
1161                        ShaderStages::all()
1162                    } else {
1163                        return Err(ExpressionError::InvalidArrayType(expr));
1164                    }
1165                }
1166                ref other => {
1167                    log::error!("Array length of {:?}", other);
1168                    return Err(ExpressionError::InvalidArrayType(expr));
1169                }
1170            },
1171            E::RayQueryProceedResult => ShaderStages::all(),
1172            E::RayQueryGetIntersection {
1173                query,
1174                committed: _,
1175            } => match resolver[query] {
1176                Ti::Pointer {
1177                    base,
1178                    space: crate::AddressSpace::Function,
1179                } => match resolver.types[base].inner {
1180                    Ti::RayQuery { .. } => ShaderStages::all(),
1181                    ref other => {
1182                        log::error!("Intersection result of a pointer to {:?}", other);
1183                        return Err(ExpressionError::InvalidRayQueryType(query));
1184                    }
1185                },
1186                ref other => {
1187                    log::error!("Intersection result of {:?}", other);
1188                    return Err(ExpressionError::InvalidRayQueryType(query));
1189                }
1190            },
1191            E::RayQueryVertexPositions {
1192                query,
1193                committed: _,
1194            } => match resolver[query] {
1195                Ti::Pointer {
1196                    base,
1197                    space: crate::AddressSpace::Function,
1198                } => match resolver.types[base].inner {
1199                    Ti::RayQuery {
1200                        vertex_return: true,
1201                    } => ShaderStages::all(),
1202                    ref other => {
1203                        log::error!("Intersection result of a pointer to {:?}", other);
1204                        return Err(ExpressionError::InvalidRayQueryType(query));
1205                    }
1206                },
1207                ref other => {
1208                    log::error!("Intersection result of {:?}", other);
1209                    return Err(ExpressionError::InvalidRayQueryType(query));
1210                }
1211            },
1212            E::SubgroupBallotResult | E::SubgroupOperationResult { .. } => self.subgroup_stages,
1213        };
1214        Ok(stages)
1215    }
1216
1217    fn global_var_ty(
1218        module: &crate::Module,
1219        function: &crate::Function,
1220        expr: Handle<crate::Expression>,
1221    ) -> Result<Handle<crate::Type>, ExpressionError> {
1222        use crate::Expression as Ex;
1223
1224        match function.expressions[expr] {
1225            Ex::GlobalVariable(var_handle) => Ok(module.global_variables[var_handle].ty),
1226            Ex::FunctionArgument(i) => Ok(function.arguments[i as usize].ty),
1227            Ex::Access { base, .. } | Ex::AccessIndex { base, .. } => {
1228                match function.expressions[base] {
1229                    Ex::GlobalVariable(var_handle) => {
1230                        let array_ty = module.global_variables[var_handle].ty;
1231
1232                        match module.types[array_ty].inner {
1233                            crate::TypeInner::BindingArray { base, .. } => Ok(base),
1234                            _ => Err(ExpressionError::ExpectedBindingArrayType(array_ty)),
1235                        }
1236                    }
1237                    _ => Err(ExpressionError::ExpectedGlobalVariable),
1238                }
1239            }
1240            _ => Err(ExpressionError::ExpectedGlobalVariable),
1241        }
1242    }
1243
1244    pub fn validate_literal(&self, literal: crate::Literal) -> Result<(), LiteralError> {
1245        let _ = self.check_width(literal.scalar())?;
1246        check_literal_value(literal)?;
1247
1248        Ok(())
1249    }
1250}
1251
1252pub fn check_literal_value(literal: crate::Literal) -> Result<(), LiteralError> {
1253    let is_nan = match literal {
1254        crate::Literal::F64(v) => v.is_nan(),
1255        crate::Literal::F32(v) => v.is_nan(),
1256        _ => false,
1257    };
1258    if is_nan {
1259        return Err(LiteralError::NaN);
1260    }
1261
1262    let is_infinite = match literal {
1263        crate::Literal::F64(v) => v.is_infinite(),
1264        crate::Literal::F32(v) => v.is_infinite(),
1265        _ => false,
1266    };
1267    if is_infinite {
1268        return Err(LiteralError::Infinity);
1269    }
1270
1271    Ok(())
1272}
1273
1274#[cfg(test)]
1275/// Validate a module containing the given expression, expecting an error.
1276fn validate_with_expression(
1277    expr: crate::Expression,
1278    caps: super::Capabilities,
1279) -> Result<ModuleInfo, crate::span::WithSpan<super::ValidationError>> {
1280    use crate::span::Span;
1281
1282    let mut function = crate::Function::default();
1283    function.expressions.append(expr, Span::default());
1284    function.body.push(
1285        crate::Statement::Emit(function.expressions.range_from(0)),
1286        Span::default(),
1287    );
1288
1289    let mut module = crate::Module::default();
1290    module.functions.append(function, Span::default());
1291
1292    let mut validator = super::Validator::new(super::ValidationFlags::EXPRESSIONS, caps);
1293
1294    validator.validate(&module)
1295}
1296
1297#[cfg(test)]
1298/// Validate a module containing the given constant expression, expecting an error.
1299fn validate_with_const_expression(
1300    expr: crate::Expression,
1301    caps: super::Capabilities,
1302) -> Result<ModuleInfo, crate::span::WithSpan<super::ValidationError>> {
1303    use crate::span::Span;
1304
1305    let mut module = crate::Module::default();
1306    module.global_expressions.append(expr, Span::default());
1307
1308    let mut validator = super::Validator::new(super::ValidationFlags::CONSTANTS, caps);
1309
1310    validator.validate(&module)
1311}
1312
1313/// Using F64 in a function's expression arena is forbidden.
1314#[test]
1315fn f64_runtime_literals() {
1316    let result = validate_with_expression(
1317        crate::Expression::Literal(crate::Literal::F64(0.57721_56649)),
1318        super::Capabilities::default(),
1319    );
1320    let error = result.unwrap_err().into_inner();
1321    assert!(matches!(
1322        error,
1323        crate::valid::ValidationError::Function {
1324            source: super::FunctionError::Expression {
1325                source: ExpressionError::Literal(LiteralError::Width(
1326                    super::r#type::WidthError::MissingCapability {
1327                        name: "f64",
1328                        flag: "FLOAT64",
1329                    }
1330                ),),
1331                ..
1332            },
1333            ..
1334        }
1335    ));
1336
1337    let result = validate_with_expression(
1338        crate::Expression::Literal(crate::Literal::F64(0.57721_56649)),
1339        super::Capabilities::default() | super::Capabilities::FLOAT64,
1340    );
1341    assert!(result.is_ok());
1342}
1343
1344/// Using F64 in a module's constant expression arena is forbidden.
1345#[test]
1346fn f64_const_literals() {
1347    let result = validate_with_const_expression(
1348        crate::Expression::Literal(crate::Literal::F64(0.57721_56649)),
1349        super::Capabilities::default(),
1350    );
1351    let error = result.unwrap_err().into_inner();
1352    assert!(matches!(
1353        error,
1354        crate::valid::ValidationError::ConstExpression {
1355            source: ConstExpressionError::Literal(LiteralError::Width(
1356                super::r#type::WidthError::MissingCapability {
1357                    name: "f64",
1358                    flag: "FLOAT64",
1359                }
1360            )),
1361            ..
1362        }
1363    ));
1364
1365    let result = validate_with_const_expression(
1366        crate::Expression::Literal(crate::Literal::F64(0.57721_56649)),
1367        super::Capabilities::default() | super::Capabilities::FLOAT64,
1368    );
1369    assert!(result.is_ok());
1370}
naga/valid/expression.rs

naga/valid/
expression.rs
