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// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_LANG_WGSL_RESOLVER_RESOLVER_H_
#define SRC_TINT_LANG_WGSL_RESOLVER_RESOLVER_H_
#include <memory>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "src/tint/lang/core/constant/value.h"
#include "src/tint/lang/wgsl/program/program_builder.h"
#include "src/tint/lang/wgsl/resolver/const_eval.h"
#include "src/tint/lang/wgsl/resolver/dependency_graph.h"
#include "src/tint/lang/wgsl/resolver/intrinsic_table.h"
#include "src/tint/lang/wgsl/resolver/sem_helper.h"
#include "src/tint/lang/wgsl/resolver/validator.h"
#include "src/tint/lang/wgsl/sem/binding_point.h"
#include "src/tint/lang/wgsl/sem/block_statement.h"
#include "src/tint/lang/wgsl/sem/function.h"
#include "src/tint/lang/wgsl/sem/struct.h"
#include "src/tint/utils/containers/bitset.h"
#include "src/tint/utils/containers/unique_vector.h"
// Forward declarations
namespace tint::ast {
class IndexAccessorExpression;
class BinaryExpression;
class BitcastExpression;
class CallExpression;
class CallStatement;
class CaseStatement;
class ForLoopStatement;
class Function;
class IdentifierExpression;
class LoopStatement;
class MemberAccessorExpression;
class ReturnStatement;
class SwitchStatement;
class UnaryOpExpression;
class Variable;
class WhileStatement;
} // namespace tint::ast
namespace tint::sem {
class Array;
class BlockStatement;
class Builtin;
class CaseStatement;
class ForLoopStatement;
class IfStatement;
class LoopStatement;
class Statement;
class StructMember;
class SwitchStatement;
class WhileStatement;
} // namespace tint::sem
namespace tint::type {
class Atomic;
} // namespace tint::type
namespace tint::resolver {
/// Resolves types for all items in the given tint program
class Resolver {
public:
/// Constructor
/// @param builder the program builder
explicit Resolver(ProgramBuilder* builder);
/// Destructor
~Resolver();
/// @returns error messages from the resolver
std::string error() const { return diagnostics_.str(); }
/// @returns the list of diagnostics raised by the generator.
const diag::List& Diagnostics() const { return diagnostics_; }
/// @returns true if the resolver was successful
bool Resolve();
/// @param type the given type
/// @returns true if the given type is a plain type
bool IsPlain(const type::Type* type) const { return validator_.IsPlain(type); }
/// @param type the given type
/// @returns true if the given type is a fixed-footprint type
bool IsFixedFootprint(const type::Type* type) const {
return validator_.IsFixedFootprint(type);
}
/// @param type the given type
/// @returns true if the given type is storable
bool IsStorable(const type::Type* type) const { return validator_.IsStorable(type); }
/// @param type the given type
/// @returns true if the given type is host-shareable
bool IsHostShareable(const type::Type* type) const { return validator_.IsHostShareable(type); }
/// @returns the validator for testing
const Validator* GetValidatorForTesting() const { return &validator_; }
private:
/// Resolves the program, without creating final the semantic nodes.
/// @returns true on success, false on error
bool ResolveInternal();
/// Creates the nodes and adds them to the sem::Info mappings of the
/// ProgramBuilder.
void CreateSemanticNodes() const;
/// @returns the call of Expression() cast to a sem::ValueExpression. If the sem::Expression is
/// not a sem::ValueExpression, then an error diagnostic is raised and nullptr is returned.
sem::ValueExpression* ValueExpression(const ast::Expression* expr);
/// @returns the call of Expression() cast to a sem::TypeExpression. If the sem::Expression is
/// not a sem::TypeExpression, then an error diagnostic is raised and nullptr is returned.
sem::TypeExpression* TypeExpression(const ast::Expression* expr);
/// @returns the call of Expression() cast to a sem::FunctionExpression. If the sem::Expression
/// is not a sem::FunctionExpression, then an error diagnostic is raised and nullptr is
/// returned.
sem::FunctionExpression* FunctionExpression(const ast::Expression* expr);
/// @returns the resolved type from an expression, or nullptr on error
type::Type* Type(const ast::Expression* ast);
/// @returns the call of Expression() cast to a
/// sem::BuiltinEnumExpression<builtin::AddressSpace>. If the sem::Expression is not a
/// sem::BuiltinEnumExpression<builtin::AddressSpace>, then an error diagnostic is raised and
/// nullptr is returned.
sem::BuiltinEnumExpression<builtin::AddressSpace>* AddressSpaceExpression(
const ast::Expression* expr);
/// @returns the call of Expression() cast to a
/// sem::BuiltinEnumExpression<builtin::BuiltinValue>. If the sem::Expression is not a
/// sem::BuiltinEnumExpression<builtin::BuiltinValue>, then an error diagnostic is raised and
/// nullptr is returned.
sem::BuiltinEnumExpression<builtin::BuiltinValue>* BuiltinValueExpression(
const ast::Expression* expr);
/// @returns the call of Expression() cast to a sem::BuiltinEnumExpression<type::TexelFormat>.
/// If the sem::Expression is not a sem::BuiltinEnumExpression<type::TexelFormat>, then an error
/// diagnostic is raised and nullptr is returned.
sem::BuiltinEnumExpression<builtin::TexelFormat>* TexelFormatExpression(
const ast::Expression* expr);
/// @returns the call of Expression() cast to a sem::BuiltinEnumExpression<builtin::Access>*.
/// If the sem::Expression is not a sem::BuiltinEnumExpression<builtin::Access>*, then an error
/// diagnostic is raised and nullptr is returned.
sem::BuiltinEnumExpression<builtin::Access>* AccessExpression(const ast::Expression* expr);
/// @returns the call of Expression() cast to a
/// sem::BuiltinEnumExpression<builtin::InterpolationSampling>*. If the sem::Expression is not a
/// sem::BuiltinEnumExpression<builtin::InterpolationSampling>*, then an error diagnostic is
/// raised and nullptr is returned.
sem::BuiltinEnumExpression<builtin::InterpolationSampling>* InterpolationSampling(
const ast::Expression* expr);
/// @returns the call of Expression() cast to a
/// sem::BuiltinEnumExpression<builtin::InterpolationType>*. If the sem::Expression is not a
/// sem::BuiltinEnumExpression<builtin::InterpolationType>*, then an error diagnostic is raised
/// and nullptr is returned.
sem::BuiltinEnumExpression<builtin::InterpolationType>* InterpolationType(
const ast::Expression* expr);
/// Expression traverses the graph of expressions starting at `expr`, building a post-ordered
/// list (leaf-first) of all the expression nodes. Each of the expressions are then resolved by
/// dispatching to the appropriate expression handlers below.
/// @returns the resolved semantic node for the expression `expr`, or nullptr on failure.
sem::Expression* Expression(const ast::Expression* expr);
////////////////////////////////////////////////////////////////////////////////////////////////
// Expression resolving methods
//
// Returns the semantic node pointer on success, nullptr on failure.
//
// These methods are invoked by Expression(), in postorder (child-first). These methods should
// not attempt to resolve their children. This design avoids recursion, which is a common cause
// of stack-overflows.
////////////////////////////////////////////////////////////////////////////////////////////////
sem::ValueExpression* IndexAccessor(const ast::IndexAccessorExpression*);
sem::ValueExpression* Binary(const ast::BinaryExpression*);
sem::ValueExpression* Bitcast(const ast::BitcastExpression*);
sem::Call* Call(const ast::CallExpression*);
sem::Function* Function(const ast::Function*);
template <size_t N>
sem::Call* FunctionCall(const ast::CallExpression*,
sem::Function* target,
utils::Vector<const sem::ValueExpression*, N>& args,
sem::Behaviors arg_behaviors);
sem::Expression* Identifier(const ast::IdentifierExpression*);
template <size_t N>
sem::Call* BuiltinCall(const ast::CallExpression*,
builtin::Function,
utils::Vector<const sem::ValueExpression*, N>& args);
sem::ValueExpression* Literal(const ast::LiteralExpression*);
sem::ValueExpression* MemberAccessor(const ast::MemberAccessorExpression*);
sem::ValueExpression* UnaryOp(const ast::UnaryOpExpression*);
/// Register a memory store to an expression, to track accesses to root identifiers in order to
/// perform alias analysis.
void RegisterStore(const sem::ValueExpression* expr);
/// Perform pointer alias analysis for `call`.
/// @returns true is the call arguments are free from aliasing issues, false otherwise.
bool AliasAnalysis(const sem::Call* call);
/// If `expr` is of a reference type, then Load will create and return a sem::Load node wrapping
/// `expr`. If `expr` is not of a reference type, then Load will just return `expr`.
const sem::ValueExpression* Load(const sem::ValueExpression* expr);
/// If `expr` is not of an abstract-numeric type, then Materialize() will just return `expr`.
/// * Materialize will create and return a sem::Materialize node wrapping `expr`.
/// * The AST -> Sem binding will be updated to point to the new sem::Materialize node.
/// * The sem::Materialize node will have a new concrete type, which will be `target_type` if
/// not nullptr, otherwise:
/// * a type with the element type of `i32` (e.g. `i32`, `vec2<i32>`) if `expr` has a
/// element type of abstract-integer...
/// * ... or a type with the element type of `f32` (e.g. `f32`, vec3<f32>`, `mat2x3<f32>`)
/// if `expr` has a element type of abstract-float.
/// * The sem::Materialize constant value will be the value of `expr` value-converted to the
/// materialized type.
/// If `expr` is not of an abstract-numeric type, then Materialize() will just return `expr`.
/// If `expr` is nullptr, then Materialize() will also return nullptr.
const sem::ValueExpression* Materialize(const sem::ValueExpression* expr,
const type::Type* target_type = nullptr);
/// For each argument in `args`:
/// * Calls Materialize() passing the argument and the corresponding parameter type.
/// * Calls Load() passing the argument, iff the corresponding parameter type is not a
/// reference type.
/// @returns true on success, false on failure.
template <size_t N>
bool MaybeMaterializeAndLoadArguments(utils::Vector<const sem::ValueExpression*, N>& args,
const sem::CallTarget* target);
/// @returns true if an argument of an abstract numeric type, passed to a parameter of type
/// `parameter_ty` should be materialized.
bool ShouldMaterializeArgument(const type::Type* parameter_ty) const;
/// Converts `c` to `target_ty`
/// @returns true on success, false on failure.
bool Convert(const constant::Value*& c, const type::Type* target_ty, const Source& source);
/// Transforms `args` to a vector of constants, and converts each constant to the call target's
/// parameter type.
/// @returns the vector of constants, `utils::Failure` on failure.
template <size_t N>
utils::Result<utils::Vector<const constant::Value*, N>> ConvertArguments(
const utils::Vector<const sem::ValueExpression*, N>& args,
const sem::CallTarget* target);
/// @param ty the type that may hold abstract numeric types
/// @param target_ty the target type for the expression (variable type, parameter type, etc).
/// May be nullptr.
/// @param source the source of the expression requiring materialization
/// @returns the concrete (materialized) type for the given type, or nullptr if the type is
/// already concrete.
const type::Type* ConcreteType(const type::Type* ty,
const type::Type* target_ty,
const Source& source);
// Statement resolving methods
// Each return true on success, false on failure.
sem::Statement* AssignmentStatement(const ast::AssignmentStatement*);
sem::BlockStatement* BlockStatement(const ast::BlockStatement*);
sem::Statement* BreakStatement(const ast::BreakStatement*);
sem::Statement* BreakIfStatement(const ast::BreakIfStatement*);
sem::Statement* CallStatement(const ast::CallStatement*);
sem::CaseStatement* CaseStatement(const ast::CaseStatement*, const type::Type*);
sem::Statement* CompoundAssignmentStatement(const ast::CompoundAssignmentStatement*);
sem::Statement* ContinueStatement(const ast::ContinueStatement*);
sem::Statement* ConstAssert(const ast::ConstAssert*);
sem::Statement* DiscardStatement(const ast::DiscardStatement*);
sem::ForLoopStatement* ForLoopStatement(const ast::ForLoopStatement*);
sem::WhileStatement* WhileStatement(const ast::WhileStatement*);
sem::GlobalVariable* GlobalVariable(const ast::Variable*);
sem::Statement* Parameter(const ast::Variable*);
sem::IfStatement* IfStatement(const ast::IfStatement*);
sem::Statement* IncrementDecrementStatement(const ast::IncrementDecrementStatement*);
sem::LoopStatement* LoopStatement(const ast::LoopStatement*);
sem::Statement* ReturnStatement(const ast::ReturnStatement*);
sem::Statement* Statement(const ast::Statement*);
sem::SwitchStatement* SwitchStatement(const ast::SwitchStatement* s);
sem::Statement* VariableDeclStatement(const ast::VariableDeclStatement*);
bool Statements(utils::VectorRef<const ast::Statement*>);
// CollectTextureSamplerPairs() collects all the texture/sampler pairs from the target function
// / builtin, and records these on the current function by calling AddTextureSamplerPair().
void CollectTextureSamplerPairs(sem::Function* func,
utils::VectorRef<const sem::ValueExpression*> args) const;
void CollectTextureSamplerPairs(const sem::Builtin* builtin,
utils::VectorRef<const sem::ValueExpression*> args) const;
/// Resolves the WorkgroupSize for the given function, assigning it to
/// current_function_
bool WorkgroupSize(const ast::Function*);
/// Resolves the `@builtin` attribute @p attr
/// @returns the builtin value on success
utils::Result<tint::builtin::BuiltinValue> BuiltinAttribute(const ast::BuiltinAttribute* attr);
/// Resolves the `@location` attribute @p attr
/// @returns the location value on success.
utils::Result<uint32_t> LocationAttribute(const ast::LocationAttribute* attr);
/// Resolves the `@index` attribute @p attr
/// @returns the index value on success.
utils::Result<uint32_t> IndexAttribute(const ast::IndexAttribute* attr);
/// Resolves the `@binding` attribute @p attr
/// @returns the binding value on success.
utils::Result<uint32_t> BindingAttribute(const ast::BindingAttribute* attr);
/// Resolves the `@group` attribute @p attr
/// @returns the group value on success.
utils::Result<uint32_t> GroupAttribute(const ast::GroupAttribute* attr);
/// Resolves the `@workgroup_size` attribute @p attr
/// @returns the workgroup size on success.
utils::Result<sem::WorkgroupSize> WorkgroupAttribute(const ast::WorkgroupAttribute* attr);
/// Resolves the `@diagnostic` attribute @p attr
/// @returns true on success, false on failure
bool DiagnosticAttribute(const ast::DiagnosticAttribute* attr);
/// Resolves the stage attribute @p attr
/// @returns true on success, false on failure
bool StageAttribute(const ast::StageAttribute* attr);
/// Resolves the `@must_use` attribute @p attr
/// @returns true on success, false on failure
bool MustUseAttribute(const ast::MustUseAttribute* attr);
/// Resolves the `@invariant` attribute @p attr
/// @returns true on success, false on failure
bool InvariantAttribute(const ast::InvariantAttribute*);
/// Resolves the `@stride` attribute @p attr
/// @returns true on success, false on failure
bool StrideAttribute(const ast::StrideAttribute*);
/// Resolves the `@interpolate` attribute @p attr
/// @returns true on success, false on failure
utils::Result<builtin::Interpolation> InterpolateAttribute(
const ast::InterpolateAttribute* attr);
/// Resolves the internal attribute @p attr
/// @returns true on success, false on failure
bool InternalAttribute(const ast::InternalAttribute* attr);
/// @param control the diagnostic control
/// @returns true on success, false on failure
bool DiagnosticControl(const ast::DiagnosticControl& control);
/// @param enable the enable declaration
/// @returns the resolved extension
bool Enable(const ast::Enable* enable);
/// @param named_type the named type to resolve
/// @returns the resolved semantic type
type::Type* TypeDecl(const ast::TypeDecl* named_type);
/// Resolves and validates the expression used as the count parameter of an array.
/// @param count_expr the expression used as the second template parameter to an array<>.
/// @returns the number of elements in the array.
const type::ArrayCount* ArrayCount(const ast::Expression* count_expr);
/// Resolves and validates the attributes on an array.
/// @param attributes the attributes on the array type.
/// @param el_ty the element type of the array.
/// @param explicit_stride assigned the specified stride of the array in bytes.
/// @returns true on success, false on failure
bool ArrayAttributes(utils::VectorRef<const ast::Attribute*> attributes,
const type::Type* el_ty,
uint32_t& explicit_stride);
/// Builds and returns the semantic information for an array.
/// @returns the semantic Array information, or nullptr if an error is raised.
/// @param array_source the source of the array
/// @param el_source the source of the array element, or the array if the array does not have a
/// locally-declared element AST node.
/// @param count_source the source of the array count, or the array if the array does not have a
/// locally-declared element AST node.
/// @param el_ty the Array element type
/// @param el_count the number of elements in the array.
/// @param explicit_stride the explicit byte stride of the array. Zero means implicit stride.
type::Array* Array(const Source& array_source,
const Source& el_source,
const Source& count_source,
const type::Type* el_ty,
const type::ArrayCount* el_count,
uint32_t explicit_stride);
/// Builds and returns the semantic information for the alias `alias`.
/// This method does not mark the ast::Alias node, nor attach the generated
/// semantic information to the AST node.
/// @returns the aliased type, or nullptr if an error is raised.
type::Type* Alias(const ast::Alias* alias);
/// Builds and returns the semantic information for the structure `str`.
/// This method does not mark the ast::Struct node, nor attach the generated
/// semantic information to the AST node.
/// @returns the semantic Struct information, or nullptr if an error is
/// raised.
sem::Struct* Structure(const ast::Struct* str);
/// @returns the semantic info for the variable `v`. If an error is raised, nullptr is
/// returned.
/// @note this method does not resolve the attributes as these are context-dependent (global,
/// local)
/// @param var the variable
/// @param is_global true if this is module scope, otherwise function scope
sem::Variable* Variable(const ast::Variable* var, bool is_global);
/// @returns the semantic info for the `ast::Let` `v`. If an error is raised, nullptr is
/// returned.
/// @note this method does not resolve the attributes as these are context-dependent (global,
/// local)
/// @param var the variable
/// @param is_global true if this is module scope, otherwise function scope
sem::Variable* Let(const ast::Let* var, bool is_global);
/// @returns the semantic info for the module-scope `ast::Override` `v`. If an error is raised,
/// nullptr is returned.
/// @note this method does not resolve the attributes as these are context-dependent (global,
/// local)
/// @param override the variable
sem::Variable* Override(const ast::Override* override);
/// @returns the semantic info for an `ast::Const` `v`. If an error is raised, nullptr is
/// returned.
/// @note this method does not resolve the attributes as these are context-dependent (global,
/// local)
/// @param const_ the variable
/// @param is_global true if this is module scope, otherwise function scope
sem::Variable* Const(const ast::Const* const_, bool is_global);
/// @returns the semantic info for the `ast::Var` `var`. If an error is raised, nullptr is
/// returned.
/// @note this method does not resolve the attributes as these are context-dependent (global,
/// local)
/// @param var the variable
/// @param is_global true if this is module scope, otherwise function scope
sem::Variable* Var(const ast::Var* var, bool is_global);
/// @returns the semantic info for the function parameter `param`. If an error is raised,
/// nullptr is returned.
/// @note the caller is expected to validate the parameter
/// @param param the AST parameter
/// @param func the AST function that owns the parameter
/// @param index the index of the parameter
sem::Parameter* Parameter(const ast::Parameter* param,
const ast::Function* func,
uint32_t index);
/// Records the address space usage for the given type, and any transient
/// dependencies of the type. Validates that the type can be used for the
/// given address space, erroring if it cannot.
/// @param sc the address space to apply to the type and transitent types
/// @param ty the type to apply the address space on
/// @param usage the Source of the root variable declaration that uses the
/// given type and address space. Used for generating sensible error
/// messages.
/// @returns true on success, false on error
bool ApplyAddressSpaceUsageToType(builtin::AddressSpace sc,
type::Type* ty,
const Source& usage);
/// @param address_space the address space
/// @returns the default access control for the given address space
builtin::Access DefaultAccessForAddressSpace(builtin::AddressSpace address_space);
/// Allocate constant IDs for pipeline-overridable constants.
/// @returns true on success, false on error
bool AllocateOverridableConstantIds();
/// Set the shadowing information on variable declarations.
/// @note this method must only be called after all semantic nodes are built.
void SetShadows();
/// StatementScope() does the following:
/// * Creates the AST -> SEM mapping.
/// * Assigns `sem` to #current_statement_
/// * Assigns `sem` to #current_compound_statement_ if `sem` derives from
/// sem::CompoundStatement.
/// * Then calls `callback`.
/// * Before returning #current_statement_ and #current_compound_statement_ are restored to
/// their original values.
/// @returns `sem` if `callback` returns true, otherwise `nullptr`.
template <typename SEM, typename F>
SEM* StatementScope(const ast::Statement* ast, SEM* sem, F&& callback);
/// Mark records that the given AST node has been visited, and asserts that
/// the given node has not already been seen. Diamonds in the AST are
/// illegal.
/// @param node the AST node.
/// @returns true on success, false on error
bool Mark(const ast::Node* node);
/// Applies the diagnostic severities from the current scope to a semantic node.
/// @param node the semantic node to apply the diagnostic severities to
template <typename NODE>
void ApplyDiagnosticSeverities(NODE* node);
/// Checks @p ident is not an ast::TemplatedIdentifier.
/// If @p ident is a ast::TemplatedIdentifier, then an error diagnostic is raised.
/// @returns true if @p ident is not a ast::TemplatedIdentifier.
bool CheckNotTemplated(const char* use, const ast::Identifier* ident);
/// Raises an error diagnostic that the resolved identifier @p resolved was not of the expected
/// kind.
/// @param source the source of the error diagnostic
/// @param resolved the resolved identifier
/// @param wanted the expected kind
void ErrorMismatchedResolvedIdentifier(const Source& source,
const ResolvedIdentifier& resolved,
std::string_view wanted);
/// Raises an error that the attribute is not valid for the given use.
/// @param attr the invalue attribute
/// @param use the thing that the attribute was applied to
void ErrorInvalidAttribute(const ast::Attribute* attr, std::string_view use);
/// Adds the given error message to the diagnostics
void AddError(const std::string& msg, const Source& source) const;
/// Adds the given warning message to the diagnostics
void AddWarning(const std::string& msg, const Source& source) const;
/// Adds the given note message to the diagnostics
void AddNote(const std::string& msg, const Source& source) const;
/// @returns the type::Type for the builtin type @p builtin_ty with the identifier @p ident
/// @note: Will raise an ICE if @p symbol is not a builtin type.
type::Type* BuiltinType(builtin::Builtin builtin_ty, const ast::Identifier* ident);
/// @returns the nesting depth of @ty as defined in
/// https://gpuweb.github.io/gpuweb/wgsl/#composite-types
size_t NestDepth(const type::Type* ty) const;
// ArrayConstructorSig represents a unique array constructor signature.
// It is a tuple of the array type, number of arguments provided and earliest evaluation stage.
using ArrayConstructorSig =
utils::UnorderedKeyWrapper<std::tuple<const type::Array*, size_t, sem::EvaluationStage>>;
// StructConstructorSig represents a unique structure constructor signature.
// It is a tuple of the structure type, number of arguments provided and earliest evaluation
// stage.
using StructConstructorSig =
utils::UnorderedKeyWrapper<std::tuple<const type::Struct*, size_t, sem::EvaluationStage>>;
/// ExprEvalStageConstraint describes a constraint on when expressions can be evaluated.
struct ExprEvalStageConstraint {
/// The latest stage that the expression can be evaluated
sem::EvaluationStage stage = sem::EvaluationStage::kRuntime;
/// The 'thing' that is imposing the contraint. e.g. "var declaration"
/// If nullptr, then there is no constraint
const char* constraint = nullptr;
};
/// AliasAnalysisInfo captures the memory accesses performed by a given function for the purpose
/// of determining if any two arguments alias at any callsite.
struct AliasAnalysisInfo {
/// The set of module-scope variables that are written to, and where that write occurs.
std::unordered_map<const sem::Variable*, const sem::ValueExpression*> module_scope_writes;
/// The set of module-scope variables that are read from, and where that read occurs.
std::unordered_map<const sem::Variable*, const sem::ValueExpression*> module_scope_reads;
/// The set of function parameters that are written to.
std::unordered_set<const sem::Variable*> parameter_writes;
/// The set of function parameters that are read from.
std::unordered_set<const sem::Variable*> parameter_reads;
};
/// A hint for the usage of an identifier expression.
/// Used to provide more informative error diagnostics on resolution failure.
struct IdentifierResolveHint {
/// The expression this hint applies to
const ast::Expression* expression = nullptr;
/// The usage of the identifier.
const char* usage = "identifier";
/// Suggested strings if the identifier failed to resolve
utils::Slice<char const* const> suggestions = utils::Empty;
};
ProgramBuilder* const builder_;
diag::List& diagnostics_;
ConstEval const_eval_;
std::unique_ptr<IntrinsicTable> const intrinsic_table_;
DependencyGraph dependencies_;
SemHelper sem_;
Validator validator_;
builtin::Extensions enabled_extensions_;
utils::Vector<sem::Function*, 8> entry_points_;
utils::Hashmap<const type::Type*, const Source*, 8> atomic_composite_info_;
utils::Bitset<0> marked_;
ExprEvalStageConstraint expr_eval_stage_constraint_;
std::unordered_map<const sem::Function*, AliasAnalysisInfo> alias_analysis_infos_;
utils::Hashmap<OverrideId, const sem::Variable*, 8> override_ids_;
utils::Hashmap<ArrayConstructorSig, sem::CallTarget*, 8> array_ctors_;
utils::Hashmap<StructConstructorSig, sem::CallTarget*, 8> struct_ctors_;
sem::Function* current_function_ = nullptr;
sem::Statement* current_statement_ = nullptr;
sem::CompoundStatement* current_compound_statement_ = nullptr;
uint32_t current_scoping_depth_ = 0;
utils::UniqueVector<const sem::GlobalVariable*, 4>* resolved_overrides_ = nullptr;
utils::Hashset<TypeAndAddressSpace, 8> valid_type_storage_layouts_;
utils::Hashmap<const ast::Expression*, const ast::BinaryExpression*, 8>
logical_binary_lhs_to_parent_;
utils::Hashset<const ast::Expression*, 8> skip_const_eval_;
IdentifierResolveHint identifier_resolve_hint_;
utils::Hashmap<const type::Type*, size_t, 8> nest_depth_;
};
} // namespace tint::resolver
#endif // SRC_TINT_LANG_WGSL_RESOLVER_RESOLVER_H_