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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.
#include "src/tint/resolver/resolver.h"
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <limits>
#include <utility>
#include "src/tint/ast/alias.h"
#include "src/tint/ast/assignment_statement.h"
#include "src/tint/ast/attribute.h"
#include "src/tint/ast/bitcast_expression.h"
#include "src/tint/ast/break_statement.h"
#include "src/tint/ast/call_statement.h"
#include "src/tint/ast/continue_statement.h"
#include "src/tint/ast/disable_validation_attribute.h"
#include "src/tint/ast/discard_statement.h"
#include "src/tint/ast/for_loop_statement.h"
#include "src/tint/ast/id_attribute.h"
#include "src/tint/ast/if_statement.h"
#include "src/tint/ast/internal_attribute.h"
#include "src/tint/ast/interpolate_attribute.h"
#include "src/tint/ast/loop_statement.h"
#include "src/tint/ast/return_statement.h"
#include "src/tint/ast/switch_statement.h"
#include "src/tint/ast/traverse_expressions.h"
#include "src/tint/ast/unary_op_expression.h"
#include "src/tint/ast/variable_decl_statement.h"
#include "src/tint/ast/while_statement.h"
#include "src/tint/ast/workgroup_attribute.h"
#include "src/tint/builtin/builtin.h"
#include "src/tint/resolver/uniformity.h"
#include "src/tint/sem/break_if_statement.h"
#include "src/tint/sem/builtin_enum_expression.h"
#include "src/tint/sem/call.h"
#include "src/tint/sem/for_loop_statement.h"
#include "src/tint/sem/function.h"
#include "src/tint/sem/function_expression.h"
#include "src/tint/sem/if_statement.h"
#include "src/tint/sem/index_accessor_expression.h"
#include "src/tint/sem/load.h"
#include "src/tint/sem/loop_statement.h"
#include "src/tint/sem/materialize.h"
#include "src/tint/sem/member_accessor_expression.h"
#include "src/tint/sem/module.h"
#include "src/tint/sem/statement.h"
#include "src/tint/sem/struct.h"
#include "src/tint/sem/switch_statement.h"
#include "src/tint/sem/type_expression.h"
#include "src/tint/sem/value_constructor.h"
#include "src/tint/sem/value_conversion.h"
#include "src/tint/sem/variable.h"
#include "src/tint/sem/while_statement.h"
#include "src/tint/type/abstract_float.h"
#include "src/tint/type/abstract_int.h"
#include "src/tint/type/array.h"
#include "src/tint/type/atomic.h"
#include "src/tint/type/depth_multisampled_texture.h"
#include "src/tint/type/depth_texture.h"
#include "src/tint/type/external_texture.h"
#include "src/tint/type/multisampled_texture.h"
#include "src/tint/type/pointer.h"
#include "src/tint/type/reference.h"
#include "src/tint/type/sampled_texture.h"
#include "src/tint/type/sampler.h"
#include "src/tint/type/storage_texture.h"
#include "src/tint/utils/compiler_macros.h"
#include "src/tint/utils/defer.h"
#include "src/tint/utils/math.h"
#include "src/tint/utils/reverse.h"
#include "src/tint/utils/scoped_assignment.h"
#include "src/tint/utils/string.h"
#include "src/tint/utils/string_stream.h"
#include "src/tint/utils/transform.h"
#include "src/tint/utils/vector.h"
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::Access>);
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::AddressSpace>);
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::BuiltinValue>);
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::InterpolationSampling>);
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::InterpolationType>);
TINT_INSTANTIATE_TYPEINFO(tint::sem::BuiltinEnumExpression<tint::builtin::TexelFormat>);
namespace tint::resolver {
namespace {
constexpr int64_t kMaxArrayElementCount = 65536;
constexpr uint32_t kMaxStatementDepth = 127;
constexpr size_t kMaxNestDepthOfCompositeType = 255;
} // namespace
Resolver::Resolver(ProgramBuilder* builder)
: builder_(builder),
diagnostics_(builder->Diagnostics()),
const_eval_(*builder),
intrinsic_table_(IntrinsicTable::Create(*builder)),
sem_(builder),
validator_(builder,
sem_,
enabled_extensions_,
atomic_composite_info_,
valid_type_storage_layouts_) {}
Resolver::~Resolver() = default;
bool Resolver::Resolve() {
if (diagnostics_.contains_errors()) {
return false;
}
builder_->Sem().Reserve(builder_->LastAllocatedNodeID());
// Pre-allocate the marked bitset with the total number of AST nodes.
marked_.Resize(builder_->ASTNodes().Count());
if (!DependencyGraph::Build(builder_->AST(), builder_->Symbols(), diagnostics_,
dependencies_)) {
return false;
}
bool result = ResolveInternal();
if (TINT_UNLIKELY(!result && !diagnostics_.contains_errors())) {
TINT_ICE(Resolver, diagnostics_) << "resolving failed, but no error was raised";
return false;
}
// Create the semantic module.
auto* mod = builder_->create<sem::Module>(std::move(dependencies_.ordered_globals),
std::move(enabled_extensions_));
ApplyDiagnosticSeverities(mod);
builder_->Sem().SetModule(mod);
if (result) {
// Run the uniformity analysis, which requires a complete semantic module.
if (!enabled_extensions_.Contains(builtin::Extension::kChromiumDisableUniformityAnalysis)) {
if (!AnalyzeUniformity(builder_, dependencies_)) {
return false;
}
}
}
return result;
}
bool Resolver::ResolveInternal() {
Mark(&builder_->AST());
// Process all module-scope declarations in dependency order.
utils::Vector<const ast::DiagnosticControl*, 4> diagnostic_controls;
for (auto* decl : dependencies_.ordered_globals) {
Mark(decl);
if (!Switch<bool>(
decl, //
[&](const ast::DiagnosticDirective* d) {
diagnostic_controls.Push(&d->control);
return DiagnosticControl(d->control);
},
[&](const ast::Enable* e) { return Enable(e); },
[&](const ast::TypeDecl* td) { return TypeDecl(td); },
[&](const ast::Function* func) { return Function(func); },
[&](const ast::Variable* var) { return GlobalVariable(var); },
[&](const ast::ConstAssert* ca) { return ConstAssert(ca); },
[&](Default) {
TINT_UNREACHABLE(Resolver, diagnostics_)
<< "unhandled global declaration: " << decl->TypeInfo().name;
return false;
})) {
return false;
}
}
if (!AllocateOverridableConstantIds()) {
return false;
}
SetShadows();
if (!validator_.DiagnosticControls(diagnostic_controls, "directive")) {
return false;
}
if (!validator_.PipelineStages(entry_points_)) {
return false;
}
if (!validator_.PushConstants(entry_points_)) {
return false;
}
bool result = true;
for (auto* node : builder_->ASTNodes().Objects()) {
if (TINT_UNLIKELY(!marked_[node->node_id.value])) {
TINT_ICE(Resolver, diagnostics_)
<< "AST node '" << node->TypeInfo().name << "' was not reached by the resolver\n"
<< "At: " << node->source << "\n"
<< "Pointer: " << node;
result = false;
}
}
return result;
}
sem::Variable* Resolver::Variable(const ast::Variable* v, bool is_global) {
Mark(v->name);
return Switch(
v, //
[&](const ast::Var* var) { return Var(var, is_global); },
[&](const ast::Let* let) { return Let(let, is_global); },
[&](const ast::Override* override) { return Override(override); },
[&](const ast::Const* const_) { return Const(const_, is_global); },
[&](Default) {
TINT_ICE(Resolver, diagnostics_)
<< "Resolver::GlobalVariable() called with a unknown variable type: "
<< v->TypeInfo().name;
return nullptr;
});
}
sem::Variable* Resolver::Let(const ast::Let* v, bool is_global) {
const type::Type* ty = nullptr;
// If the variable has a declared type, resolve it.
if (v->type) {
ty = Type(v->type);
if (!ty) {
return nullptr;
}
}
if (!v->initializer) {
AddError("'let' declaration must have an initializer", v->source);
return nullptr;
}
auto* rhs = Load(Materialize(ValueExpression(v->initializer), ty));
if (!rhs) {
return nullptr;
}
// If the variable has no declared type, infer it from the RHS
if (!ty) {
ty = rhs->Type()->UnwrapRef(); // Implicit load of RHS
}
if (rhs && !validator_.VariableInitializer(v, ty, rhs)) {
return nullptr;
}
if (!ApplyAddressSpaceUsageToType(builtin::AddressSpace::kUndefined,
const_cast<type::Type*>(ty), v->source)) {
AddNote("while instantiating 'let' " + builder_->Symbols().NameFor(v->name->symbol),
v->source);
return nullptr;
}
sem::Variable* sem = nullptr;
if (is_global) {
sem = builder_->create<sem::GlobalVariable>(
v, ty, sem::EvaluationStage::kRuntime, builtin::AddressSpace::kUndefined,
builtin::Access::kUndefined,
/* constant_value */ nullptr, sem::BindingPoint{}, std::nullopt);
} else {
sem = builder_->create<sem::LocalVariable>(v, ty, sem::EvaluationStage::kRuntime,
builtin::AddressSpace::kUndefined,
builtin::Access::kUndefined, current_statement_,
/* constant_value */ nullptr);
}
sem->SetInitializer(rhs);
builder_->Sem().Add(v, sem);
return sem;
}
sem::Variable* Resolver::Override(const ast::Override* v) {
const type::Type* ty = nullptr;
// If the variable has a declared type, resolve it.
if (v->type) {
ty = Type(v->type);
if (!ty) {
return nullptr;
}
}
const sem::ValueExpression* rhs = nullptr;
// Does the variable have an initializer?
if (v->initializer) {
// Note: RHS must be a const or override expression, which excludes references.
// So there's no need to load or unwrap references here.
ExprEvalStageConstraint constraint{sem::EvaluationStage::kOverride, "override initializer"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
rhs = Materialize(ValueExpression(v->initializer), ty);
if (!rhs) {
return nullptr;
}
// If the variable has no declared type, infer it from the RHS
if (!ty) {
ty = rhs->Type();
}
} else if (!ty) {
AddError("override declaration requires a type or initializer", v->source);
return nullptr;
}
if (rhs && !validator_.VariableInitializer(v, ty, rhs)) {
return nullptr;
}
if (!ApplyAddressSpaceUsageToType(builtin::AddressSpace::kUndefined,
const_cast<type::Type*>(ty), v->source)) {
AddNote("while instantiating 'override' " + builder_->Symbols().NameFor(v->name->symbol),
v->source);
return nullptr;
}
auto* sem = builder_->create<sem::GlobalVariable>(
v, ty, sem::EvaluationStage::kOverride, builtin::AddressSpace::kUndefined,
builtin::Access::kUndefined,
/* constant_value */ nullptr, sem::BindingPoint{}, std::nullopt);
sem->SetInitializer(rhs);
if (auto* id_attr = ast::GetAttribute<ast::IdAttribute>(v->attributes)) {
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@id"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* materialized = Materialize(ValueExpression(id_attr->expr));
if (!materialized) {
return nullptr;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("@id must be an i32 or u32 value", id_attr->source);
return nullptr;
}
auto const_value = materialized->ConstantValue();
auto value = const_value->ValueAs<AInt>();
if (value < 0) {
AddError("@id value must be non-negative", id_attr->source);
return nullptr;
}
if (value > std::numeric_limits<decltype(OverrideId::value)>::max()) {
AddError("@id value must be between 0 and " +
std::to_string(std::numeric_limits<decltype(OverrideId::value)>::max()),
id_attr->source);
return nullptr;
}
auto o = OverrideId{static_cast<decltype(OverrideId::value)>(value)};
sem->SetOverrideId(o);
// Track the constant IDs that are specified in the shader.
override_ids_.Add(o, sem);
}
builder_->Sem().Add(v, sem);
return sem;
}
sem::Variable* Resolver::Const(const ast::Const* c, bool is_global) {
const type::Type* ty = nullptr;
// If the variable has a declared type, resolve it.
if (c->type) {
ty = Type(c->type);
if (!ty) {
return nullptr;
}
}
if (!c->initializer) {
AddError("'const' declaration must have an initializer", c->source);
return nullptr;
}
const sem::ValueExpression* rhs = nullptr;
{
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "const initializer"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
rhs = ValueExpression(c->initializer);
if (!rhs) {
return nullptr;
}
}
// Note: RHS must be a const expression, which excludes references.
// So there's no need to load or unwrap references here.
if (ty) {
// If an explicit type was specified, materialize to that type
rhs = Materialize(rhs, ty);
if (!rhs) {
return nullptr;
}
} else {
// If no type was specified, infer it from the RHS
ty = rhs->Type();
}
if (!validator_.VariableInitializer(c, ty, rhs)) {
return nullptr;
}
if (!ApplyAddressSpaceUsageToType(builtin::AddressSpace::kUndefined,
const_cast<type::Type*>(ty), c->source)) {
AddNote("while instantiating 'const' " + builder_->Symbols().NameFor(c->name->symbol),
c->source);
return nullptr;
}
const auto value = rhs->ConstantValue();
auto* sem = is_global
? static_cast<sem::Variable*>(builder_->create<sem::GlobalVariable>(
c, ty, sem::EvaluationStage::kConstant, builtin::AddressSpace::kUndefined,
builtin::Access::kUndefined, value, sem::BindingPoint{}, std::nullopt))
: static_cast<sem::Variable*>(builder_->create<sem::LocalVariable>(
c, ty, sem::EvaluationStage::kConstant, builtin::AddressSpace::kUndefined,
builtin::Access::kUndefined, current_statement_, value));
sem->SetInitializer(rhs);
builder_->Sem().Add(c, sem);
return sem;
}
sem::Variable* Resolver::Var(const ast::Var* var, bool is_global) {
const type::Type* storage_ty = nullptr;
// If the variable has a declared type, resolve it.
if (auto ty = var->type) {
storage_ty = Type(ty);
if (!storage_ty) {
return nullptr;
}
}
const sem::ValueExpression* rhs = nullptr;
// Does the variable have a initializer?
if (var->initializer) {
ExprEvalStageConstraint constraint{
is_global ? sem::EvaluationStage::kOverride : sem::EvaluationStage::kRuntime,
"var initializer",
};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
rhs = Load(Materialize(ValueExpression(var->initializer), storage_ty));
if (!rhs) {
return nullptr;
}
// If the variable has no declared type, infer it from the RHS
if (!storage_ty) {
storage_ty = rhs->Type();
}
}
if (!storage_ty) {
AddError("var declaration requires a type or initializer", var->source);
return nullptr;
}
auto address_space = builtin::AddressSpace::kUndefined;
if (var->declared_address_space) {
auto expr = AddressSpaceExpression(var->declared_address_space);
if (!expr) {
return nullptr;
}
address_space = expr->Value();
} else {
// No declared address space. Infer from usage / type.
if (!is_global) {
address_space = builtin::AddressSpace::kFunction;
} else if (storage_ty->UnwrapRef()->is_handle()) {
// https://gpuweb.github.io/gpuweb/wgsl/#module-scope-variables
// If the store type is a texture type or a sampler type, then the
// variable declaration must not have a address space attribute. The
// address space will always be handle.
address_space = builtin::AddressSpace::kHandle;
}
}
if (!is_global && address_space != builtin::AddressSpace::kFunction &&
validator_.IsValidationEnabled(var->attributes,
ast::DisabledValidation::kIgnoreAddressSpace)) {
AddError("function-scope 'var' declaration must use 'function' address space", var->source);
return nullptr;
}
auto access = builtin::Access::kUndefined;
if (var->declared_access) {
auto expr = AccessExpression(var->declared_access);
if (!expr) {
return nullptr;
}
access = expr->Value();
} else {
access = DefaultAccessForAddressSpace(address_space);
}
if (rhs && !validator_.VariableInitializer(var, storage_ty, rhs)) {
return nullptr;
}
auto* var_ty = builder_->create<type::Reference>(storage_ty, address_space, access);
if (!ApplyAddressSpaceUsageToType(address_space, var_ty,
var->type ? var->type->source : var->source)) {
AddNote("while instantiating 'var' " + builder_->Symbols().NameFor(var->name->symbol),
var->source);
return nullptr;
}
sem::Variable* sem = nullptr;
if (is_global) {
sem::BindingPoint binding_point;
if (var->HasBindingPoint()) {
uint32_t binding = 0;
{
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@binding"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* attr = ast::GetAttribute<ast::BindingAttribute>(var->attributes);
auto* materialized = Materialize(ValueExpression(attr->expr));
if (!materialized) {
return nullptr;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("@binding must be an i32 or u32 value", attr->source);
return nullptr;
}
auto const_value = materialized->ConstantValue();
auto value = const_value->ValueAs<AInt>();
if (value < 0) {
AddError("@binding value must be non-negative", attr->source);
return nullptr;
}
binding = u32(value);
}
uint32_t group = 0;
{
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@group"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* attr = ast::GetAttribute<ast::GroupAttribute>(var->attributes);
auto* materialized = Materialize(ValueExpression(attr->expr));
if (!materialized) {
return nullptr;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("@group must be an i32 or u32 value", attr->source);
return nullptr;
}
auto const_value = materialized->ConstantValue();
auto value = const_value->ValueAs<AInt>();
if (value < 0) {
AddError("@group value must be non-negative", attr->source);
return nullptr;
}
group = u32(value);
}
binding_point = {group, binding};
}
std::optional<uint32_t> location;
if (auto* attr = ast::GetAttribute<ast::LocationAttribute>(var->attributes)) {
auto value = LocationAttribute(attr);
if (!value) {
return nullptr;
}
location = value.Get();
}
sem = builder_->create<sem::GlobalVariable>(
var, var_ty, sem::EvaluationStage::kRuntime, address_space, access,
/* constant_value */ nullptr, binding_point, location);
} else {
sem = builder_->create<sem::LocalVariable>(var, var_ty, sem::EvaluationStage::kRuntime,
address_space, access, current_statement_,
/* constant_value */ nullptr);
}
sem->SetInitializer(rhs);
builder_->Sem().Add(var, sem);
return sem;
}
sem::Parameter* Resolver::Parameter(const ast::Parameter* param, uint32_t index) {
Mark(param->name);
auto add_note = [&] {
AddNote("while instantiating parameter " + builder_->Symbols().NameFor(param->name->symbol),
param->source);
};
for (auto* attr : param->attributes) {
if (!Attribute(attr)) {
return nullptr;
}
}
if (!validator_.NoDuplicateAttributes(param->attributes)) {
return nullptr;
}
type::Type* ty = Type(param->type);
if (!ty) {
return nullptr;
}
if (!ApplyAddressSpaceUsageToType(builtin::AddressSpace::kUndefined, ty, param->type->source)) {
add_note();
return nullptr;
}
if (auto* ptr = ty->As<type::Pointer>()) {
// For MSL, we push module-scope variables into the entry point as pointer
// parameters, so we also need to handle their store type.
if (!ApplyAddressSpaceUsageToType(
ptr->AddressSpace(), const_cast<type::Type*>(ptr->StoreType()), param->source)) {
add_note();
return nullptr;
}
}
sem::BindingPoint binding_point;
if (param->HasBindingPoint()) {
{
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@binding value"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* attr = ast::GetAttribute<ast::BindingAttribute>(param->attributes);
auto* materialized = Materialize(ValueExpression(attr->expr));
if (!materialized) {
return nullptr;
}
binding_point.binding = materialized->ConstantValue()->ValueAs<u32>();
}
{
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@group value"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* attr = ast::GetAttribute<ast::GroupAttribute>(param->attributes);
auto* materialized = Materialize(ValueExpression(attr->expr));
if (!materialized) {
return nullptr;
}
binding_point.group = materialized->ConstantValue()->ValueAs<u32>();
}
}
std::optional<uint32_t> location;
if (auto* attr = ast::GetAttribute<ast::LocationAttribute>(param->attributes)) {
auto value = LocationAttribute(attr);
if (!value) {
return nullptr;
}
location = value.Get();
}
auto* sem = builder_->create<sem::Parameter>(
param, index, ty, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined,
sem::ParameterUsage::kNone, binding_point, location);
builder_->Sem().Add(param, sem);
return sem;
}
utils::Result<uint32_t> Resolver::LocationAttribute(const ast::LocationAttribute* attr) {
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@location value"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* materialized = Materialize(ValueExpression(attr->expr));
if (!materialized) {
return utils::Failure;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("@location must be an i32 or u32 value", attr->source);
return utils::Failure;
}
auto const_value = materialized->ConstantValue();
auto value = const_value->ValueAs<AInt>();
if (value < 0) {
AddError("@location value must be non-negative", attr->source);
return utils::Failure;
}
return static_cast<uint32_t>(value);
}
builtin::Access Resolver::DefaultAccessForAddressSpace(builtin::AddressSpace address_space) {
// https://gpuweb.github.io/gpuweb/wgsl/#storage-class
switch (address_space) {
case builtin::AddressSpace::kStorage:
case builtin::AddressSpace::kUniform:
case builtin::AddressSpace::kHandle:
return builtin::Access::kRead;
default:
break;
}
return builtin::Access::kReadWrite;
}
bool Resolver::AllocateOverridableConstantIds() {
constexpr size_t kLimit = std::numeric_limits<decltype(OverrideId::value)>::max();
// The next pipeline constant ID to try to allocate.
OverrideId next_id;
bool ids_exhausted = false;
auto increment_next_id = [&] {
if (next_id.value == kLimit) {
ids_exhausted = true;
} else {
next_id.value = next_id.value + 1;
}
};
// Allocate constant IDs in global declaration order, so that they are
// deterministic.
// TODO(crbug.com/tint/1192): If a transform changes the order or removes an
// unused constant, the allocation may change on the next Resolver pass.
for (auto* decl : builder_->AST().GlobalDeclarations()) {
auto* override = decl->As<ast::Override>();
if (!override) {
continue;
}
auto* sem = sem_.Get(override);
OverrideId id;
if (ast::HasAttribute<ast::IdAttribute>(override->attributes)) {
id = sem->OverrideId();
} else {
// No ID was specified, so allocate the next available ID.
while (!ids_exhausted && override_ids_.Contains(next_id)) {
increment_next_id();
}
if (ids_exhausted) {
AddError(
"number of 'override' variables exceeded limit of " + std::to_string(kLimit),
decl->source);
return false;
}
id = next_id;
increment_next_id();
}
const_cast<sem::GlobalVariable*>(sem)->SetOverrideId(id);
}
return true;
}
void Resolver::SetShadows() {
for (auto it : dependencies_.shadows) {
CastableBase* b = sem_.Get(it.value);
if (TINT_UNLIKELY(!b)) {
TINT_ICE(Resolver, diagnostics_)
<< "AST node '" << it.value->TypeInfo().name << "' had no semantic info\n"
<< "At: " << it.value->source << "\n"
<< "Pointer: " << it.value;
}
Switch(
sem_.Get(it.key), //
[&](sem::LocalVariable* local) { local->SetShadows(b); },
[&](sem::Parameter* param) { param->SetShadows(b); });
}
}
sem::GlobalVariable* Resolver::GlobalVariable(const ast::Variable* v) {
utils::UniqueVector<const sem::GlobalVariable*, 4> transitively_referenced_overrides;
TINT_SCOPED_ASSIGNMENT(resolved_overrides_, &transitively_referenced_overrides);
auto* sem = As<sem::GlobalVariable>(Variable(v, /* is_global */ true));
if (!sem) {
return nullptr;
}
for (auto* attr : v->attributes) {
if (!Attribute(attr)) {
return nullptr;
}
}
if (!validator_.NoDuplicateAttributes(v->attributes)) {
return nullptr;
}
if (!validator_.GlobalVariable(sem, override_ids_)) {
return nullptr;
}
// Track the pipeline-overridable constants that are transitively referenced by this
// variable.
for (auto* var : transitively_referenced_overrides) {
builder_->Sem().AddTransitivelyReferencedOverride(sem, var);
}
if (auto* arr = sem->Type()->UnwrapRef()->As<type::Array>()) {
auto* refs = builder_->Sem().TransitivelyReferencedOverrides(arr);
if (refs) {
for (auto* var : *refs) {
builder_->Sem().AddTransitivelyReferencedOverride(sem, var);
}
}
}
return sem;
}
sem::Statement* Resolver::ConstAssert(const ast::ConstAssert* assertion) {
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "const assertion"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* expr = ValueExpression(assertion->condition);
if (!expr) {
return nullptr;
}
auto* cond = expr->ConstantValue();
if (auto* ty = cond->Type(); !ty->Is<type::Bool>()) {
AddError(
"const assertion condition must be a bool, got '" + builder_->FriendlyName(ty) + "'",
assertion->condition->source);
return nullptr;
}
if (!cond->ValueAs<bool>()) {
AddError("const assertion failed", assertion->source);
return nullptr;
}
auto* sem =
builder_->create<sem::Statement>(assertion, current_compound_statement_, current_function_);
builder_->Sem().Add(assertion, sem);
return sem;
}
sem::Function* Resolver::Function(const ast::Function* decl) {
Mark(decl->name);
auto* func = builder_->create<sem::Function>(decl);
builder_->Sem().Add(decl, func);
TINT_SCOPED_ASSIGNMENT(current_function_, func);
validator_.DiagnosticFilters().Push();
TINT_DEFER(validator_.DiagnosticFilters().Pop());
for (auto* attr : decl->attributes) {
if (!Attribute(attr)) {
return nullptr;
}
}
if (!validator_.NoDuplicateAttributes(decl->attributes)) {
return nullptr;
}
// Resolve all the parameters
uint32_t parameter_index = 0;
utils::Hashmap<Symbol, Source, 8> parameter_names;
for (auto* param : decl->params) {
Mark(param);
{ // Check the parameter name is unique for the function
if (auto added = parameter_names.Add(param->name->symbol, param->source); !added) {
auto name = builder_->Symbols().NameFor(param->name->symbol);
AddError("redefinition of parameter '" + name + "'", param->source);
AddNote("previous definition is here", *added.value);
return nullptr;
}
}
auto* p = Parameter(param, parameter_index++);
if (!p) {
return nullptr;
}
if (!validator_.Parameter(decl, p)) {
return nullptr;
}
func->AddParameter(p);
auto* p_ty = const_cast<type::Type*>(p->Type());
if (auto* str = p_ty->As<sem::Struct>()) {
switch (decl->PipelineStage()) {
case ast::PipelineStage::kVertex:
str->AddUsage(type::PipelineStageUsage::kVertexInput);
break;
case ast::PipelineStage::kFragment:
str->AddUsage(type::PipelineStageUsage::kFragmentInput);
break;
case ast::PipelineStage::kCompute:
str->AddUsage(type::PipelineStageUsage::kComputeInput);
break;
case ast::PipelineStage::kNone:
break;
}
}
}
// Resolve the return type
type::Type* return_type = nullptr;
if (auto ty = decl->return_type) {
return_type = Type(ty);
if (!return_type) {
return nullptr;
}
} else {
return_type = builder_->create<type::Void>();
}
func->SetReturnType(return_type);
// Determine if the return type has a location
for (auto* attr : decl->return_type_attributes) {
if (!Attribute(attr)) {
return nullptr;
}
if (auto* loc_attr = attr->As<ast::LocationAttribute>()) {
auto value = LocationAttribute(loc_attr);
if (!value) {
return nullptr;
}
func->SetReturnLocation(value.Get());
}
}
if (auto* str = return_type->As<sem::Struct>()) {
if (!ApplyAddressSpaceUsageToType(builtin::AddressSpace::kUndefined, str, decl->source)) {
AddNote("while instantiating return type for " +
builder_->Symbols().NameFor(decl->name->symbol),
decl->source);
return nullptr;
}
switch (decl->PipelineStage()) {
case ast::PipelineStage::kVertex:
str->AddUsage(type::PipelineStageUsage::kVertexOutput);
break;
case ast::PipelineStage::kFragment:
str->AddUsage(type::PipelineStageUsage::kFragmentOutput);
break;
case ast::PipelineStage::kCompute:
str->AddUsage(type::PipelineStageUsage::kComputeOutput);
break;
case ast::PipelineStage::kNone:
break;
}
}
ApplyDiagnosticSeverities(func);
if (!WorkgroupSize(decl)) {
return nullptr;
}
if (decl->IsEntryPoint()) {
entry_points_.Push(func);
}
if (decl->body) {
Mark(decl->body);
if (TINT_UNLIKELY(current_compound_statement_)) {
TINT_ICE(Resolver, diagnostics_)
<< "Resolver::Function() called with a current compound statement";
return nullptr;
}
auto* body = StatementScope(decl->body, builder_->create<sem::FunctionBlockStatement>(func),
[&] { return Statements(decl->body->statements); });
if (!body) {
return nullptr;
}
func->Behaviors() = body->Behaviors();
if (func->Behaviors().Contains(sem::Behavior::kReturn)) {
// https://www.w3.org/TR/WGSL/#behaviors-rules
// We assign a behavior to each function: it is its body’s behavior
// (treating the body as a regular statement), with any "Return" replaced
// by "Next".
func->Behaviors().Remove(sem::Behavior::kReturn);
func->Behaviors().Add(sem::Behavior::kNext);
}
}
if (!validator_.NoDuplicateAttributes(decl->return_type_attributes)) {
return nullptr;
}
auto stage = current_function_ ? current_function_->Declaration()->PipelineStage()
: ast::PipelineStage::kNone;
if (!validator_.Function(func, stage)) {
return nullptr;
}
// If this is an entry point, mark all transitively called functions as being
// used by this entry point.
if (decl->IsEntryPoint()) {
for (auto* f : func->TransitivelyCalledFunctions()) {
const_cast<sem::Function*>(f)->AddAncestorEntryPoint(func);
}
}
return func;
}
bool Resolver::WorkgroupSize(const ast::Function* func) {
// Set work-group size defaults.
sem::WorkgroupSize ws;
for (size_t i = 0; i < 3; i++) {
ws[i] = 1;
}
auto* attr = ast::GetAttribute<ast::WorkgroupAttribute>(func->attributes);
if (!attr) {
return true;
}
auto values = attr->Values();
utils::Vector<const sem::ValueExpression*, 3> args;
utils::Vector<const type::Type*, 3> arg_tys;
constexpr const char* kErrBadExpr =
"workgroup_size argument must be a constant or override-expression of type "
"abstract-integer, i32 or u32";
for (size_t i = 0; i < 3; i++) {
// Each argument to this attribute can either be a literal, an identifier for a
// module-scope constants, a const-expression, or nullptr if not specified.
auto* value = values[i];
if (!value) {
break;
}
const auto* expr = ValueExpression(value);
if (!expr) {
return false;
}
auto* ty = expr->Type();
if (!ty->IsAnyOf<type::I32, type::U32, type::AbstractInt>()) {
AddError(kErrBadExpr, value->source);
return false;
}
if (expr->Stage() != sem::EvaluationStage::kConstant &&
expr->Stage() != sem::EvaluationStage::kOverride) {
AddError(kErrBadExpr, value->source);
return false;
}
args.Push(expr);
arg_tys.Push(ty);
}
auto* common_ty = type::Type::Common(arg_tys);
if (!common_ty) {
AddError("workgroup_size arguments must be of the same type, either i32 or u32",
attr->source);
return false;
}
// If all arguments are abstract-integers, then materialize to i32.
if (common_ty->Is<type::AbstractInt>()) {
common_ty = builder_->create<type::I32>();
}
for (size_t i = 0; i < args.Length(); i++) {
auto* materialized = Materialize(args[i], common_ty);
if (!materialized) {
return false;
}
if (auto* value = materialized->ConstantValue()) {
if (value->ValueAs<AInt>() < 1) {
AddError("workgroup_size argument must be at least 1", values[i]->source);
return false;
}
ws[i] = value->ValueAs<u32>();
} else {
ws[i] = std::nullopt;
}
}
uint64_t total_size = static_cast<uint64_t>(ws[0].value_or(1));
for (size_t i = 1; i < 3; i++) {
total_size *= static_cast<uint64_t>(ws[i].value_or(1));
if (total_size > 0xffffffff) {
AddError("total workgroup grid size cannot exceed 0xffffffff", values[i]->source);
return false;
}
}
current_function_->SetWorkgroupSize(std::move(ws));
return true;
}
bool Resolver::Statements(utils::VectorRef<const ast::Statement*> stmts) {
sem::Behaviors behaviors{sem::Behavior::kNext};
bool reachable = true;
for (auto* stmt : stmts) {
Mark(stmt);
auto* sem = Statement(stmt);
if (!sem) {
return false;
}
// s1 s2:(B1∖{Next}) ∪ B2
sem->SetIsReachable(reachable);
if (reachable) {
behaviors = (behaviors - sem::Behavior::kNext) + sem->Behaviors();
}
reachable = reachable && sem->Behaviors().Contains(sem::Behavior::kNext);
}
current_statement_->Behaviors() = behaviors;
if (!validator_.Statements(stmts)) {
return false;
}
return true;
}
sem::Statement* Resolver::Statement(const ast::Statement* stmt) {
return Switch(
stmt,
// Compound statements. These create their own sem::CompoundStatement
// bindings.
[&](const ast::BlockStatement* b) { return BlockStatement(b); },
[&](const ast::ForLoopStatement* l) { return ForLoopStatement(l); },
[&](const ast::LoopStatement* l) { return LoopStatement(l); },
[&](const ast::WhileStatement* w) { return WhileStatement(w); },
[&](const ast::IfStatement* i) { return IfStatement(i); },
[&](const ast::SwitchStatement* s) { return SwitchStatement(s); },
// Non-Compound statements
[&](const ast::AssignmentStatement* a) { return AssignmentStatement(a); },
[&](const ast::BreakStatement* b) { return BreakStatement(b); },
[&](const ast::BreakIfStatement* b) { return BreakIfStatement(b); },
[&](const ast::CallStatement* c) { return CallStatement(c); },
[&](const ast::CompoundAssignmentStatement* c) { return CompoundAssignmentStatement(c); },
[&](const ast::ContinueStatement* c) { return ContinueStatement(c); },
[&](const ast::DiscardStatement* d) { return DiscardStatement(d); },
[&](const ast::IncrementDecrementStatement* i) { return IncrementDecrementStatement(i); },
[&](const ast::ReturnStatement* r) { return ReturnStatement(r); },
[&](const ast::VariableDeclStatement* v) { return VariableDeclStatement(v); },
[&](const ast::ConstAssert* sa) { return ConstAssert(sa); },
// Error cases
[&](const ast::CaseStatement*) {
AddError("case statement can only be used inside a switch statement", stmt->source);
return nullptr;
},
[&](Default) {
AddError("unknown statement type: " + std::string(stmt->TypeInfo().name), stmt->source);
return nullptr;
});
}
sem::CaseStatement* Resolver::CaseStatement(const ast::CaseStatement* stmt, const type::Type* ty) {
auto* sem =
builder_->create<sem::CaseStatement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
sem->Selectors().reserve(stmt->selectors.Length());
for (auto* sel : stmt->selectors) {
Mark(sel);
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "case selector"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
const constant::Value* const_value = nullptr;
if (!sel->IsDefault()) {
// The sem statement was created in the switch when attempting to determine the
// common type.
auto* materialized = Materialize(sem_.GetVal(sel->expr), ty);
if (!materialized) {
return false;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("case selector must be an i32 or u32 value", sel->source);
return false;
}
const_value = materialized->ConstantValue();
if (!const_value) {
AddError("case selector must be a constant expression", sel->source);
return false;
}
}
sem->Selectors().emplace_back(builder_->create<sem::CaseSelector>(sel, const_value));
}
Mark(stmt->body);
auto* body = BlockStatement(stmt->body);
if (!body) {
return false;
}
sem->SetBlock(body);
sem->Behaviors() = body->Behaviors();
return true;
});
}
sem::IfStatement* Resolver::IfStatement(const ast::IfStatement* stmt) {
auto* sem =
builder_->create<sem::IfStatement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto* cond = Load(ValueExpression(stmt->condition));
if (!cond) {
return false;
}
sem->SetCondition(cond);
sem->Behaviors() = cond->Behaviors();
sem->Behaviors().Remove(sem::Behavior::kNext);
Mark(stmt->body);
auto* body = builder_->create<sem::BlockStatement>(stmt->body, current_compound_statement_,
current_function_);
if (!StatementScope(stmt->body, body, [&] { return Statements(stmt->body->statements); })) {
return false;
}
sem->Behaviors().Add(body->Behaviors());
if (stmt->else_statement) {
Mark(stmt->else_statement);
auto* else_sem = Statement(stmt->else_statement);
if (!else_sem) {
return false;
}
sem->Behaviors().Add(else_sem->Behaviors());
} else {
// https://www.w3.org/TR/WGSL/#behaviors-rules
// if statements without an else branch are treated as if they had an
// empty else branch (which adds Next to their behavior)
sem->Behaviors().Add(sem::Behavior::kNext);
}
return validator_.IfStatement(sem);
});
}
sem::BlockStatement* Resolver::BlockStatement(const ast::BlockStatement* stmt) {
auto* sem = builder_->create<sem::BlockStatement>(
stmt->As<ast::BlockStatement>(), current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] { return Statements(stmt->statements); });
}
sem::LoopStatement* Resolver::LoopStatement(const ast::LoopStatement* stmt) {
auto* sem =
builder_->create<sem::LoopStatement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
Mark(stmt->body);
auto* body = builder_->create<sem::LoopBlockStatement>(
stmt->body, current_compound_statement_, current_function_);
return StatementScope(stmt->body, body, [&] {
if (!Statements(stmt->body->statements)) {
return false;
}
auto& behaviors = sem->Behaviors();
behaviors = body->Behaviors();
if (stmt->continuing) {
Mark(stmt->continuing);
auto* continuing = StatementScope(
stmt->continuing,
builder_->create<sem::LoopContinuingBlockStatement>(
stmt->continuing, current_compound_statement_, current_function_),
[&] { return Statements(stmt->continuing->statements); });
if (!continuing) {
return false;
}
behaviors.Add(continuing->Behaviors());
}
if (behaviors.Contains(sem::Behavior::kBreak)) { // Does the loop exit?
behaviors.Add(sem::Behavior::kNext);
} else {
behaviors.Remove(sem::Behavior::kNext);
}
behaviors.Remove(sem::Behavior::kBreak, sem::Behavior::kContinue);
return validator_.LoopStatement(sem);
});
});
}
sem::ForLoopStatement* Resolver::ForLoopStatement(const ast::ForLoopStatement* stmt) {
auto* sem = builder_->create<sem::ForLoopStatement>(stmt, current_compound_statement_,
current_function_);
return StatementScope(stmt, sem, [&] {
auto& behaviors = sem->Behaviors();
if (auto* initializer = stmt->initializer) {
Mark(initializer);
auto* init = Statement(initializer);
if (!init) {
return false;
}
behaviors.Add(init->Behaviors());
}
if (auto* cond_expr = stmt->condition) {
auto* cond = Load(ValueExpression(cond_expr));
if (!cond) {
return false;
}
sem->SetCondition(cond);
behaviors.Add(cond->Behaviors());
}
if (auto* continuing = stmt->continuing) {
Mark(continuing);
auto* cont = Statement(continuing);
if (!cont) {
return false;
}
behaviors.Add(cont->Behaviors());
}
Mark(stmt->body);
auto* body = builder_->create<sem::LoopBlockStatement>(
stmt->body, current_compound_statement_, current_function_);
if (!StatementScope(stmt->body, body, [&] { return Statements(stmt->body->statements); })) {
return false;
}
behaviors.Add(body->Behaviors());
if (stmt->condition || behaviors.Contains(sem::Behavior::kBreak)) { // Does the loop exit?
behaviors.Add(sem::Behavior::kNext);
} else {
behaviors.Remove(sem::Behavior::kNext);
}
behaviors.Remove(sem::Behavior::kBreak, sem::Behavior::kContinue);
return validator_.ForLoopStatement(sem);
});
}
sem::WhileStatement* Resolver::WhileStatement(const ast::WhileStatement* stmt) {
auto* sem =
builder_->create<sem::WhileStatement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto& behaviors = sem->Behaviors();
auto* cond = Load(ValueExpression(stmt->condition));
if (!cond) {
return false;
}
sem->SetCondition(cond);
behaviors.Add(cond->Behaviors());
Mark(stmt->body);
auto* body = builder_->create<sem::LoopBlockStatement>(
stmt->body, current_compound_statement_, current_function_);
if (!StatementScope(stmt->body, body, [&] { return Statements(stmt->body->statements); })) {
return false;
}
behaviors.Add(body->Behaviors());
// Always consider the while as having a 'next' behaviour because it has
// a condition. We don't check if the condition will terminate but it isn't
// valid to have an infinite loop in a WGSL program, so a non-terminating
// condition is already an invalid program.
behaviors.Add(sem::Behavior::kNext);
behaviors.Remove(sem::Behavior::kBreak, sem::Behavior::kContinue);
return validator_.WhileStatement(sem);
});
}
sem::Expression* Resolver::Expression(const ast::Expression* root) {
utils::Vector<const ast::Expression*, 64> sorted;
constexpr size_t kMaxExpressionDepth = 512U;
bool failed = false;
if (!ast::TraverseExpressions<ast::TraverseOrder::RightToLeft>(
root, diagnostics_, [&](const ast::Expression* expr, size_t depth) {
if (depth > kMaxExpressionDepth) {
AddError(
"reached max expression depth of " + std::to_string(kMaxExpressionDepth),
expr->source);
failed = true;
return ast::TraverseAction::Stop;
}
if (!Mark(expr)) {
failed = true;
return ast::TraverseAction::Stop;
}
if (auto* binary = expr->As<ast::BinaryExpression>();
binary && binary->IsLogical()) {
// Store potential const-eval short-circuit pair
logical_binary_lhs_to_parent_.Add(binary->lhs, binary);
}
sorted.Push(expr);
return ast::TraverseAction::Descend;
})) {
return nullptr;
}
if (failed) {
return nullptr;
}
for (auto* expr : utils::Reverse(sorted)) {
auto* sem_expr = Switch(
expr, //
[&](const ast::IndexAccessorExpression* array) { return IndexAccessor(array); },
[&](const ast::BinaryExpression* bin_op) { return Binary(bin_op); },
[&](const ast::BitcastExpression* bitcast) { return Bitcast(bitcast); },
[&](const ast::CallExpression* call) { return Call(call); },
[&](const ast::IdentifierExpression* ident) { return Identifier(ident); },
[&](const ast::LiteralExpression* literal) { return Literal(literal); },
[&](const ast::MemberAccessorExpression* member) { return MemberAccessor(member); },
[&](const ast::UnaryOpExpression* unary) { return UnaryOp(unary); },
[&](const ast::PhonyExpression*) {
return builder_->create<sem::ValueExpression>(expr, builder_->create<type::Void>(),
sem::EvaluationStage::kRuntime,
current_statement_,
/* constant_value */ nullptr,
/* has_side_effects */ false);
},
[&](Default) {
TINT_ICE(Resolver, diagnostics_)
<< "unhandled expression type: " << expr->TypeInfo().name;
return nullptr;
});
if (!sem_expr) {
return nullptr;
}
auto* val = sem_expr->As<sem::ValueExpression>();
if (val) {
if (auto* constraint = expr_eval_stage_constraint_.constraint) {
if (!validator_.EvaluationStage(val, expr_eval_stage_constraint_.stage,
constraint)) {
return nullptr;
}
}
}
builder_->Sem().Add(expr, sem_expr);
if (expr == root) {
return sem_expr;
}
// If we just processed the lhs of a constexpr logical binary expression, mark the rhs for
// short-circuiting.
if (val && val->ConstantValue()) {
if (auto binary = logical_binary_lhs_to_parent_.Find(expr)) {
const bool lhs_is_true = val->ConstantValue()->ValueAs<bool>();
if (((*binary)->IsLogicalAnd() && !lhs_is_true) ||
((*binary)->IsLogicalOr() && lhs_is_true)) {
// Mark entire expression tree to not const-evaluate
auto r = ast::TraverseExpressions( //
(*binary)->rhs, diagnostics_, [&](const ast::Expression* e) {
skip_const_eval_.Add(e);
return ast::TraverseAction::Descend;
});
if (!r) {
return nullptr;
}
}
}
}
}
TINT_ICE(Resolver, diagnostics_) << "Expression() did not find root node";
return nullptr;
}
sem::ValueExpression* Resolver::ValueExpression(const ast::Expression* expr) {
return sem_.AsValueExpression(Expression(expr));
}
sem::TypeExpression* Resolver::TypeExpression(const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "type"};
return sem_.AsTypeExpression(Expression(expr));
}
sem::FunctionExpression* Resolver::FunctionExpression(const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "call target"};
return sem_.AsFunctionExpression(Expression(expr));
}
type::Type* Resolver::Type(const ast::Expression* ast) {
auto* type_expr = TypeExpression(ast);
if (!type_expr) {
return nullptr;
}
return const_cast<type::Type*>(type_expr->Type());
}
sem::BuiltinEnumExpression<builtin::AddressSpace>* Resolver::AddressSpaceExpression(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "address space", builtin::kAddressSpaceStrings};
return sem_.AsAddressSpace(Expression(expr));
}
sem::BuiltinEnumExpression<builtin::BuiltinValue>* Resolver::BuiltinValueExpression(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "builtin value", builtin::kBuiltinValueStrings};
return sem_.AsBuiltinValue(Expression(expr));
}
sem::BuiltinEnumExpression<builtin::TexelFormat>* Resolver::TexelFormatExpression(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "texel format", builtin::kTexelFormatStrings};
return sem_.AsTexelFormat(Expression(expr));
}
sem::BuiltinEnumExpression<builtin::Access>* Resolver::AccessExpression(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "access", builtin::kAccessStrings};
return sem_.AsAccess(Expression(expr));
}
sem::BuiltinEnumExpression<builtin::InterpolationSampling>* Resolver::InterpolationSampling(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "interpolation sampling",
builtin::kInterpolationSamplingStrings};
return sem_.AsInterpolationSampling(Expression(expr));
}
sem::BuiltinEnumExpression<builtin::InterpolationType>* Resolver::InterpolationType(
const ast::Expression* expr) {
identifier_resolve_hint_ = {expr, "interpolation type", builtin::kInterpolationTypeStrings};
return sem_.AsInterpolationType(Expression(expr));
}
void Resolver::RegisterStore(const sem::ValueExpression* expr) {
auto& info = alias_analysis_infos_[current_function_];
Switch(
expr->RootIdentifier(),
[&](const sem::GlobalVariable* global) {
info.module_scope_writes.insert({global, expr});
},
[&](const sem::Parameter* param) { info.parameter_writes.insert(param); });
}
bool Resolver::AliasAnalysis(const sem::Call* call) {
auto* target = call->Target()->As<sem::Function>();
if (!target) {
return true;
}
if (validator_.IsValidationDisabled(target->Declaration()->attributes,
ast::DisabledValidation::kIgnorePointerAliasing)) {
return true;
}
// Helper to generate an aliasing error diagnostic.
struct Alias {
const sem::ValueExpression* expr; // the "other expression"
enum { Argument, ModuleScope } type; // the type of the "other" expression
std::string access; // the access performed for the "other" expression
};
auto make_error = [&](const sem::ValueExpression* arg, Alias&& var) {
AddError("invalid aliased pointer argument", arg->Declaration()->source);
switch (var.type) {
case Alias::Argument:
AddNote("aliases with another argument passed here",
var.expr->Declaration()->source);
break;
case Alias::ModuleScope: {
auto* func = var.expr->Stmt()->Function();
auto func_name = builder_->Symbols().NameFor(func->Declaration()->name->symbol);
AddNote(
"aliases with module-scope variable " + var.access + " in '" + func_name + "'",
var.expr->Declaration()->source);
break;
}
}
return false;
};
auto& args = call->Arguments();
auto& target_info = alias_analysis_infos_[target];
auto& caller_info = alias_analysis_infos_[current_function_];
// Track the set of root identifiers that are read and written by arguments passed in this
// call.
std::unordered_map<const sem::Variable*, const sem::ValueExpression*> arg_reads;
std::unordered_map<const sem::Variable*, const sem::ValueExpression*> arg_writes;
for (size_t i = 0; i < args.Length(); i++) {
auto* arg = args[i];
if (!arg->Type()->Is<type::Pointer>()) {
continue;
}
auto* root = arg->RootIdentifier();
if (target_info.parameter_writes.count(target->Parameters()[i])) {
// Arguments that are written to can alias with any other argument or module-scope
// variable access.
if (arg_writes.count(root)) {
return make_error(arg, {arg_writes.at(root), Alias::Argument, "write"});
}
if (arg_reads.count(root)) {
return make_error(arg, {arg_reads.at(root), Alias::Argument, "read"});
}
if (target_info.module_scope_reads.count(root)) {
return make_error(
arg, {target_info.module_scope_reads.at(root), Alias::ModuleScope, "read"});
}
if (target_info.module_scope_writes.count(root)) {
return make_error(
arg, {target_info.module_scope_writes.at(root), Alias::ModuleScope, "write"});
}
arg_writes.insert({root, arg});
// Propagate the write access to the caller.
Switch(
root,
[&](const sem::GlobalVariable* global) {
caller_info.module_scope_writes.insert({global, arg});
},
[&](const sem::Parameter* param) { caller_info.parameter_writes.insert(param); });
} else if (target_info.parameter_reads.count(target->Parameters()[i])) {
// Arguments that are read from can alias with arguments or module-scope variables
// that are written to.
if (arg_writes.count(root)) {
return make_error(arg, {arg_writes.at(root), Alias::Argument, "write"});
}
if (target_info.module_scope_writes.count(root)) {
return make_error(
arg, {target_info.module_scope_writes.at(root), Alias::ModuleScope, "write"});
}
arg_reads.insert({root, arg});
// Propagate the read access to the caller.
Switch(
root,
[&](const sem::GlobalVariable* global) {
caller_info.module_scope_reads.insert({global, arg});
},
[&](const sem::Parameter* param) { caller_info.parameter_reads.insert(param); });
}
}
// Propagate module-scope variable uses to the caller.
for (auto read : target_info.module_scope_reads) {
caller_info.module_scope_reads.insert({read.first, read.second});
}
for (auto write : target_info.module_scope_writes) {
caller_info.module_scope_writes.insert({write.first, write.second});
}
return true;
}
const type::Type* Resolver::ConcreteType(const type::Type* ty,
const type::Type* target_ty,
const Source& source) {
auto i32 = [&] { return builder_->create<type::I32>(); };
auto f32 = [&] { return builder_->create<type::F32>(); };
auto i32v = [&](uint32_t width) { return builder_->create<type::Vector>(i32(), width); };
auto f32v = [&](uint32_t width) { return builder_->create<type::Vector>(f32(), width); };
auto f32m = [&](uint32_t columns, uint32_t rows) {
return builder_->create<type::Matrix>(f32v(rows), columns);
};
return Switch(
ty, //
[&](const type::AbstractInt*) { return target_ty ? target_ty : i32(); },
[&](const type::AbstractFloat*) { return target_ty ? target_ty : f32(); },
[&](const type::Vector* v) {
return Switch(
v->type(), //
[&](const type::AbstractInt*) { return target_ty ? target_ty : i32v(v->Width()); },
[&](const type::AbstractFloat*) {
return target_ty ? target_ty : f32v(v->Width());
});
},
[&](const type::Matrix* m) {
return Switch(m->type(), //
[&](const type::AbstractFloat*) {
return target_ty ? target_ty : f32m(m->columns(), m->rows());
});
},
[&](const type::Array* a) -> const type::Type* {
const type::Type* target_el_ty = nullptr;
if (auto* target_arr_ty = As<type::Array>(target_ty)) {
target_el_ty = target_arr_ty->ElemType();
}
if (auto* el_ty = ConcreteType(a->ElemType(), target_el_ty, source)) {
return Array(source, source, source, el_ty, a->Count(), /* explicit_stride */ 0);
}
return nullptr;
},
[&](const sem::Struct* s) -> const type::Type* {
if (auto tys = s->ConcreteTypes(); !tys.IsEmpty()) {
return target_ty ? target_ty : tys[0];
}
return nullptr;
});
}
const sem::ValueExpression* Resolver::Load(const sem::ValueExpression* expr) {
if (!expr) {
// Allow for Load(ValueExpression(blah)), where failures pass through Load()
return nullptr;
}
if (!expr->Type()->Is<type::Reference>()) {
// Expression is not a reference type, so cannot be loaded. Just return expr.
return expr;
}
auto* load = builder_->create<sem::Load>(expr, current_statement_);
load->Behaviors() = expr->Behaviors();
builder_->Sem().Replace(expr->Declaration(), load);
// Track the load for the alias analysis.
auto& alias_info = alias_analysis_infos_[current_function_];
Switch(
expr->RootIdentifier(),
[&](const sem::GlobalVariable* global) {
alias_info.module_scope_reads.insert({global, expr});
},
[&](const sem::Parameter* param) { alias_info.parameter_reads.insert(param); });
return load;
}
const sem::ValueExpression* Resolver::Materialize(const sem::ValueExpression* expr,
const type::Type* target_type /* = nullptr */) {
if (!expr) {
// Allow for Materialize(ValueExpression(blah)), where failures pass through Materialize()
return nullptr;
}
auto* decl = expr->Declaration();
auto* concrete_ty = ConcreteType(expr->Type(), target_type, decl->source);
if (!concrete_ty) {
return expr; // Does not require materialization
}
auto* src_ty = expr->Type();
if (!validator_.Materialize(concrete_ty, src_ty, decl->source)) {
return nullptr;
}
const constant::Value* materialized_val = nullptr;
if (!skip_const_eval_.Contains(decl)) {
auto expr_val = expr->ConstantValue();
if (TINT_UNLIKELY(!expr_val)) {
TINT_ICE(Resolver, diagnostics_)
<< decl->source << "Materialize(" << decl->TypeInfo().name
<< ") called on expression with no constant value";
return nullptr;
}
auto val = const_eval_.Convert(concrete_ty, expr_val, decl->source);
if (!val) {
// Convert() has already failed and raised an diagnostic error.
return nullptr;
}
materialized_val = val.Get();
if (TINT_UNLIKELY(!materialized_val)) {
TINT_ICE(Resolver, diagnostics_)
<< decl->source << "ConvertValue(" << builder_->FriendlyName(expr_val->Type())
<< " -> " << builder_->FriendlyName(concrete_ty) << ") returned invalid value";
return nullptr;
}
}
auto* m =
builder_->create<sem::Materialize>(expr, current_statement_, concrete_ty, materialized_val);
m->Behaviors() = expr->Behaviors();
builder_->Sem().Replace(decl, m);
return m;
}
template <size_t N>
bool Resolver::MaybeMaterializeAndLoadArguments(utils::Vector<const sem::ValueExpression*, N>& args,
const sem::CallTarget* target) {
for (size_t i = 0, n = std::min(args.Length(), target->Parameters().Length()); i < n; i++) {
const auto* param_ty = target->Parameters()[i]->Type();
if (ShouldMaterializeArgument(param_ty)) {
auto* materialized = Materialize(args[i], param_ty);
if (!materialized) {
return false;
}
args[i] = materialized;
}
if (!param_ty->Is<type::Reference>()) {
auto* load = Load(args[i]);
if (!load) {
return false;
}
args[i] = load;
}
}
return true;
}
bool Resolver::ShouldMaterializeArgument(const type::Type* parameter_ty) const {
const auto* param_el_ty = type::Type::DeepestElementOf(parameter_ty);
return param_el_ty && !param_el_ty->Is<type::AbstractNumeric>();
}
bool Resolver::Convert(const constant::Value*& c,
const type::Type* target_ty,
const Source& source) {
auto r = const_eval_.Convert(target_ty, c, source);
if (!r) {
return false;
}
c = r.Get();
return true;
}
template <size_t N>
utils::Result<utils::Vector<const constant::Value*, N>> Resolver::ConvertArguments(
const utils::Vector<const sem::ValueExpression*, N>& args,
const sem::CallTarget* target) {
auto const_args = utils::Transform(args, [](auto* arg) { return arg->ConstantValue(); });
for (size_t i = 0, n = std::min(args.Length(), target->Parameters().Length()); i < n; i++) {
if (!Convert(const_args[i], target->Parameters()[i]->Type(),
args[i]->Declaration()->source)) {
return utils::Failure;
}
}
return const_args;
}
sem::ValueExpression* Resolver::IndexAccessor(const ast::IndexAccessorExpression* expr) {
auto* idx = Load(Materialize(sem_.GetVal(expr->index)));
if (!idx) {
return nullptr;
}
const auto* obj = sem_.GetVal(expr->object);
if (idx->Stage() != sem::EvaluationStage::kConstant) {
// If the index is non-constant, then the resulting expression is non-constant, so we'll
// have to materialize the object. For example, consider:
// vec2(1, 2)[runtime-index]
obj = Materialize(obj);
}
if (!obj) {
return nullptr;
}
auto* obj_raw_ty = obj->Type();
auto* obj_ty = obj_raw_ty->UnwrapRef();
auto* ty = Switch(
obj_ty, //
[&](const type::Array* arr) { return arr->ElemType(); },
[&](const type::Vector* vec) { return vec->type(); },
[&](const type::Matrix* mat) {
return builder_->create<type::Vector>(mat->type(), mat->rows());
},
[&](Default) {
AddError("cannot index type '" + sem_.TypeNameOf(obj_ty) + "'", expr->source);
return nullptr;
});
if (ty == nullptr) {
return nullptr;
}
auto* idx_ty = idx->Type()->UnwrapRef();
if (!idx_ty->IsAnyOf<type::I32, type::U32>()) {
AddError("index must be of type 'i32' or 'u32', found: '" + sem_.TypeNameOf(idx_ty) + "'",
idx->Declaration()->source);
return nullptr;
}
// If we're extracting from a reference, we return a reference.
if (auto* ref = obj_raw_ty->As<type::Reference>()) {
ty = builder_->create<type::Reference>(ty, ref->AddressSpace(), ref->Access());
}
const constant::Value* val = nullptr;
auto stage = sem::EarliestStage(obj->Stage(), idx->Stage());
if (stage == sem::EvaluationStage::kConstant && skip_const_eval_.Contains(expr)) {
stage = sem::EvaluationStage::kNotEvaluated;
} else {
if (auto r = const_eval_.Index(ty, obj, idx)) {
val = r.Get();
} else {
return nullptr;
}
}
bool has_side_effects = idx->HasSideEffects() || obj->HasSideEffects();
auto* sem = builder_->create<sem::IndexAccessorExpression>(
expr, ty, stage, obj, idx, current_statement_, std::move(val), has_side_effects,
obj->RootIdentifier());
sem->Behaviors() = idx->Behaviors() + obj->Behaviors();
return sem;
}
sem::ValueExpression* Resolver::Bitcast(const ast::BitcastExpression* expr) {
auto* inner = Load(Materialize(sem_.GetVal(expr->expr)));
if (!inner) {
return nullptr;
}
auto* ty = Type(expr->type);
if (!ty) {
return nullptr;
}
if (!validator_.Bitcast(expr, ty)) {
return nullptr;
}
auto stage = inner->Stage();
if (stage == sem::EvaluationStage::kConstant && skip_const_eval_.Contains(expr)) {
stage = sem::EvaluationStage::kNotEvaluated;
}
const constant::Value* value = nullptr;
if (stage == sem::EvaluationStage::kConstant) {
if (auto r = const_eval_.Bitcast(ty, inner->ConstantValue(), expr->source)) {
value = r.Get();
} else {
return nullptr;
}
}
auto* sem = builder_->create<sem::ValueExpression>(expr, ty, stage, current_statement_,
std::move(value), inner->HasSideEffects());
sem->Behaviors() = inner->Behaviors();
return sem;
}
sem::Call* Resolver::Call(const ast::CallExpression* expr) {
// A CallExpression can resolve to one of:
// * A function call.
// * A builtin call.
// * A value constructor.
// * A value conversion.
auto* target = expr->target;
Mark(target);
auto* ident = target->identifier;
Mark(ident);
// Resolve all of the arguments, their types and the set of behaviors.
utils::Vector<const sem::ValueExpression*, 8> args;
args.Reserve(expr->args.Length());
auto args_stage = sem::EvaluationStage::kConstant;
sem::Behaviors arg_behaviors;
for (size_t i = 0; i < expr->args.Length(); i++) {
auto* arg = sem_.GetVal(expr->args[i]);
if (!arg) {
return nullptr;
}
args.Push(arg);
args_stage = sem::EarliestStage(args_stage, arg->Stage());
arg_behaviors.Add(arg->Behaviors());
}
arg_behaviors.Remove(sem::Behavior::kNext);
// Did any arguments have side effects?
bool has_side_effects =
std::any_of(args.begin(), args.end(), [](auto* e) { return e->HasSideEffects(); });
// ctor_or_conv is a helper for building either a sem::ValueConstructor or
// sem::ValueConversion call for a CtorConvIntrinsic with an optional template argument type.
auto ctor_or_conv = [&](CtorConvIntrinsic ty, const type::Type* template_arg) -> sem::Call* {
auto arg_tys = utils::Transform(args, [](auto* arg) { return arg->Type(); });
auto entry = intrinsic_table_->Lookup(ty, template_arg, arg_tys, args_stage, expr->source);
if (!entry.target) {
return nullptr;
}
if (!MaybeMaterializeAndLoadArguments(args, entry.target)) {
return nullptr;
}
const constant::Value* value = nullptr;
auto stage = sem::EarliestStage(entry.target->Stage(), args_stage);
if (stage == sem::EvaluationStage::kConstant && skip_const_eval_.Contains(expr)) {
stage = sem::EvaluationStage::kNotEvaluated;
}
if (stage == sem::EvaluationStage::kConstant) {
auto const_args = ConvertArguments(args, entry.target);
if (!const_args) {
return nullptr;
}
if (auto r = (const_eval_.*entry.const_eval_fn)(entry.target->ReturnType(),
const_args.Get(), expr->source)) {
value = r.Get();
} else {
return nullptr;
}
}
return builder_->create<sem::Call>(expr, entry.target, stage, std::move(args),
current_statement_, value, has_side_effects);
};
// arr_or_str_init is a helper for building a sem::ValueConstructor for an array or structure
// constructor call target.
auto arr_or_str_init = [&](const type::Type* ty,
const sem::CallTarget* call_target) -> sem::Call* {
if (!MaybeMaterializeAndLoadArguments(args, call_target)) {
return nullptr;
}
auto stage = args_stage; // The evaluation stage of the call
const constant::Value* value = nullptr; // The constant value for the call
if (stage == sem::EvaluationStage::kConstant && skip_const_eval_.Contains(expr)) {
stage = sem::EvaluationStage::kNotEvaluated;
}
if (stage == sem::EvaluationStage::kConstant) {
auto els = utils::Transform(args, [&](auto* arg) { return arg->ConstantValue(); });
if (auto r = const_eval_.ArrayOrStructCtor(ty, std::move(els))) {
value = r.Get();
} else {
return nullptr;
}
if (!value) {
// Constant evaluation failed.
// Can happen for expressions that will fail validation (later).
// Use the kRuntime EvaluationStage, as kConstant will trigger an assertion in
// the sem::ValueExpression constructor, which checks that kConstant is paired
// with a constant value.
stage = sem::EvaluationStage::kRuntime;
}
}
return builder_->create<sem::Call>(expr, call_target, stage, std::move(args),
current_statement_, value, has_side_effects);
};
auto ty_init_or_conv = [&](const type::Type* type) {
return Switch(
type, //
[&](const type::I32*) { return ctor_or_conv(CtorConvIntrinsic::kI32, nullptr); },
[&](const type::U32*) { return ctor_or_conv(CtorConvIntrinsic::kU32, nullptr); },
[&](const type::F16*) {
return validator_.CheckF16Enabled(expr->source)
? ctor_or_conv(CtorConvIntrinsic::kF16, nullptr)
: nullptr;
},
[&](const type::F32*) { return ctor_or_conv(CtorConvIntrinsic::kF32, nullptr); },
[&](const type::Bool*) { return ctor_or_conv(CtorConvIntrinsic::kBool, nullptr); },
[&](const type::Vector* v) {
if (v->Packed()) {
TINT_ASSERT(Resolver, v->Width() == 3u);
return ctor_or_conv(CtorConvIntrinsic::kPackedVec3, v->type());
}
return ctor_or_conv(VectorCtorConvIntrinsic(v->Width()), v->type());
},
[&](const type::Matrix* m) {
return ctor_or_conv(MatrixCtorConvIntrinsic(m->columns(), m->rows()), m->type());
},
[&](const type::Array* arr) -> sem::Call* {
auto* call_target = array_ctors_.GetOrCreate(
ArrayConstructorSig{{arr, args.Length(), args_stage}},
[&]() -> sem::ValueConstructor* {
auto params = utils::Transform(args, [&](auto, size_t i) {
return builder_->create<sem::Parameter>(
nullptr, // declaration
static_cast<uint32_t>(i), // index
arr->ElemType(), // type
builtin::AddressSpace::kUndefined, // address_space
builtin::Access::kUndefined);
});
return builder_->create<sem::ValueConstructor>(arr, std::move(params),
args_stage);
});
auto* call = arr_or_str_init(arr, call_target);
if (!call) {
return nullptr;
}
// Validation must occur after argument materialization in arr_or_str_init().
if (!validator_.ArrayConstructor(expr, arr)) {
return nullptr;
}
return call;
},
[&](const sem::Struct* str) -> sem::Call* {
auto* call_target = struct_ctors_.GetOrCreate(
StructConstructorSig{{str, args.Length(), args_stage}},
[&]() -> sem::ValueConstructor* {
utils::Vector<sem::Parameter*, 8> params;
params.Resize(std::min(args.Length(), str->Members().Length()));
for (size_t i = 0, n = params.Length(); i < n; i++) {
params[i] = builder_->create<sem::Parameter>(
nullptr, // declaration
static_cast<uint32_t>(i), // index
str->Members()[i]->Type(), // type
builtin::AddressSpace::kUndefined, // address_space
builtin::Access::kUndefined); // access
}
return builder_->create<sem::ValueConstructor>(str, std::move(params),
args_stage);
});
auto* call = arr_or_str_init(str, call_target);
if (!call) {
return nullptr;
}
// Validation must occur after argument materialization in arr_or_str_init().
if (!validator_.StructureInitializer(expr, str)) {
return nullptr;
}
return call;
},
[&](Default) {
AddError("type is not constructible", expr->source);
return nullptr;
});
};
auto inferred_array = [&]() -> tint::sem::Call* {
auto el_count =
builder_->create<type::ConstantArrayCount>(static_cast<uint32_t>(args.Length()));
auto arg_tys = utils::Transform(args, [](auto* arg) { return arg->Type()->UnwrapRef(); });
auto el_ty = type::Type::Common(arg_tys);
if (!el_ty) {
AddError("cannot infer common array element type from constructor arguments",
expr->source);
utils::Hashset<const type::Type*, 8> types;
for (size_t i = 0; i < args.Length(); i++) {
if (types.Add(args[i]->Type())) {
AddNote("argument " + std::to_string(i) + " is of type '" +
sem_.TypeNameOf(args[i]->Type()) + "'",
args[i]->Declaration()->source);
}
}
return nullptr;
}
auto* arr = Array(expr->source, expr->source, expr->source, el_ty, el_count,
/* explicit_stride */ 0);
if (!arr) {
return nullptr;
}
return ty_init_or_conv(arr);
};
auto call = [&]() -> sem::Call* {
auto resolved = dependencies_.resolved_identifiers.Get(ident);
if (!resolved) {
TINT_ICE(Resolver, diagnostics_)
<< "identifier '" << builder_->Symbols().NameFor(ident->symbol)
<< "' was not resolved";
return nullptr;
}
if (auto* ast_node = resolved->Node()) {
return Switch(
sem_.Get(ast_node), //
[&](type::Type* t) { return ty_init_or_conv(t); },
[&](sem::Function* f) -> sem::Call* {
if (!TINT_LIKELY(CheckNotTemplated("function", ident))) {
return nullptr;
}
return FunctionCall(expr, f, args, arg_behaviors);
},
[&](sem::Expression* e) {
sem_.ErrorUnexpectedExprKind(e, "call target");
return nullptr;
},
[&](Default) {
ErrorMismatchedResolvedIdentifier(ident->source, *resolved, "call target");
return nullptr;
});
}
if (auto f = resolved->BuiltinFunction(); f != builtin::Function::kNone) {
if (!TINT_LIKELY(CheckNotTemplated("builtin", ident))) {
return nullptr;
}
return BuiltinCall(expr, f, args);
}
if (auto b = resolved->BuiltinType(); b != builtin::Builtin::kUndefined) {
if (!ident->Is<ast::TemplatedIdentifier>()) {
// No template arguments provided.
// Check to see if this is an inferred-element-type call.
switch (b) {
case builtin::Builtin::kArray:
return inferred_array();
case builtin::Builtin::kVec2:
return ctor_or_conv(CtorConvIntrinsic::kVec2, nullptr);
case builtin::Builtin::kVec3:
return ctor_or_conv(CtorConvIntrinsic::kVec3, nullptr);
case builtin::Builtin::kVec4:
return ctor_or_conv(CtorConvIntrinsic::kVec4, nullptr);
case builtin::Builtin::kMat2X2:
return ctor_or_conv(CtorConvIntrinsic::kMat2x2, nullptr);
case builtin::Builtin::kMat2X3:
return ctor_or_conv(CtorConvIntrinsic::kMat2x3, nullptr);
case builtin::Builtin::kMat2X4:
return ctor_or_conv(CtorConvIntrinsic::kMat2x4, nullptr);
case builtin::Builtin::kMat3X2:
return ctor_or_conv(CtorConvIntrinsic::kMat3x2, nullptr);
case builtin::Builtin::kMat3X3:
return ctor_or_conv(CtorConvIntrinsic::kMat3x3, nullptr);
case builtin::Builtin::kMat3X4:
return ctor_or_conv(CtorConvIntrinsic::kMat3x4, nullptr);
case builtin::Builtin::kMat4X2:
return ctor_or_conv(CtorConvIntrinsic::kMat4x2, nullptr);
case builtin::Builtin::kMat4X3:
return ctor_or_conv(CtorConvIntrinsic::kMat4x3, nullptr);
case builtin::Builtin::kMat4X4:
return ctor_or_conv(CtorConvIntrinsic::kMat4x4, nullptr);
default:
break;
}
}
auto* ty = BuiltinType(b, ident);
if (TINT_UNLIKELY(!ty)) {
return nullptr;
}
return ty_init_or_conv(ty);
}
if (auto* unresolved = resolved->Unresolved()) {
AddError("unresolved call target '" + unresolved->name + "'", expr->source);
return nullptr;
}
ErrorMismatchedResolvedIdentifier(ident->source, *resolved, "call target");
return nullptr;
}();
if (!call) {
return nullptr;
}
if (call->Target()->IsAnyOf<sem::ValueConstructor, sem::ValueConversion>()) {
// The target of the call was a type.
// Associate the target identifier expression with the resolved type.
auto* ty_expr =
builder_->create<sem::TypeExpression>(target, current_statement_, call->Type());
builder_->Sem().Add(target, ty_expr);
}
return validator_.Call(call, current_statement_) ? call : nullptr;
}
template <size_t N>
sem::Call* Resolver::BuiltinCall(const ast::CallExpression* expr,
builtin::Function builtin_type,
utils::Vector<const sem::ValueExpression*, N>& args) {
auto arg_stage = sem::EvaluationStage::kConstant;
for (auto* arg : args) {
arg_stage = sem::EarliestStage(arg_stage, arg->Stage());
}
IntrinsicTable::Builtin builtin;
{
auto arg_tys = utils::Transform(args, [](auto* arg) { return arg->Type(); });
builtin = intrinsic_table_->Lookup(builtin_type, arg_tys, arg_stage, expr->source);
if (!builtin.sem) {
return nullptr;
}
}
if (builtin_type == builtin::Function::kTintMaterialize) {
args[0] = Materialize(args[0]);
if (!args[0]) {
return nullptr;
}
} else {
// Materialize arguments if the parameter type is not abstract
if (!MaybeMaterializeAndLoadArguments(args, builtin.sem)) {
return nullptr;
}
}
if (builtin.sem->IsDeprecated()) {
AddWarning("use of deprecated builtin", expr->source);
}
// If the builtin is @const, and all arguments have constant values, evaluate the builtin
// now.
const constant::Value* value = nullptr;
auto stage = sem::EarliestStage(arg_stage, builtin.sem->Stage());
if (stage == sem::EvaluationStage::kConstant && skip_const_eval_.Contains(expr)) {
stage = sem::EvaluationStage::kNotEvaluated;
}
if (stage == sem::EvaluationStage::kConstant) {
auto const_args = ConvertArguments(args, builtin.sem);
if (!const_args) {
return nullptr;
}
if (auto r = (const_eval_.*builtin.const_eval_fn)(builtin.sem->ReturnType(),
const_args.Get(), expr->source)) {
value = r.Get();
} else {
return nullptr;
}
}
bool has_side_effects =
builtin.sem->HasSideEffects() ||
std::any_of(args.begin(), args.end(), [](auto* e) { return e->HasSideEffects(); });
auto* call = builder_->create<sem::Call>(expr, builtin.sem, stage, std::move(args),
current_statement_, value, has_side_effects);
if (current_function_) {
current_function_->AddDirectlyCalledBuiltin(builtin.sem);
current_function_->AddDirectCall(call);
}
if (!validator_.RequiredExtensionForBuiltinFunction(call)) {
return nullptr;
}
if (sem::IsTextureBuiltin(builtin_type)) {
if (!validator_.TextureBuiltinFunction(call)) {
return nullptr;
}
CollectTextureSamplerPairs(builtin.sem, call->Arguments());
}
if (builtin_type == builtin::Function::kWorkgroupUniformLoad) {
if (!validator_.WorkgroupUniformLoad(call)) {
return nullptr;
}
}
if (!validator_.BuiltinCall(call)) {
return nullptr;
}
return call;
}
type::Type* Resolver::BuiltinType(builtin::Builtin builtin_ty, const ast::Identifier* ident) {
auto& b = *builder_;
auto check_no_tmpl_args = [&](type::Type* ty) -> type::Type* {
return TINT_LIKELY(CheckNotTemplated("type", ident)) ? ty : nullptr;
};
auto f32 = [&] { return b.create<type::F32>(); };
auto i32 = [&] { return b.create<type::I32>(); };
auto u32 = [&] { return b.create<type::U32>(); };
auto f16 = [&] {
return validator_.CheckF16Enabled(ident->source) ? b.create<type::F16>() : nullptr;
};
auto templated_identifier =
[&](size_t min_args, size_t max_args = /* use min */ 0) -> const ast::TemplatedIdentifier* {
if (max_args == 0) {
max_args = min_args;
}
auto* tmpl_ident = ident->As<ast::TemplatedIdentifier>();
if (!tmpl_ident) {
if (TINT_UNLIKELY(min_args != 0)) {
AddError("expected '<' for '" + b.Symbols().NameFor(ident->symbol) + "'",
Source{ident->source.range.end});
}
return nullptr;
}
if (min_args == max_args) {
if (TINT_UNLIKELY(tmpl_ident->arguments.Length() != min_args)) {
AddError("'" + b.Symbols().NameFor(ident->symbol) + "' requires " +
std::to_string(min_args) + " template arguments",
ident->source);
return nullptr;
}
} else {
if (TINT_UNLIKELY(tmpl_ident->arguments.Length() < min_args)) {
AddError("'" + b.Symbols().NameFor(ident->symbol) + "' requires at least " +
std::to_string(min_args) + " template arguments",
ident->source);
return nullptr;
}
if (TINT_UNLIKELY(tmpl_ident->arguments.Length() > max_args)) {
AddError("'" + b.Symbols().NameFor(ident->symbol) + "' requires at most " +
std::to_string(max_args) + " template arguments",
ident->source);
return nullptr;
}
}
return tmpl_ident;
};
auto vec = [&](type::Type* el, uint32_t n) -> type::Vector* {
if (TINT_UNLIKELY(!el)) {
return nullptr;
}
if (TINT_UNLIKELY(!validator_.Vector(el, ident->source))) {
return nullptr;
}
return b.create<type::Vector>(el, n);
};
auto mat = [&](type::Type* el, uint32_t num_columns, uint32_t num_rows) -> type::Matrix* {
if (TINT_UNLIKELY(!el)) {
return nullptr;
}
if (TINT_UNLIKELY(!validator_.Matrix(el, ident->source))) {
return nullptr;
}
auto* column = vec(el, num_rows);
if (!column) {
return nullptr;
}
return b.create<type::Matrix>(column, num_columns);
};
auto vec_t = [&](uint32_t n) -> type::Vector* {
auto* tmpl_ident = templated_identifier(1);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ty = Type(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!ty)) {
return nullptr;
}
return vec(const_cast<type::Type*>(ty), n);
};
auto mat_t = [&](uint32_t num_columns, uint32_t num_rows) -> type::Matrix* {
auto* tmpl_ident = templated_identifier(1);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ty = Type(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!ty)) {
return nullptr;
}
return mat(const_cast<type::Type*>(ty), num_columns, num_rows);
};
auto array = [&]() -> type::Array* {
utils::UniqueVector<const sem::GlobalVariable*, 4> transitively_referenced_overrides;
TINT_SCOPED_ASSIGNMENT(resolved_overrides_, &transitively_referenced_overrides);
auto* tmpl_ident = templated_identifier(1, 2);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ast_el_ty = tmpl_ident->arguments[0];
auto* ast_count = (tmpl_ident->arguments.Length() > 1) ? tmpl_ident->arguments[1] : nullptr;
auto* el_ty = Type(ast_el_ty);
if (!el_ty) {
return nullptr;
}
const type::ArrayCount* el_count =
ast_count ? ArrayCount(ast_count) : builder_->create<type::RuntimeArrayCount>();
if (!el_count) {
return nullptr;
}
// Look for explicit stride via @stride(n) attribute
uint32_t explicit_stride = 0;
if (!ArrayAttributes(tmpl_ident->attributes, el_ty, explicit_stride)) {
return nullptr;
}
auto* out = Array(tmpl_ident->source, //
ast_el_ty->source, //
ast_count ? ast_count->source : ident->source, //
el_ty, el_count, explicit_stride);
if (!out) {
return nullptr;
}
if (el_ty->Is<type::Atomic>()) {
atomic_composite_info_.Add(out, &ast_el_ty->source);
} else {
if (auto found = atomic_composite_info_.Get(el_ty)) {
atomic_composite_info_.Add(out, *found);
}
}
// Track the pipeline-overridable constants that are transitively referenced by this
// array type.
for (auto* var : transitively_referenced_overrides) {
builder_->Sem().AddTransitivelyReferencedOverride(out, var);
}
return out;
};
auto atomic = [&]() -> type::Atomic* {
auto* tmpl_ident = templated_identifier(1); // atomic<type>
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ty_expr = TypeExpression(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!ty_expr)) {
return nullptr;
}
auto* ty = ty_expr->Type();
auto* out = builder_->create<type::Atomic>(ty);
if (!validator_.Atomic(tmpl_ident, out)) {
return nullptr;
}
return out;
};
auto ptr = [&]() -> type::Pointer* {
auto* tmpl_ident = templated_identifier(2, 3); // ptr<address, type [, access]>
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* address_space_expr = AddressSpaceExpression(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!address_space_expr)) {
return nullptr;
}
auto address_space = address_space_expr->Value();
auto* store_ty_expr = TypeExpression(tmpl_ident->arguments[1]);
if (TINT_UNLIKELY(!store_ty_expr)) {
return nullptr;
}
auto* store_ty = const_cast<type::Type*>(store_ty_expr->Type());
auto access = DefaultAccessForAddressSpace(address_space);
if (tmpl_ident->arguments.Length() > 2) {
auto* access_expr = AccessExpression(tmpl_ident->arguments[2]);
if (TINT_UNLIKELY(!access_expr)) {
return nullptr;
}
access = access_expr->Value();
}
auto* out = b.create<type::Pointer>(store_ty, address_space, access);
if (!validator_.Pointer(tmpl_ident, out)) {
return nullptr;
}
if (!ApplyAddressSpaceUsageToType(address_space, store_ty,
store_ty_expr->Declaration()->source)) {
AddNote("while instantiating " + builder_->FriendlyName(out), ident->source);
return nullptr;
}
return out;
};
auto sampled_texture = [&](type::TextureDimension dim) -> type::SampledTexture* {
auto* tmpl_ident = templated_identifier(1);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ty_expr = TypeExpression(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!ty_expr)) {
return nullptr;
}
auto* out = b.create<type::SampledTexture>(dim, ty_expr->Type());
return validator_.SampledTexture(out, ident->source) ? out : nullptr;
};
auto multisampled_texture = [&](type::TextureDimension dim) -> type::MultisampledTexture* {
auto* tmpl_ident = templated_identifier(1);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* ty_expr = TypeExpression(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!ty_expr)) {
return nullptr;
}
auto* out = b.create<type::MultisampledTexture>(dim, ty_expr->Type());
return validator_.MultisampledTexture(out, ident->source) ? out : nullptr;
};
auto storage_texture = [&](type::TextureDimension dim) -> type::StorageTexture* {
auto* tmpl_ident = templated_identifier(2);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* format = TexelFormatExpression(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!format)) {
return nullptr;
}
auto* access = AccessExpression(tmpl_ident->arguments[1]);
if (TINT_UNLIKELY(!access)) {
return nullptr;
}
auto* subtype = type::StorageTexture::SubtypeFor(format->Value(), builder_->Types());
auto* tex = b.create<type::StorageTexture>(dim, format->Value(), access->Value(), subtype);
if (!validator_.StorageTexture(tex, ident->source)) {
return nullptr;
}
return tex;
};
auto packed_vec3_t = [&]() -> type::Vector* {
auto* tmpl_ident = templated_identifier(1);
if (TINT_UNLIKELY(!tmpl_ident)) {
return nullptr;
}
auto* el_ty = Type(tmpl_ident->arguments[0]);
if (TINT_UNLIKELY(!el_ty)) {
return nullptr;
}
if (TINT_UNLIKELY(!el_ty)) {
return nullptr;
}
if (TINT_UNLIKELY(!validator_.Vector(el_ty, ident->source))) {
return nullptr;
}
return b.create<type::Vector>(el_ty, 3u, true);
};
switch (builtin_ty) {
case builtin::Builtin::kBool:
return check_no_tmpl_args(b.create<type::Bool>());
case builtin::Builtin::kI32:
return check_no_tmpl_args(i32());
case builtin::Builtin::kU32:
return check_no_tmpl_args(u32());
case builtin::Builtin::kF16:
return check_no_tmpl_args(f16());
case builtin::Builtin::kF32:
return check_no_tmpl_args(b.create<type::F32>());
case builtin::Builtin::kVec2:
return vec_t(2);
case builtin::Builtin::kVec3:
return vec_t(3);
case builtin::Builtin::kVec4:
return vec_t(4);
case builtin::Builtin::kMat2X2:
return mat_t(2, 2);
case builtin::Builtin::kMat2X3:
return mat_t(2, 3);
case builtin::Builtin::kMat2X4:
return mat_t(2, 4);
case builtin::Builtin::kMat3X2:
return mat_t(3, 2);
case builtin::Builtin::kMat3X3:
return mat_t(3, 3);
case builtin::Builtin::kMat3X4:
return mat_t(3, 4);
case builtin::Builtin::kMat4X2:
return mat_t(4, 2);
case builtin::Builtin::kMat4X3:
return mat_t(4, 3);
case builtin::Builtin::kMat4X4:
return mat_t(4, 4);
case builtin::Builtin::kMat2X2F:
return check_no_tmpl_args(mat(f32(), 2u, 2u));
case builtin::Builtin::kMat2X3F:
return check_no_tmpl_args(mat(f32(), 2u, 3u));
case builtin::Builtin::kMat2X4F:
return check_no_tmpl_args(mat(f32(), 2u, 4u));
case builtin::Builtin::kMat3X2F:
return check_no_tmpl_args(mat(f32(), 3u, 2u));
case builtin::Builtin::kMat3X3F:
return check_no_tmpl_args(mat(f32(), 3u, 3u));
case builtin::Builtin::kMat3X4F:
return check_no_tmpl_args(mat(f32(), 3u, 4u));
case builtin::Builtin::kMat4X2F:
return check_no_tmpl_args(mat(f32(), 4u, 2u));
case builtin::Builtin::kMat4X3F:
return check_no_tmpl_args(mat(f32(), 4u, 3u));
case builtin::Builtin::kMat4X4F:
return check_no_tmpl_args(mat(f32(), 4u, 4u));
case builtin::Builtin::kMat2X2H:
return check_no_tmpl_args(mat(f16(), 2u, 2u));
case builtin::Builtin::kMat2X3H:
return check_no_tmpl_args(mat(f16(), 2u, 3u));
case builtin::Builtin::kMat2X4H:
return check_no_tmpl_args(mat(f16(), 2u, 4u));
case builtin::Builtin::kMat3X2H:
return check_no_tmpl_args(mat(f16(), 3u, 2u));
case builtin::Builtin::kMat3X3H:
return check_no_tmpl_args(mat(f16(), 3u, 3u));
case builtin::Builtin::kMat3X4H:
return check_no_tmpl_args(mat(f16(), 3u, 4u));
case builtin::Builtin::kMat4X2H:
return check_no_tmpl_args(mat(f16(), 4u, 2u));
case builtin::Builtin::kMat4X3H:
return check_no_tmpl_args(mat(f16(), 4u, 3u));
case builtin::Builtin::kMat4X4H:
return check_no_tmpl_args(mat(f16(), 4u, 4u));
case builtin::Builtin::kVec2F:
return check_no_tmpl_args(vec(f32(), 2u));
case builtin::Builtin::kVec3F:
return check_no_tmpl_args(vec(f32(), 3u));
case builtin::Builtin::kVec4F:
return check_no_tmpl_args(vec(f32(), 4u));
case builtin::Builtin::kVec2H:
return check_no_tmpl_args(vec(f16(), 2u));
case builtin::Builtin::kVec3H:
return check_no_tmpl_args(vec(f16(), 3u));
case builtin::Builtin::kVec4H:
return check_no_tmpl_args(vec(f16(), 4u));
case builtin::Builtin::kVec2I:
return check_no_tmpl_args(vec(i32(), 2u));
case builtin::Builtin::kVec3I:
return check_no_tmpl_args(vec(i32(), 3u));
case builtin::Builtin::kVec4I:
return check_no_tmpl_args(vec(i32(), 4u));
case builtin::Builtin::kVec2U:
return check_no_tmpl_args(vec(u32(), 2u));
case builtin::Builtin::kVec3U:
return check_no_tmpl_args(vec(u32(), 3u));
case builtin::Builtin::kVec4U:
return check_no_tmpl_args(vec(u32(), 4u));
case builtin::Builtin::kArray:
return array();
case builtin::Builtin::kAtomic:
return atomic();
case builtin::Builtin::kPtr:
return ptr();
case builtin::Builtin::kSampler:
return check_no_tmpl_args(builder_->create<type::Sampler>(type::SamplerKind::kSampler));
case builtin::Builtin::kSamplerComparison:
return check_no_tmpl_args(
builder_->create<type::Sampler>(type::SamplerKind::kComparisonSampler));
case builtin::Builtin::kTexture1D:
return sampled_texture(type::TextureDimension::k1d);
case builtin::Builtin::kTexture2D:
return sampled_texture(type::TextureDimension::k2d);
case builtin::Builtin::kTexture2DArray:
return sampled_texture(type::TextureDimension::k2dArray);
case builtin::Builtin::kTexture3D:
return sampled_texture(type::TextureDimension::k3d);
case builtin::Builtin::kTextureCube:
return sampled_texture(type::TextureDimension::kCube);
case builtin::Builtin::kTextureCubeArray:
return sampled_texture(type::TextureDimension::kCubeArray);
case builtin::Builtin::kTextureDepth2D:
return check_no_tmpl_args(
builder_->create<type::DepthTexture>(type::TextureDimension::k2d));
case builtin::Builtin::kTextureDepth2DArray:
return check_no_tmpl_args(
builder_->create<type::DepthTexture>(type::TextureDimension::k2dArray));
case builtin::Builtin::kTextureDepthCube:
return check_no_tmpl_args(
builder_->create<type::DepthTexture>(type::TextureDimension::kCube));
case builtin::Builtin::kTextureDepthCubeArray:
return check_no_tmpl_args(
builder_->create<type::DepthTexture>(type::TextureDimension::kCubeArray));
case builtin::Builtin::kTextureDepthMultisampled2D:
return check_no_tmpl_args(
builder_->create<type::DepthMultisampledTexture>(type::TextureDimension::k2d));
case builtin::Builtin::kTextureExternal:
return check_no_tmpl_args(builder_->create<type::ExternalTexture>());
case builtin::Builtin::kTextureMultisampled2D:
return multisampled_texture(type::TextureDimension::k2d);
case builtin::Builtin::kTextureStorage1D:
return storage_texture(type::TextureDimension::k1d);
case builtin::Builtin::kTextureStorage2D:
return storage_texture(type::TextureDimension::k2d);
case builtin::Builtin::kTextureStorage2DArray:
return storage_texture(type::TextureDimension::k2dArray);
case builtin::Builtin::kTextureStorage3D:
return storage_texture(type::TextureDimension::k3d);
case builtin::Builtin::kPackedVec3: {
return packed_vec3_t();
}
case builtin::Builtin::kUndefined:
break;
}
auto name = builder_->Symbols().NameFor(ident->symbol);
TINT_ICE(Resolver, diagnostics_) << ident->source << " unhandled builtin type '" << name << "'";
return nullptr;
}
size_t Resolver::NestDepth(const type::Type* ty) const {
return Switch(
ty, //
[](const type::Vector*) { return size_t{1}; },
[](const type::Matrix*) { return size_t{2}; },
[&](Default) {
if (auto d = nest_depth_.Get(ty)) {
return *d;
}
return size_t{0};
});
}
void Resolver::CollectTextureSamplerPairs(
const sem::Builtin* builtin,
utils::VectorRef<const sem::ValueExpression*> args) const {
// Collect a texture/sampler pair for this builtin.
const auto& signature = builtin->Signature();
int texture_index = signature.IndexOf(sem::ParameterUsage::kTexture);
if (TINT_UNLIKELY(texture_index == -1)) {
TINT_ICE(Resolver, diagnostics_) << "texture builtin without texture parameter";
}
if (auto* user =
args[static_cast<size_t>(texture_index)]->UnwrapLoad()->As<sem::VariableUser>()) {
auto* texture = user->Variable();
if (!texture->Type()->UnwrapRef()->Is<type::StorageTexture>()) {
int sampler_index = signature.IndexOf(sem::ParameterUsage::kSampler);
const sem::Variable* sampler = sampler_index != -1
? args[static_cast<size_t>(sampler_index)]
->UnwrapLoad()
->As<sem::VariableUser>()
->Variable()
: nullptr;
current_function_->AddTextureSamplerPair(texture, sampler);
}
}
}
template <size_t N>
sem::Call* Resolver::FunctionCall(const ast::CallExpression* expr,
sem::Function* target,
utils::Vector<const sem::ValueExpression*, N>& args,
sem::Behaviors arg_behaviors) {
if (!MaybeMaterializeAndLoadArguments(args, target)) {
return nullptr;
}
// TODO(crbug.com/tint/1420): For now, assume all function calls have side
// effects.
bool has_side_effects = true;
auto* call = builder_->create<sem::Call>(expr, target, sem::EvaluationStage::kRuntime,
std::move(args), current_statement_,
/* constant_value */ nullptr, has_side_effects);
target->AddCallSite(call);
call->Behaviors() = arg_behaviors + target->Behaviors();
if (!validator_.FunctionCall(call, current_statement_)) {
return nullptr;
}
if (current_function_) {
// Note: Requires called functions to be resolved first.
// This is currently guaranteed as functions must be declared before
// use.
current_function_->AddTransitivelyCalledFunction(target);
current_function_->AddDirectCall(call);
for (auto* transitive_call : target->TransitivelyCalledFunctions()) {
current_function_->AddTransitivelyCalledFunction(transitive_call);
}
// We inherit any referenced variables from the callee.
for (auto* var : target->TransitivelyReferencedGlobals()) {
current_function_->AddTransitivelyReferencedGlobal(var);
}
if (!AliasAnalysis(call)) {
return nullptr;
}
// Note: Validation *must* be performed before calling this method.
CollectTextureSamplerPairs(target, call->Arguments());
}
// Associate the target identifier expression with the resolved function.
auto* fn_expr =
builder_->create<sem::FunctionExpression>(expr->target, current_statement_, target);
builder_->Sem().Add(expr->target, fn_expr);
return call;
}
void Resolver::CollectTextureSamplerPairs(
sem::Function* func,
utils::VectorRef<const sem::ValueExpression*> args) const {
// Map all texture/sampler pairs from the target function to the
// current function. These can only be global or parameter
// variables. Resolve any parameter variables to the corresponding
// argument passed to the current function. Leave global variables
// as-is. Then add the mapped pair to the current function's list of
// texture/sampler pairs.
for (sem::VariablePair pair : func->TextureSamplerPairs()) {
const sem::Variable* texture = pair.first;
const sem::Variable* sampler = pair.second;
if (auto* param = texture->As<sem::Parameter>()) {
texture = args[param->Index()]->UnwrapLoad()->As<sem::VariableUser>()->Variable();
}
if (sampler) {
if (auto* param = sampler->As<sem::Parameter>()) {
sampler = args[param->Index()]->UnwrapLoad()->As<sem::VariableUser>()->Variable();
}
}
current_function_->AddTextureSamplerPair(texture, sampler);
}
}
sem::ValueExpression* Resolver::Literal(const ast::LiteralExpression* literal) {
auto* ty = Switch(
literal,
[&](const ast::IntLiteralExpression* i) -> type::Type* {
switch (i->suffix) {
case ast::IntLiteralExpression::Suffix::kNone:
return builder_->create<type::AbstractInt>();
case ast::IntLiteralExpression::Suffix::kI:
return builder_->create<type::I32>();
case ast::IntLiteralExpression::Suffix::kU:
return builder_->create<type::U32>();
}
TINT_UNREACHABLE(Resolver, diagnostics_)
<< "Unhandled integer literal suffix: " << i->suffix;
return nullptr;
},
[&](const ast::FloatLiteralExpression* f) -> type::Type* {
switch (f->suffix) {
case ast::FloatLiteralExpression::Suffix::kNone:
return builder_->create<type::AbstractFloat>();
case ast::FloatLiteralExpression::Suffix::kF:
return builder_->create<type::F32>();
case ast::FloatLiteralExpression::Suffix::kH:
return validator_.CheckF16Enabled(literal->source)
? builder_->create<type::F16>()
: nullptr;
}
TINT_UNREACHABLE(Resolver, diagnostics_)
<< "Unhandled float literal suffix: " << f->suffix;
return nullptr;
},
[&](const ast::BoolLiteralExpression*) { return builder_->create<type::Bool>(); },
[&](Default) {
TINT_UNREACHABLE(Resolver, diagnostics_)
<< "Unhandled literal type: " << literal->TypeInfo().name;
return nullptr;
});
if (ty == nullptr) {
return nullptr;
}
const constant::Value* val = nullptr;
auto stage = sem::EvaluationStage::kConstant;
if (skip_const_eval_.Contains(literal)) {
stage = sem::EvaluationStage::kNotEvaluated;
}
if (stage == sem::EvaluationStage::kConstant) {
if (auto r = const_eval_.Literal(ty, literal)) {
val = r.Get();
} else {
return nullptr;
}
}
return builder_->create<sem::ValueExpression>(literal, ty, stage, current_statement_,
std::move(val),
/* has_side_effects */ false);
}
sem::Expression* Resolver::Identifier(const ast::IdentifierExpression* expr) {
auto* ident = expr->identifier;
Mark(ident);
auto resolved = dependencies_.resolved_identifiers.Get(ident);
if (!resolved) {
TINT_ICE(Resolver, diagnostics_)
<< "identifier '" << builder_->Symbols().NameFor(ident->symbol) << "' was not resolved";
return nullptr;
}
if (auto* ast_node = resolved->Node()) {
auto* resolved_node = sem_.Get(ast_node);
return Switch(
resolved_node, //
[&](sem::Variable* variable) -> sem::VariableUser* {
auto symbol = ident->symbol;
auto* user =
builder_->create<sem::VariableUser>(expr, current_statement_, variable);
if (current_statement_) {
// If identifier is part of a loop continuing block, make sure it
// doesn't refer to a variable that is bypassed by a continue statement
// in the loop's body block.
if (auto* continuing_block =
current_statement_
->FindFirstParent<sem::LoopContinuingBlockStatement>()) {
auto* loop_block =
continuing_block->FindFirstParent<sem::LoopBlockStatement>();
if (loop_block->FirstContinue()) {
// If our identifier is in loop_block->decls, make sure its index is
// less than first_continue
if (auto decl = loop_block->Decls().Find(symbol)) {
if (decl->order >= loop_block->NumDeclsAtFirstContinue()) {
AddError("continue statement bypasses declaration of '" +
builder_->Symbols().NameFor(symbol) + "'",
loop_block->FirstContinue()->source);
AddNote("identifier '" + builder_->Symbols().NameFor(symbol) +
"' declared here",
decl->variable->Declaration()->source);
AddNote("identifier '" + builder_->Symbols().NameFor(symbol) +
"' referenced in continuing block here",
expr->source);
return nullptr;
}
}
}
}
}
auto* global = variable->As<sem::GlobalVariable>();
if (current_function_) {
if (global) {
current_function_->AddDirectlyReferencedGlobal(global);
auto* refs = builder_->Sem().TransitivelyReferencedOverrides(global);
if (refs) {
for (auto* var : *refs) {
current_function_->AddTransitivelyReferencedGlobal(var);
}
}
}
} else if (variable->Declaration()->Is<ast::Override>()) {
if (resolved_overrides_) {
// Track the reference to this pipeline-overridable constant and any other
// pipeline-overridable constants that it references.
resolved_overrides_->Add(global);
auto* refs = builder_->Sem().TransitivelyReferencedOverrides(global);
if (refs) {
for (auto* var : *refs) {
resolved_overrides_->Add(var);
}
}
}
} else if (variable->Declaration()->Is<ast::Var>()) {
// Use of a module-scope 'var' outside of a function.
// Note: The spec is currently vague around the rules here. See
// https://github.com/gpuweb/gpuweb/issues/3081. Remove this comment when
// resolved.
std::string desc = "var '" + builder_->Symbols().NameFor(symbol) + "' ";
AddError(desc + "cannot be referenced at module-scope", expr->source);
AddNote(desc + "declared here", variable->Declaration()->source);
return nullptr;
}
variable->AddUser(user);
return user;
},
[&](const type::Type* ty) -> sem::TypeExpression* {
if (!TINT_LIKELY(CheckNotTemplated("type", ident))) {
return nullptr;
}
return builder_->create<sem::TypeExpression>(expr, current_statement_, ty);
},
[&](const sem::Function* fn) -> sem::FunctionExpression* {
if (!TINT_LIKELY(CheckNotTemplated("function", ident))) {
return nullptr;
}
return builder_->create<sem::FunctionExpression>(expr, current_statement_, fn);
});
}
if (auto builtin_ty = resolved->BuiltinType(); builtin_ty != builtin::Builtin::kUndefined) {
auto* ty = BuiltinType(builtin_ty, ident);
if (!ty) {
return nullptr;
}
return builder_->create<sem::TypeExpression>(expr, current_statement_, ty);
}
if (resolved->BuiltinFunction() != builtin::Function::kNone) {
AddError("missing '(' for builtin function call", expr->source.End());
return nullptr;
}
if (auto access = resolved->Access(); access != builtin::Access::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::Access>>(
expr, current_statement_, access);
}
if (auto addr = resolved->AddressSpace(); addr != builtin::AddressSpace::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::AddressSpace>>(
expr, current_statement_, addr);
}
if (auto builtin = resolved->BuiltinValue(); builtin != builtin::BuiltinValue::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::BuiltinValue>>(
expr, current_statement_, builtin);
}
if (auto i_smpl = resolved->InterpolationSampling();
i_smpl != builtin::InterpolationSampling::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::InterpolationSampling>>(
expr, current_statement_, i_smpl);
}
if (auto i_type = resolved->InterpolationType();
i_type != builtin::InterpolationType::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::InterpolationType>>(
expr, current_statement_, i_type);
}
if (auto fmt = resolved->TexelFormat(); fmt != builtin::TexelFormat::kUndefined) {
return builder_->create<sem::BuiltinEnumExpression<builtin::TexelFormat>>(
expr, current_statement_, fmt);
}
if (auto* unresolved = resolved->Unresolved()) {
if (identifier_resolve_hint_.expression == expr) {
AddError("unresolved " + std::string(identifier_resolve_hint_.usage) + " '" +
unresolved->name + "'",
expr->source);
if (!identifier_resolve_hint_.suggestions.IsEmpty()) {
// Filter out suggestions that have a leading underscore.
utils::Vector<const char*, 8> filtered;
for (auto* str : identifier_resolve_hint_.suggestions) {
if (str[0] != '_') {
filtered.Push(str);
}
}
utils::StringStream msg;
utils::SuggestAlternatives(unresolved->name,
filtered.Slice().Reinterpret<char const* const>(), msg);
AddNote(msg.str(), expr->source);
}
} else {
AddError("unresolved identifier '" + unresolved->name + "'", expr->source);
}
return nullptr;
}
TINT_UNREACHABLE(Resolver, diagnostics_)
<< "unhandled resolved identifier: " << resolved->String(builder_->Symbols(), diagnostics_);
return nullptr;
}
sem::ValueExpression* Resolver::MemberAccessor(const ast::MemberAccessorExpression* expr) {
auto* structure = sem_.TypeOf(expr->object);
auto* storage_ty = structure->UnwrapRef();
auto* object = sem_.GetVal(expr->object);
if (!object) {
return nullptr;
}
auto* root_ident = object->RootIdentifier();
const type::Type* ty = nullptr;
// Object may be a side-effecting expression (e.g. function call).
bool has_side_effects = object->HasSideEffects();
Mark(expr->member);
return Switch(
storage_ty, //
[&](const sem::Struct* str) -> sem::ValueExpression* {
auto symbol = expr->member->symbol;
const sem::StructMember* member = nullptr;
for (auto* m : str->Members()) {
if (m->Name() == symbol) {
member = m;
break;
}
}
if (member == nullptr) {
AddError("struct member " + builder_->Symbols().NameFor(symbol) + " not found",
expr->source);
return nullptr;
}
ty = member->Type();
// If we're extracting from a reference, we return a reference.
if (auto* ref = structure->As<type::Reference>()) {
ty = builder_->create<type::Reference>(ty, ref->AddressSpace(), ref->Access());
}
auto val = const_eval_.MemberAccess(object, member);
if (!val) {
return nullptr;
}
return builder_->create<sem::StructMemberAccess>(expr, ty, current_statement_,
val.Get(), object, member,
has_side_effects, root_ident);
},
[&](const type::Vector* vec) -> sem::ValueExpression* {
std::string s = builder_->Symbols().NameFor(expr->member->symbol);
auto size = s.size();
utils::Vector<uint32_t, 4> swizzle;
swizzle.Reserve(s.size());
for (auto c : s) {
switch (c) {
case 'x':
case 'r':
swizzle.Push(0u);
break;
case 'y':
case 'g':
swizzle.Push(1u);
break;
case 'z':
case 'b':
swizzle.Push(2u);
break;
case 'w':
case 'a':
swizzle.Push(3u);
break;
default:
AddError("invalid vector swizzle character",
expr->member->source.Begin() + swizzle.Length());
return nullptr;
}
if (swizzle.Back() >= vec->Width()) {
AddError("invalid vector swizzle member", expr->member->source);
return nullptr;
}
}
if (size < 1 || size > 4) {
AddError("invalid vector swizzle size", expr->member->source);
return nullptr;
}
// All characters are valid, check if they're being mixed
auto is_rgba = [](char c) { return c == 'r' || c == 'g' || c == 'b' || c == 'a'; };
auto is_xyzw = [](char c) { return c == 'x' || c == 'y' || c == 'z' || c == 'w'; };
if (!std::all_of(s.begin(), s.end(), is_rgba) &&
!std::all_of(s.begin(), s.end(), is_xyzw)) {
AddError("invalid mixing of vector swizzle characters rgba with xyzw",
expr->member->source);
return nullptr;
}
const sem::ValueExpression* obj_expr = object;
if (size == 1) {
// A single element swizzle is just the type of the vector.
ty = vec->type();
// If we're extracting from a reference, we return a reference.
if (auto* ref = structure->As<type::Reference>()) {
ty = builder_->create<type::Reference>(ty, ref->AddressSpace(), ref->Access());
}
} else {
// The vector will have a number of components equal to the length of
// the swizzle.
ty = builder_->create<type::Vector>(vec->type(), static_cast<uint32_t>(size));
// The load rule is invoked before the swizzle, if necessary.
obj_expr = Load(object);
}
auto val = const_eval_.Swizzle(ty, object, swizzle);
if (!val) {
return nullptr;
}
return builder_->create<sem::Swizzle>(expr, ty, current_statement_, val.Get(), obj_expr,
std::move(swizzle), has_side_effects, root_ident);
},
[&](Default) {
AddError("invalid member accessor expression. Expected vector or struct, got '" +
sem_.TypeNameOf(storage_ty) + "'",
expr->member->source);
return nullptr;
});
}
sem::ValueExpression* Resolver::Binary(const ast::BinaryExpression* expr) {
const auto* lhs = sem_.GetVal(expr->lhs);
const auto* rhs = sem_.GetVal(expr->rhs);
if (!lhs || !rhs) {
return nullptr;
}
auto* lhs_ty = lhs->Type()->UnwrapRef();
auto* rhs_ty = rhs->Type()->UnwrapRef();
auto stage = sem::EarliestStage(lhs->Stage(), rhs->Stage());
auto op = intrinsic_table_->Lookup(expr->op, lhs_ty, rhs_ty, stage, expr->source, false);
if (!op.result) {
return nullptr;
}
if (ShouldMaterializeArgument(op.lhs)) {
lhs = Materialize(lhs, op.lhs);
if (!lhs) {
return nullptr;
}
}
if (ShouldMaterializeArgument(op.rhs)) {
rhs = Materialize(rhs, op.rhs);
if (!rhs) {
return nullptr;
}
}
// Load arguments if they are references
lhs = Load(lhs);
if (!lhs) {
return nullptr;
}
rhs = Load(rhs);
if (!rhs) {
return nullptr;
}
const constant::Value* value = nullptr;
if (skip_const_eval_.Contains(expr)) {
// This expression is short-circuited by an ancestor expression.
// Do not const-eval.
stage = sem::EvaluationStage::kNotEvaluated;
} else if (lhs->Stage() == sem::EvaluationStage::kConstant &&
rhs->Stage() == sem::EvaluationStage::kNotEvaluated) {
// Short-circuiting binary expression. Use the LHS value and stage.
value = lhs->ConstantValue();
stage = sem::EvaluationStage::kConstant;
} else if (stage == sem::EvaluationStage::kConstant) {
// Both LHS and RHS have expressions that are constant evaluation stage.
if (op.const_eval_fn) { // Do we have a @const operator?
// Yes. Perform any required abstract argument values implicit conversions to the
// overload parameter types, and const-eval.
utils::Vector const_args{lhs->ConstantValue(), rhs->ConstantValue()};
// Implicit conversion (e.g. AInt -> AFloat)
if (!Convert(const_args[0], op.lhs, lhs->Declaration()->source)) {
return nullptr;
}
if (!Convert(const_args[1], op.rhs, rhs->Declaration()->source)) {
return nullptr;
}
if (auto r = (const_eval_.*op.const_eval_fn)(op.result, const_args, expr->source)) {
value = r.Get();
} else {
return nullptr;
}
} else {
// The arguments have constant values, but the operator cannot be const-evaluated.
// This can only be evaluated at runtime.
stage = sem::EvaluationStage::kRuntime;
}
}
bool has_side_effects = lhs->HasSideEffects() || rhs->HasSideEffects();
auto* sem = builder_->create<sem::ValueExpression>(expr, op.result, stage, current_statement_,
value, has_side_effects);
sem->Behaviors() = lhs->Behaviors() + rhs->Behaviors();
return sem;
}
sem::ValueExpression* Resolver::UnaryOp(const ast::UnaryOpExpression* unary) {
const auto* expr = sem_.GetVal(unary->expr);
if (!expr) {
return nullptr;
}
auto* expr_ty = expr->Type();
const type::Type* ty = nullptr;
const sem::Variable* root_ident = nullptr;
const constant::Value* value = nullptr;
auto stage = sem::EvaluationStage::kRuntime;
switch (unary->op) {
case ast::UnaryOp::kAddressOf:
if (auto* ref = expr_ty->As<type::Reference>()) {
if (ref->StoreType()->UnwrapRef()->is_handle()) {
AddError("cannot take the address of expression in handle address space",
unary->expr->source);
return nullptr;
}
auto* array = unary->expr->As<ast::IndexAccessorExpression>();
auto* member = unary->expr->As<ast::MemberAccessorExpression>();
if ((array && sem_.TypeOf(array->object)->UnwrapRef()->Is<type::Vector>()) ||
(member && sem_.TypeOf(member->object)->UnwrapRef()->Is<type::Vector>())) {
AddError("cannot take the address of a vector component", unary->expr->source);
return nullptr;
}
ty = builder_->create<type::Pointer>(ref->StoreType(), ref->AddressSpace(),
ref->Access());
root_ident = expr->RootIdentifier();
} else {
AddError("cannot take the address of expression", unary->expr->source);
return nullptr;
}
break;
case ast::UnaryOp::kIndirection:
if (auto* ptr = expr_ty->As<type::Pointer>()) {
ty = builder_->create<type::Reference>(ptr->StoreType(), ptr->AddressSpace(),
ptr->Access());
root_ident = expr->RootIdentifier();
} else {
AddError("cannot dereference expression of type '" + sem_.TypeNameOf(expr_ty) + "'",
unary->expr->source);
return nullptr;
}
break;
default: {
stage = expr->Stage();
auto op = intrinsic_table_->Lookup(unary->op, expr_ty, stage, unary->source);
if (!op.result) {
return nullptr;
}
ty = op.result;
if (ShouldMaterializeArgument(op.parameter)) {
expr = Materialize(expr, op.parameter);
if (!expr) {
return nullptr;
}
}
// Load expr if it is a reference
expr = Load(expr);
if (!expr) {
return nullptr;
}
stage = expr->Stage();
if (stage == sem::EvaluationStage::kConstant) {
if (op.const_eval_fn) {
if (auto r = (const_eval_.*op.const_eval_fn)(
ty, utils::Vector{expr->ConstantValue()},
expr->Declaration()->source)) {
value = r.Get();
} else {
return nullptr;
}
} else {
stage = sem::EvaluationStage::kRuntime;
}
}
break;
}
}
auto* sem = builder_->create<sem::ValueExpression>(unary, ty, stage, current_statement_, value,
expr->HasSideEffects(), root_ident);
sem->Behaviors() = expr->Behaviors();
return sem;
}
bool Resolver::Attribute(const ast::Attribute* attr) {
Mark(attr);
return Switch(
attr, //
[&](const ast::BuiltinAttribute* b) { return BuiltinAttribute(b); },
[&](const ast::DiagnosticAttribute* d) { return DiagnosticControl(d->control); },
[&](const ast::InterpolateAttribute* i) { return InterpolateAttribute(i); },
[&](const ast::InternalAttribute* i) { return InternalAttribute(i); },
[&](Default) { return true; });
}
bool Resolver::BuiltinAttribute(const ast::BuiltinAttribute* attr) {
auto* builtin_expr = BuiltinValueExpression(attr->builtin);
if (!builtin_expr) {
return false;
}
// Apply the resolved tint::sem::BuiltinEnumExpression<tint::builtin::BuiltinValue> to the
// attribute.
builder_->Sem().Add(attr, builtin_expr);
return true;
}
bool Resolver::InterpolateAttribute(const ast::InterpolateAttribute* attr) {
if (!InterpolationType(attr->type)) {
return false;
}
if (attr->sampling && !InterpolationSampling(attr->sampling)) {
return false;
}
return true;
}
bool Resolver::InternalAttribute(const ast::InternalAttribute* attr) {
for (auto* dep : attr->dependencies) {
if (!Expression(dep)) {
return false;
}
}
return true;
}
bool Resolver::DiagnosticControl(const ast::DiagnosticControl& control) {
Mark(control.rule_name);
auto rule_name = builder_->Symbols().NameFor(control.rule_name->symbol);
auto rule = builtin::ParseDiagnosticRule(rule_name);
if (rule != builtin::DiagnosticRule::kUndefined) {
validator_.DiagnosticFilters().Set(rule, control.severity);
} else {
utils::StringStream ss;
ss << "unrecognized diagnostic rule '" << rule_name << "'\n";
utils::SuggestAlternatives(rule_name, builtin::kDiagnosticRuleStrings, ss);
AddWarning(ss.str(), control.rule_name->source);
}
return true;
}
bool Resolver::Enable(const ast::Enable* enable) {
for (auto* ext : enable->extensions) {
Mark(ext);
enabled_extensions_.Add(ext->name);
}
return true;
}
type::Type* Resolver::TypeDecl(const ast::TypeDecl* named_type) {
Mark(named_type->name);
type::Type* result = nullptr;
if (auto* alias = named_type->As<ast::Alias>()) {
result = Alias(alias);
} else if (auto* str = named_type->As<ast::Struct>()) {
result = Structure(str);
} else {
TINT_UNREACHABLE(Resolver, diagnostics_) << "Unhandled TypeDecl";
}
if (!result) {
return nullptr;
}
builder_->Sem().Add(named_type, result);
return result;
}
const type::ArrayCount* Resolver::ArrayCount(const ast::Expression* count_expr) {
// Evaluate the constant array count expression.
const auto* count_sem = Materialize(ValueExpression(count_expr));
if (!count_sem) {
return nullptr;
}
if (count_sem->Stage() == sem::EvaluationStage::kOverride) {
// array count is an override expression.
// Is the count a named 'override'?
if (auto* user = count_sem->UnwrapMaterialize()->As<sem::VariableUser>()) {
if (auto* global = user->Variable()->As<sem::GlobalVariable>()) {
return builder_->create<sem::NamedOverrideArrayCount>(global);
}
}
return builder_->create<sem::UnnamedOverrideArrayCount>(count_sem);
}
auto* count_val = count_sem->ConstantValue();
if (!count_val) {
AddError("array count must evaluate to a constant integer expression or override variable",
count_expr->source);
return nullptr;
}
if (auto* ty = count_val->Type(); !ty->is_integer_scalar()) {
AddError("array count must evaluate to a constant integer expression, but is type '" +
builder_->FriendlyName(ty) + "'",
count_expr->source);
return nullptr;
}
int64_t count = count_val->ValueAs<AInt>();
if (count < 1) {
AddError("array count (" + std::to_string(count) + ") must be greater than 0",
count_expr->source);
return nullptr;
}
return builder_->create<type::ConstantArrayCount>(static_cast<uint32_t>(count));
}
bool Resolver::ArrayAttributes(utils::VectorRef<const ast::Attribute*> attributes,
const type::Type* el_ty,
uint32_t& explicit_stride) {
if (!validator_.NoDuplicateAttributes(attributes)) {
return false;
}
for (auto* attr : attributes) {
Mark(attr);
if (auto* sd = attr->As<ast::StrideAttribute>()) {
// If the element type is not plain, then el_ty->Align() may be 0, in which case we
// could get a DBZ in ArrayStrideAttribute(). In this case, validation will error
// about the invalid array element type (which is tested later), so this is just a
// seatbelt.
if (IsPlain(el_ty)) {
explicit_stride = sd->stride;
if (!validator_.ArrayStrideAttribute(sd, el_ty->Size(), el_ty->Align())) {
return false;
}
}
continue;
}
AddError("attribute is not valid for array types", attr->source);
return false;
}
return true;
}
type::Array* Resolver::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) {
uint32_t el_align = el_ty->Align();
uint32_t el_size = el_ty->Size();
uint64_t implicit_stride = el_size ? utils::RoundUp<uint64_t>(el_align, el_size) : 0;
uint64_t stride = explicit_stride ? explicit_stride : implicit_stride;
uint64_t size = 0;
if (auto const_count = el_count->As<type::ConstantArrayCount>()) {
size = const_count->value * stride;
if (size > std::numeric_limits<uint32_t>::max()) {
utils::StringStream msg;
msg << "array byte size (0x" << std::hex << size
<< ") must not exceed 0xffffffff bytes";
AddError(msg.str(), count_source);
return nullptr;
}
} else if (el_count->Is<type::RuntimeArrayCount>()) {
size = stride;
}
auto* out = builder_->create<type::Array>(
el_ty, el_count, el_align, static_cast<uint32_t>(size), static_cast<uint32_t>(stride),
static_cast<uint32_t>(implicit_stride));
// Maximum nesting depth of composite types
// https://gpuweb.github.io/gpuweb/wgsl/#limits
const size_t nest_depth = 1 + NestDepth(el_ty);
if (nest_depth > kMaxNestDepthOfCompositeType) {
AddError("array has nesting depth of " + std::to_string(nest_depth) + ", maximum is " +
std::to_string(kMaxNestDepthOfCompositeType),
array_source);
return nullptr;
}
nest_depth_.Add(out, nest_depth);
if (!validator_.Array(out, el_source)) {
return nullptr;
}
return out;
}
type::Type* Resolver::Alias(const ast::Alias* alias) {
auto* ty = Type(alias->type);
if (!ty) {
return nullptr;
}
if (!validator_.Alias(alias)) {
return nullptr;
}
return ty;
}
sem::Struct* Resolver::Structure(const ast::Struct* str) {
auto struct_name = [&] { //
return builder_->Symbols().NameFor(str->name->symbol);
};
if (validator_.IsValidationEnabled(str->attributes,
ast::DisabledValidation::kIgnoreStructMemberLimit)) {
// Maximum number of members in a structure type
// https://gpuweb.github.io/gpuweb/wgsl/#limits
const size_t kMaxNumStructMembers = 16383;
if (str->members.Length() > kMaxNumStructMembers) {
AddError("struct '" + struct_name() + "' has " + std::to_string(str->members.Length()) +
" members, maximum is " + std::to_string(kMaxNumStructMembers),
str->source);
return nullptr;
}
}
if (!validator_.NoDuplicateAttributes(str->attributes)) {
return nullptr;
}
for (auto* attr : str->attributes) {
Mark(attr);
}
utils::Vector<const sem::StructMember*, 8> sem_members;
sem_members.Reserve(str->members.Length());
// Calculate the effective size and alignment of each field, and the overall size of the
// structure. For size, use the size attribute if provided, otherwise use the default size
// for the type. For alignment, use the alignment attribute if provided, otherwise use the
// default alignment for the member type. Diagnostic errors are raised if a basic rule is
// violated. Validation of storage-class rules requires analyzing the actual variable usage
// of the structure, and so is performed as part of the variable validation.
uint64_t struct_size = 0;
uint64_t struct_align = 1;
utils::Hashmap<Symbol, const ast::StructMember*, 8> member_map;
size_t members_nest_depth = 0;
for (auto* member : str->members) {
Mark(member);
Mark(member->name);
if (auto added = member_map.Add(member->name->symbol, member); !added) {
AddError("redefinition of '" + builder_->Symbols().NameFor(member->name->symbol) + "'",
member->source);
AddNote("previous definition is here", (*added.value)->source);
return nullptr;
}
// Resolve member type
auto type = Type(member->type);
if (!type) {
return nullptr;
}
members_nest_depth = std::max(members_nest_depth, NestDepth(type));
// validator_.Validate member type
if (!validator_.IsPlain(type)) {
AddError(sem_.TypeNameOf(type) + " cannot be used as the type of a structure member",
member->source);
return nullptr;
}
uint64_t offset = struct_size;
uint64_t align = type->Align();
uint64_t size = type->Size();
if (!validator_.NoDuplicateAttributes(member->attributes)) {
return nullptr;
}
bool has_offset_attr = false;
bool has_align_attr = false;
bool has_size_attr = false;
std::optional<uint32_t> location;
for (auto* attr : member->attributes) {
if (!Attribute(attr)) {
return nullptr;
}
bool ok = Switch(
attr, //
[&](const ast::StructMemberOffsetAttribute* o) {
// Offset attributes are not part of the WGSL spec, but are emitted
// by the SPIR-V reader.
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant,
"@offset value"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* materialized = Materialize(ValueExpression(o->expr));
if (!materialized) {
return false;
}
auto const_value = materialized->ConstantValue();
if (!const_value) {
AddError("@offset must be constant expression", o->expr->source);
return false;
}
offset = const_value->ValueAs<uint64_t>();
if (offset < struct_size) {
AddError("offsets must be in ascending order", o->source);
return false;
}
has_offset_attr = true;
return true;
},
[&](const ast::StructMemberAlignAttribute* a) {
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@align"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* materialized = Materialize(ValueExpression(a->expr));
if (!materialized) {
return false;
}
if (!materialized->Type()->IsAnyOf<type::I32, type::U32>()) {
AddError("@align must be an i32 or u32 value", a->source);
return false;
}
auto const_value = materialized->ConstantValue();
if (!const_value) {
AddError("@align must be constant expression", a->source);
return false;
}
auto value = const_value->ValueAs<AInt>();
if (value <= 0 || !utils::IsPowerOfTwo(value)) {
AddError("@align value must be a positive, power-of-two integer",
a->source);
return false;
}
align = u32(value);
has_align_attr = true;
return true;
},
[&](const ast::StructMemberSizeAttribute* s) {
ExprEvalStageConstraint constraint{sem::EvaluationStage::kConstant, "@size"};
TINT_SCOPED_ASSIGNMENT(expr_eval_stage_constraint_, constraint);
auto* materialized = Materialize(ValueExpression(s->expr));
if (!materialized) {
return false;
}
if (!materialized->Type()->IsAnyOf<type::U32, type::I32>()) {
AddError("@size must be an i32 or u32 value", s->source);
return false;
}
auto const_value = materialized->ConstantValue();
if (!const_value) {
AddError("@size must be constant expression", s->expr->source);
return false;
}
{
auto value = const_value->ValueAs<AInt>();
if (value <= 0) {
AddError("@size must be a positive integer", s->source);
return false;
}
}
auto value = const_value->ValueAs<uint64_t>();
if (value < size) {
AddError("@size must be at least as big as the type's size (" +
std::to_string(size) + ")",
s->source);
return false;
}
size = u32(value);
has_size_attr = true;
return true;
},
[&](const ast::LocationAttribute* loc_attr) {
auto value = LocationAttribute(loc_attr);
if (!value) {
return false;
}
location = value.Get();
return true;
},
[&](Default) {
// The validator will check attributes can be applied to the struct member.
return true;
});
if (!ok) {
return nullptr;
}
}
if (has_offset_attr && (has_align_attr || has_size_attr)) {
AddError("@offset cannot be used with @align or @size", member->source);
return nullptr;
}
offset = utils::RoundUp(align, offset);
if (offset > std::numeric_limits<uint32_t>::max()) {
utils::StringStream msg;
msg << "struct member offset (0x" << std::hex << offset << ") must not exceed 0x"
<< std::hex << std::numeric_limits<uint32_t>::max() << " bytes";
AddError(msg.str(), member->source);
return nullptr;
}
auto* sem_member = builder_->create<sem::StructMember>(
member, member->source, member->name->symbol, type,
static_cast<uint32_t>(sem_members.Length()), static_cast<uint32_t>(offset),
static_cast<uint32_t>(align), static_cast<uint32_t>(size), location);
builder_->Sem().Add(member, sem_member);
sem_members.Push(sem_member);
struct_size = offset + size;
struct_align = std::max(struct_align, align);
}
uint64_t size_no_padding = struct_size;
struct_size = utils::RoundUp(struct_align, struct_size);
if (struct_size > std::numeric_limits<uint32_t>::max()) {
utils::StringStream msg;
msg << "struct size (0x" << std::hex << struct_size << ") must not exceed 0xffffffff bytes";
AddError(msg.str(), str->source);
return nullptr;
}
if (TINT_UNLIKELY(struct_align > std::numeric_limits<uint32_t>::max())) {
TINT_ICE(Resolver, diagnostics_) << "calculated struct stride exceeds uint32";
return nullptr;
}
auto* out = builder_->create<sem::Struct>(
str, str->source, str->name->symbol, std::move(sem_members),
static_cast<uint32_t>(struct_align), static_cast<uint32_t>(struct_size),
static_cast<uint32_t>(size_no_padding));
for (size_t i = 0; i < sem_members.Length(); i++) {
auto* mem_type = sem_members[i]->Type();
if (mem_type->Is<type::Atomic>()) {
atomic_composite_info_.Add(out, &sem_members[i]->Source());
break;
} else {
if (auto found = atomic_composite_info_.Get(mem_type)) {
atomic_composite_info_.Add(out, *found);
break;
}
}
const_cast<sem::StructMember*>(sem_members[i])->SetStruct(out);
}
auto stage = current_function_ ? current_function_->Declaration()->PipelineStage()
: ast::PipelineStage::kNone;
if (!validator_.Structure(out, stage)) {
return nullptr;
}
// Maximum nesting depth of composite types
// https://gpuweb.github.io/gpuweb/wgsl/#limits
const size_t nest_depth = 1 + members_nest_depth;
if (nest_depth > kMaxNestDepthOfCompositeType) {
AddError("struct '" + struct_name() + "' has nesting depth of " +
std::to_string(nest_depth) + ", maximum is " +
std::to_string(kMaxNestDepthOfCompositeType),
str->source);
return nullptr;
}
nest_depth_.Add(out, nest_depth);
return out;
}
sem::Statement* Resolver::ReturnStatement(const ast::ReturnStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto& behaviors = current_statement_->Behaviors();
behaviors = sem::Behavior::kReturn;
const type::Type* value_ty = nullptr;
if (auto* value = stmt->value) {
const auto* expr = Load(ValueExpression(value));
if (!expr) {
return false;
}
if (auto* ret_ty = current_function_->ReturnType(); !ret_ty->Is<type::Void>()) {
expr = Materialize(expr, ret_ty);
if (!expr) {
return false;
}
}
behaviors.Add(expr->Behaviors() - sem::Behavior::kNext);
value_ty = expr->Type();
} else {
value_ty = builder_->create<type::Void>();
}
// Validate after processing the return value expression so that its type
// is available for validation.
return validator_.Return(stmt, current_function_->ReturnType(), value_ty,
current_statement_);
});
}
sem::SwitchStatement* Resolver::SwitchStatement(const ast::SwitchStatement* stmt) {
auto* sem = builder_->create<sem::SwitchStatement>(stmt, current_compound_statement_,
current_function_);
return StatementScope(stmt, sem, [&] {
auto& behaviors = sem->Behaviors();
const auto* cond = Load(ValueExpression(stmt->condition));
if (!cond) {
return false;
}
behaviors = cond->Behaviors() - sem::Behavior::kNext;
auto* cond_ty = cond->Type();
// Determine the common type across all selectors and the switch expression
// This must materialize to an integer scalar (non-abstract).
utils::Vector<const type::Type*, 8> types;
types.Push(cond_ty);
for (auto* case_stmt : stmt->body) {
for (auto* sel : case_stmt->selectors) {
if (sel->IsDefault()) {
continue;
}
auto* sem_expr = ValueExpression(sel->expr);
if (!sem_expr) {
return false;
}
types.Push(sem_expr->Type()->UnwrapRef());
}
}
auto* common_ty = type::Type::Common(types);
if (!common_ty || !common_ty->is_integer_scalar()) {
// No common type found or the common type was abstract.
// Pick i32 and let validation deal with any mismatches.
common_ty = builder_->create<type::I32>();
}
cond = Materialize(cond, common_ty);
if (!cond) {
return false;
}
// Handle switch body attributes.
for (auto* attr : stmt->body_attributes) {
Mark(attr);
if (auto* dc = attr->As<ast::DiagnosticAttribute>()) {
if (!DiagnosticControl(dc->control)) {
return false;
}
} else {
AddError("attribute is not valid for switch body", attr->source);
return false;
}
}
if (!validator_.NoDuplicateAttributes(stmt->body_attributes)) {
return false;
}
utils::Vector<sem::CaseStatement*, 4> cases;
cases.Reserve(stmt->body.Length());
for (auto* case_stmt : stmt->body) {
Mark(case_stmt);
auto* c = CaseStatement(case_stmt, common_ty);
if (!c) {
return false;
}
cases.Push(c);
behaviors.Add(c->Behaviors());
sem->Cases().emplace_back(c);
ApplyDiagnosticSeverities(c);
}
if (behaviors.Contains(sem::Behavior::kBreak)) {
behaviors.Add(sem::Behavior::kNext);
}
behaviors.Remove(sem::Behavior::kBreak);
return validator_.SwitchStatement(stmt);
});
}
sem::Statement* Resolver::VariableDeclStatement(const ast::VariableDeclStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
Mark(stmt->variable);
auto* variable = Variable(stmt->variable, /* is_global */ false);
if (!variable) {
return false;
}
for (auto* attr : stmt->variable->attributes) {
Mark(attr);
if (!attr->Is<ast::InternalAttribute>()) {
AddError("attributes are not valid on local variables", attr->source);
return false;
}
}
current_compound_statement_->AddDecl(variable->As<sem::LocalVariable>());
if (auto* ctor = variable->Initializer()) {
sem->Behaviors() = ctor->Behaviors();
}
return validator_.LocalVariable(variable);
});
}
sem::Statement* Resolver::AssignmentStatement(const ast::AssignmentStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto* lhs = ValueExpression(stmt->lhs);
if (!lhs) {
return false;
}
const bool is_phony_assignment = stmt->lhs->Is<ast::PhonyExpression>();
const auto* rhs = ValueExpression(stmt->rhs);
if (!rhs) {
return false;
}
if (!is_phony_assignment) {
rhs = Materialize(rhs, lhs->Type()->UnwrapRef());
if (!rhs) {
return false;
}
}
rhs = Load(rhs);
if (!rhs) {
return false;
}
auto& behaviors = sem->Behaviors();
behaviors = rhs->Behaviors();
if (!is_phony_assignment) {
behaviors.Add(lhs->Behaviors());
}
if (!is_phony_assignment) {
RegisterStore(lhs);
}
return validator_.Assignment(stmt, sem_.TypeOf(stmt->rhs));
});
}
sem::Statement* Resolver::BreakStatement(const ast::BreakStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
sem->Behaviors() = sem::Behavior::kBreak;
return validator_.BreakStatement(sem, current_statement_);
});
}
sem::Statement* Resolver::BreakIfStatement(const ast::BreakIfStatement* stmt) {
auto* sem = builder_->create<sem::BreakIfStatement>(stmt, current_compound_statement_,
current_function_);
return StatementScope(stmt, sem, [&] {
auto* cond = Load(ValueExpression(stmt->condition));
if (!cond) {
return false;
}
sem->SetCondition(cond);
sem->Behaviors() = cond->Behaviors();
sem->Behaviors().Add(sem::Behavior::kBreak);
return validator_.BreakIfStatement(sem, current_statement_);
});
}
sem::Statement* Resolver::CallStatement(const ast::CallStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
if (auto* expr = ValueExpression(stmt->expr)) {
sem->Behaviors() = expr->Behaviors();
return true;
}
return false;
});
}
sem::Statement* Resolver::CompoundAssignmentStatement(
const ast::CompoundAssignmentStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto* lhs = ValueExpression(stmt->lhs);
if (!lhs) {
return false;
}
auto* rhs = Load(ValueExpression(stmt->rhs));
if (!rhs) {
return false;
}
RegisterStore(lhs);
sem->Behaviors() = rhs->Behaviors() + lhs->Behaviors();
auto* lhs_ty = lhs->Type()->UnwrapRef();
auto* rhs_ty = rhs->Type()->UnwrapRef();
auto stage = sem::EarliestStage(lhs->Stage(), rhs->Stage());
auto* ty =
intrinsic_table_->Lookup(stmt->op, lhs_ty, rhs_ty, stage, stmt->source, true).result;
if (!ty) {
return false;
}
return validator_.Assignment(stmt, ty);
});
}
sem::Statement* Resolver::ContinueStatement(const ast::ContinueStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
sem->Behaviors() = sem::Behavior::kContinue;
// Set if we've hit the first continue statement in our parent loop
if (auto* block = sem->FindFirstParent<sem::LoopBlockStatement>()) {
if (!block->FirstContinue()) {
const_cast<sem::LoopBlockStatement*>(block)->SetFirstContinue(
stmt, block->Decls().Count());
}
}
return validator_.ContinueStatement(sem, current_statement_);
});
}
sem::Statement* Resolver::DiscardStatement(const ast::DiscardStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
current_function_->SetDiscardStatement(sem);
return true;
});
}
sem::Statement* Resolver::IncrementDecrementStatement(
const ast::IncrementDecrementStatement* stmt) {
auto* sem =
builder_->create<sem::Statement>(stmt, current_compound_statement_, current_function_);
return StatementScope(stmt, sem, [&] {
auto* lhs = ValueExpression(stmt->lhs);
if (!lhs) {
return false;
}
sem->Behaviors() = lhs->Behaviors();
RegisterStore(lhs);
return validator_.IncrementDecrementStatement(stmt);
});
}
bool Resolver::ApplyAddressSpaceUsageToType(builtin::AddressSpace address_space,
type::Type* ty,
const Source& usage) {
ty = const_cast<type::Type*>(ty->UnwrapRef());
if (auto* str = ty->As<sem::Struct>()) {
if (str->AddressSpaceUsage().count(address_space)) {
return true; // Already applied
}
str->AddUsage(address_space);
for (auto* member : str->Members()) {
auto decl = member->Declaration();
if (decl &&
!ApplyAddressSpaceUsageToType(
address_space, const_cast<type::Type*>(member->Type()), decl->type->source)) {
utils::StringStream err;
err << "while analyzing structure member " << sem_.TypeNameOf(str) << "."
<< builder_->Symbols().NameFor(member->Name());
AddNote(err.str(), member->Source());
return false;
}
}
return true;
}
if (auto* arr = ty->As<type::Array>()) {
if (address_space != builtin::AddressSpace::kStorage) {
if (arr->Count()->Is<type::RuntimeArrayCount>()) {
AddError("runtime-sized arrays can only be used in the <storage> address space",
usage);
return false;
}
auto count = arr->ConstantCount();
if (count.has_value() && count.value() >= kMaxArrayElementCount) {
AddError("array count (" + std::to_string(count.value()) + ") must be less than " +
std::to_string(kMaxArrayElementCount),
usage);
return false;
}
}
return ApplyAddressSpaceUsageToType(address_space, const_cast<type::Type*>(arr->ElemType()),
usage);
}
if (builtin::IsHostShareable(address_space) && !validator_.IsHostShareable(ty)) {
utils::StringStream err;
err << "Type '" << sem_.TypeNameOf(ty) << "' cannot be used in address space '"
<< address_space << "' as it is non-host-shareable";
AddError(err.str(), usage);
return false;
}
return true;
}
template <typename SEM, typename F>
SEM* Resolver::StatementScope(const ast::Statement* ast, SEM* sem, F&& callback) {
builder_->Sem().Add(ast, sem);
auto* as_compound = As<sem::CompoundStatement, CastFlags::kDontErrorOnImpossibleCast>(sem);
// Helper to handle attributes that are supported on certain types of statement.
auto handle_attributes = [&](auto* stmt, sem::Statement* sem_stmt, const char* use) {
for (auto* attr : stmt->attributes) {
Mark(attr);
if (auto* dc = attr->template As<ast::DiagnosticAttribute>()) {
if (!DiagnosticControl(dc->control)) {
return false;
}
} else {
utils::StringStream ss;
ss << "attribute is not valid for " << use;
AddError(ss.str(), attr->source);
return false;
}
}
if (!validator_.NoDuplicateAttributes(stmt->attributes)) {
return false;
}
ApplyDiagnosticSeverities(sem_stmt);
return true;
};
// Handle attributes, if necessary.
// Some statements can take diagnostic filtering attributes, so push a new diagnostic filter
// scope to capture them.
validator_.DiagnosticFilters().Push();
TINT_DEFER(validator_.DiagnosticFilters().Pop());
if (!Switch(
ast, //
[&](const ast::BlockStatement* block) {
return handle_attributes(block, sem, "block statements");
},
[&](const ast::ForLoopStatement* f) {
return handle_attributes(f, sem, "for statements");
},
[&](const ast::IfStatement* i) { return handle_attributes(i, sem, "if statements"); },
[&](const ast::LoopStatement* l) {
return handle_attributes(l, sem, "loop statements");
},
[&](const ast::SwitchStatement* s) {
return handle_attributes(s, sem, "switch statements");
},
[&](const ast::WhileStatement* w) {
return handle_attributes(w, sem, "while statements");
},
[&](Default) { return true; })) {
return nullptr;
}
TINT_SCOPED_ASSIGNMENT(current_statement_, sem);
TINT_SCOPED_ASSIGNMENT(current_compound_statement_,
as_compound ? as_compound : current_compound_statement_);
TINT_SCOPED_ASSIGNMENT(current_scoping_depth_, current_scoping_depth_ + 1);
if (current_scoping_depth_ > kMaxStatementDepth) {
AddError("statement nesting depth / chaining length exceeds limit of " +
std::to_string(kMaxStatementDepth),
ast->source);
return nullptr;
}
if (!callback()) {
return nullptr;
}
return sem;
}
bool Resolver::Mark(const ast::Node* node) {
if (TINT_UNLIKELY(node == nullptr)) {
TINT_ICE(Resolver, diagnostics_) << "Resolver::Mark() called with nullptr";
return false;
}
auto marked_bit_ref = marked_[node->node_id.value];
if (TINT_LIKELY(!marked_bit_ref)) {
marked_bit_ref = true;
return true;
}
TINT_ICE(Resolver, diagnostics_) << "AST node '" << node->TypeInfo().name
<< "' was encountered twice in the same AST of a Program\n"
<< "At: " << node->source << "\n"
<< "Pointer: " << node;
return false;
}
template <typename NODE>
void Resolver::ApplyDiagnosticSeverities(NODE* node) {
for (auto itr : validator_.DiagnosticFilters().Top()) {
node->SetDiagnosticSeverity(itr.key, itr.value);
}
}
bool Resolver::CheckNotTemplated(const char* use, const ast::Identifier* ident) {
if (TINT_UNLIKELY(ident->Is<ast::TemplatedIdentifier>())) {
AddError(std::string(use) + " '" + builder_->Symbols().NameFor(ident->symbol) +
"' does not take template arguments",
ident->source);
if (auto resolved = dependencies_.resolved_identifiers.Get(ident)) {
if (auto* ast_node = resolved->Node()) {
sem_.NoteDeclarationSource(ast_node);
}
}
return false;
}
return true;
}
void Resolver::ErrorMismatchedResolvedIdentifier(const Source& source,
const ResolvedIdentifier& resolved,
std::string_view wanted) {
AddError("cannot use " + resolved.String(builder_->Symbols(), diagnostics_) + " as " +
std::string(wanted),
source);
sem_.NoteDeclarationSource(resolved.Node());
}
void Resolver::AddError(const std::string& msg, const Source& source) const {
diagnostics_.add_error(diag::System::Resolver, msg, source);
}
void Resolver::AddWarning(const std::string& msg, const Source& source) const {
diagnostics_.add_warning(diag::System::Resolver, msg, source);
}
void Resolver::AddNote(const std::string& msg, const Source& source) const {
diagnostics_.add_note(diag::System::Resolver, msg, source);
}
} // namespace tint::resolver