- Lazily produce conversion failure diagnostics. This lowers the allocation volume and cuts down on execution time by avoiding the conversion of source and dest types to strings. - Add a fast path for union conversions that checks if the source type is identical to any of the union's element types. Type equality checks are generally much faster than type conversion checks. These changes lead to a significant speedup in codegen time in azure-native.
140 lines
4.8 KiB
Go
140 lines
4.8 KiB
Go
// Copyright 2016-2020, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"fmt"
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/pulumi/pulumi/pkg/v3/codegen/hcl2/syntax"
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)
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// SetType represents sets of particular element types.
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type SetType struct {
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// ElementType is the element type of the set.
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ElementType Type
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}
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// NewSetType creates a new set type with the given element type.
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func NewSetType(elementType Type) *SetType {
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return &SetType{ElementType: elementType}
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}
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// SyntaxNode returns the syntax node for the type. This is always syntax.None.
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func (*SetType) SyntaxNode() hclsyntax.Node {
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return syntax.None
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}
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// Traverse attempts to traverse the optional type with the given traverser. This always fails.
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func (t *SetType) Traverse(traverser hcl.Traverser) (Traversable, hcl.Diagnostics) {
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return DynamicType, hcl.Diagnostics{unsupportedReceiverType(t, traverser.SourceRange())}
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}
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// Equals returns true if this type has the same identity as the given type.
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func (t *SetType) Equals(other Type) bool {
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return t.equals(other, nil)
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}
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func (t *SetType) equals(other Type, seen map[Type]struct{}) bool {
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if t == other {
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return true
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}
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otherSet, ok := other.(*SetType)
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return ok && t.ElementType.equals(otherSet.ElementType, seen)
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}
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// AssignableFrom returns true if this type is assignable from the indicated source type. A set(T) is assignable
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// from values of type set(U) where T is assignable from U.
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func (t *SetType) AssignableFrom(src Type) bool {
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return assignableFrom(t, src, func() bool {
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if src, ok := src.(*SetType); ok {
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return t.ElementType.AssignableFrom(src.ElementType)
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}
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return false
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})
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}
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// ConversionFrom returns the kind of conversion (if any) that is possible from the source type to this type.
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// A set(T) is convertible from a set(U) if a conversion exists from U to T. If the conversion from U to T is unsafe,
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// the entire conversion is unsafe; otherwise the conversion is safe. An unsafe conversion exists from list(U) or
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// or tuple(U_0 ... U_N) to set(T) if a conversion exists from each U to T.
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func (t *SetType) ConversionFrom(src Type) ConversionKind {
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kind, _ := t.conversionFrom(src, false, nil)
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return kind
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}
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func (t *SetType) conversionFrom(src Type, unifying bool, seen map[Type]struct{}) (ConversionKind, lazyDiagnostics) {
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return conversionFrom(t, src, unifying, seen, func() (ConversionKind, lazyDiagnostics) {
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switch src := src.(type) {
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case *SetType:
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return t.ElementType.conversionFrom(src.ElementType, unifying, seen)
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case *ListType:
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if conversionKind, why := t.ElementType.conversionFrom(src.ElementType, unifying, seen); conversionKind ==
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NoConversion {
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return NoConversion, why
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}
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return UnsafeConversion, nil
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case *TupleType:
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if conversionKind, why := NewListType(t.ElementType).conversionFrom(src, unifying, seen); conversionKind ==
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NoConversion {
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return NoConversion, why
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}
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return UnsafeConversion, nil
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}
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return NoConversion, func() hcl.Diagnostics { return hcl.Diagnostics{typeNotConvertible(t, src)} }
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})
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}
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func (t *SetType) String() string {
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return t.string(nil)
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}
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func (t *SetType) string(seen map[Type]struct{}) string {
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return fmt.Sprintf("set(%s)", t.ElementType.string(seen))
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}
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func (t *SetType) unify(other Type) (Type, ConversionKind) {
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return unify(t, other, func() (Type, ConversionKind) {
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switch other := other.(type) {
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case *SetType:
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// If the other type is a set type, unify based on the element type.
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elementType, conversionKind := t.ElementType.unify(other.ElementType)
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return NewSetType(elementType), conversionKind
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case *ListType:
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// Prefer the list type, but unify the element types.
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element, conversionKind := t.ElementType.unify(other.ElementType)
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return NewListType(element), conversionKind
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case *TupleType:
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// Prefer the set type, but unify the element type.
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elementType, conversionKind := t.ElementType, UnsafeConversion
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for _, other := range other.ElementTypes {
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element, ck := elementType.unify(other)
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if ck < conversionKind {
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conversionKind = ck
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}
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elementType = element
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}
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return NewSetType(elementType), conversionKind
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default:
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// Prefer the set type.
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kind, _ := t.conversionFrom(other, true, nil)
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return t, kind
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}
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})
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}
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func (*SetType) isType() {}
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