9b23badedd
- 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.
124 lines
4.5 KiB
Go
124 lines
4.5 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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// OutputType represents eventual values that carry additional application-specific information.
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type OutputType struct {
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// ElementType is the element type of the output.
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ElementType Type
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}
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// NewOutputType creates a new output type with the given element type after replacing any output or promise types
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// within the element type with their respective element types.
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func NewOutputType(elementType Type) *OutputType {
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return &OutputType{ElementType: ResolveOutputs(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 (*OutputType) SyntaxNode() hclsyntax.Node {
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return syntax.None
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}
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// Traverse attempts to traverse the output type with the given traverser. The result type of traverse(output(T))
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// is output(traverse(T)).
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func (t *OutputType) Traverse(traverser hcl.Traverser) (Traversable, hcl.Diagnostics) {
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element, diagnostics := t.ElementType.Traverse(traverser)
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return NewOutputType(element.(Type)), diagnostics
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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 *OutputType) Equals(other Type) bool {
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return t.equals(other, nil)
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}
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func (t *OutputType) 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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otherOutput, ok := other.(*OutputType)
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return ok && t.ElementType.equals(otherOutput.ElementType, seen)
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}
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// AssignableFrom returns true if this type is assignable from the indicated source type. An output(T) is assignable
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// from values of type output(U), promise(U), and U, where T is assignable from U.
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func (t *OutputType) AssignableFrom(src Type) bool {
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return assignableFrom(t, src, func() bool {
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switch src := src.(type) {
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case *OutputType:
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return t.ElementType.AssignableFrom(src.ElementType)
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case *PromiseType:
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return t.ElementType.AssignableFrom(ResolveOutputs(src.ElementType))
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}
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return t.ElementType.AssignableFrom(src)
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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. An
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// output(T) is convertible from a type U, output(U), or promise(U) if U is convertible to T. If the conversion from
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// U to T is unsafe, the entire conversion is unsafe. Otherwise, the conversion is safe.
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func (t *OutputType) 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 *OutputType) 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 *OutputType:
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return t.ElementType.conversionFrom(src.ElementType, unifying, seen)
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case *PromiseType:
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return t.ElementType.conversionFrom(ResolveOutputs(src.ElementType), unifying, seen)
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}
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return t.ElementType.conversionFrom(src, unifying, seen)
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})
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}
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func (t *OutputType) String() string {
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return t.string(nil)
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}
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func (t *OutputType) string(seen map[Type]struct{}) string {
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return fmt.Sprintf("output(%s)", t.ElementType.string(seen))
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}
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func (t *OutputType) 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 *OutputType:
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// If the other type is an output type, unify based on the element type.
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elementType, conversionKind := t.ElementType.unify(other.ElementType)
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return NewOutputType(elementType), conversionKind
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case *PromiseType:
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// If the other type is a promise type, unify based on the element type.
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elementType, conversionKind := t.ElementType.unify(ResolveOutputs(other.ElementType))
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return NewOutputType(elementType), conversionKind
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default:
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// Prefer the output 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 (t *OutputType) isType() {}
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