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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Mono.Cecil;
namespace Mono.Linker.Steps
{
public class MarkScopeStack
{
public readonly struct Scope
{
public readonly MessageOrigin Origin;
public Scope (in MessageOrigin origin)
{
Origin = origin;
}
}
readonly LinkContext _context;
readonly Stack<Scope> _scopeStack;
readonly struct LocalScope : IDisposable
{
readonly MessageOrigin _origin;
readonly MarkScopeStack _scopeStack;
public LocalScope (in MessageOrigin origin, MarkScopeStack scopeStack)
{
_origin = origin;
_scopeStack = scopeStack;
// Compiler generated methods and types should "inherit" suppression context
// from the user defined method from which the compiler generated them.
// Detecting which method produced which piece of compiler generated code
// is currently not possible in all cases, but in cases where it works
// we will store the suppression context in the SuppressionContextMember.
// For code which is not compiler generated the suppression context
// is the same as the message's origin member.
IMemberDefinition suppressionContextMember = _scopeStack.GetSuppressionContext (origin.MemberDefinition);
_scopeStack.Push (new Scope (new MessageOrigin (origin.MemberDefinition, origin.ILOffset, suppressionContextMember)));
}
public LocalScope (in Scope scope, MarkScopeStack scopeStack)
{
_origin = scope.Origin;
_scopeStack = scopeStack;
_scopeStack.Push (scope);
}
public void Dispose ()
{
Scope scope = _scopeStack.Pop ();
if (_origin.MemberDefinition != scope.Origin.MemberDefinition)
throw new InternalErrorException ($"Scope stack imbalance - expected to pop '{_origin}' but instead popped '{scope.Origin}'.");
}
}
readonly struct ParentScope : IDisposable
{
readonly Scope _parentScope;
readonly Scope _childScope;
readonly MarkScopeStack _scopeStack;
public ParentScope (MarkScopeStack scopeStack)
{
_scopeStack = scopeStack;
_childScope = _scopeStack.Pop ();
_parentScope = _scopeStack.CurrentScope;
}
public void Dispose ()
{
if (_parentScope.Origin.MemberDefinition != _scopeStack.CurrentScope.Origin.MemberDefinition)
throw new InternalErrorException ($"Scope stack imbalance - expected top of stack to be '{_parentScope.Origin}' but instead found '{_scopeStack.CurrentScope.Origin}'.");
_scopeStack.Push (_childScope);
}
}
public MarkScopeStack (LinkContext context)
{
_context = context;
_scopeStack = new Stack<Scope> ();
}
public IDisposable PushScope (in MessageOrigin origin)
{
return new LocalScope (origin, this);
}
public IDisposable PushScope (in Scope scope)
{
return new LocalScope (scope, this);
}
public IDisposable PopToParent ()
{
return new ParentScope (this);
}
public Scope CurrentScope {
get {
if (!_scopeStack.TryPeek (out var result))
throw new InternalErrorException ($"Scope stack imbalance - expected scope but instead the stack is empty.");
return result;
}
}
public void UpdateCurrentScopeInstructionOffset (int offset)
{
var scope = _scopeStack.Pop ();
if (scope.Origin.MemberDefinition is not MethodDefinition)
throw new InternalErrorException ($"Trying to update instruction offset of scope stack which is not a method. Current stack scope is '{scope}'.");
_scopeStack.Push (new Scope (new MessageOrigin (scope.Origin.MemberDefinition, offset, scope.Origin.SuppressionContextMember)));
}
void Push (in Scope scope)
{
_scopeStack.Push (scope);
}
Scope Pop ()
{
if (!_scopeStack.TryPop (out var result))
throw new InternalErrorException ($"Scope stack imbalance - trying to pop empty stack.");
return result;
}
[Conditional ("DEBUG")]
public void AssertIsEmpty () => Debug.Assert (_scopeStack.Count == 0);
IMemberDefinition GetSuppressionContext (IMemberDefinition sourceMember) =>
_context.CompilerGeneratedState.GetUserDefinedMethodForCompilerGeneratedMember (sourceMember) ?? sourceMember;
}
}
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