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using System;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Xml.XPath;
using Mono.Cecil;
namespace Mono.Linker.Steps
{
public class BodySubstituterStep : ProcessLinkerXmlStepBase
{
public BodySubstituterStep (XPathDocument document, string xmlDocumentLocation)
: base (document, xmlDocumentLocation)
{
}
public BodySubstituterStep (XPathDocument document, EmbeddedResource resource, AssemblyDefinition resourceAssembly, string xmlDocumentLocation = "")
: base (document, resource, resourceAssembly, xmlDocumentLocation)
{
}
protected override void Process ()
{
ProcessXml (Context.StripSubstitutions, Context.IgnoreSubstitutions);
}
protected override void ProcessAssembly (AssemblyDefinition assembly, XPathNodeIterator iterator, bool warnOnUnresolvedTypes)
{
ProcessTypes (assembly, iterator, warnOnUnresolvedTypes);
ProcessResources (assembly, iterator.Current.SelectChildren ("resource", ""));
}
protected override TypeDefinition ProcessExportedType (ExportedType exported, AssemblyDefinition assembly) => null;
protected override bool ProcessTypePattern (string fullname, AssemblyDefinition assembly, XPathNavigator nav) => false;
protected override void ProcessType (TypeDefinition type, XPathNavigator nav)
{
Debug.Assert (ShouldProcessElement (nav));
if (!nav.HasChildren)
return;
XPathNodeIterator methods = nav.SelectChildren ("method", "");
if (methods.Count > 0)
ProcessMethods (type, methods);
var fields = nav.SelectChildren ("field", "");
if (fields.Count > 0) {
while (fields.MoveNext ()) {
if (!ShouldProcessElement (fields.Current))
continue;
ProcessField (type, fields);
}
}
}
void ProcessMethods (TypeDefinition type, XPathNodeIterator iterator)
{
while (iterator.MoveNext ()) {
if (!ShouldProcessElement (iterator.Current))
continue;
ProcessMethod (type, iterator);
}
}
void ProcessMethod (TypeDefinition type, XPathNodeIterator iterator)
{
string signature = GetAttribute (iterator.Current, "signature");
if (string.IsNullOrEmpty (signature))
return;
MethodDefinition method = FindMethod (type, signature);
if (method == null) {
Context.LogWarning ($"Could not find method '{signature}' on type '{type.GetDisplayName ()}'", 2009, _xmlDocumentLocation);
return;
}
string action = GetAttribute (iterator.Current, "body");
switch (action) {
case "remove":
Annotations.SetAction (method, MethodAction.ConvertToThrow);
return;
case "stub":
string value = GetAttribute (iterator.Current, "value");
if (!string.IsNullOrEmpty (value)) {
if (!TryConvertValue (value, method.ReturnType, out object res)) {
Context.LogWarning ($"Invalid value for '{method.GetDisplayName ()}' stub", 2010, _xmlDocumentLocation);
return;
}
Annotations.SetMethodStubValue (method, res);
}
Annotations.SetAction (method, MethodAction.ConvertToStub);
return;
default:
Context.LogWarning ($"Unknown body modification '{action}' for '{method.GetDisplayName ()}'", 2011, _xmlDocumentLocation);
return;
}
}
void ProcessField (TypeDefinition type, XPathNodeIterator iterator)
{
string name = GetAttribute (iterator.Current, "name");
if (string.IsNullOrEmpty (name))
return;
var field = type.Fields.FirstOrDefault (f => f.Name == name);
if (field == null) {
Context.LogWarning ($"Could not find field '{name}' on type '{type.GetDisplayName ()}'", 2012, _xmlDocumentLocation);
return;
}
if (!field.IsStatic || field.IsLiteral) {
Context.LogWarning ($"Substituted field '{field.GetDisplayName ()}' needs to be static field.", 2013, _xmlDocumentLocation);
return;
}
string value = GetAttribute (iterator.Current, "value");
if (string.IsNullOrEmpty (value)) {
Context.LogWarning ($"Missing 'value' attribute for field '{field.GetDisplayName ()}'.", 2014, _xmlDocumentLocation);
return;
}
if (!TryConvertValue (value, field.FieldType, out object res)) {
Context.LogWarning ($"Invalid value '{value}' for '{field.GetDisplayName ()}'.", 2015, _xmlDocumentLocation);
return;
}
Annotations.SetFieldValue (field, res);
string init = GetAttribute (iterator.Current, "initialize");
if (init?.ToLowerInvariant () == "true") {
Annotations.SetSubstitutedInit (field);
}
}
void ProcessResources (AssemblyDefinition assembly, XPathNodeIterator iterator)
{
while (iterator.MoveNext ()) {
XPathNavigator nav = iterator.Current;
if (!ShouldProcessElement (nav))
continue;
string name = GetAttribute (nav, "name");
if (String.IsNullOrEmpty (name)) {
Context.LogWarning ($"Missing 'name' attribute for resource.", 2038, _xmlDocumentLocation);
continue;
}
string action = GetAttribute (nav, "action");
if (action != "remove") {
Context.LogWarning ($"Invalid value '{action}' for attribute 'action' for resource '{name}'.", 2039, _xmlDocumentLocation);
continue;
}
EmbeddedResource resource = assembly.FindEmbeddedResource (name);
if (resource == null) {
Context.LogWarning ($"Could not find embedded resource '{name}' to remove in assembly '{assembly.Name.Name}'.", 2040, _xmlDocumentLocation);
continue;
}
Context.Annotations.AddResourceToRemove (assembly, resource);
}
}
static MethodDefinition FindMethod (TypeDefinition type, string signature)
{
if (!type.HasMethods)
return null;
foreach (MethodDefinition meth in type.Methods)
if (signature == ResolveFromXmlStep.GetMethodSignature (meth, includeGenericParameters: true))
return meth;
return null;
}
protected override AssemblyDefinition GetAssembly (LinkContext context, AssemblyNameReference assemblyName)
{
return context.GetLoadedAssembly (assemblyName.Name);
}
}
}
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