Rewrite Obj-C workflow in Rust

This is functionally equivalent to the previous workflow_objc, with the
following changes:
1. It mutates the `core.function.metaAnalysis` workflow rather than
   registering a new named workflow. The activities now all check for
   the presence of the Objective-C metadata added by `ObjCProcessor` to
   determine whether they should do work, rather than relying on
   `MachoView` to override the function workflow when Objective-C
   metadata is present. This fixes
   https://github.com/Vector35/binaryninja-api/issues/6779.
2. The auto-inlining of `objc_msgSend` selector stub functions is
   performed in a separate activity from the processing of
   `objc_msgSend` call sites. The selector stub inlining activity is
   configured so that it does not run in `DSCView` as the shared cache
   needs different behavior for stub functions more generally that
   `SharedCacheWorkflow` already provides.
3. The way that types like `id` and `SEL` are referenced is fixed so
   that they show up as `id` rather than `objc_struct*`.

This also replaces the Objective-C portion of the shared cache's
workflow, and incorporates several bug fixes that had been applied to it
but not the standalone Objective-C workflow.

1 files changed, 0 insertions, 102 deletions

diff --git a/plugins/workflow_objc/GlobalState.cpp b/plugins/workflow_objc/GlobalState.cpp
deleted file mode 100644
index 6aff3670..00000000
--- a/plugins/workflow_objc/GlobalState.cpp
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * Copyright (c) 2022-2023 Jon Palmisciano. All rights reserved.
- *
- * Use of this source code is governed by the BSD 3-Clause license; the full
- * terms of the license can be found in the LICENSE.txt file.
- */
-
-#include "GlobalState.h"
-
-#include <set>
-#include <shared_mutex>
-#include <unordered_map>
-
-static std::unordered_map<BinaryViewID, MessageHandler*> g_messageHandlers;
-static std::shared_mutex g_messageHandlerLock;
-static std::unordered_map<BinaryViewID, SharedAnalysisInfo> g_viewInfos;
-static std::shared_mutex g_viewInfoLock;
-static std::set<BinaryViewID> g_ignoredViews;
-
-
-MessageHandler* GlobalState::messageHandler(BinaryViewRef bv)
-{
-    std::unique_lock<std::shared_mutex> lock(g_messageHandlerLock);
-    auto messageHandler = g_messageHandlers.find(id(bv));
-    if (messageHandler != g_messageHandlers.end())
-        return messageHandler->second;
-    auto newMessageHandler = new MessageHandler(bv);
-    g_messageHandlers[id(bv)] = newMessageHandler;
-    return newMessageHandler;
-}
-
-BinaryViewID GlobalState::id(BinaryViewRef bv)
-{
-    return bv->GetFile()->GetSessionId();
-}
-
-void GlobalState::addIgnoredView(BinaryViewRef bv)
-{
-    g_ignoredViews.insert(id(std::move(bv)));
-}
-
-bool GlobalState::viewIsIgnored(BinaryViewRef bv)
-{
-    return g_ignoredViews.count(id(std::move(bv))) > 0;
-}
-
-SharedAnalysisInfo GlobalState::analysisInfo(BinaryViewRef data)
-{
-    {
-        std::shared_lock<std::shared_mutex> lock(g_viewInfoLock);
-        if (auto it = g_viewInfos.find(id(data)); it != g_viewInfos.end())
-            if (data->GetStart() == it->second->imageBase)
-                return it->second;
-    }
-
-    std::unique_lock<std::shared_mutex> lock(g_viewInfoLock);
-    SharedAnalysisInfo info = std::make_shared<AnalysisInfo>();
-    info->imageBase = data->GetStart();
-
-    if (auto objcStubs = data->GetSectionByName("__objc_stubs"))
-    {
-        info->objcStubsStartEnd = {objcStubs->GetStart(), objcStubs->GetEnd()};
-        info->hasObjcStubs = true;
-    }
-
-    auto meta = data->QueryMetadata("Objective-C");
-    if (!meta)
-    {
-        g_viewInfos[id(data)] = info;
-        return info;
-    }
-
-    auto metaKVS = meta->GetKeyValueStore();
-    if (metaKVS["version"]->GetUnsignedInteger() != 1)
-    {
-        BinaryNinja::LogError("workflow_objc: Invalid metadata version received!");
-        g_viewInfos[id(data)] = info;
-        return info;
-    }
-    for (const auto& selAndImps : metaKVS["selRefImplementations"]->GetArray())
-        info->selRefToImp[selAndImps->GetArray()[0]->GetUnsignedInteger()] = selAndImps->GetArray()[1]->GetUnsignedIntegerList();
-    for (const auto& selAndImps : metaKVS["selImplementations"]->GetArray())
-        info->selToImp[selAndImps->GetArray()[0]->GetUnsignedInteger()] = selAndImps->GetArray()[1]->GetUnsignedIntegerList();
-
-    g_viewInfos[id(data)] = info;
-    return info;
-}
-
-bool GlobalState::hasAnalysisInfo(BinaryViewRef data)
-{
-    return data->QueryMetadata("Objective-C") != nullptr;
-}
-
-bool GlobalState::hasFlag(BinaryViewRef bv, const std::string& flag)
-{
-    return bv->QueryMetadata(flag);
-}
-
-void GlobalState::setFlag(BinaryViewRef bv, const std::string& flag)
-{
-    bv->StoreMetadata(flag, new BinaryNinja::Metadata("YES"));
-}