Implement a Pseudo Objective-C language representation

This is implemented in the Pseudo C plug-in as it shares 99% of the
logic. The Objective-C support is implemented in a subclass of
`PseudoCFunction`. The handling of instruction types that the
Objective-C representation needs to customize is extracted into virtual
functions that the Objective-C subclass overrides.

This currently supports:
 * Rewriting `objc_msgSend` / `objc_msgSendSuper2` with constant
   selectors to `[receiver message]` notation.
 * Rewriting calls to `objc_alloc` / `objc_alloc_init` / `objc_new` to
   the equivalent message send notation.
 * Rewriting `objc_retain` / `objc_release` and friends to the
   equivalent message send notation.
 * Displaying Objective-C class references as their class names rather
   than `_OBJC_CLASS_$_` symbol names.
 * Displaying Objective-C string literals as `@"..."`.

This works best when used in conjunction with
https://github.com/bdash/bn-objc-extras as the reference counting runtime
calls add so much clutter.

1 files changed, 44 insertions, 0 deletions

diff --git a/lang/c/pseudoobjc.h b/lang/c/pseudoobjc.h
new file mode 100644
index 00000000..4b87c7d7
--- /dev/null
+++ b/lang/c/pseudoobjc.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "pseudoc.h"
+
+#include "binaryninjaapi.h"
+
+class PseudoObjCFunction : public PseudoCFunction
+{
+public:
+	PseudoObjCFunction(BinaryNinja::LanguageRepresentationFunctionType* type, BinaryNinja::Architecture* arch,
+		BinaryNinja::Function* owner, BinaryNinja::HighLevelILFunction* highLevelILFunction);
+
+protected:
+	void GetExpr_CALL_OR_TAILCALL(const BinaryNinja::HighLevelILInstruction& instr,
+		BinaryNinja::HighLevelILTokenEmitter& tokens, BinaryNinja::DisassemblySettings* settings,
+		BNOperatorPrecedence precedence, bool statement) override;
+	void GetExpr_CONST_PTR(const BinaryNinja::HighLevelILInstruction& instr,
+		BinaryNinja::HighLevelILTokenEmitter& tokens, BinaryNinja::DisassemblySettings* settings,
+		BNOperatorPrecedence precedence, bool statement) override;
+	void GetExpr_IMPORT(const BinaryNinja::HighLevelILInstruction& instr,
+		BinaryNinja::HighLevelILTokenEmitter& tokens, BinaryNinja::DisassemblySettings* settings,
+		BNOperatorPrecedence precedence, bool statement) override;
+
+private:
+ 	bool GetExpr_ObjCMsgSend(const BinaryNinja::HighLevelILInstruction& expr,
+		BinaryNinja::HighLevelILTokenEmitter& tokens, BinaryNinja::DisassemblySettings* settings,
+		const std::vector<BinaryNinja::HighLevelILInstruction>& parameterExprs);
+	bool GetExpr_GenericObjCRuntimeCall(uint64_t address, const BinaryNinja::HighLevelILInstruction& expr,
+		BinaryNinja::HighLevelILTokenEmitter& tokens, BinaryNinja::DisassemblySettings* settings,
+		const std::vector<BinaryNinja::HighLevelILInstruction>& parameterExprs, const std::vector<std::string_view>& selectorTokens);
+	bool GetExpr_OBJC_CLASS(const BinaryNinja::Symbol& symbol, uint64_t constant,
+		const BinaryNinja::HighLevelILInstruction& expr, BinaryNinja::HighLevelILTokenEmitter& tokens,
+		BinaryNinja::DisassemblySettings* settings, BNOperatorPrecedence precedence, bool statement);
+	bool GetExpr_NSConstantString(BinaryNinja::Ref<BinaryNinja::Type> type, uint64_t constant,
+		const BinaryNinja::HighLevelILInstruction& expr, BinaryNinja::HighLevelILTokenEmitter& tokens,
+		BinaryNinja::DisassemblySettings* settings, BNOperatorPrecedence precedence, bool statement);
+};
+
+class PseudoObjCFunctionType : public PseudoCFunctionType {
+public:
+	PseudoObjCFunctionType();
+	BinaryNinja::Ref<BinaryNinja::LanguageRepresentationFunction> Create(BinaryNinja::Architecture* arch,
+		BinaryNinja::Function* owner, BinaryNinja::HighLevelILFunction* highLevelILFunction) override;
+};