From 7c61a6daf2052afaba86ad52623028cc8e14572b Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Thu, 31 Aug 2017 13:13:05 +0200
Subject: Add view/pure information about instructions.

---
 libevmasm/SemanticInformation.cpp | 52 +++++++++++++++++++++++++++++++++++++++
 libevmasm/SemanticInformation.h   |  2 ++
 2 files changed, 54 insertions(+)

diff --git a/libevmasm/SemanticInformation.cpp b/libevmasm/SemanticInformation.cpp
index f63f0c61..abe47e10 100644
--- a/libevmasm/SemanticInformation.cpp
+++ b/libevmasm/SemanticInformation.cpp
@@ -188,3 +188,55 @@ bool SemanticInformation::invalidatesStorage(Instruction _instruction)
 		return false;
 	}
 }
+
+bool SemanticInformation::invalidInPureFunctions(Instruction _instruction)
+{
+	switch (_instruction)
+	{
+	case Instruction::ADDRESS:
+	case Instruction::BALANCE:
+	case Instruction::ORIGIN:
+	case Instruction::CALLER:
+	case Instruction::CALLVALUE:
+	case Instruction::GASPRICE:
+	case Instruction::EXTCODESIZE:
+	case Instruction::EXTCODECOPY:
+	case Instruction::BLOCKHASH:
+	case Instruction::COINBASE:
+	case Instruction::TIMESTAMP:
+	case Instruction::NUMBER:
+	case Instruction::DIFFICULTY:
+	case Instruction::GASLIMIT:
+	case Instruction::SLOAD:
+		return true;
+	default:
+		break;
+	}
+	return invalidInViewFunctions(_instruction);
+}
+
+bool SemanticInformation::invalidInViewFunctions(Instruction _instruction)
+{
+	switch (_instruction)
+	{
+	case Instruction::SSTORE:
+	case Instruction::JUMP:
+	case Instruction::JUMPI:
+	case Instruction::GAS:
+	case Instruction::LOG0:
+	case Instruction::LOG1:
+	case Instruction::LOG2:
+	case Instruction::LOG3:
+	case Instruction::LOG4:
+	case Instruction::CREATE:
+	case Instruction::CALL:
+	case Instruction::CALLCODE:
+	case Instruction::DELEGATECALL:
+	case Instruction::CREATE2:
+	case Instruction::SELFDESTRUCT:
+		return true;
+	default:
+		break;
+	}
+	return false;
+}
diff --git a/libevmasm/SemanticInformation.h b/libevmasm/SemanticInformation.h
index 5b02061f..e5ea7c18 100644
--- a/libevmasm/SemanticInformation.h
+++ b/libevmasm/SemanticInformation.h
@@ -53,6 +53,8 @@ struct SemanticInformation
 	static bool invalidatesMemory(solidity::Instruction _instruction);
 	/// @returns true if the given instruction modifies storage (even indirectly).
 	static bool invalidatesStorage(solidity::Instruction _instruction);
+	static bool invalidInPureFunctions(solidity::Instruction _instruction);
+	static bool invalidInViewFunctions(solidity::Instruction _instruction);
 };
 
 }
-- 
cgit