From dfa141a9719345b6b43ccde7054e9eb78c4039ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <pawel.bylica@imapp.pl>
Date: Fri, 26 Sep 2014 17:23:22 +0200
Subject: [PATCH] Staring with Stack helper

---
 evmcc/Compiler.cpp | 23 ++++++++++++++++++++---
 evmcc/Stack.cpp    | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 3 deletions(-)
 create mode 100644 evmcc/Stack.cpp

diff --git a/evmcc/Compiler.cpp b/evmcc/Compiler.cpp
index fa3349ea2..7478dd683 100644
--- a/evmcc/Compiler.cpp
+++ b/evmcc/Compiler.cpp
@@ -14,6 +14,7 @@ struct
 	llvm::Type* word256ptr;
 	llvm::Type* word256arr;
 	llvm::Type* size;
+	llvm::Type* Void;
 } Types;
 
 Compiler::Compiler()
@@ -25,6 +26,7 @@ Compiler::Compiler()
 	Types.word256ptr = Types.word256->getPointerTo();
 	Types.word256arr = llvm::ArrayType::get(Types.word256, 100);
 	Types.size = llvm::Type::getInt64Ty(context);
+	Types.Void = llvm::Type::getVoidTy(context);
 }
 
 
@@ -44,7 +46,7 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 	auto memSize = new GlobalVariable(*module, Types.size, false,
 		GlobalValue::LinkageTypes::PrivateLinkage,
 		ConstantInt::get(Types.size, 0), "memsize");
-	auto stack = new GlobalVariable(*module, Types.word256arr, false,
+	auto stack2 = new GlobalVariable(*module, Types.word256arr, false,
 		GlobalValue::LinkageTypes::PrivateLinkage,
 		ConstantAggregateZero::get(Types.word256arr), "stack");
 	auto stackTop = new GlobalVariable(*module, Types.size, false,
@@ -52,10 +54,16 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 		ConstantInt::get(Types.size, 0), "stackTop");
 
 	// Create value for void* malloc(size_t)
-	std::vector<Type*> mallocArgTypes = { Types.size };
-	Value* mallocVal = Function::Create(FunctionType::get(Types.word8ptr, mallocArgTypes, false),
+	auto mallocVal = Function::Create(FunctionType::get(Types.word8ptr, { Types.size }, false),
 		GlobalValue::LinkageTypes::ExternalLinkage, "malloc", module.get());
 
+	// Create stack_create declaration
+	auto stackCreate = Function::Create(FunctionType::get(Types.word8ptr, false),
+		GlobalValue::LinkageTypes::ExternalLinkage, "evmccrt_stack_create", module.get());
+
+	auto stackPush = Function::Create(FunctionType::get(Types.Void, std::vector<Type*>{ Types.word8ptr, Types.word256 }, false),
+		GlobalValue::LinkageTypes::ExternalLinkage, "evmccrt_stack_push", module.get());
+
 	// Create main function
 	FunctionType* funcType = FunctionType::get(llvm::Type::getInt32Ty(context), false);
 	Function* mainFunc = Function::Create(funcType, Function::ExternalLinkage, "main", module.get());
@@ -69,6 +77,15 @@ std::unique_ptr<llvm::Module> Compiler::compile(const dev::bytes& bytecode)
 	builder.CreateStore(mallocMemCall, memory);
 	builder.CreateStore(ConstantInt::get(Types.size, 100), memSize);
 
+	auto stack = builder.CreateCall(stackCreate, "stack");
+
+	uint64_t words[] = { 1, 2, 3, 4 };
+	auto val = llvm::APInt(256, 4, words);
+	auto c = ConstantInt::get(Types.word256, val);
+
+	Value* args[] = { stack, c };
+	builder.CreateCall(stackPush, args);
+
 	/*
 	std::vector<Value*> mallocStackArgs = { ConstantInt::get(sizeTy, 200) };
 	auto mallocStackCall = builder.CreateCall(mallocVal, mallocStackArgs, "malloc_stack");
diff --git a/evmcc/Stack.cpp b/evmcc/Stack.cpp
new file mode 100644
index 000000000..e3faffd7e
--- /dev/null
+++ b/evmcc/Stack.cpp
@@ -0,0 +1,46 @@
+
+#include <vector>
+#include <iostream>
+#include <iomanip>
+#include <cstdint>
+
+#ifdef _MSC_VER
+	#define EXPORT __declspec(dllexport)
+#else
+	#define EXPORT
+#endif
+
+struct i256
+{
+	uint64_t a;
+	uint64_t b;
+	uint64_t c;
+	uint64_t d;
+};
+
+using Stack = std::vector<i256>;
+
+extern "C"
+{
+
+EXPORT void* evmccrt_stack_create()
+{
+	std::cerr << "STACK create: ";
+	auto stack = new Stack;
+	std::cerr << stack << "\n";
+	return stack;
+}
+
+EXPORT void evmccrt_stack_push(void* _stack, uint64_t _partA, uint64_t _partB, uint64_t _partC, uint64_t _partD)
+{
+	std::cerr << "STACK push: " << _partA << " (" << std::hex << std::setfill('0')
+			  << std::setw(16) << _partD << " " 
+			  << std::setw(16) << _partC << " " 
+			  << std::setw(16) << _partB << " "
+			  << std::setw(16) << _partA;
+	auto stack = static_cast<Stack*>(_stack);
+	stack->push_back({_partA, _partB, _partC, _partD});
+	std::cerr << ")\n";
+}
+
+}	// extern "C"