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Stack.cpp
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#include "Stack.h"
#include "preprocessor/llvm_includes_start.h"
#include <llvm/IR/Function.h>
#include "preprocessor/llvm_includes_end.h"
#include "RuntimeManager.h"
#include "Runtime.h"
#include "Utils.h"
#include <set> // DEBUG only
namespace dev
{
namespace eth
{
namespace jit
{
Stack::Stack(llvm::IRBuilder<>& _builder, RuntimeManager& _runtimeManager):
CompilerHelper(_builder),
m_runtimeManager(_runtimeManager),
m_stack(_builder, "stack")
{}
llvm::Function* Stack::getPushFunc()
{
auto& func = m_push;
if (!func)
{
llvm::Type* argTypes[] = {Type::RuntimePtr, Type::Word};
func = llvm::Function::Create(llvm::FunctionType::get(Type::Void, argTypes, false), llvm::Function::ExternalLinkage, "stack.push", getModule());
llvm::Type* extArgTypes[] = {Type::RuntimePtr, Type::WordPtr};
auto extPushFunc = llvm::Function::Create(llvm::FunctionType::get(Type::Void, extArgTypes, false), llvm::Function::ExternalLinkage, "stack_push", getModule());
auto rt = &func->getArgumentList().front();
rt->setName("rt");
auto value = rt->getNextNode();
value->setName("value");
InsertPointGuard guard{m_builder};
auto entryBB = llvm::BasicBlock::Create(m_builder.getContext(), {}, func);
m_builder.SetInsertPoint(entryBB);
auto a = m_builder.CreateAlloca(Type::Word);
m_builder.CreateStore(value, a);
createCall(extPushFunc, {rt, a});
m_builder.CreateRetVoid();
}
return func;
}
llvm::Function* Stack::getSetFunc()
{
auto& func = m_set;
if (!func)
{
llvm::Type* argTypes[] = {Type::RuntimePtr, Type::Size, Type::Word};
func = llvm::Function::Create(llvm::FunctionType::get(Type::Void, argTypes, false), llvm::Function::ExternalLinkage, "stack.set", getModule());
llvm::Type* extArgTypes[] = {Type::RuntimePtr, Type::Size, Type::WordPtr};
auto extSetFunc = llvm::Function::Create(llvm::FunctionType::get(Type::Void, extArgTypes, false), llvm::Function::ExternalLinkage, "stack_set", getModule());
auto rt = &func->getArgumentList().front();
rt->setName("rt");
auto index = rt->getNextNode();
index->setName("index");
auto value = index->getNextNode();
value->setName("value");
InsertPointGuard guard{m_builder};
auto entryBB = llvm::BasicBlock::Create(m_builder.getContext(), {}, func);
m_builder.SetInsertPoint(entryBB);
auto a = m_builder.CreateAlloca(Type::Word);
m_builder.CreateStore(value, a);
createCall(extSetFunc, {rt, index, a});
m_builder.CreateRetVoid();
}
return func;
}
llvm::Function* Stack::getPopFunc()
{
auto& func = m_pop;
if (!func)
{
llvm::Type* argTypes[] = {Type::RuntimePtr, Type::Size, Type::BytePtr};
func = llvm::Function::Create(llvm::FunctionType::get(Type::Void, argTypes, false), llvm::Function::ExternalLinkage, "stack.pop", getModule());
llvm::Type* extArgTypes[] = {Type::RuntimePtr, Type::Size};
auto extPopFunc = llvm::Function::Create(llvm::FunctionType::get(Type::Bool, extArgTypes, false), llvm::Function::ExternalLinkage, "stack_pop", getModule());
auto rt = &func->getArgumentList().front();
rt->setName("rt");
auto index = rt->getNextNode();
index->setName("index");
auto jmpBuf = index->getNextNode();
jmpBuf->setName("jmpBuf");
InsertPointGuard guard{m_builder};
auto entryBB = llvm::BasicBlock::Create(m_builder.getContext(), {}, func);
auto underflowBB = llvm::BasicBlock::Create(m_builder.getContext(), "Underflow", func);
auto returnBB = llvm::BasicBlock::Create(m_builder.getContext(), "Return", func);
m_builder.SetInsertPoint(entryBB);
auto ok = createCall(extPopFunc, {rt, index});
m_builder.CreateCondBr(ok, returnBB, underflowBB); //TODO: Add branch weight
m_builder.SetInsertPoint(underflowBB);
m_runtimeManager.abort(jmpBuf);
m_builder.CreateUnreachable();
m_builder.SetInsertPoint(returnBB);
m_builder.CreateRetVoid();
}
return func;
}
llvm::Function* Stack::getGetFunc()
{
auto& func = m_get;
if (!func)
{
llvm::Type* argTypes[] = {Type::Size, Type::Size, Type::BytePtr};
func = llvm::Function::Create(llvm::FunctionType::get(Type::Void, argTypes, false), llvm::Function::ExternalLinkage, "stack.require", getModule());
auto index = &func->getArgumentList().front();
index->setName("index");
auto size = index->getNextNode();
size->setName("size");
auto jmpBuf = size->getNextNode();
jmpBuf->setName("jmpBuf");
InsertPointGuard guard{m_builder};
auto entryBB = llvm::BasicBlock::Create(m_builder.getContext(), {}, func);
auto underflowBB = llvm::BasicBlock::Create(m_builder.getContext(), "Underflow", func);
auto returnBB = llvm::BasicBlock::Create(m_builder.getContext(), "Return", func);
m_builder.SetInsertPoint(entryBB);
auto underflow = m_builder.CreateICmpUGE(index, size, "underflow");
m_builder.CreateCondBr(underflow, underflowBB, returnBB);
m_builder.SetInsertPoint(underflowBB);
m_runtimeManager.abort(jmpBuf);
m_builder.CreateUnreachable();
m_builder.SetInsertPoint(returnBB);
m_builder.CreateRetVoid();
}
return func;
}
llvm::Value* Stack::get(size_t _index)
{
createCall(getGetFunc(), {m_builder.getInt64(_index), m_stack.size(), m_runtimeManager.getJmpBuf()});
auto value = m_stack.get(m_builder.CreateSub(m_stack.size(), m_builder.getInt64(_index + 1)));
//return m_builder.CreateLoad(valuePtr);
return value;
}
void Stack::set(size_t _index, llvm::Value* _value)
{
m_stack.set(m_builder.CreateSub(m_stack.size(), m_builder.getInt64(_index + 1)), _value);
}
void Stack::pop(size_t _count)
{
// FIXME: Pop does not check for stack underflow but looks like not needed
// We should place stack.require() check and begining of every BB
m_stack.pop(m_builder.getInt64(_count));
}
void Stack::push(llvm::Value* _value)
{
m_stack.push(_value);
}
}
}
}
extern "C"
{
using namespace dev::eth::jit;
EXPORT void ext_calldataload(RuntimeData* _rtData, i256* _index, byte* o_value)
{
// It asumes all indexes are less than 2^64
auto index = _index->a;
if (_index->b || _index->c || _index->d) // if bigger that 2^64
index = std::numeric_limits<decltype(index)>::max(); // set max to fill with 0 leter
auto data = _rtData->callData;
auto size = _rtData->callDataSize;
for (auto i = 0; i < 32; ++i)
{
if (index < size)
{
o_value[i] = data[index];
++index; // increment only if in range
}
else
o_value[i] = 0;
}
}
} // extern "C"