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#include <vector>
#include <llvm/IR/BasicBlock.h>
namespace evmcc
{
using ProgramCounter = uint64_t; // TODO: Rename
class BasicBlock
{
public:
class Stack
{
public:
/// Pushes value on stack
void push(llvm::Value* _value);
/// Pops and returns top value
llvm::Value* pop();
/// Gets _index'th value from top (counting from 0)
llvm::Value* get(size_t _index);
/// Duplicates _index'th value on stack.
void dup(size_t _index);
/// Swaps _index'th value on stack with a value on stack top.
/// @param _index Index of value to be swaped. Cannot be 0.
void swap(size_t _index);
/// Size of the stack
size_t size() const { return m_backend.size(); }
private:
Stack(llvm::BasicBlock* _llvmBB) : m_llvmBB(_llvmBB) {}
Stack(const Stack&) = delete;
void operator=(const Stack&) = delete;
friend BasicBlock;
private:
std::vector<llvm::Value*> m_backend;
/// LLVM Basic Block where phi nodes are inserted
llvm::BasicBlock* const m_llvmBB;
};
/// Basic block name prefix. The rest is beging instruction index.
static const char* NamePrefix;
explicit BasicBlock(ProgramCounter _beginInstIdx, ProgramCounter _endInstIdx, llvm::Function* _mainFunc);
explicit BasicBlock(std::string _name, llvm::Function* _mainFunc);
BasicBlock(const BasicBlock&) = delete;
void operator=(const BasicBlock&) = delete;
operator llvm::BasicBlock*() { return m_llvmBB; }
llvm::BasicBlock* llvm() { return m_llvmBB; }
Stack& getStack() { return m_stack; }
ProgramCounter begin() { return m_beginInstIdx; }
ProgramCounter end() { return m_endInstIdx; }
private:
ProgramCounter const m_beginInstIdx;
ProgramCounter const m_endInstIdx;
llvm::BasicBlock* const m_llvmBB;
/// Basic black state vector (stack) - current/end values and their positions on stack
/// @internal Must be AFTER m_llvmBB
Stack m_stack;
};
}