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126 lines
3.6 KiB
126 lines
3.6 KiB
#pragma once
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#include <vector>
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#include <llvm/IR/BasicBlock.h>
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#include "Common.h"
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#include "Stack.h"
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namespace dev
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{
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namespace eth
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{
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namespace jit
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{
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using ProgramCounter = uint64_t; // TODO: Rename
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class BasicBlock
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{
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public:
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class LocalStack
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{
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public:
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/// Pushes value on stack
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void push(llvm::Value* _value);
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/// Pops and returns top value
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llvm::Value* pop();
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/// Duplicates _index'th value on stack
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void dup(size_t _index);
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/// Swaps _index'th value on stack with a value on stack top.
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/// @param _index Index of value to be swaped. Must be > 0.
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void swap(size_t _index);
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private:
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LocalStack(BasicBlock& _owner);
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LocalStack(LocalStack const&) = delete;
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void operator=(LocalStack const&) = delete;
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friend BasicBlock;
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/// Gets _index'th value from top (counting from 0)
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llvm::Value* get(size_t _index);
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/// Sets _index'th value from top (counting from 0)
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void set(size_t _index, llvm::Value* _value);
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std::vector<llvm::Value*>::iterator getItemIterator(size_t _index);
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private:
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BasicBlock& m_bblock;
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};
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/// Basic block name prefix. The rest is instruction index.
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static const char* NamePrefix;
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explicit BasicBlock(code_iterator _begin, code_iterator _end, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest);
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explicit BasicBlock(std::string _name, llvm::Function* _mainFunc, llvm::IRBuilder<>& _builder, bool isJumpDest);
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BasicBlock(const BasicBlock&) = delete;
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BasicBlock& operator=(const BasicBlock&) = delete;
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llvm::BasicBlock* llvm() { return m_llvmBB; }
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code_iterator begin() { return m_begin; }
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code_iterator end() { return m_end; }
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bool isJumpDest() const { return m_isJumpDest; }
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llvm::Value* getJumpTarget() const { return m_jumpTarget; }
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void setJumpTarget(llvm::Value* _jumpTarget) { m_jumpTarget = _jumpTarget; }
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LocalStack& localStack() { return m_stack; }
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/// Optimization: propagates values between local stacks in basic blocks
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/// to avoid excessive pushing/popping on the EVM stack.
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static void linkLocalStacks(std::vector<BasicBlock*> _basicBlocks, llvm::IRBuilder<>& _builder);
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/// Synchronize current local stack with the EVM stack.
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void synchronizeLocalStack(Stack& _evmStack);
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/// Prints local stack and block instructions to stderr.
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/// Useful for calling in a debugger session.
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void dump();
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void dump(std::ostream& os, bool _dotOutput = false);
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private:
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code_iterator const m_begin = {};
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code_iterator const m_end = {};
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llvm::BasicBlock* const m_llvmBB;
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/// Basic black state vector (stack) - current/end values and their positions on stack
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/// @internal Must be AFTER m_llvmBB
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LocalStack m_stack;
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llvm::IRBuilder<>& m_builder;
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/// This stack contains LLVM values that correspond to items found at
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/// the EVM stack when the current basic block starts executing.
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/// Location 0 corresponds to the top of the EVM stack, location 1 is
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/// the item below the top and so on. The stack grows as the code
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/// accesses more items on the EVM stack but once a value is put on
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/// the stack, it will never be replaced.
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std::vector<llvm::Value*> m_initialStack;
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/// This stack tracks the contents of the EVM stack as the basic block
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/// executes. It may grow on both sides, as the code pushes items on
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/// top of the stack or changes existing items.
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std::vector<llvm::Value*> m_currentStack;
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/// How many items higher is the current stack than the initial one.
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/// May be negative.
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int m_tosOffset = 0;
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/// Is the basic block a valid jump destination.
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/// JUMPDEST is the first instruction of the basic block.
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bool const m_isJumpDest = false;
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/// If block finishes with dynamic jump target index is stored here
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llvm::Value* m_jumpTarget = nullptr;
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};
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}
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}
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}
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