Instruction.cpp

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#include "Instruction.h"

#include "preprocessor/llvm_includes_start.h"
#include <llvm/ADT/APInt.h>
#include "preprocessor/llvm_includes_end.h"

namespace dev
{
namespace evmjit
{

llvm::APInt readPushData(code_iterator& _curr, code_iterator _end)
{
        auto pushInst = *_curr;
        assert(Instruction(pushInst) >= Instruction::PUSH1 && Instruction(pushInst) <= Instruction::PUSH32);
        auto numBytes = pushInst - static_cast<size_t>(Instruction::PUSH1) + 1;
        llvm::APInt value(256, 0);
        ++_curr;        // Point the data
        for (decltype(numBytes) i = 0; i < numBytes; ++i)
        {
                byte b = (_curr != _end) ? *_curr++ : 0;
                value <<= 8;
                value |= b;
        }
        --_curr;        // Point the last real byte read
        return value;
}

void skipPushData(code_iterator& _curr, code_iterator _end)
{
        auto pushInst = *_curr;
        assert(Instruction(pushInst) >= Instruction::PUSH1 && Instruction(pushInst) <= Instruction::PUSH32);
        auto numBytes = pushInst - static_cast<size_t>(Instruction::PUSH1) + 1;
        --_end;
        for (decltype(numBytes) i = 0; i < numBytes && _curr < _end; ++i, ++_curr) {}
}

}
}