87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
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#include "VM.hpp"
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#include "Value.hpp"
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#include "lib/opcodes.hpp"
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namespace sk
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{
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/*explicit*/ VM::VM()
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{
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}
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/*virtual*/ VM::~VM()
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{
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}
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std::string VM::string() const
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{
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std::stringstream ss;
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ss << "--- constants ---" << "\n";
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for (size_t i=0; i<m_frames.back().program->value_size(); i++)
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{
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ss << i << "\t" << m_frames.back().program->value(i)->string()
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<< "\n";
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}
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ss << "--- stack ---" << "\n";
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for (size_t i=0; i<m_stack.size(); i++)
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{
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ss << i << "\t" << m_stack[i] << "\n";
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}
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return ss.str();
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}
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void VM::exec(std::shared_ptr<Program> program)
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{
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Frame frame;
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frame.program = program;
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m_frames.push_back(frame);
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m_pc = 0;
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exec();
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}
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void VM::exec()
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{
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while (m_pc < program()->size())
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{
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Instr instr = program()->instr(m_pc);
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switch (instr.opcode)
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{
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case OPCODE_PUSH_CONST: {
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push(*instr.param);
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m_pc++;
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} break;
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default:
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throw std::runtime_error {std::string()
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+ "vm cannot execute unknown opcode '"
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+ OpcodeTypeStr[instr.opcode]
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+ "'"};
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}
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}
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}
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std::shared_ptr<Program> VM::program() const
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{
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return m_frames.back().program;
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}
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void VM::push(param_t param)
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{
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m_stack.push_back(param);
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}
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param_t VM::pop()
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{
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assert(m_stack.empty() == false);
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auto param = m_stack.back();
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m_stack.pop_back();
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return param;
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}
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}
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