45 lines
770 B
C++
45 lines
770 B
C++
/*
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** Practice runtime for Yab2Cpp
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**
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** by Samuel D. Crow
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*/
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#include "runtime.h"
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#include <cstdio>
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subroutine *callStack=nullptr;
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subroutine::subroutine(unsigned int r)
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{
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this->ret=r;
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this->called=callStack;
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}
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unsigned int subroutine::close()
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{
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if (callStack==nullptr) return STACK_UNDERFLOW_ERROR;
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unsigned int r=callStack->ret;
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subroutine *l=callStack->called;
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delete callStack;
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callStack=l;
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return r;
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}
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int main(int argc, char *argv[])
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{
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unsigned int ret=run();
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switch (ret) {
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case STACK_UNDERFLOW_ERROR:
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puts("Stack Underflow\n");
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break;
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case UNDEFINED_STATE_ERROR:
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puts("Program encountered an undefined state\n");
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break;
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case EXIT:
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return 0;
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default:
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puts("Illegal fallthrough encountered\n");
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break;
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}
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return 1;
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}
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