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#ifndef PUSHDOWN_H
#define PUSHDOWN_H
typedef pushdown_value_t stack_value_t;
#include "./stack.h"
typedef enum {
END,
PUSH,
POP,
SKIP,
COPY,
ADD,
SUB,
MUL,
DIV,
SIN,
COS,
TAN,
ASIN,
ACOS,
ATAN,
SINH,
COSH,
TANH,
ASINH,
ACOSH,
ATANH,
EXP,
LOG,
SQRT,
ABS
} pushdown_instruction_t;
void pushdown_run(stack_t *, stack_t *, pushdown_instruction_t *);
#endif
#ifdef PUSHDOWN_IMPLEMENTATION
#include <tgmath.h>
void pushdown_run(stack_t *output, stack_t *input,
pushdown_instruction_t *instructions) {
pushdown_instruction_t *op = instructions;
pushdown_value_t x, y;
while (*op) {
switch (*op) {
case PUSH:
stack_push(output, stack_pop(input));
break;
case POP:
stack_pop(output);
break;
case SKIP:
stack_pop(input);
break;
case COPY:
stack_push(output, stack_peek(output));
break;
case ADD:
x = stack_pop(output);
y = stack_pop(output);
stack_push(output, x + y);
break;
case SUB:
x = stack_pop(output);
y = stack_pop(output);
stack_push(output, x - y);
break;
case MUL:
x = stack_pop(output);
y = stack_pop(output);
stack_push(output, x * y);
break;
case DIV:
x = stack_pop(output);
y = stack_pop(output);
stack_push(output, x / y);
break;
case SIN:
stack_push(output, sin(stack_pop(output)));
break;
case COS:
stack_push(output, cos(stack_pop(output)));
break;
case TAN:
stack_push(output, tan(stack_pop(output)));
break;
case ASIN:
stack_push(output, asin(stack_pop(output)));
break;
case ACOS:
stack_push(output, acos(stack_pop(output)));
break;
case ATAN:
stack_push(output, atan(stack_pop(output)));
break;
case SINH:
stack_push(output, sinh(stack_pop(output)));
break;
case COSH:
stack_push(output, cosh(stack_pop(output)));
break;
case TANH:
stack_push(output, tanh(stack_pop(output)));
break;
case ASINH:
stack_push(output, asinh(stack_pop(output)));
break;
case ACOSH:
stack_push(output, acosh(stack_pop(output)));
break;
case ATANH:
stack_push(output, atanh(stack_pop(output)));
break;
case EXP:
stack_push(output, exp(stack_pop(output)));
break;
case LOG:
stack_push(output, log(stack_pop(output)));
break;
case SQRT:
stack_push(output, sqrt(stack_pop(output)));
break;
case ABS:
stack_push(output, fabs(stack_pop(output)));
break;
}
op++;
}
}
#endif
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