text: /*
  * Copyright (c) 2020 Calvin Rose
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
  * deal in the Software without restriction, including without limitation the
  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  * sell copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */
  
  /* Implements a simple first fit register allocator for the compiler. */
  
  #ifndef JANET_REGALLOC_H
  #define JANET_REGALLOC_H
  
  #include <stdint.h>
  
  /* Placeholder for allocating temporary registers */
  typedef enum {
      JANETC_REGTEMP_0,
      JANETC_REGTEMP_1,
      JANETC_REGTEMP_2,
      JANETC_REGTEMP_3,
      JANETC_REGTEMP_4,
      JANETC_REGTEMP_5,
      JANETC_REGTEMP_6,
      JANETC_REGTEMP_7
  } JanetcRegisterTemp;
  
  typedef struct {
      uint32_t *chunks;
      int32_t count; /* number of chunks in chunks */
      int32_t capacity; /* amount allocated for chunks */
      int32_t max; /* The maximum allocated register so far */
      int32_t regtemps; /* Hold which temp. registers are allocated. */
  } JanetcRegisterAllocator;
  
  void janetc_regalloc_init(JanetcRegisterAllocator *ra);
  void janetc_regalloc_deinit(JanetcRegisterAllocator *ra);
  
  int32_t janetc_regalloc_1(JanetcRegisterAllocator *ra);
  void janetc_regalloc_free(JanetcRegisterAllocator *ra, int32_t reg);
  int32_t janetc_regalloc_temp(JanetcRegisterAllocator *ra, JanetcRegisterTemp nth);
  void janetc_regalloc_freetemp(JanetcRegisterAllocator *ra, int32_t reg, JanetcRegisterTemp nth);
  void janetc_regalloc_clone(JanetcRegisterAllocator *dest, JanetcRegisterAllocator *src);
  void janetc_regalloc_touch(JanetcRegisterAllocator *ra, int32_t reg);
  
  #endif
  