src/mesa/shader/slang/slang_label.c

   1
   2
   3 /**
   4  * Functions for managing instruction labels.
   5  * Basically, this is used to manage the problem of forward branches where
   6  * we have a branch instruciton but don't know the target address yet.
   7  */
   8
   9
  10 #include "slang_label.h"
  11
  12
  13 slang_label *
  14 _slang_label_new(const char *name)
  15 {
  16    slang_label *l = (slang_label *) _mesa_calloc(sizeof(slang_label));
  17    if (l) {
  18       l->Name = _mesa_strdup(name);
  19       l->Location = -1;
  20    }
  21    return l;
  22 }
  23
  24 void
  25 _slang_label_delete(slang_label *l)
  26 {
  27    if (l->Name)
  28       _mesa_free(l->Name);
  29    if (l->References)
  30       _mesa_free(l->References);
  31    _mesa_free(l);
  32 }
  33
  34
  35 void
  36 _slang_label_add_reference(slang_label *l, GLuint inst)
  37 {
  38    const GLuint oldSize = l->NumReferences * sizeof(GLuint);
  39    assert(l->Location < 0);
  40    l->References = _mesa_realloc(l->References,
  41                                  oldSize, oldSize + sizeof(GLuint));
  42    if (l->References) {
  43       l->References[l->NumReferences] = inst;
  44       l->NumReferences++;
  45    }
  46 }
  47
  48
  49 GLint
  50 _slang_label_get_location(const slang_label *l)
  51 {
  52    return l->Location;
  53 }
  54
  55
  56 void
  57 _slang_label_set_location(slang_label *l, GLint location,
  58                           struct gl_program *prog)
  59 {
  60    GLuint i;
  61
  62    assert(l->Location < 0);
  63    assert(location >= 0);
  64
  65    l->Location = location;
  66
  67    /* for the instructions that were waiting to learn the label's location: */
  68    for (i = 0; i < l->NumReferences; i++) {
  69       const GLuint j = l->References[i];
  70       prog->Instructions[j].BranchTarget = location;
  71    }
  72
  73    if (l->References) {
  74       _mesa_free(l->References);
  75       l->References = NULL;
  76    }
  77 }