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GH-132554: "Virtual" iterators (GH-132555)

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* FOR_ITER now pushes either the iterator and NULL or leaves the iterable and pushes tagged zero

* NEXT_ITER uses the tagged int as the index into the sequence or, if TOS is NULL, iterates as before.
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Mark Shannon 2025-05-27 15:59:45 +01:00 • committed by GitHub
parent 9300a596d3
commit f6f4e8a662
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GPG key ID: B5690EEEBB952194
25 changed files with 713 additions and 618 deletions
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17
Python/flowgraph.c
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@ -299,26 +299,34 @@ basicblock_returns(const basicblock *b) {
}
static void
dump_basicblock(const basicblock *b)
dump_basicblock(const basicblock *b, bool highlight)
{
const char *b_return = basicblock_returns(b) ? "return " : "";
if (highlight) {
fprintf(stderr, ">>> ");
}
fprintf(stderr, "%d: [EH=%d CLD=%d WRM=%d NO_FT=%d %p] used: %d, depth: %d, preds: %d %s\n",
b->b_label.id, b->b_except_handler, b->b_cold, b->b_warm, BB_NO_FALLTHROUGH(b), b, b->b_iused,
b->b_startdepth, b->b_predecessors, b_return);
int depth = b->b_startdepth;
if (b->b_instr) {
int i;
for (i = 0; i < b->b_iused; i++) {
fprintf(stderr, " [%02d] ", i);
fprintf(stderr, " [%02d] depth: %d ", i, depth);
dump_instr(b->b_instr + i);
int popped = _PyOpcode_num_popped(b->b_instr[i].i_opcode, b->b_instr[i].i_oparg);
int pushed = _PyOpcode_num_pushed(b->b_instr[i].i_opcode, b->b_instr[i].i_oparg);
depth += (pushed - popped);
}
}
}
void
_PyCfgBuilder_DumpGraph(const basicblock *entryblock)
_PyCfgBuilder_DumpGraph(const basicblock *entryblock, const basicblock *mark)
{
for (const basicblock *b = entryblock; b != NULL; b = b->b_next) {
dump_basicblock(b);
dump_basicblock(b, b == mark);
}
}
@ -2863,6 +2871,7 @@ optimize_load_fast(cfg_builder *g)
// Opcodes that consume no inputs
case GET_ANEXT:
case GET_ITER:
case GET_LEN:
case IMPORT_FROM:
case MATCH_KEYS: