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GH-93678: refactor compiler so that optimizer does not need the assembler and compiler structs #93842

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Merged
iritkatriel merged 16 commits into from
Jun 21, 2022
+170 −160
Merged

GH-93678: refactor compiler so that optimizer does not need the assembler and compiler structs #93842

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6d38e85
optimize_cfg does not require a struct compiler*
iritkatriel Jun 14, 2022
db0be36
optimize_cfg does not require a struct assembler*
iritkatriel Jun 14, 2022
82be9a5
do not pass the whole assembler to functions that need only a_entry
iritkatriel Jun 14, 2022
a2da370
Create struct assember just before assemble_emit. The other optimizer…
iritkatriel Jun 14, 2022
c26a2bb
assemble_jump_offsets doesn't need the compiler
iritkatriel Jun 14, 2022
36d2410
duplicate_exits_without_lineno can use b_next links to iterate
iritkatriel Jun 14, 2022
7f06d70
stackdepth doesn't need the compiler
iritkatriel Jun 14, 2022
5cd8fc9
push_cold_blocks_to_end and duplicate_exits_without_lineno do not nee…
iritkatriel Jun 15, 2022
b1e9f7c
remove 3 unused fields from struct assembler
iritkatriel Jun 15, 2022
b5f58d1
remove obsolete comment
iritkatriel Jun 15, 2022
c4a125e
code review followup
iritkatriel Jun 15, 2022
39f03c0
entry --> entryblock for consistency
iritkatriel Jun 15, 2022
c233570
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 15, 2022
482742a
Merge remote-tracking branch 'upstream/main' into reduce_dependencty_…
iritkatriel Jun 17, 2022
28ba5d9
Merge remote-tracking branch 'upstream/main' into reduce_dependencty_…
iritkatriel Jun 20, 2022
51b78f7
Merge branch 'main' into reduce_dependencty_on_compiler
iritkatriel Jun 20, 2022
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do not pass the whole assembler to functions that need only a_entry
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@iritkatriel
iritkatriel committed Jun 14, 2022
commit 82be9a5aa863aeaa54624e04e1a3d3004c9225e4
35 changes: 17 additions & 18 deletions Python/compile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7728,12 +7728,12 @@ assemble_emit(struct assembler *a, struct instr *i)
}

static void
normalize_jumps(struct assembler *a)
normalize_jumps(basicblock *entryblock)
{
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
b->b_visited = 0;
}
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
b->b_visited = 1;
if (b->b_iused == 0) {
continue;
Expand Down Expand Up @@ -7787,7 +7787,7 @@ normalize_jumps(struct assembler *a)
}

static void
assemble_jump_offsets(struct assembler *a, struct compiler *c)
assemble_jump_offsets(basicblock *entryblock, struct compiler *c)
{
basicblock *b;
int bsize, totsize, extended_arg_recompile;
Expand All @@ -7797,7 +7797,7 @@ assemble_jump_offsets(struct assembler *a, struct compiler *c)
Replace block pointer with position in bytecode. */
do {
totsize = 0;
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
bsize = blocksize(b);
b->b_offset = totsize;
totsize += bsize;
Expand Down Expand Up @@ -7918,17 +7918,17 @@ scan_block_for_local(int target, basicblock *b, bool unsafe_to_start,
#undef MAYBE_PUSH

static int
add_checks_for_loads_of_unknown_variables(struct assembler *a,
add_checks_for_loads_of_unknown_variables(basicblock *entryblock,
struct compiler *c)
{
basicblock **stack = make_cfg_traversal_stack(a->a_entry);
basicblock **stack = make_cfg_traversal_stack(entryblock);
if (stack == NULL) {
return -1;
}
Py_ssize_t nparams = PyList_GET_SIZE(c->u->u_ste->ste_varnames);
int nlocals = (int)PyDict_GET_SIZE(c->u->u_varnames);
for (int target = 0; target < nlocals; target++) {
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
b->b_visited = 0;
}
basicblock **stack_top = stack;
Expand All @@ -7938,10 +7938,10 @@ add_checks_for_loads_of_unknown_variables(struct assembler *a,
// which are the entry block and any DELETE_FAST statements.
if (target >= nparams) {
// only non-parameter locals start out uninitialized.
*(stack_top++) = a->a_entry;
a->a_entry->b_visited = 1;
*(stack_top++) = entryblock;
entryblock->b_visited = 1;
}
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
scan_block_for_local(target, b, false, &stack_top);
}

Expand Down Expand Up @@ -8392,10 +8392,10 @@ insert_prefix_instructions(struct compiler *c, basicblock *entryblock,
* The resulting line number may not be correct according to PEP 626,
* but should be "good enough", and no worse than in older versions. */
static void
guarantee_lineno_for_exits(struct assembler *a, int firstlineno) {
guarantee_lineno_for_exits(basicblock *entryblock, int firstlineno) {
int lineno = firstlineno;
assert(lineno > 0);
for (basicblock *b = a->a_entry; b != NULL; b = b->b_next) {
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
if (b->b_iused == 0) {
continue;
}
Expand Down Expand Up @@ -8594,7 +8594,7 @@ assemble(struct compiler *c, int addNone)
goto error;
}
propagate_line_numbers(entryblock);
guarantee_lineno_for_exits(&a, c->u->u_firstlineno);
guarantee_lineno_for_exits(entryblock, c->u->u_firstlineno);
int maxdepth = stackdepth(c, entryblock);
if (maxdepth < 0) {
goto error;
Expand All @@ -8616,20 +8616,19 @@ assemble(struct compiler *c, int addNone)
}

remove_redundant_jumps(entryblock);
assert(a.a_entry == entryblock);
for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
clean_basic_block(b);
}

/* Order of basic blocks must have been determined by now */
normalize_jumps(&a);
normalize_jumps(entryblock);

if (add_checks_for_loads_of_unknown_variables(&a, c) < 0) {
if (add_checks_for_loads_of_unknown_variables(entryblock, c) < 0) {
goto error;
}

/* Can't modify the bytecode after computing jump offsets. */
assemble_jump_offsets(&a, c);
assemble_jump_offsets(entryblock, c);

/* Emit code. */
for(b = entryblock; b != NULL; b = b->b_next) {
Expand Down