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codegen.c
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/*
* This file implements the compiler's code generation stage, which
* produces a sequence of pseudo-instructions from an AST.
*
* The primary entry point is _PyCodegen_Body() for modules, and
* _PyCodegen_Expression() for expressions.
*
* CAUTION: The VISIT_* macros abort the current function when they
* encounter a problem. So don't invoke them when there is memory
* which needs to be released. Code blocks are OK, as the compiler
* structure takes care of releasing those. Use the arena to manage
* objects.
*/
#include <stdbool.h>
#include "Python.h"
#include "opcode.h"
#include "pycore_ast.h" // _PyAST_GetDocString()
#define NEED_OPCODE_TABLES
#include "pycore_opcode_utils.h"
#undef NEED_OPCODE_TABLES
#include "pycore_compile.h"
#include "pycore_instruction_sequence.h" // _PyInstructionSequence_NewLabel()
#include "pycore_intrinsics.h"
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_object.h" // _Py_ANNOTATE_FORMAT_VALUE_WITH_FAKE_GLOBALS
#include "pycore_pystate.h" // _Py_GetConfig()
#include "pycore_symtable.h" // PySTEntryObject
#define NEED_OPCODE_METADATA
#include "pycore_opcode_metadata.h" // _PyOpcode_opcode_metadata, _PyOpcode_num_popped/pushed
#undef NEED_OPCODE_METADATA
#define COMP_GENEXP 0
#define COMP_LISTCOMP 1
#define COMP_SETCOMP 2
#define COMP_DICTCOMP 3
/* A soft limit for stack use, to avoid excessive
* memory use for large constants, etc.
*
* The value 30 is plucked out of thin air.
* Code that could use more stack than this is
* rare, so the exact value is unimportant.
*/
#define STACK_USE_GUIDELINE 30
#undef SUCCESS
#undef ERROR
#define SUCCESS 0
#define ERROR -1
#define RETURN_IF_ERROR(X) \
do { \
if ((X) == -1) { \
return ERROR; \
} \
} while (0)
#define RETURN_IF_ERROR_IN_SCOPE(C, CALL) \
do { \
if ((CALL) < 0) { \
_PyCompile_ExitScope((C)); \
return ERROR; \
} \
} while (0)
struct _PyCompiler;
typedef struct _PyCompiler compiler;
#define INSTR_SEQUENCE(C) _PyCompile_InstrSequence(C)
#define FUTURE_FEATURES(C) _PyCompile_FutureFeatures(C)
#define SYMTABLE(C) _PyCompile_Symtable(C)
#define SYMTABLE_ENTRY(C) _PyCompile_SymtableEntry(C)
#define OPTIMIZATION_LEVEL(C) _PyCompile_OptimizationLevel(C)
#define IS_INTERACTIVE_TOP_LEVEL(C) _PyCompile_IsInteractiveTopLevel(C)
#define SCOPE_TYPE(C) _PyCompile_ScopeType(C)
#define QUALNAME(C) _PyCompile_Qualname(C)
#define METADATA(C) _PyCompile_Metadata(C)
typedef _PyInstruction instruction;
typedef _PyInstructionSequence instr_sequence;
typedef _Py_SourceLocation location;
typedef _PyJumpTargetLabel jump_target_label;
typedef _PyCompile_FBlockInfo fblockinfo;
#define LOCATION(LNO, END_LNO, COL, END_COL) \
((const _Py_SourceLocation){(LNO), (END_LNO), (COL), (END_COL)})
#define LOC(x) SRC_LOCATION_FROM_AST(x)
#define NEW_JUMP_TARGET_LABEL(C, NAME) \
jump_target_label NAME = _PyInstructionSequence_NewLabel(INSTR_SEQUENCE(C)); \
if (!IS_JUMP_TARGET_LABEL(NAME)) { \
return ERROR; \
}
#define USE_LABEL(C, LBL) \
RETURN_IF_ERROR(_PyInstructionSequence_UseLabel(INSTR_SEQUENCE(C), (LBL).id))
static const int compare_masks[] = {
[Py_LT] = COMPARISON_LESS_THAN,
[Py_LE] = COMPARISON_LESS_THAN | COMPARISON_EQUALS,
[Py_EQ] = COMPARISON_EQUALS,
[Py_NE] = COMPARISON_NOT_EQUALS,
[Py_GT] = COMPARISON_GREATER_THAN,
[Py_GE] = COMPARISON_GREATER_THAN | COMPARISON_EQUALS,
};
/*
* Resize the array if index is out of range.
*
* idx: the index we want to access
* arr: pointer to the array
* alloc: pointer to the capacity of the array
* default_alloc: initial number of items
* item_size: size of each item
*
*/
int
_PyCompile_EnsureArrayLargeEnough(int idx, void **array, int *alloc,
int default_alloc, size_t item_size)
{
void *arr = *array;
if (arr == NULL) {
int new_alloc = default_alloc;
if (idx >= new_alloc) {
new_alloc = idx + default_alloc;
}
arr = PyMem_Calloc(new_alloc, item_size);
if (arr == NULL) {
PyErr_NoMemory();
return ERROR;
}
*alloc = new_alloc;
}
else if (idx >= *alloc) {
size_t oldsize = *alloc * item_size;
int new_alloc = *alloc << 1;
if (idx >= new_alloc) {
new_alloc = idx + default_alloc;
}
size_t newsize = new_alloc * item_size;
if (oldsize > (SIZE_MAX >> 1)) {
PyErr_NoMemory();
return ERROR;
}
assert(newsize > 0);
void *tmp = PyMem_Realloc(arr, newsize);
if (tmp == NULL) {
PyErr_NoMemory();
return ERROR;
}
*alloc = new_alloc;
arr = tmp;
memset((char *)arr + oldsize, 0, newsize - oldsize);
}
*array = arr;
return SUCCESS;
}
typedef struct {
// A list of strings corresponding to name captures. It is used to track:
// - Repeated name assignments in the same pattern.
// - Different name assignments in alternatives.
// - The order of name assignments in alternatives.
PyObject *stores;
// If 0, any name captures against our subject will raise.
int allow_irrefutable;
// An array of blocks to jump to on failure. Jumping to fail_pop[i] will pop
// i items off of the stack. The end result looks like this (with each block
// falling through to the next):
// fail_pop[4]: POP_TOP
// fail_pop[3]: POP_TOP
// fail_pop[2]: POP_TOP
// fail_pop[1]: POP_TOP
// fail_pop[0]: NOP
jump_target_label *fail_pop;
// The current length of fail_pop.
Py_ssize_t fail_pop_size;
// The number of items on top of the stack that need to *stay* on top of the
// stack. Variable captures go beneath these. All of them will be popped on
// failure.
Py_ssize_t on_top;
} pattern_context;
static int codegen_nameop(compiler *, location, identifier, expr_context_ty);
static int codegen_visit_stmt(compiler *, stmt_ty);
static int codegen_visit_keyword(compiler *, keyword_ty);
static int codegen_visit_expr(compiler *, expr_ty);
static int codegen_augassign(compiler *, stmt_ty);
static int codegen_annassign(compiler *, stmt_ty);
static int codegen_subscript(compiler *, expr_ty);
static int codegen_slice_two_parts(compiler *, expr_ty);
static int codegen_slice(compiler *, expr_ty);
static int codegen_with(compiler *, stmt_ty, int);
static int codegen_async_with(compiler *, stmt_ty, int);
static int codegen_async_for(compiler *, stmt_ty);
static int codegen_call_simple_kw_helper(compiler *c,
location loc,
asdl_keyword_seq *keywords,
Py_ssize_t nkwelts);
static int codegen_call_helper_impl(compiler *c, location loc,
int n, /* Args already pushed */
asdl_expr_seq *args,
PyObject *injected_arg,
asdl_keyword_seq *keywords);
static int codegen_call_helper(compiler *c, location loc,
int n, asdl_expr_seq *args,
asdl_keyword_seq *keywords);
static int codegen_try_except(compiler *, stmt_ty);
static int codegen_try_star_except(compiler *, stmt_ty);
static int codegen_sync_comprehension_generator(
compiler *c, location loc,
asdl_comprehension_seq *generators, int gen_index,
int depth,
expr_ty elt, expr_ty val, int type,
int iter_on_stack);
static int codegen_async_comprehension_generator(
compiler *c, location loc,
asdl_comprehension_seq *generators, int gen_index,
int depth,
expr_ty elt, expr_ty val, int type,
int iter_on_stack);
static int codegen_pattern(compiler *, pattern_ty, pattern_context *);
static int codegen_match(compiler *, stmt_ty);
static int codegen_pattern_subpattern(compiler *,
pattern_ty, pattern_context *);
static int codegen_make_closure(compiler *c, location loc,
PyCodeObject *co, Py_ssize_t flags);
/* Add an opcode with an integer argument */
static int
codegen_addop_i(instr_sequence *seq, int opcode, Py_ssize_t oparg, location loc)
{
/* oparg value is unsigned, but a signed C int is usually used to store
it in the C code (like Python/ceval.c).
Limit to 32-bit signed C int (rather than INT_MAX) for portability.
The argument of a concrete bytecode instruction is limited to 8-bit.
EXTENDED_ARG is used for 16, 24, and 32-bit arguments. */
int oparg_ = Py_SAFE_DOWNCAST(oparg, Py_ssize_t, int);
assert(!IS_ASSEMBLER_OPCODE(opcode));
return _PyInstructionSequence_Addop(seq, opcode, oparg_, loc);
}
#define ADDOP_I(C, LOC, OP, O) \
RETURN_IF_ERROR(codegen_addop_i(INSTR_SEQUENCE(C), (OP), (O), (LOC)))
#define ADDOP_I_IN_SCOPE(C, LOC, OP, O) \
RETURN_IF_ERROR_IN_SCOPE(C, codegen_addop_i(INSTR_SEQUENCE(C), (OP), (O), (LOC)))
static int
codegen_addop_noarg(instr_sequence *seq, int opcode, location loc)
{
assert(!OPCODE_HAS_ARG(opcode));
assert(!IS_ASSEMBLER_OPCODE(opcode));
return _PyInstructionSequence_Addop(seq, opcode, 0, loc);
}
#define ADDOP(C, LOC, OP) \
RETURN_IF_ERROR(codegen_addop_noarg(INSTR_SEQUENCE(C), (OP), (LOC)))
#define ADDOP_IN_SCOPE(C, LOC, OP) \
RETURN_IF_ERROR_IN_SCOPE((C), codegen_addop_noarg(INSTR_SEQUENCE(C), (OP), (LOC)))
static int
codegen_addop_load_const(compiler *c, location loc, PyObject *o)
{
if (PyLong_CheckExact(o)) {
int overflow;
long val = PyLong_AsLongAndOverflow(o, &overflow);
if (!overflow && _PY_IS_SMALL_INT(val)) {
ADDOP_I(c, loc, LOAD_SMALL_INT, val);
return SUCCESS;
}
}
Py_ssize_t arg = _PyCompile_AddConst(c, o);
if (arg < 0) {
return ERROR;
}
ADDOP_I(c, loc, LOAD_CONST, arg);
return SUCCESS;
}
#define ADDOP_LOAD_CONST(C, LOC, O) \
RETURN_IF_ERROR(codegen_addop_load_const((C), (LOC), (O)))
#define ADDOP_LOAD_CONST_IN_SCOPE(C, LOC, O) \
RETURN_IF_ERROR_IN_SCOPE((C), codegen_addop_load_const((C), (LOC), (O)))
/* Same as ADDOP_LOAD_CONST, but steals a reference. */
#define ADDOP_LOAD_CONST_NEW(C, LOC, O) \
do { \
PyObject *__new_const = (O); \
if (__new_const == NULL) { \
return ERROR; \
} \
if (codegen_addop_load_const((C), (LOC), __new_const) < 0) { \
Py_DECREF(__new_const); \
return ERROR; \
} \
Py_DECREF(__new_const); \
} while (0)
static int
codegen_addop_o(compiler *c, location loc,
int opcode, PyObject *dict, PyObject *o)
{
Py_ssize_t arg = _PyCompile_DictAddObj(dict, o);
RETURN_IF_ERROR(arg);
ADDOP_I(c, loc, opcode, arg);
return SUCCESS;
}
#define ADDOP_N(C, LOC, OP, O, TYPE) \
do { \
assert(!OPCODE_HAS_CONST(OP)); /* use ADDOP_LOAD_CONST_NEW */ \
int ret = codegen_addop_o((C), (LOC), (OP), \
METADATA(C)->u_ ## TYPE, (O)); \
Py_DECREF((O)); \
RETURN_IF_ERROR(ret); \
} while (0)
#define ADDOP_N_IN_SCOPE(C, LOC, OP, O, TYPE) \
do { \
assert(!OPCODE_HAS_CONST(OP)); /* use ADDOP_LOAD_CONST_NEW */ \
int ret = codegen_addop_o((C), (LOC), (OP), \
METADATA(C)->u_ ## TYPE, (O)); \
Py_DECREF((O)); \
RETURN_IF_ERROR_IN_SCOPE((C), ret); \
} while (0)
#define LOAD_METHOD -1
#define LOAD_SUPER_METHOD -2
#define LOAD_ZERO_SUPER_ATTR -3
#define LOAD_ZERO_SUPER_METHOD -4
static int
codegen_addop_name(compiler *c, location loc,
int opcode, PyObject *dict, PyObject *o)
{
PyObject *mangled = _PyCompile_MaybeMangle(c, o);
if (!mangled) {
return ERROR;
}
Py_ssize_t arg = _PyCompile_DictAddObj(dict, mangled);
Py_DECREF(mangled);
if (arg < 0) {
return ERROR;
}
if (opcode == LOAD_ATTR) {
arg <<= 1;
}
if (opcode == LOAD_METHOD) {
opcode = LOAD_ATTR;
arg <<= 1;
arg |= 1;
}
if (opcode == LOAD_SUPER_ATTR) {
arg <<= 2;
arg |= 2;
}
if (opcode == LOAD_SUPER_METHOD) {
opcode = LOAD_SUPER_ATTR;
arg <<= 2;
arg |= 3;
}
if (opcode == LOAD_ZERO_SUPER_ATTR) {
opcode = LOAD_SUPER_ATTR;
arg <<= 2;
}
if (opcode == LOAD_ZERO_SUPER_METHOD) {
opcode = LOAD_SUPER_ATTR;
arg <<= 2;
arg |= 1;
}
ADDOP_I(c, loc, opcode, arg);
return SUCCESS;
}
#define ADDOP_NAME(C, LOC, OP, O, TYPE) \
RETURN_IF_ERROR(codegen_addop_name((C), (LOC), (OP), METADATA(C)->u_ ## TYPE, (O)))
static int
codegen_addop_j(instr_sequence *seq, location loc,
int opcode, jump_target_label target)
{
assert(IS_JUMP_TARGET_LABEL(target));
assert(OPCODE_HAS_JUMP(opcode) || IS_BLOCK_PUSH_OPCODE(opcode));
assert(!IS_ASSEMBLER_OPCODE(opcode));
return _PyInstructionSequence_Addop(seq, opcode, target.id, loc);
}
#define ADDOP_JUMP(C, LOC, OP, O) \
RETURN_IF_ERROR(codegen_addop_j(INSTR_SEQUENCE(C), (LOC), (OP), (O)))
#define ADDOP_COMPARE(C, LOC, CMP) \
RETURN_IF_ERROR(codegen_addcompare((C), (LOC), (cmpop_ty)(CMP)))
#define ADDOP_BINARY(C, LOC, BINOP) \
RETURN_IF_ERROR(addop_binary((C), (LOC), (BINOP), false))
#define ADDOP_INPLACE(C, LOC, BINOP) \
RETURN_IF_ERROR(addop_binary((C), (LOC), (BINOP), true))
#define ADD_YIELD_FROM(C, LOC, await) \
RETURN_IF_ERROR(codegen_add_yield_from((C), (LOC), (await)))
#define POP_EXCEPT_AND_RERAISE(C, LOC) \
RETURN_IF_ERROR(codegen_pop_except_and_reraise((C), (LOC)))
#define ADDOP_YIELD(C, LOC) \
RETURN_IF_ERROR(codegen_addop_yield((C), (LOC)))
/* VISIT and VISIT_SEQ takes an ASDL type as their second argument. They use
the ASDL name to synthesize the name of the C type and the visit function.
*/
#define VISIT(C, TYPE, V) \
RETURN_IF_ERROR(codegen_visit_ ## TYPE((C), (V)))
#define VISIT_IN_SCOPE(C, TYPE, V) \
RETURN_IF_ERROR_IN_SCOPE((C), codegen_visit_ ## TYPE((C), (V)))
#define VISIT_SEQ(C, TYPE, SEQ) \
do { \
asdl_ ## TYPE ## _seq *seq = (SEQ); /* avoid variable capture */ \
for (int _i = 0; _i < asdl_seq_LEN(seq); _i++) { \
TYPE ## _ty elt = (TYPE ## _ty)asdl_seq_GET(seq, _i); \
RETURN_IF_ERROR(codegen_visit_ ## TYPE((C), elt)); \
} \
} while (0)
#define VISIT_SEQ_IN_SCOPE(C, TYPE, SEQ) \
do { \
asdl_ ## TYPE ## _seq *seq = (SEQ); /* avoid variable capture */ \
for (int _i = 0; _i < asdl_seq_LEN(seq); _i++) { \
TYPE ## _ty elt = (TYPE ## _ty)asdl_seq_GET(seq, _i); \
if (codegen_visit_ ## TYPE((C), elt) < 0) { \
_PyCompile_ExitScope(C); \
return ERROR; \
} \
} \
} while (0)
static int
codegen_call_exit_with_nones(compiler *c, location loc)
{
ADDOP_LOAD_CONST(c, loc, Py_None);
ADDOP_LOAD_CONST(c, loc, Py_None);
ADDOP_LOAD_CONST(c, loc, Py_None);
ADDOP_I(c, loc, CALL, 3);
return SUCCESS;
}
static int
codegen_add_yield_from(compiler *c, location loc, int await)
{
NEW_JUMP_TARGET_LABEL(c, send);
NEW_JUMP_TARGET_LABEL(c, fail);
NEW_JUMP_TARGET_LABEL(c, exit);
USE_LABEL(c, send);
ADDOP_JUMP(c, loc, SEND, exit);
// Set up a virtual try/except to handle when StopIteration is raised during
// a close or throw call. The only way YIELD_VALUE raises if they do!
ADDOP_JUMP(c, loc, SETUP_FINALLY, fail);
ADDOP_I(c, loc, YIELD_VALUE, 1);
ADDOP(c, NO_LOCATION, POP_BLOCK);
ADDOP_I(c, loc, RESUME, await ? RESUME_AFTER_AWAIT : RESUME_AFTER_YIELD_FROM);
ADDOP_JUMP(c, loc, JUMP_NO_INTERRUPT, send);
USE_LABEL(c, fail);
ADDOP(c, loc, CLEANUP_THROW);
USE_LABEL(c, exit);
ADDOP(c, loc, END_SEND);
return SUCCESS;
}
static int
codegen_pop_except_and_reraise(compiler *c, location loc)
{
/* Stack contents
* [exc_info, lasti, exc] COPY 3
* [exc_info, lasti, exc, exc_info] POP_EXCEPT
* [exc_info, lasti, exc] RERAISE 1
* (exception_unwind clears the stack)
*/
ADDOP_I(c, loc, COPY, 3);
ADDOP(c, loc, POP_EXCEPT);
ADDOP_I(c, loc, RERAISE, 1);
return SUCCESS;
}
/* Unwind a frame block. If preserve_tos is true, the TOS before
* popping the blocks will be restored afterwards, unless another
* return, break or continue is found. In which case, the TOS will
* be popped.
*/
static int
codegen_unwind_fblock(compiler *c, location *ploc,
fblockinfo *info, int preserve_tos)
{
switch (info->fb_type) {
case COMPILE_FBLOCK_WHILE_LOOP:
case COMPILE_FBLOCK_EXCEPTION_HANDLER:
case COMPILE_FBLOCK_EXCEPTION_GROUP_HANDLER:
case COMPILE_FBLOCK_ASYNC_COMPREHENSION_GENERATOR:
case COMPILE_FBLOCK_STOP_ITERATION:
return SUCCESS;
case COMPILE_FBLOCK_FOR_LOOP:
/* Pop the iterator */
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 2);
}
ADDOP(c, *ploc, POP_TOP);
return SUCCESS;
case COMPILE_FBLOCK_TRY_EXCEPT:
ADDOP(c, *ploc, POP_BLOCK);
return SUCCESS;
case COMPILE_FBLOCK_FINALLY_TRY:
/* This POP_BLOCK gets the line number of the unwinding statement */
ADDOP(c, *ploc, POP_BLOCK);
if (preserve_tos) {
RETURN_IF_ERROR(
_PyCompile_PushFBlock(c, *ploc, COMPILE_FBLOCK_POP_VALUE,
NO_LABEL, NO_LABEL, NULL));
}
/* Emit the finally block */
VISIT_SEQ(c, stmt, info->fb_datum);
if (preserve_tos) {
_PyCompile_PopFBlock(c, COMPILE_FBLOCK_POP_VALUE, NO_LABEL);
}
/* The finally block should appear to execute after the
* statement causing the unwinding, so make the unwinding
* instruction artificial */
*ploc = NO_LOCATION;
return SUCCESS;
case COMPILE_FBLOCK_FINALLY_END:
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 2);
}
ADDOP(c, *ploc, POP_TOP); /* exc_value */
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 2);
}
ADDOP(c, *ploc, POP_BLOCK);
ADDOP(c, *ploc, POP_EXCEPT);
return SUCCESS;
case COMPILE_FBLOCK_WITH:
case COMPILE_FBLOCK_ASYNC_WITH:
*ploc = info->fb_loc;
ADDOP(c, *ploc, POP_BLOCK);
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 3);
ADDOP_I(c, *ploc, SWAP, 2);
}
RETURN_IF_ERROR(codegen_call_exit_with_nones(c, *ploc));
if (info->fb_type == COMPILE_FBLOCK_ASYNC_WITH) {
ADDOP_I(c, *ploc, GET_AWAITABLE, 2);
ADDOP_LOAD_CONST(c, *ploc, Py_None);
ADD_YIELD_FROM(c, *ploc, 1);
}
ADDOP(c, *ploc, POP_TOP);
/* The exit block should appear to execute after the
* statement causing the unwinding, so make the unwinding
* instruction artificial */
*ploc = NO_LOCATION;
return SUCCESS;
case COMPILE_FBLOCK_HANDLER_CLEANUP: {
if (info->fb_datum) {
ADDOP(c, *ploc, POP_BLOCK);
}
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 2);
}
ADDOP(c, *ploc, POP_BLOCK);
ADDOP(c, *ploc, POP_EXCEPT);
if (info->fb_datum) {
ADDOP_LOAD_CONST(c, *ploc, Py_None);
RETURN_IF_ERROR(codegen_nameop(c, *ploc, info->fb_datum, Store));
RETURN_IF_ERROR(codegen_nameop(c, *ploc, info->fb_datum, Del));
}
return SUCCESS;
}
case COMPILE_FBLOCK_POP_VALUE: {
if (preserve_tos) {
ADDOP_I(c, *ploc, SWAP, 2);
}
ADDOP(c, *ploc, POP_TOP);
return SUCCESS;
}
}
Py_UNREACHABLE();
}
/** Unwind block stack. If loop is not NULL, then stop when the first loop is encountered. */
static int
codegen_unwind_fblock_stack(compiler *c, location *ploc,
int preserve_tos, fblockinfo **loop)
{
fblockinfo *top = _PyCompile_TopFBlock(c);
if (top == NULL) {
return SUCCESS;
}
if (top->fb_type == COMPILE_FBLOCK_EXCEPTION_GROUP_HANDLER) {
return _PyCompile_Error(
c, *ploc, "'break', 'continue' and 'return' cannot appear in an except* block");
}
if (loop != NULL && (top->fb_type == COMPILE_FBLOCK_WHILE_LOOP ||
top->fb_type == COMPILE_FBLOCK_FOR_LOOP)) {
*loop = top;
return SUCCESS;
}
fblockinfo copy = *top;
_PyCompile_PopFBlock(c, top->fb_type, top->fb_block);
RETURN_IF_ERROR(codegen_unwind_fblock(c, ploc, ©, preserve_tos));
RETURN_IF_ERROR(codegen_unwind_fblock_stack(c, ploc, preserve_tos, loop));
_PyCompile_PushFBlock(c, copy.fb_loc, copy.fb_type, copy.fb_block,
copy.fb_exit, copy.fb_datum);
return SUCCESS;
}
static int
codegen_enter_scope(compiler *c, identifier name, int scope_type,
void *key, int lineno, PyObject *private,
_PyCompile_CodeUnitMetadata *umd)
{
RETURN_IF_ERROR(
_PyCompile_EnterScope(c, name, scope_type, key, lineno, private, umd));
location loc = LOCATION(lineno, lineno, 0, 0);
if (scope_type == COMPILE_SCOPE_MODULE) {
loc.lineno = 0;
}
ADDOP_I(c, loc, RESUME, RESUME_AT_FUNC_START);
return SUCCESS;
}
static int
codegen_setup_annotations_scope(compiler *c, location loc,
void *key, PyObject *name)
{
_PyCompile_CodeUnitMetadata umd = {
.u_posonlyargcount = 1,
};
RETURN_IF_ERROR(
codegen_enter_scope(c, name, COMPILE_SCOPE_ANNOTATIONS,
key, loc.lineno, NULL, &umd));
// if .format > VALUE_WITH_FAKE_GLOBALS: raise NotImplementedError
PyObject *value_with_fake_globals = PyLong_FromLong(_Py_ANNOTATE_FORMAT_VALUE_WITH_FAKE_GLOBALS);
assert(!SYMTABLE_ENTRY(c)->ste_has_docstring);
_Py_DECLARE_STR(format, ".format");
ADDOP_I(c, loc, LOAD_FAST, 0);
ADDOP_LOAD_CONST(c, loc, value_with_fake_globals);
ADDOP_I(c, loc, COMPARE_OP, (Py_GT << 5) | compare_masks[Py_GT]);
NEW_JUMP_TARGET_LABEL(c, body);
ADDOP_JUMP(c, loc, POP_JUMP_IF_FALSE, body);
ADDOP_I(c, loc, LOAD_COMMON_CONSTANT, CONSTANT_NOTIMPLEMENTEDERROR);
ADDOP_I(c, loc, RAISE_VARARGS, 1);
USE_LABEL(c, body);
return SUCCESS;
}
static int
codegen_leave_annotations_scope(compiler *c, location loc,
Py_ssize_t annotations_len)
{
ADDOP_I(c, loc, BUILD_MAP, annotations_len);
ADDOP_IN_SCOPE(c, loc, RETURN_VALUE);
PyCodeObject *co = _PyCompile_OptimizeAndAssemble(c, 1);
// We want the parameter to __annotate__ to be named "format" in the
// signature shown by inspect.signature(), but we need to use a
// different name (.format) in the symtable; if the name
// "format" appears in the annotations, it doesn't get clobbered
// by this name. This code is essentially:
// co->co_localsplusnames = ("format", *co->co_localsplusnames[1:])
const Py_ssize_t size = PyObject_Size(co->co_localsplusnames);
if (size == -1) {
return ERROR;
}
PyObject *new_names = PyTuple_New(size);
if (new_names == NULL) {
return ERROR;
}
PyTuple_SET_ITEM(new_names, 0, Py_NewRef(&_Py_ID(format)));
for (int i = 1; i < size; i++) {
PyObject *item = PyTuple_GetItem(co->co_localsplusnames, i);
if (item == NULL) {
Py_DECREF(new_names);
return ERROR;
}
Py_INCREF(item);
PyTuple_SET_ITEM(new_names, i, item);
}
Py_SETREF(co->co_localsplusnames, new_names);
_PyCompile_ExitScope(c);
if (co == NULL) {
return ERROR;
}
int ret = codegen_make_closure(c, loc, co, 0);
Py_DECREF(co);
RETURN_IF_ERROR(ret);
return SUCCESS;
}
static int
codegen_process_deferred_annotations(compiler *c, location loc)
{
PyObject *deferred_anno = _PyCompile_DeferredAnnotations(c);
if (deferred_anno == NULL) {
return SUCCESS;
}
Py_INCREF(deferred_anno);
// It's possible that ste_annotations_block is set but
// u_deferred_annotations is not, because the former is still
// set if there are only non-simple annotations (i.e., annotations
// for attributes, subscripts, or parenthesized names). However, the
// reverse should not be possible.
PySTEntryObject *ste = SYMTABLE_ENTRY(c);
assert(ste->ste_annotation_block != NULL);
void *key = (void *)((uintptr_t)ste->ste_id + 1);
if (codegen_setup_annotations_scope(c, loc, key,
ste->ste_annotation_block->ste_name) < 0) {
Py_DECREF(deferred_anno);
return ERROR;
}
Py_ssize_t annotations_len = PyList_Size(deferred_anno);
for (Py_ssize_t i = 0; i < annotations_len; i++) {
PyObject *ptr = PyList_GET_ITEM(deferred_anno, i);
stmt_ty st = (stmt_ty)PyLong_AsVoidPtr(ptr);
if (st == NULL) {
_PyCompile_ExitScope(c);
Py_DECREF(deferred_anno);
return ERROR;
}
PyObject *mangled = _PyCompile_Mangle(c, st->v.AnnAssign.target->v.Name.id);
if (!mangled) {
_PyCompile_ExitScope(c);
Py_DECREF(deferred_anno);
return ERROR;
}
ADDOP_LOAD_CONST_NEW(c, LOC(st), mangled);
VISIT(c, expr, st->v.AnnAssign.annotation);
}
Py_DECREF(deferred_anno);
RETURN_IF_ERROR(codegen_leave_annotations_scope(c, loc, annotations_len));
RETURN_IF_ERROR(codegen_nameop(c, loc, &_Py_ID(__annotate__), Store));
return SUCCESS;
}
/* Compile an expression */
int
_PyCodegen_Expression(compiler *c, expr_ty e)
{
VISIT(c, expr, e);
return SUCCESS;
}
/* Compile a sequence of statements, checking for a docstring
and for annotations. */
int
_PyCodegen_Body(compiler *c, location loc, asdl_stmt_seq *stmts, bool is_interactive)
{
/* If from __future__ import annotations is active,
* every annotated class and module should have __annotations__.
* Else __annotate__ is created when necessary. */
PySTEntryObject *ste = SYMTABLE_ENTRY(c);
if ((FUTURE_FEATURES(c) & CO_FUTURE_ANNOTATIONS) && ste->ste_annotations_used) {
ADDOP(c, loc, SETUP_ANNOTATIONS);
}
if (!asdl_seq_LEN(stmts)) {
return SUCCESS;
}
Py_ssize_t first_instr = 0;
if (!is_interactive) { /* A string literal on REPL prompt is not a docstring */
if (ste->ste_has_docstring) {
PyObject *docstring = _PyAST_GetDocString(stmts);
assert(docstring);
first_instr = 1;
/* set docstring */
assert(OPTIMIZATION_LEVEL(c) < 2);
PyObject *cleandoc = _PyCompile_CleanDoc(docstring);
if (cleandoc == NULL) {
return ERROR;
}
stmt_ty st = (stmt_ty)asdl_seq_GET(stmts, 0);
assert(st->kind == Expr_kind);
location loc = LOC(st->v.Expr.value);
ADDOP_LOAD_CONST(c, loc, cleandoc);
Py_DECREF(cleandoc);
RETURN_IF_ERROR(codegen_nameop(c, NO_LOCATION, &_Py_ID(__doc__), Store));
}
}
for (Py_ssize_t i = first_instr; i < asdl_seq_LEN(stmts); i++) {
VISIT(c, stmt, (stmt_ty)asdl_seq_GET(stmts, i));
}
// If there are annotations and the future import is not on, we
// collect the annotations in a separate pass and generate an
// __annotate__ function. See PEP 649.
if (!(FUTURE_FEATURES(c) & CO_FUTURE_ANNOTATIONS)) {
RETURN_IF_ERROR(codegen_process_deferred_annotations(c, loc));
}
return SUCCESS;
}
int
_PyCodegen_EnterAnonymousScope(compiler* c, mod_ty mod)
{
_Py_DECLARE_STR(anon_module, "<module>");
RETURN_IF_ERROR(
codegen_enter_scope(c, &_Py_STR(anon_module), COMPILE_SCOPE_MODULE,
mod, 1, NULL, NULL));
return SUCCESS;
}
static int
codegen_make_closure(compiler *c, location loc,
PyCodeObject *co, Py_ssize_t flags)
{
if (co->co_nfreevars) {
int i = PyUnstable_Code_GetFirstFree(co);
for (; i < co->co_nlocalsplus; ++i) {
/* Bypass com_addop_varname because it will generate
LOAD_DEREF but LOAD_CLOSURE is needed.
*/
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
int arg = _PyCompile_LookupArg(c, co, name);
RETURN_IF_ERROR(arg);
ADDOP_I(c, loc, LOAD_CLOSURE, arg);
}
flags |= MAKE_FUNCTION_CLOSURE;
ADDOP_I(c, loc, BUILD_TUPLE, co->co_nfreevars);
}
ADDOP_LOAD_CONST(c, loc, (PyObject*)co);
ADDOP(c, loc, MAKE_FUNCTION);
if (flags & MAKE_FUNCTION_CLOSURE) {
ADDOP_I(c, loc, SET_FUNCTION_ATTRIBUTE, MAKE_FUNCTION_CLOSURE);
}
if (flags & MAKE_FUNCTION_ANNOTATIONS) {
ADDOP_I(c, loc, SET_FUNCTION_ATTRIBUTE, MAKE_FUNCTION_ANNOTATIONS);
}
if (flags & MAKE_FUNCTION_ANNOTATE) {
ADDOP_I(c, loc, SET_FUNCTION_ATTRIBUTE, MAKE_FUNCTION_ANNOTATE);
}
if (flags & MAKE_FUNCTION_KWDEFAULTS) {
ADDOP_I(c, loc, SET_FUNCTION_ATTRIBUTE, MAKE_FUNCTION_KWDEFAULTS);
}
if (flags & MAKE_FUNCTION_DEFAULTS) {
ADDOP_I(c, loc, SET_FUNCTION_ATTRIBUTE, MAKE_FUNCTION_DEFAULTS);
}
return SUCCESS;
}
static int
codegen_decorators(compiler *c, asdl_expr_seq* decos)
{
if (!decos) {
return SUCCESS;
}
for (Py_ssize_t i = 0; i < asdl_seq_LEN(decos); i++) {
VISIT(c, expr, (expr_ty)asdl_seq_GET(decos, i));
}
return SUCCESS;
}
static int
codegen_apply_decorators(compiler *c, asdl_expr_seq* decos)
{
if (!decos) {
return SUCCESS;
}
for (Py_ssize_t i = asdl_seq_LEN(decos) - 1; i > -1; i--) {
location loc = LOC((expr_ty)asdl_seq_GET(decos, i));
ADDOP_I(c, loc, CALL, 0);
}
return SUCCESS;
}
static int
codegen_kwonlydefaults(compiler *c, location loc,
asdl_arg_seq *kwonlyargs, asdl_expr_seq *kw_defaults)
{
/* Push a dict of keyword-only default values.
Return -1 on error, 0 if no dict pushed, 1 if a dict is pushed.
*/
int default_count = 0;
for (int i = 0; i < asdl_seq_LEN(kwonlyargs); i++) {
arg_ty arg = asdl_seq_GET(kwonlyargs, i);
expr_ty default_ = asdl_seq_GET(kw_defaults, i);
if (default_) {
default_count++;
PyObject *mangled = _PyCompile_MaybeMangle(c, arg->arg);
if (!mangled) {
return ERROR;
}
ADDOP_LOAD_CONST_NEW(c, loc, mangled);
VISIT(c, expr, default_);
}
}
if (default_count) {
ADDOP_I(c, loc, BUILD_MAP, default_count);
return 1;
}
else {
return 0;
}
}
static int
codegen_visit_annexpr(compiler *c, expr_ty annotation)
{
location loc = LOC(annotation);
ADDOP_LOAD_CONST_NEW(c, loc, _PyAST_ExprAsUnicode(annotation));
return SUCCESS;
}
static int
codegen_argannotation(compiler *c, identifier id,
expr_ty annotation, Py_ssize_t *annotations_len, location loc)
{
if (!annotation) {
return SUCCESS;
}
PyObject *mangled = _PyCompile_MaybeMangle(c, id);
if (!mangled) {
return ERROR;
}
ADDOP_LOAD_CONST(c, loc, mangled);
Py_DECREF(mangled);
if (FUTURE_FEATURES(c) & CO_FUTURE_ANNOTATIONS) {
VISIT(c, annexpr, annotation);
}
else {
if (annotation->kind == Starred_kind) {
// *args: *Ts (where Ts is a TypeVarTuple).
// Do [annotation_value] = [*Ts].
// (Note that in theory we could end up here even for an argument
// other than *args, but in practice the grammar doesn't allow it.)
VISIT(c, expr, annotation->v.Starred.value);
ADDOP_I(c, loc, UNPACK_SEQUENCE, (Py_ssize_t) 1);
}
else {
VISIT(c, expr, annotation);
}
}
*annotations_len += 1;
return SUCCESS;
}
static int
codegen_argannotations(compiler *c, asdl_arg_seq* args,
Py_ssize_t *annotations_len, location loc)
{
int i;
for (i = 0; i < asdl_seq_LEN(args); i++) {
arg_ty arg = (arg_ty)asdl_seq_GET(args, i);
RETURN_IF_ERROR(
codegen_argannotation(
c,
arg->arg,
arg->annotation,
annotations_len,
loc));
}