cpython/Python/codegen.c at main · ZeroIntensity/cpython · GitHub

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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_Module() 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 "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_c_array.h" // _Py_c_array_t

#include "pycore_code.h" // COMPARISON_LESS_THAN

#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

#include "pycore_unicodeobject.h" // _PyUnicode_EqualToASCIIString

#include "pycore_ceval.h" // SPECIAL___ENTER__

#include "pycore_template.h" // _PyTemplate_Type

#define NEED_OPCODE_METADATA

#include "pycore_opcode_metadata.h" // _PyOpcode_opcode_metadata, _PyOpcode_num_popped/pushed

#undef NEED_OPCODE_METADATA

#include <stdbool.h>

#define COMP_GENEXP 0

#define COMP_LISTCOMP 1

#define COMP_SETCOMP 2

#define COMP_DICTCOMP 3

#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,

};

int

_Py_CArray_Init(_Py_c_array_t* array, int item_size, int initial_num_entries) {

memset(array, 0, sizeof(_Py_c_array_t));

array->item_size = item_size;

array->initial_num_entries = initial_num_entries;

return 0;

}

void

_Py_CArray_Fini(_Py_c_array_t* array)

{

if (array->array) {

PyMem_Free(array->array);

array->allocated_entries = 0;

}

int

_Py_CArray_EnsureCapacity(_Py_c_array_t *c_array, int idx)

{

void *arr = c_array->array;

int alloc = c_array->allocated_entries;

if (arr == NULL) {

int new_alloc = c_array->initial_num_entries;

if (idx >= new_alloc) {

new_alloc = idx + c_array->initial_num_entries;

}

arr = PyMem_Calloc(new_alloc, c_array->item_size);

if (arr == NULL) {

PyErr_NoMemory();

return ERROR;

}

alloc = new_alloc;

}

else if (idx >= alloc) {

size_t oldsize = alloc * c_array->item_size;

int new_alloc = alloc << 1;

if (idx >= new_alloc) {

new_alloc = idx + c_array->initial_num_entries;

}

size_t newsize = new_alloc * c_array->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);

}

c_array->array = arr;

c_array->allocated_entries = alloc;

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_body(compiler *, location, asdl_stmt_seq *, bool);

static int codegen_with(compiler *, stmt_ty);

static int codegen_async_with(compiler *, stmt_ty);

static int codegen_with_inner(compiler *, stmt_ty, int);

static int codegen_async_with_inner(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);

typedef enum {

ITERABLE_IN_LOCAL = 0,

ITERABLE_ON_STACK = 1,

ITERATOR_ON_STACK = 2,

} IterStackPosition;

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,

IterStackPosition iter_pos);

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,

IterStackPosition iter_pos);

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)

{

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_custom(compiler *c, location loc, int opcode,

PyObject *dict, PyObject *o, int shift, int low)

{

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;

}

ADDOP_I(c, loc, opcode, (arg << shift) | low);

return SUCCESS;

}

static int

codegen_addop_name(compiler *c, location loc,

int opcode, PyObject *dict, PyObject *o)

{

int shift = 0, low = 0;

if (opcode == LOAD_ATTR) {

shift = 1;

}

if (opcode == LOAD_METHOD) {

opcode = LOAD_ATTR;

shift = 1;

low = 1;

}

if (opcode == LOAD_SUPER_ATTR) {

shift = 2;

low = 2;

}

if (opcode == LOAD_SUPER_METHOD) {

opcode = LOAD_SUPER_ATTR;

shift = 2;

low = 3;

}

if (opcode == LOAD_ZERO_SUPER_ATTR) {

opcode = LOAD_SUPER_ATTR;

shift = 2;

}

if (opcode == LOAD_ZERO_SUPER_METHOD) {

opcode = LOAD_SUPER_ATTR;

shift = 2;

low = 1;

}

return codegen_addop_name_custom(c, loc, opcode, dict, o, shift, low);

}

#define ADDOP_NAME(C, LOC, OP, O, TYPE) \

RETURN_IF_ERROR(codegen_addop_name((C), (LOC), (OP), METADATA(C)->u_ ## TYPE, (O)))

#define ADDOP_NAME_CUSTOM(C, LOC, OP, O, TYPE, SHIFT, LOW) \

RETURN_IF_ERROR(codegen_addop_name_custom((C), (LOC), (OP), METADATA(C)->u_ ## TYPE, (O), SHIFT, LOW))

static int

codegen_addop_j(instr_sequence *seq, location loc,

int opcode, jump_target_label target)

{

assert(IS_JUMP_TARGET_LABEL(target));

assert(HAS_TARGET(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_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, 3);

}

ADDOP(c, *ploc, POP_TOP);

return SUCCESS;

case COMPILE_FBLOCK_ASYNC_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 ||

top->fb_type == COMPILE_FBLOCK_ASYNC_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, &copy, 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;

}

/* Add the generator prefix instructions. */

PySTEntryObject *ste = SYMTABLE_ENTRY(c);

if (ste->ste_coroutine || ste->ste_generator) {

/* Note that RETURN_GENERATOR + POP_TOP have a net stack effect

* of 0. This is because RETURN_GENERATOR pushes the generator

before returning. */

location loc = LOCATION(lineno, lineno, -1, -1);

ADDOP(c, loc, RETURN_GENERATOR);

ADDOP(c, loc, POP_TOP);

}

ADDOP_I(c, loc, RESUME, RESUME_AT_FUNC_START);

if (scope_type == COMPILE_SCOPE_MODULE) {

ADDOP(c, loc, ANNOTATIONS_PLACEHOLDER);

}

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)

{

ADDOP_IN_SCOPE(c, loc, RETURN_VALUE);

PyCodeObject *co = _PyCompile_OptimizeAndAssemble(c, 1);

if (co == NULL) {

return ERROR;

}

// 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) {

Py_DECREF(co);

return ERROR;

}

PyObject *new_names = PyTuple_New(size);

if (new_names == NULL) {

Py_DECREF(co);

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(co);

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);

int ret = codegen_make_closure(c, loc, co, 0);

Py_DECREF(co);

RETURN_IF_ERROR(ret);

return SUCCESS;

}

static int

codegen_deferred_annotations_body(compiler *c, location loc,

PyObject *deferred_anno, PyObject *conditional_annotation_indices, int scope_type)

{

Py_ssize_t annotations_len = PyList_GET_SIZE(deferred_anno);

assert(PyList_CheckExact(conditional_annotation_indices));

assert(annotations_len == PyList_Size(conditional_annotation_indices));

ADDOP_I(c, loc, BUILD_MAP, 0); // stack now contains <annos>

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) {

return ERROR;

}

PyObject *mangled = _PyCompile_Mangle(c, st->v.AnnAssign.target->v.Name.id);

if (!mangled) {

return ERROR;

}

PyObject *cond_index = PyList_GET_ITEM(conditional_annotation_indices, i);

assert(PyLong_CheckExact(cond_index));

long idx = PyLong_AS_LONG(cond_index);

NEW_JUMP_TARGET_LABEL(c, not_set);

if (idx != -1) {

ADDOP_LOAD_CONST(c, LOC(st), cond_index);

if (scope_type == COMPILE_SCOPE_CLASS) {

ADDOP_NAME(

c, LOC(st), LOAD_DEREF, &_Py_ID(__conditional_annotations__), freevars);

}

else {

ADDOP_NAME(

c, LOC(st), LOAD_GLOBAL, &_Py_ID(__conditional_annotations__), names);

}

ADDOP_I(c, LOC(st), CONTAINS_OP, 0);

ADDOP_JUMP(c, LOC(st), POP_JUMP_IF_FALSE, not_set);

}

VISIT(c, expr, st->v.AnnAssign.annotation);

ADDOP_I(c, LOC(st), COPY, 2);

ADDOP_LOAD_CONST_NEW(c, LOC(st), mangled);

// stack now contains <annos> <name> <annos> <value>

ADDOP(c, loc, STORE_SUBSCR);

// stack now contains <annos>

USE_LABEL(c, not_set);

}

return SUCCESS;

}

static int

codegen_process_deferred_annotations(compiler *c, location loc)

{

PyObject *deferred_anno = NULL;

PyObject *conditional_annotation_indices = NULL;

_PyCompile_DeferredAnnotations(c, &deferred_anno, &conditional_annotation_indices);

if (deferred_anno == NULL) {

assert(conditional_annotation_indices == NULL);

return SUCCESS;

}

int scope_type = SCOPE_TYPE(c);

bool need_separate_block = scope_type == COMPILE_SCOPE_MODULE;

if (need_separate_block) {

if (_PyCompile_StartAnnotationSetup(c) == ERROR) {

goto error;

}

// 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) {

goto error;

}

if (codegen_deferred_annotations_body(c, loc, deferred_anno,

conditional_annotation_indices, scope_type) < 0) {

_PyCompile_ExitScope(c);

goto error;

}

Py_DECREF(deferred_anno);

Py_DECREF(conditional_annotation_indices);

RETURN_IF_ERROR(codegen_leave_annotations_scope(c, loc));

RETURN_IF_ERROR(codegen_nameop(

c, loc,

ste->ste_type == ClassBlock ? &_Py_ID(__annotate_func__) : &_Py_ID(__annotate__),

Store));

if (need_separate_block) {

RETURN_IF_ERROR(_PyCompile_EndAnnotationSetup(c));

}

return SUCCESS;

error:

Py_XDECREF(deferred_anno);

Py_XDECREF(conditional_annotation_indices);

return ERROR;

}

/* 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_Module(compiler *c, location loc, asdl_stmt_seq *stmts, bool is_interactive)

{

if (SYMTABLE_ENTRY(c)->ste_has_conditional_annotations) {

ADDOP_I(c, loc, BUILD_SET, 0);

ADDOP_N(c, loc, STORE_NAME, &_Py_ID(__conditional_annotations__), names);

}

return codegen_body(c, loc, stmts, is_interactive);

}

int

codegen_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;

}

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