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3982 lines (3591 loc) · 93.6 KB
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3982 lines (3591 loc) · 93.6 KB
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/*
* This file compiles an abstract syntax tree (AST) into Python bytecode.
*
* The primary entry point is PyAST_Compile(), which returns a
* PyCodeObject. The compiler makes several passes to build the code
* object:
* 1. Checks for future statements. See future.c
* 2. Builds a symbol table. See symtable.c.
* 3. Generate code for basic blocks. See compiler_mod() in this file.
* 4. Assemble the basic blocks into final code. See assemble() in
* this file.
* 5. Optimize the byte code (peephole optimizations). See peephole.c
*
* Note that compiler_mod() suggests module, but the module ast type
* (mod_ty) has cases for expressions and interactive statements.
*
* 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 "Python-ast.h"
#include "node.h"
#include "pyarena.h"
#include "ast.h"
#include "code.h"
#include "compile.h"
#include "symtable.h"
#include "opcode.h"
int Py_OptimizeFlag = 0;
#define DEFAULT_BLOCK_SIZE 16
#define DEFAULT_BLOCKS 8
#define DEFAULT_CODE_SIZE 128
#define DEFAULT_LNOTAB_SIZE 16
struct instr {
unsigned i_jabs : 1;
unsigned i_jrel : 1;
unsigned i_hasarg : 1;
unsigned char i_opcode;
int i_oparg;
struct basicblock_ *i_target; /* target block (if jump instruction) */
int i_lineno;
};
typedef struct basicblock_ {
/* Each basicblock in a compilation unit is linked via b_list in the
reverse order that the block are allocated. b_list points to the next
block, not to be confused with b_next, which is next by control flow. */
struct basicblock_ *b_list;
/* number of instructions used */
int b_iused;
/* length of instruction array (b_instr) */
int b_ialloc;
/* pointer to an array of instructions, initially NULL */
struct instr *b_instr;
/* If b_next is non-NULL, it is a pointer to the next
block reached by normal control flow. */
struct basicblock_ *b_next;
/* b_seen is used to perform a DFS of basicblocks. */
unsigned b_seen : 1;
/* b_return is true if a RETURN_VALUE opcode is inserted. */
unsigned b_return : 1;
/* depth of stack upon entry of block, computed by stackdepth() */
int b_startdepth;
/* instruction offset for block, computed by assemble_jump_offsets() */
int b_offset;
} basicblock;
/* fblockinfo tracks the current frame block.
A frame block is used to handle loops, try/except, and try/finally.
It's called a frame block to distinguish it from a basic block in the
compiler IR.
*/
enum fblocktype { LOOP, EXCEPT, FINALLY_TRY, FINALLY_END };
struct fblockinfo {
enum fblocktype fb_type;
basicblock *fb_block;
};
/* The following items change on entry and exit of code blocks.
They must be saved and restored when returning to a block.
*/
struct compiler_unit {
PySTEntryObject *u_ste;
PyObject *u_name;
/* The following fields are dicts that map objects to
the index of them in co_XXX. The index is used as
the argument for opcodes that refer to those collections.
*/
PyObject *u_consts; /* all constants */
PyObject *u_names; /* all names */
PyObject *u_varnames; /* local variables */
PyObject *u_cellvars; /* cell variables */
PyObject *u_freevars; /* free variables */
PyObject *u_private; /* for private name mangling */
int u_argcount; /* number of arguments for block */
/* Pointer to the most recently allocated block. By following b_list
members, you can reach all early allocated blocks. */
basicblock *u_blocks;
basicblock *u_curblock; /* pointer to current block */
int u_tmpname; /* temporary variables for list comps */
int u_nfblocks;
struct fblockinfo u_fblock[CO_MAXBLOCKS];
int u_firstlineno; /* the first lineno of the block */
int u_lineno; /* the lineno for the current stmt */
bool u_lineno_set; /* boolean to indicate whether instr
has been generated with current lineno */
};
/* This struct captures the global state of a compilation.
The u pointer points to the current compilation unit, while units
for enclosing blocks are stored in c_stack. The u and c_stack are
managed by compiler_enter_scope() and compiler_exit_scope().
*/
struct compiler {
const char *c_filename;
struct symtable *c_st;
PyFutureFeatures *c_future; /* pointer to module's __future__ */
PyCompilerFlags *c_flags;
int c_interactive; /* true if in interactive mode */
int c_nestlevel;
struct compiler_unit *u; /* compiler state for current block */
PyObject *c_stack; /* Python list holding compiler_unit ptrs */
char *c_encoding; /* source encoding (a borrowed reference) */
PyArena *c_arena; /* pointer to memory allocation arena */
};
static int compiler_enter_scope(struct compiler *, identifier, void *, int);
static void compiler_free(struct compiler *);
static basicblock *compiler_new_block(struct compiler *);
static int compiler_next_instr(struct compiler *, basicblock *);
static int compiler_addop(struct compiler *, int);
static int compiler_addop_o(struct compiler *, int, PyObject *, PyObject *);
static int compiler_addop_i(struct compiler *, int, int);
static int compiler_addop_j(struct compiler *, int, basicblock *, int);
static basicblock *compiler_use_new_block(struct compiler *);
static int compiler_error(struct compiler *, const char *);
static int compiler_nameop(struct compiler *, identifier, expr_context_ty);
static PyCodeObject *compiler_mod(struct compiler *, mod_ty);
static int compiler_visit_stmt(struct compiler *, stmt_ty);
static int compiler_visit_keyword(struct compiler *, keyword_ty);
static int compiler_visit_expr(struct compiler *, expr_ty);
static int compiler_augassign(struct compiler *, stmt_ty);
static int compiler_visit_slice(struct compiler *, slice_ty,
expr_context_ty);
static int compiler_push_fblock(struct compiler *, enum fblocktype,
basicblock *);
static void compiler_pop_fblock(struct compiler *, enum fblocktype,
basicblock *);
/* Returns true if there is a loop on the fblock stack. */
static int compiler_in_loop(struct compiler *);
static int inplace_binop(struct compiler *, operator_ty);
static int expr_constant(expr_ty e);
static int compiler_with(struct compiler *, stmt_ty);
static PyCodeObject *assemble(struct compiler *, int addNone);
static PyObject *__doc__;
PyObject *
_Py_Mangle(PyObject *privateobj, PyObject *ident)
{
/* Name mangling: __private becomes _classname__private.
This is independent from how the name is used. */
const char *p, *name = PyString_AsString(ident);
char *buffer;
size_t nlen, plen;
if (privateobj == NULL || !PyString_Check(privateobj) ||
name == NULL || name[0] != '_' || name[1] != '_') {
Py_INCREF(ident);
return ident;
}
p = PyString_AsString(privateobj);
nlen = strlen(name);
/* Don't mangle __id__ or names with dots.
The only time a name with a dot can occur is when
we are compiling an import statement that has a
package name.
TODO(jhylton): Decide whether we want to support
mangling of the module name, e.g. __M.X.
*/
if ((name[nlen-1] == '_' && name[nlen-2] == '_')
|| strchr(name, '.')) {
Py_INCREF(ident);
return ident; /* Don't mangle __whatever__ */
}
/* Strip leading underscores from class name */
while (*p == '_')
p++;
if (*p == '\0') {
Py_INCREF(ident);
return ident; /* Don't mangle if class is just underscores */
}
plen = strlen(p);
assert(1 <= PY_SSIZE_T_MAX - nlen);
assert(1 + nlen <= PY_SSIZE_T_MAX - plen);
ident = PyString_FromStringAndSize(NULL, 1 + nlen + plen);
if (!ident)
return 0;
/* ident = "_" + p[:plen] + name # i.e. 1+plen+nlen bytes */
buffer = PyString_AS_STRING(ident);
buffer[0] = '_';
strncpy(buffer+1, p, plen);
strcpy(buffer+1+plen, name);
return ident;
}
static int
compiler_init(struct compiler *c)
{
memset(c, 0, sizeof(struct compiler));
c->c_stack = PyList_New(0);
if (!c->c_stack)
return 0;
return 1;
}
PyCodeObject *
PyAST_Compile(mod_ty mod, const char *filename, PyCompilerFlags *flags,
PyArena *arena)
{
struct compiler c;
PyCodeObject *co = NULL;
PyCompilerFlags local_flags;
int merged;
if (!__doc__) {
__doc__ = PyString_InternFromString("__doc__");
if (!__doc__)
return NULL;
}
if (!compiler_init(&c))
return NULL;
c.c_filename = filename;
c.c_arena = arena;
c.c_future = PyFuture_FromAST(mod, filename);
if (c.c_future == NULL)
goto finally;
if (!flags) {
local_flags.cf_flags = 0;
flags = &local_flags;
}
merged = c.c_future->ff_features | flags->cf_flags;
c.c_future->ff_features = merged;
flags->cf_flags = merged;
c.c_flags = flags;
c.c_nestlevel = 0;
c.c_st = PySymtable_Build(mod, filename, c.c_future);
if (c.c_st == NULL) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_SystemError, "no symtable");
goto finally;
}
/* XXX initialize to NULL for now, need to handle */
c.c_encoding = NULL;
co = compiler_mod(&c, mod);
finally:
compiler_free(&c);
assert(co || PyErr_Occurred());
return co;
}
PyCodeObject *
PyNode_Compile(struct _node *n, const char *filename)
{
PyCodeObject *co = NULL;
mod_ty mod;
PyArena *arena = PyArena_New();
if (!arena)
return NULL;
mod = PyAST_FromNode(n, NULL, filename, arena);
if (mod)
co = PyAST_Compile(mod, filename, NULL, arena);
PyArena_Free(arena);
return co;
}
static void
compiler_free(struct compiler *c)
{
if (c->c_st)
PySymtable_Free(c->c_st);
if (c->c_future)
PyObject_Free(c->c_future);
Py_DECREF(c->c_stack);
}
static PyObject *
list2dict(PyObject *list)
{
Py_ssize_t i, n;
PyObject *v, *k;
PyObject *dict = PyDict_New();
if (!dict) return NULL;
n = PyList_Size(list);
for (i = 0; i < n; i++) {
v = PyInt_FromLong(i);
if (!v) {
Py_DECREF(dict);
return NULL;
}
k = PyList_GET_ITEM(list, i);
k = PyTuple_Pack(2, k, k->ob_type);
if (k == NULL || PyDict_SetItem(dict, k, v) < 0) {
Py_XDECREF(k);
Py_DECREF(v);
Py_DECREF(dict);
return NULL;
}
Py_DECREF(k);
Py_DECREF(v);
}
return dict;
}
/* Return new dict containing names from src that match scope(s).
src is a symbol table dictionary. If the scope of a name matches
either scope_type or flag is set, insert it into the new dict. The
values are integers, starting at offset and increasing by one for
each key.
*/
static PyObject *
dictbytype(PyObject *src, int scope_type, int flag, int offset)
{
Py_ssize_t pos = 0, i = offset, scope;
PyObject *k, *v, *dest = PyDict_New();
assert(offset >= 0);
if (dest == NULL)
return NULL;
while (PyDict_Next(src, &pos, &k, &v)) {
/* XXX this should probably be a macro in symtable.h */
assert(PyInt_Check(v));
scope = (PyInt_AS_LONG(v) >> SCOPE_OFF) & SCOPE_MASK;
if (scope == scope_type || PyInt_AS_LONG(v) & flag) {
PyObject *tuple, *item = PyInt_FromLong(i);
if (item == NULL) {
Py_DECREF(dest);
return NULL;
}
i++;
tuple = PyTuple_Pack(2, k, k->ob_type);
if (!tuple || PyDict_SetItem(dest, tuple, item) < 0) {
Py_DECREF(item);
Py_DECREF(dest);
Py_XDECREF(tuple);
return NULL;
}
Py_DECREF(item);
Py_DECREF(tuple);
}
}
return dest;
}
static void
compiler_unit_check(struct compiler_unit *u)
{
basicblock *block;
for (block = u->u_blocks; block != NULL; block = block->b_list) {
assert((void *)block != (void *)0xcbcbcbcb);
assert((void *)block != (void *)0xfbfbfbfb);
assert((void *)block != (void *)0xdbdbdbdb);
if (block->b_instr != NULL) {
assert(block->b_ialloc > 0);
assert(block->b_iused > 0);
assert(block->b_ialloc >= block->b_iused);
}
else {
assert (block->b_iused == 0);
assert (block->b_ialloc == 0);
}
}
}
static void
compiler_unit_free(struct compiler_unit *u)
{
basicblock *b, *next;
compiler_unit_check(u);
b = u->u_blocks;
while (b != NULL) {
if (b->b_instr)
PyObject_Free((void *)b->b_instr);
next = b->b_list;
PyObject_Free((void *)b);
b = next;
}
Py_CLEAR(u->u_ste);
Py_CLEAR(u->u_name);
Py_CLEAR(u->u_consts);
Py_CLEAR(u->u_names);
Py_CLEAR(u->u_varnames);
Py_CLEAR(u->u_freevars);
Py_CLEAR(u->u_cellvars);
Py_CLEAR(u->u_private);
PyObject_Free(u);
}
static int
compiler_enter_scope(struct compiler *c, identifier name, void *key,
int lineno)
{
struct compiler_unit *u;
u = (struct compiler_unit *)PyObject_Malloc(sizeof(
struct compiler_unit));
if (!u) {
PyErr_NoMemory();
return 0;
}
memset(u, 0, sizeof(struct compiler_unit));
u->u_argcount = 0;
u->u_ste = PySymtable_Lookup(c->c_st, key);
if (!u->u_ste) {
compiler_unit_free(u);
return 0;
}
Py_INCREF(name);
u->u_name = name;
u->u_varnames = list2dict(u->u_ste->ste_varnames);
u->u_cellvars = dictbytype(u->u_ste->ste_symbols, CELL, 0, 0);
if (!u->u_varnames || !u->u_cellvars) {
compiler_unit_free(u);
return 0;
}
u->u_freevars = dictbytype(u->u_ste->ste_symbols, FREE, DEF_FREE_CLASS,
PyDict_Size(u->u_cellvars));
if (!u->u_freevars) {
compiler_unit_free(u);
return 0;
}
u->u_blocks = NULL;
u->u_tmpname = 0;
u->u_nfblocks = 0;
u->u_firstlineno = lineno;
u->u_lineno = 0;
u->u_lineno_set = false;
u->u_consts = PyDict_New();
if (!u->u_consts) {
compiler_unit_free(u);
return 0;
}
u->u_names = PyDict_New();
if (!u->u_names) {
compiler_unit_free(u);
return 0;
}
u->u_private = NULL;
/* Push the old compiler_unit on the stack. */
if (c->u) {
PyObject *wrapper = PyCObject_FromVoidPtr(c->u, NULL);
if (!wrapper || PyList_Append(c->c_stack, wrapper) < 0) {
Py_XDECREF(wrapper);
compiler_unit_free(u);
return 0;
}
Py_DECREF(wrapper);
u->u_private = c->u->u_private;
Py_XINCREF(u->u_private);
}
c->u = u;
c->c_nestlevel++;
if (compiler_use_new_block(c) == NULL)
return 0;
return 1;
}
static void
compiler_exit_scope(struct compiler *c)
{
int n;
PyObject *wrapper;
c->c_nestlevel--;
compiler_unit_free(c->u);
/* Restore c->u to the parent unit. */
n = PyList_GET_SIZE(c->c_stack) - 1;
if (n >= 0) {
wrapper = PyList_GET_ITEM(c->c_stack, n);
c->u = (struct compiler_unit *)PyCObject_AsVoidPtr(wrapper);
assert(c->u);
/* we are deleting from a list so this really shouldn't fail */
if (PySequence_DelItem(c->c_stack, n) < 0)
Py_FatalError("compiler_exit_scope()");
compiler_unit_check(c->u);
}
else
c->u = NULL;
}
/* Allocate a new "anonymous" local variable.
Used by list comprehensions and with statements.
*/
static PyObject *
compiler_new_tmpname(struct compiler *c)
{
char tmpname[256];
PyOS_snprintf(tmpname, sizeof(tmpname), "_[%d]", ++c->u->u_tmpname);
return PyString_FromString(tmpname);
}
/* Allocate a new block and return a pointer to it.
Returns NULL on error.
*/
static basicblock *
compiler_new_block(struct compiler *c)
{
basicblock *b;
struct compiler_unit *u;
u = c->u;
b = (basicblock *)PyObject_Malloc(sizeof(basicblock));
if (b == NULL) {
PyErr_NoMemory();
return NULL;
}
memset((void *)b, 0, sizeof(basicblock));
/* Extend the singly linked list of blocks with new block. */
b->b_list = u->u_blocks;
u->u_blocks = b;
return b;
}
static basicblock *
compiler_use_new_block(struct compiler *c)
{
basicblock *block = compiler_new_block(c);
if (block == NULL)
return NULL;
c->u->u_curblock = block;
return block;
}
static basicblock *
compiler_next_block(struct compiler *c)
{
basicblock *block = compiler_new_block(c);
if (block == NULL)
return NULL;
c->u->u_curblock->b_next = block;
c->u->u_curblock = block;
return block;
}
static basicblock *
compiler_use_next_block(struct compiler *c, basicblock *block)
{
assert(block != NULL);
c->u->u_curblock->b_next = block;
c->u->u_curblock = block;
return block;
}
/* Returns the offset of the next instruction in the current block's
b_instr array. Resizes the b_instr as necessary.
Returns -1 on failure.
*/
static int
compiler_next_instr(struct compiler *c, basicblock *b)
{
assert(b != NULL);
if (b->b_instr == NULL) {
b->b_instr = (struct instr *)PyObject_Malloc(
sizeof(struct instr) * DEFAULT_BLOCK_SIZE);
if (b->b_instr == NULL) {
PyErr_NoMemory();
return -1;
}
b->b_ialloc = DEFAULT_BLOCK_SIZE;
memset((char *)b->b_instr, 0,
sizeof(struct instr) * DEFAULT_BLOCK_SIZE);
}
else if (b->b_iused == b->b_ialloc) {
struct instr *tmp;
size_t oldsize, newsize;
oldsize = b->b_ialloc * sizeof(struct instr);
newsize = oldsize << 1;
if (oldsize > (PY_SIZE_MAX >> 1)) {
PyErr_NoMemory();
return -1;
}
if (newsize == 0) {
PyErr_NoMemory();
return -1;
}
b->b_ialloc <<= 1;
tmp = (struct instr *)PyObject_Realloc(
(void *)b->b_instr, newsize);
if (tmp == NULL) {
PyErr_NoMemory();
return -1;
}
b->b_instr = tmp;
memset((char *)b->b_instr + oldsize, 0, newsize - oldsize);
}
return b->b_iused++;
}
/* Set the i_lineno member of the instruction at offset off if the
line number for the current expression/statement has not
already been set. If it has been set, the call has no effect.
The line number is reset in the following cases:
- when entering a new scope
- on each statement
- on each expression that start a new line
- before the "except" clause
- before the "for" and "while" expressions
*/
static void
compiler_set_lineno(struct compiler *c, int off)
{
basicblock *b;
if (c->u->u_lineno_set)
return;
c->u->u_lineno_set = true;
b = c->u->u_curblock;
b->b_instr[off].i_lineno = c->u->u_lineno;
}
static int
opcode_stack_effect(int opcode, int oparg)
{
switch (opcode) {
case POP_TOP:
return -1;
case ROT_TWO:
case ROT_THREE:
return 0;
case DUP_TOP:
return 1;
case ROT_FOUR:
return 0;
case UNARY_POSITIVE:
case UNARY_NEGATIVE:
case UNARY_NOT:
case UNARY_CONVERT:
case UNARY_INVERT:
return 0;
case LIST_APPEND:
return -1;
case BINARY_POWER:
case BINARY_MULTIPLY:
case BINARY_DIVIDE:
case BINARY_MODULO:
case BINARY_ADD:
case BINARY_SUBTRACT:
case BINARY_SUBSCR:
case BINARY_FLOOR_DIVIDE:
case BINARY_TRUE_DIVIDE:
return -1;
case INPLACE_FLOOR_DIVIDE:
case INPLACE_TRUE_DIVIDE:
return -1;
case SLICE+0:
return 1;
case SLICE+1:
return 0;
case SLICE+2:
return 0;
case SLICE+3:
return -1;
case STORE_SLICE+0:
return -2;
case STORE_SLICE+1:
return -3;
case STORE_SLICE+2:
return -3;
case STORE_SLICE+3:
return -4;
case DELETE_SLICE+0:
return -1;
case DELETE_SLICE+1:
return -2;
case DELETE_SLICE+2:
return -2;
case DELETE_SLICE+3:
return -3;
case INPLACE_ADD:
case INPLACE_SUBTRACT:
case INPLACE_MULTIPLY:
case INPLACE_DIVIDE:
case INPLACE_MODULO:
return -1;
case STORE_SUBSCR:
return -3;
case STORE_MAP:
return -2;
case DELETE_SUBSCR:
return -2;
case BINARY_LSHIFT:
case BINARY_RSHIFT:
case BINARY_AND:
case BINARY_XOR:
case BINARY_OR:
return -1;
case INPLACE_POWER:
return -1;
case GET_ITER:
return 0;
case PRINT_EXPR:
return -1;
case PRINT_ITEM:
return -1;
case PRINT_NEWLINE:
return 0;
case PRINT_ITEM_TO:
return -2;
case PRINT_NEWLINE_TO:
return -1;
case INPLACE_LSHIFT:
case INPLACE_RSHIFT:
case INPLACE_AND:
case INPLACE_XOR:
case INPLACE_OR:
return -1;
case BREAK_LOOP:
return 0;
case WITH_CLEANUP:
return -1; /* XXX Sometimes more */
case LOAD_LOCALS:
return 1;
case RETURN_VALUE:
return -1;
case IMPORT_STAR:
return -1;
case EXEC_STMT:
return -3;
case YIELD_VALUE:
return 0;
case POP_BLOCK:
return 0;
case END_FINALLY:
return -1; /* or -2 or -3 if exception occurred */
case BUILD_CLASS:
return -2;
case STORE_NAME:
return -1;
case DELETE_NAME:
return 0;
case UNPACK_SEQUENCE:
return oparg-1;
case FOR_ITER:
return 1;
case STORE_ATTR:
return -2;
case DELETE_ATTR:
return -1;
case STORE_GLOBAL:
return -1;
case DELETE_GLOBAL:
return 0;
case DUP_TOPX:
return oparg;
case LOAD_CONST:
return 1;
case LOAD_NAME:
return 1;
case BUILD_TUPLE:
case BUILD_LIST:
return 1-oparg;
case BUILD_MAP:
return 1;
case LOAD_ATTR:
return 0;
case COMPARE_OP:
return -1;
case IMPORT_NAME:
return 0;
case IMPORT_FROM:
return 1;
case JUMP_FORWARD:
case JUMP_IF_FALSE:
case JUMP_IF_TRUE:
case JUMP_ABSOLUTE:
return 0;
case LOAD_GLOBAL:
return 1;
case CONTINUE_LOOP:
return 0;
case SETUP_LOOP:
return 0;
case SETUP_EXCEPT:
case SETUP_FINALLY:
return 3; /* actually pushed by an exception */
case LOAD_FAST:
return 1;
case STORE_FAST:
return -1;
case DELETE_FAST:
return 0;
case RAISE_VARARGS:
return -oparg;
#define NARGS(o) (((o) % 256) + 2*((o) / 256))
case CALL_FUNCTION:
return -NARGS(oparg);
case CALL_FUNCTION_VAR:
case CALL_FUNCTION_KW:
return -NARGS(oparg)-1;
case CALL_FUNCTION_VAR_KW:
return -NARGS(oparg)-2;
#undef NARGS
case MAKE_FUNCTION:
return -oparg;
case BUILD_SLICE:
if (oparg == 3)
return -2;
else
return -1;
case MAKE_CLOSURE:
return -oparg;
case LOAD_CLOSURE:
return 1;
case LOAD_DEREF:
return 1;
case STORE_DEREF:
return -1;
default:
fprintf(stderr, "opcode = %d\n", opcode);
Py_FatalError("opcode_stack_effect()");
}
return 0; /* not reachable */
}
/* Add an opcode with no argument.
Returns 0 on failure, 1 on success.
*/
static int
compiler_addop(struct compiler *c, int opcode)
{
basicblock *b;
struct instr *i;
int off;
off = compiler_next_instr(c, c->u->u_curblock);
if (off < 0)
return 0;
b = c->u->u_curblock;
i = &b->b_instr[off];
i->i_opcode = opcode;
i->i_hasarg = 0;
if (opcode == RETURN_VALUE)
b->b_return = 1;
compiler_set_lineno(c, off);
return 1;
}
static int
compiler_add_o(struct compiler *c, PyObject *dict, PyObject *o)
{
PyObject *t, *v;
Py_ssize_t arg;
unsigned char *p, *q;
Py_complex z;
double d;
int real_part_zero, imag_part_zero;
/* necessary to make sure types aren't coerced (e.g., int and long) */
/* _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms */
if (PyFloat_Check(o)) {
d = PyFloat_AS_DOUBLE(o);
p = (unsigned char*) &d;
/* all we need is to make the tuple different in either the 0.0
* or -0.0 case from all others, just to avoid the "coercion".
*/
if (*p==0 && p[sizeof(double)-1]==0)
t = PyTuple_Pack(3, o, o->ob_type, Py_None);
else
t = PyTuple_Pack(2, o, o->ob_type);
}
else if (PyComplex_Check(o)) {
/* complex case is even messier: we need to make complex(x,
0.) different from complex(x, -0.) and complex(0., y)
different from complex(-0., y), for any x and y. In
particular, all four complex zeros should be
distinguished.*/
z = PyComplex_AsCComplex(o);
p = (unsigned char*) &(z.real);
q = (unsigned char*) &(z.imag);
/* all that matters here is that on IEEE platforms
real_part_zero will be true if z.real == 0., and false if
z.real == -0. In fact, real_part_zero will also be true
for some other rarely occurring nonzero floats, but this
doesn't matter. Similar comments apply to
imag_part_zero. */
real_part_zero = *p==0 && p[sizeof(double)-1]==0;
imag_part_zero = *q==0 && q[sizeof(double)-1]==0;
if (real_part_zero && imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_True, Py_True);
}
else if (real_part_zero && !imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_True, Py_False);
}
else if (!real_part_zero && imag_part_zero) {
t = PyTuple_Pack(4, o, o->ob_type, Py_False, Py_True);
}
else {
t = PyTuple_Pack(2, o, o->ob_type);
}
}
else {
t = PyTuple_Pack(2, o, o->ob_type);
}
if (t == NULL)
return -1;
v = PyDict_GetItem(dict, t);
if (!v) {
arg = PyDict_Size(dict);
v = PyInt_FromLong(arg);
if (!v) {
Py_DECREF(t);
return -1;
}
if (PyDict_SetItem(dict, t, v) < 0) {
Py_DECREF(t);
Py_DECREF(v);
return -1;
}
Py_DECREF(v);
}
else
arg = PyInt_AsLong(v);
Py_DECREF(t);
return arg;
}
static int
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