From e5dde2c8327594b09b72c8590bc3e5be3a3c46fd Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 22 Mar 2021 11:02:54 +0100
Subject: [PATCH] Revert "bpo-40521: Make dtoa bigint free list per-interpreter
 (GH-24821)"

This reverts commit 5bd1059184b154d339f1bd53d23c98b5bcf14c8c.
---
 Include/internal/pycore_dtoa.h   | 16 --------------
 Include/internal/pycore_interp.h |  4 ----
 Python/dtoa.c                    | 36 +++++++++++++++-----------------
 3 files changed, 17 insertions(+), 39 deletions(-)

diff --git a/Include/internal/pycore_dtoa.h b/Include/internal/pycore_dtoa.h
index 0f61e751408586..3faf8cf6b2eefc 100644
--- a/Include/internal/pycore_dtoa.h
+++ b/Include/internal/pycore_dtoa.h
@@ -1,6 +1,4 @@
 #ifndef PY_NO_SHORT_FLOAT_REPR
-#ifndef Py_INTERNAL_DTOA_H
-#define Py_INTERNAL_DTOA_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -19,21 +17,7 @@ PyAPI_FUNC(void) _Py_dg_freedtoa(char *s);
 PyAPI_FUNC(double) _Py_dg_stdnan(int sign);
 PyAPI_FUNC(double) _Py_dg_infinity(int sign);
 
-#define _PyDtoa_Kmax 7
-
-typedef uint32_t _PyDtoa_ULong;
-typedef int32_t _PyDtoa_Long;
-typedef uint64_t _PyDtoa_ULLong;
-
-struct
-_PyDtoa_Bigint {
-    struct _PyDtoa_Bigint *next;
-    int k, maxwds, sign, wds;
-    _PyDtoa_ULong x[1];
-};
-
 #ifdef __cplusplus
 }
 #endif
-#endif /* !Py_INTERNAL_DTOA_H */
 #endif   /* !PY_NO_SHORT_FLOAT_REPR */
diff --git a/Include/internal/pycore_interp.h b/Include/internal/pycore_interp.h
index 1e4b3ff71eed49..fa0e26feb0f843 100644
--- a/Include/internal/pycore_interp.h
+++ b/Include/internal/pycore_interp.h
@@ -13,7 +13,6 @@ extern "C" {
 #include "pycore_gil.h"           // struct _gil_runtime_state
 #include "pycore_gc.h"            // struct _gc_runtime_state
 #include "pycore_warnings.h"      // struct _warnings_runtime_state
-#include "pycore_dtoa.h"
 
 struct _pending_calls {
     PyThread_type_lock lock;
@@ -322,9 +321,6 @@ struct _is {
 
     struct ast_state ast;
     struct type_cache type_cache;
-#ifndef PY_NO_SHORT_FLOAT_REPR
-    struct _PyDtoa_Bigint *dtoa_freelist[_PyDtoa_Kmax + 1];
-#endif
 };
 
 extern void _PyInterpreterState_ClearModules(PyInterpreterState *interp);
diff --git a/Python/dtoa.c b/Python/dtoa.c
index c7002e5d86d51b..e629b296426f31 100644
--- a/Python/dtoa.c
+++ b/Python/dtoa.c
@@ -119,16 +119,6 @@
 
 #include "Python.h"
 #include "pycore_dtoa.h"
-#include "pycore_interp.h"
-#include "pycore_pystate.h"
-
-#define ULong _PyDtoa_ULong
-#define Long _PyDtoa_Long
-#define ULLong _PyDtoa_ULLong
-#define Kmax _PyDtoa_Kmax
-
-typedef struct _PyDtoa_Bigint Bigint;
-
 
 /* if PY_NO_SHORT_FLOAT_REPR is defined, then don't even try to compile
    the following code */
@@ -164,6 +154,11 @@ typedef struct _PyDtoa_Bigint Bigint;
 #error "doubles and ints have incompatible endianness"
 #endif
 
+
+typedef uint32_t ULong;
+typedef int32_t Long;
+typedef uint64_t ULLong;
+
 #undef DEBUG
 #ifdef Py_DEBUG
 #define DEBUG
@@ -302,6 +297,8 @@ BCinfo {
 
 #define FFFFFFFF 0xffffffffUL
 
+#define Kmax 7
+
 /* struct Bigint is used to represent arbitrary-precision integers.  These
    integers are stored in sign-magnitude format, with the magnitude stored as
    an array of base 2**32 digits.  Bigints are always normalized: if x is a
@@ -324,6 +321,14 @@ BCinfo {
        significant (x[0]) to most significant (x[wds-1]).
 */
 
+struct
+Bigint {
+    struct Bigint *next;
+    int k, maxwds, sign, wds;
+    ULong x[1];
+};
+
+typedef struct Bigint Bigint;
 
 #ifndef Py_USING_MEMORY_DEBUGGER
 
@@ -346,13 +351,7 @@ BCinfo {
    Bfree to PyMem_Free.  Investigate whether this has any significant
    performance on impact. */
 
-
-/* Get Bigint freelist from interpreter  */
-static Bigint **
-get_freelist(void) {
-    PyInterpreterState *interp = _PyInterpreterState_GET();
-    return interp->dtoa_freelist;
-} 
+static Bigint *freelist[Kmax+1];
 
 /* Allocate space for a Bigint with up to 1<<k digits */
 
@@ -362,7 +361,7 @@ Balloc(int k)
     int x;
     Bigint *rv;
     unsigned int len;
-    Bigint **freelist = get_freelist();
+
     if (k <= Kmax && (rv = freelist[k]))
         freelist[k] = rv->next;
     else {
@@ -394,7 +393,6 @@ Bfree(Bigint *v)
         if (v->k > Kmax)
             FREE((void*)v);
         else {
-            Bigint **freelist = get_freelist();
             v->next = freelist[v->k];
             freelist[v->k] = v;
         }

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