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bpo-40222: "Zero cost" exception handling (GH-25729)

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"Zero cost" exception handling.

* Uses a lookup table to determine how to handle exceptions.
* Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements.
* Reduces the size of the frame object by about 60%.
This commit is contained in:
Mark Shannon 2021-05-07 15:19:19 +01:00 • committed by GitHub
parent b32c8e9795
commit adcd220556
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GPG key ID: 4AEE18F83AFDEB23
30 changed files with 6614 additions and 5687 deletions
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25
Include/opcode.h generated
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@ -35,10 +35,13 @@ extern "C" {
#define MATCH_SEQUENCE 32
#define MATCH_KEYS 33
#define COPY_DICT_WITHOUT_KEYS 34
#define PUSH_EXC_INFO 35
#define POP_EXCEPT_AND_RERAISE 37
#define WITH_EXCEPT_START 49
#define GET_AITER 50
#define GET_ANEXT 51
#define BEFORE_ASYNC_WITH 52
#define BEFORE_WITH 53
#define END_ASYNC_FOR 54
#define INPLACE_ADD 55
#define INPLACE_SUBTRACT 56
@ -69,7 +72,6 @@ extern "C" {
#define IMPORT_STAR 84
#define SETUP_ANNOTATIONS 85
#define YIELD_VALUE 86
#define POP_BLOCK 87
#define POP_EXCEPT 89
#define HAVE_ARGUMENT 90
#define STORE_NAME 90
@ -103,7 +105,6 @@ extern "C" {
#define CONTAINS_OP 118
#define RERAISE 119
#define JUMP_IF_NOT_EXC_MATCH 121
#define SETUP_FINALLY 122
#define LOAD_FAST 124
#define STORE_FAST 125
#define DELETE_FAST 126
@ -118,14 +119,12 @@ extern "C" {
#define DELETE_DEREF 138
#define CALL_FUNCTION_KW 141
#define CALL_FUNCTION_EX 142
#define SETUP_WITH 143
#define EXTENDED_ARG 144
#define LIST_APPEND 145
#define SET_ADD 146
#define MAP_ADD 147
#define LOAD_CLASSDEREF 148
#define MATCH_CLASS 152
#define SETUP_ASYNC_WITH 154
#define FORMAT_VALUE 155
#define BUILD_CONST_KEY_MAP 156
#define BUILD_STRING 157
@ -140,8 +139,8 @@ static uint32_t _PyOpcode_RelativeJump[8] = {
0U,
0U,
536870912U,
67125248U,
67141632U,
16384U,
0U,
0U,
0U,
0U,
@ -150,22 +149,20 @@ static uint32_t _PyOpcode_Jump[8] = {
0U,
0U,
536870912U,
101695488U,
67141632U,
34586624U,
0U,
0U,
0U,
0U,
};
#endif /* OPCODE_TABLES */
/* EXCEPT_HANDLER is a special, implicit block type which is created when
entering an except handler. It is not an opcode but we define it here
as we want it to be available to both frameobject.c and ceval.c, while
remaining private.*/
#define EXCEPT_HANDLER 257
#define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)
/* Reserve some bytecodes for internal use in the compiler.
* The value of 240 is arbitrary. */
#define IS_ARTIFICIAL(op) ((op) > 240)
#ifdef __cplusplus
}
#endif