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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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9
Lib/opcode.py
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@ -86,11 +86,15 @@ def_op('MATCH_MAPPING', 31)
def_op('MATCH_SEQUENCE', 32)
def_op('MATCH_KEYS', 33)
def_op('COPY_DICT_WITHOUT_KEYS', 34)
def_op('PUSH_EXC_INFO', 35)
def_op('POP_EXCEPT_AND_RERAISE', 37)
def_op('WITH_EXCEPT_START', 49)
def_op('GET_AITER', 50)
def_op('GET_ANEXT', 51)
def_op('BEFORE_ASYNC_WITH', 52)
def_op('BEFORE_WITH', 53)
def_op('END_ASYNC_FOR', 54)
def_op('INPLACE_ADD', 55)
@ -124,7 +128,6 @@ def_op('RETURN_VALUE', 83)
def_op('IMPORT_STAR', 84)
def_op('SETUP_ANNOTATIONS', 85)
def_op('YIELD_VALUE', 86)
def_op('POP_BLOCK', 87)
def_op('POP_EXCEPT', 89)
@ -164,7 +167,6 @@ def_op('CONTAINS_OP', 118)
def_op('RERAISE', 119)
jabs_op('JUMP_IF_NOT_EXC_MATCH', 121)
jrel_op('SETUP_FINALLY', 122) # Distance to target address
def_op('LOAD_FAST', 124) # Local variable number
haslocal.append(124)
@ -190,7 +192,7 @@ hasfree.append(138)
def_op('CALL_FUNCTION_KW', 141) # #args + #kwargs
def_op('CALL_FUNCTION_EX', 142) # Flags
jrel_op('SETUP_WITH', 143)
def_op('EXTENDED_ARG', 144)
EXTENDED_ARG = 144
def_op('LIST_APPEND', 145)
@ -201,7 +203,6 @@ hasfree.append(148)
def_op('MATCH_CLASS', 152)
jrel_op('SETUP_ASYNC_WITH', 154)
def_op('FORMAT_VALUE', 155)
def_op('BUILD_CONST_KEY_MAP', 156)
def_op('BUILD_STRING', 157)