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Issue #21523: Fix over-pessimistic computation of the stack effect of some opcodes in the compiler.

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This also fixes a quadratic compilation time issue noticeable when compiling
code with a large number of "and" and "or" operators.
This commit is contained in:
Antoine Pitrou 2014-05-23 11:47:32 +02:00
commit 5c8008e59d
3 changed files with 50 additions and 5 deletions
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8
Python/compile.c
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@ -3862,12 +3862,16 @@ stackdepth_walk(struct compiler *c, basicblock *b, int depth, int maxdepth)
target_depth = depth;
if (instr->i_opcode == FOR_ITER) {
target_depth = depth-2;
} else if (instr->i_opcode == SETUP_FINALLY ||
instr->i_opcode == SETUP_EXCEPT) {
}
else if (instr->i_opcode == SETUP_FINALLY ||
instr->i_opcode == SETUP_EXCEPT) {
target_depth = depth+3;
if (target_depth > maxdepth)
maxdepth = target_depth;
}
else if (instr->i_opcode == JUMP_IF_TRUE_OR_POP ||
instr->i_opcode == JUMP_IF_FALSE_OR_POP)
depth = depth - 1;
maxdepth = stackdepth_walk(c, instr->i_target,
target_depth, maxdepth);
if (instr->i_opcode == JUMP_ABSOLUTE ||