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py: Add mp_pending_exception global variable, for VM soft interrupt.

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This allows to implement KeyboardInterrupt on unix, and a much safer
ctrl-C in stmhal port.  First ctrl-C is a soft one, with hope that VM
will notice it; second ctrl-C is a hard one that kills anything (for
both unix and stmhal).

One needs to check for a pending exception in the VM only for jump
opcodes.  Others can't produce an infinite loop (infinite recursion is
caught by stack check).
This commit is contained in:
Damien George
2014-10-25 18:19:55 +01:00
parent d7353fe6fe
commit 124df6f8d0
10 changed files with 71 additions and 14 deletions
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23
py/vm.c
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@@ -110,10 +110,12 @@ mp_vm_return_kind_t mp_execute_bytecode(mp_code_state *code_state, volatile mp_o
code_state->ip = ip; \
goto *entry_table[*ip++]; \
} while(0)
#define DISPATCH_WITH_PEND_EXC_CHECK() goto pending_exception_check
#define ENTRY(op) entry_##op
#define ENTRY_DEFAULT entry_default
#else
#define DISPATCH() break
#define DISPATCH_WITH_PEND_EXC_CHECK() goto pending_exception_check
#define ENTRY(op) case op
#define ENTRY_DEFAULT default
#endif
@@ -372,21 +374,21 @@ dispatch_loop:
ENTRY(MP_BC_JUMP):
DECODE_SLABEL;
ip += unum;
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
ENTRY(MP_BC_POP_JUMP_IF_TRUE):
DECODE_SLABEL;
if (mp_obj_is_true(POP())) {
ip += unum;
}
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
ENTRY(MP_BC_POP_JUMP_IF_FALSE):
DECODE_SLABEL;
if (!mp_obj_is_true(POP())) {
ip += unum;
}
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
ENTRY(MP_BC_JUMP_IF_TRUE_OR_POP):
DECODE_SLABEL;
@@ -395,7 +397,7 @@ dispatch_loop:
} else {
sp--;
}
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
ENTRY(MP_BC_JUMP_IF_FALSE_OR_POP):
DECODE_SLABEL;
@@ -404,7 +406,7 @@ dispatch_loop:
} else {
ip += unum;
}
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
ENTRY(MP_BC_SETUP_WITH): {
mp_obj_t obj = TOP();
@@ -502,7 +504,7 @@ unwind_jump:
if (unum != 0) {
sp--;
}
DISPATCH();
DISPATCH_WITH_PEND_EXC_CHECK();
// matched against: POP_BLOCK or POP_EXCEPT (anything else?)
ENTRY(MP_BC_SETUP_EXCEPT):
@@ -909,6 +911,15 @@ yield:
#if !MICROPY_OPT_COMPUTED_GOTO
} // switch
#endif
pending_exception_check:
if (mp_pending_exception != MP_OBJ_NULL) {
mp_obj_t obj = mp_pending_exception;
mp_pending_exception = MP_OBJ_NULL;
RAISE(obj);
}
DISPATCH();
} // for loop
} else {