diff options
| -rw-r--r-- | py/vm.c | 10 |
1 files changed, 7 insertions, 3 deletions
@@ -13,6 +13,13 @@ #include "bc0.h" #include "bc.h" +// Value stack grows up (this makes it incompatible with native C stack, but +// makes sure that arguments to functions are in natural order arg1..argN +// (Python semantics mandates left-to-right evaluation order, including for +// function arguments). Stack pointer is pre-incremented and points at the +// top element. +// Exception stack also grows up, top element is also pointed at. + // Exception stack entry typedef struct _mp_exc_stack { const byte *handler; @@ -23,9 +30,6 @@ typedef struct _mp_exc_stack { byte opcode; } mp_exc_stack; -// (value) stack grows down (to be compatible with native code when passing pointers to the stack), top element is pointed to -// exception stack grows up, top element is pointed to - #define DECODE_UINT do { unum = *ip++; if (unum > 127) { unum = ((unum & 0x3f) << 8) | (*ip++); } } while (0) #define DECODE_ULABEL do { unum = (ip[0] | (ip[1] << 8)); ip += 2; } while (0) #define DECODE_SLABEL do { unum = (ip[0] | (ip[1] << 8)) - 0x8000; ip += 2; } while (0) |