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Update VM stacks comments.

This commit is contained in:
Paul Sokolovsky 2014-01-31 19:45:15 +02:00
parent c7a0b14df9
commit 8519342c1a
1 changed files with 7 additions and 3 deletions
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10
py/vm.c
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@ -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)