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https://github.com/lua/lua
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f407b3c4a1
The callstatus flag CIST_CLSRET is used in all tests for the presence of variables to be closed in C functions.
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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** $Id: lapi.h $
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** Auxiliary functions from Lua API
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** See Copyright Notice in lua.h
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*/
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#ifndef lapi_h
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#define lapi_h
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#include "llimits.h"
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#include "lstate.h"
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#if defined(LUA_USE_APICHECK)
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#include <assert.h>
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#define api_check(l,e,msg) assert(e)
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#else /* for testing */
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#define api_check(l,e,msg) ((void)(l), lua_assert((e) && msg))
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#endif
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/* Increments 'L->top.p', checking for stack overflows */
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#define api_incr_top(L) \
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(L->top.p++, api_check(L, L->top.p <= L->ci->top.p, "stack overflow"))
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/*
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** macros that are executed whenever program enters the Lua core
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** ('lua_lock') and leaves the core ('lua_unlock')
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*/
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#if !defined(lua_lock)
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#define lua_lock(L) ((void) 0)
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#define lua_unlock(L) ((void) 0)
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#endif
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/*
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** If a call returns too many multiple returns, the callee may not have
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** stack space to accommodate all results. In this case, this macro
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** increases its stack space ('L->ci->top.p').
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*/
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#define adjustresults(L,nres) \
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{ if ((nres) <= LUA_MULTRET && L->ci->top.p < L->top.p) \
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L->ci->top.p = L->top.p; }
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/* Ensure the stack has at least 'n' elements */
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#define api_checknelems(L,n) \
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api_check(L, (n) < (L->top.p - L->ci->func.p), \
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"not enough elements in the stack")
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/* Ensure the stack has at least 'n' elements to be popped. (Some
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** functions only update a slot after checking it for popping, but that
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** is only an optimization for a pop followed by a push.)
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*/
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#define api_checkpop(L,n) \
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api_check(L, (n) < L->top.p - L->ci->func.p && \
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L->tbclist.p < L->top.p - (n), \
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"not enough free elements in the stack")
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#endif
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