From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Alexander Turenko Subject: [PATCH v3 1/7] Add luaL_iscallable with support of cdata metatype Date: Wed, 10 Apr 2019 18:21:19 +0300 Message-Id: <14745d8b9807b56a85bb77217ff4be4d73340ad7.1554906327.git.alexander.turenko@tarantool.org> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: Vladimir Davydov Cc: Alexander Turenko , tarantool-patches@freelists.org List-ID: Needed for #3276. --- extra/exports | 1 + src/lua/utils.c | 43 ++++++++++++++++ src/lua/utils.h | 10 ++++ test/app-tap/module_api.c | 10 ++++ test/app-tap/module_api.test.lua | 85 +++++++++++++++++++++++++++++++- 5 files changed, 147 insertions(+), 2 deletions(-) diff --git a/extra/exports b/extra/exports index 21fa9bf00..4f41a17b3 100644 --- a/extra/exports +++ b/extra/exports @@ -136,6 +136,7 @@ luaT_call luaT_cpcall luaT_state luaT_tolstring +luaL_iscallable box_txn box_txn_begin box_txn_commit diff --git a/src/lua/utils.c b/src/lua/utils.c index a4fdf8985..83bc1695e 100644 --- a/src/lua/utils.c +++ b/src/lua/utils.c @@ -1016,6 +1016,49 @@ luaT_tolstring(lua_State *L, int idx, size_t *len) return lua_tolstring(L, -1, len); } +/* Based on ffi_meta___call() from luajit/src/lib_ffi.c. */ +static int +luaL_cdata_iscallable(lua_State *L, int idx) +{ + /* Calculate absolute value in the stack. */ + if (idx < 0) + idx = lua_gettop(L) + idx + 1; + + /* Get cdata from the stack. */ + assert(lua_type(L, idx) == LUA_TCDATA); + GCcdata *cd = cdataV(L->base + idx - 1); + + CTState *cts = ctype_cts(L); + CTypeID id = cd->ctypeid; + CType *ct = ctype_raw(cts, id); + if (ctype_isptr(ct->info)) + id = ctype_cid(ct->info); + + /* Get ctype metamethod. */ + cTValue *tv = lj_ctype_meta(cts, id, MM_call); + + return tv != NULL; +} + +int +luaL_iscallable(lua_State *L, int idx) +{ + /* Whether it is function. */ + int res = lua_isfunction(L, idx); + if (res == 1) + return 1; + + /* Whether it is cdata with metatype with __call field. */ + if (lua_type(L, idx) == LUA_TCDATA) + return luaL_cdata_iscallable(L, idx); + + /* Whether it has metatable with __call field. */ + res = luaL_getmetafield(L, idx, "__call"); + if (res == 1) + lua_pop(L, 1); /* Pop __call value. */ + return res; +} + lua_State * luaT_state(void) { diff --git a/src/lua/utils.h b/src/lua/utils.h index df4d50e1d..cf8c8d09d 100644 --- a/src/lua/utils.h +++ b/src/lua/utils.h @@ -449,6 +449,16 @@ luaT_state(void); LUA_API const char * luaT_tolstring(lua_State *L, int idx, size_t *ssize); +/** + * Check whether a Lua object is a function or has + * metatable/metatype with a __call field. + * + * Note: It does not check type of __call metatable/metatype + * field. + */ +LUA_API int +luaL_iscallable(lua_State *L, int idx); + /** \endcond public */ /** diff --git a/test/app-tap/module_api.c b/test/app-tap/module_api.c index 4abe1af48..b81a98056 100644 --- a/test/app-tap/module_api.c +++ b/test/app-tap/module_api.c @@ -440,6 +440,15 @@ test_tostring(lua_State *L) return 1; } +static int +test_iscallable(lua_State *L) +{ + int exp = lua_toboolean(L, 2); + int res = luaL_iscallable(L, 1); + lua_pushboolean(L, res == exp); + return 1; +} + LUA_API int luaopen_module_api(lua_State *L) { @@ -467,6 +476,7 @@ luaopen_module_api(lua_State *L) {"test_cpcall", test_cpcall}, {"test_state", test_state}, {"test_tostring", test_tostring}, + {"iscallable", test_iscallable}, {NULL, NULL} }; luaL_register(L, "module_api", lib); diff --git a/test/app-tap/module_api.test.lua b/test/app-tap/module_api.test.lua index f93257236..a6658cc61 100755 --- a/test/app-tap/module_api.test.lua +++ b/test/app-tap/module_api.test.lua @@ -3,7 +3,9 @@ local fio = require('fio') box.cfg{log = "tarantool.log"} -build_path = os.getenv("BUILDDIR") +-- Use BUILDDIR passed from test-run or cwd when run w/o +-- test-run to find test/app-tap/module_api.{so,dylib}. +build_path = os.getenv("BUILDDIR") or '.' package.cpath = fio.pathjoin(build_path, 'test/app-tap/?.so' ) .. ';' .. fio.pathjoin(build_path, 'test/app-tap/?.dylib') .. ';' .. package.cpath @@ -36,8 +38,86 @@ local function test_pushcdata(test, module) test:is(gc_counter, 1, 'pushcdata gc') end +local function test_iscallable(test, module) + local ffi = require('ffi') + + ffi.cdef([[ + struct cdata_1 { int foo; }; + struct cdata_2 { int foo; }; + ]]) + + local cdata_1 = ffi.new('struct cdata_1') + local cdata_1_ref = ffi.new('struct cdata_1 &') + local cdata_2 = ffi.new('struct cdata_2') + local cdata_2_ref = ffi.new('struct cdata_2 &') + + local nop = function() end + + ffi.metatype('struct cdata_2', { + __call = nop, + }) + + local cases = { + { + obj = nop, + exp = true, + description = 'function', + }, + { + obj = nil, + exp = false, + description = 'nil', + }, + { + obj = 1, + exp = false, + description = 'number', + }, + { + obj = {}, + exp = false, + description = 'table without metatable', + }, + { + obj = setmetatable({}, {}), + exp = false, + description = 'table without __call metatable field', + }, + { + obj = setmetatable({}, {__call = nop}), + exp = true, + description = 'table with __call metatable field' + }, + { + obj = cdata_1, + exp = false, + description = 'cdata without __call metatable field', + }, + { + obj = cdata_1_ref, + exp = false, + description = 'cdata reference without __call metatable field', + }, + { + obj = cdata_2, + exp = true, + description = 'cdata with __call metatable field', + }, + { + obj = cdata_2_ref, + exp = true, + description = 'cdata reference with __call metatable field', + }, + } + + test:plan(#cases) + for _, case in ipairs(cases) do + test:ok(module.iscallable(case.obj, case.exp), case.description) + end +end + local test = require('tap').test("module_api", function(test) - test:plan(23) + test:plan(24) local status, module = pcall(require, 'module_api') test:is(status, true, "module") test:ok(status, "module is loaded") @@ -62,6 +142,7 @@ local test = require('tap').test("module_api", function(test) test:like(msg, 'luaT_error', 'luaT_error') test:test("pushcdata", test_pushcdata, module) + test:test("iscallable", test_iscallable, module) space:drop() end) -- 2.20.1