我觉得我已经问过这个问题,并得到了一个答案,但我找不到那个问题。
哈希表和映射如
ATS2 tutorial
有未记录的要求。最大的问题是,我无法从没有提供这些需求所导致的错误中看出这些需求。
例如,此字符串->数据类型映射:
#include "share/atspre_staload.hats"
#include "share/atspre_staload_libats_ML.hats"
datatype example = example of (string)
local
typedef key = string
and itm = example
staload "libats/ML/SATS/funmap.sats"
in
#include "libats/ML/HATS/myfunmap.hats"
end
val test = myfunmap_nil()
implement main0() = ()
生成失败,出现以下错误:
patscc -DATS_MEMALLOC_GCBDW -o test test.dats -latslib -lgc
test_dats.c:20972:54: warning: implicit declaration of function 'S2Ecst' is invalid in C99 [-Wimplicit-function-declaration]
ATSINSmove(tmp859__1, PMVtmpltcstmat[0](tostrptr_val<S2Ecst(example)>)(arg1)) ;
^
test_dats.c:20972:61: error: use of undeclared identifier 'example'
ATSINSmove(tmp859__1, PMVtmpltcstmat[0](tostrptr_val<S2Ecst(example)>)(arg1)) ;
^
test_dats.c:20972:41: error: use of undeclared identifier 'tostrptr_val'
ATSINSmove(tmp859__1, PMVtmpltcstmat[0](tostrptr_val<S2Ecst(example)>)(arg1)) ;
^
test_dats.c:20972:70: error: expected expression
ATSINSmove(tmp859__1, PMVtmpltcstmat[0](tostrptr_val<S2Ecst(example)>)(arg1)) ;
^
test_dats.c:20972:23: error: use of undeclared identifier 'PMVtmpltcstmat'
ATSINSmove(tmp859__1, PMVtmpltcstmat[0](tostrptr_val<S2Ecst(example)>)(arg1)) ;
^
1 warning and 4 errors generated.
make: *** [test] Error 1
所以看起来
tostrptr_val<example>
未实现…
…在这一点上,在形成这个问题的过程中,我发现了序曲/*/ToString在哪里实现了这些东西。好啊。把我带到
#include "share/atspre_staload.hats"
#include "share/atspre_staload_libats_ML.hats"
datatype example = example of (string)
fn tostrptr_example(ex: example):<!wrt> Strptr1 = $UNSAFE.castvwtp0{Strptr1}("not implemented")
fn tostring_example(ex: example):<> string = "not implemented"
fn fprint_example(out: FILEref, ex: example): void = fprint!(out, tostring_example(ex))
implement tostrptr_val<example> = tostrptr_example
implement tostring_val<example> = tostring_example
implement fprint_val<example> = fprint_example
local
typedef key = string
and itm = example
staload "libats/ML/SATS/funmap.sats"
in
#include "libats/ML/HATS/myfunmap.hats"
end
val test = myfunmap_nil()
implement main0() = ()
但仍然无法编译:
patscc -DATS_MEMALLOC_GCBDW -o test test.dats -latslib -lgc
test_dats.c:20765:31: warning: implicit declaration of function 'fprint_example_5' is invalid in C99 [-Wimplicit-function-declaration]
ATSINSmove_void(tmpret822__1, fprint_example_5(env0, arg1)) ;
^
1 warning generated.
Undefined symbols for architecture x86_64:
"_fprint_example_5", referenced from:
_ATSLIB_056_libats_056_funmap_avltree__funmap_foreach__fwork__123__1 in test_dats-bd83ab.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [test] Error 1
我能从中解出来的就是/libats/dats/funmap_avltree.dats中的一个函数正在使用
example
在某种程度上我还没有准备好。