Re: How to force an array literal into a read-only data segment?
On Thursday, 12 September 2019 at 08:54:09 UTC, a11e99z wrote: On Thursday, 12 September 2019 at 07:04:19 UTC, Max Samukha wrote: How to achieve the same for an array literal? The closest I could come: enum immutable(int[3]) _tmp = [1, 2, 3]; __gshared a = _tmp.ptr; Is it possible to force the array into rodata? https://p0nce.github.io/d-idioms/#Precomputed-tables-at-compile-time-through-CTFE static immutable(int[3]) _tmp = [1, 2, 3]; ? That looks the same as my example, where 'static' is redundant at the module level, and enum just removes the unneeded reference to the temporary from the object file. However, __gshared in my example does seem to be redundant - 'immutable' implies thread-shared in this case.
Re: How to force an array literal into a read-only data segment?
On Thursday, 12 September 2019 at 07:04:19 UTC, Max Samukha wrote: How to achieve the same for an array literal? The closest I could come: enum immutable(int[3]) _tmp = [1, 2, 3]; __gshared a = _tmp.ptr; Is it possible to force the array into rodata? https://p0nce.github.io/d-idioms/#Precomputed-tables-at-compile-time-through-CTFE static immutable(int[3]) _tmp = [1, 2, 3]; ?
How to force an array literal into a read-only data segment?
test.d: __gshared t = "text".ptr; As expected, the "text" literal ends up in a read-only data segment, with a pointer to it stored in a writable data segment (_TMP0 pointing into .rodata.str1.1): .data segment _D4test1tPya: dd offset FLAT:_TMP0@64 db 000h,000h,000h,000h ; .data ends Hex dump of section '.rodata.str1.1': 0x 74657874 00 text. How to achieve the same for an array literal? The closest I could come: enum immutable(int[3]) _tmp = [1, 2, 3]; __gshared a = _tmp.ptr; But the array is still placed into the writable segment: .data segment internal: db 001h,000h,000h,000h,002h,000h,000h,000h ; db 003h,000h,000h,000h,000h,000h,000h,000h ; _D4test1aPyi: dd offset FLAT:internal@64 db 000h,000h,000h,000h ; .data ends Is it possible to force the array into rodata?