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[FunC] Add pragma remove-unused-functions for simple dead code elimination

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Aleksandr Kirsanov 2024-05-06 18:36:37 +03:00
parent 0628e17c7d
commit acf0043342
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4 changed files with 119 additions and 5 deletions
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47
crypto/func/auto-tests/tests/remove-unused-functions.fc Normal file
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#pragma remove-unused-functions;
int unused1() { return 2; }
int unused2() { return unused1(); }
int unused3(int x) { return x * 2 + unused2(); }
int used_from_noncall1() { return 10; }
int used_as_noncall1() { return used_from_noncall1(); }
const int int20 = 20;
int used_from_noncall2() { return int20; }
int used_as_noncall2() { return 0 * 0 + used_from_noncall2() + (0 << 0); }
global int unused_gv;
global _ used_gv;
(() -> int) receiveGetter() { return used_as_noncall2; }
(int) usedButOptimizedOut(int x) pure { return x + 2; }
(int, int, int) main() {
used_gv = 1;
used_gv = used_gv + 2;
var getter1 = used_as_noncall1;
var getter2 = receiveGetter();
usedButOptimizedOut(used_gv);
return (used_gv, getter1(), getter2());
}
{-
TESTCASE | 0 | | 3 10 20
@fif_codegen DECLPROC used_as_noncall1
@fif_codegen DECLGLOBVAR used_gv
@fif_codegen_avoid DECLPROC unused1
@fif_codegen_avoid DECLPROC unused2
@fif_codegen_avoid DECLPROC unused3
@fif_codegen_avoid DECLGLOBVAR unused_gv
Note, that `usedButOptimizedOut()` (a pure function which result is unused)
is currently codegenerated, since it's formally reachable.
This is because optimizing code is a moment of codegen for now (later than marking unused symbols).
@fif_codegen DECLPROC usedButOptimizedOut
@fif_codegen_avoid usedButOptimizedOut CALLDICT
-}