dimgigov
c83f6d5994
Implement MVP closures — anonymous functions without captures.
Syntax:
|a: int, b: int| -> int { return a + b; }
Changes:
- ast.bux + ast.nim: add ekClosure AST node
- parser.bux + parser.nim: parse |params| -> Ret { body }
- sema.bux + sema.nim: type-check closure params/body, return tyFunc
- hir_lower.bux + hir_lower.nim: generate __closure_N function + hAddrOf
- lir_c_backend.nim: fix function-pointer variable declaration (cParamDecl)
- C backend: closures compile to global functions with unique names
Test: _test_closure/src/Main.bux
- Closure as variable
- Closure passed to higher-order function
- Address of named function as function pointer
Both bootstrap and selfhost compilers build and pass the test.
68 lines
1.1 KiB
C
68 lines
1.1 KiB
C
// Generated by Bux C Backend v2
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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typedef const char* String;
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typedef unsigned char uint8;
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typedef unsigned short uint16;
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typedef unsigned int uint32;
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typedef unsigned long long uint64;
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typedef signed char int8;
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typedef short int16;
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typedef long long int64;
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typedef float float32;
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typedef double float64;
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typedef char char8;
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void* bux_alloc(unsigned int size);
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void bux_free(void* ptr);
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int Apply(int x, int (*op)(int));
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int Double(int x);
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int __closure_2(int a, int b);
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int __closure_3(int x);
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int main();
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void PrintInt(int x);
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void PrintLine(String msg);
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int Apply(int x, int (*op)(int)) {
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return op(x);
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}
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int Double(int x) {
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return x * 2;
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}
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int __closure_2(int a, int b) {
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return a + b;
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}
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int __closure_3(int x) {
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return x * 3;
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}
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int main() {
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int (*add)(int, int) = &__closure_2;
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int sum = add(3, 4);
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PrintInt(sum);
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PrintLine("");
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int result = Apply(5, &__closure_3);
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PrintInt(result);
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PrintLine("");
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int (*d)(int) = &Double;
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PrintInt(d(7));
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PrintLine("");
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return 0;
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}
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