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// +build darwin linux,!baremetal,!wasi freebsd,!baremetal
// +build !nintendoswitch
// +build gc.conservative gc.leaking
package runtime
var heapSize uintptr = 128 * 1024 // small amount to start
const heapMaxSize = 1 * 1024 * 1024 * 1024 // 1GB for the entire heap
var heapStart, heapEnd uintptr
func preinit() {
// Allocate a large chunk of virtual memory. Because it is virtual, it won't
// really be allocated in RAM. Memory will only be allocated when it is
// first touched.
addr := mmap(nil, heapMaxSize, flag_PROT_READ|flag_PROT_WRITE, flag_MAP_PRIVATE|flag_MAP_ANONYMOUS, -1, 0)
heapStart = uintptr(addr)
heapEnd = heapStart + heapSize
}
// growHeap tries to grow the heap size. It returns true if it succeeds, false
// otherwise.
func growHeap() bool {
if heapSize == heapMaxSize {
// Already at the max. If we run out of memory, we should consider
// increasing heapMaxSize on 64-bit systems.
return false
}
// Grow the heap size used by the program.
heapSize = (heapSize * 4 / 3) &^ 4095 // grow by around 33%
if heapSize > heapMaxSize {
heapSize = heapMaxSize
}
setHeapEnd(heapStart + heapSize)
return true
}
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