mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-05 03:27:48 +00:00
Ayke van Laethem
959442dc82
This commit does two things:
1. It makes it possible to grow the heap on Linux and MacOS by
allocating 1GB of virtual memory on startup and then slowly using it
as necessary, when running out of available heap space.
2. It switches the default GC to be the conservative GC (previously
extalloc). This is good for consistency with other platforms that
all use this same GC.
This makes the extalloc GC unused by default.
38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
// +build darwin linux,!baremetal,!wasi freebsd,!baremetal
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// +build !nintendoswitch
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// +build gc.conservative gc.leaking
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package runtime
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var heapSize uintptr = 128 * 1024 // small amount to start
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const heapMaxSize = 1 * 1024 * 1024 * 1024 // 1GB for the entire heap
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var heapStart, heapEnd uintptr
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func preinit() {
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// Allocate a large chunk of virtual memory. Because it is virtual, it won't
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// really be allocated in RAM. Memory will only be allocated when it is
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// first touched.
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addr := mmap(nil, heapMaxSize, flag_PROT_READ|flag_PROT_WRITE, flag_MAP_PRIVATE|flag_MAP_ANONYMOUS, -1, 0)
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heapStart = uintptr(addr)
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heapEnd = heapStart + heapSize
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}
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// growHeap tries to grow the heap size. It returns true if it succeeds, false
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// otherwise.
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func growHeap() bool {
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if heapSize == heapMaxSize {
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// Already at the max. If we run out of memory, we should consider
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// increasing heapMaxSize on 64-bit systems.
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return false
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}
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// Grow the heap size used by the program.
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heapSize = (heapSize * 4 / 3) &^ 4095 // grow by around 33%
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if heapSize > heapMaxSize {
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heapSize = heapMaxSize
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}
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setHeapEnd(heapStart + heapSize)
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return true
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}
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