mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-04 19:17:47 +00:00
Ayke van Laethem
da0161d6ab
On WebAssembly it is possible to grow the heap with the memory.grow instruction. This commit implements this feature and with that also removes the -heap-size flag that was reportedly broken (I haven't verified that). This should make it easier to use TinyGo for WebAssembly, where there was no good reason to use a fixed heap size. This commit has no effect on baremetal targets with optimizations enabled.
55 lines
1.0 KiB
Go
55 lines
1.0 KiB
Go
// +build baremetal
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package runtime
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import (
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"unsafe"
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)
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//go:extern _heap_start
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var heapStartSymbol [0]byte
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//go:extern _heap_end
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var heapEndSymbol [0]byte
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//go:extern _globals_start
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var globalsStartSymbol [0]byte
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//go:extern _globals_end
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var globalsEndSymbol [0]byte
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//go:extern _stack_top
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var stackTopSymbol [0]byte
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var (
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heapStart = uintptr(unsafe.Pointer(&heapStartSymbol))
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heapEnd = uintptr(unsafe.Pointer(&heapEndSymbol))
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globalsStart = uintptr(unsafe.Pointer(&globalsStartSymbol))
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globalsEnd = uintptr(unsafe.Pointer(&globalsEndSymbol))
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stackTop = uintptr(unsafe.Pointer(&stackTopSymbol))
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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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// On baremetal, there is no way the heap can be grown.
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return false
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}
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//export malloc
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func libc_malloc(size uintptr) unsafe.Pointer {
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return alloc(size)
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}
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//export free
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func libc_free(ptr unsafe.Pointer) {
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free(ptr)
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}
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//go:linkname syscall_Exit syscall.Exit
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func syscall_Exit(code int) {
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abort()
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}
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const baremetal = true
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