package runtime

import "unsafe"

func sbrk(n uintptr) unsafe.Pointer {
	grow := divRoundUp(n, physPageSize)
	size := growMemory(int32(grow))
	if size < 0 {
		return nil
	}
	resetMemoryDataView()
	return unsafe.Pointer(uintptr(size) * physPageSize)
}

// Implemented in src/runtime/sys_wasm.s

	I64TruncF64U
	Return

TEXT runtime·exitThread(SB), NOSPLIT, $0-0
	UNDEF

TEXT runtime·osyield(SB), NOSPLIT, $0-0
	UNDEF

TEXT runtime·growMemory(SB), NOSPLIT, $0
	Get SP
	I32Load pages+0(FP)
	GrowMemory
	I32Store ret+8(FP)

	"I64Load16U",
	"I64Load32S",
	"I64Load32U",
	"I32Store",
	"I64Store",
	"F32Store",
	"F64Store",
	"I32Store8",
	"I32Store16",
	"I64Store8",
	"I64Store16",
	"I64Store32",
	"CurrentMemory",
	"GrowMemory",
	"I32Const",
	"I64Const",
	"F32Const",
	"F64Const",
	"I32Eqz",
	"I32Eq",
	"I32Ne",
	"I32LtS",
	"I32LtU",
	"I32GtS",
	"I32GtU",
	"I32LeS",
	"I32LeU",
	"I32GeS",
	"I32GeU",

}

// writeMemorySec writes the section that declares linear memories. Currently one linear memory is being used.
// Linear memory always starts at address zero. More memory can be requested with the GrowMemory instruction.
func writeMemorySec(ctxt *ld.Link, ldr *loader.Loader) {
	sizeOffset := writeSecHeader(ctxt, sectionMemory)

	dataSection := ldr.SymSect(ldr.Lookup("runtime.data", 0))