Method createMapUpdate

compiler/map.go:120–148

createMapUpdate updates a map key to a given value, by creating an appropriate runtime call.

(keyType types.Type, m, key, value llvm.Value, pos token.Pos)

// createMapUpdate updates a map key to a given value, by creating an
// appropriate runtime call.
func (b *builder) createMapUpdate(keyType types.Type, m, key, value llvm.Value, pos token.Pos) {
	valueAlloca, valueSize := b.createTemporaryAlloca(value.Type(), "hashmap.value")
	b.CreateStore(value, valueAlloca)
	origKeyType := keyType
	keyType = keyType.Underlying()
	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
		// key is a string
		params := []llvm.Value{m, key, valueAlloca}
		b.createRuntimeCall("hashmapStringSet", params, "")
	} else if hashmapIsBinaryKey(keyType) {
		// key can be compared with runtime.memequal
		keyAlloca, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
		b.CreateStore(key, keyAlloca)
		b.zeroUndefBytes(b.getLLVMType(keyType), keyAlloca)
		params := []llvm.Value{m, keyAlloca, valueAlloca}
		b.createRuntimeCall("hashmapBinarySet", params, "")
		b.emitLifetimeEnd(keyAlloca, keySize)
	} else {
		// Key is not trivially comparable, so compare it as an interface instead.
		itfKey := key
		if _, ok := keyType.(*types.Interface); !ok {
			// Not already an interface, so convert it to an interface first.
			itfKey = b.createMakeInterface(key, origKeyType, pos)
		}
		params := []llvm.Value{m, itfKey, valueAlloca}
		b.createRuntimeCall("hashmapInterfaceSet", params, "")
	}
	b.emitLifetimeEnd(valueAlloca, valueSize)
}

// createMapDelete deletes a key from a map by calling the appropriate runtime
// function. It is the implementation of the Go delete() builtin.