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handle null dereference in imagemethods + nicer panic

This commit is contained in:
Peli de Halleux 2016-04-14 07:39:24 -07:00
parent e46e02ad5e
commit fc7325b0f6
1 changed files with 74 additions and 27 deletions
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101
sim/libmbit.ts
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@ -77,9 +77,45 @@ namespace pxsim {
})
}
}
/**
* Error codes used in the micro:bit runtime.
*/
export enum PanicCode {
// PANIC Codes. These are not return codes, but are terminal conditions.
// These induce a panic operation, where all code stops executing, and a panic state is
// entered where the panic code is diplayed.
// Out out memory error. Heap storage was requested, but is not available.
MICROBIT_OOM = 20,
// Corruption detected in the micro:bit heap space
MICROBIT_HEAP_ERROR = 30,
// Dereference of a NULL pointer through the ManagedType class,
MICROBIT_NULL_DEREFERENCE = 40,
};
export function panic(code: number) {
console.log("PANIC:", code)
led.setBrightness(255);
let img = board().image;
img.clear();
img.set(0, 4, 255);
img.set(1, 3, 255);
img.set(2, 3, 255);
img.set(3, 3, 255);
img.set(4, 4, 255);
img.set(0, 0, 255);
img.set(1, 0, 255);
img.set(0, 1, 255);
img.set(1, 1, 255);
img.set(3, 0, 255);
img.set(4, 0, 255);
img.set(3, 1, 255);
img.set(4, 1, 255);
runtime.updateDisplay();
throw new Error("PANIC " + code)
}
@ -285,8 +321,8 @@ namespace pxsim.input {
default: return Math.floor(Math.sqrt(acc.instantaneousAccelerationSquared()));
}
}
export function rotation(kind : number) : number {
export function rotation(kind: number): number {
let b = board();
let acc = b.accelerometer;
acc.activate();
@ -294,11 +330,11 @@ namespace pxsim.input {
let y = acc.getX(MicroBitCoordinateSystem.NORTH_EAST_DOWN);
let z = acc.getX(MicroBitCoordinateSystem.NORTH_EAST_DOWN);
let roll = Math.atan2(y,z);
let pitch = Math.atan(-x / (y*Math.sin(roll) + z*Math.cos(roll)));
let roll = Math.atan2(y, z);
let pitch = Math.atan(-x / (y * Math.sin(roll) + z * Math.cos(roll)));
let r = 0;
switch(kind) {
switch (kind) {
case 0: r = pitch; break;
case 1: r = roll; break;
}
@ -364,8 +400,8 @@ namespace pxsim.led {
board().displayMode = mode;
runtime.queueDisplayUpdate()
}
export function screenshot() : Image {
export function screenshot(): Image {
let img = createImage(5)
board().image.copyTo(0, 5, img, 0);
return img;
@ -515,30 +551,41 @@ namespace pxsim.images {
}
namespace pxsim.ImageMethods {
export function showImage(i: Image, offset: number) {
// TODO offset?
i.copyTo(0, 5, board().image, 0)
runtime.queueDisplayUpdate()
}
export function plotImage(leds: Image, offset:number): void {
export function showImage(leds: Image, offset: number) {
if (!leds) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
leds.copyTo(offset, 5, board().image, 0)
runtime.queueDisplayUpdate()
}
export function clear(i: Image) {
i.clear();
}
export function setPixelBrightness(i:Image, x:number, y:number, b:number) {
i.set(x,y,b);
}
export function pixelBrightness(i:Image, x:number, y:number) : number {
return i.get(x,y);
export function plotImage(leds: Image, offset: number): void {
if (!leds) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
leds.copyTo(offset, 5, board().image, 0)
runtime.queueDisplayUpdate()
}
export function clear(leds: Image) {
if (!leds) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
leds.clear();
}
export function setPixelBrightness(i: Image, x: number, y: number, b: number) {
if (!i) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
i.set(x, y, b);
}
export function pixelBrightness(i: Image, x: number, y: number): number {
if (!i) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
return i.get(x, y);
}
export function scrollImage(leds: Image, interval: number, stride: number): void {
if (!leds) panic(PanicCode.MICROBIT_NULL_DEREFERENCE);
let cb = getResume()
let off = stride > 0 ? 0 : leds.width - 1;
let display = board().image;
@ -555,5 +602,5 @@ namespace pxsim.ImageMethods {
},
whenDone: cb
})
}
}
}