static bool
DynamicallyLinkModule(JSContext *cx, CallArgs args, AsmJSModule &module)
{
if (module.isLinked())
return LinkFail(cx, "As a temporary limitation, modules cannot be linked more than "
"once. This limitation should be removed in a future release. To "
"work around this, compile a second module (e.g., using the "
"Function constructor).");
RootedValue globalVal(cx, UndefinedValue());
if (args.length() > 0)
globalVal = args[0];
RootedValue importVal(cx, UndefinedValue());
if (args.length() > 1)
importVal = args[1];
RootedValue bufferVal(cx, UndefinedValue());
if (args.length() > 2)
bufferVal = args[2];
Rooted<ArrayBufferObject*> heap(cx);
if (module.hasArrayView()) {
if (!IsTypedArrayBuffer(bufferVal))
return LinkFail(cx, "bad ArrayBuffer argument");
heap = &bufferVal.toObject().as<ArrayBufferObject>();
if (!IsPowerOfTwo(heap->byteLength()) || heap->byteLength() < AsmJSAllocationGranularity)
return LinkFail(cx, "ArrayBuffer byteLength must be a power of two greater than or equal to 4096");
if (!ArrayBufferObject::prepareForAsmJS(cx, heap))
return LinkFail(cx, "Unable to prepare ArrayBuffer for asm.js use");
#if defined(JS_CPU_X86)
void *heapOffset = (void*)heap->dataPointer();
void *heapLength = (void*)heap->byteLength();
uint8_t *code = module.functionCode();
for (unsigned i = 0; i < module.numHeapAccesses(); i++) {
const AsmJSHeapAccess &access = module.heapAccess(i);
JSC::X86Assembler::setPointer(access.patchLengthAt(code), heapLength);
JSC::X86Assembler::setPointer(access.patchOffsetAt(code), heapOffset);
}
#elif defined(JS_CPU_ARM)
// Now the length of the array is know, patch all of the bounds check sites
// with the new length.
jit::IonContext ic(cx, NULL);
module.patchBoundsChecks(heap->byteLength());
#endif
}
AutoObjectVector ffis(cx);
if (!ffis.resize(module.numFFIs()))
return false;
for (unsigned i = 0; i < module.numGlobals(); i++) {
AsmJSModule::Global &global = module.global(i);
switch (global.which()) {
case AsmJSModule::Global::Variable:
if (!ValidateGlobalVariable(cx, module, global, importVal))
return false;
break;
case AsmJSModule::Global::FFI:
if (!ValidateFFI(cx, global, importVal, &ffis))
return false;
break;
case AsmJSModule::Global::ArrayView:
if (!ValidateArrayView(cx, global, globalVal, bufferVal))
return false;
break;
case AsmJSModule::Global::MathBuiltin:
if (!ValidateMathBuiltin(cx, global, globalVal))
return false;
break;
case AsmJSModule::Global::Constant:
if (!ValidateGlobalConstant(cx, global, globalVal))
return false;
break;
}
}
for (unsigned i = 0; i < module.numExits(); i++)
module.exitIndexToGlobalDatum(i).fun = &ffis[module.exit(i).ffiIndex()]->as<JSFunction>();
module.setIsLinked(heap);
return true;
}
