static bool
DecodeFunctionBody(JSContext* cx, Decoder& d, ModuleGenerator& mg, uint32_t funcIndex)
{
int64_t before = PRMJ_Now();
uint32_t bodySize;
if (!d.readVarU32(&bodySize))
return Fail(cx, d, "expected number of function body bytes");
if (d.bytesRemain() < bodySize)
return Fail(cx, d, "function body length too big");
const uint8_t* bodyBegin = d.currentPosition();
const uint8_t* bodyEnd = bodyBegin + bodySize;
FunctionGenerator fg;
if (!mg.startFuncDef(d.currentOffset(), &fg))
return false;
ValTypeVector locals;
if (!locals.appendAll(mg.funcSig(funcIndex).args()))
return false;
if (!DecodeLocalEntries(d, &locals))
return Fail(cx, d, "failed decoding local entries");
for (ValType type : locals) {
if (!CheckValType(cx, d, type))
return false;
}
FunctionDecoder f(cx, d, mg, fg, funcIndex, locals);
ExprType type = ExprType::Void;
while (d.currentPosition() < bodyEnd) {
if (!DecodeExpr(f, &type))
return false;
}
if (!CheckType(f, type, f.sig().ret()))
return false;
if (d.currentPosition() != bodyEnd)
return Fail(cx, d, "function body length mismatch");
if (!fg.bytes().resize(bodySize))
return false;
memcpy(fg.bytes().begin(), bodyBegin, bodySize);
int64_t after = PRMJ_Now();
unsigned generateTime = (after - before) / PRMJ_USEC_PER_MSEC;
return mg.finishFuncDef(funcIndex, generateTime, &fg);
}
static bool
DecodeFuncBody(JSContext* cx, Decoder& d, ModuleGenerator& mg, FunctionGenerator& fg,
uint32_t funcIndex)
{
const uint8_t* bodyBegin = d.currentPosition();
FunctionDecoder f(cx, d, mg, fg, funcIndex);
if (!DecodeExpr(f, f.ret()))
return false;
const uint8_t* bodyEnd = d.currentPosition();
uintptr_t bodyLength = bodyEnd - bodyBegin;
if (!fg.bytecode().resize(bodyLength))
return false;
PodCopy(fg.bytecode().begin(), bodyBegin, bodyLength);
return true;
}
bool waitForBytes(size_t numBytes) {
numBytes = Min(numBytes, d_.bytesRemain());
const uint8_t* requiredEnd = d_.currentPosition() + numBytes;
auto streamEnd = streamEnd_.lock();
while (streamEnd < requiredEnd) {
if (cancelled_)
return false;
streamEnd.wait();
}
return true;
}