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wasi: simplify WASI memory management
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This commit migrates the WASI C++ code from UncheckedCalloc()
to std::vectors.

PR-URL: #33525
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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@cjihrig
cjihrig committed May 25, 2020
1 parent a4e6ef7 commit 698267c
Showing 1 changed file with 35 additions and 81 deletions.
116 changes: 35 additions & 81 deletions src/node_wasi.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -661,27 +661,24 @@ void WASI::FdPread(const FunctionCallbackInfo<Value>& args) {
iovs_ptr,
iovs_len * UVWASI_SERDES_SIZE_iovec_t);
CHECK_BOUNDS_OR_RETURN(args, mem_size, nread_ptr, UVWASI_SERDES_SIZE_size_t);
uvwasi_iovec_t* iovs = UncheckedCalloc<uvwasi_iovec_t>(iovs_len);
std::vector<uvwasi_iovec_t> iovs(iovs_len);
uvwasi_errno_t err;

if (iovs == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

err = uvwasi_serdes_readv_iovec_t(memory, mem_size, iovs_ptr, iovs, iovs_len);
err = uvwasi_serdes_readv_iovec_t(memory,
mem_size,
iovs_ptr,
iovs.data(),
iovs_len);
if (err != UVWASI_ESUCCESS) {
free(iovs);
args.GetReturnValue().Set(err);
return;
}

uvwasi_size_t nread;
err = uvwasi_fd_pread(&wasi->uvw_, fd, iovs, iovs_len, offset, &nread);
err = uvwasi_fd_pread(&wasi->uvw_, fd, iovs.data(), iovs_len, offset, &nread);
if (err == UVWASI_ESUCCESS)
uvwasi_serdes_write_size_t(memory, nread_ptr, nread);

free(iovs);
args.GetReturnValue().Set(err);
}

Expand Down Expand Up @@ -764,31 +761,29 @@ void WASI::FdPwrite(const FunctionCallbackInfo<Value>& args) {
mem_size,
nwritten_ptr,
UVWASI_SERDES_SIZE_size_t);
uvwasi_ciovec_t* iovs = UncheckedCalloc<uvwasi_ciovec_t>(iovs_len);
std::vector<uvwasi_ciovec_t> iovs(iovs_len);
uvwasi_errno_t err;

if (iovs == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

err = uvwasi_serdes_readv_ciovec_t(memory,
mem_size,
iovs_ptr,
iovs,
iovs.data(),
iovs_len);
if (err != UVWASI_ESUCCESS) {
free(iovs);
args.GetReturnValue().Set(err);
return;
}

uvwasi_size_t nwritten;
err = uvwasi_fd_pwrite(&wasi->uvw_, fd, iovs, iovs_len, offset, &nwritten);
err = uvwasi_fd_pwrite(&wasi->uvw_,
fd,
iovs.data(),
iovs_len,
offset,
&nwritten);
if (err == UVWASI_ESUCCESS)
uvwasi_serdes_write_size_t(memory, nwritten_ptr, nwritten);

free(iovs);
args.GetReturnValue().Set(err);
}

Expand All @@ -814,27 +809,24 @@ void WASI::FdRead(const FunctionCallbackInfo<Value>& args) {
iovs_ptr,
iovs_len * UVWASI_SERDES_SIZE_iovec_t);
CHECK_BOUNDS_OR_RETURN(args, mem_size, nread_ptr, UVWASI_SERDES_SIZE_size_t);
uvwasi_iovec_t* iovs = UncheckedCalloc<uvwasi_iovec_t>(iovs_len);
std::vector<uvwasi_iovec_t> iovs(iovs_len);
uvwasi_errno_t err;

if (iovs == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

err = uvwasi_serdes_readv_iovec_t(memory, mem_size, iovs_ptr, iovs, iovs_len);
err = uvwasi_serdes_readv_iovec_t(memory,
mem_size,
iovs_ptr,
iovs.data(),
iovs_len);
if (err != UVWASI_ESUCCESS) {
free(iovs);
args.GetReturnValue().Set(err);
return;
}

uvwasi_size_t nread;
err = uvwasi_fd_read(&wasi->uvw_, fd, iovs, iovs_len, &nread);
err = uvwasi_fd_read(&wasi->uvw_, fd, iovs.data(), iovs_len, &nread);
if (err == UVWASI_ESUCCESS)
uvwasi_serdes_write_size_t(memory, nread_ptr, nread);

free(iovs);
args.GetReturnValue().Set(err);
}

Expand Down Expand Up @@ -996,31 +988,24 @@ void WASI::FdWrite(const FunctionCallbackInfo<Value>& args) {
mem_size,
nwritten_ptr,
UVWASI_SERDES_SIZE_size_t);
uvwasi_ciovec_t* iovs = UncheckedCalloc<uvwasi_ciovec_t>(iovs_len);
std::vector<uvwasi_ciovec_t> iovs(iovs_len);
uvwasi_errno_t err;

if (iovs == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

err = uvwasi_serdes_readv_ciovec_t(memory,
mem_size,
iovs_ptr,
iovs,
iovs.data(),
iovs_len);
if (err != UVWASI_ESUCCESS) {
free(iovs);
args.GetReturnValue().Set(err);
return;
}

uvwasi_size_t nwritten;
err = uvwasi_fd_write(&wasi->uvw_, fd, iovs, iovs_len, &nwritten);
err = uvwasi_fd_write(&wasi->uvw_, fd, iovs.data(), iovs_len, &nwritten);
if (err == UVWASI_ESUCCESS)
uvwasi_serdes_write_size_t(memory, nwritten_ptr, nwritten);

free(iovs);
args.GetReturnValue().Set(err);
}

Expand Down Expand Up @@ -1435,21 +1420,8 @@ void WASI::PollOneoff(const FunctionCallbackInfo<Value>& args) {
mem_size,
nevents_ptr,
UVWASI_SERDES_SIZE_size_t);
uvwasi_subscription_t* in =
UncheckedCalloc<uvwasi_subscription_t>(nsubscriptions);

if (in == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

uvwasi_event_t* out = UncheckedCalloc<uvwasi_event_t>(nsubscriptions);

if (out == nullptr) {
free(in);
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}
std::vector<uvwasi_subscription_t> in(nsubscriptions);
std::vector<uvwasi_event_t> out(nsubscriptions);

for (uint32_t i = 0; i < nsubscriptions; ++i) {
uvwasi_serdes_read_subscription_t(memory, in_ptr, &in[i]);
Expand All @@ -1458,8 +1430,8 @@ void WASI::PollOneoff(const FunctionCallbackInfo<Value>& args) {

uvwasi_size_t nevents;
uvwasi_errno_t err = uvwasi_poll_oneoff(&wasi->uvw_,
in,
out,
in.data(),
out.data(),
nsubscriptions,
&nevents);
if (err == UVWASI_ESUCCESS) {
Expand All @@ -1471,8 +1443,6 @@ void WASI::PollOneoff(const FunctionCallbackInfo<Value>& args) {
}
}

free(in);
free(out);
args.GetReturnValue().Set(err);
}

Expand Down Expand Up @@ -1563,20 +1533,13 @@ void WASI::SockRecv(const FunctionCallbackInfo<Value>& args) {
ri_data_len * UVWASI_SERDES_SIZE_iovec_t);
CHECK_BOUNDS_OR_RETURN(args, mem_size, ro_datalen_ptr, 4);
CHECK_BOUNDS_OR_RETURN(args, mem_size, ro_flags_ptr, 4);
uvwasi_iovec_t* ri_data = UncheckedCalloc<uvwasi_iovec_t>(ri_data_len);

if (ri_data == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

std::vector<uvwasi_iovec_t> ri_data(ri_data_len);
uvwasi_errno_t err = uvwasi_serdes_readv_iovec_t(memory,
mem_size,
ri_data_ptr,
ri_data,
ri_data.data(),
ri_data_len);
if (err != UVWASI_ESUCCESS) {
free(ri_data);
args.GetReturnValue().Set(err);
return;
}
Expand All @@ -1585,7 +1548,7 @@ void WASI::SockRecv(const FunctionCallbackInfo<Value>& args) {
uvwasi_roflags_t ro_flags;
err = uvwasi_sock_recv(&wasi->uvw_,
sock,
ri_data,
ri_data.data(),
ri_data_len,
ri_flags,
&ro_datalen,
Expand All @@ -1595,7 +1558,6 @@ void WASI::SockRecv(const FunctionCallbackInfo<Value>& args) {
uvwasi_serdes_write_roflags_t(memory, ro_flags_ptr, ro_flags);
}

free(ri_data);
args.GetReturnValue().Set(err);
}

Expand Down Expand Up @@ -1632,35 +1594,27 @@ void WASI::SockSend(const FunctionCallbackInfo<Value>& args) {
mem_size,
so_datalen_ptr,
UVWASI_SERDES_SIZE_size_t);
uvwasi_ciovec_t* si_data = UncheckedCalloc<uvwasi_ciovec_t>(si_data_len);

if (si_data == nullptr) {
args.GetReturnValue().Set(UVWASI_ENOMEM);
return;
}

std::vector<uvwasi_ciovec_t> si_data(si_data_len);
uvwasi_errno_t err = uvwasi_serdes_readv_ciovec_t(memory,
mem_size,
si_data_ptr,
si_data,
si_data.data(),
si_data_len);
if (err != UVWASI_ESUCCESS) {
free(si_data);
args.GetReturnValue().Set(err);
return;
}

uvwasi_size_t so_datalen;
err = uvwasi_sock_send(&wasi->uvw_,
sock,
si_data,
si_data.data(),
si_data_len,
si_flags,
&so_datalen);
if (err == UVWASI_ESUCCESS)
uvwasi_serdes_write_size_t(memory, so_datalen_ptr, so_datalen);

free(si_data);
args.GetReturnValue().Set(err);
}

Expand Down

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