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Fix two wasm bugs #4567

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Fix two wasm bugs #4567

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@aykevl aykevl commented Oct 30, 2024

Fix two related bugs:

  1. time.Sleep in a normal (non-reactor) browser wasm binary would cause every subsequent exported function (//go:wasmexport) to fail.
  2. wasm code never returns to javascript after await go.run(instance) #4563

@aykevl aykevl changed the title Wasm exit Fix two wasm bugs Oct 30, 2024
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github-actions bot commented Oct 30, 2024

Size difference with the dev branch:

Binary size difference
 flash                          ram
 before   after   diff          before   after   diff
  16844   16844      0   0.00%    4324    4324      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
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  12232   12232      0   0.00%    3352    3352      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/pca9685/main.go
   6188    6188      0   0.00%    3288    3288      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setbuffer/main.go
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 119288  119288      0   0.00%    7848    7848      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 245452  245452      0   0.00%   10488   10488      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 103048  103048      0   0.00%    9816    9816      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
 338356  338356      0   0.00%   15396   15396      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 111500  111500      0   0.00%    7772    7772      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 154136  154136      0   0.00%    6540    6540      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 116992  116992      0   0.00%   13132   13132      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
 286056  286056      0   0.00%   17812   17812      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 287076  287076      0   0.00%   18212   18212      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
5326584 5326584      0   0.00%  811790  811790      0   0.00%

@aykevl aykevl force-pushed the wasm-exit branch 2 times, most recently from 5443a11 to 863fc40 Compare October 31, 2024 10:01
@@ -9,6 +11,7 @@ func callTestMain()

func main() {
// main.main is not used when using -buildmode=c-shared.
time.Sleep(time.Millisecond)
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Leftover debug? Otherwise a comment would be nice.

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Fixed! It's actually part of the test, I've added a comment.

This fixes a bug where `//go:wasmexport` functions would not be allowed
anymore after a call to `time.Sleep` (when using `-buildmode=default`).
Instead of hanging forever, it should return the exit code from os.Exit.
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LGTM

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3 participants