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cgo: add support for #cgo noescape lines

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Here is the proposal:
https://github.com/golang/go/issues/56378

They are documented here:
https://pkg.go.dev/cmd/cgo@master#hdr-Optimizing_calls_of_C_code

This would have been very useful to fix
https://github.com/tinygo-org/bluetooth/issues/176 in a nice way. That
bug is now fixed in a different way using a wrapper function, but once
this new noescape pragma gets included in TinyGo we could remove the
workaround and use `#cgo noescape` instead.
This commit is contained in:
Ayke van Laethem
2023-09-02 13:52:21 +02:00
committed by Ron Evans
parent fd625f7265
commit b7a3fd8d2f
6 changed files with 87 additions and 8 deletions
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cgo/testdata/errors.out.go
Vendored
+10 -7
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@@ -1,14 +1,17 @@
// CGo errors:
// testdata/errors.go:14:1: missing function name in #cgo noescape line
// testdata/errors.go:15:1: multiple function names in #cgo noescape line
// testdata/errors.go:4:2: warning: some warning
// testdata/errors.go:11:9: error: unknown type name 'someType'
// testdata/errors.go:26:5: warning: another warning
// testdata/errors.go:13:23: unexpected token ), expected end of expression
// testdata/errors.go:21:26: unexpected token ), expected end of expression
// testdata/errors.go:16:33: unexpected token ), expected end of expression
// testdata/errors.go:17:34: unexpected token ), expected end of expression
// testdata/errors.go:31:5: warning: another warning
// testdata/errors.go:18:23: unexpected token ), expected end of expression
// testdata/errors.go:26:26: unexpected token ), expected end of expression
// testdata/errors.go:21:33: unexpected token ), expected end of expression
// testdata/errors.go:22:34: unexpected token ), expected end of expression
// -: unexpected token INT, expected end of expression
// testdata/errors.go:30:35: unexpected number of parameters: expected 2, got 3
// testdata/errors.go:31:31: unexpected number of parameters: expected 2, got 1
// testdata/errors.go:35:35: unexpected number of parameters: expected 2, got 3
// testdata/errors.go:36:31: unexpected number of parameters: expected 2, got 1
// testdata/errors.go:3:1: function "unusedFunction" in #cgo noescape line is not used
// Type checking errors after CGo processing:
// testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as C.char value in variable declaration (overflows)