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| author | Richard Musiol <mail@richard-musiol.de> | 2021-10-24 12:28:18 +0200 |
|---|---|---|
| committer | Dmitri Shuralyov <dmitshur@golang.org> | 2021-10-28 18:01:38 +0000 |
| commit | 900443349b17bb1f989daa64856546955c70d104 (patch) | |
| tree | a9f78754a9a62fa154165d84b79db2fa85ceec56 | |
| parent | 8c9c1487727a5e7938ca6ee7440334123a467b25 (diff) | |
| download | go-900443349b17bb1f989daa64856546955c70d104.tar.gz go-900443349b17bb1f989daa64856546955c70d104.zip | |
[release-branch.go1.16] cmd/link: increase reserved space for passing env on wasm
On wasm, the wasm_exec.js helper passes the command line arguments and
environment variables via a reserved space in the wasm linear memory.
Increase this reserved space from 4096 to 8192 bytes so more environment
variables can fit into the limit.
Later, after https://golang.org/cl/350737 landed, we can switch to the
WASI interface for getting the arguments and environment. This would
remove the limit entirely.
Updates #49011.
Fixes #49153.
Change-Id: I48a6e952a97d33404ed692c98e9b49c5cd6b269b
Reviewed-on: https://go-review.googlesource.com/c/go/+/358194
Trust: Richard Musiol <neelance@gmail.com>
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit 252324e879e32f948d885f787decf8af06f82be9)
Reviewed-on: https://go-review.googlesource.com/c/go/+/359400
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
| -rw-r--r-- | misc/wasm/wasm_exec.js | 4 | ||||
| -rw-r--r-- | src/cmd/link/internal/ld/data.go | 7 |
2 files changed, 6 insertions, 5 deletions
diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js index a0a264278b..48164c3a4b 100644 --- a/misc/wasm/wasm_exec.js +++ b/misc/wasm/wasm_exec.js @@ -566,9 +566,9 @@ // The linker guarantees global data starts from at least wasmMinDataAddr. // Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr. - const wasmMinDataAddr = 4096 + 4096; + const wasmMinDataAddr = 4096 + 8192; if (offset >= wasmMinDataAddr) { - throw new Error("command line too long"); + throw new Error("total length of command line and environment variables exceeds limit"); } this._inst.exports.run(argc, argv); diff --git a/src/cmd/link/internal/ld/data.go b/src/cmd/link/internal/ld/data.go index 54a1d188cd..7028b85cac 100644 --- a/src/cmd/link/internal/ld/data.go +++ b/src/cmd/link/internal/ld/data.go @@ -2330,10 +2330,11 @@ func assignAddress(ctxt *Link, sect *sym.Section, n int, s loader.Sym, va uint64 return sect, n, va } -// On Wasm, we reserve 4096 bytes for zero page, then 4096 bytes for wasm_exec.js -// to store command line args. Data sections starts from at least address 8192. +// On Wasm, we reserve 4096 bytes for zero page, then 8192 bytes for wasm_exec.js +// to store command line args and environment variables. +// Data sections starts from at least address 12288. // Keep in sync with wasm_exec.js. -const wasmMinDataAddr = 4096 + 4096 +const wasmMinDataAddr = 4096 + 8192 // address assigns virtual addresses to all segments and sections and // returns all segments in file order. |