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| author |  Abseil Team <absl-team@google.com> | 2023-05-30 15:28:44 -0700 |
|---|---|---|
| committer |  Copybara-Service <copybara-worker@google.com> | 2023-05-30 15:29:44 -0700 |
| commit | e077941c43da6b050101b5af151396053fb251d8 (patch) | |
| tree | 42e8a9d01589168d2102751a2ad8a5a6566eb87b | |
| parent | 8e45685002488b55f24cb67a795eaa8d1c3297a1 (diff) | |
For web assembly, implement WriteToStderr as emscripten_err.
This avoids the need to use filesystem APIs just to write to stderr, which emscripten implements the same as this under the hood.
PiperOrigin-RevId: 536525710
Change-Id: I0a647a4593eacfba324505b6e8c4acfb577ac839
| -rw-r--r-- | absl/log/internal/globals.cc | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/absl/log/internal/globals.cc b/absl/log/internal/globals.cc index 863b047f..9ba997d5 100644 --- a/absl/log/internal/globals.cc +++ b/absl/log/internal/globals.cc @@ -16,6 +16,9 @@ #include <atomic> #include <cstdio> +#if defined(__EMSCRIPTEN__) +#include <emscripten/console.h> +#endif #include "absl/base/attributes.h" #include "absl/base/config.h" @@ -55,9 +58,21 @@ void SetInitialized() { } void WriteToStderr(absl::string_view message, absl::LogSeverity severity) { +#if defined(__EMSCRIPTEN__) + // In WebAssembly, bypass filesystem emulation via fwrite. + // TODO(b/282811932): Avoid this copy if these emscripten functions can + // be updated to accept size directly. + std::string null_terminated_message(message); + if (!null_terminated_message.empty() && + null_terminated_message.back() == '\n') { + null_terminated_message.pop_back(); + } + _emscripten_err(null_terminated_message.c_str()); +#else // Avoid using std::cerr from this module since we may get called during // exit code, and cerr may be partially or fully destroyed by then. std::fwrite(message.data(), message.size(), 1, stderr); +#endif #if defined(_WIN64) || defined(_WIN32) || defined(_WIN16) // C99 requires stderr to not be fully-buffered by default (7.19.3.7), but |