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[WebAssembly] Enable Wasm EH features only once #124042

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merged 1 commit into from
Jan 23, 2025
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[WebAssembly] Enable Wasm EH features only once #124042

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8 changes: 8 additions & 0 deletions clang/lib/Driver/ToolChains/WebAssembly.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -347,6 +347,9 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
// Bans incompatible options for Wasm EH / SjLj. We don't allow using
// different modes for EH and SjLj.
auto BanIncompatibleOptionsForWasmEHSjLj = [&](StringRef CurOption) {
static bool HasRun = false;
if (HasRun)
return;
if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
options::OPT_mexception_handing, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
Expand All @@ -370,10 +373,14 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
<< CurOption << Option;
}
}
HasRun = true;
};

// Enable necessary features for Wasm EH / SjLj in the backend.
auto EnableFeaturesForWasmEHSjLj = [&]() {
static bool HasRun = false;
if (HasRun)
return;
CC1Args.push_back("-target-feature");
CC1Args.push_back("+exception-handling");
// The standardized Wasm EH spec requires multivalue and reference-types.
Expand All @@ -383,6 +390,7 @@ void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
CC1Args.push_back("+reference-types");
// Backend needs '-exception-model=wasm' to use Wasm EH instructions
CC1Args.push_back("-exception-model=wasm");
HasRun = true;
};

if (DriverArgs.getLastArg(options::OPT_fwasm_exceptions)) {
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