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commit fde5924dcc69fe814085482df259b8cfee236f2c
Author: Serge Pavlov <sepavloff@gmail.com>
Date: Thu Jul 13 11:49:00 2023 +0700
[clang] Reset FP options before template instantiation
AST nodes that may depend on FP options keep them as a difference
relative to the options outside the AST node. At the moment of
instantiation the FP options may be different from the default values,
defined by command-line option. In such case FP attributes would have
unexpected values. For example, the code:
template <class C> void func_01(int last, C) {
func_01(last, int());
}
void func_02() { func_01(0, 1); }
#pragma STDC FENV_ACCESS ON
caused compiler crash, because template instantiation takes place at the
end of translation unit, where pragma STDC FENV_ACCESS is in effect. As
a result, code in the template instantiation would use constrained
intrinsics while the function does not have StrictFP attribute.
To solve this problem, FP attributes in Sema must be set to default
values, defined by command line options.
This change resolves https://github.com/llvm/llvm-project/issues/63542.
Differential Revision: https://reviews.llvm.org/D154359
diff --git clang/lib/Sema/SemaTemplateInstantiateDecl.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 492fe8ba1b14..9e5f85b0f916 100644
--- clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -5087,6 +5087,10 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
// PushDeclContext because we don't have a scope.
Sema::ContextRAII savedContext(*this, Function);
+ FPFeaturesStateRAII SavedFPFeatures(*this);
+ CurFPFeatures = FPOptions(getLangOpts());
+ FpPragmaStack.CurrentValue = FPOptionsOverride();
+
if (addInstantiatedParametersToScope(Function, PatternDecl, Scope,
TemplateArgs))
return;
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