kpn created this revision.
kpn added reviewers: rsmith, craig.topper, hfinkel.
Herald added a subscriber: cfe-commits.
We have in place support for parsing #pragma FENV_ACCESS, but that information
is then discarded with a warning to the user that we don't support it.
This patch gets us one step closer by getting the info down into the AST.
Repository:
rC Clang
https://reviews.llvm.org/D49865
Files:
include/clang/AST/Expr.h
include/clang/Basic/LangOptions.h
include/clang/Basic/TokenKinds.def
include/clang/Parse/Parser.h
include/clang/Sema/Sema.h
lib/Parse/ParsePragma.cpp
lib/Parse/ParseStmt.cpp
lib/Parse/Parser.cpp
lib/Sema/SemaAttr.cpp
Index: lib/Sema/SemaAttr.cpp
===================================================================
--- lib/Sema/SemaAttr.cpp
+++ lib/Sema/SemaAttr.cpp
@@ -773,6 +773,18 @@
}
}
+void Sema::ActOnPragmaFENVAccess(LangOptions::FENVAccessModeKind FPC) {
+ switch (FPC) {
+ case LangOptions::FEA_On:
+ FPFeatures.setAllowFENVAccess();
+ break;
+ case LangOptions::FEA_Off:
+ FPFeatures.setDisallowFENVAccess();
+ break;
+ }
+}
+
+
void Sema::PushNamespaceVisibilityAttr(const VisibilityAttr *Attr,
SourceLocation Loc) {
// Visibility calculations will consider the namespace's visibility.
Index: lib/Parse/Parser.cpp
===================================================================
--- lib/Parse/Parser.cpp
+++ lib/Parse/Parser.cpp
@@ -674,6 +674,9 @@
case tok::annot_pragma_fp_contract:
HandlePragmaFPContract();
return nullptr;
+ case tok::annot_pragma_fenv_access:
+ HandlePragmaFENVAccess();
+ return nullptr;
case tok::annot_pragma_fp:
HandlePragmaFP();
break;
Index: lib/Parse/ParseStmt.cpp
===================================================================
--- lib/Parse/ParseStmt.cpp
+++ lib/Parse/ParseStmt.cpp
@@ -348,6 +348,12 @@
ConsumeAnnotationToken();
return StmtError();
+ case tok::annot_pragma_fenv_access:
+ ProhibitAttributes(Attrs);
+ //Diag(Tok, diag::err_pragma_fp_scope);
+ HandlePragmaFENVAccess();
+ return StmtEmpty();
+
case tok::annot_pragma_opencl_extension:
ProhibitAttributes(Attrs);
HandlePragmaOpenCLExtension();
@@ -914,6 +920,9 @@
case tok::annot_pragma_fp:
HandlePragmaFP();
break;
+ case tok::annot_pragma_fenv_access:
+ HandlePragmaFENVAccess();
+ break;
case tok::annot_pragma_ms_pointers_to_members:
HandlePragmaMSPointersToMembers();
break;
Index: lib/Parse/ParsePragma.cpp
===================================================================
--- lib/Parse/ParsePragma.cpp
+++ lib/Parse/ParsePragma.cpp
@@ -106,8 +106,19 @@
tok::OnOffSwitch OOS;
if (PP.LexOnOffSwitch(OOS))
return;
- if (OOS == tok::OOS_ON)
+ if (OOS == tok::OOS_ON) {
PP.Diag(Tok, diag::warn_stdc_fenv_access_not_supported);
+
+ MutableArrayRef<Token> Toks(PP.getPreprocessorAllocator().Allocate<Token>(1),
+ 1);
+ Toks[0].startToken();
+ Toks[0].setKind(tok::annot_pragma_fenv_access);
+ Toks[0].setLocation(Tok.getLocation());
+ Toks[0].setAnnotationEndLoc(Tok.getLocation());
+ Toks[0].setAnnotationValue(reinterpret_cast<void*>(
+ static_cast<uintptr_t>(OOS)));
+ PP.EnterTokenStream(Toks, /*DisableMacroExpansion=*/true);
+ }
}
};
@@ -591,6 +602,32 @@
ConsumeAnnotationToken();
}
+void Parser::HandlePragmaFENVAccess() {
+ assert(Tok.is(tok::annot_pragma_fenv_access));
+ tok::OnOffSwitch OOS =
+ static_cast<tok::OnOffSwitch>(
+ reinterpret_cast<uintptr_t>(Tok.getAnnotationValue()));
+
+ LangOptions::FENVAccessModeKind FPC;
+ switch (OOS) {
+ case tok::OOS_ON:
+ FPC = LangOptions::FEA_On;
+ break;
+ case tok::OOS_OFF:
+ FPC = LangOptions::FEA_Off;
+ break;
+#if NOTYET // FIXME: Add this cli option when it makes sense.
+ case tok::OOS_DEFAULT:
+ FPC = getLangOpts().getDefaultFENVAccessMode();
+ break;
+#endif
+ }
+
+ Actions.ActOnPragmaFENVAccess(FPC);
+ ConsumeAnnotationToken();
+}
+
+
StmtResult Parser::HandlePragmaCaptured()
{
assert(Tok.is(tok::annot_pragma_captured));
Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -8433,6 +8433,10 @@
/// \#pragma clang fp contract
void ActOnPragmaFPContract(LangOptions::FPContractModeKind FPC);
+ /// ActOnPragmaFENVAccess - Called on well formed
+ /// \#pragma STDC FENV_ACCESS
+ void ActOnPragmaFENVAccess(LangOptions::FENVAccessModeKind FPC);
+
/// AddAlignmentAttributesForRecord - Adds any needed alignment attributes to
/// a the record decl, to handle '\#pragma pack' and '\#pragma options align'.
void AddAlignmentAttributesForRecord(RecordDecl *RD);
Index: include/clang/Parse/Parser.h
===================================================================
--- include/clang/Parse/Parser.h
+++ include/clang/Parse/Parser.h
@@ -668,6 +668,10 @@
void HandlePragmaFPContract();
/// Handle the annotation token produced for
+ /// #pragma STDC FENV_ACCESS...
+ void HandlePragmaFENVAccess();
+
+ /// \brief Handle the annotation token produced for
/// #pragma clang fp ...
void HandlePragmaFP();
Index: include/clang/Basic/TokenKinds.def
===================================================================
--- include/clang/Basic/TokenKinds.def
+++ include/clang/Basic/TokenKinds.def
@@ -779,6 +779,11 @@
// handles them.
ANNOTATION(pragma_fp_contract)
+// Annotation for #pragma STDC FENV_ACCESS
+// The lexer produces these so that they only take effect when the parser
+// handles them.
+ANNOTATION(pragma_fenv_access)
+
// Annotation for #pragma pointers_to_members...
// The lexer produces these so that they only take effect when the parser
// handles them.
Index: include/clang/Basic/LangOptions.h
===================================================================
--- include/clang/Basic/LangOptions.h
+++ include/clang/Basic/LangOptions.h
@@ -137,6 +137,14 @@
FPC_Fast
};
+ // TODO: merge FENVAccessModeKind and FPContractModeKind
+ enum FENVAccessModeKind {
+ FEA_Off,
+
+ FEA_On
+ };
+
+
public:
/// Set of enabled sanitizers.
SanitizerSet Sanitize;
@@ -289,12 +297,24 @@
void setDisallowFPContract() { fp_contract = LangOptions::FPC_Off; }
+ bool allowFENVAccess() const {
+ return fenv_access == LangOptions::FEA_On;
+ }
+
+ void setAllowFENVAccess() {
+ fenv_access = LangOptions::FEA_On;
+ }
+
+ void setDisallowFENVAccess() { fenv_access = LangOptions::FEA_Off; }
+
/// Used to serialize this.
- unsigned getInt() const { return fp_contract; }
+ unsigned getInt() const { return fp_contract | (fenv_access << 2); }
private:
- /// Adjust BinaryOperator::FPFeatures to match the bit-field size of this.
+ /// Adjust BinaryOperator::FPFeatures to match the total bit-field size
+ /// of these two.
unsigned fp_contract : 2;
+ unsigned fenv_access : 1;
};
/// Describes the kind of translation unit being processed.
Index: include/clang/AST/Expr.h
===================================================================
--- include/clang/AST/Expr.h
+++ include/clang/AST/Expr.h
@@ -3083,7 +3083,7 @@
// This is only meaningful for operations on floating point types and 0
// otherwise.
- unsigned FPFeatures : 2;
+ unsigned FPFeatures : 3;
SourceLocation OpLoc;
enum { LHS, RHS, END_EXPR };
@@ -3254,6 +3254,12 @@
return FPOptions(FPFeatures).allowFPContractWithinStatement();
}
+ // Get the FENV_ACCESS status of this operator. Only meaningful for
+ // operations on floating point types.
+ bool isFENVAccessOn() const {
+ return FPOptions(FPFeatures).allowFENVAccess();
+ }
+
protected:
BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
ExprValueKind VK, ExprObjectKind OK,
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