https://github.com/kuilpd created
https://github.com/llvm/llvm-project/pull/120965
Move the code that calculates BestWidth, BestType and BestPromotionType for an
enum to a separate function which can be called from outside of Sema.
>From ab8dcaef120233d0145508aaa4bf45eec22cadf1 Mon Sep 17 00:00:00 2001
From: Ilia Kuklin <ikuk...@accesssoftek.com>
Date: Mon, 23 Dec 2024 17:49:32 +0500
Subject: [PATCH] [clang][Sema] Move calculating enum width and type to a
separate function
---
clang/include/clang/Sema/Sema.h | 7 ++
clang/lib/Sema/SemaDecl.cpp | 158 ++++++++++++++++++--------------
2 files changed, 94 insertions(+), 71 deletions(-)
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 5ee7ea48cc983c..51a1721fb74f01 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -3987,6 +3987,13 @@ class Sema final : public SemaBase {
SourceLocation IdLoc, IdentifierInfo *Id,
const ParsedAttributesView &Attrs,
SourceLocation EqualLoc, Expr *Val);
+
+ bool ComputeBestEnumProperties(ASTContext &Context, EnumDecl *Enum,
+ bool isCpp, bool isPacked,
+ unsigned NumNegativeBits,
+ unsigned NumPositiveBits, unsigned &BestWidth,
+ QualType &BestType,
+ QualType &BestPromotionType);
void ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
Decl *EnumDecl, ArrayRef<Decl *> Elements, Scope *S,
const ParsedAttributesView &Attr);
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 4001c4d263f1d2..79cbfe3116b26b 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -20008,6 +20008,87 @@ bool Sema::IsValueInFlagEnum(const EnumDecl *ED, const
llvm::APInt &Val,
return !(FlagMask & Val) || (AllowMask && !(FlagMask & ~Val));
}
+bool Sema::ComputeBestEnumProperties(ASTContext &Context, EnumDecl *Enum,
+ bool is_cpp, bool isPacked,
+ unsigned NumNegativeBits,
+ unsigned NumPositiveBits,
+ unsigned &BestWidth, QualType &BestType,
+ QualType &BestPromotionType) {
+ unsigned IntWidth = Context.getTargetInfo().getIntWidth();
+ unsigned CharWidth = Context.getTargetInfo().getCharWidth();
+ unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
+ bool enum_too_large = false;
+ if (NumNegativeBits) {
+ // If there is a negative value, figure out the smallest integer type (of
+ // int/long/longlong) that fits.
+ // If it's packed, check also if it fits a char or a short.
+ if (isPacked && NumNegativeBits <= CharWidth &&
+ NumPositiveBits < CharWidth) {
+ BestType = Context.SignedCharTy;
+ BestWidth = CharWidth;
+ } else if (isPacked && NumNegativeBits <= ShortWidth &&
+ NumPositiveBits < ShortWidth) {
+ BestType = Context.ShortTy;
+ BestWidth = ShortWidth;
+ } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
+ BestType = Context.IntTy;
+ BestWidth = IntWidth;
+ } else {
+ BestWidth = Context.getTargetInfo().getLongWidth();
+
+ if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
+ BestType = Context.LongTy;
+ } else {
+ BestWidth = Context.getTargetInfo().getLongLongWidth();
+
+ if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
+ enum_too_large = true;
+ BestType = Context.LongLongTy;
+ }
+ }
+ BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
+ } else {
+ // If there is no negative value, figure out the smallest type that fits
+ // all of the enumerator values.
+ // If it's packed, check also if it fits a char or a short.
+ if (isPacked && NumPositiveBits <= CharWidth) {
+ BestType = Context.UnsignedCharTy;
+ BestPromotionType = Context.IntTy;
+ BestWidth = CharWidth;
+ } else if (isPacked && NumPositiveBits <= ShortWidth) {
+ BestType = Context.UnsignedShortTy;
+ BestPromotionType = Context.IntTy;
+ BestWidth = ShortWidth;
+ } else if (NumPositiveBits <= IntWidth) {
+ BestType = Context.UnsignedIntTy;
+ BestWidth = IntWidth;
+ BestPromotionType = (NumPositiveBits == BestWidth || !is_cpp)
+ ? Context.UnsignedIntTy
+ : Context.IntTy;
+ } else if (NumPositiveBits <=
+ (BestWidth = Context.getTargetInfo().getLongWidth())) {
+ BestType = Context.UnsignedLongTy;
+ BestPromotionType = (NumPositiveBits == BestWidth || !is_cpp)
+ ? Context.UnsignedLongTy
+ : Context.LongTy;
+ } else {
+ BestWidth = Context.getTargetInfo().getLongLongWidth();
+ if (NumPositiveBits > BestWidth) {
+ // This can happen with bit-precise integer types, but those are not
+ // allowed as the type for an enumerator per C23 6.7.2.2p4 and p12.
+ // FIXME: GCC uses __int128_t and __uint128_t for cases that fit within
+ // a 128-bit integer, we should consider doing the same.
+ enum_too_large = true;
+ }
+ BestType = Context.UnsignedLongLongTy;
+ BestPromotionType = (NumPositiveBits == BestWidth || !is_cpp)
+ ? Context.UnsignedLongLongTy
+ : Context.LongLongTy;
+ }
+ }
+ return enum_too_large;
+}
+
void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
Decl *EnumDeclX, ArrayRef<Decl *> Elements, Scope *S,
const ParsedAttributesView &Attrs) {
@@ -20030,10 +20111,6 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc,
SourceRange BraceRange,
return;
}
- unsigned IntWidth = Context.getTargetInfo().getIntWidth();
- unsigned CharWidth = Context.getTargetInfo().getCharWidth();
- unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
-
// Verify that all the values are okay, compute the size of the values, and
// reverse the list.
unsigned NumNegativeBits = 0;
@@ -20099,73 +20176,12 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc,
SourceRange BraceRange,
BestPromotionType = BestType;
BestWidth = Context.getIntWidth(BestType);
- }
- else if (NumNegativeBits) {
- // If there is a negative value, figure out the smallest integer type (of
- // int/long/longlong) that fits.
- // If it's packed, check also if it fits a char or a short.
- if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth)
{
- BestType = Context.SignedCharTy;
- BestWidth = CharWidth;
- } else if (Packed && NumNegativeBits <= ShortWidth &&
- NumPositiveBits < ShortWidth) {
- BestType = Context.ShortTy;
- BestWidth = ShortWidth;
- } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
- BestType = Context.IntTy;
- BestWidth = IntWidth;
- } else {
- BestWidth = Context.getTargetInfo().getLongWidth();
-
- if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
- BestType = Context.LongTy;
- } else {
- BestWidth = Context.getTargetInfo().getLongLongWidth();
-
- if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
- Diag(Enum->getLocation(), diag::ext_enum_too_large);
- BestType = Context.LongLongTy;
- }
- }
- BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
} else {
- // If there is no negative value, figure out the smallest type that fits
- // all of the enumerator values.
- // If it's packed, check also if it fits a char or a short.
- if (Packed && NumPositiveBits <= CharWidth) {
- BestType = Context.UnsignedCharTy;
- BestPromotionType = Context.IntTy;
- BestWidth = CharWidth;
- } else if (Packed && NumPositiveBits <= ShortWidth) {
- BestType = Context.UnsignedShortTy;
- BestPromotionType = Context.IntTy;
- BestWidth = ShortWidth;
- } else if (NumPositiveBits <= IntWidth) {
- BestType = Context.UnsignedIntTy;
- BestWidth = IntWidth;
- BestPromotionType
- = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
- ? Context.UnsignedIntTy : Context.IntTy;
- } else if (NumPositiveBits <=
- (BestWidth = Context.getTargetInfo().getLongWidth())) {
- BestType = Context.UnsignedLongTy;
- BestPromotionType
- = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
- ? Context.UnsignedLongTy : Context.LongTy;
- } else {
- BestWidth = Context.getTargetInfo().getLongLongWidth();
- if (NumPositiveBits > BestWidth) {
- // This can happen with bit-precise integer types, but those are not
- // allowed as the type for an enumerator per C23 6.7.2.2p4 and p12.
- // FIXME: GCC uses __int128_t and __uint128_t for cases that fit within
- // a 128-bit integer, we should consider doing the same.
- Diag(Enum->getLocation(), diag::ext_enum_too_large);
- }
- BestType = Context.UnsignedLongLongTy;
- BestPromotionType
- = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
- ? Context.UnsignedLongLongTy : Context.LongLongTy;
- }
+ bool enum_too_large = ComputeBestEnumProperties(
+ Context, Enum, getLangOpts().CPlusPlus, Packed, NumNegativeBits,
+ NumPositiveBits, BestWidth, BestType, BestPromotionType);
+ if (enum_too_large)
+ Diag(Enum->getLocation(), diag::ext_enum_too_large);
}
// Loop over all of the enumerator constants, changing their types to match
@@ -20197,7 +20213,7 @@ void Sema::ActOnEnumBody(SourceLocation EnumLoc,
SourceRange BraceRange,
// int; or,
// - the enumerated type
NewTy = Context.IntTy;
- NewWidth = IntWidth;
+ NewWidth = Context.getTargetInfo().getIntWidth();
NewSign = true;
} else if (ECD->getType() == BestType) {
// Already the right type!
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