[cfe-commits] r142844 - in /cfe/trunk: include/clang/AST/Expr.h lib/AST/ExprConstant.cpp test/SemaCXX/i-c-e-cxx.cpp
Richard Smith
richard at metafoo.co.uk
Mon Oct 24 16:26:18 PDT 2011
On Mon, October 24, 2011 22:52, David Dean wrote:
> My bots are hitting an assert after this change:
Thanks for letting me know. Reverted in r142872. I've reproduced this. The
root cause looks to be that we're missing an lvalue-to-rvalue conversion for
the LHS of '->' in some cases.
> Assertion failed: (E->isRValue() &&
> E->getType()->hasPointerRepresentation()), function EvaluatePointer, file
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-gcc42-RA/llvm/tools/clang/lib/AST/ExprConstant.cpp, line 778.
> 0 clang 0x0000000101af0eb2
> llvm::SmallVectorTemplateBase<llvm_regmatch_t, false>::grow(unsigned long) +
> 338
> 1 clang 0x0000000101af1e33
> llvm::SmallVectorTemplateBase<llvm_regmatch_t, false>::grow(unsigned long) +
> 4307
> 2 libSystem.B.dylib 0x00007fff8573b67a _sigtramp + 26
> 3 libSystem.B.dylib 0x0000000000000004 _sigtramp + 2056014244
> 4 clang 0x0000000101af1332
> llvm::SmallVectorTemplateBase<llvm_regmatch_t, false>::grow(unsigned long) +
> 1490
> 5 clang 0x0000000100bbd9a2
> clang::Expr::Classification::getModifiable() const + 85250
> 6 clang 0x0000000100bbf4e3
> clang::Expr::Classification::getModifiable() const + 92227
> 7 clang 0x0000000100baffea
> clang::Expr::Classification::getModifiable() const + 29514
> 8 clang 0x0000000100bbe6b4
> clang::Expr::Classification::getModifiable() const + 88596
> 9 clang 0x0000000100bbcd2f
> clang::Expr::Classification::getModifiable() const + 82063
> 10 clang 0x0000000100bbd9e6
> clang::Expr::Classification::getModifiable() const + 85318
> 11 clang 0x0000000100bbfe25
> clang::Expr::Classification::getModifiable() const + 94597
> 12 clang 0x0000000100baca0d
> clang::Expr::Classification::getModifiable() const + 15725
> 13 clang 0x0000000100bb4121
> clang::Expr::Classification::getModifiable() const + 46209
> 14 clang 0x0000000100bb5fc0
> clang::Expr::Classification::getModifiable() const + 54048
> 15 clang 0x0000000100bb6415
> clang::Expr::Classification::getModifiable() const + 55157
> 16 clang 0x00000001008dbf82 llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 87314
> 17 clang 0x00000001008d5b4d llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 61661
> 18 clang 0x00000001008d842c llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 72124
> 19 clang 0x00000001008d5e1f llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 62383
> 20 clang 0x00000001008d58ee llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 61054
> 21 clang 0x00000001008dc099 llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 87593
> 22 clang 0x00000001008dce30 llvm::DenseMap<clang::Stmt const*,
> clang::CFGBlock const*, llvm::DenseMapInfo<clang::Stmt const*>,
> llvm::DenseMapInfo<clang::CFGBlock const*> >::grow(unsigned int) + 91072
> 23 clang 0x00000001008c0be9 llvm::DenseMap<clang::ento::SymbolData
> const*, clang::ento::SymbolReaper::SymbolStatus,
> llvm::DenseMapInfo<clang::ento::SymbolData const*>,
> llvm::DenseMapInfo<clang::ento::SymbolReaper::SymbolStatus> >::grow(unsigned
> int) + 3033 24 clang 0x00000001003b0016
> clang::Parser::ConsumeAnyToken() + 22310
> 25 clang 0x00000001003d86e8 clang::Expr**
> llvm::PointerUnion<clang::Expr*, clang::Expr**>::get<clang::Expr**>() const +
> 38152
> 26 clang 0x0000000100479e2d
> clang::CanQual<clang::ReferenceType>::CreateUnsafe(clang::QualType) + 127789
> 27 clang 0x0000000100732b4b
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 54219
> 28 clang 0x0000000100733657
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 57047
> 29 clang 0x0000000100733105
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 55685
> 30 clang 0x0000000100733657
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 57047
> 31 clang 0x0000000100733105
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 55685
> 32 clang 0x0000000100733657
> llvm::cast_retty<clang::TemplateSpecializationType,
> clang::CanQual<clang::Type> >::ret_type
> llvm::cast<clang::TemplateSpecializationType, clang::CanQual<clang::Type>
> >(clang::CanQual<clang::Type> const&) + 57047
> 33 clang 0x00000001003d890d clang::Expr**
> llvm::PointerUnion<clang::Expr*, clang::Expr**>::get<clang::Expr**>() const +
> 38701
> 34 clang 0x00000001003a8baf
> llvm::SmallVectorTemplateBase<clang::ParsedTemplateArgument,
> false>::grow(unsigned long) + 71839
> 35 clang 0x000000010032518b llvm::IRBuilder<true,
> llvm::ConstantFolder, llvm::IRBuilderDefaultInserter<true>
> >::CreateGEP(llvm::Value*, llvm::Value*, llvm::Twine const&) + 859
> 36 clang 0x00000001002ee24c llvm::ValueMapCallbackVH<llvm::Value
> const*, llvm::TrackingVH<llvm::Value>, llvm::ValueMapConfig<llvm::Value
> const*>, llvm::DenseMapInfo<llvm::TrackingVH<llvm::Value> >
> >::allUsesReplacedWith(llvm::Value*) + 4156
> 37 clang 0x0000000100030853 llvm::DenseMap<clang::IdentifierInfo
> const*, unsigned int, llvm::DenseMapInfo<clang::IdentifierInfo const*>,
> llvm::DenseMapInfo<unsigned int> >::grow(unsigned int) + 25475
> 38 clang 0x000000010000b645 llvm::raw_ostream::operator<<(char
> const*) + 1893 39 clang 0x0000000100002358
> 40 clang 0x000000010000a38e std::vector<std::string,
> std::allocator<std::string> >::operator=(std::vector<std::string,
> std::allocator<std::string> > const&) + 13774
> 41 clang 0x0000000100000c34
> Stack dump:
> 0. Program arguments:
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/host-compiler/bin/clang -cc1 -triple x86_64-apple-macosx10.6.6
> -emit-obj -disable-free -main-file-name CommandLine.cpp -pic-level 1
> -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2
> -target-linker-version 123.4 -coverage-file
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support/Release+Asserts/CommandLine.o -resource-dir
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/host-compiler/bin/../lib/clang/3.1 -dependency-file
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support/Release+Asserts/CommandLine.d.tmp -MP -MT
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support/Release+Asserts/CommandLine.o -MT
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support/Release+Asserts/CommandLine.d -D _DEBUG -D
> _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D
> __STDC_LIMIT_MACROS -I
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/include -I
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support -I
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/include -I
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/lib/Support -fmodule-cache-path
> /var/folders/K2/K2x7HyV8GZSimPbqHtjYKE+++TQ/-Tmp-/clang-module-cache -O3
> -Woverloaded-virtual -Wcast-qual -Wall -W -Wno-unused-parameter
> -Wwrite-strings -fconst-strings -fdeprecated-macro -fdebug-compilation-dir
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support -ferror-limit 19 -fmessage-length 0
> -stack-protector 1 -fblocks -fobjc-dispatch-method=mixed -fno-common
> -fdiagnostics-show-option -o
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/clang-build/lib/Support/Release+Asserts/CommandLine.o -x c++
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/lib/Support/CommandLine.cpp
> 1. <eof> parser at end of file
> 2.
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/include/llvm/ADT/StringMap.h:295:18: instantiating function
> definition 'find' 3.
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/include/llvm/ADT/StringMap.h:417:12: instantiating function
> definition 'StringMapConstIterator' 4.
> /Users/buildslave/zorg/buildbot/smooshlab/slave-0.8/build.clang-x86_64-darwin
> 10-RA/llvm/include/llvm/ADT/StringMap.h:447:8: instantiating function
> definition 'AdvancePastEmptyBuckets' clang: error: unable to execute command:
> Illegal instruction
> clang: error: clang frontend command failed due to signal 2 (use -v to see
> invocation) clang: note: diagnostic msg: Please submit a bug report to
> http://llvm.org/bugs/ and include command line arguments and all diagnostic
> information.
>
> llvm[1]: Compiling CrashRecoveryContext.cpp for Release+Asserts build
>
>
>
>
> On 24 Oct 2011, at 2:07 PM, Richard Smith wrote:
>
>
>> Author: rsmith
>> Date: Mon Oct 24 16:07:08 2011
>> New Revision: 142844
>>
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=142844&view=rev
>> Log:
>> Constant expression evaluation: evaluate lvalues as lvalues, and rvalues as
>> rvalues, as C++11 constant evaluation semantics require. DeclRefs referring
>> to references can now use the normal initialization-caching codepath, which
>> incidentally fixes a crash in cyclic initialization of references.
>>
>> Modified:
>> cfe/trunk/include/clang/AST/Expr.h cfe/trunk/lib/AST/ExprConstant.cpp
>> cfe/trunk/test/SemaCXX/i-c-e-cxx.cpp
>>
>> Modified: cfe/trunk/include/clang/AST/Expr.h
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/Expr.h?rev=
>> 142844&r1=142843&r2=142844&view=diff
>> ============================================================================
>> ==
>> --- cfe/trunk/include/clang/AST/Expr.h (original)
>> +++ cfe/trunk/include/clang/AST/Expr.h Mon Oct 24 16:07:08 2011
>> @@ -465,7 +465,8 @@
>> /// Evaluate - Return true if this is a constant which we can fold using
>> /// any crazy technique (that has nothing to do with language standards)
>> that /// we want to. If this function returns true, it returns the folded
>> constant - /// in Result.
>> + /// in Result. If this expression is a glvalue, an lvalue-to-rvalue
>> conversion + /// will be applied.
>> bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const;
>>
>> /// EvaluateAsBooleanCondition - Return true if this is a constant
>>
>>
>> Modified: cfe/trunk/lib/AST/ExprConstant.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ExprConstant.cpp?rev=
>> 142844&r1=142843&r2=142844&view=diff
>> ============================================================================
>> ==
>> --- cfe/trunk/lib/AST/ExprConstant.cpp (original)
>> +++ cfe/trunk/lib/AST/ExprConstant.cpp Mon Oct 24 16:07:08 2011
>> @@ -151,7 +151,7 @@
>> return true; }
>>
>>
>> -static bool EvalPointerValueAsBool(LValue& Value, bool& Result) {
>> +static bool EvalPointerValueAsBool(const LValue &Value, bool &Result) {
>> const Expr* Base = Value.Base;
>>
>> // A null base expression indicates a null pointer. These are always
>> @@ -183,40 +183,44 @@
>> return true; }
>>
>>
>> -static bool HandleConversionToBool(const Expr* E, bool& Result,
>> - EvalInfo &Info) {
>> - if (E->getType()->isIntegralOrEnumerationType()) {
>> - APSInt IntResult;
>> - if (!EvaluateInteger(E, IntResult, Info))
>> - return false;
>> - Result = IntResult != 0;
>> +static bool HandleConversionToBool(const APValue &Val, bool &Result) {
>> + switch (Val.getKind()) {
>> + case APValue::Uninitialized:
>> + return false;
>> + case APValue::Int:
>> + Result = Val.getInt().getBoolValue();
>> return true; - } else if (E->getType()->isRealFloatingType()) {
>> - APFloat FloatResult(0.0);
>> - if (!EvaluateFloat(E, FloatResult, Info))
>> - return false;
>> - Result = !FloatResult.isZero();
>> + case APValue::Float:
>> + Result = !Val.getFloat().isZero();
>> return true; - } else if (E->getType()->hasPointerRepresentation()) {
>> - LValue PointerResult;
>> - if (!EvaluatePointer(E, PointerResult, Info))
>> - return false;
>> - return EvalPointerValueAsBool(PointerResult, Result);
>> - } else if (E->getType()->isAnyComplexType()) {
>> - ComplexValue ComplexResult;
>> - if (!EvaluateComplex(E, ComplexResult, Info))
>> - return false;
>> - if (ComplexResult.isComplexFloat()) {
>> - Result = !ComplexResult.getComplexFloatReal().isZero() ||
>> - !ComplexResult.getComplexFloatImag().isZero();
>> - } else {
>> - Result = ComplexResult.getComplexIntReal().getBoolValue() ||
>> - ComplexResult.getComplexIntImag().getBoolValue();
>> - }
>> + case APValue::ComplexInt:
>> + Result = Val.getComplexIntReal().getBoolValue() ||
>> + Val.getComplexIntImag().getBoolValue();
>> return true; + case APValue::ComplexFloat:
>> + Result = !Val.getComplexFloatReal().isZero() ||
>> + !Val.getComplexFloatImag().isZero();
>> + return true;
>> + case APValue::LValue:
>> + {
>> + LValue PointerResult;
>> + PointerResult.setFrom(Val);
>> + return EvalPointerValueAsBool(PointerResult, Result);
>> + }
>> + case APValue::Vector:
>> + return false;
>> }
>>
>>
>> - return false;
>> + llvm_unreachable("unknown APValue kind");
>> +}
>> +
>> +static bool EvaluateAsBooleanCondition(const Expr *E, bool &Result,
>> + EvalInfo &Info) {
>> + assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool
>> condition"); + APValue Val;
>> + if (!Evaluate(Val, Info, E))
>> + return false;
>> + return HandleConversionToBool(Val, Result);
>> }
>>
>>
>> static APSInt HandleFloatToIntCast(QualType DestType, QualType SrcType, @@
>> -278,10 +282,11 @@
>>
>>
>> VD->setEvaluatingValue();
>>
>>
>> - // FIXME: If the initializer isn't a constant expression, propagate up
>> any - // diagnostic explaining why not.
>> Expr::EvalResult EResult;
>> - if (Init->Evaluate(EResult, Info.Ctx) && !EResult.HasSideEffects)
>> + EvalInfo InitInfo(Info.Ctx, EResult);
>> + // FIXME: The caller will need to know whether the value was a constant
>> + // expression. If not, we should propagate up a diagnostic.
>> + if (Evaluate(EResult.Val, InitInfo, Init))
>> VD->setEvaluatedValue(EResult.Val);
>> else VD->setEvaluatedValue(APValue());
>> @@ -294,6 +299,52 @@
>> return Quals.hasConst() && !Quals.hasVolatile(); }
>>
>>
>> +bool HandleLValueToRValueConversion(EvalInfo &Info, QualType Type,
>> + const LValue &LValue, APValue &RValue)
>> {
>> + const Expr *Base = LValue.Base;
>> +
>> + // FIXME: Indirection through a null pointer deserves a diagnostic.
>> + if (!Base)
>> + return false;
>> +
>> + // FIXME: Support accessing subobjects of objects of literal types. A
>> simple + // byte offset is insufficient for C++11 semantics: we need to
>> know how the + // reference was formed (which union member was named, for
>> instance). + // FIXME: Support subobjects of StringLiteral and
>> PredefinedExpr.
>> + if (!LValue.Offset.isZero())
>> + return false;
>> +
>> + if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) {
>> + // In C++, const, non-volatile integers initialized with ICEs are ICEs.
>> + // In C, they can also be folded, although they are not ICEs.
>> + // In C++0x, constexpr variables are constant expressions too.
>> + // We allow folding any const variable of literal type initialized with
>> + // a constant expression.
>> + const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl());
>> + if (VD && IsConstNonVolatile(VD->getType()) && Type->isLiteralType()) {
>> + APValue *V = EvaluateVarDeclInit(Info, VD);
>> + if (V && !V->isUninit()) {
>> + RValue = *V;
>> + return true;
>> + }
>> + }
>> + return false;
>> + }
>> +
>> + // FIXME: C++11: Support MaterializeTemporaryExpr in LValueExprEvaluator
>> and + // here.
>> +
>> + // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating
>> the + // initializer until now for such expressions. Such an expression
>> can't be + // an ICE in C, so this only matters for fold.
>> + if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Base))
>> {
>> + assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in
>> c++?"); + return Evaluate(RValue, Info, CLE->getInitializer());
>> + }
>> +
>> + return false;
>> +}
>> +
>> namespace { class HasSideEffect : public ConstStmtVisitor<HasSideEffect, bool>
>> {
>> @@ -454,7 +505,7 @@
>> return DerivedError(E);
>>
>> bool cond; - if (!HandleConversionToBool(E->getCond(), cond, Info))
>> + if (!EvaluateAsBooleanCondition(E->getCond(), cond, Info))
>> return DerivedError(E);
>>
>> return StmtVisitorTy::Visit(cond ? E->getTrueExpr() : E->getFalseExpr()); @@
>> -462,10 +513,10 @@
>>
>>
>> RetTy VisitConditionalOperator(const ConditionalOperator *E) {
>> bool BoolResult; - if (!HandleConversionToBool(E->getCond(), BoolResult,
>> Info))
>> + if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info))
>> return DerivedError(E);
>>
>> - Expr* EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr();
>> + Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr();
>> return StmtVisitorTy::Visit(EvalExpr); }
>>
>>
>> @@ -477,6 +528,9 @@
>> return DerivedSuccess(*value, E); }
>>
>>
>> + RetTy VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) {
>> + return StmtVisitorTy::Visit(E->getInitializer());
>> + }
>> RetTy VisitInitListExpr(const InitListExpr *E) {
>> if (Info.getLangOpts().CPlusPlus0x) { if (E->getNumInits() == 0) @@ -493,6
>> +547,28 @@
>> return DerivedValueInitialization(E); }
>>
>>
>> + RetTy VisitCastExpr(const CastExpr *E) {
>> + switch (E->getCastKind()) {
>> + default:
>> + break;
>> +
>> + case CK_NoOp:
>> + return StmtVisitorTy::Visit(E->getSubExpr());
>> +
>> + case CK_LValueToRValue: {
>> + LValue LVal;
>> + if (EvaluateLValue(E->getSubExpr(), LVal, Info)) {
>> + APValue RVal;
>> + if (HandleLValueToRValueConversion(Info, E->getType(), LVal, RVal))
>> + return DerivedSuccess(RVal, E);
>> + }
>> + break;
>> + }
>> + }
>> +
>> + return DerivedError(E);
>> + }
>> +
>> /// Visit a value which is evaluated, but whose value is ignored.
>> void VisitIgnoredValue(const Expr *E) { APValue Scratch;
>> @@ -505,6 +581,10 @@
>>
>>
>> //===----------------------------------------------------------------------
>> ===//
>> // LValue Evaluation
>> +//
>> +// This is used for evaluating lvalues (in C and C++), xvalues (in C++11),
>> +// function designators (in C), decl references to void objects (in C), and
>> +// temporaries (if building with -Wno-address-of-temporary).
>> //===----------------------------------------------------------------------=
>> ==//
>> namespace { class LValueExprEvaluator @@ -542,13 +622,13 @@
>> bool VisitCastExpr(const CastExpr *E) { switch (E->getCastKind()) { default:
>> - return false;
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>>
>>
>> - case CK_NoOp:
>> case CK_LValueBitCast: return Visit(E->getSubExpr());
>>
>> - // FIXME: Support CK_DerivedToBase and friends.
>> + // FIXME: Support CK_DerivedToBase and CK_UncheckedDerivedToBase.
>> + // Reuse PointerExprEvaluator::VisitCastExpr for these.
>> }
>> }
>>
>>
>> @@ -557,6 +637,11 @@
>> };
>> } // end anonymous namespace
>>
>>
>> +/// Evaluate an expression as an lvalue. This can be legitimately called
>> on +/// expressions which are not glvalues, in a few cases:
>> +/// * function designators in C,
>> +/// * "extern void" objects,
>> +/// * temporaries, if building with -Wno-address-of-temporary.
>> static bool EvaluateLValue(const Expr* E, LValue& Result, EvalInfo &Info) {
>> return LValueExprEvaluator(Info, Result).Visit(E); }
>> @@ -570,22 +655,24 @@
>> // Reference parameters can refer to anything even if they have an
>> // "initializer" in the form of a default argument.
>> if (!isa<ParmVarDecl>(VD)) { - // FIXME: Check whether VD might be
>> overridden! -
>> - // Check for recursive initializers of references.
>> - if (PrevDecl == VD)
>> - return Error(E);
>> - PrevDecl = VD;
>> - if (const Expr *Init = VD->getAnyInitializer())
>> - return Visit(Init);
>> + APValue *V = EvaluateVarDeclInit(Info, VD);
>> + if (V && !V->isUninit()) {
>> + assert(V->isLValue() && "reference init not glvalue");
>> + Result.Base = V->getLValueBase();
>> + Result.Offset = V->getLValueOffset();
>> + return true;
>> + }
>> }
>> }
>>
>>
>> - return ExprEvaluatorBaseTy::VisitDeclRefExpr(E);
>> + return Error(E);
>> }
>>
>>
>> bool LValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr
>> *E) {
>> + assert(!Info.getLangOpts().CPlusPlus && "lvalue compound literal in
>> c++?"); + // Defer visiting the literal until the lvalue-to-rvalue
>> conversion. We can + // only see this when folding in C, so there's no
>> standard to follow here. return Success(E); }
>>
>>
>> @@ -617,6 +704,10 @@
>> }
>>
>>
>> bool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr
>> *E) {
>> + // FIXME: Deal with vectors as array subscript bases.
>> + if (E->getBase()->getType()->isVectorType())
>> + return false;
>> +
>> if (!EvaluatePointer(E->getBase(), Result, Info)) return false;
>>
>> @@ -684,7 +775,7 @@
>> } // end anonymous namespace
>>
>>
>> static bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info)
>> {
>> - assert(E->getType()->hasPointerRepresentation());
>> + assert(E->isRValue() && E->getType()->hasPointerRepresentation());
>> return PointerExprEvaluator(Info, Result).Visit(E); }
>>
>>
>> @@ -740,7 +831,6 @@
>> default:
>> break;
>>
>> - case CK_NoOp:
>> case CK_BitCast: case CK_CPointerToObjCPointerCast: case
>> CK_BlockPointerToObjCPointerCast:
>> @@ -810,7 +900,7 @@
>> return EvaluateLValue(SubExpr, Result, Info); }
>>
>>
>> - return false;
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>> }
>>
>>
>> bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { @@ -852,7
>> +942,6 @@
>> bool VisitUnaryReal(const UnaryOperator *E) { return Visit(E->getSubExpr());
>> }
>> bool VisitCastExpr(const CastExpr* E); - bool
>> VisitCompoundLiteralExpr(const CompoundLiteralExpr *E);
>> bool VisitInitListExpr(const InitListExpr *E); bool VisitUnaryImag(const
>> UnaryOperator *E);
>> // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div,
>> @@ -864,8 +953,7 @@
>> } // end anonymous namespace
>>
>>
>> static bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info)
>> {
>> - if (!E->getType()->isVectorType())
>> - return false;
>> + assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector
>> rvalue"); return VectorExprEvaluator(Info, Result).Visit(E); }
>>
>>
>> @@ -927,20 +1015,12 @@
>> }
>> return Success(Elts, E); }
>> - case CK_LValueToRValue:
>> - case CK_NoOp:
>> - return Visit(SE);
>> default:
>> - return Error(E);
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>> }
>> }
>>
>>
>> bool -VectorExprEvaluator::VisitCompoundLiteralExpr(const
>> CompoundLiteralExpr *E) {
>> - return Visit(E->getInitializer());
>> -}
>> -
>> -bool
>> VectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) {
>> const VectorType *VT = E->getType()->castAs<VectorType>(); unsigned NumInits
>> = E->getNumInits();
>> @@ -1022,6 +1102,10 @@
>>
>>
>> //===----------------------------------------------------------------------
>> ===//
>> // Integer Evaluation
>> +//
>> +// As a GNU extension, we support casting pointers to sufficiently-wide
>> integer +// types and back in constant folding. Integer values are thus
>> represented +// either as an integer-valued APValue, or as an lvalue-valued
>> APValue.
>> //===----------------------------------------------------------------------=
>> ==//
>>
>>
>> namespace { @@ -1105,8 +1189,7 @@
>> }
>> bool VisitMemberExpr(const MemberExpr *E) { if (CheckReferencedDecl(E,
>> E->getMemberDecl())) {
>> - // Conservatively assume a MemberExpr will have side-effects
>> - Info.EvalStatus.HasSideEffects = true;
>> + VisitIgnoredValue(E->getBase());
>> return true; }
>>
>>
>> @@ -1161,14 +1244,20 @@
>> };
>> } // end anonymous namespace
>>
>>
>> +/// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed
>> expression, and +/// produce either the integer value or a pointer.
>> +///
>> +/// GCC has a heinous extension which folds casts between pointer types and
>> +/// pointer-sized integral types. We support this by allowing the
>> evaluation of +/// an integer rvalue to produce a pointer (represented as an
>> lvalue) instead. +/// Some simple arithmetic on such values is supported
>> (they are treated much
>> +/// like char*).
>> static bool EvaluateIntegerOrLValue(const Expr* E, APValue &Result, EvalInfo
>> &Info) {
>> - assert(E->getType()->isIntegralOrEnumerationType());
>> + assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType());
>> return IntExprEvaluator(Info, Result).Visit(E); }
>>
>>
>> static bool EvaluateInteger(const Expr* E, APSInt &Result, EvalInfo &Info)
>> {
>> - assert(E->getType()->isIntegralOrEnumerationType());
>> -
>> APValue Val;
>> if (!EvaluateIntegerOrLValue(E, Val, Info) || !Val.isInt()) return false; @@
>> -1197,18 +1286,6 @@
>> return Success(Val, E); }
>> }
>> -
>> - // In C++, const, non-volatile integers initialized with ICEs are ICEs.
>> - // In C, they can also be folded, although they are not ICEs.
>> - if (IsConstNonVolatile(E->getType())) {
>> - if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
>> - APValue *V = EvaluateVarDeclInit(Info, VD);
>> - if (V && V->isInt())
>> - return Success(V->getInt(), E);
>> - }
>> - }
>> -
>> - // Otherwise, random variable references are not constants.
>> return false; }
>>
>>
>> @@ -1411,6 +1488,9 @@
>> }
>>
>>
>> bool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { + if
>> (E->isAssignmentOp())
>> + return Error(E->getOperatorLoc(), diag::note_invalid_subexpr_in_ice,
>> E);
>> +
>> if (E->getOpcode() == BO_Comma) { VisitIgnoredValue(E->getLHS());
>> return Visit(E->getRHS()); @@ -1421,20 +1501,20 @@
>> // necessarily integral
>> bool lhsResult, rhsResult;
>>
>> - if (HandleConversionToBool(E->getLHS(), lhsResult, Info)) {
>> + if (EvaluateAsBooleanCondition(E->getLHS(), lhsResult, Info)) {
>> // We were able to evaluate the LHS, see if we can get away with not
>> // evaluating the RHS: 0 && X -> 0, 1 || X -> 1
>> if (lhsResult == (E->getOpcode() == BO_LOr)) return Success(lhsResult, E);
>>
>> - if (HandleConversionToBool(E->getRHS(), rhsResult, Info)) {
>> + if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) {
>> if (E->getOpcode() == BO_LOr) return Success(lhsResult || rhsResult, E); else
>> return Success(lhsResult && rhsResult, E); }
>> } else {
>> - if (HandleConversionToBool(E->getRHS(), rhsResult, Info)) {
>> + if (EvaluateAsBooleanCondition(E->getRHS(), rhsResult, Info)) {
>> // We can't evaluate the LHS; however, sometimes the result
>> // is determined by the RHS: X && 0 -> 0, X || 1 -> 1.
>> if (rhsResult == (E->getOpcode() == BO_LOr) || @@ -1590,58 +1670,60 @@
>> }
>>
>>
>> // The LHS of a constant expr is always evaluated and needed.
>> - if (!Visit(E->getLHS()))
>> + APValue LHSVal;
>> + if (!EvaluateIntegerOrLValue(E->getLHS(), LHSVal, Info))
>> return false; // error in subexpression.
>>
>> - APValue RHSVal;
>> - if (!EvaluateIntegerOrLValue(E->getRHS(), RHSVal, Info))
>> + if (!Visit(E->getRHS()))
>> return false; + APValue &RHSVal = Result;
>>
>>
>> // Handle cases like (unsigned long)&a + 4.
>> - if (E->isAdditiveOp() && Result.isLValue() && RHSVal.isInt()) {
>> - CharUnits Offset = Result.getLValueOffset();
>> + if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) {
>> + CharUnits Offset = LHSVal.getLValueOffset();
>> CharUnits AdditionalOffset = CharUnits::fromQuantity(
>> RHSVal.getInt().getZExtValue());
>> if (E->getOpcode() == BO_Add) Offset += AdditionalOffset;
>> else Offset -= AdditionalOffset;
>> - Result = APValue(Result.getLValueBase(), Offset);
>> + Result = APValue(LHSVal.getLValueBase(), Offset);
>> return true; }
>>
>>
>> // Handle cases like 4 + (unsigned long)&a
>> if (E->getOpcode() == BO_Add && - RHSVal.isLValue() && Result.isInt())
>> {
>> + RHSVal.isLValue() && LHSVal.isInt()) {
>> CharUnits Offset = RHSVal.getLValueOffset();
>> - Offset += CharUnits::fromQuantity(Result.getInt().getZExtValue());
>> + Offset += CharUnits::fromQuantity(LHSVal.getInt().getZExtValue());
>> Result = APValue(RHSVal.getLValueBase(), Offset);
>> return true; }
>>
>>
>> // All the following cases expect both operands to be an integer
>> - if (!Result.isInt() || !RHSVal.isInt())
>> + if (!LHSVal.isInt() || !RHSVal.isInt())
>> return false;
>>
>> - APSInt& RHS = RHSVal.getInt();
>> + APSInt &LHS = LHSVal.getInt();
>> + APSInt &RHS = RHSVal.getInt();
>>
>>
>> switch (E->getOpcode()) { default:
>> return Error(E->getOperatorLoc(), diag::note_invalid_subexpr_in_ice, E); -
>> case BO_Mul: return Success(Result.getInt() * RHS, E); - case BO_Add:
>> return Success(Result.getInt() + RHS, E); - case BO_Sub: return
>> Success(Result.getInt() - RHS, E);
>> - case BO_And: return Success(Result.getInt() & RHS, E);
>> - case BO_Xor: return Success(Result.getInt() ^ RHS, E);
>> - case BO_Or: return Success(Result.getInt() | RHS, E);
>> + case BO_Mul: return Success(LHS * RHS, E);
>> + case BO_Add: return Success(LHS + RHS, E);
>> + case BO_Sub: return Success(LHS - RHS, E);
>> + case BO_And: return Success(LHS & RHS, E);
>> + case BO_Xor: return Success(LHS ^ RHS, E);
>> + case BO_Or: return Success(LHS | RHS, E);
>> case BO_Div: if (RHS == 0) return Error(E->getOperatorLoc(),
>> diag::note_expr_divide_by_zero, E);
>> - return Success(Result.getInt() / RHS, E);
>> + return Success(LHS / RHS, E);
>> case BO_Rem: if (RHS == 0) return Error(E->getOperatorLoc(),
>> diag::note_expr_divide_by_zero, E);
>> - return Success(Result.getInt() % RHS, E);
>> + return Success(LHS % RHS, E);
>> case BO_Shl: { // During constant-folding, a negative shift is an opposite
>> shift. if (RHS.isSigned() && RHS.isNegative()) { @@ -1651,8 +1733,8 @@
>>
>>
>> shift_left:
>> unsigned SA - = (unsigned)
>> RHS.getLimitedValue(Result.getInt().getBitWidth()-1);
>> - return Success(Result.getInt() << SA, E);
>> + = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1);
>> + return Success(LHS << SA, E);
>> }
>> case BO_Shr: { // During constant-folding, a negative shift is an opposite
>> shift. @@ -1663,16 +1745,16 @@
>>
>>
>> shift_right:
>> unsigned SA = - (unsigned)
>> RHS.getLimitedValue(Result.getInt().getBitWidth()-1);
>> - return Success(Result.getInt() >> SA, E);
>> + (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1);
>> + return Success(LHS >> SA, E);
>> }
>>
>>
>> - case BO_LT: return Success(Result.getInt() < RHS, E);
>> - case BO_GT: return Success(Result.getInt() > RHS, E);
>> - case BO_LE: return Success(Result.getInt() <= RHS, E);
>> - case BO_GE: return Success(Result.getInt() >= RHS, E);
>> - case BO_EQ: return Success(Result.getInt() == RHS, E);
>> - case BO_NE: return Success(Result.getInt() != RHS, E);
>> + case BO_LT: return Success(LHS < RHS, E);
>> + case BO_GT: return Success(LHS > RHS, E);
>> + case BO_LE: return Success(LHS <= RHS, E);
>> + case BO_GE: return Success(LHS >= RHS, E);
>> + case BO_EQ: return Success(LHS == RHS, E);
>> + case BO_NE: return Success(LHS != RHS, E);
>> }
>> }
>>
>>
>> @@ -1833,7 +1915,7 @@
>> if (E->getOpcode() == UO_LNot) { // LNot's operand isn't necessarily an
>> integer, so we handle it specially. bool bres; - if
>> (!HandleConversionToBool(E->getSubExpr(), bres, Info))
>> + if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info))
>> return false; return Success(!bres, E); }
>> @@ -1918,7 +2000,7 @@
>>
>>
>> case CK_LValueToRValue: case CK_NoOp: - return Visit(E->getSubExpr());
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>>
>>
>> case CK_MemberPointerToBoolean: case CK_PointerToBoolean: @@ -1927,7 +2009,7
>> @@
>> case CK_FloatingComplexToBoolean: case CK_IntegralComplexToBoolean: { bool
>> BoolResult;
>> - if (!HandleConversionToBool(SubExpr, BoolResult, Info))
>> + if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info))
>> return false; return Success(BoolResult, E); }
>> @@ -2050,15 +2132,13 @@
>> bool VisitUnaryReal(const UnaryOperator *E); bool VisitUnaryImag(const
>> UnaryOperator *E);
>>
>>
>> - bool VisitDeclRefExpr(const DeclRefExpr *E);
>> -
>> // FIXME: Missing: array subscript of vector, member of vector,
>> // ImplicitValueInitExpr
>> };
>> } // end anonymous namespace
>>
>>
>> static bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) {
>> - assert(E->getType()->isRealFloatingType());
>> + assert(E->isRValue() && E->getType()->isRealFloatingType());
>> return FloatExprEvaluator(Info, Result).Visit(E); }
>>
>>
>> @@ -2141,21 +2221,6 @@
>> }
>> }
>>
>>
>> -bool FloatExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) {
>> - if (ExprEvaluatorBaseTy::VisitDeclRefExpr(E))
>> - return true;
>> -
>> - const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl());
>> - if (VD && IsConstNonVolatile(VD->getType())) {
>> - APValue *V = EvaluateVarDeclInit(Info, VD);
>> - if (V && V->isFloat()) {
>> - Result = V->getFloat();
>> - return true;
>> - }
>> - }
>> - return false;
>> -}
>> -
>> bool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { if
>> (E->getSubExpr()->getType()->isAnyComplexType()) {
>> ComplexValue CV;
>> @@ -2245,11 +2310,7 @@
>>
>>
>> switch (E->getCastKind()) { default:
>> - return false;
>> -
>> - case CK_LValueToRValue:
>> - case CK_NoOp:
>> - return Visit(SubExpr);
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>>
>>
>> case CK_IntegralToFloating: { APSInt IntResult;
>> @@ -2317,7 +2378,7 @@
>>
>>
>> static bool EvaluateComplex(const Expr *E, ComplexValue &Result, EvalInfo
>> &Info) {
>> - assert(E->getType()->isAnyComplexType());
>> + assert(E->isRValue() && E->getType()->isAnyComplexType());
>> return ComplexExprEvaluator(Info, Result).Visit(E); }
>>
>>
>> @@ -2390,7 +2451,7 @@
>>
>>
>> case CK_LValueToRValue: case CK_NoOp: - return Visit(E->getSubExpr());
>> + return ExprEvaluatorBaseTy::VisitCastExpr(E);
>>
>>
>> case CK_Dependent: case CK_GetObjCProperty: @@ -2634,27 +2695,28 @@
>> //===----------------------------------------------------------------------=
>> ==//
>>
>>
>> static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { - if
>> (E->getType()->isVectorType()) {
>> + // In C, function designators are not lvalues, but we evaluate them as if
>> they + // are.
>> + if (E->isGLValue() || E->getType()->isFunctionType()) {
>> + LValue LV;
>> + if (!EvaluateLValue(E, LV, Info))
>> + return false;
>> + LV.moveInto(Result);
>> + } else if (E->getType()->isVectorType()) {
>> if (!EvaluateVector(E, Result, Info)) return false; } else if
>> (E->getType()->isIntegralOrEnumerationType()) {
>> if (!IntExprEvaluator(Info, Result).Visit(E)) return false; - if
>> (Result.isLValue() &&
>> - !IsGlobalLValue(Result.getLValueBase()))
>> - return false;
>> } else if (E->getType()->hasPointerRepresentation()) {
>> LValue LV;
>> if (!EvaluatePointer(E, LV, Info)) return false; - if
>> (!IsGlobalLValue(LV.Base))
>> - return false;
>> LV.moveInto(Result);
>> } else if (E->getType()->isRealFloatingType()) {
>> llvm::APFloat F(0.0);
>> if (!EvaluateFloat(E, F, Info)) return false; -
>> Result = APValue(F);
>> } else if (E->getType()->isAnyComplexType()) {
>> ComplexValue C;
>> @@ -2670,25 +2732,43 @@
>> /// Evaluate - Return true if this is a constant which we can fold using
>> /// any crazy technique (that has nothing to do with language standards)
>> that /// we want to. If this function returns true, it returns the folded
>> constant -/// in Result.
>> +/// in Result. If this expression is a glvalue, an lvalue-to-rvalue
>> conversion +/// will be applied to the result.
>> bool Expr::Evaluate(EvalResult &Result, const ASTContext &Ctx) const {
>> EvalInfo Info(Ctx, Result);
>> - return ::Evaluate(Result.Val, Info, this);
>> +
>> + if (!::Evaluate(Result.Val, Info, this))
>> + return false;
>> +
>> + if (isGLValue()) {
>> + LValue LV;
>> + LV.setFrom(Result.Val);
>> + return HandleLValueToRValueConversion(Info, getType(), LV, Result.Val);
>> + } else if (Result.Val.isLValue()) {
>> + // FIXME: We don't allow expressions to fold to references to locals.
>> Code
>> + // which calls Evaluate() isn't ready for that yet. For instance, we
>> don't + // have any checking that the initializer of a pointer in C is an
>> address + // constant.
>> + if (!IsGlobalLValue(Result.Val.getLValueBase()))
>> + return false;
>> + }
>> +
>> + return true;
>> }
>>
>>
>> bool Expr::EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx)
>> const { - EvalStatus Scratch;
>> - EvalInfo Info(Ctx, Scratch);
>> -
>> - return HandleConversionToBool(this, Result, Info);
>> + EvalResult Scratch;
>> + return Evaluate(Scratch, Ctx) && HandleConversionToBool(Scratch.Val,
>> Result);
>> }
>>
>>
>> bool Expr::EvaluateAsInt(APSInt &Result, const ASTContext &Ctx) const { -
>> EvalStatus Scratch;
>> - EvalInfo Info(Ctx, Scratch);
>> -
>> - return EvaluateInteger(this, Result, Info) && !Scratch.HasSideEffects;
>> + EvalResult ExprResult;
>> + if (!Evaluate(ExprResult, Ctx) || ExprResult.HasSideEffects ||
>> + !ExprResult.Val.isInt())
>> + return false;
>> + Result = ExprResult.Val.getInt();
>> + return true;
>> }
>>
>>
>> bool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx)
>> const { @@ -3184,11 +3264,7 @@
>> if (Loc) *Loc = d.Loc; return false; }
>> - EvalResult EvalResult;
>> - if (!Evaluate(EvalResult, Ctx))
>> + if (!EvaluateAsInt(Result, Ctx))
>> llvm_unreachable("ICE cannot be evaluated!"); -
>> assert(!EvalResult.HasSideEffects && "ICE with side effects!"); -
>> assert(EvalResult.Val.isInt() && "ICE that isn't integer!"); - Result =
>> EvalResult.Val.getInt();
>> return true; }
>>
>>
>> Modified: cfe/trunk/test/SemaCXX/i-c-e-cxx.cpp
>> URL:
>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/i-c-e-cxx.cpp?re
>> v=142844&r1=142843&r2=142844&view=diff
>> ===========================================================================
>> ===
>> --- cfe/trunk/test/SemaCXX/i-c-e-cxx.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/i-c-e-cxx.cpp Mon Oct 24 16:07:08 2011
>> @@ -66,3 +66,6 @@
>> int arr[nonconst]; // expected-warning {{folded to constant array as an
>> extension}} const int castfloat = static_cast<int>(1.0); int arr2[castfloat];
>> // ok
>> +
>> +extern const int &Recurse1;
>> +const int &Recurse2 = Recurse1, &Recurse1 = Recurse2;
>>
>>
>>
>> _______________________________________________
>> cfe-commits mailing list cfe-commits at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
>>
>
> -David
>
>
>
>
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