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Diffstat (limited to 'lib/Parse/DeclSpec.cpp')
| -rw-r--r-- | lib/Parse/DeclSpec.cpp | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/lib/Parse/DeclSpec.cpp b/lib/Parse/DeclSpec.cpp new file mode 100644 index 0000000..d8c6986 --- /dev/null +++ b/lib/Parse/DeclSpec.cpp @@ -0,0 +1,395 @@ +//===--- SemaDeclSpec.cpp - Declaration Specifier Semantic Analysis -------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements semantic analysis for declaration specifiers. +// +//===----------------------------------------------------------------------===// + +#include "clang/Parse/DeclSpec.h" +#include "clang/Parse/ParseDiagnostic.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Basic/LangOptions.h" +#include "llvm/ADT/STLExtras.h" +#include <cstring> +using namespace clang; + + +static DiagnosticBuilder Diag(Diagnostic &D, SourceLocation Loc, + SourceManager &SrcMgr, unsigned DiagID) { + return D.Report(FullSourceLoc(Loc, SrcMgr), DiagID); +} + +/// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function. +/// "TheDeclarator" is the declarator that this will be added to. +DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto, bool isVariadic, + SourceLocation EllipsisLoc, + ParamInfo *ArgInfo, + unsigned NumArgs, + unsigned TypeQuals, + bool hasExceptionSpec, + SourceLocation ThrowLoc, + bool hasAnyExceptionSpec, + ActionBase::TypeTy **Exceptions, + SourceRange *ExceptionRanges, + unsigned NumExceptions, + SourceLocation Loc, + Declarator &TheDeclarator) { + DeclaratorChunk I; + I.Kind = Function; + I.Loc = Loc; + I.Fun.hasPrototype = hasProto; + I.Fun.isVariadic = isVariadic; + I.Fun.EllipsisLoc = EllipsisLoc.getRawEncoding(); + I.Fun.DeleteArgInfo = false; + I.Fun.TypeQuals = TypeQuals; + I.Fun.NumArgs = NumArgs; + I.Fun.ArgInfo = 0; + I.Fun.hasExceptionSpec = hasExceptionSpec; + I.Fun.ThrowLoc = ThrowLoc.getRawEncoding(); + I.Fun.hasAnyExceptionSpec = hasAnyExceptionSpec; + I.Fun.NumExceptions = NumExceptions; + I.Fun.Exceptions = 0; + + // new[] an argument array if needed. + if (NumArgs) { + // If the 'InlineParams' in Declarator is unused and big enough, put our + // parameter list there (in an effort to avoid new/delete traffic). If it + // is already used (consider a function returning a function pointer) or too + // small (function taking too many arguments), go to the heap. + if (!TheDeclarator.InlineParamsUsed && + NumArgs <= llvm::array_lengthof(TheDeclarator.InlineParams)) { + I.Fun.ArgInfo = TheDeclarator.InlineParams; + I.Fun.DeleteArgInfo = false; + TheDeclarator.InlineParamsUsed = true; + } else { + I.Fun.ArgInfo = new DeclaratorChunk::ParamInfo[NumArgs]; + I.Fun.DeleteArgInfo = true; + } + memcpy(I.Fun.ArgInfo, ArgInfo, sizeof(ArgInfo[0])*NumArgs); + } + // new[] an exception array if needed + if (NumExceptions) { + I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions]; + for (unsigned i = 0; i != NumExceptions; ++i) { + I.Fun.Exceptions[i].Ty = Exceptions[i]; + I.Fun.Exceptions[i].Range = ExceptionRanges[i]; + } + } + return I; +} + +/// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this +/// declaration specifier includes. +/// +unsigned DeclSpec::getParsedSpecifiers() const { + unsigned Res = 0; + if (StorageClassSpec != SCS_unspecified || + SCS_thread_specified) + Res |= PQ_StorageClassSpecifier; + + if (TypeQualifiers != TQ_unspecified) + Res |= PQ_TypeQualifier; + + if (hasTypeSpecifier()) + Res |= PQ_TypeSpecifier; + + if (FS_inline_specified || FS_virtual_specified || FS_explicit_specified) + Res |= PQ_FunctionSpecifier; + return Res; +} + +const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) { + switch (S) { + default: assert(0 && "Unknown typespec!"); + case DeclSpec::SCS_unspecified: return "unspecified"; + case DeclSpec::SCS_typedef: return "typedef"; + case DeclSpec::SCS_extern: return "extern"; + case DeclSpec::SCS_static: return "static"; + case DeclSpec::SCS_auto: return "auto"; + case DeclSpec::SCS_register: return "register"; + case DeclSpec::SCS_private_extern: return "__private_extern__"; + case DeclSpec::SCS_mutable: return "mutable"; + } +} + +bool DeclSpec::BadSpecifier(SCS S, const char *&PrevSpec) { + PrevSpec = getSpecifierName(S); + return true; +} + +bool DeclSpec::BadSpecifier(TSW W, const char *&PrevSpec) { + switch (W) { + case TSW_unspecified: PrevSpec = "unspecified"; break; + case TSW_short: PrevSpec = "short"; break; + case TSW_long: PrevSpec = "long"; break; + case TSW_longlong: PrevSpec = "long long"; break; + } + return true; +} + +bool DeclSpec::BadSpecifier(TSC C, const char *&PrevSpec) { + switch (C) { + case TSC_unspecified: PrevSpec = "unspecified"; break; + case TSC_imaginary: PrevSpec = "imaginary"; break; + case TSC_complex: PrevSpec = "complex"; break; + } + return true; +} + + +bool DeclSpec::BadSpecifier(TSS S, const char *&PrevSpec) { + switch (S) { + case TSS_unspecified: PrevSpec = "unspecified"; break; + case TSS_signed: PrevSpec = "signed"; break; + case TSS_unsigned: PrevSpec = "unsigned"; break; + } + return true; +} + +const char *DeclSpec::getSpecifierName(DeclSpec::TST T) { + switch (T) { + default: assert(0 && "Unknown typespec!"); + case DeclSpec::TST_unspecified: return "unspecified"; + case DeclSpec::TST_void: return "void"; + case DeclSpec::TST_char: return "char"; + case DeclSpec::TST_wchar: return "wchar_t"; + case DeclSpec::TST_int: return "int"; + case DeclSpec::TST_float: return "float"; + case DeclSpec::TST_double: return "double"; + case DeclSpec::TST_bool: return "_Bool"; + case DeclSpec::TST_decimal32: return "_Decimal32"; + case DeclSpec::TST_decimal64: return "_Decimal64"; + case DeclSpec::TST_decimal128: return "_Decimal128"; + case DeclSpec::TST_enum: return "enum"; + case DeclSpec::TST_class: return "class"; + case DeclSpec::TST_union: return "union"; + case DeclSpec::TST_struct: return "struct"; + case DeclSpec::TST_typename: return "type-name"; + case DeclSpec::TST_typeofType: + case DeclSpec::TST_typeofExpr: return "typeof"; + } +} + +bool DeclSpec::BadSpecifier(TST T, const char *&PrevSpec) { + PrevSpec = getSpecifierName(T); + return true; +} + +bool DeclSpec::BadSpecifier(TQ T, const char *&PrevSpec) { + switch (T) { + case DeclSpec::TQ_unspecified: PrevSpec = "unspecified"; break; + case DeclSpec::TQ_const: PrevSpec = "const"; break; + case DeclSpec::TQ_restrict: PrevSpec = "restrict"; break; + case DeclSpec::TQ_volatile: PrevSpec = "volatile"; break; + } + return true; +} + +bool DeclSpec::SetStorageClassSpec(SCS S, SourceLocation Loc, + const char *&PrevSpec) { + if (StorageClassSpec != SCS_unspecified) + return BadSpecifier((SCS)StorageClassSpec, PrevSpec); + StorageClassSpec = S; + StorageClassSpecLoc = Loc; + assert((unsigned)S == StorageClassSpec && "SCS constants overflow bitfield"); + return false; +} + +bool DeclSpec::SetStorageClassSpecThread(SourceLocation Loc, + const char *&PrevSpec) { + if (SCS_thread_specified) { + PrevSpec = "__thread"; + return true; + } + SCS_thread_specified = true; + SCS_threadLoc = Loc; + return false; +} + + +/// These methods set the specified attribute of the DeclSpec, but return true +/// and ignore the request if invalid (e.g. "extern" then "auto" is +/// specified). +bool DeclSpec::SetTypeSpecWidth(TSW W, SourceLocation Loc, + const char *&PrevSpec) { + if (TypeSpecWidth != TSW_unspecified && + // Allow turning long -> long long. + (W != TSW_longlong || TypeSpecWidth != TSW_long)) + return BadSpecifier((TSW)TypeSpecWidth, PrevSpec); + TypeSpecWidth = W; + TSWLoc = Loc; + return false; +} + +bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc, + const char *&PrevSpec) { + if (TypeSpecComplex != TSC_unspecified) + return BadSpecifier((TSC)TypeSpecComplex, PrevSpec); + TypeSpecComplex = C; + TSCLoc = Loc; + return false; +} + +bool DeclSpec::SetTypeSpecSign(TSS S, SourceLocation Loc, + const char *&PrevSpec) { + if (TypeSpecSign != TSS_unspecified) + return BadSpecifier((TSS)TypeSpecSign, PrevSpec); + TypeSpecSign = S; + TSSLoc = Loc; + return false; +} + +bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc, + const char *&PrevSpec, void *Rep, + bool Owned) { + if (TypeSpecType != TST_unspecified) + return BadSpecifier((TST)TypeSpecType, PrevSpec); + TypeSpecType = T; + TypeRep = Rep; + TSTLoc = Loc; + TypeSpecOwned = Owned; + return false; +} + +bool DeclSpec::SetTypeSpecError() { + TypeSpecType = TST_error; + TypeRep = 0; + TSTLoc = SourceLocation(); + return false; +} + +bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec, + const LangOptions &Lang) { + // Duplicates turn into warnings pre-C99. + if ((TypeQualifiers & T) && !Lang.C99) + return BadSpecifier(T, PrevSpec); + TypeQualifiers |= T; + + switch (T) { + default: assert(0 && "Unknown type qualifier!"); + case TQ_const: TQ_constLoc = Loc; break; + case TQ_restrict: TQ_restrictLoc = Loc; break; + case TQ_volatile: TQ_volatileLoc = Loc; break; + } + return false; +} + +bool DeclSpec::SetFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec){ + // 'inline inline' is ok. + FS_inline_specified = true; + FS_inlineLoc = Loc; + return false; +} + +bool DeclSpec::SetFunctionSpecVirtual(SourceLocation Loc, const char *&PrevSpec){ + // 'virtual virtual' is ok. + FS_virtual_specified = true; + FS_virtualLoc = Loc; + return false; +} + +bool DeclSpec::SetFunctionSpecExplicit(SourceLocation Loc, const char *&PrevSpec){ + // 'explicit explicit' is ok. + FS_explicit_specified = true; + FS_explicitLoc = Loc; + return false; +} + +bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec) { + if (Friend_specified) { + PrevSpec = "friend"; + return true; + } + + Friend_specified = true; + FriendLoc = Loc; + return false; +} + +/// Finish - This does final analysis of the declspec, rejecting things like +/// "_Imaginary" (lacking an FP type). This returns a diagnostic to issue or +/// diag::NUM_DIAGNOSTICS if there is no error. After calling this method, +/// DeclSpec is guaranteed self-consistent, even if an error occurred. +void DeclSpec::Finish(Diagnostic &D, Preprocessor &PP) { + // Check the type specifier components first. + SourceManager &SrcMgr = PP.getSourceManager(); + + // signed/unsigned are only valid with int/char/wchar_t. + if (TypeSpecSign != TSS_unspecified) { + if (TypeSpecType == TST_unspecified) + TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int. + else if (TypeSpecType != TST_int && + TypeSpecType != TST_char && TypeSpecType != TST_wchar) { + Diag(D, TSSLoc, SrcMgr, diag::err_invalid_sign_spec) + << getSpecifierName((TST)TypeSpecType); + // signed double -> double. + TypeSpecSign = TSS_unspecified; + } + } + + // Validate the width of the type. + switch (TypeSpecWidth) { + case TSW_unspecified: break; + case TSW_short: // short int + case TSW_longlong: // long long int + if (TypeSpecType == TST_unspecified) + TypeSpecType = TST_int; // short -> short int, long long -> long long int. + else if (TypeSpecType != TST_int) { + Diag(D, TSWLoc, SrcMgr, + TypeSpecWidth == TSW_short ? diag::err_invalid_short_spec + : diag::err_invalid_longlong_spec) + << getSpecifierName((TST)TypeSpecType); + TypeSpecType = TST_int; + } + break; + case TSW_long: // long double, long int + if (TypeSpecType == TST_unspecified) + TypeSpecType = TST_int; // long -> long int. + else if (TypeSpecType != TST_int && TypeSpecType != TST_double) { + Diag(D, TSWLoc, SrcMgr, diag::err_invalid_long_spec) + << getSpecifierName((TST)TypeSpecType); + TypeSpecType = TST_int; + } + break; + } + + // TODO: if the implementation does not implement _Complex or _Imaginary, + // disallow their use. Need information about the backend. + if (TypeSpecComplex != TSC_unspecified) { + if (TypeSpecType == TST_unspecified) { + Diag(D, TSCLoc, SrcMgr, diag::ext_plain_complex) + << CodeModificationHint::CreateInsertion( + PP.getLocForEndOfToken(getTypeSpecComplexLoc()), + " double"); + TypeSpecType = TST_double; // _Complex -> _Complex double. + } else if (TypeSpecType == TST_int || TypeSpecType == TST_char) { + // Note that this intentionally doesn't include _Complex _Bool. + Diag(D, TSTLoc, SrcMgr, diag::ext_integer_complex); + } else if (TypeSpecType != TST_float && TypeSpecType != TST_double) { + Diag(D, TSCLoc, SrcMgr, diag::err_invalid_complex_spec) + << getSpecifierName((TST)TypeSpecType); + TypeSpecComplex = TSC_unspecified; + } + } + + // Okay, now we can infer the real type. + + // TODO: return "auto function" and other bad things based on the real type. + + // 'data definition has no type or storage class'? +} + +bool DeclSpec::isMissingDeclaratorOk() { + TST tst = getTypeSpecType(); + return (tst == TST_union + || tst == TST_struct + || tst == TST_class + || tst == TST_enum + ) && getTypeRep() != 0 && StorageClassSpec != DeclSpec::SCS_typedef; +} |
