[PATCH] D46915: Set Fixed Point Precision Bits and Create Fixed Point Literals

[Leonard Chan via Phabricator via cfe-commits]

leonardchan created this revision.
leonardchan added reviewers: phosek, mcgrathr, jakehehrlich.
leonardchan added a project: clang.
Herald added a subscriber: mgorny.

This diff includes the logic for setting the precision bits for each primary fixed point type when building clang and logic for initializing a fixed point literal.

The precision bits are set when building cmake via the flags

  SACCUM_FBIT
  ACCUM_FBIT
  LACCUM_FBIT
  ...

More checks to ensure the bit values used are valid will be added in future patches.

Fixed point literals are declared using the suffixes

  hr: short _Fract
  uhr: unsigned short _Fract
  r: _Fract
  ur: unsigned _Fract
  lr: long _Fract
  ulr: unsigned long _Fract
  hk: short _Accum
  uhk: unsigned short _Accum
  k: _Accum
  uk: unsigned _Accum

Errors are also thrown for literal values that exceed the range of the type corresponding to the suffix

  unsigned short _Accum u_short_accum = 256.0uhk;   // expected-error{{the integral part of this literal is too large for this unsigned _Accum type}}

This is a parent of https://reviews.llvm.org/D46911


Repository:
  rC Clang

https://reviews.llvm.org/D46915

Files:
  CMakeLists.txt
  cmake/modules/InitFixedPointBits.cmake
  include/clang/AST/Expr.h
  include/clang/AST/OperationKinds.def
  include/clang/AST/RecursiveASTVisitor.h
  include/clang/AST/Type.h
  include/clang/Basic/DiagnosticCommonKinds.td
  include/clang/Basic/FixedPoint.h.in
  include/clang/Basic/StmtNodes.td
  include/clang/Lex/LiteralSupport.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTDumper.cpp
  lib/AST/Expr.cpp
  lib/AST/ExprClassification.cpp
  lib/AST/ExprConstant.cpp
  lib/AST/ItaniumMangle.cpp
  lib/AST/StmtPrinter.cpp
  lib/AST/StmtProfile.cpp
  lib/AST/Type.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprAgg.cpp
  lib/CodeGen/CGExprComplex.cpp
  lib/CodeGen/CGExprConstant.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/Edit/RewriteObjCFoundationAPI.cpp
  lib/Lex/LiteralSupport.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaExceptionSpec.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/TreeTransform.h
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriterStmt.cpp
  lib/StaticAnalyzer/Core/ExprEngine.cpp
  lib/StaticAnalyzer/Core/ExprEngineC.cpp
  test/Frontend/fixed_point.c
  test/Frontend/fixed_point_declarations.c
  test/Frontend/fixed_point_errors.c
  test/Frontend/fixed_point_validation.c
  tools/libclang/CXCursor.cpp

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