[clang] ea2cfda - [CGExpr] Use getCharWidth() more consistently in CCGExprConstant. NFC

[Bjorn Pettersson via cfe-commits]

Author: Bjorn Pettersson
Date: 2021-01-22T21:12:17+01:00
New Revision: ea2cfda386f1a0f0b8cab06a9400bbf4cf7bfbaa

URL: https://github.com/llvm/llvm-project/commit/ea2cfda386f1a0f0b8cab06a9400bbf4cf7bfbaa
DIFF: https://github.com/llvm/llvm-project/commit/ea2cfda386f1a0f0b8cab06a9400bbf4cf7bfbaa.diff

LOG: [CGExpr] Use getCharWidth() more consistently in CCGExprConstant. NFC

Most of CGExprConstant.cpp is using the CharUnits abstraction
and is using getCharWidth() (directly of indirectly) when converting
between size of a char and size in bits. This patch is making that
abstraction more consistent by adding CharTy to the CodeGenTypeCache
(honoring getCharWidth() when mapping from char to LLVM IR types,
instead of using Int8Ty directly).

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D94979

Added: 
    

Modified: 
    clang/lib/CodeGen/CGExprConstant.cpp
    clang/lib/CodeGen/CodeGenModule.cpp
    clang/lib/CodeGen/CodeGenTypeCache.h

Removed: 
    


################################################################################
diff  --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index ca1d3a937fa8..497f9c04c9f8 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -58,14 +58,14 @@ struct ConstantAggregateBuilderUtils {
   }
 
   llvm::Constant *getPadding(CharUnits PadSize) const {
-    llvm::Type *Ty = CGM.Int8Ty;
+    llvm::Type *Ty = CGM.CharTy;
     if (PadSize > CharUnits::One())
       Ty = llvm::ArrayType::get(Ty, PadSize.getQuantity());
     return llvm::UndefValue::get(Ty);
   }
 
   llvm::Constant *getZeroes(CharUnits ZeroSize) const {
-    llvm::Type *Ty = llvm::ArrayType::get(CGM.Int8Ty, ZeroSize.getQuantity());
+    llvm::Type *Ty = llvm::ArrayType::get(CGM.CharTy, ZeroSize.getQuantity());
     return llvm::ConstantAggregateZero::get(Ty);
   }
 };
@@ -1069,7 +1069,7 @@ class ConstExprEmitter :
 
       assert(CurSize <= TotalSize && "Union size mismatch!");
       if (unsigned NumPadBytes = TotalSize - CurSize) {
-        llvm::Type *Ty = CGM.Int8Ty;
+        llvm::Type *Ty = CGM.CharTy;
         if (NumPadBytes > 1)
           Ty = llvm::ArrayType::get(Ty, NumPadBytes);
 

diff  --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 18d633911f55..d93c9690cfb2 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -123,6 +123,8 @@ CodeGenModule::CodeGenModule(ASTContext &C, const HeaderSearchOptions &HSO,
     C.toCharUnitsFromBits(C.getTargetInfo().getMaxPointerWidth()).getQuantity();
   IntAlignInBytes =
     C.toCharUnitsFromBits(C.getTargetInfo().getIntAlign()).getQuantity();
+  CharTy =
+    llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getCharWidth());
   IntTy = llvm::IntegerType::get(LLVMContext, C.getTargetInfo().getIntWidth());
   IntPtrTy = llvm::IntegerType::get(LLVMContext,
     C.getTargetInfo().getMaxPointerWidth());

diff  --git a/clang/lib/CodeGen/CodeGenTypeCache.h b/clang/lib/CodeGen/CodeGenTypeCache.h
index 20a3263c0b1a..f258234fb4d8 100644
--- a/clang/lib/CodeGen/CodeGenTypeCache.h
+++ b/clang/lib/CodeGen/CodeGenTypeCache.h
@@ -41,6 +41,9 @@ struct CodeGenTypeCache {
   /// int
   llvm::IntegerType *IntTy;
 
+  /// char
+  llvm::IntegerType *CharTy;
+
   /// intptr_t, size_t, and ptr
diff _t, which we assume are the same size.
   union {
     llvm::IntegerType *IntPtrTy;