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Add module flags metadata to record the settings for enum and wchar width 

Add module flags metadata to record the settings for enum and wchar width,
to allow correct ARM build attribute generation

llvm-svn: 211354
This commit is contained in:
Oliver Stannard 2014-06-20 12:43:07 +00:00
parent c2a363aa33
commit e3a4fb6512
2 changed files with 30 additions and 0 deletions
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17
clang/lib/CodeGen/CodeGenModule.cpp
View File

@ -352,6 +352,23 @@ void CodeGenModule::Release() {
getModule().addModuleFlag(llvm::Module::Warning, "Debug Info Version",
llvm::DEBUG_METADATA_VERSION);
// We need to record the widths of enums and wchar_t, so that we can generate
// the correct build attributes in the ARM backend.
llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
if ( Arch == llvm::Triple::arm
|| Arch == llvm::Triple::armeb
|| Arch == llvm::Triple::thumb
|| Arch == llvm::Triple::thumbeb) {
// Width of wchar_t in bytes
uint64_t WCharWidth =
Context.getTypeSizeInChars(Context.getWideCharType()).getQuantity();
getModule().addModuleFlag(llvm::Module::Error, "wchar_size", WCharWidth);
// The minimum width of an enum in bytes
uint64_t EnumWidth = Context.getLangOpts().ShortEnums ? 1 : 4;
getModule().addModuleFlag(llvm::Module::Error, "min_enum_size", EnumWidth);
}
SimplifyPersonality();
if (getCodeGenOpts().EmitDeclMetadata)

13
clang/test/CodeGen/arm-metadata.c Normal file
View File

@ -0,0 +1,13 @@
// REQUIRES: arm-registered-target
// RUN: %clang_cc1 -triple armv7a-linux-gnueabi -emit-llvm -o - %s | FileCheck -check-prefix=DEFAULT %s
// RUN: %clang_cc1 -triple armv7a-linux-gnueabi -emit-llvm -o - %s -fshort-enums | FileCheck -check-prefix=SHORT-ENUM %s
// RUN: %clang_cc1 -triple armv7a-linux-gnueabi -emit-llvm -o - %s -fshort-wchar | FileCheck -check-prefix=SHORT-WCHAR %s
// DEFAULT: !{{[0-9]+}} = metadata !{i32 1, metadata !"wchar_size", i32 4}
// DEFAULT: !{{[0-9]+}} = metadata !{i32 1, metadata !"min_enum_size", i32 4}
// SHORT-WCHAR: !{{[0-9]+}} = metadata !{i32 1, metadata !"wchar_size", i32 2}
// SHORT-WCHAR: !{{[0-9]+}} = metadata !{i32 1, metadata !"min_enum_size", i32 4}
// SHORT_ENUM: !{{[0-9]+}} = metadata !{i32 1, metadata !"wchar_size", i32 4}
// SHORT-ENUM: !{{[0-9]+}} = metadata !{i32 1, metadata !"min_enum_size", i32 1}