6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-12 13:38:21 +00:00
Code Issues Projects Releases Wiki Activity

Decouple dllexport/dllimport from linkage

Browse Source 
Representing dllexport/dllimport as distinct linkage types prevents using
these attributes on templates and inline functions.

Instead of introducing further mixed linkage types to include linkonce and
weak ODR, the old import/export linkage types are replaced with a new
separate visibility-like specifier:

  define available_externally dllimport void @f() {}
  @Var = dllexport global i32 1, align 4

Linkage for dllexported globals and functions is now equal to their linkage
without dllexport. Imported globals and functions must be either
declarations with external linkage, or definitions with
AvailableExternallyLinkage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199218 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nico Rieck
2014-01-14 15:22:47 +00:00
parent d05a6582da
commit 38f68c5a2e
27 changed files with 547 additions and 157 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -80,8 +80,8 @@ static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
case 2: return GlobalValue::AppendingLinkage;
case 3: return GlobalValue::InternalLinkage;
case 4: return GlobalValue::LinkOnceAnyLinkage;
case 5: return GlobalValue::DLLImportLinkage;
case 6: return GlobalValue::DLLExportLinkage;
case 5: return GlobalValue::ExternalLinkage; // Obsolete DLLImportLinkage
case 6: return GlobalValue::ExternalLinkage; // Obsolete DLLExportLinkage
case 7: return GlobalValue::ExternalWeakLinkage;
case 8: return GlobalValue::CommonLinkage;
case 9: return GlobalValue::PrivateLinkage;
@ -102,6 +102,16 @@ static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
}
}
static GlobalValue::DLLStorageClassTypes
GetDecodedDLLStorageClass(unsigned Val) {
switch (Val) {
default: // Map unknown values to default.
case 0: return GlobalValue::DefaultStorageClass;
case 1: return GlobalValue::DLLImportStorageClass;
case 2: return GlobalValue::DLLExportStorageClass;
}
}
static GlobalVariable::ThreadLocalMode GetDecodedThreadLocalMode(unsigned Val) {
switch (Val) {
case 0: return GlobalVariable::NotThreadLocal;
@ -193,6 +203,13 @@ static SynchronizationScope GetDecodedSynchScope(unsigned Val) {
}
}
static void UpgradeDLLImportExportLinkage(llvm::GlobalValue *GV, unsigned Val) {
switch (Val) {
case 5: GV->setDLLStorageClass(GlobalValue::DLLImportStorageClass); break;
case 6: GV->setDLLStorageClass(GlobalValue::DLLExportStorageClass); break;
}
}
namespace llvm {
namespace {
/// @brief A class for maintaining the slot number definition
@ -1797,7 +1814,7 @@ error_code BitcodeReader::ParseModule(bool Resume) {
}
// GLOBALVAR: [pointer type, isconst, initid,
// linkage, alignment, section, visibility, threadlocal,
// unnamed_addr]
// unnamed_addr, dllstorageclass]
case bitc::MODULE_CODE_GLOBALVAR: {
if (Record.size() < 6)
return Error(InvalidRecord);
@ -1843,6 +1860,11 @@ error_code BitcodeReader::ParseModule(bool Resume) {
NewGV->setVisibility(Visibility);
NewGV->setUnnamedAddr(UnnamedAddr);
if (Record.size() > 10)
NewGV->setDLLStorageClass(GetDecodedDLLStorageClass(Record[10]));
else
UpgradeDLLImportExportLinkage(NewGV, Record[3]);
ValueList.push_back(NewGV);
// Remember which value to use for the global initializer.
@ -1851,7 +1873,8 @@ error_code BitcodeReader::ParseModule(bool Resume) {
break;
}
// FUNCTION: [type, callingconv, isproto, linkage, paramattr,
// alignment, section, visibility, gc, unnamed_addr]
// alignment, section, visibility, gc, unnamed_addr,
// dllstorageclass]
case bitc::MODULE_CODE_FUNCTION: {
if (Record.size() < 8)
return Error(InvalidRecord);
@ -1891,6 +1914,12 @@ error_code BitcodeReader::ParseModule(bool Resume) {
Func->setUnnamedAddr(UnnamedAddr);
if (Record.size() > 10 && Record[10] != 0)
FunctionPrefixes.push_back(std::make_pair(Func, Record[10]-1));
if (Record.size() > 11)
Func->setDLLStorageClass(GetDecodedDLLStorageClass(Record[11]));
else
UpgradeDLLImportExportLinkage(Func, Record[3]);
ValueList.push_back(Func);
// If this is a function with a body, remember the prototype we are
@ -1902,7 +1931,7 @@ error_code BitcodeReader::ParseModule(bool Resume) {
break;
}
// ALIAS: [alias type, aliasee val#, linkage]
// ALIAS: [alias type, aliasee val#, linkage, visibility]
// ALIAS: [alias type, aliasee val#, linkage, visibility, dllstorageclass]
case bitc::MODULE_CODE_ALIAS: {
if (Record.size() < 3)
return Error(InvalidRecord);
@ -1917,6 +1946,10 @@ error_code BitcodeReader::ParseModule(bool Resume) {
// Old bitcode files didn't have visibility field.
if (Record.size() > 3)
NewGA->setVisibility(GetDecodedVisibility(Record[3]));
if (Record.size() > 4)
NewGA->setDLLStorageClass(GetDecodedDLLStorageClass(Record[4]));
else
UpgradeDLLImportExportLinkage(NewGA, Record[2]);
ValueList.push_back(NewGA);
AliasInits.push_back(std::make_pair(NewGA, Record[1]));
break;