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[GCC] Attribute ifunc support in llvm

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This patch add support for GCC attribute((ifunc("resolver"))) for
targets that use ELF as object file format. In general ifunc is a
special kind of function alias with type @gnu_indirect_function. Patch
for Clang http://reviews.llvm.org/D15524

Differential Revision: http://reviews.llvm.org/D15525

llvm-svn: 265667
This commit is contained in:
Dmitry Polukhin
2016-04-07 12:32:19 +00:00
parent 79cb643b20
commit a1feff7024
24 changed files with 369 additions and 22 deletions
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17
llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
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@@ -86,6 +86,9 @@ static OrderMap orderModule(const Module &M) {
for (const GlobalAlias &A : M.aliases())
if (!isa<GlobalValue>(A.getAliasee()))
orderValue(A.getAliasee(), OM);
for (const GlobalIFunc &I : M.ifuncs())
if (!isa<GlobalValue>(I.getResolver()))
orderValue(I.getResolver(), OM);
for (const Function &F : M) {
for (const Use &U : F.operands())
if (!isa<GlobalValue>(U.get()))
@@ -105,6 +108,8 @@ static OrderMap orderModule(const Module &M) {
orderValue(&F, OM);
for (const GlobalAlias &A : M.aliases())
orderValue(&A, OM);
for (const GlobalIFunc &I : M.ifuncs())
orderValue(&I, OM);
for (const GlobalVariable &G : M.globals())
orderValue(&G, OM);
OM.LastGlobalValueID = OM.size();
@@ -261,11 +266,15 @@ static UseListOrderStack predictUseListOrder(const Module &M) {
predictValueUseListOrder(&F, nullptr, OM, Stack);
for (const GlobalAlias &A : M.aliases())
predictValueUseListOrder(&A, nullptr, OM, Stack);
for (const GlobalIFunc &I : M.ifuncs())
predictValueUseListOrder(&I, nullptr, OM, Stack);
for (const GlobalVariable &G : M.globals())
if (G.hasInitializer())
predictValueUseListOrder(G.getInitializer(), nullptr, OM, Stack);
for (const GlobalAlias &A : M.aliases())
predictValueUseListOrder(A.getAliasee(), nullptr, OM, Stack);
for (const GlobalIFunc &I : M.ifuncs())
predictValueUseListOrder(I.getResolver(), nullptr, OM, Stack);
for (const Function &F : M) {
for (const Use &U : F.operands())
predictValueUseListOrder(U.get(), nullptr, OM, Stack);
@@ -298,6 +307,10 @@ ValueEnumerator::ValueEnumerator(const Module &M,
for (const GlobalAlias &GA : M.aliases())
EnumerateValue(&GA);
// Enumerate the ifuncs.
for (const GlobalIFunc &GIF : M.ifuncs())
EnumerateValue(&GIF);
// Remember what is the cutoff between globalvalue's and other constants.
unsigned FirstConstant = Values.size();
@@ -310,6 +323,10 @@ ValueEnumerator::ValueEnumerator(const Module &M,
for (const GlobalAlias &GA : M.aliases())
EnumerateValue(GA.getAliasee());
// Enumerate the ifunc resolvers.
for (const GlobalIFunc &GIF : M.ifuncs())
EnumerateValue(GIF.getResolver());
// Enumerate any optional Function data.
for (const Function &F : M)
for (const Use &U : F.operands())