[PATCH] D39739: [HCC] Add flag to Import Weak Functions in Function Importer
Aaron En Ye Shi via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Thu Nov 9 10:44:33 PST 2017
ashi1 updated this revision to Diff 122271.
ashi1 added subscribers: scchan, yaxunl, ashi1.
ashi1 added a comment.
Herald added a subscriber: eraman.
I've added the lit tests for this change, and also showing full context.
My lit test import_weak_type.ll follows similar format to import_opaque_type.ll.
Repository:
rL LLVM
https://reviews.llvm.org/D39739
Files:
include/llvm/Transforms/Utils/FunctionImportUtils.h
lib/Transforms/IPO/FunctionImport.cpp
lib/Transforms/Utils/FunctionImportUtils.cpp
test/ThinLTO/X86/Inputs/import_weak_type.ll
test/ThinLTO/X86/import_weak_type.ll
Index: test/ThinLTO/X86/import_weak_type.ll
===================================================================
--- /dev/null
+++ test/ThinLTO/X86/import_weak_type.ll
@@ -0,0 +1,19 @@
+; Do setup work for all below tests: generate bitcode and combined index
+; RUN: opt -module-summary %s -o %t.bc
+; RUN: opt -module-summary %p/Inputs/import_weak_type.ll -o %t2.bc
+; RUN: llvm-lto -thinlto-action=thinlink -o %t3.bc %t.bc %t2.bc
+
+; Check that we import correctly the imported weak type to replace declaration here
+; RUN: llvm-lto -thinlto-action=import %t.bc -thinlto-index=%t3.bc -force-import-weak -o - | llvm-dis -o - | FileCheck %s
+; CHECK: define weak void @foo()
+
+
+target datalayout = "e-p:64:64-p1:64:64-p2:64:64-p3:32:32-p4:32:32-p5:32:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-A5"
+target triple = "amdgcn--amdhsa-hcc"
+
+declare extern_weak void @foo()
+define weak_odr amdgpu_kernel void @main() {
+ call void @foo()
+ ret void
+}
+
Index: test/ThinLTO/X86/Inputs/import_weak_type.ll
===================================================================
--- /dev/null
+++ test/ThinLTO/X86/Inputs/import_weak_type.ll
@@ -0,0 +1,7 @@
+target datalayout = "e-p:64:64-p1:64:64-p2:64:64-p3:32:32-p4:32:32-p5:32:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-A5"
+target triple = "amdgcn--amdhsa-hcc"
+
+define weak void @foo() {
+ ret void
+}
+
Index: lib/Transforms/Utils/FunctionImportUtils.cpp
===================================================================
--- lib/Transforms/Utils/FunctionImportUtils.cpp
+++ lib/Transforms/Utils/FunctionImportUtils.cpp
@@ -151,7 +151,8 @@
// program semantics, since the linker will pick the first weak_any
// definition and importing would change the order they are seen by the
// linker. The module linking caller needs to enforce this.
- assert(!doImportAsDefinition(SGV));
+ if(!ForceImportWeakFlag)
+ assert(!doImportAsDefinition(SGV));
// If imported as a declaration, it becomes external_weak.
return SGV->getLinkage();
Index: lib/Transforms/IPO/FunctionImport.cpp
===================================================================
--- lib/Transforms/IPO/FunctionImport.cpp
+++ lib/Transforms/IPO/FunctionImport.cpp
@@ -102,6 +102,12 @@
static cl::opt<bool> ComputeDead("compute-dead", cl::init(true), cl::Hidden,
cl::desc("Compute dead symbols"));
+bool llvm::ForceImportWeakFlag;
+static cl::opt<bool, true>
+ForceImportWeak("force-import-weak", cl::Hidden,
+ cl::desc("Allow weak functions to be imported"),
+ cl::location(ForceImportWeakFlag), cl::init(false));
+
static cl::opt<bool> EnableImportMetadata(
"enable-import-metadata", cl::init(
#if !defined(NDEBUG)
@@ -169,7 +175,7 @@
// filtered out.
if (GVSummary->getSummaryKind() == GlobalValueSummary::GlobalVarKind)
return false;
- if (GlobalValue::isInterposableLinkage(GVSummary->linkage()))
+ if (!ForceImportWeakFlag && GlobalValue::isInterposableLinkage(GVSummary->linkage()))
// There is no point in importing these, we can't inline them
return false;
if (isa<AliasSummary>(GVSummary))
Index: include/llvm/Transforms/Utils/FunctionImportUtils.h
===================================================================
--- include/llvm/Transforms/Utils/FunctionImportUtils.h
+++ include/llvm/Transforms/Utils/FunctionImportUtils.h
@@ -21,6 +21,9 @@
namespace llvm {
class Module;
+// Set to true depending on option -force-import-weak
+extern bool ForceImportWeakFlag;
+
/// Class to handle necessary GlobalValue changes required by ThinLTO
/// function importing, including linkage changes and any necessary renaming.
class FunctionImportGlobalProcessing {
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