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[NVPTX] Do not emit .weak symbols for NVPTX
Summary: ".weak" symbols cannot be consumed by ptxas (PR21685). This patch makes the weak directive in MCAsmPrinter customizable, and disables emitting ".weak" symbols for NVPTX. Test Plan: weak-linkage.ll Reviewers: jholewinski Reviewed By: jholewinski Subscribers: majnemer, jholewinski, llvm-commits Differential Revision: http://reviews.llvm.org/D6455 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223077 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -215,7 +215,8 @@ protected:
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//===--- Global Variable Emission Directives --------------------------===//
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/// This is the directive used to declare a global entity. Defaults to NULL.
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/// This is the directive used to declare a global entity. Defaults to
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/// ".globl".
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const char *GlobalDirective;
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/// True if the expression
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@ -264,6 +265,9 @@ protected:
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/// to false.
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bool HasNoDeadStrip;
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/// Used to declare a global as being a weak symbol. Defaults to ".weak".
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const char *WeakDirective;
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/// This directive, if non-null, is used to declare a global as being a weak
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/// undefined symbol. Defaults to NULL.
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const char *WeakRefDirective;
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@ -452,6 +456,7 @@ public:
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bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
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bool hasIdentDirective() const { return HasIdentDirective; }
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bool hasNoDeadStrip() const { return HasNoDeadStrip; }
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const char *getWeakDirective() const { return WeakDirective; }
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const char *getWeakRefDirective() const { return WeakRefDirective; }
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bool hasWeakDefDirective() const { return HasWeakDefDirective; }
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bool hasWeakDefCanBeHiddenDirective() const {
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@ -71,6 +71,7 @@ MCAsmInfo::MCAsmInfo() {
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HasSingleParameterDotFile = true;
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HasIdentDirective = false;
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HasNoDeadStrip = false;
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WeakDirective = "\t.weak\t";
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WeakRefDirective = nullptr;
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HasWeakDefDirective = false;
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HasWeakDefCanBeHiddenDirective = false;
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@ -443,7 +443,7 @@ bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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break;
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case MCSA_Protected: OS << "\t.protected\t"; break;
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case MCSA_Reference: OS << "\t.reference\t"; break;
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case MCSA_Weak: OS << "\t.weak\t"; break;
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case MCSA_Weak: OS << MAI->getWeakDirective(); break;
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case MCSA_WeakDefinition:
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OS << "\t.weak_definition\t";
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break;
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@ -50,5 +50,6 @@ NVPTXMCAsmInfo::NVPTXMCAsmInfo(StringRef TT) {
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AscizDirective = " .b8";
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// @TODO: Can we just disable this?
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WeakDirective = "\t// .weak\t";
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GlobalDirective = "\t// .globl\t";
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}
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@ -1,11 +1,17 @@
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; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s
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; CHECK: // .weak foo
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; CHECK: .weak .func foo
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define weak void @foo() {
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ret void
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}
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; CHECK: // .weak baz
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; CHECK: .weak .func baz
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define weak_odr void @baz() {
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ret void
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}
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; CHECK: .visible .func bar
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define void @bar() {
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ret void
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