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[AMDGPU] Set metadata access for explicit section 

Summary:
This patch provides a means to set Metadata section kind
for a global variable, if its explicit section name is
prefixed with ".AMDGPU.metadata."
This could be useful to make the global variable go to
an ELF section without any section flags set.

Reviewers: dstuttard, tpr, kzhuravl, nhaehnle, t-tye

Reviewed By: dstuttard, kzhuravl

Subscribers: llvm-commits, arsenm, jvesely, wdng, yaxunl, t-tye

Differential Revision: https://reviews.llvm.org/D55267

llvm-svn: 348922
This commit is contained in:
Piotr Sobczak 2018-12-12 11:20:04 +00:00
parent 12d190598a
commit 3732b4ce25
3 changed files with 68 additions and 0 deletions
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10
llvm/lib/Target/AMDGPU/AMDGPUTargetObjectFile.cpp
View File

@ -29,3 +29,13 @@ MCSection *AMDGPUTargetObjectFile::SelectSectionForGlobal(
return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, Kind, TM);
}
MCSection *AMDGPUTargetObjectFile::getExplicitSectionGlobal(
const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
// Set metadata access for the explicit section
StringRef SectionName = GO->getSection();
if (SectionName.startswith(".AMDGPU.metadata."))
SK = SectionKind::getMetadata();
return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, SK, TM);
}

2
llvm/lib/Target/AMDGPU/AMDGPUTargetObjectFile.h
View File

@ -26,6 +26,8 @@ class AMDGPUTargetObjectFile : public TargetLoweringObjectFileELF {
public:
MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
const TargetMachine &TM) const override;
MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
const TargetMachine &TM) const override;
};
} // end namespace llvm

56
llvm/test/CodeGen/AMDGPU/elf.metadata.ll Normal file
View File

@ -0,0 +1,56 @@
; RUN: llc < %s -march=amdgcn -mcpu=fiji -filetype=obj | llvm-readobj -symbols -s -sd - | FileCheck %s
; CHECK: Section {
; CHECK: Name: .AMDGPU.metadata.info_1
; CHECK: Type: SHT_PROGBITS (0x1)
; CHECK: Flags [ (0x0)
; CHECK: Size: 16
; CHECK: SectionData (
; CHECK: 0000: 414D4431 414D4431 414D4431 414D4431 |AMD1AMD1AMD1AMD1|
; CHECK: )
; CHECK: }
; CHECK: Section {
; CHECK: Name: .AMDGPU.metadata.info_2
; CHECK: Type: SHT_PROGBITS (0x1)
; CHECK: Flags [ (0x0)
; CHECK: Size: 16
; CHECK: SectionData (
; CHECK: 0000: 414D4432 414D4432 414D4432 414D4432 |AMD2AMD2AMD2AMD2|
; CHECK: )
; CHECK: }
; CHECK: Section {
; CHECK: Name: .AMDGPU.metadata.info_3
; CHECK: Type: SHT_PROGBITS (0x1)
; CHECK: Flags [ (0x0)
; CHECK: Size: 16
; CHECK: SectionData (
; CHECK: 0000: 414D4433 414D4433 414D4433 414D4433 |AMD3AMD3AMD3AMD3|
; CHECK: )
; CHECK: }
; CHECK: Symbol {
; CHECK: Name: metadata_info_var_1
; CHECK: Size: 16
; CHECK: Binding: Local
; CHECK: Section: .AMDGPU.metadata.info_1
; CHECK: }
; CHECK: Symbol {
; CHECK: Name: metadata_info_var_2
; CHECK: Size: 16
; CHECK: Binding: Global
; CHECK: Section: .AMDGPU.metadata.info_2
; CHECK: }
; CHECK: Symbol {
; CHECK: Name: metadata_info_var_3
; CHECK: Size: 16
; CHECK: Binding: Global
; CHECK: Section: .AMDGPU.metadata.info_3
; CHECK: }
@metadata_info_var_1 = internal global [4 x i32][i32 826559809, i32 826559809, i32 826559809, i32 826559809], align 1, section ".AMDGPU.metadata.info_1"
@metadata_info_var_2 = constant [4 x i32][i32 843337025, i32 843337025, i32 843337025, i32 843337025], align 1, section ".AMDGPU.metadata.info_2"
@metadata_info_var_3 = global [4 x i32][i32 860114241, i32 860114241, i32 860114241, i32 860114241], align 1, section ".AMDGPU.metadata.info_3"