[ELF][RISCV] Parse BFD names elf{32,64}-littleriscv

[MaskRay]

Summary

e.g. glibc rv64 libc.so uses OUTPUT_FORMAT(elf64-littleriscv).

[MaskRay]

Fix REQUIRES: line

[ruiu]

LGTM

lld/trunk/ELF/ScriptParser.cpp

return StringSwitch<std::pair<ELFKind, uint16_t>>(S)
       .Case("elf64-powerpcle", {ELF64LEKind, EM_PPC64})
       .Case("elf64-x86-64", {ELF64LEKind, EM_X86_64})
       .Cases("elf32-tradbigmips", "elf32-bigmips", {ELF32BEKind, EM_MIPS})
       .Case("elf32-ntradbigmips", {ELF32BEKind, EM_MIPS})
       .Case("elf32-tradlittlemips", {ELF32LEKind, EM_MIPS})
       .Case("elf32-ntradlittlemips", {ELF32LEKind, EM_MIPS})
       .Case("elf64-tradbigmips", {ELF64BEKind, EM_MIPS})
       .Case("elf64-tradlittlemips", {ELF64LEKind, EM_MIPS})
+      .Case("elf32-littleriscv", {ELF32LEKind, EM_RISCV})
+      .Case("elf64-littleriscv", {ELF64LEKind, EM_RISCV})
       .Default({ELFNoneKind, EM_NONE});
 }
 
 // Parse OUTPUT_FORMAT(bfdname) or OUTPUT_FORMAT(bfdname, big, little).
 // Currently we ignore big and little parameters.
 void ScriptParser::readOutputFormat() {
   expect("(");
 

lld/trunk/test/ELF/emulation-riscv.s

+# REQUIRES: riscv
+
+# RUN: llvm-mc -filetype=obj -triple=riscv32 %s -o %t.o
+# RUN: ld.lld %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV32 %s
+# RUN: ld.lld -m elf32lriscv %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV32 %s
+# RUN: echo 'OUTPUT_FORMAT(elf32-littleriscv)' > %t.script
+# RUN: ld.lld %t.script %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV32 %s
+
+# RV32:      ElfHeader {
+# RV32-NEXT:   Ident {
+# RV32-NEXT:     Magic: (7F 45 4C 46)
+# RV32-NEXT:     Class: 32-bit (0x1)
+# RV32-NEXT:     DataEncoding: LittleEndian (0x1)
+# RV32-NEXT:     FileVersion: 1
+# RV32-NEXT:     OS/ABI: SystemV (0x0)
+# RV32-NEXT:     ABIVersion: 0
+# RV32-NEXT:     Unused: (00 00 00 00 00 00 00)
+# RV32-NEXT:   }
+# RV32-NEXT:   Type: Executable (0x2)
+# RV32-NEXT:   Machine: EM_RISCV (0xF3)
+# RV32-NEXT:   Version: 1
+# RV32-NEXT:   Entry:
+# RV32-NEXT:   ProgramHeaderOffset: 0x34
+# RV32-NEXT:   SectionHeaderOffset:
+# RV32-NEXT:   Flags [ (0x0)
+# RV32-NEXT:   ]
+# RV32-NEXT:   HeaderSize: 52
+# RV32-NEXT:   ProgramHeaderEntrySize: 32
+# RV32-NEXT:   ProgramHeaderCount:
+# RV32-NEXT:   SectionHeaderEntrySize: 40
+# RV32-NEXT:   SectionHeaderCount:
+# RV32-NEXT:   StringTableSectionIndex:
+# RV32-NEXT: }
+
+# RUN: llvm-mc -filetype=obj -triple=riscv64 %s -o %t.o
+# RUN: ld.lld %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV64 %s
+# RUN: ld.lld -m elf64lriscv %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV64 %s
+# RUN: echo 'OUTPUT_FORMAT(elf64-littleriscv)' > %t.script
+# RUN: ld.lld %t.script %t.o -o %t
+# RUN: llvm-readobj --file-headers %t | FileCheck --check-prefix=RV64 %s
+
+# RV64:      ElfHeader {
+# RV64-NEXT:   Ident {
+# RV64-NEXT:     Magic: (7F 45 4C 46)
+# RV64-NEXT:     Class: 64-bit (0x2)
+# RV64-NEXT:     DataEncoding: LittleEndian (0x1)
+# RV64-NEXT:     FileVersion: 1
+# RV64-NEXT:     OS/ABI: SystemV (0x0)
+# RV64-NEXT:     ABIVersion: 0
+# RV64-NEXT:     Unused: (00 00 00 00 00 00 00)
+# RV64-NEXT:   }
+# RV64-NEXT:   Type: Executable (0x2)
+# RV64-NEXT:   Machine: EM_RISCV (0xF3)
+# RV64-NEXT:   Version: 1
+# RV64-NEXT:   Entry:
+# RV64-NEXT:   ProgramHeaderOffset: 0x40
+# RV64-NEXT:   SectionHeaderOffset:
+# RV64-NEXT:   Flags [ (0x0)
+# RV64-NEXT:   ]
+# RV64-NEXT:   HeaderSize: 64
+# RV64-NEXT:   ProgramHeaderEntrySize: 56
+# RV64-NEXT:   ProgramHeaderCount:
+# RV64-NEXT:   SectionHeaderEntrySize: 64
+# RV64-NEXT:   SectionHeaderCount:
+# RV64-NEXT:   StringTableSectionIndex:
+# RV64-NEXT: }
+
+.globl _start
+_start: