diff options
Diffstat (limited to 'lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp')
| -rw-r--r-- | lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp | 113 |
1 files changed, 21 insertions, 92 deletions
diff --git a/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp b/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp index 226a3b35f2cf..244c2189b455 100644 --- a/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp +++ b/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp @@ -8,7 +8,7 @@ //===----------------------------------------------------------------------===// /// /// \file -/// \brief This file implements the WebAssemblyAsmBackend class. +/// This file implements the WebAssemblyAsmBackend class. /// //===----------------------------------------------------------------------===// @@ -17,7 +17,6 @@ #include "llvm/MC/MCAsmBackend.h" #include "llvm/MC/MCAssembler.h" #include "llvm/MC/MCDirectives.h" -#include "llvm/MC/MCELFObjectWriter.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCFixupKindInfo.h" #include "llvm/MC/MCObjectWriter.h" @@ -26,51 +25,17 @@ #include "llvm/MC/MCWasmObjectWriter.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" + using namespace llvm; namespace { -class WebAssemblyAsmBackendELF final : public MCAsmBackend { - bool Is64Bit; - -public: - explicit WebAssemblyAsmBackendELF(bool Is64Bit) - : MCAsmBackend(), Is64Bit(Is64Bit) {} - ~WebAssemblyAsmBackendELF() override {} - - void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, - const MCValue &Target, MutableArrayRef<char> Data, - uint64_t Value, bool IsPCRel) const override; - - std::unique_ptr<MCObjectWriter> - createObjectWriter(raw_pwrite_stream &OS) const override; - - // No instruction requires relaxation - bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, - const MCRelaxableFragment *DF, - const MCAsmLayout &Layout) const override { - return false; - } - - unsigned getNumFixupKinds() const override { - // We currently just use the generic fixups in MCFixup.h and don't have any - // target-specific fixups. - return 0; - } - - bool mayNeedRelaxation(const MCInst &Inst) const override { return false; } - - void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, - MCInst &Res) const override {} - - bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override; -}; class WebAssemblyAsmBackend final : public MCAsmBackend { bool Is64Bit; public: explicit WebAssemblyAsmBackend(bool Is64Bit) - : MCAsmBackend(), Is64Bit(Is64Bit) {} + : MCAsmBackend(support::little), Is64Bit(Is64Bit) {} ~WebAssemblyAsmBackend() override {} unsigned getNumFixupKinds() const override { @@ -81,10 +46,11 @@ public: void applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef<char> Data, - uint64_t Value, bool IsPCRel) const override; + uint64_t Value, bool IsPCRel, + const MCSubtargetInfo *STI) const override; - std::unique_ptr<MCObjectWriter> - createObjectWriter(raw_pwrite_stream &OS) const override; + std::unique_ptr<MCObjectTargetWriter> + createObjectTargetWriter() const override; // No instruction requires relaxation bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value, @@ -93,51 +59,17 @@ public: return false; } - bool mayNeedRelaxation(const MCInst &Inst) const override { return false; } + bool mayNeedRelaxation(const MCInst &Inst, + const MCSubtargetInfo &STI) const override { + return false; + } void relaxInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, MCInst &Res) const override {} - bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override; + bool writeNopData(raw_ostream &OS, uint64_t Count) const override; }; -bool WebAssemblyAsmBackendELF::writeNopData(uint64_t Count, - MCObjectWriter *OW) const { - for (uint64_t i = 0; i < Count; ++i) - OW->write8(WebAssembly::Nop); - - return true; -} - -void WebAssemblyAsmBackendELF::applyFixup(const MCAssembler &Asm, - const MCFixup &Fixup, - const MCValue &Target, - MutableArrayRef<char> Data, - uint64_t Value, bool IsPCRel) const { - const MCFixupKindInfo &Info = getFixupKindInfo(Fixup.getKind()); - assert(Info.Flags == 0 && "WebAssembly does not use MCFixupKindInfo flags"); - - unsigned NumBytes = alignTo(Info.TargetSize, 8) / 8; - if (Value == 0) - return; // Doesn't change encoding. - - // Shift the value into position. - Value <<= Info.TargetOffset; - - unsigned Offset = Fixup.getOffset(); - assert(Offset + NumBytes <= Data.size() && "Invalid fixup offset!"); - - // For each byte of the fragment that the fixup touches, mask in the - // bits from the fixup value. - for (unsigned i = 0; i != NumBytes; ++i) - Data[Offset + i] |= uint8_t((Value >> (i * 8)) & 0xff); -} - -std::unique_ptr<MCObjectWriter> -WebAssemblyAsmBackendELF::createObjectWriter(raw_pwrite_stream &OS) const { - return createWebAssemblyELFObjectWriter(OS, Is64Bit, 0); -} - const MCFixupKindInfo & WebAssemblyAsmBackend::getFixupKindInfo(MCFixupKind Kind) const { const static MCFixupKindInfo Infos[WebAssembly::NumTargetFixupKinds] = { @@ -158,13 +90,10 @@ WebAssemblyAsmBackend::getFixupKindInfo(MCFixupKind Kind) const { return Infos[Kind - FirstTargetFixupKind]; } -bool WebAssemblyAsmBackend::writeNopData(uint64_t Count, - MCObjectWriter *OW) const { - if (Count == 0) - return true; - +bool WebAssemblyAsmBackend::writeNopData(raw_ostream &OS, + uint64_t Count) const { for (uint64_t i = 0; i < Count; ++i) - OW->write8(WebAssembly::Nop); + OS << char(WebAssembly::Nop); return true; } @@ -173,7 +102,8 @@ void WebAssemblyAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, MutableArrayRef<char> Data, - uint64_t Value, bool IsPCRel) const { + uint64_t Value, bool IsPCRel, + const MCSubtargetInfo *STI) const { const MCFixupKindInfo &Info = getFixupKindInfo(Fixup.getKind()); assert(Info.Flags == 0 && "WebAssembly does not use MCFixupKindInfo flags"); @@ -193,14 +123,13 @@ void WebAssemblyAsmBackend::applyFixup(const MCAssembler &Asm, Data[Offset + i] |= uint8_t((Value >> (i * 8)) & 0xff); } -std::unique_ptr<MCObjectWriter> -WebAssemblyAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const { - return createWebAssemblyWasmObjectWriter(OS, Is64Bit); +std::unique_ptr<MCObjectTargetWriter> +WebAssemblyAsmBackend::createObjectTargetWriter() const { + return createWebAssemblyWasmObjectWriter(Is64Bit); } + } // end anonymous namespace MCAsmBackend *llvm::createWebAssemblyAsmBackend(const Triple &TT) { - if (TT.isOSBinFormatELF()) - return new WebAssemblyAsmBackendELF(TT.isArch64Bit()); return new WebAssemblyAsmBackend(TT.isArch64Bit()); } |