fe6fb910df
clang -fexperimental-relative-c++-abi-vtables might generate `@plt` and `@gotpcrel` specifiers in data directives. The syntax is not used in humand-written assembly code, and is not supported by GNU assembler. Note: the `@plt` in `.word foo@plt` is different from the legacy `call func@plt` (where `@plt` is simply ignored). The `@plt` syntax was selected was simply due to a quirk of AsmParser: the syntax was supported by all targets until I updated it to be an opt-in feature in a0671758eb6e52a758bd1b096a9b421eec60204c RISC-V favors the `%specifier(expr)` syntax following MIPS and Sparc, and we should follow this convention. This PR adds support for `.word %pltpcrel(foo+offset)` and `.word %gotpcrel(foo)`, and drops `@plt` and `@gotpcrel`. * MCValue::SymA can no longer have a SymbolVariant. Add an assert similar to that of AArch64ELFObjectWriter.cpp before https://reviews.llvm.org/D81446 (see my analysis at https://maskray.me/blog/2025-03-16-relocation-generation-in-assemblers if intrigued) * `jump foo@plt, x31` now has a different diagnostic. Pull Request: https://github.com/llvm/llvm-project/pull/132569
47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
//===-- R600AsmPrinter.h - Print R600 assembly code -------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// R600 Assembly printer class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_R600ASMPRINTER_H
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#define LLVM_LIB_TARGET_AMDGPU_R600ASMPRINTER_H
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#include "llvm/CodeGen/AsmPrinter.h"
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namespace llvm {
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class R600AsmPrinter final : public AsmPrinter {
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public:
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explicit R600AsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer);
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StringRef getPassName() const override;
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bool runOnMachineFunction(MachineFunction &MF) override;
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/// Implemented in AMDGPUMCInstLower.cpp
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void emitInstruction(const MachineInstr *MI) override;
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/// Lower the specified LLVM Constant to an MCExpr.
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/// The AsmPrinter::lowerConstantof does not know how to lower
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/// addrspacecast, therefore they should be lowered by this function.
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const MCExpr *lowerConstant(const Constant *CV, const Constant *BaseCV,
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uint64_t Offset) override;
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private:
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void EmitProgramInfoR600(const MachineFunction &MF);
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};
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AsmPrinter *
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createR600AsmPrinterPass(TargetMachine &TM,
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std::unique_ptr<MCStreamer> &&Streamer);
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} // namespace llvm
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#endif // LLVM_LIB_TARGET_AMDGPU_R600ASMPRINTER_H
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