f049b2c3fc
This patch is essentially an alternative to https://reviews.llvm.org/D75836 and was mentioned by @lhames in a comment. The gist of the issue is that Mach-O has restrictions on which kind of sections are allowed after debug info has been emitted, which is also properly asserted within LLVM. Problem is that stack maps are currently emitted as one of the last sections in each target-specific AsmPrinter so far, which would cause the assertion to trigger. The current approach of special casing for the `__LLVM_STACKMAPS` section is not viable either, as downstream users can overwrite the stackmap format using plugins, which may want to use different sections. This patch fixes the issue by emitting the stack map earlier, right before debug info is emitted. The way this is implemented is by taking the choice when to emit the StackMap away from the target AsmPrinter and doing so in the base class. The only disadvantage of this approach is that the `StackMaps` member is now part of the base class, even for targets that do not support them. This is functionaly not a problem however, as emitting an empty `StackMaps` is a no-op. Differential Revision: https://reviews.llvm.org/D132708
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
//===-- SystemZAsmPrinter.h - SystemZ LLVM assembly printer ----*- 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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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZASMPRINTER_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZASMPRINTER_H
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#include "SystemZMCInstLower.h"
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#include "SystemZTargetMachine.h"
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#include "SystemZTargetStreamer.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/StackMaps.h"
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#include "llvm/MC/MCInstBuilder.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class MCStreamer;
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class MachineInstr;
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class Module;
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class raw_ostream;
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class LLVM_LIBRARY_VISIBILITY SystemZAsmPrinter : public AsmPrinter {
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private:
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MCSymbol *CurrentFnPPA1Sym; // PPA1 Symbol.
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MCSymbol *CurrentFnEPMarkerSym; // Entry Point Marker.
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SystemZTargetStreamer *getTargetStreamer() {
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MCTargetStreamer *TS = OutStreamer->getTargetStreamer();
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assert(TS && "do not have a target streamer");
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return static_cast<SystemZTargetStreamer *>(TS);
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}
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/// Call type information for XPLINK.
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enum class CallType {
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BASR76 = 0, // b'x000' == BASR r7,r6
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BRAS7 = 1, // b'x001' == BRAS r7,ep
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RESVD_2 = 2, // b'x010'
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BRASL7 = 3, // b'x011' == BRASL r7,ep
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RESVD_4 = 4, // b'x100'
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RESVD_5 = 5, // b'x101'
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BALR1415 = 6, // b'x110' == BALR r14,r15
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BASR33 = 7, // b'x111' == BASR r3,r3
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};
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void emitPPA1(MCSymbol *FnEndSym);
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public:
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SystemZAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)), CurrentFnPPA1Sym(nullptr),
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CurrentFnEPMarkerSym(nullptr) {}
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// Override AsmPrinter.
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StringRef getPassName() const override { return "SystemZ Assembly Printer"; }
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void emitInstruction(const MachineInstr *MI) override;
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void emitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) override;
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &OS) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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const char *ExtraCode, raw_ostream &OS) override;
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bool doInitialization(Module &M) override {
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SM.reset();
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return AsmPrinter::doInitialization(M);
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}
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void emitFunctionEntryLabel() override;
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void emitFunctionBodyEnd() override;
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private:
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void emitCallInformation(CallType CT);
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void LowerFENTRY_CALL(const MachineInstr &MI, SystemZMCInstLower &MCIL);
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void LowerSTACKMAP(const MachineInstr &MI);
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void LowerPATCHPOINT(const MachineInstr &MI, SystemZMCInstLower &Lower);
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};
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} // end namespace llvm
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#endif
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