30 lines
1.3 KiB
Text
30 lines
1.3 KiB
Text
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Use int3 trap padding between functions instead of trapsleds with a leading jump.
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Index: include/llvm/CodeGen/AsmPrinter.h
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--- include/llvm/CodeGen/AsmPrinter.h.orig
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+++ include/llvm/CodeGen/AsmPrinter.h
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@@ -434,6 +434,11 @@ class AsmPrinter : public MachineFunctionPass { (publi
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/// correctness.
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void emitAlignment(Align Alignment, const GlobalObject *GV = nullptr) const;
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+ /// Emit an alignment directive to the specified power of two boundary,
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+ /// like emitAlignment, but call emitTrapToAlignment to fill with
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+ /// trap instructions instead of NOPs.
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+ void emitTrapAlignment(Align Alignment, const GlobalObject *GO = nullptr) const;
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+
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/// Lower the specified LLVM Constant to an MCExpr.
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virtual const MCExpr *lowerConstant(const Constant *CV);
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@@ -499,6 +504,11 @@ class AsmPrinter : public MachineFunctionPass { (publi
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virtual void emitInstruction(const MachineInstr *) {
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llvm_unreachable("EmitInstruction not implemented");
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}
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+
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+ /// Emit an alignment directive to the specified power
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+ /// of two boundary, but use Trap instructions for alignment
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+ /// sections that should never be executed.
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+ virtual void emitTrapToAlignment(Align Alignment) const;
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/// Return the symbol for the specified constant pool entry.
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virtual MCSymbol *GetCPISymbol(unsigned CPID) const;
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