ca02fab7e7
- This patch attempts to implement the location counter syntax (*) for the HLASM variant for PC-relative instructions.
- In the HLASM variant, for purely constant relocatable values, we expect a * token preceding it, with special support for " *" which is parsed as "<pc-rel-insn 0>"
- For combinations of absolute values and relocatable values, we don't expect the "*" preceding the token.
When you have a " * " what’s accepted is:
```
*<space>.*{.*} -> <pc-rel-insn> 0
*[+|-][constant-value] -> <pc-rel-insn> [+|-]constant-value
```
When you don’t have a " * " what’s accepted is:
```
brasl 1,func is allowed (MCSymbolRef type)
brasl 1,func+4 is allowed (MCBinary type)
brasl 1,4+func is allowed (MCBinary type)
brasl 1,-4+func is allowed (MCBinary type)
brasl 1,func-4 is allowed (MCBinary type)
brasl 1,*func is not allowed (* cannot be used for non-MCConstantExprs)
brasl 1,*+func is not allowed (* cannot be used for non-MCConstantExprs)
brasl 1,*+func+4 is not allowed (* cannot be used for non-MCConstantExprs)
brasl 1,*+4+func is not allowed (* cannot be used for non-MCConstantExprs)
brasl 1,*-4+8+func is not allowed (* cannot be used for non-MCConstantExprs)
```
Reviewed By: Kai
Differential Revision: https://reviews.llvm.org/D100987
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
//===-- SystemZMCAsmInfo.cpp - SystemZ asm properties ---------------------===//
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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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#include "SystemZMCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSectionELF.h"
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using namespace llvm;
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SystemZMCAsmInfo::SystemZMCAsmInfo(const Triple &TT) {
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CodePointerSize = 8;
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CalleeSaveStackSlotSize = 8;
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IsLittleEndian = false;
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AssemblerDialect = TT.isOSzOS() ? AD_HLASM : AD_ATT;
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MaxInstLength = 6;
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CommentString = AssemblerDialect == AD_HLASM ? "*" : "#";
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RestrictCommentStringToStartOfStatement = (AssemblerDialect == AD_HLASM);
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AllowAdditionalComments = (AssemblerDialect == AD_ATT);
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AllowAtAtStartOfIdentifier = (AssemblerDialect == AD_HLASM);
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AllowDollarAtStartOfIdentifier = (AssemblerDialect == AD_HLASM);
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AllowHashAtStartOfIdentifier = (AssemblerDialect == AD_HLASM);
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DotIsPC = (AssemblerDialect == AD_ATT);
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StarIsPC = (AssemblerDialect == AD_HLASM);
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ZeroDirective = "\t.space\t";
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Data64bitsDirective = "\t.quad\t";
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UsesELFSectionDirectiveForBSS = true;
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SupportsDebugInformation = true;
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ExceptionsType = ExceptionHandling::DwarfCFI;
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}
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