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[mips] Implement %hi(sym1 - sym2) and %lo(sym1 - sym2) expressions

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Patch implements %hi(sym1 - sym2) and %lo(sym1 - sym2) expressions for MIPS
by creating target expression class MipsMCExpr.

Patch by Sasa Stankovic.

Differential Revision: http://llvm-reviews.chandlerc.com/D2592


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200783 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Petar Jovanovic
2014-02-04 18:41:57 +00:00
parent 5e47632b8f
commit 7f15e90281
7 changed files with 225 additions and 14 deletions
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17
lib/Target/Mips/AsmParser/MipsAsmParser.cpp
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@@ -7,6 +7,7 @@
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/MipsMCExpr.h"
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "MipsRegisterInfo.h"
#include "MipsTargetStreamer.h"
@@ -1313,6 +1314,18 @@ const MCExpr *MipsAsmParser::evaluateRelocExpr(const MCExpr *Expr,
}
if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
MCSymbolRefExpr::VariantKind VK = getVariantKind(RelocStr);
// Check for %hi(sym1-sym2) and %lo(sym1-sym2) expressions.
if (isa<MCSymbolRefExpr>(BE->getLHS()) && isa<MCSymbolRefExpr>(BE->getRHS())
&& (VK == MCSymbolRefExpr::VK_Mips_ABS_HI
|| VK == MCSymbolRefExpr::VK_Mips_ABS_LO)) {
// Create target expression for %hi(sym1-sym2) and %lo(sym1-sym2).
if (VK == MCSymbolRefExpr::VK_Mips_ABS_HI)
return MipsMCExpr::CreateHi(Expr, getContext());
return MipsMCExpr::CreateLo(Expr, getContext());
}
const MCExpr *LExp = evaluateRelocExpr(BE->getLHS(), RelocStr);
const MCExpr *RExp = evaluateRelocExpr(BE->getRHS(), RelocStr);
Res = MCBinaryExpr::Create(BE->getOpcode(), LExp, RExp, getContext());
@@ -1343,8 +1356,8 @@ bool MipsAsmParser::isEvaluated(const MCExpr *Expr) {
}
case MCExpr::Unary:
return isEvaluated(cast<MCUnaryExpr>(Expr)->getSubExpr());
default:
return false;
case MCExpr::Target:
return true;
}
return false;
}