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[PowerPC] Clean up generation of ha16() / lo16() markers

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When targeting the Darwin assembler, we need to generate markers ha16() and
lo16() to designate the high and low parts of a (symbolic) immediate.  This
is necessary not just for plain symbols, but also for certain symbolic
expression, typically along the lines of ha16(A - B).  The latter doesn't
work when simply using VariantKind flags on the symbol reference.
This is why the current back-end uses hacks (explicitly called out as such
via multiple FIXMEs) in the symbolLo/symbolHi print methods.

This patch uses target-defined MCExpr codes to represent the Darwin
ha16/lo16 constructs, following along the lines of the equivalent solution
used by the ARM back end to handle their :upper16: / :lower16: markers.
This allows us to get rid of special handling both in the symbolLo/symbolHi
print method and in the common code MCExpr::print routine.  Instead, the
ha16 / lo16 markers are printed simply in a custom print routine for the
target MCExpr types.  (As a result, the symbolLo/symbolHi print methods
can now replaced by a single printS16ImmOperand routine that also handles
symbolic operands.)

The patch also provides a EvaluateAsRelocatableImpl routine to handle
ha16/lo16 constructs.  This is not actually used at the moment by any
in-tree code, but is provided as it makes merging into David Fang's
out-of-tree Mach-O object writer simpler.

Since there is no longer any need to treat VK_PPC_GAS_HA16 and
VK_PPC_DARWIN_HA16 differently, they are merged into a single
VK_PPC_ADDR16_HA (and likewise for the _LO16 types).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182616 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2013-05-23 22:26:41 +00:00
parent 8c18a6fe37
commit edaa58ee66
12 changed files with 259 additions and 112 deletions
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25
lib/MC/MCExpr.cpp
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@@ -42,13 +42,6 @@ void MCExpr::print(raw_ostream &OS) const {
// Parenthesize names that start with $ so that they don't look like
// absolute names.
bool UseParens = Sym.getName()[0] == '$';
if (SRE.getKind() == MCSymbolRefExpr::VK_PPC_DARWIN_HA16 ||
SRE.getKind() == MCSymbolRefExpr::VK_PPC_DARWIN_LO16) {
OS << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
UseParens = true;
}
if (UseParens)
OS << '(' << Sym << ')';
else
@@ -65,9 +58,7 @@ void MCExpr::print(raw_ostream &OS) const {
SRE.getKind() == MCSymbolRefExpr::VK_ARM_TARGET2 ||
SRE.getKind() == MCSymbolRefExpr::VK_ARM_PREL31)
OS << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
else if (SRE.getKind() != MCSymbolRefExpr::VK_None &&
SRE.getKind() != MCSymbolRefExpr::VK_PPC_DARWIN_HA16 &&
SRE.getKind() != MCSymbolRefExpr::VK_PPC_DARWIN_LO16)
else if (SRE.getKind() != MCSymbolRefExpr::VK_None)
OS << '@' << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
return;
@@ -207,10 +198,8 @@ StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
case VK_ARM_PREL31: return "(prel31)";
case VK_PPC_TOC: return "tocbase";
case VK_PPC_TOC_ENTRY: return "toc";
case VK_PPC_DARWIN_HA16: return "ha16";
case VK_PPC_DARWIN_LO16: return "lo16";
case VK_PPC_GAS_HA16: return "ha";
case VK_PPC_GAS_LO16: return "l";
case VK_PPC_ADDR16_HA: return "ha";
case VK_PPC_ADDR16_LO: return "l";
case VK_PPC_TPREL16_HA: return "tprel@ha";
case VK_PPC_TPREL16_LO: return "tprel@l";
case VK_PPC_DTPREL16_HA: return "dtprel@ha";
@@ -290,10 +279,10 @@ MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
.Case("imgrel", VK_COFF_IMGREL32)
.Case("SECREL32", VK_SECREL)
.Case("secrel32", VK_SECREL)
.Case("HA", VK_PPC_GAS_HA16)
.Case("ha", VK_PPC_GAS_HA16)
.Case("L", VK_PPC_GAS_LO16)
.Case("l", VK_PPC_GAS_LO16)
.Case("HA", VK_PPC_ADDR16_HA)
.Case("ha", VK_PPC_ADDR16_HA)
.Case("L", VK_PPC_ADDR16_LO)
.Case("l", VK_PPC_ADDR16_LO)
.Case("TOCBASE", VK_PPC_TOC)
.Case("tocbase", VK_PPC_TOC)
.Case("TOC", VK_PPC_TOC_ENTRY)