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MC/Mach-O: Start passing in the basic MCAsmLayout object.

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- Also, drop the current location part of AsmLayout, I think I prefer to implement this via explicit symbols.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98240 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-03-11 05:53:33 +00:00
parent 040056fd11
commit 18ff2cced7
2 changed files with 15 additions and 27 deletions
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15
include/llvm/MC/MCAsmLayout.h
View File

@ -22,26 +22,13 @@ class MCAssembler;
/// even during the relaxation process.
class MCAsmLayout {
private:
uint64_t CurrentLocation;
MCAssembler &Assembler;
public:
MCAsmLayout(MCAssembler &_Assembler)
: CurrentLocation(0), Assembler(_Assember) {}
MCAsmLayout(MCAssembler &_Assembler) : Assembler(_Assembler) {}
/// Get the assembler object this is a layout for.
MCAssembler &getAssembler() { return Assembler; }
/// Get the current location value, i.e. that value of the '.' expression.
uin64_t getCurrentLocation() {
return CurrentLocation;
}
/// Set the current location.
void setCurrentLocation(uint64_t Value) {
CurrentLocation = Value;
}
};
} // end namespace llvm

27
lib/MC/MCAssembler.cpp
View File

@ -9,6 +9,7 @@
#define DEBUG_TYPE "assembler"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
@ -510,8 +511,11 @@ public:
unsigned IsPCRel = isFixupKindPCRel(Fixup.Kind);
unsigned Log2Size = getFixupKindLog2Size(Fixup.Kind);
// FIXME: Share layout object.
MCAsmLayout Layout(Asm);
MCValue Target;
if (!Fixup.Value->EvaluateAsRelocatable(Target))
if (!Fixup.Value->EvaluateAsRelocatable(Target, &Layout))
llvm_report_error("expected relocatable expression");
// If this is a difference or a defined symbol plus an offset, then we need
@ -1001,6 +1005,7 @@ MCAssembler::~MCAssembler() {
}
void MCAssembler::LayoutSection(MCSectionData &SD) {
MCAsmLayout Layout(*this);
uint64_t Address = SD.getAddress();
for (MCSectionData::iterator it = SD.begin(), ie = SD.end(); it != ie; ++it) {
@ -1029,21 +1034,17 @@ void MCAssembler::LayoutSection(MCSectionData &SD) {
case MCFragment::FT_Org: {
MCOrgFragment &OF = cast<MCOrgFragment>(F);
MCValue Target;
if (!OF.getOffset().EvaluateAsRelocatable(Target))
llvm_report_error("expected relocatable expression");
if (!Target.isAbsolute())
llvm_unreachable("FIXME: Not yet implemented!");
uint64_t OrgOffset = Target.getConstant();
uint64_t Offset = Address - SD.getAddress();
int64_t TargetLocation;
if (!OF.getOffset().EvaluateAsAbsolute(TargetLocation, &Layout))
llvm_report_error("expected assembly-time absolute expression");
// FIXME: We need a way to communicate this error.
if (OrgOffset < Offset)
llvm_report_error("invalid .org offset '" + Twine(OrgOffset) +
"' (at offset '" + Twine(Offset) + "'");
int64_t Offset = TargetLocation - F.getOffset();
if (Offset < 0)
llvm_report_error("invalid .org offset '" + Twine(TargetLocation) +
"' (at offset '" + Twine(F.getOffset()) + "'");
F.setFileSize(OrgOffset - Offset);
F.setFileSize(Offset);
break;
}