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add a "MCStreamer::EmitFill" method, and move the default implementation

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(which just iteratively emits bytes) to MCStreamer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93888 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-19 18:45:47 +00:00
parent f03ffd13f8
commit ddf6bdde44
3 changed files with 15 additions and 2 deletions
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5
include/llvm/MC/MCStreamer.h
View File

@ -168,6 +168,11 @@ namespace llvm {
/// match a native machine width.
virtual void EmitValue(const MCExpr *Value, unsigned Size) = 0;
/// EmitFill - Emit NumBytes bytes worth of the value specified by
/// FillValue. This implements directives such as '.space'.
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue = 0);
/// EmitValueToAlignment - Emit some number of copies of @param Value until
/// the byte alignment @param ByteAlignment is reached.
///

9
lib/MC/MCStreamer.cpp
View File

@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCExpr.h"
using namespace llvm;
@ -16,3 +17,11 @@ MCStreamer::MCStreamer(MCContext &_Context) : Context(_Context), CurSection(0) {
MCStreamer::~MCStreamer() {
}
/// EmitFill - Emit NumBytes bytes worth of the value specified by
/// FillValue. This implements directives such as '.space'.
void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
EmitValue(E, 1);
}

3
tools/llvm-mc/AsmParser.cpp
View File

@ -1041,8 +1041,7 @@ bool AsmParser::ParseDirectiveSpace() {
return TokError("invalid number of bytes in '.space' directive");
// FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
Out.EmitValue(MCConstantExpr::Create(FillExpr, getContext()), 1);
Out.EmitFill(NumBytes, FillExpr);
return false;
}