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[mips][ias] Only round section sizes when explicitly requested.

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As requested by Rafael Espindola in his post-commit comments on r268036. This
makes the previous behaviour the default while still allowing verification of
IAS.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268496 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Sanders 2016-05-04 13:21:06 +00:00
parent f986e3c06e
commit 37b081dcdc
3 changed files with 26 additions and 14 deletions
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34
lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
View File

@ -21,12 +21,19 @@
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
namespace {
static cl::opt<bool> RoundSectionSizes(
"mips-round-section-sizes", cl::init(false),
cl::desc("Round section sizes up to the section alignment"), cl::Hidden);
} // end anonymous namespace
MipsTargetStreamer::MipsTargetStreamer(MCStreamer &S)
: MCTargetStreamer(S), ModuleDirectiveAllowed(true) {
GPRInfoSet = FPRInfoSet = FrameInfoSet = false;
@ -729,18 +736,23 @@ void MipsTargetELFStreamer::finish() {
DataSection.setAlignment(std::max(16u, DataSection.getAlignment()));
BSSSection.setAlignment(std::max(16u, BSSSection.getAlignment()));
// Make sections sizes a multiple of the alignment.
MCStreamer &OS = getStreamer();
for (MCSection &S : MCA) {
MCSectionELF &Section = static_cast<MCSectionELF &>(S);
if (RoundSectionSizes) {
// Make sections sizes a multiple of the alignment. This is useful for
// verifying the output of IAS against the output of other assemblers but
// it's not necessary to produce a correct object and increases section
// size.
MCStreamer &OS = getStreamer();
for (MCSection &S : MCA) {
MCSectionELF &Section = static_cast<MCSectionELF &>(S);
unsigned Alignment = Section.getAlignment();
if (Alignment) {
OS.SwitchSection(&Section);
if (Section.UseCodeAlign())
OS.EmitCodeAlignment(Alignment, Alignment);
else
OS.EmitValueToAlignment(Alignment, 0, 1, Alignment);
unsigned Alignment = Section.getAlignment();
if (Alignment) {
OS.SwitchSection(&Section);
if (Section.UseCodeAlign())
OS.EmitCodeAlignment(Alignment, Alignment);
else
OS.EmitValueToAlignment(Alignment, 0, 1, Alignment);
}
}
}

2
test/DebugInfo/Mips/delay-slot.ll
View File

@ -19,7 +19,7 @@
; CHECK: 0x000000000000002c 3 0 1 0 0 is_stmt
; CHECK: 0x000000000000003c 4 0 1 0 0 is_stmt
; CHECK: 0x0000000000000048 5 0 1 0 0 is_stmt
; CHECK: 0x0000000000000060 5 0 1 0 0 is_stmt end_sequence
; CHECK: 0x0000000000000058 5 0 1 0 0 is_stmt end_sequence
target datalayout = "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64"

4
test/MC/Mips/section-size.s
View File

@ -1,5 +1,5 @@
# RUN: llvm-mc -triple mips-unknown-linux -filetype=obj %s | \
# RUN: llvm-readobj -sections | FileCheck %s
# RUN: llvm-mc -triple mips-unknown-linux -filetype=obj \
# RUN: -mips-round-section-sizes %s | llvm-readobj -sections | FileCheck %s
.section ".talign1", "ax"
.p2align 4
t1: .byte 1