RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-19 19:12:56 +02:00
Code Issues Projects Releases Wiki Activity

[MC][mips] Add MipsMCInstrAnalysis class and register it as MC instruction analyzer

Browse Source 
The `MipsMCInstrAnalysis` class overrides the `evaluateBranch` method
and calculates target addresses for branch and calls instructions.
That allows llvm-objdump to print functions' names in branch instructions
in the disassemble mode.

Differential Revision: http://reviews.llvm.org/D18209

llvm-svn: 264309
This commit is contained in:
Simon Atanasyan 2016-03-24 17:18:14 +00:00
parent d336a67dfe
commit 64d083c81a
2 changed files with 72 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCCodeGenInfo.h"
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
@ -129,6 +130,38 @@ createMipsObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
return new MipsTargetELFStreamer(S, STI);
}
namespace {
class MipsMCInstrAnalysis : public MCInstrAnalysis {
public:
MipsMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {}
bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
uint64_t &Target) const override {
unsigned NumOps = Inst.getNumOperands();
if (NumOps == 0)
return false;
switch (Info->get(Inst.getOpcode()).OpInfo[NumOps - 1].OperandType) {
case MCOI::OPERAND_UNKNOWN:
case MCOI::OPERAND_IMMEDIATE:
// jal, bal ...
Target = Inst.getOperand(NumOps - 1).getImm();
return true;
case MCOI::OPERAND_PCREL:
// b, j, beq ...
Target = Addr + Inst.getOperand(NumOps - 1).getImm();
return true;
default:
return false;
}
}
};
}
static MCInstrAnalysis *createMipsMCInstrAnalysis(const MCInstrInfo *Info) {
return new MipsMCInstrAnalysis(Info);
}
extern "C" void LLVMInitializeMipsTargetMC() {
for (Target *T : {&TheMipsTarget, &TheMipselTarget, &TheMips64Target,
&TheMips64elTarget}) {
@ -156,6 +189,9 @@ extern "C" void LLVMInitializeMipsTargetMC() {
// Register the MC subtarget info.
TargetRegistry::RegisterMCSubtargetInfo(*T, createMipsMCSubtargetInfo);
// Register the MC instruction analyzer.
TargetRegistry::RegisterMCInstrAnalysis(*T, createMipsMCInstrAnalysis);
// Register the MCInstPrinter.
TargetRegistry::RegisterMCInstPrinter(*T, createMipsMCInstPrinter);

36
test/MC/Mips/instr-analysis.s Normal file
View File

@ -0,0 +1,36 @@
# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o - \
# RUN: | llvm-objdump -d - | FileCheck %s
# CHECK: foo:
# CHECK-NEXT: 0: 0c 00 00 02 jal 8 <loc1>
# CHECK-NEXT: 4: 00 00 00 00 nop
#
# CHECK: loc1:
# CHECK-NEXT: 8: 0c 00 00 06 jal 24 <loc3>
# CHECK-NEXT: c: 00 00 00 00 nop
#
# CHECK: loc2:
# CHECK-NEXT: 10: 10 00 ff fd b -8 <loc1>
# CHECK-NEXT: 14: 00 00 00 00 nop
#
# CHECK: loc3:
# CHECK-NEXT: 18: 10 43 ff fd beq $2, $3, -8 <loc2>
# CHECK-NEXT: 1c: 00 00 00 00 nop
# CHECK-NEXT: 20: 04 11 ff f9 bal -24 <loc1>
# CHECK-NEXT: 24: 00 00 00 00 nop
# CHECK-NEXT: 28: 08 00 00 04 j 16 <loc2>
.text
.globl foo
.ent foo
foo:
jal loc1
loc1:
jal loc3
loc2:
b loc1
loc3:
beq $2, $3, loc2
bal loc1
j loc2
.end foo