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llvm-objdump: Ignore unreachable blocks when printing the CFG.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-07-25 23:04:36 +00:00
parent f0080016c6
commit 853b0fd623
2 changed files with 21 additions and 2 deletions
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2
tools/llvm-objdump/MCFunction.cpp
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@ -54,6 +54,8 @@ MCFunction::createFunctionFromMC(StringRef Name, const MCDisassembler *DisAsm,
}
}
Splits.insert(Index+Size);
} else if (Desc.isReturn()) {
Splits.insert(Index+Size);
}
Instructions.push_back(MCDecodedInst(Index, Size, Inst));

21
tools/llvm-objdump/llvm-objdump.cpp
View File

@ -27,6 +27,7 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
@ -280,12 +281,28 @@ static void DisassembleInput(const StringRef &Filename) {
Out << "digraph " << f.getName() << " {\n";
Out << "graph [ rankdir = \"LR\" ];\n";
for (MCFunction::iterator i = f.begin(), e = f.end(); i != e; ++i) {
bool hasPreds = false;
// Only print blocks that have predecessors.
// FIXME: Slow.
for (MCFunction::iterator pi = f.begin(), pe = f.end(); pi != pe;
++pi)
for (pi->second->contains(&i->second)) {
hasPreds = true;
break;
}
if (!hasPreds && i != f.begin())
continue;
Out << '"' << (uintptr_t)&i->second << "\" [ label=\"<a>";
// Print instructions.
for (unsigned ii = 0, ie = i->second.getInsts().size(); ii != ie;
++ii) {
IP->printInst(&i->second.getInsts()[ii].Inst, Out);
Out << '|';
// Escape special chars and print the instruction in mnemonic form.
std::string Str;
raw_string_ostream OS(Str);
IP->printInst(&i->second.getInsts()[ii].Inst, OS);
Out << DOT::EscapeString(OS.str()) << '|';
}
Out << "<o>\" shape=\"record\" ];\n";