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[llvm-cxxfilt] Split and demangle stdin input

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Summary:
Originally, llvm-cxxfilt would treat a line as a single mangled item to be demangled.
If a mangled name appears in the middle of that string, that name would not be demangled.

GNU c++filt  splits and demangles every word  in a  string that is piped to it via stdin.
Prior to this patch llvm-cxxfilt would never split strings  piped to it.
This patch replicates the GNU behavior and splits strings that are piped to it via stdin.

This fixes PR39990

Reviewers: compnerd, jhenderson, davide

Reviewed By: compnerd, jhenderson

Subscribers: erik.pilkington, jhenderson, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D57350

llvm-svn: 353743
This commit is contained in:
Matt Davis 2019-02-11 20:30:53 +00:00
parent 65cb57c3b0
commit 1aa268c431
3 changed files with 33 additions and 7 deletions
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6
test/tools/llvm-cxxfilt/simple.test
View File

@ -1,4 +1,10 @@
RUN: llvm-cxxfilt _Z1fi abc | FileCheck %s
RUN: echo "Mangled _Z1fi and _Z3foov in string." | llvm-cxxfilt \
RUN: | FileCheck %s --check-prefix=CHECK-STRING
RUN: llvm-cxxfilt "CLI remains mangled _Z1fi" \
RUN: | FileCheck %s --check-prefix=CHECK-MANGLED
CHECK: f(int)
CHECK-NEXT: abc
CHECK-STRING: Mangled f(int) and foo() in string.
CHECK-MANGLED: CLI remains mangled _Z1fi

3
test/tools/llvm-cxxfilt/types.test
View File

@ -1,5 +1,6 @@
RUN: llvm-cxxfilt -t f i | FileCheck %s
RUN: echo "f i" | llvm-cxxfilt -t | FileCheck %s --check-prefix="CHECK-STRING"
CHECK: float
CHECK-NEXT: int
CHECK-STRING: float int

31
tools/llvm-cxxfilt/llvm-cxxfilt.cpp
View File

@ -6,6 +6,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringExtras.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/InitLLVM.h"
@ -51,7 +52,7 @@ static cl::alias TypesShort("t", cl::desc("alias for --types"),
static cl::list<std::string>
Decorated(cl::Positional, cl::desc("<mangled>"), cl::ZeroOrMore);
static void demangle(llvm::raw_ostream &OS, const std::string &Mangled) {
static std::string demangle(llvm::raw_ostream &OS, const std::string &Mangled) {
int Status;
const char *Decorated = Mangled.c_str();
@ -72,10 +73,28 @@ static void demangle(llvm::raw_ostream &OS, const std::string &Mangled) {
Undecorated = itaniumDemangle(Decorated + 6, nullptr, nullptr, &Status);
}
OS << (Undecorated ? Undecorated : Mangled) << '\n';
OS.flush();
std::string Result(Undecorated ? Undecorated : Mangled);
free(Undecorated);
return Result;
}
// If 'Split' is true, then 'Mangled' is broken into individual words and each
// word is demangled. Otherwise, the entire string is treated as a single
// mangled item. The result is output to 'OS'.
static void demangleLine(llvm::raw_ostream &OS, StringRef Mangled, bool Split) {
std::string Result;
if (Split) {
SmallVector<StringRef, 16> Words;
SplitString(Mangled, Words);
for (auto Word : Words)
Result += demangle(OS, Word) + ' ';
// Remove the trailing space character.
if (Result.back() == ' ')
Result.pop_back();
} else
Result = demangle(OS, Mangled);
OS << Result << '\n';
OS.flush();
}
int main(int argc, char **argv) {
@ -85,10 +104,10 @@ int main(int argc, char **argv) {
if (Decorated.empty())
for (std::string Mangled; std::getline(std::cin, Mangled);)
demangle(llvm::outs(), Mangled);
demangleLine(llvm::outs(), Mangled, true);
else
for (const auto &Symbol : Decorated)
demangle(llvm::outs(), Symbol);
demangleLine(llvm::outs(), Symbol, false);
return EXIT_SUCCESS;
}