6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-12 02:33:33 +00:00
Code Issues Projects Releases Wiki Activity

Add a function to check if an argument list is too long.

Browse Source 
This will be used in clang to decide if it should create an @file or not. It
will be tested on the clang side.

Patch by Nathan Froyd.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179285 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-04-11 14:06:34 +00:00
parent 305e3b277c
commit 845a932af7
3 changed files with 45 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/llvm/Support/Program.h
View File

@ -14,6 +14,7 @@
#ifndef LLVM_SUPPORT_PROGRAM_H
#define LLVM_SUPPORT_PROGRAM_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Path.h"
namespace llvm {
@ -140,6 +141,10 @@ namespace sys {
/// @}
};
// Return true if the given arguments fit within system-specific
// argument length limits.
bool argumentsFitWithinSystemLimits(ArrayRef<const char*> Args);
}
}

24
lib/Support/Unix/Program.inc
View File

@ -32,6 +32,9 @@
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_POSIX_SPAWN
#include <spawn.h>
#if !defined(__APPLE__)
@ -409,4 +412,25 @@ error_code Program::ChangeStderrToBinary(){
return make_error_code(errc::success);
}
bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
static long ArgMax = sysconf(_SC_ARG_MAX);
// System says no practical limit.
if (ArgMax == -1)
return true;
// Conservatively account for space required by environment variables.
ArgMax /= 2;
size_t ArgLength = 0;
for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
I != E; ++I) {
ArgLength += strlen(*I) + 1;
if (ArgLength > size_t(ArgMax)) {
return false;
}
}
return true;
}
}

16
lib/Support/Windows/Program.inc
View File

@ -396,4 +396,20 @@ error_code Program::ChangeStderrToBinary(){
return make_error_code(errc::success);
}
bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
// The documented max length of the command line passed to CreateProcess.
static const size_t MaxCommandStringLength = 32768;
size_t ArgLength = 0;
for (ArrayRef<const char*>::iterator I = Args.begin(), E = Args.end();
I != E; ++I) {
// Account for the trailing space for every arg but the last one and the
// trailing NULL of the last argument.
ArgLength += ArgLenWithQuotes(*I) + 1;
if (ArgLength > MaxCommandStringLength) {
return false;
}
}
return true;
}
}