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* Institute a hack for the Sparc call to mmap() to get our generated code to be

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laid out closer to the VM so that calls to library functions (e.g. puts()) and
  callback (e.g.  JITResolver::CompilationCallback) fit into 30 bits of the call
  instruction.
* Abort if architecture is not yet supported (not X86 or Sparc) because it
  likely requires a different set of parameters to mmap() .
* Stop using hard-coded values for page size; use sysconf(_SC_PAGESIZE) instead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6610 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2003-06-04 19:45:25 +00:00
parent e961d9614a
commit 3a55e8aae4
1 changed files with 18 additions and 12 deletions
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30
lib/ExecutionEngine/JIT/JITEmitter.cpp
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@ -67,20 +67,25 @@ MachineCodeEmitter *VM::createEmitter(VM &V) {
// FIXME: This should be rewritten to support a real memory manager for
// executable memory pages!
static void *getMemory(unsigned NumPages) {
#if defined(i386) || defined(__i386__) || defined(__x86__)
static const int fd = 0;
#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
static const int fd = -1;
#else
// This is an unsupported architecture.
static const int fd = 0;
#endif
void *pa;
if (NumPages == 0) return 0;
static const long pageSize = sysconf (_SC_PAGESIZE);
static const long pageSize = sysconf(_SC_PAGESIZE);
#if defined(i386) || defined(__i386__) || defined(__x86__)
pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, fd, 0);
MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); /* fd = 0 */
#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
static unsigned long Counter = 0;
pa = mmap((void*)(0x140000000UL+Counter), pageSize*NumPages,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANON|MAP_FIXED, -1, 0); /* fd = -1 */
Counter += pageSize*NumPages;
std::cerr << "getMemory() returning " << pa << "\n";
#else
std::cerr << "This architecture is not supported by the JIT\n";
abort();
#endif
if (pa == MAP_FAILED) {
perror("mmap");
abort();
@ -118,9 +123,10 @@ void Emitter::emitConstantPool(MachineConstantPool *MCP) {
}
void Emitter::startFunctionStub(const Function &F, unsigned StubSize) {
static const long pageSize = sysconf(_SC_PAGESIZE);
SavedCurBlock = CurBlock; SavedCurByte = CurByte;
// FIXME: this is a huge waste of memory.
CurBlock = (unsigned char *)getMemory((StubSize+4095)/4096);
CurBlock = (unsigned char *)getMemory((StubSize+pageSize-1)/pageSize);
CurByte = CurBlock; // Start writing at the beginning of the fn.
}