6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-13 04:30:23 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
lib/ExecutionEngine/JIT/JITEmitter.cpp
View File

@ -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.
}