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Make the JIT code emitter properly retry and ask for more memory when it runs

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out of memory, and also make the default memory manager allocate more memory
when it runs out.

Also, switch function stubs and global data over to using the BumpPtrAllocator.

This makes it so the JIT no longer mmaps (or the equivalent on Windows) 16 MB
of memory, and instead allocates in 512K slabs.  I suspect this size could go
lower, especially on embedded platforms, now that more slabs can be allocated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76828 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2009-07-23 00:49:59 +00:00
parent 95eb3ad353
commit 81ce3ed08c
8 changed files with 661 additions and 125 deletions
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9
include/llvm/System/Memory.h
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@ -14,6 +14,7 @@
#ifndef LLVM_SYSTEM_MEMORY_H
#define LLVM_SYSTEM_MEMORY_H
#include "llvm/Support/DataTypes.h"
#include <string>
namespace llvm {
@ -26,11 +27,13 @@ namespace sys {
/// @brief Memory block abstraction.
class MemoryBlock {
public:
MemoryBlock() { }
MemoryBlock(void *addr, size_t size) : Address(addr), Size(size) { }
void *base() const { return Address; }
unsigned size() const { return Size; }
size_t size() const { return Size; }
private:
void *Address; ///< Address of first byte of memory area
unsigned Size; ///< Size, in bytes of the memory area
size_t Size; ///< Size, in bytes of the memory area
friend class Memory;
};
@ -50,7 +53,7 @@ namespace sys {
/// a null memory block and fills in *ErrMsg.
///
/// @brief Allocate Read/Write/Execute memory.
static MemoryBlock AllocateRWX(unsigned NumBytes,
static MemoryBlock AllocateRWX(size_t NumBytes,
const MemoryBlock *NearBlock,
std::string *ErrMsg = 0);