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Abstraction for VirtualAlloc/VirtualFree.

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This commit is contained in:
Ben Vanik
2015-07-15 19:05:08 -07:00
parent 58c3a1ba79
commit 6cf29b969d
4 changed files with 124 additions and 88 deletions
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75
src/xenia/base/memory_win.cc
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@@ -24,26 +24,69 @@ size_t page_size() {
return value;
}
DWORD ToWin32ProtectFlags(PageAccess access) {
switch (access) {
case PageAccess::kNoAccess:
return PAGE_NOACCESS;
case PageAccess::kReadOnly:
return PAGE_READONLY;
case PageAccess::kReadWrite:
return PAGE_READWRITE;
case PageAccess::kExecuteReadWrite:
return PAGE_EXECUTE_READWRITE;
default:
assert_unhandled_case(access);
return PAGE_NOACCESS;
}
}
void* AllocFixed(void* base_address, size_t length,
AllocationType allocation_type, PageAccess access) {
DWORD alloc_type = 0;
switch (allocation_type) {
case AllocationType::kReserve:
alloc_type = MEM_RESERVE;
break;
case AllocationType::kCommit:
alloc_type = MEM_COMMIT;
break;
case AllocationType::kReserveCommit:
alloc_type = MEM_RESERVE | MEM_COMMIT;
break;
default:
assert_unhandled_case(allocation_type);
break;
}
DWORD protect = ToWin32ProtectFlags(access);
return VirtualAlloc(base_address, length, alloc_type, protect);
}
bool DeallocFixed(void* base_address, size_t length,
DeallocationType deallocation_type) {
DWORD free_type = 0;
switch (deallocation_type) {
case DeallocationType::kRelease:
free_type = MEM_RELEASE;
break;
case DeallocationType::kDecommit:
free_type = MEM_DECOMMIT;
break;
case DeallocationType::kDecommitRelease:
free_type = MEM_RELEASE | MEM_DECOMMIT;
break;
default:
assert_unhandled_case(deallocation_type);
break;
}
return VirtualFree(base_address, length, free_type) ? true : false;
}
bool Protect(void* base_address, size_t length, PageAccess access,
PageAccess* out_old_access) {
if (out_old_access) {
*out_old_access = PageAccess::kNoAccess;
}
DWORD new_protect;
switch (access) {
case PageAccess::kNoAccess:
new_protect = PAGE_NOACCESS;
break;
case PageAccess::kReadOnly:
new_protect = PAGE_READONLY;
break;
case PageAccess::kReadWrite:
new_protect = PAGE_READWRITE;
break;
default:
assert_unhandled_case(access);
break;
}
DWORD new_protect = ToWin32ProtectFlags(access);
DWORD old_protect = 0;
BOOL result = VirtualProtect(base_address, length, new_protect, &old_protect);
if (result) {
@@ -58,6 +101,8 @@ bool Protect(void* base_address, size_t length, PageAccess access,
case PAGE_READWRITE:
*out_old_access = PageAccess::kReadWrite;
break;
case PAGE_EXECUTE_READWRITE:
*out_old_access = PageAccess::kExecuteReadWrite;
default:
assert_unhandled_case(access);
break;