kernel/vm_manager: Use const where applicable

Makes our immutable state explicit.

src/core/hle/kernel/svc.cpp

@@ -267,7 +267,7 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
     LOG_TRACE(Kernel_SVC, "called info_id=0x{:X}, info_sub_id=0x{:X}, handle=0x{:08X}", info_id,
               info_sub_id, handle);
 
-    auto& vm_manager = Core::CurrentProcess()->vm_manager;
+    const auto& vm_manager = Core::CurrentProcess()->vm_manager;
 
     switch (static_cast<GetInfoType>(info_id)) {
     case GetInfoType::AllowedCpuIdBitmask:

src/core/hle/kernel/vm_manager.cpp

@@ -175,9 +175,9 @@ VMManager::VMAIter VMManager::Unmap(VMAIter vma_handle) {
 
 ResultCode VMManager::UnmapRange(VAddr target, u64 size) {
     CASCADE_RESULT(VMAIter vma, CarveVMARange(target, size));
-    VAddr target_end = target + size;
+    const VAddr target_end = target + size;
 
-    VMAIter end = vma_map.end();
+    const VMAIter end = vma_map.end();
     // The comparison against the end of the range must be done using addresses since VMAs can be
     // merged during this process, causing invalidation of the iterators.
     while (vma != end && vma->second.base < target_end) {
@@ -207,9 +207,9 @@ VMManager::VMAHandle VMManager::Reprotect(VMAHandle vma_handle, VMAPermission ne
 
 ResultCode VMManager::ReprotectRange(VAddr target, u64 size, VMAPermission new_perms) {
     CASCADE_RESULT(VMAIter vma, CarveVMARange(target, size));
-    VAddr target_end = target + size;
+    const VAddr target_end = target + size;
 
-    VMAIter end = vma_map.end();
+    const VMAIter end = vma_map.end();
     // The comparison against the end of the range must be done using addresses since VMAs can be
     // merged during this process, causing invalidation of the iterators.
     while (vma != end && vma->second.base < target_end) {
@@ -258,14 +258,14 @@ ResultVal<VMManager::VMAIter> VMManager::CarveVMA(VAddr base, u64 size) {
         return ERR_INVALID_ADDRESS;
     }
 
-    VirtualMemoryArea& vma = vma_handle->second;
+    const VirtualMemoryArea& vma = vma_handle->second;
     if (vma.type != VMAType::Free) {
         // Region is already allocated
         return ERR_INVALID_ADDRESS_STATE;
     }
 
-    VAddr start_in_vma = base - vma.base;
-    VAddr end_in_vma = start_in_vma + size;
+    const VAddr start_in_vma = base - vma.base;
+    const VAddr end_in_vma = start_in_vma + size;
 
     if (end_in_vma > vma.size) {
         // Requested allocation doesn't fit inside VMA
@@ -288,13 +288,13 @@ ResultVal<VMManager::VMAIter> VMManager::CarveVMARange(VAddr target, u64 size) {
     ASSERT_MSG((size & Memory::PAGE_MASK) == 0, "non-page aligned size: 0x{:016X}", size);
     ASSERT_MSG((target & Memory::PAGE_MASK) == 0, "non-page aligned base: 0x{:016X}", target);
 
-    VAddr target_end = target + size;
+    const VAddr target_end = target + size;
     ASSERT(target_end >= target);
     ASSERT(target_end <= MAX_ADDRESS);
     ASSERT(size > 0);
 
     VMAIter begin_vma = StripIterConstness(FindVMA(target));
-    VMAIter i_end = vma_map.lower_bound(target_end);
+    const VMAIter i_end = vma_map.lower_bound(target_end);
     for (auto i = begin_vma; i != i_end; ++i) {
         if (i->second.type == VMAType::Free) {
             return ERR_INVALID_ADDRESS_STATE;
@@ -346,7 +346,7 @@ VMManager::VMAIter VMManager::SplitVMA(VMAIter vma_handle, u64 offset_in_vma) {
 }
 
 VMManager::VMAIter VMManager::MergeAdjacent(VMAIter iter) {
-    VMAIter next_vma = std::next(iter);
+    const VMAIter next_vma = std::next(iter);
     if (next_vma != vma_map.end() && iter->second.CanBeMergedWith(next_vma->second)) {
         iter->second.size += next_vma->second.size;
         vma_map.erase(next_vma);
@@ -382,22 +382,22 @@ void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
     }
 }
 
-u64 VMManager::GetTotalMemoryUsage() {
+u64 VMManager::GetTotalMemoryUsage() const {
     LOG_WARNING(Kernel, "(STUBBED) called");
     return 0xF8000000;
 }
 
-u64 VMManager::GetTotalHeapUsage() {
+u64 VMManager::GetTotalHeapUsage() const {
     LOG_WARNING(Kernel, "(STUBBED) called");
     return 0x0;
 }
 
-VAddr VMManager::GetAddressSpaceBaseAddr() {
+VAddr VMManager::GetAddressSpaceBaseAddr() const {
     LOG_WARNING(Kernel, "(STUBBED) called");
     return 0x8000000;
 }
 
-u64 VMManager::GetAddressSpaceSize() {
+u64 VMManager::GetAddressSpaceSize() const {
     LOG_WARNING(Kernel, "(STUBBED) called");
     return MAX_ADDRESS;
 }

src/core/hle/kernel/vm_manager.h

@@ -190,16 +190,16 @@ public:
     void LogLayout() const;
 
     /// Gets the total memory usage, used by svcGetInfo
-    u64 GetTotalMemoryUsage();
+    u64 GetTotalMemoryUsage() const;
 
     /// Gets the total heap usage, used by svcGetInfo
-    u64 GetTotalHeapUsage();
+    u64 GetTotalHeapUsage() const;
 
     /// Gets the total address space base address, used by svcGetInfo
-    VAddr GetAddressSpaceBaseAddr();
+    VAddr GetAddressSpaceBaseAddr() const;
 
     /// Gets the total address space address size, used by svcGetInfo
-    u64 GetAddressSpaceSize();
+    u64 GetAddressSpaceSize() const;
 
     /// Each VMManager has its own page table, which is set as the main one when the owning process
     /// is scheduled.