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Add pluggable heap allocator

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This adds the glfwInitAllocator function for specifying a custom memory
allocator to use instead of the C runtime library.

The allocator is a struct of type GLFWallocator with fields
corresponding to malloc, realloc and free, while the internal API
corresponds to calloc, realloc and free.

Heap allocation calls are filtered before reaching the user-provided
functions, so deallocation of NULL and allocations of zero bytes are not
passed on, reallocating NULL is transformed into an allocation and
reallocating to size zero is transformed into deallocation.

The clearing of a new block to zero is performed by the internal
calloc-like function.

Closes #544.
Fixes #1628.
Closes #1947.
This commit is contained in:
Camilla Löwy
2021-08-03 20:53:48 +02:00
parent 4e557437f2
commit 22b586b3d8
33 changed files with 647 additions and 153 deletions
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22
src/cocoa_monitor.m
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@@ -120,7 +120,7 @@ static char* getMonitorName(CGDirectDisplayID displayID, NSScreen* screen)
const CFIndex size =
CFStringGetMaximumSizeForEncoding(CFStringGetLength(nameRef),
kCFStringEncodingUTF8);
char* name = calloc(size + 1, 1);
char* name = _glfw_calloc(size + 1, 1);
CFStringGetCString(nameRef, name, size, kCFStringEncodingUTF8);
CFRelease(info);
@@ -301,7 +301,7 @@ void _glfwPollMonitorsNS(void)
{
uint32_t displayCount;
CGGetOnlineDisplayList(0, NULL, &displayCount);
CGDirectDisplayID* displays = calloc(displayCount, sizeof(CGDirectDisplayID));
CGDirectDisplayID* displays = _glfw_calloc(displayCount, sizeof(CGDirectDisplayID));
CGGetOnlineDisplayList(displayCount, displays, &displayCount);
for (int i = 0; i < _glfw.monitorCount; i++)
@@ -311,7 +311,7 @@ void _glfwPollMonitorsNS(void)
uint32_t disconnectedCount = _glfw.monitorCount;
if (disconnectedCount)
{
disconnected = calloc(_glfw.monitorCount, sizeof(_GLFWmonitor*));
disconnected = _glfw_calloc(_glfw.monitorCount, sizeof(_GLFWmonitor*));
memcpy(disconnected,
_glfw.monitors,
_glfw.monitorCount * sizeof(_GLFWmonitor*));
@@ -363,7 +363,7 @@ void _glfwPollMonitorsNS(void)
monitor->ns.unitNumber = unitNumber;
monitor->ns.screen = screen;
free(name);
_glfw_free(name);
CGDisplayModeRef mode = CGDisplayCopyDisplayMode(displays[i]);
if (CGDisplayModeGetRefreshRate(mode) == 0.0)
@@ -379,8 +379,8 @@ void _glfwPollMonitorsNS(void)
_glfwInputMonitor(disconnected[i], GLFW_DISCONNECTED, 0);
}
free(disconnected);
free(displays);
_glfw_free(disconnected);
_glfw_free(displays);
}
// Change the current video mode
@@ -521,7 +521,7 @@ GLFWvidmode* _glfwPlatformGetVideoModes(_GLFWmonitor* monitor, int* count)
CFArrayRef modes = CGDisplayCopyAllDisplayModes(monitor->ns.displayID, NULL);
const CFIndex found = CFArrayGetCount(modes);
GLFWvidmode* result = calloc(found, sizeof(GLFWvidmode));
GLFWvidmode* result = _glfw_calloc(found, sizeof(GLFWvidmode));
for (CFIndex i = 0; i < found; i++)
{
@@ -569,7 +569,7 @@ GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
@autoreleasepool {
uint32_t size = CGDisplayGammaTableCapacity(monitor->ns.displayID);
CGGammaValue* values = calloc(size * 3, sizeof(CGGammaValue));
CGGammaValue* values = _glfw_calloc(size * 3, sizeof(CGGammaValue));
CGGetDisplayTransferByTable(monitor->ns.displayID,
size,
@@ -587,7 +587,7 @@ GLFWbool _glfwPlatformGetGammaRamp(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
ramp->blue[i] = (unsigned short) (values[i + size * 2] * 65535);
}
free(values);
_glfw_free(values);
return GLFW_TRUE;
} // autoreleasepool
@@ -597,7 +597,7 @@ void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
{
@autoreleasepool {
CGGammaValue* values = calloc(ramp->size * 3, sizeof(CGGammaValue));
CGGammaValue* values = _glfw_calloc(ramp->size * 3, sizeof(CGGammaValue));
for (unsigned int i = 0; i < ramp->size; i++)
{
@@ -612,7 +612,7 @@ void _glfwPlatformSetGammaRamp(_GLFWmonitor* monitor, const GLFWgammaramp* ramp)
values + ramp->size,
values + ramp->size * 2);
free(values);
_glfw_free(values);
} // autoreleasepool
}