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Port bufpage.h functions #1982

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merged 6 commits into from
Feb 24, 2025
Merged

Port bufpage.h functions #1982

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be69ef2
add bufpage.h
rebasedming Nov 1, 2024
a89d92c
port bufpage.h macros
rebasedming Nov 2, 2024
b9f6576
fix sizeofpageheaderdata
rebasedming Nov 2, 2024
7d4d5a4
Fix SizeOfPageHeaderData
rebasedming Nov 3, 2024
6765a65
add bufferisvalid
rebasedming Feb 24, 2025
d034565
call BufferIsValid
rebasedming Feb 24, 2025
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174 changes: 173 additions & 1 deletion pgrx-pg-sys/src/port.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -389,4 +389,176 @@ pub unsafe fn MemoryContextSwitchTo(context: crate::MemoryContext) -> crate::Mem
old
}

pub use crate::PGERROR as ERROR;
#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn BufferGetPageSize(buffer: pg_sys::Buffer) -> pg_sys::Size {
// #define BufferGetPageSize(buffer) \
// ( \
// AssertMacro(BufferIsValid(buffer)), \
// (Size)BLCKSZ \
// )
assert!(BufferIsValid(buffer));
pg_sys::BLCKSZ as pg_sys::Size
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn ItemIdGetOffset(item_id: pg_sys::ItemId) -> u32 {
// #define ItemIdGetOffset(itemId) \
// ((itemId)->lp_off)
(*item_id).lp_off()
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageIsValid(page: pg_sys::Page) -> bool {
// #define PageIsValid(page) PointerIsValid(page)
!page.is_null()
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageIsEmpty(page: pg_sys::Page) -> bool {
// #define PageIsEmpty(page) \
// (((PageHeader) (page))->pd_lower <= SizeOfPageHeaderData)
const SizeOfPageHeaderData: pg_sys::Size =
core::mem::offset_of!(pg_sys::PageHeaderData, pd_linp);
let page_header = page as *mut pg_sys::PageHeaderData;
(*page_header).pd_lower <= SizeOfPageHeaderData as u16
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageIsNew(page: pg_sys::Page) -> bool {
// #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
let page_header = page as *mut pg_sys::PageHeaderData;
(*page_header).pd_upper == 0
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetItemId(page: pg_sys::Page, offset: pg_sys::OffsetNumber) -> pg_sys::ItemId {
// #define PageGetItemId(page, offsetNumber) \
// ((ItemId) (&((PageHeader) (page))->pd_linp[(offsetNumber) - 1]))
let page_header = page as *mut pg_sys::PageHeaderData;
(*page_header).pd_linp.as_mut_ptr().add(offset as usize - 1)
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetContents(page: pg_sys::Page) -> *mut ::core::ffi::c_char {
// #define PageGetContents(page) \
// ((char *) (page) + MAXALIGN(SizeOfPageHeaderData))
const SizeOfPageHeaderData: pg_sys::Size =
core::mem::offset_of!(pg_sys::PageHeaderData, pd_linp);
page.add(pg_sys::MAXALIGN(SizeOfPageHeaderData) as usize) as *mut ::core::ffi::c_char
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub fn PageSizeIsValid(page_size: usize) -> bool {
// #define PageSizeIsValid(pageSize) ((pageSize) == BLCKSZ)
page_size == pg_sys::BLCKSZ as usize
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetPageSize(page: pg_sys::Page) -> usize {
// #define PageGetPageSize(page) \
// ((Size) (((PageHeader) (page))->pd_pagesize_version & (uint16) 0xFF00))
let page_header = page as *mut pg_sys::PageHeaderData;
((*page_header).pd_pagesize_version & 0xFF00) as usize
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetPageLayoutVersion(page: pg_sys::Page) -> ::core::ffi::c_char {
// #define PageGetPageLayoutVersion(page) \
// (((PageHeader) (page))->pd_pagesize_version & 0x00FF)
let page_header = page as *mut pg_sys::PageHeaderData;
((*page_header).pd_pagesize_version & 0x00FF) as ::core::ffi::c_char
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageSetPageSizeAndVersion(page: pg_sys::Page, size: u16, version: u8) {
// #define PageSetPageSizeAndVersion(page, size, version) \
// ((PageHeader) (page))->pd_pagesize_version = (size) | (version)
let page_header = page as *mut pg_sys::PageHeaderData;
(*page_header).pd_pagesize_version = size | (version as u16);
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetSpecialSize(page: pg_sys::Page) -> u16 {
// #define PageGetSpecialSize(page) \
// ((uint16) (PageGetPageSize(page) - ((PageHeader)(page))->pd_special))
let page_header = page as *mut pg_sys::PageHeaderData;
PageGetPageSize(page) as u16 - (*page_header).pd_special
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetSpecialPointer(page: pg_sys::Page) -> *mut ::core::ffi::c_char {
// #define PageGetSpecialPointer(page) \
// ((char *) ((char *) (page) + ((PageHeader) (page))->pd_special))
let page_header = page as *mut pg_sys::PageHeaderData;
page.add((*page_header).pd_special as usize) as *mut ::core::ffi::c_char
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetItem(page: pg_sys::Page, item_id: pg_sys::ItemId) -> *mut ::core::ffi::c_char {
// #define PageGetItem(page, itemId) \
// (((char *)(page)) + ItemIdGetOffset(itemId))
page.add(ItemIdGetOffset(item_id) as usize)
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn PageGetMaxOffsetNumber(page: pg_sys::Page) -> pg_sys::OffsetNumber {
// #define PageGetMaxOffsetNumber(page) \
// (((PageHeader) (page))->pd_lower <= SizeOfPageHeaderData ? 0 : \
// ((((PageHeader) (page))->pd_lower - SizeOfPageHeaderData) / sizeof(ItemIdData)))
const SizeOfPageHeaderData: pg_sys::Size =
core::mem::offset_of!(pg_sys::PageHeaderData, pd_linp);
let page_header = page as *mut pg_sys::PageHeaderData;
if (*page_header).pd_lower <= SizeOfPageHeaderData as u16 {
0
} else {
((*page_header).pd_lower - SizeOfPageHeaderData as u16)
/ std::mem::size_of::<pg_sys::ItemIdData>() as u16
}
}

#[allow(non_snake_case)]
#[inline(always)]
#[cfg(any(feature = "pg12", feature = "pg13", feature = "pg14", feature = "pg15"))]
pub unsafe fn BufferIsValid(buffer: pg_sys::Buffer) -> bool {
// static inline bool
// BufferIsValid(Buffer bufnum)
// {
// Assert(bufnum <= NBuffers);
// Assert(bufnum >= -NLocBuffer);

// return bufnum != InvalidBuffer;
// }
assert!(buffer <= pg_sys::NBuffers);
assert!(buffer >= -pg_sys::NLocBuffer);
buffer != pg_sys::InvalidBuffer
}
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