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llvm-project/lld/test/COFF/Inputs/hello64.asm

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COFF: Add a new PE/COFF port. This is an initial patch for a section-based COFF linker. The patch has 2300 lines of code including comments and blank lines. Before diving into details, you want to start from reading README because it should give you an overview of the design. All important things are written in the README file, so I write summary here. - The linker is already able to self-link on Windows. - It's significantly faster than the existing implementation. The existing one takes 5 seconds to link LLD on my machine, while the new one only takes 1.2 seconds, even though the new one is not multi-threaded yet. (And a proof-of-concept multi- threaded version was able to link it in 0.5 seconds.) - It uses much less memory (250MB vs. 2GB virtual memory space to self-host). - IMHO the new code is much simpler and easier to read than the existing PE/COFF port. http://reviews.llvm.org/D10036 llvm-svn: 238458
2015-05-29 03:09:30 +08:00
;; ml64 hello64.asm /link /subsystem:windows /defaultlib:kernel32 \
;; /defaultlib:user32 /out:hello64.exe /entry:main
extern ExitProcess : PROC
extern MessageBoxA : PROC
COFF: Support import-by-ordinal DLL imports. Symbols exported by DLLs can be imported not by name but by small number or ordinal. Usually, symbols have both ordinals and names, and in that case ordinals are called "hints" and used by the loader as hints. However, symbols can have only ordinals. They are called import-by-ordinal symbols. You need to manage ordinals by hand so that they will never change if you choose to use the feature. But it's supposed to make dynamic linking faster because it needs no string comparison. Not sure if that claim still stands in year 2015, though. Anyways, the feature exists, and this patch implements that. llvm-svn: 238780
2015-06-02 05:05:27 +08:00
extern ImportByOrdinal: PROC
COFF: Add a new PE/COFF port. This is an initial patch for a section-based COFF linker. The patch has 2300 lines of code including comments and blank lines. Before diving into details, you want to start from reading README because it should give you an overview of the design. All important things are written in the README file, so I write summary here. - The linker is already able to self-link on Windows. - It's significantly faster than the existing implementation. The existing one takes 5 seconds to link LLD on my machine, while the new one only takes 1.2 seconds, even though the new one is not multi-threaded yet. (And a proof-of-concept multi- threaded version was able to link it in 0.5 seconds.) - It uses much less memory (250MB vs. 2GB virtual memory space to self-host). - IMHO the new code is much simpler and easier to read than the existing PE/COFF port. http://reviews.llvm.org/D10036 llvm-svn: 238458
2015-05-29 03:09:30 +08:00
.data
caption db 'Hello', 0
message db 'Hello World!', 0
.code
main PROC
sub rsp,28h
mov rcx, 0
lea rdx, message
lea r8, caption
mov r9d, 0
call MessageBoxA
mov ecx, 0
call ExitProcess
COFF: Support import-by-ordinal DLL imports. Symbols exported by DLLs can be imported not by name but by small number or ordinal. Usually, symbols have both ordinals and names, and in that case ordinals are called "hints" and used by the loader as hints. However, symbols can have only ordinals. They are called import-by-ordinal symbols. You need to manage ordinals by hand so that they will never change if you choose to use the feature. But it's supposed to make dynamic linking faster because it needs no string comparison. Not sure if that claim still stands in year 2015, though. Anyways, the feature exists, and this patch implements that. llvm-svn: 238780
2015-06-02 05:05:27 +08:00
call ImportByOrdinal
COFF: Add a new PE/COFF port. This is an initial patch for a section-based COFF linker. The patch has 2300 lines of code including comments and blank lines. Before diving into details, you want to start from reading README because it should give you an overview of the design. All important things are written in the README file, so I write summary here. - The linker is already able to self-link on Windows. - It's significantly faster than the existing implementation. The existing one takes 5 seconds to link LLD on my machine, while the new one only takes 1.2 seconds, even though the new one is not multi-threaded yet. (And a proof-of-concept multi- threaded version was able to link it in 0.5 seconds.) - It uses much less memory (250MB vs. 2GB virtual memory space to self-host). - IMHO the new code is much simpler and easier to read than the existing PE/COFF port. http://reviews.llvm.org/D10036 llvm-svn: 238458
2015-05-29 03:09:30 +08:00
main ENDP
END