Skip to content

Add external call conventions for OCaml #11

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Aug 6, 2025
Merged

Add external call conventions for OCaml #11

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions llvm/include/llvm/IR/CallingConv.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,9 @@ namespace CallingConv {
/// Calling convention for OCaml
OCaml = 104,

/// Special case of the C calling convention for calling from OCaml
OCaml_C_Call = 105,

/// The highest possible ID. Must be some 2^k - 1.
MaxID = 1023
};
Expand Down
10 changes: 10 additions & 0 deletions llvm/lib/Target/X86/X86CallingConv.td
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -735,6 +735,15 @@ def CC_X86_64_OCaml : CallingConv<[
]>>
]>;

def CC_X86_64_OCaml_C_Call : CallingConv<[
// OCaml wraps C calls with another function that transfers stack arguments.
// RAX contains the function address, and R12 contains the size of the stack arguments.
CCIfType<[i64], CCAssignToReg<[RAX, R12]>>,

// Follow C convention normally otherwise
CCDelegateTo<CC_X86_64_C>
]>;

def CC_X86_64_GHC : CallingConv<[
// Promote i8/i16/i32 arguments to i64.
CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
Expand Down Expand Up @@ -1138,6 +1147,7 @@ def CC_X86_64 : CallingConv<[
CCIfCC<"CallingConv::X86_RegCall", CCDelegateTo<CC_X86_SysV64_RegCall>>,
CCIfCC<"CallingConv::X86_INTR", CCCustom<"CC_X86_Intr">>,
CCIfCC<"CallingConv::OCaml", CCDelegateTo<CC_X86_64_OCaml>>,
CCIfCC<"CallingConv::OCaml_C_Call", CCDelegateTo<CC_X86_64_OCaml_C_Call>>,

// Mingw64 and native Win64 use Win64 CC
CCIfSubtarget<"isTargetWin64()", CCDelegateTo<CC_X86_Win64_C>>,
Expand Down