[Openmp-commits] [clang] [llvm] [openmp] [OpenMP] support for Emissary APIs as discussed in 89169 (PR #175265)

[via Openmp-commits]

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+//===------- CGEmitEmissaryExec.cpp - Codegen for _emissary_exec --==------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// EmitEmissaryExec:
+//
+// When a device call to the varadic function _emissary_exec is encountered
+// (in CGExpr.cpp) EmitEmissaryExec does these steps:
+//
+// 1. If string lens are runtime dependent, Emit code to determine runtime len.
+// 2. Emits call to allocate memory __llvm_emissary_premalloc,
+// 3. Emit stores of each arg into arg buffer,
+// 4. Emits call to function __llvm_emissary_rpc or __llvm_emissary_rpc_dm
+//
+// The arg buffer is a struct that contains the length, number of args, an
+// array of 4-byte keys that represent the type of of each arg, an array of
+// aligned "data" values for each arg, and finally the runtime string values.
+// If an arg is a string the data value is the runtime length of the string.
+// Each 4-byte key contains the llvm type ID and the number of bits for the
+// type. encoded by the macro _PACK_TY_BITLEN(x,y) ((uint32_t)x << 16) |
+// ((uint32_t)y)
+//
+//===----------------------------------------------------------------------===//
+
+#include "../../../clang/lib/Headers/EmissaryIds.h"
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LunNova wrote:

The circuitous `../../../clang` include path here may break standalone (non-monorepo) clang builds.

https://github.com/llvm/llvm-project/pull/175265