37 lines
1.5 KiB
C++
37 lines
1.5 KiB
C++
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/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// This file is used to generate #defines for use in assembly source code.
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//
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// The content of this file will be used to compile an object file
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// (generated as human readable assembly text file, not as binary).
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// This text file will then be post-processed by a python script to find
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// and extract the constants and generate the final asm_defines.h header.
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//
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// We use "asm volatile" to generate text that will stand out in the
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// compiler generated intermediate assembly file (eg. ">>FOO 42 0<<").
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// We emit all values as 64-bit integers (which we will printed as text).
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// We also store a flag which specifies whether the constant is negative.
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// Note that "asm volatile" must be inside a method to please the compiler.
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#define ASM_DEFINE(NAME, EXPR) \
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void AsmDefineHelperFor_##NAME() { \
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asm volatile("\n.ascii \">>" #NAME " %0 %1<<\"" \
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:: "i" (static_cast<int64_t>(EXPR)), "i" ((EXPR) < 0 ? 1 : 0)); \
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}
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#include "asm_defines.def"
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