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c835c7ffe2
Unfortunately in LLVM 3.9 LLVMGetAttributeCountAtIndex(func, index) crashes when called with an index that has 0 attributes. Since there's no way to work around this in the C API, add a small C++ wrapper doing so. The only reason this didn't fail before 72559438f92 is that there always are function attributes... Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/20201016001254.w2nfj7gd74jmb5in@alap3.anarazel.de Backpatch: 11-, like 72559438f92
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
/*-------------------------------------------------------------------------
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*
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* llvmjit_wrap.cpp
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* Parts of the LLVM interface not (yet) exposed to C.
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*
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* Copyright (c) 2016-2019, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/backend/lib/llvm/llvmjit_wrap.cpp
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*
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*-------------------------------------------------------------------------
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*/
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extern "C"
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{
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#include "postgres.h"
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}
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#include <llvm-c/Core.h>
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/* Avoid macro clash with LLVM's C++ headers */
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#undef Min
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#include <llvm/IR/Attributes.h>
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#include <llvm/IR/Function.h>
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#include <llvm/MC/SubtargetFeature.h>
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#include <llvm/Support/Host.h>
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#include "jit/llvmjit.h"
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/*
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* C-API extensions.
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*/
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#if defined(HAVE_DECL_LLVMGETHOSTCPUNAME) && !HAVE_DECL_LLVMGETHOSTCPUNAME
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char *LLVMGetHostCPUName(void) {
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return strdup(llvm::sys::getHostCPUName().data());
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}
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#endif
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#if defined(HAVE_DECL_LLVMGETHOSTCPUFEATURES) && !HAVE_DECL_LLVMGETHOSTCPUFEATURES
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char *LLVMGetHostCPUFeatures(void) {
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llvm::SubtargetFeatures Features;
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llvm::StringMap<bool> HostFeatures;
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if (llvm::sys::getHostCPUFeatures(HostFeatures))
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for (auto &F : HostFeatures)
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Features.AddFeature(F.first(), F.second);
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return strdup(Features.getString().c_str());
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}
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#endif
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/*
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* Like LLVM's LLVMGetAttributeCountAtIndex(), works around a bug in LLVM 3.9.
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*
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* In LLVM <= 3.9, LLVMGetAttributeCountAtIndex() segfaults if there are no
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* attributes at an index (fixed in LLVM commit ce9bb1097dc2).
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*/
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unsigned
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LLVMGetAttributeCountAtIndexPG(LLVMValueRef F, uint32 Idx)
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{
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/*
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* This is more expensive, so only do when using a problematic LLVM
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* version.
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*/
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#if LLVM_VERSION_MAJOR < 4
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if (!llvm::unwrap<llvm::Function>(F)->getAttributes().hasAttributes(Idx))
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return 0;
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#endif
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/*
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* There is no nice public API to determine the count nicely, so just
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* always fall back to LLVM's C API.
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*/
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return LLVMGetAttributeCountAtIndex(F, Idx);
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}
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