forked from pool/llvm14
4e37c37b16
functions considered as lifetime markers. This should aid dead store elimination to dynamically allocated memory in Rust code. OBS-URL: https://build.opensuse.org/package/show/devel:tools:compiler/llvm14?expand=0&rev=33
91 lines
4.1 KiB
Diff
91 lines
4.1 KiB
Diff
From 59b1d748157ddce5f701dfcaa4fae9a553fc9775 Mon Sep 17 00:00:00 2001
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From: Simonas Kazlauskas <git@kazlauskas.me>
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Date: Sat, 3 Jun 2017 18:55:08 +0300
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Subject: [PATCH] [rust] Add knowledge of __rust_{alloc,realloc,dealloc}
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---
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.../llvm/Analysis/TargetLibraryInfo.def | 13 ++++++++++++
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llvm/lib/Analysis/MemoryBuiltins.cpp | 6 +++++-
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llvm/lib/Analysis/TargetLibraryInfo.cpp | 20 +++++++++++++++++++
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3 files changed, 38 insertions(+), 1 deletion(-)
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diff --git a/llvm/include/llvm/Analysis/TargetLibraryInfo.def b/llvm/include/llvm/Analysis/TargetLibraryInfo.def
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index 9c1abef33b288..70a79112ded85 100644
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--- a/llvm/include/llvm/Analysis/TargetLibraryInfo.def
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+++ b/llvm/include/llvm/Analysis/TargetLibraryInfo.def
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@@ -391,6 +391,19 @@ TLI_DEFINE_STRING_INTERNAL("__powf_finite")
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/// long double __powl_finite(long double x, long double y);
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TLI_DEFINE_ENUM_INTERNAL(powl_finite)
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TLI_DEFINE_STRING_INTERNAL("__powl_finite")
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+
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+TLI_DEFINE_ENUM_INTERNAL(rust_alloc)
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+TLI_DEFINE_STRING_INTERNAL("__rust_alloc")
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+
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+TLI_DEFINE_ENUM_INTERNAL(rust_alloc_zeroed)
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+TLI_DEFINE_STRING_INTERNAL("__rust_alloc_zeroed")
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+
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+TLI_DEFINE_ENUM_INTERNAL(rust_dealloc)
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+TLI_DEFINE_STRING_INTERNAL("__rust_dealloc")
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+
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+TLI_DEFINE_ENUM_INTERNAL(rust_realloc)
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+TLI_DEFINE_STRING_INTERNAL("__rust_realloc")
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+
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/// double __sincospi_stret(double x);
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TLI_DEFINE_ENUM_INTERNAL(sincospi_stret)
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TLI_DEFINE_STRING_INTERNAL("__sincospi_stret")
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diff --git a/llvm/lib/Analysis/MemoryBuiltins.cpp b/llvm/lib/Analysis/MemoryBuiltins.cpp
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index 9e26f292b789a..4b08e6417ebf6 100644
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--- a/llvm/lib/Analysis/MemoryBuiltins.cpp
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+++ b/llvm/lib/Analysis/MemoryBuiltins.cpp
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@@ -111,6 +111,9 @@ static const std::pair<LibFunc, AllocFnsTy> AllocationFnData[] = {
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{LibFunc_strdup, {StrDupLike, 1, -1, -1, -1}},
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{LibFunc_strndup, {StrDupLike, 2, 1, -1, -1}},
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{LibFunc___kmpc_alloc_shared, {MallocLike, 1, 0, -1, -1}},
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+ {LibFunc_rust_alloc, {MallocLike, 2, 0, -1, 1}},
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+ {LibFunc_rust_alloc_zeroed, {CallocLike, 2, 0, -1, 1}},
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+ {LibFunc_rust_realloc, {ReallocLike, 4, 3, -1, 2}},
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// TODO: Handle "int posix_memalign(void **, size_t, size_t)"
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};
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@@ -429,7 +432,8 @@ bool llvm::isLibFreeFunction(const Function *F, const LibFunc TLIFn) {
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TLIFn == LibFunc_ZdlPvjSt11align_val_t || // delete(void*, unsigned long, align_val_t)
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TLIFn == LibFunc_ZdlPvmSt11align_val_t || // delete(void*, unsigned long, align_val_t)
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TLIFn == LibFunc_ZdaPvjSt11align_val_t || // delete[](void*, unsigned int, align_val_t)
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- TLIFn == LibFunc_ZdaPvmSt11align_val_t) // delete[](void*, unsigned long, align_val_t)
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+ TLIFn == LibFunc_ZdaPvmSt11align_val_t || // delete[](void*, unsigned long, align_val_t)
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+ TLIFn == LibFunc_rust_dealloc)
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ExpectedNumParams = 3;
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else
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return false;
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diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
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index 02923c2c7eb14..22d6a5f04152a 100644
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--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
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+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
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@@ -1793,6 +1793,26 @@ bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
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else
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return false;
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}
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+
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+ case LibFunc_rust_alloc:
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+ case LibFunc_rust_alloc_zeroed:
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+ return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
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+ FTy.getParamType(0)->isIntegerTy() &&
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+ FTy.getParamType(1)->isIntegerTy());
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+
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+ case LibFunc_rust_dealloc:
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+ return (NumParams == 3 && FTy.getReturnType()->isVoidTy() &&
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+ FTy.getParamType(0)->isPointerTy() &&
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+ FTy.getParamType(1)->isIntegerTy() &&
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+ FTy.getParamType(2)->isIntegerTy());
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+
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+ case LibFunc_rust_realloc:
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+ return (NumParams == 4 && FTy.getReturnType()->isPointerTy() &&
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+ FTy.getParamType(0)->isPointerTy() &&
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+ FTy.getParamType(1)->isIntegerTy() &&
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+ FTy.getParamType(2)->isIntegerTy() &&
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+ FTy.getParamType(3)->isIntegerTy());
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+
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case LibFunc::NumLibFuncs:
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case LibFunc::NotLibFunc:
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break;
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