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bpftrace/0002-Drop-support-for-LLVM-12-and-below.patch

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From 08a7d5c48bc36c4876e7de62323a8860e886f7a8 Mon Sep 17 00:00:00 2001
From: Alastair Robertson <ajor@meta.com>
Date: Wed, 17 Jul 2024 08:03:30 -0700
Subject: [PATCH 1/3] Drop support for LLVM 12 and below
LLVM 11 and below have been untested for a while.
Dropping LLVM 12 allows us to upgrade to C++ 20.
---
.github/workflows/ci.yml | 5 --
CHANGELOG.md | 2 +
CMakeLists.txt | 2 +-
flake.nix | 2 -
src/ast/irbuilderbpf.cpp | 18 +-----
src/ast/irbuilderbpf.h | 19 -------
src/ast/passes/codegen_llvm.cpp | 4 +-
src/clang_parser.cpp | 99 +--------------------------------
tests/clang_parser.cpp | 5 --
tests/data/CMakeLists.txt | 8 +--
tests/testprogs/CMakeLists.txt | 5 --
11 files changed, 8 insertions(+), 161 deletions(-)
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6b87ea3c..a37b7bdc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,11 +28,6 @@ jobs:
strategy:
matrix:
env:
- - NAME: LLVM 12 Release
- CMAKE_BUILD_TYPE: Release
- NIX_TARGET: .#bpftrace-llvm12
- TOOLS_TEST_OLDVERSION: tcpdrop.bt
- TOOLS_TEST_DISABLE: biosnoop.bt
- NAME: LLVM 13 Release
CMAKE_BUILD_TYPE: Release
NIX_TARGET: .#bpftrace-llvm13
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7fa1fe14..c223b4e5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to
#### Changed
#### Deprecated
#### Removed
+- Drop support for LLVM 12 and below
+ - [#3325](https://github.com/bpftrace/bpftrace/pull/3325)
#### Fixed
#### Security
#### Docs
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e03ca7d..05ca8dcc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -148,7 +148,7 @@ else()
find_package(LLVM REQUIRED)
endif()
-set(MIN_LLVM_MAJOR 6)
+set(MIN_LLVM_MAJOR 13)
set(MAX_LLVM_MAJOR 18)
if((${LLVM_VERSION_MAJOR} VERSION_LESS ${MIN_LLVM_MAJOR}) OR (${LLVM_VERSION_MAJOR} VERSION_GREATER ${MAX_LLVM_MAJOR}))
diff --git a/flake.nix b/flake.nix
index 6202e372..9931a2a5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -145,7 +145,6 @@
bpftrace-llvm15 = mkBpftrace pkgs.llvmPackages_15;
bpftrace-llvm14 = mkBpftrace pkgs.llvmPackages_14;
bpftrace-llvm13 = mkBpftrace pkgs.llvmPackages_13;
- bpftrace-llvm12 = mkBpftrace pkgs.llvmPackages_12;
# Self-contained static binary with all dependencies
appimage = nix-appimage.mkappimage.${system} {
@@ -192,7 +191,6 @@
bpftrace-llvm15 = mkBpftraceDevShell self.packages.${system}.bpftrace-llvm15;
bpftrace-llvm14 = mkBpftraceDevShell self.packages.${system}.bpftrace-llvm14;
bpftrace-llvm13 = mkBpftraceDevShell self.packages.${system}.bpftrace-llvm13;
- bpftrace-llvm12 = mkBpftraceDevShell self.packages.${system}.bpftrace-llvm12;
};
});
}
diff --git a/src/ast/irbuilderbpf.cpp b/src/ast/irbuilderbpf.cpp
index deccf4a8..89434075 100644
--- a/src/ast/irbuilderbpf.cpp
+++ b/src/ast/irbuilderbpf.cpp
@@ -15,14 +15,6 @@
#include "log.h"
#include "utils.h"
-#if LLVM_VERSION_MAJOR >= 10
-#define CREATE_MEMSET(ptr, val, size, align) \
- CreateMemSet((ptr), (val), (size), MaybeAlign((align)))
-#else
-#define CREATE_MEMSET(ptr, val, size, align) \
- CreateMemSet((ptr), (val), (size), (align))
-#endif
-
namespace libbpf {
#include "libbpf/bpf.h"
} // namespace libbpf
@@ -247,7 +239,7 @@ void IRBuilderBPF::CreateMemsetBPF(Value *ptr, Value *val, uint32_t size)
// So only use helper based memset when we really need it. And that's when
// we're memset()ing off-stack. We know it's off stack b/c 512 is program
// stack limit.
- CREATE_MEMSET(ptr, val, getInt64(size), 1);
+ CreateMemSet(ptr, val, getInt64(size), MaybeAlign(1));
}
}
@@ -347,11 +339,7 @@ CallInst *IRBuilderBPF::createCall(FunctionType *callee_type,
ArrayRef<Value *> args,
const Twine &Name)
{
-#if LLVM_VERSION_MAJOR >= 11
return CreateCall(callee_type, callee, args, Name);
-#else
- return CreateCall(callee, args, Name);
-#endif
}
Value *IRBuilderBPF::GetMapVar(const std::string &map_name)
@@ -2445,11 +2433,7 @@ StoreInst *IRBuilderBPF::createAlignedStore(Value *val,
Value *ptr,
unsigned int align)
{
-#if LLVM_VERSION_MAJOR < 10
- return CreateAlignedStore(val, ptr, align);
-#else
return CreateAlignedStore(val, ptr, MaybeAlign(align));
-#endif
}
void IRBuilderBPF::CreateProbeRead(Value *ctx,
diff --git a/src/ast/irbuilderbpf.h b/src/ast/irbuilderbpf.h
index 6a42c003..e9b3b124 100644
--- a/src/ast/irbuilderbpf.h
+++ b/src/ast/irbuilderbpf.h
@@ -11,32 +11,13 @@
#include "bpftrace.h"
#include "types.h"
-#if LLVM_VERSION_MAJOR >= 5 && LLVM_VERSION_MAJOR < 7
-#define CREATE_MEMCPY(dst, src, size, algn) \
- CreateMemCpy((dst), (src), (size), (algn))
-#define CREATE_MEMCPY_VOLATILE(dst, src, size, algn) \
- CreateMemCpy((dst), (src), (size), (algn), true)
-#elif LLVM_VERSION_MAJOR >= 7 && LLVM_VERSION_MAJOR < 10
-#define CREATE_MEMCPY(dst, src, size, algn) \
- CreateMemCpy((dst), (algn), (src), (algn), (size))
-#define CREATE_MEMCPY_VOLATILE(dst, src, size, algn) \
- CreateMemCpy((dst), (algn), (src), (algn), (size), true)
-#elif LLVM_VERSION_MAJOR >= 10
#define CREATE_MEMCPY(dst, src, size, algn) \
CreateMemCpy((dst), MaybeAlign(algn), (src), MaybeAlign(algn), (size))
#define CREATE_MEMCPY_VOLATILE(dst, src, size, algn) \
CreateMemCpy((dst), MaybeAlign(algn), (src), MaybeAlign(algn), (size), true)
-#else
-#error Unsupported LLVM version
-#endif
-#if LLVM_VERSION_MAJOR >= 13
#define CREATE_ATOMIC_RMW(op, ptr, val, align, order) \
CreateAtomicRMW((op), (ptr), (val), MaybeAlign((align)), (order))
-#else
-#define CREATE_ATOMIC_RMW(op, ptr, val, align, order) \
- CreateAtomicRMW((op), (ptr), (val), (order))
-#endif
#if LLVM_VERSION_MAJOR >= 15
#define GET_PTR_TY() getPtrTy()
diff --git a/src/ast/passes/codegen_llvm.cpp b/src/ast/passes/codegen_llvm.cpp
index 562ec65f..f4314023 100644
--- a/src/ast/passes/codegen_llvm.cpp
+++ b/src/ast/passes/codegen_llvm.cpp
@@ -3727,10 +3727,8 @@ void CodegenLLVM::emit(raw_pwrite_stream &stream)
#if LLVM_VERSION_MAJOR >= 18
auto type = CodeGenFileType::ObjectFile;
-#elif LLVM_VERSION_MAJOR >= 10
- auto type = llvm::CGFT_ObjectFile;
#else
- auto type = llvm::TargetMachine::CGFT_ObjectFile;
+ auto type = llvm::CGFT_ObjectFile;
#endif
if (target_machine_->addPassesToEmitFile(PM, stream, nullptr, type))
diff --git a/src/clang_parser.cpp b/src/clang_parser.cpp
index 8d79f076..52bb8786 100644
--- a/src/clang_parser.cpp
+++ b/src/clang_parser.cpp
@@ -86,102 +86,6 @@ static std::string get_clang_string(CXString string)
return str;
}
-/*
- * is_anonymous
- *
- * Determine whether the provided cursor points to an anonymous struct.
- *
- * This union is anonymous:
- * struct { int i; };
- * This is not, although it is marked as such in LLVM 8:
- * struct { int i; } obj;
- * This is not, and does not actually declare an instance of a struct:
- * struct X { int i; };
- *
- * The libclang API was changed in LLVM 8 and restored under a different
- * function in LLVM 9. For LLVM 8 there is no way to properly tell if
- * a record declaration is anonymous, so we do some hacks here.
- *
- * LLVM version differences:
- * https://reviews.llvm.org/D54996
- * https://reviews.llvm.org/D61232
- */
-static bool is_anonymous(CXCursor c)
-{
-#if LLVM_VERSION_MAJOR <= 7
- return clang_Cursor_isAnonymous(c);
-#elif LLVM_VERSION_MAJOR >= 9
- return clang_Cursor_isAnonymousRecordDecl(c);
-#else // LLVM 8
- if (!clang_Cursor_isAnonymous(c))
- return false;
-
- // In LLVM 8, some structs which the above function says are anonymous
- // are actually not. We iterate through the siblings of our struct
- // definition to see if there is a field giving it a name.
- //
- // struct Parent struct Parent
- // { {
- // struct struct
- // { {
- // ... ...
- // } name; };
- // int sibling; int sibling;
- // }; };
- //
- // Children of parent: Children of parent:
- // Struct: (cursor c) Struct: (cursor c)
- // Field: (Record)name Field: (int)sibling
- // Field: (int)sibling
- //
- // Record field found after No record field found after
- // cursor - not anonymous cursor - anonymous
-
- auto parent = clang_getCursorSemanticParent(c);
- if (clang_Cursor_isNull(parent))
- return false;
-
- struct AnonFinderState {
- CXCursor struct_to_check;
- bool is_anon;
- bool prev_was_definition;
- } state;
-
- state.struct_to_check = c;
- state.is_anon = true;
- state.prev_was_definition = false;
-
- clang_visitChildren(
- parent,
- [](CXCursor c2, CXCursor, CXClientData client_data) {
- auto state = static_cast<struct AnonFinderState *>(client_data);
- if (state->prev_was_definition) {
- // This is the next child after the definition of the struct we're
- // interested in. If it is a field containing a record, we assume
- // that it must be the field for our struct, so our struct is not
- // anonymous.
- state->prev_was_definition = false;
- auto kind = clang_getCursorKind(c2);
- auto type = clang_getCanonicalType(clang_getCursorType(c2));
- if (kind == CXCursor_FieldDecl && type.kind == CXType_Record) {
- state->is_anon = false;
- return CXChildVisit_Break;
- }
- }
-
- // We've found the definition of the struct we're interested in
- if (memcmp(c2.data,
- state->struct_to_check.data,
- 3 * sizeof(uintptr_t)) == 0)
- state->prev_was_definition = true;
- return CXChildVisit_Continue;
- },
- &state);
-
- return state.is_anon;
-#endif
-}
-
/*
* get_named_parent
*
@@ -192,7 +96,8 @@ static CXCursor get_named_parent(CXCursor c)
{
CXCursor parent = clang_getCursorSemanticParent(c);
- while (!clang_Cursor_isNull(parent) && is_anonymous(parent)) {
+ while (!clang_Cursor_isNull(parent) &&
+ clang_Cursor_isAnonymousRecordDecl(parent)) {
parent = clang_getCursorSemanticParent(parent);
}
diff --git a/tests/clang_parser.cpp b/tests/clang_parser.cpp
index acf07b19..db099fb4 100644
--- a/tests/clang_parser.cpp
+++ b/tests/clang_parser.cpp
@@ -208,13 +208,8 @@ TEST(clang_parser, nested_struct_no_type)
parse("struct Foo { struct { int x; } bar; union { int y; } baz; }",
bpftrace);
-#if LLVM_VERSION_MAJOR >= 13
std::string bar_name = "struct Foo::(unnamed at definitions.h:2:14)";
std::string baz_name = "union Foo::(unnamed at definitions.h:2:37)";
-#else
- std::string bar_name = "struct Foo::(anonymous at definitions.h:2:14)";
- std::string baz_name = "union Foo::(anonymous at definitions.h:2:37)";
-#endif
ASSERT_TRUE(bpftrace.structs.Has("struct Foo"));
ASSERT_TRUE(bpftrace.structs.Has(bar_name));
diff --git a/tests/data/CMakeLists.txt b/tests/data/CMakeLists.txt
index 7eaded22..caa4b397 100644
--- a/tests/data/CMakeLists.txt
+++ b/tests/data/CMakeLists.txt
@@ -11,17 +11,11 @@ find_program(AWK awk REQUIRED)
find_program(STRIP strip REQUIRED)
# Build data_source.o and inject BTF into it
-set(DATA_SOURCE_CFLAGS -g)
-if(LLVM_VERSION_MAJOR VERSION_LESS 13)
- # CI's GCC compile the testprogs using DWARF version 5
- # LLDB doesn't support DWARF5 before version 13, so we force DWARF4
- set(DATA_SOURCE_CFLAGS ${DATA_SOURCE_CFLAGS} -gdwarf-4)
-endif()
set(DATA_SOURCE_C ${CMAKE_CURRENT_SOURCE_DIR}/data_source.c)
set(DATA_SOURCE_O ${CMAKE_CURRENT_BINARY_DIR}/data_source.o)
add_custom_command(
OUTPUT ${DATA_SOURCE_O}
- COMMAND gcc ${DATA_SOURCE_CFLAGS} -o ${DATA_SOURCE_O} ${DATA_SOURCE_C}
+ COMMAND gcc -g -o ${DATA_SOURCE_O} ${DATA_SOURCE_C}
# pahole uses LLVM_OBJCOPY env var.
# We must hack it like this b/c cmake does not support setting env vars at build time
COMMAND bash -c "LLVM_OBJCOPY=${LLVM_OBJCOPY} pahole -J ${DATA_SOURCE_O}"
diff --git a/tests/testprogs/CMakeLists.txt b/tests/testprogs/CMakeLists.txt
index 58c17f7a..8f93658c 100644
--- a/tests/testprogs/CMakeLists.txt
+++ b/tests/testprogs/CMakeLists.txt
@@ -1,9 +1,4 @@
set(testprog_cflags "-g -O0 -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer")
-if(LLVM_VERSION_MAJOR VERSION_LESS 13)
- # CI's GCC compile the testprogs using DWARF version 5
- # LLDB doesn't support DWARF5 before version 13, so we force DWARF4
- set(testprog_cflags "${testprog_cflags} -gdwarf-4")
-endif()
file(GLOB testprog_sources CONFIGURE_DEPENDS *.c)
set(testprogtargets "")
--
2.47.1
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