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a6c7bc9945
If users tried to have a structure decl/init code like below
struct test_t t = { .memeber1 = 45 };
It is very likely that compiler will generate a readonly section
to hold up the init values for variable t. Later load of t members,
e.g., t.member1 will result in a read from readonly section.
BPF program cannot handle relocation. This will force users to
write:
struct test_t t = {};
t.member1 = 45;
This is just inconvenient and unintuitive.
This patch addresses this issue by implementing BPF PreprocessISelDAG.
For any load from a global constant structure or an global array of
constant struct, it attempts to
translate it into a constant directly. The traversal of the
constant struct and other constant data structures are similar
to where the assembler emits read-only sections.
Four different unit test cases are also added to cover
different scenarios.
Signed-off-by: Yonghong Song <yhs@fb.com>
llvm-svn: 305560
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|---|---|---|
| .. | ||
| Disassembler | ||
| InstPrinter | ||
| MCTargetDesc | ||
| TargetInfo | ||
| BPF.h | ||
| BPF.td | ||
| BPFAsmPrinter.cpp | ||
| BPFCallingConv.td | ||
| BPFFrameLowering.cpp | ||
| BPFFrameLowering.h | ||
| BPFInstrFormats.td | ||
| BPFInstrInfo.cpp | ||
| BPFInstrInfo.h | ||
| BPFInstrInfo.td | ||
| BPFISelDAGToDAG.cpp | ||
| BPFISelLowering.cpp | ||
| BPFISelLowering.h | ||
| BPFMCInstLower.cpp | ||
| BPFMCInstLower.h | ||
| BPFRegisterInfo.cpp | ||
| BPFRegisterInfo.h | ||
| BPFRegisterInfo.td | ||
| BPFSubtarget.cpp | ||
| BPFSubtarget.h | ||
| BPFTargetMachine.cpp | ||
| BPFTargetMachine.h | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||