mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6609 91177308-0d34-0410-b5e6-96231b3b80d8
240 lines
10 KiB
C++
240 lines
10 KiB
C++
//===- MappingInfo.cpp - create LLVM info and output to .s file ---------===//
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//
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// This file contains a FunctionPass called getMappingInfoForFunction,
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// which creates two maps: one between LLVM Instructions and MachineInstrs,
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// and another between MachineBasicBlocks and MachineInstrs (the "BB TO
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// MI MAP").
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//
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// As a side effect, it outputs this information as .byte directives to
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// the assembly file. The output is designed to survive the SPARC assembler,
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// in order that the Reoptimizer may read it in from memory later when the
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// binary is loaded. Therefore, it may contain some hidden SPARC-architecture
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// dependencies. Currently this question is purely theoretical as the
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// Reoptimizer works only on the SPARC.
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//
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//===--------------------------------------------------------------------===//
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#include "llvm/Reoptimizer/Mapping/MappingInfo.h"
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineCodeForInstruction.h"
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#include <map>
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using std::vector;
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namespace {
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class getMappingInfoForFunction : public FunctionPass {
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std::ostream &Out;
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public:
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getMappingInfoForFunction(std::ostream &out) : Out(out){}
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const char* getPassName() const{return "Sparc MappingInformation";}
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bool runOnFunction(Function &FI);
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private:
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std::map<const Function*, unsigned> Fkey; //key of F to num
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std::map<const MachineInstr*, unsigned> BBkey; //key BB to num
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std::map<const MachineInstr*, unsigned> MIkey; //key MI to num
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void writePrologue(const std::string &comment,
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const std::string &symbolPrefix, unsigned num);
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void writeEpilogue(const std::string &symbolPrefix, unsigned num);
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bool doInitialization(Module &M);
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void create_BB_to_MInumber_Key(Function &FI);
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void create_MI_to_number_Key(Function &FI);
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void writeBBToMImap(Function &FI, unsigned num);
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void writeLLVMToMImap(Function &FI, unsigned num);
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void writeNumber(unsigned X);
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};
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}
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/// MappingInfoForFunction -- Static factory method: returns a new
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/// getMappingInfoForFunction Pass object, which uses OUT as its
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/// output stream for assembly output.
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Pass *MappingInfoForFunction(std::ostream &out){
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return (new getMappingInfoForFunction(out));
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}
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/// runOnFunction -- Builds up the maps for the given function FI and then
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/// writes them out as assembly code to the current output stream OUT.
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/// This is an entry point to the pass, called by the PassManager.
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bool getMappingInfoForFunction::runOnFunction(Function &FI) {
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// First we build temporary tables used to write out the maps.
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create_BB_to_MInumber_Key(FI);
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create_MI_to_number_Key(FI);
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unsigned num = Fkey[&FI]; // Function number for the current function.
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// Now, write out the maps.
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writeBBToMImap(FI, num);
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writeLLVMToMImap(FI, num);
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return false;
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}
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/// writePrologue -- Output a COMMENT describing the map, then output a
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/// global symbol to start the map named by concatenating SYMBOLPREFIX
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/// and NUM, then output a word containing the length of the map, to the
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/// current output stream Out. This also switches the current section to
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/// .rodata in the assembly output.
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void getMappingInfoForFunction::writePrologue(const std::string &comment,
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const std::string &symbolPrefix,
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unsigned num) {
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// Comment:
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Out << "!" << comment << "\n";
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// Switch sections:
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Out << "\t.section \".rodata\"\n\t.align 8\n";
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// Global symbol naming the map:
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Out << "\t.global " << symbolPrefix << num << "\n";
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Out << "\t.type " << symbolPrefix << num << ",#object\n";
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Out << symbolPrefix << num << ":\n";
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// Length word:
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Out << "\t.word .end_" << symbolPrefix << num << "-"
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<< symbolPrefix << num << "\n";
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}
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/// writeEpilogue -- Outputs a local symbol to end the map named by
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/// concatenating SYMBOLPREFIX and NUM, followed by a .size directive that
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/// gives the size of the map, to the current output stream Out.
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void getMappingInfoForFunction::writeEpilogue(const std::string &symbolPrefix,
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unsigned num) {
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// Local symbol ending the map:
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Out << ".end_" << symbolPrefix << num << ":\n";
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// Size directive:
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Out << "\t.size " << symbolPrefix << num << ", .end_"
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<< symbolPrefix << num << "-" << symbolPrefix
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<< num << "\n\n\n\n";
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}
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/// outByte -- NOT DONE YET.
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void outByte (unsigned char b) {
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Out << "\t.byte " << tmp << "\n";
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}
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/// writeNumber -- Write out the number X as a sequence of .byte
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/// directives to the current output stream Out. This method performs a
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/// run-length encoding of the unsigned integers X that are output.
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void getMappingInfoForFunction::writeNumber(unsigned X) {
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unsigned i=0;
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do {
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unsigned tmp = X & 127;
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X >>= 7;
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if (X) tmp |= 128;
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outByte (tmp);
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++i;
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} while(X);
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}
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/// doInitialization -- Assign a number to each Function, as follows:
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/// Functions are numbered starting at 0 at the begin() of each Module.
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/// Functions which are External (and thus have 0 basic blocks) are not
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/// inserted into the maps, and are not assigned a number. The side-effect
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/// of this method is to fill in Fkey to contain the mapping from Functions
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/// to numbers. (This method is called automatically by the PassManager.)
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bool getMappingInfoForFunction::doInitialization(Module &M) {
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unsigned i = 0;
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for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI) {
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if (FI->isExternal()) continue;
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Fkey[FI] = i;
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++i;
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}
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return false;
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}
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/// create_BB_to_MInumber_Key -- Assign a number to each MachineBasicBlock
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/// in the given Function, as follows: Numbering starts at zero in each
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/// Function. MachineBasicBlocks are numbered from begin() to end()
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/// in the Function's corresponding MachineFunction. Each successive
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/// MachineBasicBlock increments the numbering by the number of instructions
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/// it contains. The side-effect of this method is to fill in the instance
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/// variable BBkey with the mapping of MachineBasicBlocks to numbers. BBkey
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/// is keyed on MachineInstrs, so each MachineBasicBlock is represented
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/// therein by its first MachineInstr.
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void getMappingInfoForFunction::create_BB_to_MInumber_Key(Function &FI) {
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unsigned i = 0;
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MachineFunction &MF = MachineFunction::get(&FI);
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for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
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BI != BE; ++BI) {
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MachineBasicBlock &miBB = *BI;
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BBkey[miBB[0]] = i;
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i = i+(miBB.size());
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}
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}
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/// create_MI_to_number_Key -- Assign a number to each MachineInstr
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/// in the given Function with respect to its enclosing MachineBasicBlock, as
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/// follows: Numberings start at 0 in each MachineBasicBlock. MachineInstrs
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/// are numbered from begin() to end() in their MachineBasicBlock. Each
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/// MachineInstr is numbered, then the numbering is incremented by 1. The
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/// side-effect of this method is to fill in the instance variable MIkey
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/// with the mapping from MachineInstrs to numbers.
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void getMappingInfoForFunction::create_MI_to_number_Key(Function &FI) {
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MachineFunction &MF = MachineFunction::get(&FI);
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for (MachineFunction::iterator BI=MF.begin(), BE=MF.end(); BI != BE; ++BI) {
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MachineBasicBlock &miBB = *BI;
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unsigned j = 0;
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for(MachineBasicBlock::iterator miI=miBB.begin(), miE=miBB.end();
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miI!=miE; ++miI, ++j) {
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MIkey[*miI]=j;
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}
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}
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}
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/// writeBBToMImap -- Output the BB TO MI MAP for the given function as
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/// assembly code to the current output stream. The BB TO MI MAP consists
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/// of a three-element tuple for each MachineBasicBlock in a function:
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/// first, the index of the MachineBasicBlock in the function; second,
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/// the number of the MachineBasicBlock in the function as computed by
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/// create_BB_to_MInumber_Key; and third, the number of MachineInstrs in
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/// the MachineBasicBlock.
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void getMappingInfoForFunction::writeBBToMImap(Function &FI, unsigned num){
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unsigned bb = 0;
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const std::string MapComment = "BB TO MI MAP";
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const std::string MapSymbolPrefix = "BBMIMap";
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writePrologue(MapComment, MapSymbolPrefix, num);
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MachineFunction &MF = MachineFunction::get(&FI);
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for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
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BI != BE; ++BI, ++bb) {
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MachineBasicBlock &miBB = *BI;
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writeNumber(bb);
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writeNumber(BBkey[miBB[0]]);
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writeNumber(miBB.size());
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}
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writeEpilogue(MapSymbolPrefix, num);
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}
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/// writeLLVMToMImap -- Output the LLVM I TO MI MAP for the given function
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/// as assembly code to the current output stream. The LLVM I TO MI MAP
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/// consists of a set of information for each BasicBlock in a Function,
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/// ordered from begin() to end(). The information for a BasicBlock consists
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/// of 1) its (0-based) index in the Function, 2) the number of LLVM
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/// Instructions it contains, and 3) information for each Instruction, in
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/// sequence from the begin() to the end() of the BasicBlock. The information
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/// for an Instruction consists of 1) its (0-based) index in the BasicBlock,
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/// 2) the number of MachineInstrs that correspond to that Instruction
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/// (as reported by MachineCodeForInstruction), and 3) the MachineInstr
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/// number calculated by create_MI_to_number_Key, for each of the
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/// MachineInstrs that correspond to that Instruction.
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void getMappingInfoForFunction::writeLLVMToMImap(Function &FI, unsigned num) {
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unsigned bb = 0;
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const std::string MapComment = "LLVM I TO MI MAP";
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const std::string MapSymbolPrefix = "LMIMap";
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writePrologue(MapComment, MapSymbolPrefix, num);
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for (Function::iterator BI = FI.begin(), BE = FI.end();
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BI != BE; ++BI, ++bb) {
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unsigned li = 0;
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writeNumber(bb);
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writeNumber(BI->size());
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for (BasicBlock::iterator II = BI->begin(), IE = BI->end(); II != IE;
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++II, ++li) {
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MachineCodeForInstruction& miI = MachineCodeForInstruction::get(II);
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writeNumber(li);
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writeNumber(miI.size());
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for (MachineCodeForInstruction::iterator miII = miI.begin(),
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miIE = miI.end(); miII != miIE; ++miII) {
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writeNumber(MIkey[*miII]);
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}
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}
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}
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writeEpilogue(MapSymbolPrefix, num);
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}
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