Java Code Examples for com.sun.org.apache.bcel.internal.Constants#JSR_W

The following examples show how to use com.sun.org.apache.bcel.internal.Constants#JSR_W . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: InstructionFactory.java    From jdk1.8-source-analysis with Apache License 2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 2
Source File: InstructionFactory.java    From openjdk-8 with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 3
Source File: InstructionFactory.java    From openjdk-8-source with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 4
Source File: InstructionFactory.java    From hottub with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 5
Source File: InstructionFactory.java    From openjdk-jdk9 with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 6
Source File: InstructionFactory.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 7
Source File: InstructionFactory.java    From openjdk-jdk8u with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 8
Source File: InstructionFactory.java    From JDKSourceCode1.8 with MIT License 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 9
Source File: InstructionFactory.java    From jdk8u60 with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 10
Source File: InstructionFactory.java    From TencentKona-8 with GNU General Public License v2.0 5 votes vote down vote up 
/** Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
 * For those you should use the SWITCH compound instruction.
 */
public static BranchInstruction createBranchInstruction(short opcode, InstructionHandle target) {
  switch(opcode) {
  case Constants.IFEQ:      return new IFEQ(target);
  case Constants.IFNE:      return new IFNE(target);
  case Constants.IFLT:      return new IFLT(target);
  case Constants.IFGE:      return new IFGE(target);
  case Constants.IFGT:      return new IFGT(target);
  case Constants.IFLE:      return new IFLE(target);
  case Constants.IF_ICMPEQ: return new IF_ICMPEQ(target);
  case Constants.IF_ICMPNE: return new IF_ICMPNE(target);
  case Constants.IF_ICMPLT: return new IF_ICMPLT(target);
  case Constants.IF_ICMPGE: return new IF_ICMPGE(target);
  case Constants.IF_ICMPGT: return new IF_ICMPGT(target);
  case Constants.IF_ICMPLE: return new IF_ICMPLE(target);
  case Constants.IF_ACMPEQ: return new IF_ACMPEQ(target);
  case Constants.IF_ACMPNE: return new IF_ACMPNE(target);
  case Constants.GOTO:      return new GOTO(target);
  case Constants.JSR:       return new JSR(target);
  case Constants.IFNULL:    return new IFNULL(target);
  case Constants.IFNONNULL: return new IFNONNULL(target);
  case Constants.GOTO_W:    return new GOTO_W(target);
  case Constants.JSR_W:     return new JSR_W(target);
  default:
      throw new RuntimeException("Invalid opcode: " + opcode);
  }
}
Example 11
Source File: MethodGen.java    From openjdk-jdk8u with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 12
Source File: MethodGen.java    From JDKSourceCode1.8 with MIT License 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 13
Source File: MethodGen.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 14
Source File: MethodGen.java    From openjdk-jdk9 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 15
Source File: MethodGen.java    From jdk8u60 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 16
Source File: MethodGen.java    From hottub with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 17
Source File: MethodGen.java    From openjdk-8-source with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 18
Source File: MethodGen.java    From TencentKona-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 19
Source File: MethodGen.java    From openjdk-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}
Example 20
Source File: MethodGen.java    From jdk1.8-source-analysis with Apache License 2.0 4 votes vote down vote up 
/**
 * Computes stack usage of an instruction list by performing control flow analysis.
 *
 * @return maximum stack depth used by method
 */
public static int getMaxStack(ConstantPoolGen cp, InstructionList il, CodeExceptionGen[] et) {
  BranchStack branchTargets = new BranchStack();

  /* Initially, populate the branch stack with the exception
   * handlers, because these aren't (necessarily) branched to
   * explicitly. in each case, the stack will have depth 1,
   * containing the exception object.
   */
  for (int i = 0; i < et.length; i++) {
    InstructionHandle handler_pc = et[i].getHandlerPC();
    if (handler_pc != null)
      branchTargets.push(handler_pc, 1);
  }

  int               stackDepth = 0, maxStackDepth = 0;
  InstructionHandle ih         = il.getStart();

  while(ih != null) {
    Instruction instruction = ih.getInstruction();
    short opcode = instruction.getOpcode();
    int delta = instruction.produceStack(cp) - instruction.consumeStack(cp);

    stackDepth += delta;
    if(stackDepth > maxStackDepth)
      maxStackDepth = stackDepth;

    // choose the next instruction based on whether current is a branch.
    if(instruction instanceof BranchInstruction) {
      BranchInstruction branch = (BranchInstruction) instruction;
      if(instruction instanceof Select) {
        // explore all of the select's targets. the default target is handled below.
        Select select = (Select) branch;
        InstructionHandle[] targets = select.getTargets();
        for (int i = 0; i < targets.length; i++)
          branchTargets.push(targets[i], stackDepth);
        // nothing to fall through to.
        ih = null;
      } else if(!(branch instanceof IfInstruction)) {
        // if an instruction that comes back to following PC,
        // push next instruction, with stack depth reduced by 1.
        if(opcode == Constants.JSR || opcode == Constants.JSR_W)
          branchTargets.push(ih.getNext(), stackDepth - 1);
        ih = null;
      }
      // for all branches, the target of the branch is pushed on the branch stack.
      // conditional branches have a fall through case, selects don't, and
      // jsr/jsr_w return to the next instruction.
      branchTargets.push(branch.getTarget(), stackDepth);
    } else {
      // check for instructions that terminate the method.
      if(opcode == Constants.ATHROW || opcode == Constants.RET ||
         (opcode >= Constants.IRETURN && opcode <= Constants.RETURN))
        ih = null;
    }
    // normal case, go to the next instruction.
    if(ih != null)
      ih = ih.getNext();
    // if we have no more instructions, see if there are any deferred branches to explore.
    if(ih == null) {
      BranchTarget bt = branchTargets.pop();
      if (bt != null) {
        ih = bt.target;
        stackDepth = bt.stackDepth;
      }
    }
  }

  return maxStackDepth;
}