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Add support for @ operator to PostfixEvaluator

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R=mark at http://breakpad.appspot.com/349002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@923 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2012-02-21 23:15:30 +00:00
parent 80bcce941e
commit f2e937f1cb
3 changed files with 17 additions and 6 deletions
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9
src/processor/postfix_evaluator-inl.h
View File

@ -83,7 +83,8 @@ bool PostfixEvaluator<ValueType>::EvaluateInternal(
BINARY_OP_SUBTRACT,
BINARY_OP_MULTIPLY,
BINARY_OP_DIVIDE_QUOTIENT,
BINARY_OP_DIVIDE_MODULUS
BINARY_OP_DIVIDE_MODULUS,
BINARY_OP_ALIGN
};
BinaryOperation operation = BINARY_OP_NONE;
@ -97,6 +98,8 @@ bool PostfixEvaluator<ValueType>::EvaluateInternal(
operation = BINARY_OP_DIVIDE_QUOTIENT;
else if (token == "%")
operation = BINARY_OP_DIVIDE_MODULUS;
else if (token == "@")
operation = BINARY_OP_ALIGN;
if (operation != BINARY_OP_NONE) {
// Get the operands.
@ -126,6 +129,10 @@ bool PostfixEvaluator<ValueType>::EvaluateInternal(
case BINARY_OP_DIVIDE_MODULUS:
result = operand1 % operand2;
break;
case BINARY_OP_ALIGN:
result =
operand1 & (reinterpret_cast<ValueType>(-1) ^ (operand2 - 1));
break;
case BINARY_OP_NONE:
// This will not happen, but compilers will want a default or
// BINARY_OP_NONE case.

10
src/processor/postfix_evaluator.h
View File

@ -44,10 +44,12 @@
// either literal values suitable for ValueType, or constants or variables,
// which reference the dictionary. The supported binary operators are +
// (addition), - (subtraction), * (multiplication), / (quotient of division),
// and % (modulus of division). The unary ^ (dereference) operator is also
// provided. These operators allow any operand to be either a literal
// value, constant, or variable. Assignment (=) of any type of operand into
// a variable is also supported.
// % (modulus of division), and @ (data alignment). The alignment operator (@)
// accepts a value and an alignment size, and produces a result that is a
// multiple of the alignment size by truncating the input value.
// The unary ^ (dereference) operator is also provided. These operators
// allow any operand to be either a literal value, constant, or variable.
// Assignment (=) of any type of operand into a variable is also supported.
//
// The dictionary is provided as a map with string keys. Keys beginning
// with the '$' character are treated as variables. All other keys are

4
src/processor/postfix_evaluator_unittest.cc
View File

@ -148,7 +148,8 @@ static bool RunTests() {
{ "$rSub 9 6 - =", true }, // $rSub = 9 - 6 = 3
{ "$rDivQ 9 6 / =", true }, // $rDivQ = 9 / 6 = 1
{ "$rDivM 9 6 % =", true }, // $rDivM = 9 % 6 = 3
{ "$rDeref 9 ^ =", true } // $rDeref = ^9 = 10 (FakeMemoryRegion)
{ "$rDeref 9 ^ =", true }, // $rDeref = ^9 = 10 (FakeMemoryRegion)
{ "$rAlign 36 8 @ =", true }, // $rAlign = 36 @ 8
};
map<string, unsigned int> validate_data_0;
validate_data_0["$rAdd"] = 8;
@ -158,6 +159,7 @@ static bool RunTests() {
validate_data_0["$rDivQ"] = 1;
validate_data_0["$rDivM"] = 3;
validate_data_0["$rDeref"] = 10;
validate_data_0["$rAlign"] = 32;
// The second test set simulates a couple of MSVC program strings.
// The data is fudged a little bit because the tests use FakeMemoryRegion