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Breakpad processor: Support evaluating a postfix expression to produce a value.

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This adds an EvaluateForValue member function to PostfixEvaluator, and
along with appropriate unit tests.

a=jimblandy, r=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@511 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy 2010-02-05 17:51:35 +00:00
parent 6a9ffff696
commit 89e07bf2c7
3 changed files with 151 additions and 14 deletions
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28
src/processor/postfix_evaluator.h
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@ -1,3 +1,5 @@
// -*- mode: C++ -*-
// Copyright (c) 2010, Google Inc.
// All rights reserved.
//
@ -93,15 +95,21 @@ class PostfixEvaluator {
PostfixEvaluator(DictionaryType *dictionary, const MemoryRegion *memory)
: dictionary_(dictionary), memory_(memory), stack_() {}
// Evaluate the expression. The results of execution will be stored
// in one (or more) variables in the dictionary. Returns false if any
// failures occure during execution, leaving variables in the dictionary
// in an indeterminate state. If assigned is non-NULL, any keys set in
// the dictionary as a result of evaluation will also be set to true in
// assigned, providing a way to determine if an expression modifies any
// of its input variables.
// Evaluate the expression, starting with an empty stack. The results of
// execution will be stored in one (or more) variables in the dictionary.
// Returns false if any failures occur during execution, leaving
// variables in the dictionary in an indeterminate state. If assigned is
// non-NULL, any keys set in the dictionary as a result of evaluation
// will also be set to true in assigned, providing a way to determine if
// an expression modifies any of its input variables.
bool Evaluate(const string &expression, DictionaryValidityType *assigned);
// Like Evaluate, but provides the value left on the stack to the
// caller. If evaluation succeeds and leaves exactly one value on
// the stack, pop that value, store it in *result, and return true.
// Otherwise, return false.
bool EvaluateForValue(const string &expression, ValueType *result);
DictionaryType* dictionary() const { return dictionary_; }
// Reset the dictionary. PostfixEvaluator does not take ownership.
@ -137,6 +145,12 @@ class PostfixEvaluator {
// Pushes a new value onto the stack.
void PushValue(const ValueType &value);
// Evaluate expression, updating *assigned if it is non-zero. Return
// true if evaluation completes successfully. Do not clear the stack
// upon successful evaluation.
bool EvaluateInternal(const string &expression,
DictionaryValidityType *assigned);
// The dictionary mapping constant and variable identifiers (strings) to
// values. Keys beginning with '$' are treated as variable names, and
// PostfixEvaluator is free to create and modify these keys. Weak pointer.